JPH0131954B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rubber screen for a vibrating sieve that efficiently sieves powdery substances without clogging.

(Prior Art) At present, this type of rubber screen for fine particles generally has a rope-like shape with a thin rope diameter, the tensile member being covered with a polyurethane elastic material having good abrasion resistance, as shown in Figure 7 A and B. A structure is known in which the elements 1 and 2 are stacked vertically and horizontally, and the crossed parts are heat-welded.In this case, both ends are usually glued together with a hook bottom plate, etc., and the hook locking part and It is used by

(Problem to be Solved by the Invention) However, in a rubber screen having the above structure, if the rope diameter is made smaller and the porosity is increased, that is, if the mesh is made larger, clogging will be reduced, but the strength will be reduced. This not only causes rope cutting accidents, but also causes undesirable problems such as contamination of treated materials larger than the mesh into the undersize.

In particular, the slot type shown in Figure 7 (b) is effective in preventing clogging, but flat objects may fall out, and the horizontally long slot type is prone to clogging due to the strong lateral movement of the opening. Because the sides are long, objects to be processed collide frequently and the horizontal rope-like element body 2 is abraded, while the vertically elongated slot type places a large load on the rope-like element body 1 in the vertical direction, reducing its strength. have.

Moreover, in any of the above types, clogging prevention is not sufficient if the material to be treated is of a bad type, such as coal powder or crushed stone powder, which hardens after adhesion, and the hardened powder adheres to the four corners of the mesh. The problem remains that it gradually grows toward the center of the mesh, ultimately blocking the mesh and causing clogging.

The present invention addresses the above-mentioned problems, particularly by improving the structure of the screen itself, and also by focusing on the attachment to the hook attachment part, thereby reducing the mechanical primary vibration of the sieve machine and the mesh of the rubber screen. The purpose of this is to increase the secondary vibration due to the resonance effect so that even stubborn objects can be sieved without clogging.

(Means for Solving the Problems) That is, the present invention for achieving the above object is characterized by using twisted yarn such as steel cord or chemical fiber as a tensile material, and covering the periphery with a polyurethane elastic material. Then, rope-like elements having arbitrary cross-sectional shapes such as circular, elliptical, square, and polygonal shapes are arranged in parallel, stacked and crossed with the vertical direction at the top and vertically and horizontally perpendicularly intersected, and the crossed parts are heated and welded. In the rubber screen for vibrating sieve, which is formed by locking the rubber screen joined by the hook locking part,
A rope-like element in a direction perpendicular to the traveling direction of the object to be processed is used as a supporting rope-like element, and one or more auxiliary rope-like elements are arranged between the supporting rope-like elements, and the above-mentioned auxiliary Except for the ends of the rope-like element, only the end of the support rope-like element is attached and fixed to the locking hook in a state where the longitudinal rope-like element is loosened in a wave shape.

(Function) Therefore, when the rubber screen for vibrating sieve having the above-mentioned structure is used, the vertical rope-like element is supported by the above-mentioned support ropes and auxiliary ropes in a wave shape, and the mechanical primary vibration of the sieve machine is generated. The secondary vibration of the screen mesh that accompanies the primary vibration increases due to the resonance effect, causing a movement that loosens and peels off the stubborn processing material that adheres to the mesh, thereby preventing clogging and maintaining the screen for a long time. It is possible to carry out stable sieving.

(Embodiments) Hereinafter, embodiments of the rubber screen for vibrating sieves according to the present invention will be described further based on the accompanying drawings.

FIG. 1 is a perspective view of a rope-like element used in the rubber screen of the present invention, in which a is a rope-like element 1 in the longitudinal direction of the screen (the flow direction of the processed material), and b
2 is a horizontal rope-like element, 2 is for a support rope, and 3 is for an auxiliary rope.

In Fig. 1a, 1 is a core made of a tensile material t made of twisted yarn with good flexibility such as aromatic polyamide, aliphatic polyamide, polyester, steel cord, etc., and surrounded by a wear-resistant polyurethane elastic material having thermoplasticity. 4 is a longitudinal rope-like element (hereinafter referred to as a vertical rope) of a cored rope with a circular cross section or a coreless rope consisting only of a polyurethane elastic body.

On the other hand, FIG. 1b shows a supporting rope element 2 (hereinafter referred to as supporting rope element) having a circular cross-section, which is made of the same material as the tensile member T and has a low elongation and high strength and is surrounded by a polyurethane elastic material 4. (referred to as a rope) and an auxiliary rope element 3 made of the same material and in the same shape as the longitudinal rope-like element 1.
(hereinafter referred to as the auxiliary rope).

Usually, each of these rope-like elements 1, 2, 3 is
It is formed by covering the polyurethane elastic body 4 while pulling out the tensile members t and T from the extrusion molding machine. And rope-like element 1,
2 and 3 usually have a circular cross section as shown in the figure, but they are not limited to a circular shape, and may have any other shape such as an ellipse, a quadrilateral, a polygon, etc. In addition to polyurethane, the covering elastic body may be a single material of natural rubber or synthetic rubber, or a wear-resistant rubber-like elastic body made of a blend of these.

Further, in the illustrated example, the auxiliary rope 3 is shown to be thinner than the support rope 2, but depending on the application, both may have the same diameter.

FIG. 2 is a partial plan view of a rubber screen mesh formed using a vertical rope 1 mainly made of polyurethane elastic material as described above, a horizontal support rope 2, and an auxiliary rope 3, and shows the thick support rope with a circular cross section. 2 are drawn in parallel at a constant interval L, and between them, a thin auxiliary rope 3 (which may have the same diameter as described above), also having a circular cross section, is connected to the support rope 2. ~ In the figure, a plurality of ropes are arranged in parallel at equal intervals, and on top of them, a thin vertical rope 1 with a circular cross section is arranged in parallel at equal intervals and perpendicular to the horizontal rope-like elements 2 and 3. They are arranged in layers to form a substantially square or rectangular mesh.

When these screens are laminated, they are heated from above and below by a heating heater to firmly weld the intersecting portions P of each screen.

Moreover, in this case, the end of the support rope 2 of the lateral support ropes and auxiliary ropes 2 and 3 is made to protrude from the auxiliary rope 3 by a required length;
The end of the auxiliary rope 3 is a free end.

FIGS. 3 to 5 show an embodiment in which the rubber screen thus constructed is attached and fixed to the hook locking portion, and this will be explained below based on FIGS. 3 to 5.

That is, FIGS. 3 and 4 are a partial plan view and a partial cross-sectional view showing the structure in which both ends of the rubber screen are attached and fixed to the hook locking parts,
When the spacing between the support ropes 2 before and after installation is L and L', the vertical rope 1 is forcibly loosened so that L>L', and the vertical rope 1 is installed in a wave shape as shown in the partial longitudinal section of Figure 5. .

Then, for the end locking part of the support rope 2, the polyurethane elastic body 4 at the tip is cut and removed at a required position G to expose the tensile body T, and the tip of the tensile body T is untwisted and separated. Leave it in a relaxed state,
On this tensile member T, an iron hook 5 having an L-shaped cross section with staggered through holes H provided in the bottom plate 5a is placed close to the bottom plate 5a. An elongated wear-resistant sheet 6 made of thermoplastic polyurethane or the like is placed on the support rope 2 at a position slightly shifted from the exposed part G of the body T (after the tensile body T is exposed, adhesive is applied to the exposed part and then dried). By applying liquid polyurethane (thermosetting) on top of the sheet 6 in the vertical direction and curing it so that the sheet 6 is partially buried in the width direction, as shown in FIG. A part of the sheet 6 is buried in the polyurethane elastic body R together with the tension body T and the hook bottom plate 5a,
At the same time, liquid polyurethane flows into the through hole H of the bottom plate 5a and exerts an anchoring effect, and both ends of the support rope 2, the exposed tensile body part T, the bottom plate 5a of the hook, and a part of the sheet 6 are bonded into a strong and integrated structure. It constitutes a hook locking part.

In this case, the end of the auxiliary rope 3 is a free end.

However, it is not necessarily necessary that the end of the auxiliary rope 3 is not fixed to the sheet as shown in FIG. 3, but it is possible to have a structure in which the end is fixed to the abrasion-resistant sheet 6 as shown in FIG. It is also possible to do so.

In FIG. 6, the same reference numerals as in FIG. 3 indicate the same parts.

(Effects of the Invention) As described above, in the rubber screen for vibrating sieve of the present invention, the horizontal rope is formed by the support rope and the auxiliary rope, and the end of the support rope is made to protrude from the auxiliary rope, and the end of the auxiliary rope is attached to the hook. Since only the end of the release support rope is attached and fixed to the hook locking part of the rubber screen with the vertical rope loosened in a wave shape, the primary vibration of the vibrating sieve machine and the wave shape of the rubber screen mesh are The secondary vibrations caused by the screen resonate well and can effectively prevent clogging of stubborn materials, and there is no need to reduce the rope diameter or particularly increase the opening ratio of the mesh, thus significantly extending the life of the screen. It is extremely effective as a rubber screen for not only lumpy materials such as ore and crushed stone, but also granular materials and powdery materials.

[Brief explanation of drawings]

Figures 1a and 1b are perspective views of a rope-like element in the vertical and horizontal directions used in the rubber screen of the present invention;
FIG. 2 is a partial plan view of the rubber screen of the present invention before installation, FIG. 3 is a partially cutaway partial plan view showing how the rubber screen of the present invention is installed, and FIG. 4 is a partial plan view of the rubber screen of the present invention before installation.
Figure 5 is a partial cross-sectional view taken along the line A-A.
FIG. 6 is a partially cutaway partial plan view showing a modified embodiment of the rubber screen of the present invention, and FIGS. 7A and 7B are mesh configurations of a conventional rubber screen. FIG. 1... Longitudinal rope-like element, R... Polyurethane elastic body, 2... Lateral support rope-like element, H...
...Through hole, 3... Lateral rope-like element, 4... Polyurethane elastic body, 5... L-shaped hook, 6...
Abrasion resistant sheet, T, t...Tensile material.

Claims (1)

[Claims] 1 A rope-like body made of twisted yarn such as steel cord or chemical fiber as a tensile body and covered with a polyurethane elastic body and having an arbitrary cross-sectional shape such as a circle, an oval, a square, or a polygon is pulled in parallel. Align them, make them vertically and horizontally at right angles with the vertical direction at the top, and stack and intersect them.
In a rubber screen for vibrating sieves, in which the ends of the rubber screen are joined by heat welding at their intersections and are attached to hook locking parts, the rope-like element supports the rope-like element in the direction perpendicular to the traveling direction of the processed material. and one or more auxiliary rope-like elements disposed between the supporting rope-like elements, with the ends of the supporting rope-like elements protruding from the auxiliary rope-like elements, and longitudinal ropes. 1. A rubber screen for a vibrating sieve, characterized in that only the end portion of the support rope-like element is integrally attached and fixed to a locking hook while the support rope-like element is loosened in a wave shape.