JPH038261B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a rubber screen mainly used for sieving ore, coke, crushed stone, etc.
In particular, the present invention relates to a method of manufacturing a rubber screen made of a reticular elastic body that has good abrasion resistance, good sieving efficiency, and can significantly reduce impact noise.

(Prior Art) Conventionally, as a method for manufacturing a rubber screen mainly made of a reticular elastic body, an apparatus as shown in FIGS. 5 and 6 has been used. As is clear from the figure, this device includes an alignment plate 14 having a large number of parallel grooves, a presser roller 13 having grooves for holding the transverse resin rope 12, which is moved by a screw 20 while rotating on the alignment plate. The presser roller 1
The thermoplastic resin rope 11 in the vertical direction is placed on the alignment plate 14 of the frame 15, and the thermoplastic resin rope 12 in the horizontal direction is placed on the presser roller 13. A structure in which both ropes are held in alignment and intersected under pressure, and hot air or gas flame is blown from a hot air blowing nozzle 18 toward this intersection, thereby heating and melting both ropes while moving a press roller and joining them under pressure. When manufacturing a screen, a vertical resin rope 11 is fitted into a groove provided on an alignment plate 14 and held therein, while a horizontal resin rope 12 is provided on a presser roller 13. Then, the presser roller 1 is held by the air cylinder 16.
3 to the pressing position adjusted with the adjustment screw 17 and press it, and while blowing hot air from the hot air blowing nozzle 8 and heating and melting the adhesion sides of both the vertical and horizontal resin ropes 11 and 12, the mounting frame 19 is fixed with the feed screw 20. move it. Then, the pressing roller 13 sequentially moves in the direction of the arrow A in the same figure to pressure and join the molten parts, and the joining operation ends at the end, that is, the left end in FIG.

Next, the transverse resin rope 12 is cut, the presser roller 13 is moved upward by the air cylinder 16, and the feed screw 20 is reversed and returned to the starting point, that is, the right end position in FIG. Meanwhile,
The longitudinal resin rope 11 is fed a certain amount in the direction shown in FIG. 6B by an appropriate drawing device (not shown), stops and finishes the process, and the screen is then obtained by repeating the above process. Ta.

However, the following drawbacks were found in the above method. In other words, (1) As the number of ropes increases, the number of preparation steps increases;
There is a problem with production efficiency.

(2) Since a large number of wires are welded at the same time, the welding force varies greatly, which poses a quality problem.

(3) When the rope becomes thinner, for example less than 2.0mmφ, the leveling of the plate, hot air temperature conditions,
It becomes difficult to adjust the speed, increasing the burden on the worker, and causing problems in workability.

Things like that. And these drawbacks are usually
This is noticeable when the wire diameter is small, and there are restrictions on the implementation of the manufacturing method.

(Problems to be Solved by the Invention) The present invention deals with the above-mentioned actual situation, improves the drawbacks of the conventional method, and is a means for manufacturing a rubber screen that can be easily applied even when a thin wire diameter rope is used as a constituent material. The object of the present invention is to improve the use of a cylindrical drum and the winding of an elastic rope around the outer peripheral surface of the cylindrical drum.

The present applicant uses at least two drums at the same time, winds a rope spirally around one drum to make a molded body, cuts it as required, unfolds it, and attaches it to the other drum in the direction. A method of manufacturing a rubber screen has been proposed in which a rope in the other direction is spirally wound in a direction orthogonal to the rope, and the joints are welded to each other.

The present invention differs from the above-mentioned invention in that it omits the need to transfer the rope sag molded product to another drum.

(Means for Solving the Problems) That is, the present invention is characterized in that a rope of an arbitrary cross-section, the main component of which is an elastic material, is spirally wound at a constant pitch on the outer peripheral surface of a cylindrical drum while rotating the drum. A spiral layer is wound around the outer peripheral surface of the cylindrical drum, and a zigzag layer is used to stretch the rope in the transverse direction, that is, in the axial direction of the drum, over the required length in the axial direction of the drum on the outer peripheral surface of the drum. and then forming the other one on the previously formed molding layer,
A cylindrical rubber screen is created by welding that rope with the rope that constitutes the previous forming layer, and then the cylindrical rubber screen is cut in the axial direction at an arbitrary position to make a rubber screen of a predetermined size. be.

Here, the rope used as a constituent material in the above-mentioned present invention is one whose main constituent is an elastic material such as rubber or polyurethane, and is a cored rope having a twisted wire cord such as synthetic fiber or metal wire in the core. This includes both coreless materials and coreless materials that do not have a core material. Furthermore, it is important that the elastic material on the surface can be welded, and materials that are not suitable for welding are excluded.

When the above-mentioned rope is stretched horizontally on the outer peripheral surface of the drum, it is possible to simply arrange it horizontally, but it is preferable to form a U-shaped folded portion at both ends to form a zigzag shape. Usually, a ring with pins set up at a constant pitch at required intervals in the axial direction is disposed on the ring or the same drum, and a rope is tied to the pins and stretched in a zigzag shape by hand or machine.

Although it is preferable to stretch a plurality of ropes horizontally, the number of ropes to be stretched in a zigzag pattern is not limited to one, but it is also possible to stretch a plurality of ropes at the same time. In either case, it is necessary to sequentially rotate and feed the drums at a required pitch.

Although the cylindrical drum around which the rope is wound may normally be of a fixed size, an expander-type drum is used in order to be able to freely manufacture screens of any size, and the rope is wound around it. It is also preferable to mold a rope sag molded article, and the present invention includes both of these.

(Examples) Hereinafter, examples of the manufacturing method of the present invention will be described in detail with further reference to the accompanying drawings.

FIG. 1 shows one embodiment of the method of the present invention, in which a transverse rope (hereinafter abbreviated as T-rope) perpendicular to the flow direction of the sorted material on the screen is first wound around the drum, and then a rope in the flow direction of the sorted material is wound around the drum. (hereinafter abbreviated as N rope) is welded in a zigzag pattern. As is clear from the figure, one end is connected to the second
As shown in the figure, a rubber T-rope is wrapped and locked in a zigzag pattern around a plurality of pins P, P... protruding from the side of the cylindrical drum 2, and then stored in a bobbin (not shown). 1 is passed through a guide roll (not shown) and wound around the outer circumferential surface of the drum 2 at a constant tension and pitch while rotating the drum 2 as shown in Figure 1, and at the terminal position, the other end of the T rope 1 is wound. As with the starting end, the end is wrapped around a pin protruding from the opposite side of the drum 2 and locked.

In this case, although not shown, the guide roll sends the rope to the drum, and gradually moves in the left and right directions within a required range as the drum rotates to maintain a constant pitch between the ropes as they are wound.

Next, the drum is rotated at appropriate pitches on the T-rope forming layer wound on the drum 2, and one or more rubber N ropes 1' are placed on the T-rope forming layer. A guide rail with a U-shaped folded part 3 formed at the end with an amplitude extending over the required axial length of the drum (in the figure, approximately the axial length of the drum) and a heater connected manually or mechanically as appropriate. Then, under a certain tension, it is welded to the rope 1 in a zigzag pattern and stretched.

Of course, without creating a zigzag pattern, multiple N
Stretch the rope 1′ horizontally by hand or machine,
It may also be stretched horizontally at a fixed pitch, that is, rotated by the opening of the screen.

Note that during welding, the pressing force of the T-rope 1 is necessary, but the pressing force is applied by the tension during the N-rope forming.

The thus obtained cylindrical rubber screen is then cut in the direction of the drum axis at an arbitrary position, for example at the dotted line position in the figure, and expanded to obtain a rubber screen of a predetermined size.

In each of the above processes, if the drum 2 used is of a predetermined size, it is possible to prepare a plurality of drums of the required size suitable for various sizes, and adjust the screen size appropriately according to the selection of the size. can do.

However, a more suitable method for adjusting the screen size is to use an expander-type drum that can be expanded or contracted.

Figure 4 shows one of the drums 2' used in this method.
An example is shown in which a plurality of divided plates (in the figure, four divided plates 2'a, 2'b, 2'c, 2'd) are connected to arms 4, 5, 6, and 7 that extend and contract in the radial direction. It is provided at each tip, and by extending and contracting the arms, the size of the drum can be adjusted, allowing a screen of any size to be obtained.

On the other hand, FIG.
In order to wind the rope 1 and then stretch the N rope 1' horizontally, a ring 9 with pins 8 set up at a constant pitch is arranged on both sides of the cylindrical drum 2 as described above, and the N rope 1' is first stretched. The T-rope 1 is hung on the pin 8 and stretched manually or mechanically on the outer circumferential surface of the drum 2 in a zigzag pattern to form a zigzag layer, and then the T rope 1 is stretched on the outer circumferential surface of the drum 2 at a constant pitch and with a constant tension while rotating the drum 2. This is a case of welding and wrapping. In this case, the size and pitch of the pins 8 must be changed each time the size of the screen is changed, but welding is easier than in the above case due to the pressing force generated by wrapping.

Note that it is possible to use a drum that can be expanded and contracted, that the winding is performed under a constant tension using a guide roll connected to a heater, and that the cylindrical rubber screen can be cut at any position to create rubber of a specified size. The use of a screen is the same as in the above case.

By carrying out the method described, it is thus possible to produce rubber screens with one drum, in each case without having to transfer to another drum.

(Effects of the Invention) As described above, the present invention is a method of forming a rope wrapping layer and a horizontal layer on the outer peripheral surface of one drum, welding them together, and cutting them at arbitrary positions to make a screen of a predetermined size. Compared to conventional manufacturing methods, it has various superior effects as described below.

(1) The manufacturing method is generally simple and compared to conventional methods,
The number of man-hours is greatly reduced and the production capacity is significantly improved.For example, compared to the conventional method, the number of welding man-hours is less than 1/10, the total number of man-hours is less than 1/5, the cost is less than 1/2, and the production capacity is more than 4 times as large.

Further, by winding the rope spirally around the outer peripheral surface of the drum, there is no need for a groove for inserting the warp or weft into the drum, and there is an advantage that the rope pitch and rope diameter can be freely adjusted.

(2) The welding of the ropes becomes uniform, resulting in improved quality and a good appearance. To explain this in more detail, (a) The conventional method uses 4 to 5 bobbins on the T side and 20 bobbins on the N side.
~30 bobbins are used, but due to variations in the diameter of the extruded rope itself, variations in melt viscosity occur when multiple rows of warp ropes and weft ropes are lined up and welded at the same time. In order to mold one or more ropes, variations in rope diameter and melt viscosity are much smaller than in the past.

(b) In the method of the present invention, since the rope is crimped using the tension that wraps it around, the pressing force is constant and uniform welding can be achieved.

(c) Moreover, unlike the conventional method, the rope is not pressed from the outside with rolls, so the rope is less deformed and the appearance is better.

(3) Conventionally, it was possible to weld only up to about 1.6 mmφ, but by using the method of the present invention, it is possible to weld even small ropes such as 1.0 mmφ and 1.2 mmφ, making it easier to weld than conventional methods. It is possible to form thin ropes.

(4) Since two drums are used and the product is manufactured on one drum without being transferred to another drum, labor is saved and the number of man-hours is further reduced.

[Brief explanation of the drawing]

FIG. 1, FIG. 2, and FIG. 3 are schematic diagrams showing each embodiment of the manufacturing method of the present invention. FIG. 4 is another embodiment of the drum used in the method of the present invention, and FIGS. 5 and 6 are front and side views schematically showing the apparatus used in the conventional method. 1, 1'...Rope, 2, 2'...Drum, 2'
a~2'd...Dividing plate, 3...Folding part, 4~
7...Arm, P, 8...Pin, 9...Ring.

Claims (1)

[Scope of Claims] 1. A spiral layer in which a rope of an arbitrary cross-sectional shape, the main component of which is an elastic substance such as polyurethane or rubber, is spirally wound around the outer peripheral surface of the cylindrical drum at a constant pitch while the drum is rotating; First, one of these layers is formed on the outer circumferential surface of the drum, and then the remaining other layers are formed before the above. A cylindrical rubber screen is created by forming the rope on top of the molded layer and welding the rope to the previous molding layer forming rope, and then
A method of manufacturing a rubber screen, comprising cutting the cylindrical rubber screen in the axial direction at an arbitrary position to obtain a rubber screen of a predetermined size. 2. The method for manufacturing a rubber screen according to claim 1, wherein the horizontal layer is a zigzag layer stretched in a zigzag shape with U-shaped folded portions formed at both ends on the outer peripheral surface of the drum. 3. The rubber screen according to claim 2, wherein a ring with pins set up at a constant pitch is provided on both sides of a cylindrical drum, and a rope is stretched around the pins in a zigzag pattern on the outer peripheral surface of the drum. Manufacturing method. 4. The method for manufacturing a rubber screen according to claim 1, 2, or 3, wherein the cylindrical drum is a drum of a constant size. 5. The method for manufacturing a rubber screen according to claim 1, 2, or 3, wherein the cylindrical drum is an expander-type drum that can be expanded and contracted.