JPH0732575Y2 - Blade cover for road cutting machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a blade cover mounted on a blade of a road cutting machine used for cutting concrete surfaces, asphalt surfaces and the like (hereinafter referred to as road surfaces).

[Conventional technology]

For example, as shown in FIG. 6, in this type of road cutting machine,
A front wheel 6 and a rear wheel 8 supported by a support arm 4 are installed on the lower surface of the cutting machine body 2 so as to be able to move on the road surface R and the like, and a driving member such as a hydraulic cylinder for rotationally driving the support arm 4 is provided. With this operation, the rear wheel 8 can be rotated about a support shaft 10 of the rear wheel 8 in a plane vertical to the road surface R or the like.

A rotary shaft 12 driven by an engine or the like is installed below the front part of the cutting machine body 2. The rotary shaft 12 has a blade 14 having a cutting tip formed by sintering diamond grains at its peripheral end. Is fixed. The cutting depth of the blade 14 with respect to the road surface R or the like is adjusted by adjusting the inclination of the cutting machine body 2 due to its rotation.

A blade cover 86 is installed on the blade 14 to prevent chips from scattering and to reduce cutting noise. Conventionally, the blade cover 86 is composed of an upper cover 90 fixed to the cutting machine body 2 by a locking piece 88, and a lower cover 92 connected below the upper cover 90. The lower cover 92 is provided with a connecting plate 96 that is locked to the lower surface of the upper cover 90 by a rubber band 94, and a bottom plate 98 that slides on the road surface R, for example. In between
A bellows 100 is installed in order to avoid an obstacle of the lower cover 92 when the blade 14 is cut. This bellows 100
The elongation of the lower cover 92 maintains the shape of the lower cover 92 when not cut, and the contraction prevents the lower cover 92 from being hindered by the burial of the blade 14 during cutting. Expansion and contraction of the bellows 100 is performed by the guide rod 102 arranged between the connecting plate 96 and the bottom plate 98.
Guided by. Further, although not shown, a connection port is formed in the front and rear of the bottom plate 98, so that chips in the blade cover can be discharged through a suction hose, for example, by an exhaust device installed in the cutting machine body. There is.

[Problems to be solved by the device]

By the way, in the structure having the bellows as described above, the number of components is large, so that the manufacturing cost is high and the weight is increased. Since the components of the lower cover are integrally formed, the weight of the lower cover is large for a large-diameter blade, and it is very difficult to handle the detachable cover.

In addition, when the chips are sucked, the bellows are attracted to the one having lower rigidity and are easily broken by contact with the blade, which shortens the life of the blade cover or damages the blade of the blade itself.

Furthermore, in a so-called wet cutting machine that supplies water at the time of cutting to cool the blades and prevent chips from scattering, the removal work after cutting work is required because the solid content of sludge water adheres and accumulates in the cover. Since a large amount is accumulated on the folds of the bellows, the work was extremely difficult and complicated due to the shape that was difficult to remove.

On the other hand, in Japanese Utility Model Publication No. 57-6570, the blade cover is divided into upper and lower cover members, and the lower cover member is fitted to the outer periphery of the lower end portion of the upper cover member to enable vertical movement. Although a blade cover for is disclosed, since this upper and lower cover members are connected by a simple nesting structure, when connecting the suction hose before and after the lower cover member, Since the blade cover expands and contracts in a fan shape, the degree of bending of the front and rear suction hoses differs, causing an imbalance in the bending resistance due to the elasticity of the suction hose, and the lower cover member tilts left and right with respect to the front and rear direction of the upper cover member. The upper and lower cover members may be overlapped with each other, which may hinder their vertical movement.

Therefore, the present invention provides a blade cover that does not use bellows and that can be expanded and contracted smoothly even if a suction hose is connected, and that has a simple structure that can reduce manufacturing costs and reduce weight. To aim.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the present invention is arranged such that one of the upper cover member fixed to the cutting machine main body at a fixed position with respect to the blade and the upper cover member connected below the upper cover member enters the other. And a lower cover member having a nesting structural relationship that overlaps with each other, and a suction hose connected to an exhaust device for sucking chips in the blade cover is attached to the front and rear of the lower cover member, and the rotary shaft of the blade. Of the upper cover member and the lower cover member, and a guide piece is projected from the front end portion of the upper cover member and the guide piece is engaged with the other front end portion of the upper cover member and the lower cover member. A hole is formed, and a pair of guide plates each having a vertical hole groove are provided at the rear end of either the upper cover member or the lower cover member. The rear end portion of the other is formed opposite to the right is obtained by a structure in which connection pins are inserted across each hole a groove is provided.

[Action]

According to this invention, when the blade is cut into the road surface or the like by the rotation of the cutting machine body, one of the upper cover member and the lower cover member is contacted with the other by contacting the lower cover member with the road surface. The contraction operation to enter into is started.

At this time, the guide piece projecting from the front end of one of the upper cover member and the lower cover member is guided to the engaging hole formed in the front end of the other cover member, and at the rear end of either one. The lower cover member contracts in a fan shape relative to the upper cover member by the connection pin provided at the other rear end being guided in the formed hole groove of the guide plate.

In addition, the guide shaft of the lower cover is guided by the guide recess, so that the obstacle of the lower cover member due to the burying operation of the blade is avoided.

The chips generated during cutting of the road surface and the like are sucked and removed from the inside of the blade cover to the exhaust device by suction hoses provided before and after the lower cover member.

After the cutting work, with the upward movement of the cutting machine body that separates the blade from the road surface, etc., the expansion and contraction operation is started in which the overlapping portion is reduced and restored due to the weight of the lower cover member, and the lower cover member is Return to the predetermined position when cutting.

〔Example〕

1 to 5 show an embodiment of the present invention. In addition,
The same parts as those of the conventional example are indicated by the same reference numerals, and the duplicate description will be omitted.

The cutting machine body 2 is covered with a blade 14 and a blade cover 16
Is installed. The blade cover 16 includes an upper cover member 18 fixed to the cutting machine body 2 and a lower cover member 20 connected below the upper cover member 18.

A substantially U-shaped locking piece 24 is formed on the rear side of the upper cover member 18 via a bracket 22.
It can be locked to a locking pin 26 fixed to the side portion of the. On the other hand, a mounting plate 30 having a through hole 28 is formed on the front side, and can be fixed by a mounting bolt 34 to a bracket 32 having a screw hole fixed on the front side of the cutting machine body 2. As a result, the upper cover member 18 is fixed to the cutting machine body 2 at a fixed position with respect to the blade 14.

The blade 14 is fitted and inserted into the rotary shaft 12 with the flanges 36 and 38 interposed in the front and rear, and is fastened with the nut 40. Correspondingly, at the lower ends of both sides of the upper cover member 18, the rotary shaft 12
And housing recesses 42, 44 for housing the nut 40 are formed. As a connecting member for the lower cover member 20, the upper cover member 18 is provided with a guide piece 46 at the front end thereof, and at the rear end thereof below the locking piece 24, a vertical hole groove 48,
A pair of guide plates 52, 54 each having 50 are formed facing each other on the left and right.

The lower cover member 20 includes a lower cover body 56 having a size into which the upper cover member 18 fits, and a bottom plate 58 that slides on a road surface R or the like. The lower cover body 56 is formed in a substantially fan shape having a large arc length in front so that the difference in the inclination degree due to the rotation of the cutting machine body 2 can be efficiently absorbed. Inside the lower cover body 56, the upper cover member
A guide recess 60 that allows the rotation shaft 12 to move when the blade 14 is cut is formed at a position corresponding to the accommodating recess 42 of 18.

An elongated engaging hole 62 for engaging the guide piece 46 of the upper cover member 18 is formed at the front end of the lower cover body 56 in the vertical direction, and a guide plate of the upper cover member 18 is provided at the rear end portion. 52,54
Insertion holes 66 and 68 for the connection pin 64 that is locked to the are formed. The lower cover member is formed by the guide piece 46 and the connecting pin 64.
The lower cover 20 is connected to the upper cover member 18 below the upper cover member 18 by its own weight. In this example, the guide piece
Although 46 is fixed to the main body of the upper cover member 18,
However, the present invention is not limited to this. For example, a screw hole may be formed in the main body of the upper cover member 18, and a bolt member may be inserted into the screw hole from the outside of the engagement hole 62 and screwed.

A suction hose 70 connection port is provided on each of the front and rear ends of the bottom plate 58.
72,74 are formed. The other end of the suction hose 70 is connected to, for example, an exhaust device 76 installed in the cutting machine body 2. The front end 58a of the bottom plate 58 is bent upward with an inclination so that it can smoothly move on the road surface R or the like. Also, the bottom plate
Plural sludge water suction ports 78 are formed around the bottom surface of the 58.
Further, for example, a rubber skirt piece 80 is fixed around the side portions with a pressing piece 82 and a set screw 84 in order to increase suction force.

Next, the expansion / contraction operation of the blade cover 16 associated with the rotation of the cutting machine body 2 will be described.

FIG. 1 shows a so-called non-cutting state in which the blade 16 does not contact the road surface R or the like. In this state, the guide piece 46 of the upper cover member 18 is located at the upper end of the engagement hole 62 of the lower cover member 20, and the connecting pin 64 is located at the lower end of the hole grooves 48, 50 of the guide plates 52, 54. The lower cover member 20 is held in place. When the cutting machine body 2 is rotated to form the cut groove having a predetermined depth, as shown in FIG. 4, the bottom plate 58 of the lower cover member 20 is grounded and the lower cover member 20 is grounded.
The operation of inserting the upper cover member 18 into the upper cover member 18, that is, the contraction operation of the blade cover 16 is started. Guide piece 46 is engagement hole
62 is moved downward, and the connecting pin 64 is moved upward in the groove 48, 50. At the same time, the rotating shaft 12, which is the blade shaft, moves downward in the guide recess 60 of the lower cover member 20. This absorbs the difference in inclination between the cutting machine body 2 and the lower cover member 20. When the overlapping of the upper cover member 18 and the lower cover member 20 progresses and the blade 14 reaches a predetermined depth, the state shown in FIG. 5 is obtained.

Further, when the cutting machine body 2 is rotated upward to obtain the non-cutting state, the extending operation of the blade cover 16 in which the overlapping portion between the upper cover member 18 and the lower cover member 20 is reduced is started, and the lower cover is started. The member 20 is in the home position shown in FIG.

Although the lower cover member 20 is inserted into the upper cover member 18 in this example, the structure can be reversed, and the same function can be obtained in this case as well.

[Effect of device]

According to this invention, the blade cover has a nesting structure composed of an upper cover member and a lower cover member, and a guide piece protruding from one of the front end portions of the upper cover member and the lower cover member has a front end portion of the other. The guide pin is guided in the engagement hole formed in the one end, and the connection pin provided in the other rear end is guided in the hole of the guide plate formed in one rear end. The engagement between the guide piece and the engagement hole restricts the inclination of the lower cover member to the left and right with respect to the front-rear direction of the upper cover member, and the engagement between the hole groove and the connection pin causes rattling in the front-rear direction of the lower cover member. As a result, the lower cover member does not come into partial contact with the overlapping portion of the upper cover member due to the bending resistance due to the elasticity of the suction hose attached to the lower cover member. There can be performed sector expansion and contraction of the blade cover that stretch greater than the rear end smoothly.

Further, since the expansion and contraction operation of the blade cover to which the suction hose is connected can be obtained without forming the bellows, it is possible to avoid damage due to contact with the blade or loss of the blade itself, which is a drawback of the bellows having no rigidity. As a result, the durability of the blade cover is improved, and cleaning work after use is facilitated.

Furthermore, since the structure can be made with a small number of parts, it is possible to reduce the weight and the manufacturing cost.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an embodiment of a blade cover for a road cutting machine according to the present invention, which is attached to a road cutting machine, and FIG. 2 is an exploded perspective view of the blade cover shown in FIG. The drawing is a partial sectional view taken along the line III-III in FIG. 2, FIGS. 4 and 5 are explanatory views of the contraction operation of the blade cover accompanying the cutting movement of the blade, and FIG. 6 is a road cutting machine for a conventional blade cover. It is an outline side view of the state where it was attached to. R: Road surface, etc .: Cutting machine body 12: Rotating shaft, 14 ... Blade 16 ... Blade cover 18 ... Upper cover member 20 ... Lower cover member, 46 ... Guide piece, 48, 50 ... … Hole groove, 52, 54 …… Guide plate, 60 …… Guide recess, 70 …… Suction hose, 76 …… Exhaust device

Claims (1)

[Scope of utility model registration request] 1. A cutting machine body having a blade is rotated in a plane perpendicular to a road surface or the like to form a cut groove having a predetermined depth,
A blade cover attached to a road cutting machine that moves the cutting machine body to cut a predetermined distance, the upper cover member fixed to the cutting machine body at a fixed position with respect to the blade, and the upper cover member A lower cover member that is connected downward and has a nesting structural relationship in which one of the upper cover member and the upper cover member enters the other and overlaps, and the lower cover member is connected to an exhaust device and is a chip in a blade cover. A suction hose for sucking is attached to the front and back of the suction hose, and a guide recess for the rotary shaft of the blade is formed, and a guide piece is provided at the front end of one of the upper cover member and the lower cover member so as to project. The front end is formed with an elongated engaging hole in the up-and-down direction with which the guide piece is engaged, and the upper cover member and the lower cover member. A pair of guide plates each having a vertical hole groove are formed at the rear end of one of the left and right sides so as to oppose each other on the left and right, and a connecting pin that is inserted across the above-mentioned hole grooves at the other rear end. A blade cover for a road cutting machine, which is provided with.