JPS607826Y2 - Rubber screen for vibrating sieve - Google Patents

Description

[Detailed description of the invention] The present invention relates to a screen made of an elastic mesh body mainly used for sifting ores, coke, crushed stone, etc., and has improved wear resistance and prevents clogging compared to conventional screens. At the same time, it is an object of the present invention to significantly reduce impact noise caused by collision with objects to be sorted.

Conventionally, this type of screen has mainly been made of a wire mesh made of wire or an iron plate with holes of various shapes punched out.
Punched wire mesh was used, but these screens usually have an amplitude of 1 to 20 mm and a frequency of 100 to 20 mm when sieving hard and angular materials such as coke, ore, crushed stone, etc.
Since it was attached to the support frame of a 200 ocpm vibrating sieve machine and used under vibration conditions, it suffered from significant wear and produced large impact noises.

Recently, screens made of rubber or polyurethane elastic plates have been proposed for the purpose of improving such wear and noise defects, and have shown some degree of effectiveness. Since it is used as a single elastic body, during use, it bends due to the weight of the material to be sorted, and permanent elongation occurs, making it unusable, and the results are not completely satisfactory. Although clogging is somewhat improved compared to wire mesh, the condition is still not satisfactory.

The inventors of the present invention focused on the above-mentioned facts and conducted various studies to improve them, and as a result, they created a completely new screen that does not have the various drawbacks of conventional screens such as those mentioned above. , suggested earlier.

That is, such a screen uses a high-strength, low-elongation disciplinary rope as a tensile member, and a rope-like body in a circular, oval, or other polygonal shape, the tensile member being covered with a rubber-like elastic material such as polyurethane. are arranged in parallel at equal intervals, and rope-like elements having the above-mentioned cross-sectional shape, on which tensile bodies are also buried, are stacked in parallel at equal intervals and intersected at right angles, and the intersecting parts of each rope-like element are strengthened. It is a rubber screen formed by joining together.

In this screen, the upper layer is arranged parallel to the flow direction of the material to be sorted, and the lower layer is arranged parallel to the direction perpendicular to the flow direction of the material to be sorted, so it exhibits extremely effective performance in preventing clogging and has high strength. Because the tensile material is passed through the screen, it is possible to obtain a screen that does not bend even when pressurized by the weight of the material to be sorted, which is a significant improvement over conventional screens. Considering the cross-sectional area occupied by the tensile member and the rubber layer covering it, if the rubber layer is thin, wear is likely to occur due to contact with the object to be sorted.
If the wall thickness is increased, the amount of rubber increases and the bulk of the screen increases, resulting in an increase in weight, which is unavoidable in terms of handling and economy.

Therefore, the present invention further improves the screen according to the above-mentioned proposal from the viewpoint of wear resistance. It is characterized by a structure in which the elements are consciously distributed as downwardly as possible.

In this case, the cross-sectional shape of the rope-like element includes circular, elliptical, semi-elliptical, trapezoidal, rectangular, square, polygonal, and irregular cross-sectional shapes that combine these shapes. The tensile material used includes twisted yarns such as wire steel wire, natural fiber, chemical fiber, glass fiber, carbon fiber, etc., and wire steel wire is particularly preferred.

Hereinafter, the present invention will be described in detail with further reference to the accompanying drawings.

Figures 1A to 1G show rope-like bodies of general shapes that can be used in the screen of the present invention, and are made of wire steel wire, cotton thread, synthetic fibers such as nylon, Tetron, vinylon, etc., glass fibers, carbon fibers, etc. The tensile body 1 is made of twisted yarn with high tensile strength and low elongation, and the cross-sectional shape is circular ( Figure 1A), oval (Figure 1B)
, semicircle (Fig. 1 C), semi-ellipse (Fig. 1 D), square (Fig. 1 E), or trapezoid (Fig. 1 F), or an irregular shape combining an arc and a chord (Fig. 1 G). ) rope-like element a-y
g is shown in the figure, and these are usually made by drawing out the tensile member 1 from an extruder and simultaneously coating it with a wear-resistant rubber-like elastic member 2.

In addition, FIGS. 2A to 2G show rope-like bodies used in the screen of the present invention and forming the features of the present invention, and similar to those shown in FIG. It has an irregular cross-sectional shape that combines polygons such as trapezoids and squares, circular arcs, and chords, and is surrounded by a wear-resistant rubber elastic material such as polyurethane rubber, natural rubber, or synthetic rubber. 2' is coated, but in these rope-like elements a to g', the position of the tensile member 1' in the rubber-like elastic body 2' is consciously distributed as unevenly as possible, and the thickness of the worn part is It has an enlarged shape.

This rope-like body is effective in extending the life of the screen depending on the type of material to be sorted, for example, when the material to be sorted is subject to severe wear due to impact such as coke, ore, etc.

Therefore, in the screen of the present invention, as shown in FIGS. The rope-shaped element j-l is laminated on top of the rope-shaped element j-l perpendicularly to the rope-shaped element Hzg, and the formed intersecting part S is firmly heat-fused or bonded with an adhesive. The joints are integrated.

In addition, if the coating layer of the rope-like element is rubber, it is also possible to make a vulcanized product of each rope-like element in advance, laminate them, and bond them with adhesive, or unvulcanized rope-like After laminating the element bodies in two layers in a net shape, oven vulcanization is performed, or it is also possible to vulcanize and bond the rope-like elements in a mold having grooves in the shape of the laminated layers.

Furthermore, in the case of rubber or liquid polyurethane, the tensile material is first placed in a net shape in a mold having grooves in which the aforementioned rope-like bodies are laminated in a net shape, and then unvulcanized rubber or other material is placed in that space. A rubber screen suitable for the purpose of the present invention can also be obtained by filling liquid polyurethane by a transfer method or casting method, followed by vulcanization or curing.

As shown in FIG. 4, the mesh-like rubber screen obtained in this way is
A horizontal rope-like body Hxg is used for the lower layer, while
In the upper layer, the rope-like elements 3'-g' having tensile elements unevenly distributed in parallel in the flow direction are stacked orthogonally to the elements in the lower layer, thereby achieving the important objective of the present invention. It exhibits extremely effective performance in preventing screen clogging, which is
The upper layer's rope-like body with unevenly distributed tensile material increases wear resistance, and since the screen containing the tensile material is fixed and attached in a tensioned state, it can withstand pressure from the weight of the objects to be sorted. A screen without bending can be obtained.

Hereinafter, the prevention of clogging in the rubber screen will be explained with reference to FIGS. 8 and 9.

FIG. 8 is a partial plan view of a case where a conventional wire mesh or rubber screen is clogged with materials to be sorted, and the material to be sorted 4 is surrounded by crosspieces 5 made of steel wire, rubber, etc. If it is clogged, if you observe it on the same plane, the object to be sorted 4 will be difficult to move due to the strong stress of grasping the ore etc. from all directions, in the direction of the arrow and in the direction of the arrow opening, so it will easily become clogged. .

FIG. 9 is a partial plan view of the screen of the present invention when the objects to be sorted are clogged.

In this invention, as mentioned above, the vertical and horizontal rope-like bodies a-gv''~g' constituting the mesh are divided into an upper layer and a lower layer, and the upper layers a'~〆 are arranged parallel to the flow direction of the material to be sorted. As shown in FIG. 9, on the same plane of the upper layer, the objects to be sorted are gripped from only two directions by one of the rope-like elements a' to g', and moreover, the objects to be sorted are gripped from only two directions by one of the rope-like elements a' to g'. Because it is a rope-like element, it is highly elastic and has a remarkable degree of freedom compared to conventional screens, so it has a remarkable effect in that it is difficult to get clogged, and it also has a horizontal screen that prevents the flow of materials to be sorted. It also has the advantage that the flow is smooth because the crosspieces are sunk downwards.

Next, the relationship between the sieving efficiency of the screen and the usage conditions will be described.

Screens can be installed horizontally or at an angle in the flow direction of the material to be sorted. Conventional rubber screens have a batten shape; The size of the opening is quite different, and the sieving ability is also different.

This can be explained using Figures 5a and 6b and Figure 6.
FIG. 5a shows a conventional screen consisting of a crosspiece 5 made of rubber or the like in the form of a batten, and an opening part 6, and FIG.
In the AA' cross-sectional view, the screen is installed horizontally, the material to be sorted flows in the direction of the arrow, and l indicates the interval between the openings.

FIG. 6 is a sectional view taken along the line AA' in FIG. 5a, showing a state in which the screen is attached with an inclination of θ in the direction of the flow arrow.

In this case, the opening length in the flow direction is l', which is smaller than .

If the thickness of the screen is t, then 1:' = (1 knee t, tan θ) cos θ.

As a result, as θ becomes larger, the moving speed of the objects to be sorted becomes faster, but l' also gradually decreases, and as a result, the size of the objects to be sorted actually becomes smaller, and the sieving ability decreases.

Therefore, if θ is made smaller, the change in the length of one side due to the opening will be reduced, but the moving speed of the material to be sorted will be slow, and this will cause uneven distribution of the tensile material in the upper layer, which is installed parallel to the flow direction of the material to be sorted. The rope-like element may be any one of a' to g' in Fig. 2, but the rope-like element in the lower layer perpendicular to the flow direction may be based on a circular shape among a to g in Fig. 1. to do at C
9g is preferable. To further explain this with reference to FIG. 7, the rope-like element located in the lower layer is based on a circular cross section.

If Cv g is used, the diameter of this rope-like element is φt, and the opening interval is l when it is installed horizontally, then
The opening length L' in the flow direction is >J'= (,/-t,
tan θ) cos θ.

Therefore, since the reduction in mesh size due to the influence of the inclination angle θ is smaller than that of the conventional perforated screen, the sieving accuracy is good, and the sieving efficiency is also good with less reduction in the opening ratio due to the inclination.

Next, embodiments of the present invention will be described.

(Example) A case where a normal circular rope-like element with a diameter of 14 mm is used for both the upper layer and the lower layer, and a case where the rope-like element located on the upper layer is 14 m in diameter.
mφ, tensile member eccentric to the rope center by 3.5 mm,
For each case of unevenly distributed rope-like element, the screen size is 14 mmφ x 30 holes, 260 occlusion W x 120
0mm L as 2100rrrmW x 4800m
mL of vibrating sieve screens were constructed, and each screen processed limestone with a particle size of 0 to 75 TrrIrL at a rate of 600 tons per hour.

As a result, the one using a normal rope-shaped element had a throughput of 1.7 million tons and became unusable after 12 months of use, whereas the one using an eccentric rope-like element had a throughput of 20,000 tons. It was able to withstand 19 months of use.

This shows that the abrasion resistance of the rope-like element with unevenly distributed tensile elements according to the present invention is much improved compared to the conventional one.

In addition, in the above explanation, we have explained the case where the rope-like element with unevenly distributed tensile material is used only in the part of the upper layer that requires wear resistance. Of course, the present invention also includes a construction using a rope-like element body.

As described above, the screen of this invention is made by laminating rope-like bodies of various cross-sectional shapes in which a tensile material with low elongation and high strength is coated with abrasion-resistant rubber in two layers vertically and horizontally, and the crossed parts are joined. Since it is an integrated screen, it not only has improved abrasion resistance compared to conventional screens, but also prevents clogging and significantly reduces impact noise caused by impact with objects to be sorted. Since a rope-like body with unevenly distributed tensile material is used at least for the part that undergoes most of the wear due to contact with the material to be sorted in the upper layer, the wear resistance is further improved, and the elasticity due to the thickness of the rubber is improved. This helps prevent clogging by pushing out objects that tend to get stuck in the mesh.
It has far more advantages than a screen consisting simply of a rope-like element centered around a tensile material.

Note that by intertwining rope-like elements having various irregular cross-sectional shapes as appropriate, it is possible to obtain a strong screen that is suitable for each purpose and has a large joint area.

[Brief explanation of the drawing]

1 and 2 A to G are perspective views of various cross-sectional shapes of rope-like elements having tensile elements for rubber screens that can be used in the present invention, and FIG. 3 is a schematic plan view of the rubber screen according to the present invention. , FIG. 4 is a partial perspective view thereof, FIG. 5 a is a partial plan view of a conventional batten-like rubber screen, FIG. −A' section is θ
FIG. 7 is a side view showing the rubber screen of the present invention tilted by θ accuracy, and FIG. FIG. 9 is a partial plan view when the screen of the present invention is clogged with objects to be sorted.

Claims (1)

[Scope of utility model registration request] A rope-like body consisting of a tensile body made of a disciplinary rope with low elongation and high strength, and a wear-resistant rubber that can be heated and melted and covered around the tensile body and occupies most of the area in cross section. In a configuration in which the upper and lower layers are stacked in parallel with each other, the upper layer is parallel to the flow direction of the material to be sorted, and the lower layer is orthogonal to the flow direction. A rubber screen for a vibrating sieve, characterized in that a base body is used in which the tensile body embedded in the coating rubber layer is unevenly distributed downward, and the intersecting parts are joined and integrated.