CN101498121A - Perforated metal plate for dustproof fence, and dustproof fence using the same - Google Patents

Abstract

The perforated metal plate for the dustproof grille and the dustproof grille seek the harmony between the shielding rate required for the dustproof function and the effective opening ratio for reducing the wind pressure (wind load) effect, and at the same time, study the opening The size, arrangement, and shape of the gate are reduced as much as possible to reduce the thickness of the grid plate to reduce weight and save material costs. At the same time, it is easy to open holes (shearing processing by a punching machine). A perforated metal plate for a dustproof grille, the cross-section of which is composed of a flat portion formed on the upper and lower sides, a protruding flat portion protruding to one side in the horizontal direction at the middle portion of the above-mentioned flat portion, and a flat portion connecting the flat portion and the middle portion. The inclined surface of the protruding flat part of the part is formed in the shape of a mountain, and it is a long metal plate in the left and right directions. Many round holes and long holes are arranged in regular rows in the up and down, left and right directions on almost the entire surface, and the aperture ratio is set. 20% to 40%.

Description

Perforated metal plate for dust-proof grille and dust-proof grille using it

technical field

The present invention belongs to the technical field of dust-proof grille, for example described dust-proof grille is used to prevent as much as possible in the strong wind that blows to dry clay or sandy belt, or wide coal storage yard due to soil particle, coal dust , dust, etc. are involved in the air and scattered with the wind to deteriorate the surrounding living and ecological environment, and more specifically, it relates to a perforated metal plate for dust-proof grilles with excellent dust-proof effects and the use of this perforated metal plate A dustproof grille constructed of a perforated metal plate (however, it can also function as a windproof grille or a snowproof grille, hereinafter, it will be used as a term with the same meaning).

Background technique

As everyone knows, if strong wind blows to dry sandy soil or clay zone or vast coal storage yard, then fine sand grain or earth dust, coal dust, dust etc. are involved in the air and fly together with wind and make The surrounding living environment and ecological environment have deteriorated, and up to now, some fences have been installed for the purpose of windproof or dustproof.

Regarding the dustproof fence, it is considered important to reduce the wind force (wind load) acting on the fence, that is, to ensure the so-called wind reduction performance, within the limit of not impairing the dustproof (including windproof, snowproof, the same below) effect, for this reason Aiming at this, a perforated metal plate in which openings (holes) are provided on the entire surface at a constant opening ratio is often used as a plate material for a grid. The above-mentioned aperture ratio has been often set at 10% to 50% in the past.

[0003] As the prior art about the dustproof grid and its grid plate (perforated metal plate), a windproof and dustproof panel is disclosed in the following patent document 1: the aluminum alloy with relatively large plate thickness On flat materials such as plates and steel plates (for example, an aluminum alloy flat plate with a thickness of 4mm), the small-diameter holes (round holes) are set to an area ratio of 5% to 30% or less.

In addition, Patent Document 2 discloses a windproof and dustproof board, which is provided with round holes, oval holes, or triangles, quadrangles, octagons, rhombuses, etc. according to the opening ratio of 30% to 50%. A windproof and dustproof board that bends a steel plate with a hole in the shape of a mountain in the up and down direction. Also in Patent Documents 3 and 4, windproof and dustproof panels having the same structure are disclosed.

In patent document 5, disclose a kind of wall use or dustproof (sandproof) with fence, it has used steel plate to be bent into the sinusoidal shape in the direction of the distance between pillars at the same time in the direction of corrugated slit shape The holes are formed in long panels.

Patent Document 6 discloses a grid plate for fences, which has a structure of punching a hole in a flat steel plate or the like, and retains an inclined cut-out piece on the inner side of the punched hole.

[0005]

Patent Document 1: Japanese Patent Application Laid-Open No. 3-63307

Patent Document 2: Japanese Utility Model Publication No. 61-45413

Patent Document 3: Japanese Publication No. 55-50299

Patent Document 4: Japanese Patent Application Laid-Open No. 3-137306

Patent Document 5: Japanese Patent Laid-Open No. 2002-89086

Patent Document 6: Japanese Patent Laid-Open No. 2004-68581

Contents of the invention

The problem to be solved by the invention

[0006] The perforated metal plate used for the grid plate of the dustproof grille is firstly required to not impair the shielding rate and shielding function of the originally intended dustproof function, but on the other hand, it is also required to reduce the effect of wind pressure. Wind reduction performance. The harmony between the shielding ratio required for the dustproof function and the aperture ratio required for the wind reduction performance is generally considered to be an aperture ratio of 10% to 50%.

In order to prevent dispersion due to wind, as a grid plate material of the dustproof grid, an appropriate initial tension is generally introduced in the spacing direction of the grid pillars, and the installation and fixation to the pillars is carried out under this tension state.

Furthermore, since tension due to wind pressure acts on the grid plate material in addition to the above-mentioned initial tension, the perforated metal plate is required to have strength and rigidity capable of withstanding the sum of the above-mentioned tensions as a basic performance. As one of the measures to meet the above basic performance requirements, it is also known to use a perforated metal plate bent into a mountain shape to increase the section coefficient, as described in Patent Documents 2, 3, and 4 above.

[0007] However, the above-mentioned two kinds of tensile forces acting on the grid plate of the dustproof grid mainly act on the spacing direction (left-right direction) of the grid pillars. Therefore, the grid plate material of the dustproof grid is required to have the strength and rigidity to withstand the tensile force caused by the wind load even if it reaches the above-mentioned opening ratio.

Therefore, conventionally, as a countermeasure against the above-mentioned requirements, it has been generally practiced to design and manufacture the sheet material for the dustproof grille sufficiently thick as required.

[0008] However, if the thickness of the plate for the dustproof grille is increased, the weight of the plate will of course increase proportionally, so that installation is inconvenient and the cost of materials increases, resulting in an expensive structure. Furthermore, in proportion to the thickness of the plate, drilling (shearing, usually by punching) becomes difficult, and obviously there are uneconomical problems and disadvantages such as requiring a relatively large and high-power punching machine.

Therefore, the object of the present invention is to provide a kind of perforated metal plate for dust-proof grid, and provide a kind of dust-proof grid using this perforated metal plate, the perforated metal plate for said dust-proof grid To achieve harmony between the shielding rate required for the dustproof function and the effective opening rate for reducing the wind pressure (wind load), and at the same time, study the size, arrangement, and shape of the openings to minimize the grille. By using the thickness of the plate material, weight reduction and material cost saving are achieved, and easy drilling (shearing processing by punching) is realized.

Another object of the present invention is to provide a perforated metal plate for a dust-proof grille, and to provide a dust-proof grille using the perforated metal plate. Thick and thin pre-coating materials represented by hot-dip galvanized steel sheets rely on the so-called sacrificial anti-corrosion effect of zinc to prevent the edge (shear surface) of the hole from rusting, so post-treatment after hole drilling is not required, and it has Excellent durable life.

means to solve the problem

As a means to solve the above-mentioned existing technical problems, the perforated metal plate for the dust-proof grille of the invention described in the technical solution 1 is characterized in that the perforated metal plate for the dust-proof grille has a cross section The flat part formed on the upper and lower sides, the protruding flat part protruding to one side in the horizontal direction at the middle part of the above-mentioned upper and lower flat parts, and the inclined surface connecting the above-mentioned upper and lower flat part and the protruding flat part at the middle part are formed into a mountain shape. , and the perforated metal plate for the dustproof grille is a long metal plate in the left and right directions, and many round holes and long holes are arranged in regular rows in the up, down, left and right directions on substantially the entire surface, and the opening ratio is set to 20. %~40%.

The invention described in claim 2 is, in the perforated metal plate for the dustproof grille described in claim 1, characterized in that the upper and lower flat parts of the perforated metal plate, the protruding flat part at the middle part, and the entire inclined surface On the surface, or on the entire surface except the upper and lower flat parts, or only on the inclined surface except the upper and lower flat parts and the protruding flat parts, many round holes and long holes are arranged in regular rows in the up, down, left, and right directions. It is set at 20% to 40%, and furthermore, mounting holes for mounting to the grid post are formed at both ends in the left-right direction of the upper and lower flat portions.

The invention described in technical solution 3 is that in the perforated metal plate for the dustproof grille described in technical solution 1 or 2, it is characterized in that the diameter of the round hole of the perforated metal plate is 3 mm to 9 mm in size , the long hole is an oblong hole with semicircular ends. The length of the opening of the long hole is about 8 mm to 15 mm in the long side direction, and the size in the short side direction is about 3 mm to 5 mm. Combining the above round holes and oblong holes, The aperture ratio is set at 20% to 40%.

The invention described in claim 4 is, in the perforated metal plate for dustproof grilles described in any one of claims 1 to 3, characterized in that the perforated metal plate is fused Zn-Al-Mg-Si The pre-coating material of the alloy, the molten Zn-Al-Mg-Si alloy has 3-20wt% of Al, 0.1-10wt% of Mg, 0.01-2wt% of Si, Zn of the remainder and inevitable coatings made of impurities.

The dustproof grille of the invention described in technical solution 5 is characterized in that the perforated metal plate of the following structure is erected in the horizontal direction between the pillars erected by fixing the lower end on the foundation, the perforated metal plate The two ends of the metal plate are installed and fixed on the pillars. The structure of the perforated metal plate is: the cross section of the perforated metal plate is composed of a flat part formed up and down, and a horizontal direction in the middle part of the above-mentioned up and down flat part. The protruding flat part protruding from one side and the inclined surface connecting the above-mentioned upper and lower flat parts and the protruding flat part in the middle are formed in the shape of a mountain, and the perforated metal plate for the dustproof grille is a long metal plate in the left and right direction, A large number of circular holes and long holes are arranged in regular rows in the up, down, left, and right directions on almost the entire surface, and the opening ratio is set at 20% to 40%.

The invention that technical scheme 6 records is, in the dust-proof grille that technical scheme 5 records, it is characterized in that, the caliber of the circular hole of perforated metal plate is the size below 3mm more than 9mm, and long hole is that both ends are semicircle The length of the opening of the long hole is about 8 mm to 15 mm, and the size of the short side is about 3 mm to 5 mm. Combining the above round hole and the oblong hole, the opening ratio is set to 20%. ~ 40%, the perforated metal plate is the pre-coating material of the molten Zn-Al-Mg-Si alloy, and the molten Zn-Al-Mg-Si alloy has 3 ~ 20wt% of Al and Mg of 0.1-10wt%, Si 0.01-2wt%, and the remainder Zn and unavoidable impurities.

The invention described in technical solution 7 is that in the dustproof grille described in technical solution 5 or 6, it is characterized in that the perforated metal plate is installed on On the grid pillar, on the entire surface of the upper and lower flat parts and the protruding flat part and the inclined part in the middle part, or on the entire surface except the upper and lower flat parts, or only on the inclined part except the upper and lower flat parts and the protruding flat part Above, many round holes and long holes are combined, and the opening ratio is set at 20% to 40%.

The invention described in claim 8 is, in the dustproof grille described in claim 7 , characterized in that the perforated metal plates adjacent to the upper and lower sides of the grid support are attached to the grid support by aligning the respective flat parts, Alternatively, the flat parts are overlapped and attached to the grid support, and the overlapping flat parts are connected by aligning holes formed in the flat parts and passing width fixing parts through the holes.

The dust-proof grille of the invention described in technical scheme 9 is characterized in that, the dust-proof grille constructed as follows is spaced below 20 times the effective height of the dust-proof grille on the ground and substantially parallel Arranged in multiple rows, the construction of the dustproof grid is to install and fix the two ends of the perforated metal plate by erecting the perforated metal plate between the adjacent grid pillars in the horizontal direction. The dustproof grid described in the above-mentioned claims 5 to 8 constructed on the grid support.

The effect of the invention

For the perforated metal plate for the dust-proof grille recorded in technical solutions 1-4, in order to meet the required shielding rate and shielding function of the dust-proof function, the aperture ratio is firstly limited to 20%-40%. The results of the experiment show that if the aperture ratio is configured at 40% or more, most of the wind and dust will pass through, and the shielding function and shielding effect required for the dustproof function are not sufficient, and it is difficult to expect the dustproof function. On the contrary, if the aperture ratio If the structure is less than 20%, the shielding rate and shielding function will be too high, and the wind pressure (wind load) reduction effect (wind reduction performance) will be poor. The pressure difference between the circuitous airflows above the dust grid becomes too large, the wind reduction area formed on the inner side of the dust grid becomes smaller, and the dust prevention effect is weakened. Moreover, in the structural surface of the dustproof grille, because of the effect of bearing a large wind load, it is required to increase the thickness of the perforated metal plate, increase the cross section of the grille pillar, etc. from the standpoint of the endurance structure, which is also uneconomical and It is not suitable, so it is concluded that the above-mentioned aperture ratio of 20% to 40% is appropriate. As a result, the perforated metal sheet of the present invention can reduce its thickness and weight, and is easy to handle. In addition, the perforation process is easy. As will be described later, if a pre-coated material is used, it is also beneficial to the so-called sacrificial anti-corrosion effect of zinc. Structure.

[0017] The perforated metal plate for the dustproof grille described in technical proposals 1 to 4 not only limits the opening ratio to the above-mentioned 20% to 40% as the shielding ratio and shielding function required to satisfy the dustproof function, but also in order to improve With respect to the strength and rigidity of the wind load, the above-mentioned upper and lower flat parts and the middle part are connected linearly by the flat part formed on the upper and lower sides and the protruding flat part protruding to one side in the horizontal direction at the middle part of the above-mentioned upper and lower flat part. The inclined surface of the protruding flat part makes the cross section into a mountain shape, so the section modulus can be increased. In this sense, the thickness of the perforated metal plate can also be reduced, which contributes to weight reduction and ease of perforation processing. .

Moreover, the present invention does not simply limit the aperture ratio to 20% to 40%, but also combines many circular holes and long holes to achieve the above aperture ratio. In particular, the diameter of the above-mentioned circular hole is taken as a size between 3 mm and 9 mm, and the long hole is a long hole with semicircular ends at both ends. The direction size is about 3mm to 5mm, so not only the shielding rate and shielding function required for the dustproof function can be satisfied, but also the wind pressure (wind load) reduction effect (wind reduction performance) can be satisfied.

Its reason is, because if simply implement the perforated metal plate with aperture rate 20%～40% with the oblong hole that only forms large opening, then each opening is all big, so included in strong wind Fine particles of coal dust and dust have a high probability of passing through, and it is difficult to obtain a desired dust-proof effect. On the contrary, if the perforated metal plate with the above-mentioned opening ratio of 20% to 40% is implemented only with the small circular holes of the opening, the number of circular holes per unit area will increase, and the perforated metal plate will become a mesh structure of holes as a whole. It is difficult to secure strength and rigidity required for the wind load described above.

The perforated metal plate of the present invention achieves the above-mentioned opening ratio of 20% to 40% due to the appropriate combination of many round holes and long holes, so it can not only meet the shielding rate and shielding function required by the dustproof function, but also can be well To secure strength and rigidity against wind loads.

Even with an appropriate combination of many round holes and long holes, the diameter of the round holes is preferably not less than 3 mm and not more than 9 mm. This is because if the hole diameter is formed below 3mm, the number of holes per unit area will be too many, and the perforated metal plate will indeed become a mesh structure. On the contrary, if the hole diameter is formed above 9mm, then The amount of wind, coal dust, and dust passing through increases, and it is difficult to realize the shielding rate and shielding function required by the dustproof function.

Based on the same considerations as above, the long hole is selected as a semicircular long hole that is not prone to stress concentration at both ends and is advantageous in strength, and the size of the opening is about 8mm to 15mm in the long side direction The dimension in the side direction is about 3 mm to 5 mm. This is because it is difficult to achieve the shielding rate and shielding function required for the dustproof function with a larger oblong hole than the above, and on the contrary, it is difficult to achieve the above 20% to 40% opening if the oblong hole is combined with a round hole smaller than the above. Rate.

The perforated metal sheet of the present invention is implemented by using a pre-coated material represented by a hot-dip galvanized steel sheet, relying on the so-called sacrificial anti-corrosion effect of zinc, which can prevent the edge of the hole (shear section) that has been perforated from being damaged. The occurrence of rust. Therefore, post-treatment after drilling is not required, so it has an excellent anti-rust effect and durable life even when exposed to strong winds under severe temperature and weather conditions.

Next, the dust-proof grid described in technical proposals 5 to 9 uses the perforated metal plate of the above-mentioned structure, so it can well exert the shielding rate and shielding function required for the dustproof function, and because it is light and has excellent Excellent anti-rust effect and wind-resistant strength, so it can exert excellent dust-proof function and durable life as a dust-proof grille.

In particular, the dust-proof grille described in claim 9 is arranged in a plurality of rows substantially in parallel with an interval L of 20 times or less the effective height above the ground of the dust-proof grille on a vast land or a coal storage area where strong wind blows. Therefore, according to the results of the wind tunnel experiment, the initial wind speed V0 of the wind blowing from the left to the right in Fig. 10 passes through the dust grid F1 at a decelerated wind speed V1 in front of the first dust grid F1, and On the one hand, the airflow detoured above the dustproof grid F1 is accelerated (wind speed V2) near the dustproof grid F1, and then the airflow is drawn into the ground on the right (downwind) of the dustproof grid F1 One side creates a wind-reducing area. The ratio (V1/V0) of the wind speed V1 passing through the dust grid F1 to the initial wind speed V0 is called the wind reduction rate. It is known that the distance L that produces a wind reduction rate of 50% is the effective height K above the ground of the dust grid F1 If the wind reduction rate is less than 50%, the dust and coal dust on the ground will not be scattered, and the effect as a dust-proof grille can be exerted.

And if the second dust grille F2 on the leeward side (the right side of FIG. 10 ) exists, the wind speed V1 of the airflow passing through the dust grille F1 on the windward side is decelerated even in front of the dust grille F2 and divided into straight lines. The passing airflow (wind speed V1') and the airflow that detours above the dust-proof grill F2 are accelerated (wind speed V2') near the dust-proof grille F2, and then, likewise , the airflow is drawn into the right (downwind) ground side of the second dustproof grill F2 to generate a wind reduction area. The scattered dust and the like caught in this wind fall to the ground at a reduced speed. That is, the first and second dustproof grilles F1 and F2 capture coal dust and earth dust in the wind reduction regions where the wind reduction ratios of the first and second dustproof grilles F1 and F2 are 50% or less, respectively, thereby exhibiting the dustproof effect. And if the dustproof grille is further provided in a plurality of rows with the above-mentioned interval L, the capture of soot and dust will be repeated in the same manner.

Description of drawings

[0036]

(A) in FIG. 1 is a front view showing an example of a perforated metal plate according to the present invention with a part omitted, and (B) is a side view.

Fig. 2 is an enlarged side view of the perforated metal plate of Fig. 1 .

(A) in FIG. 3 is a front view showing still another Example of the perforated metal plate of this invention with a part omitted, (B) is a side view.

(A) in FIG. 4 is a front view showing an example of the perforated metal plate according to the present invention with a part omitted, and (B) is a side view.

Fig. 5 is a perspective view schematically showing a dustproof grill according to the present invention.

FIG. 6 is a sectional view of VI-VI in FIG. 5 .

FIG. 7 is an enlarged view of a circle VII portion in FIG. 6 .

FIG. 8 is a VIII-VIII sectional view of FIG. 7 .

(A) in FIG. 9 is a figure which shows the connection state of flat parts mutually, (B) is a top view of a width fixing tool.

Fig. 10 is a perspective view showing an installation state of a different embodiment of the dustproof grill according to the present invention.

(explanation of symbols)

[0037]

1: perforated metal plate

2: round hole

3: Long hole (long round hole)

4: Mounting hole

5: Pillar

1a: upper and lower flat parts

1b: Protruding flat part

1c: Tilt the face

Detailed ways

The perforated metal plate of the present invention has a cross-section consisting of a flat portion formed up and down, a protruding flat portion protruding to one side in the horizontal direction at an intermediate portion of the above-mentioned up-down flat portion, and a flat portion connecting the above-mentioned up-down flat portion and The inclined surface of the protruding flat part of the middle part is formed in the shape of a mountain, and is a long metal plate in the left and right directions. Many round holes and long holes are arranged in regular rows in the up and down, left and right directions on almost the entire surface, and the aperture ratio is increased. Set at 20% to 40%.

In the perforated metal plate, on the entire surface of the upper and lower flat parts and the protruding flat part and the inclined part of the intermediate part, or on the entire surface except the upper and lower flat parts, or only on the surface except the upper and lower flat parts and the protruding flat part On the inclined surface of the flat part, many round holes and long holes are arranged in regular rows in the up, down, left and right directions, and the opening ratio is set at 20% to 40%. Mounting holes for mounting on grid posts.

The diameter of the round hole of the perforated metal plate is between 3mm and 9mm, and the long hole is a long hole with semicircular ends. The opening ratio is set at 20% to 40% by combining the above-mentioned circular holes and oblong holes.

The perforated metal plate is a pre-coating material of a molten Zn-Al-Mg-Si alloy, and the molten Zn-Al-Mg-Si alloy has 3-20 wt% of Al, 0.1-10 wt% of Mg, A plating layer consisting of 0.01 to 2 wt % of Si, Zn and unavoidable impurities in the remainder.

In the perforated metal plate of the present invention, the perforated metal plate of the following structure is erected in the horizontal direction between the pillars erected by fixing the lower end on the foundation, and the two ends of the perforated metal plate are fixed On the pillar, the structure of the perforated metal plate is: the cross section of the perforated metal plate consists of a flat part formed on the upper and lower sides, and a protruding flat part protruding to one side in the horizontal direction at the middle part of the above-mentioned upper and lower flat parts. , and the inclined surface connecting the above-mentioned upper and lower flat parts and the protruding flat part in the middle part is formed in the shape of a mountain, and is a long metal plate in the left and right directions, and many circles are arranged in regular rows in the up and down, left and right directions on almost the entire surface. For holes and long holes, the opening ratio is set at 20% to 40%.

The diameter of the round hole of perforated metal plate is the size below 3mm more than 9mm, and slotted hole is the oblong hole that two ends are semicircle shape, and the length direction dimension of the opening of this slotted hole is about 8mm～15mm, and short side The direction size is about 3mm to 5mm. Combining the above-mentioned round holes and oblong holes, the opening ratio is set to 20% to 40%. The metal plate with holes is a pre-coated material of molten Zn-Al-Mg-Si alloy , the molten Zn-Al-Mg-Si alloy is composed of 3-20wt% Al, 0.1-10wt% Mg, 0.01-2wt% Si, Zn and unavoidable impurities in the rest. plating.

The dust-proof grille of the present invention is formed by arranging the above-mentioned dust-proof grille in a plurality of rows at intervals of 20 times or less the effective height above the ground of the dust-proof grille and arranged substantially in parallel.

[Example 1]

[0024] Next, based on the embodiments shown in FIGS. 1 to 4, the perforated metal plate for dustproof grilles according to the inventions described in claims 1 to 4 will be described.

The perforated metal plate 1 for the dust-proof grille of the present invention is shown in A in the front view, shown in B in the side view in Figure 1, and shown in the cross section in Figure 2. The height H is about 250mm, the length in the left and right directions is about 3m, and the structure with a plate thickness of about 1.6mm is made of rolled steel. Viewed in the direction of the cross section, there are flat parts with a vertical width of about 30 mm in the upper and lower sides, and a flat part protruding about 70 mm to one side in the horizontal direction in the middle of these upper and lower flat parts 1a and 1a. The portion 1b is also formed to have a vertical width of about 30mm, and is formed in the shape of a bisected mountain by two inclined surfaces 1c, 1c linearly connecting the upper and lower flat portions 1a and the protruding flat portion 1b in the middle. In addition, on substantially the entire surface except for the portions in contact with the grid pillars at both ends, many round holes 2 and long holes 3 are arranged in regular rows and columns in the up, down, left and right directions, and the aperture ratio is set. 20% to 40%.

By the way, the reason why the aperture ratio is limited to the above-mentioned 20% to 40% is that, as explained in paragraph [0016], if the aperture ratio is configured to be 40% or more, wind and dust can easily pass through, The shielding function and shielding effect required for the dustproof function are insufficient, and it is difficult to expect the dustproof function. Furthermore, it is difficult to achieve an aperture ratio of 40% or more depending on the diameter of the circular hole 2 and the opening size of the elongated hole 3 which will be described later. Conversely, if the opening ratio is configured below 20%, the shielding rate and shielding function will be too high, and the wind pressure (wind load) reduction effect (wind reduction performance) will be poor, and the airflow passing through the dustproof grille will go straight in the wind flow. If the pressure difference with the detoured airflow rotating over the grille is too large, the wind reducing area on the back side of the dustproof grille will become smaller, and the dustproof effect will be weakened. Moreover, from the viewpoint of the structural surface of the dustproof grille, it is not economical to increase the thickness of the perforated metal plate 1 and to increase the cross-section of the grille support in terms of the durability structure because of the large wind load. .

[0026] The specific configuration of the above-mentioned perforated metal plate 1 will be described below.

Many round holes 2 and long holes 3 are arranged on the whole surface of the above-mentioned upper and lower flat parts 1a, 1a and the protruding flat part 1b in the middle part and the inclined surface part 1c according to the opening ratio of 20% to 40%. It is standard, but it may be installed on the entire surface except the upper and lower flat parts 1a, or only on the inclined surface 1c except the upper and lower flat parts 1a and the protruding flat part 1b. In any case, many circular holes 2 and long holes 3 are arranged in regular rows and rows in the up, down, left and right directions of the perforated metal plate 1 as shown in the illustration, and the opening ratio is set at 20% to 40%. . However, the perforated metal plate 1 shown in Fig. 1A, Fig. 3A and Fig. 4A all shows that a plurality of elements are appropriately combined and arranged on the entire surface of the upper and lower flat parts 1a and the protruding flat part 1b and the inclined surface part 1c in the middle. Embodiment of circular hole 2 and elongated hole 3.

At both ends of the upper and lower flat portions 1a in the left-right direction, the mounting holes 4 for mounting the grid support 5 are formed as long holes for easy adjustment in the longitudinal direction (the spacing direction of the grid support).

[0027] Next, the configuration of the perforated metal plate 1 will be described.

The circular hole 2 is set with a diameter of not less than 3 mm and not more than 9 mm. The two ends of the long hole 3 are made into semicircular long holes so that stress concentration is not easy to occur. The size of the opening is about 8 mm to 15 mm in the long side direction and about 3 mm to 5 mm in the short side direction. set. The opening ratio is set to 20% to 40% by designing a combination of the circular hole 2 and the oblong hole 3 having the above-mentioned sizes as appropriate. The size and shape of the round hole 2 and the oblong hole 3 are generally implemented as the configuration of one perforated metal plate 1 with a common (or the same) configuration over the entire surface.

Incidentally, FIG. 1A shows an example of a perforated metal plate 1 having an aperture ratio of 40%. In the case of this embodiment, the diameter of the round hole 2 is 9 mm, and the size of the opening of the oblong hole 3 is set to be about 15 mm in the long side direction and about 5 mm in the short side direction.

FIG. 3A shows an example of a perforated metal plate 1 having an aperture ratio of 30%. In the case of this embodiment, the diameter of the round hole 2 is set to 8 mm, and the size of the opening of the oblong hole 3 is set to be about 12 mm in the long side direction and about 5 mm in the short side direction.

In addition, in the embodiment of Fig. 1A and Fig. 3A, show following structure, be limited to the oblong hole 20 that is arranged on upper and lower flat part 1a, the size of its opening is set as: the dimension of longitudinal direction is about 18mm, short The dimension in the side direction is about 6 mm, which is set slightly larger than the opening of the other oblong holes 3 .

FIG. 4A shows an example of a perforated metal plate 1 having an aperture ratio of 33%. Under the situation of this embodiment, represent the example of following structure: the bore diameter of circular hole 2 is 5mm, and the opening of oblong hole 3 is relatively small, and its long side dimension is about 10mm, and short side dimension is about 4mm, has improved The density of the holes. In addition, in the case of the present embodiment, an example of a structure in which the above-mentioned round holes 2 with a diameter of 5 mm are arranged at high density in the upper and lower flat portions 1 a is shown.

The perforated metal plate 1 of above-mentioned structure, uses the pre-coating material of the molten Zn-Al-Mg-Si alloy that has coating, is manufactured by perforation processing, and this coating is 3～20wt% by Al by weight % , Mg is 0.1 to 10 wt%, Si is 0.01 to 2 wt%, and the remainder is composed of Zn and unavoidable impurities.

Therefore, as described above, the perforated metal plate 1 of the present invention relies on the so-called sacrificial anti-corrosion effect of zinc to prevent rust on the edge (shear surface) of the perforated hole, and does not require a post-perforation process. post-processing. Therefore, even when exposed to severe temperature and climate conditions and strong winds, it can exert excellent anti-rust effect and durable life.

[Example 2]

[0029] Next, an example of a dust-proof grill (including the case of a wind-proof grill and a snow-proof grill, the same below) constructed using the perforated metal plate of the above structure will be described.

The dust-proof grille shown below in Fig. 5 uses the above-mentioned perforated metal plate 1, that is, the cross section is in the shape of a mountain, and a lot of round holes 2 and 2 are arranged in regular rows on the entire surface in the up, down, left and right directions. The slotted hole 3 is a perforated metal plate whose aperture ratio is set to 20% to 40%. Both ends of the perforated metal plate 1 in the left and right direction were attached and fixed to the grid support 5 to construct the dustproof grid shown in FIGS. 5 and 6 . As shown in FIG. 5 , the grid support 5 is erected substantially vertically, and its lower end is fixed to a concrete block foundation 8 buried in the ground.

[0030] The perforated metal plate 1 is mounted and fixed to the pillar 5 by using the mounting holes 4 provided at both ends of the upper and lower flat portions 1a, 1a in the left and right direction. The installation methods can be roughly divided into the following three methods.

The first installation method is the following method: as shown surrounded by circle I in FIG. fixed on the pillar 5.

The second mounting method is a method in which, as shown surrounded by circle II in FIG. Contact and install fixedly on the pillar 5.

The third way of installation is as follows: as shown in Figure 6 and Figure 7, the cross-section of the metal plate 1 with holes in the shape of a mountain is inserted into the H-shaped groove of the grid pillar 5A using H-shaped steel, and the hole The flat parts 1a, 1a of the perforated metal plate 1 overlap each other in the same manner as the above-mentioned first installation method, or as in the above-mentioned second installation method, the flat parts 1a, 1a are juxtaposed to each other in a substantially abutting state toward the pillar 5. Contact and install and fix separately.

No matter the above-mentioned installation method, the perforated metal plate 1 utilizes the installation holes 4 that are pre-set on the left and right ends of the upper and lower flat parts 1a, 1a in contact with the contact grid pillar 5, as shown in Figure 7 and As shown in FIG. 8 , the bolts 10 and the nuts 11 are firmly tightened and fixed.

In particular, depending on the structure of the dustproof grille, the perforated metal plate 1 can also be implemented in a structure that covers the frame surface of the unit frame group assembled into a rectangular frame shape in advance as an installation and fixation on the unit. The unit body on the frame is constructed, and the unit body is installed on the pillar of the dustproof grille. In the case of the above-mentioned embodiment, it is preferable that the unit body can be freely attached to and detached from the grid post, or can be folded, or even installed freely for assembly work.

Fig. 9 shows following embodiment, under the situation (referring to circle II among Fig. The oblong holes 20 (see Fig. 1A or Fig. 3A) of the flat parts 1a, 1a, or the centers of the round holes 21 in Fig. 4A coincide with each other, as shown in Fig. 9 (B), so that the width of the bolt hole 13 is fixed. Parts 12 are in contact with the two outer surfaces and are fastened together by bolts 14 and nuts 15 . In this way, the vertically adjacent perforated metal plates 1, 1 are connected in a single plate shape to construct a dustproof grille having a structure with increased strength, rigidity, and stability.

[Example 3]

Fig. 10 shows the following embodiment, that is, the perforated metal plate 1 of the invention described in the above-mentioned technical solutions 1 to 4 is erected between adjacent grid pillars 5, 5 in the horizontal direction, and the perforated metal plate The two ends of the plate 1 are installed and fixed on the grid pillars 5 to form the two rows of dustproof grids F1 and F2 (but not limited to two rows, but also multiple rows) of the inventions described in the above-mentioned technical solutions 5 to 8. Dust gratings are arranged in a substantially parallel arrangement at a distance L of 20 times or less the effective height K above the ground of the dust-proof gratings F1, F2 to surround many coal piles M, M.

As already explained in the above paragraph [0020], according to the results of the wind tunnel experiment, if the wind blowing from left to right in Fig. 10 (however, conversely in the case of the wind blowing from right to left in Fig. The initial wind speed is V0, then the wind towards the first dust grid F1 is divided into an airflow (assuming that the wind speed is V1) passing through the dust grid F1 while decelerating and going straight to the dust grid F1. The circuitous airflow above (set its wind speed as V2). The velocity V2 of the airflow that detours above the dust-proof grille F1 is accelerated for a while when passing over the vicinity above the dust-proof grille F1, and then is drawn in the direction of the leeward side of the ground to form a wind reduction area. At this time, the ratio of the wind speed V1 of the airflow passing straightly through the dustproof grille F1 while decelerating and the above-mentioned initial wind speed V0 is called a wind reduction rate. If the wind reduction rate is 50% or less, dust, coal dust, etc. will not be scooped up and scattered, and thus it can be seen that there is a dustproof effect as a dustproof grille. Furthermore, it has been confirmed from the results of this wind tunnel experiment that the distance at which the wind reduction rate is 50% or less is within a range of 20 times or less the effective height K above the ground of the first dust fence F1.

[0034] The wind that forms a wind reducing area on the leeward side of the first dustproof grille F1 and flows at the same time also shows the same phenomenon even when it is directed to the second dustproof grille F2 located on the right in FIG. 10 . That is, it is obvious that in front of the second dust-proof grill F2, the flow is divided into an airflow passing straightly while decelerating (assuming that its velocity is V1') and an airflow detouring over the second dust-proof grill F2 ( Let its velocity be V2 '), but, the dust that the wind is transported to the front of the second dust grid F2 falls in the deceleration area in front of the second dust grid F2 and is captured (with Q representing the heap of falling dust ), which can exert a dustproof effect, which has been confirmed.

Therefore, even in a vast land or a coal storage yard, if the dust grids F1 and F2 are spaced at an interval L that is less than 20 times the effective height K above the ground of the dust grids as described above, they will be arranged in a substantially parallel manner. When a large number of columns are provided, an excellent dustproof effect can be expected regardless of the direction of the wind.

[0035] Above, the present invention has been described based on the illustrated embodiment, but of course, the present invention is not limited to the illustrated embodiment. Within the scope of not departing from the purpose and gist of the present invention, including design changes that can be made by those skilled in the art according to needs, and then implementing various solutions, also belong to the present invention.

Claims (9)

1. The perforated metal plate for the dust-proof grille, characterized in that, the cross-section of the perforated metal plate for the dust-proof grille is composed of a flat part formed up and down, and a horizontal part in the middle of the above-mentioned up and down flat part. The protruding flat part that protrudes on one side of the direction, and the inclined surface that connects the above-mentioned upper and lower flat parts and the protruding flat part in the middle are formed in the shape of a mountain, and the perforated metal plate for the dustproof grille is a metal that is long in the left and right direction. A large number of round holes and long holes are arranged in regular rows in the up, down, left, and right directions on almost the entire surface of the plate, and the opening ratio is set at 20% to 40%. 2. The perforated metal plate for a dustproof grille according to claim 1, wherein: On the entire surface of the upper and lower flat parts and the protruding flat part and the inclined part in the middle part of the perforated metal plate, or on the entire surface except the upper and lower flat parts, or only on the inclination except the upper and lower flat parts and the protruding flat part On the face, many round holes and long holes are arranged in regular rows in the up, down, left, and right directions, and the opening ratio is set at 20% to 40%. Furthermore, attachment holes for attachment to the grid post are formed at both ends in the left-right direction of the up-and-down flat portion. 3. The perforated metal plate for dust-proof grille as claimed in claim 1 or 2, wherein the diameter of the circular hole of the perforated metal plate is 3mm to 9mm, and the long hole is semicircular at both ends. Oblong hole, the long side dimension of the opening of the long hole is about 8mm ~ 15mm, the short side direction size is about 3mm ~ 5mm, the above-mentioned round hole and oblong hole are combined, and the opening ratio is set to 20% ~ 40% %. 4. The perforated metal plate for dust-proof grilles as claimed in any one of claims 1 to 3, wherein the perforated metal plate is a pre-coated material of molten Zn-Al-Mg-Si alloy, the The molten Zn-Al-Mg-Si alloy has a plating layer composed of 3-20 wt% Al, 0.1-10 wt% Mg, 0.01-2 wt% Si, Zn and unavoidable impurities in the remainder. 5. A dustproof grille, characterized in that the perforated metal plate of the following structure is erected in the horizontal direction between pillars erected by fixing the lower end on the foundation, and the two ends of the perforated metal plate are installed Fixed on the pillar, the structure of the perforated metal plate is: the cross section of the perforated metal plate consists of a flat part formed up and down, and a protruding flat part protruding to one side of the horizontal direction at the middle part of the above-mentioned up and down flat part. part, and the inclined surface part connecting the above-mentioned upper and lower flat parts and the protruding flat part in the middle part are formed in the shape of a mountain, and the perforated metal plate is a long metal plate in the left and right directions, and the upper and lower left and right directions are formed on almost the entire surface. Many circular holes and long holes are arranged in regular rows and columns, and the opening ratio is set at 20% to 40%. 6. The dust-proof grid as claimed in claim 5, characterized in that, the diameter of the circular hole of the perforated metal plate is the size of more than 3mm and less than 9mm, and the slotted hole is a semicircular slotted hole with two ends, and the opening of the slotted hole The size of the long side direction is about 8mm~15mm, and the size of the short side direction is about 3mm~5mm. Combining the above-mentioned round holes and oblong holes, the opening ratio is set at 20%~40%. The perforated metal plate is A pre-coating material of a molten Zn-Al-Mg-Si alloy, the molten Zn-Al-Mg-Si alloy has 3 to 20 wt% of Al, 0.1 to 10 wt% of Mg, and 0.01 to 2 wt% of Si in terms of weight percent %, the remainder is a coating made of Zn and unavoidable impurities. 7. The dust-proof grid as claimed in claim 5 or 6, wherein the perforated metal plate is installed on the grid support by using installation holes arranged at both ends of the left and right directions of the upper and lower flat parts, and between the upper and lower flat parts and the middle Combination of many round holes and long holes on the entire surface of the protruding flat part and the inclined face, or on the entire face except the upper and lower flat parts, or only on the inclined face except the upper and lower flat parts and the protruding flat part , the aperture ratio is set at 20% to 40%. 8. The dustproof grid according to claim 7, wherein the perforated metal plates adjacent to the upper and lower sides of the grid support are mounted on the grid support by abutting each flat part, or overlapping the flat parts. Mounted on the grid support, the overlapping flat parts are connected by aligning the holes formed in the flat parts, and passing the width fixing parts through the holes. 9. A dust-proof grille, characterized in that the dust-proof grille constructed as follows is spaced at an interval of 20 times or less the effective height above the ground of the dust-proof grille and arranged in a plurality of rows substantially parallel to each other. The construction of the dust-proof grid means that the metal plate with holes is erected between the adjacent grid pillars in the horizontal direction, and the two ends of the metal plate with holes are installed and fixed on the grid pillars. The dustproof grid described in the above-mentioned claims 5-8.

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