JPH0149554B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) 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 this type of rubber screen made of a reticular elastic body, an apparatus as shown in FIGS. 8 and 9 has been used. As is clear from the figure, this device includes an alignment plate 24 having a large number of parallel grooves, a presser roller 23 having grooves for holding the transverse resin rope 22, which is moved by a screw 30 while rotating on the alignment plate. The presser roller 2
The thermoplastic resin rope 21 in the vertical direction is arranged on the alignment plate 24 of the frame 25, and the thermoplastic resin rope 22 in the horizontal direction is arranged on the presser roller 23. A configuration in which both ropes are held in alignment and crossed under pressure, and hot air or gas flame is blown from a hot air blowing nozzle 28 toward this crossing point to heat and melt the ropes while moving a press roller to join them under pressure. When manufacturing a screen, the longitudinal resin ropes 21 are fitted and held in grooves provided on the alignment plate 24, while the horizontal resin ropes 22 are inserted into grooves provided on the presser roller 23. Then, the presser roller 23 is moved to the pressing position adjusted by the adjusting screw 27 using the air cylinder 26 and pressed, and hot air is blown from the hot air blowing nozzle 28 to heat the adhesion sides of both the vertical and horizontal resin ropes 21 and 22. The mounting frame 29 is moved by the feed screw 30 while melting. Then, the pressing roller 23 sequentially moves in the direction of the arrow A in FIG. 8 to press 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 22 is cut, the presser roller 23 is moved upward by the air cylinder 26, and the feed screw 30 is reversed and returned to the starting point, that is, the right end position in FIG. Meanwhile, the longitudinal resin rope 21 is fed by a certain amount in the direction shown in FIG. 9B by an appropriate drawing device (not shown), stops, and completes the process, and thereafter the above-described process is repeated. I was getting a screen.

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) There is a quality problem due to large variations in welding force due to welding many pieces at the same time.

(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 purpose of this invention is to improve the use of an alignment plate with grooves and the winding of an elastic rope around the outer peripheral surface of a cylindrical drum.

(Means for Solving the Problems) That is, the present invention, which solves the above problems and achieves the objects, is characterized by the following process operations.

(b) Holding ropes of various cross-sectional shapes whose main component is an elastic material such as polyurethane or rubber by inserting them into the grooves of a predetermined size alignment plate that has a number of grooves corresponding to the mesh of the screen. ) arranging at least two locking ropes at right angles on the ropes of the alignment plate at a predetermined interval and welding them to the ropes of the alignment plate to form a rope sag; (c) forming the rope sag; Utilizing a drum of a predetermined size with grooves in the circumferential direction on both sides of the body, fitting a locking rope into the groove and winding it; While rotating the drum, another rope whose main constituent is the above-mentioned elastic material is spirally wound or wound at a certain pitch with the required tension, and then welded to the rope sag molded body to form a cylindrical rubber screen. (e) Cutting the cylindrical rubber screen at an arbitrary position in the direction of the drum axis to obtain a rubber screen of a predetermined size. Here, the rope serving as a constituent material in the present invention is made of rubber, polyurethane, etc. The main component is an elastic material such as synthetic fibers, and includes both cored products with a stranded cord such as synthetic fiber or metal wire in the core, and non-core products without such 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.

Also, although this rope usually has a circular cross section, it is not limited to a circular cross section;
Any shape such as an oval, a rectangle, or a polygon may be used.

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

1 to 6 show the manufacturing method of the present invention in the order of steps.
As shown in the figure, a cored or non-core vertical rope 1 (hereinafter abbreviated as N rope) in the flow direction of the sorted material is aligned with the screen mesh, and an alignment plate P of a predetermined size having a large number of parallel grooves 2 is placed. The locking ropes 3 are fitted into the grooves 2 and held, and the locking ropes 3 are placed on the N ropes 1 at both ends of the alignment plate P in a perpendicular direction, and welded by a heating device such as a heater using hot air.

Here, when the N rope 1 is fitted into the groove of the alignment plate P, it is desirable that the cross-sectional shape of the groove of the alignment plate is formed to match the cross-sectional shape of the rope so that the rope pitch does not change. When fitting the N rope 1 with a circular cross section into a groove with a rectangular cross section, the width of the groove should be equal to the rope diameter and the depth should be 1/2 to 2/3 of the rope diameter. There is no need to fit the shape.

Furthermore, the length L of the alignment plate is not particularly limited. For example, when the length of the alignment plate is short, after welding the first locking rope, the N rope 1 is pulled out using an appropriate pull-out device, etc. Pull out a certain length in the X direction,
It is also possible to weld the next locking rope 3. After welding, both ends of the N rope 1 are cut and taken out from the alignment plate to obtain a rope sagging molded body 4 as shown in FIG. 3.

At this time, if the N rope 1 that forms the rope sag-shaped body 4 is made long, it is possible to continuously form a sag-shaped body of any size.
It is very economical as it has less loss and reduces molding man-hours.

Next, this sagging molded body 4 is wound around a drum D of a predetermined size having fitting grooves G provided in the circumferential direction on both sides as shown in FIG. 4, with the locking rope 3 fitting into the grooves G.

Next, as shown in FIG. 5, a rubber rope 1', that is, a transverse rope (hereinafter abbreviated as T rope) that intersects at right angles to the N rope in the flow direction of the sorted material, is attached while rotating the drum D. The N rope 1 placed horizontally on the drum is welded to the N rope 1 under a certain tension using a guide roll (not shown) connected to a heater, and the N rope 1 is welded to the N rope 1 at a certain pitch one after another in a spiral. wrapping,
Form a cylindrical rubber screen.

Note that although the above method involves heating and welding one T rope 1' on the N rope 1 while spinning, the present invention is not limited to this method; It is also possible to spin the ropes at the same time, and it is also possible to weld them to the N rope 1 by applying heat and welding them after winding a certain amount or all of the T rope 1'.

Note that during welding, the pressing force of the T-rope 1' is required, but the pressing force is exerted by the tension when the T-rope is wound.

The thus obtained cylindrical rubber screen is then cut in the direction of the drum axis at an arbitrary position and expanded to obtain a rubber screen S of a predetermined size shown in FIG. 6.

In the above example, a rope sag molded body is formed using an N rope, but first a rope sag molded body is formed using a T rope, and then the N rope is wound on a drum and welded to form a rubber screen. This is also possible.

In the above process, if the drum used in the process shown in Fig. 4 is of a certain size, it is possible to select the size by preparing a plurality of drums of the required size that match the various sizes of the rubber screen. Accordingly, the screen size can be appropriately adjusted and manufactured.

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

FIG. 7 shows one of the drums 11 used in this method.
An example is shown in which a plurality of dividing plates, four dividing plates 11a, 11b, 11c, and 11d in the figure, are provided at each tip of arms 12, 13, 14, and 15 that extend and contract in the radial direction. By expanding and contracting the drum, the size of the drum can be adjusted and a screen of any size can be obtained.

In this case, the locking rope 16 is usually located on the upper surface of the dividing plate.

Note that the arm extension/contraction mechanism, drum rotation mechanism, etc. can be easily designed using known means.

Thus, by using each of the steps described above, it is possible to efficiently manufacture rubber screens with accurate fine pitches.

(Effects of the Invention) As described above, in manufacturing a rubber screen, the present invention uses an alignment plate and a drum in combination to fit a rope into the groove of the alignment plate to create a continuous sagging molded body, which is then cut as required. The main purpose of this method is to wrap the rope in the other direction on the drum, and then wrap the rope in the other direction perpendicularly to the rope and weld the joint. It has a great effect.

(1) Since the rope sag molded body can be formed continuously by using alignment plates of a predetermined size, there is little loss of rope and the number of man-hours for forming the sag can be reduced, making it very economical. Furthermore, since the alignment plate can be a flat plate, the equipment can be simplified compared to the case where a drum is used.

(2) The manufacturing method is generally simple, and the number of man-hours is significantly reduced compared to conventional methods, and production capacity is significantly improved. The cost is less than half, and the production capacity is more than quadrupled.

(3) 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, when multiple rows of warp ropes and weft ropes are lined up and welded at the same time, the degree of melting occurs. Since N is one rope and T is a large number of ropes, the rope diameter is much larger than before.
The variation in melt viscosity is reduced.

(b) In the present invention, since the rope is crimped using a tension that wraps around the rope, 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.

(4) 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 by using winding around a drum, which is much more effective than conventional methods. It is possible to form thin ropes.

[Brief explanation of drawings]

Figures 1 to 6 are process explanatory outline diagrams showing each step of the manufacturing method of the present invention, Figure 7 is another embodiment of the drum used in the present invention, and Figures 8 and 9 are for the conventional method. FIG. 1 is a front view and a side view showing an overview of the device used. 1,1'...rope, 2...groove, 3,16...
Locking rope, 4... Rope sagging molded body, 11
...Drums, 11a, 11b, 11c, 11d...
...Dividing plate, 12-15...Arm, P...Aligning plate, D...Drum, S...Rubber screen, G
...Drum groove.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a rubber screen, characterized in that the following steps (a) to (e) are performed in the order listed. (b) Holding ropes of various cross-sectional shapes, the main component of which is an elastic substance such as polyurethane or rubber, by fitting them into the grooves of a predetermined size alignment plate that has a number of grooves that match the mesh of the screen. ) arranging at least two locking ropes at right angles on the ropes of the alignment plate at a predetermined interval and welding them to the ropes of the alignment plate to form a rope sag; (c) forming the rope sag; Utilizing a drum of a predetermined size with grooves in the circumferential direction on both sides of the body, fitting a locking rope into the groove and winding it; While rotating the drum, another rope whose main constituent is the above-mentioned elastic material is spirally wound at a certain pitch with the required tension, or after the rope is welded to the rope sag molded body to form a cylindrical rubber screen. (e) Cutting the cylindrical rubber screen at an arbitrary position in the direction of the drum axis to obtain a rubber screen of a predetermined size; (2) A rope-wrapped drum whose main constituent is an elastic substance is a drum of a certain size; A method for manufacturing a rubber screen according to claim 1. 3. The method of manufacturing a rubber screen according to claim 1, wherein the rope-wrapping drum whose main component is an elastic material is an expander-type drum that can be expanded and contracted.