DE2122196A1 - Layer plate made of elastic material with fabric insert - Google Patents

Description

DIPL.-ING. HARRO GRALFS? 1 ? ? PATENT ADVOCATE

33 BRAUNSCHWEIG

AM BORGERPARK 8 TELEPHONE (0531) 74798

May 4th 1971 G / mc - J 512

Leiand Harnden Jacobs Longdon Stud, Longdon Road Farm, Darlingscott, near Shipston-on-Stour, Warwickshire / England

Layer plate made of elastic material with fabric insert

The invention relates to a layer plate made of elastic material with a fabric insert, in particular such a layer plate, which is resistant to the impact of large-grain material, especially a laminate for the production of classifying sieves but also for use as baffle plates or as conveyor belts, whereby under Coarse-grained material, in particular mining products or products that are obtained in open quarrying operations.

The object of the invention is to create laminated panels which, when used as sieves or conveyor belts, have a have a longer service life than known sieves or conveyor belts for classifying or conveying such coarse-grained Materials are used. Another task of the

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SANK. DIUTICHI IANIC AO .. IRAUKtCHWIIO. ACCOUNT NU. 03/0178 »· POITICHICKi NANNOVII 36 Io 61

The invention is to use such a material to create sieve plates which lead to a higher sieving efficiency to lead.

According to the invention <Hese object is achieved in that the laminated plate has three layers of an elastomeric, plate-shaped material, with the interposed Layers of a woven mesh material are joined together, the mesh material is maintained under tension in at least one direction during the bonding of the layers to one another.

The intermediate layer of elastomeric material is preferably softer than the outer layers of elastomeric material. The two outer layers of elastomeric material can have essentially the same hardness. The two outer layers of elastomeric material expediently have a Shore hardness between 60 and 65? ^{while the intermediate layer} made of elastomeric material has a Shore hardness between 55 υη <1.

The layers of woven mesh-like material can be either in the direction of the warp or the weft or in both Directions biased. The threads that are pretensioned are expediently pure polyester threads or through polyester fibers reinforced threads. The threads to be pre-tensioned are preferably about 5% of their length in the tension-free state preloaded with a tension equal to 10% of the Breaking stress does not exceed. While the threads are held under tension, the elastomeric layers become connected by the layers of fabric so that a coherent plate is created.

If the layer plate according to the invention as a sieve plate for

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a classifying sieve is used through which the particles maintain » of a predetermined size, the plate can mil? Holes are provided through which the particles can pass through. The holes are driven through the plate from the back, that is from the surface opposite to the surface on which the particles to be classified impinge. The holes can ρ get any desired cross-sectional shape. For example, you can be circular or rectangular.

An embodiment of the laminated board according to the invention is described in detail below with reference to the drawing, which shows a cross section through the plate in the direction the warp thread of the mesh-shaped fabric inserts shows.

As can be seen from the drawing, the multilayer board has an upper layer 1, an intermediate layer 2 and a lower layer 3, which consist of elastomeric, plate-shaped material. The material can be a natural rubber or a synthetic rubber. However, other synthetic plastics with rubber or Rubber properties are used. Between the two layers 1 and 2 is a layer of a woven one Mesh material 4 is arranged and between layers 2 and 3 is another layer 5 of a similar woven fabric Mesh material attached. In the two layers 4 and 5, the warp threads 4a and 5a extend in the cutting direction, while the weft threads 4b and 5b are perpendicular extend to cut. The fabric layers 4 and 5 can consist of any suitable material. In the exemplary embodiment, they are woven from nylon threads that run in the warp direction are reinforced by polyester threads in order to give a greater tensile strength in the direction of the warp thread.

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The upper layer 1 and the lower layer 2 made of the elastomeric material are considerably harder than the intermediate layer 2 and preferably have essentially the same Hardness. The elastomeric material used for the topsheet 1 and the backsheet 5 appropriately had one Shore hardness between 60 and 65, while the elastomeric The material used for the intermediate layer 2 has a Shore hardness between 35 and .40.

The laminated sheet is produced in that the elastomeric layers 1, 2 and 3 and the intervening fabric ^ layers 4 and 5 through the fabric layers 4 and 5 through using a suitable glue together connected, if appropriate, with the simultaneous application of heat and pressure.

During the application of the pressure for connecting the layers, the fabric layers are tensioned in the direction of the warp threads and kept under tension until the connection is made. The warp threads 4a and 5a are stretched under the pretension by about *?% Compared to their length in the untensioned state, the tensile stress not exceeding 10% of the tensile stress at break.

The elastomeric intermediate layer is in the finished panel tensioned while the elastomeric outer layers 1 and 3 are compression tensioned when the fabric layers 4 and 5 seek to return to the untensioned state after the connection has been established.

If the layer plate is to be used as a sieve plate, holes of the appropriate size are made in the plate

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stamped. The holes are punched from the Starting from the surface that lies at the bottom in use. At the This is the layer 3 in the illustrated embodiment. The holes can have a square, rectangular or circular cross-section, but also any other get desired shape. Due to the tension in the elastomeric layers, the punched hole is affected at its lower end a bell-shaped widening 6, as shown in the drawing.

If the sandwich plate is used as a sieve plate, deflector plate or conveyor belt, it will turn in the direction of use the warp thread of the fabric layers 4 and 5 under tension held. The plate can also be used for other purposes, for example for lining a slide. In this case it is attached to the clothing to be covered by an adhesive Surface attached.

In the above, an embodiment has been described at of the fabric layers 4 and 5 in the direction of their warp threads are biased. The fabrics can, however, also be pretensioned in the direction of their weft threads, as well as a simultaneous pre-tensioning in the direction of the warp threads and the weft threads can take place. When the threads are both to be pretensioned in the warp direction as well as in the weft direction, pure polyester fabric is expediently used as the material used.

The use of pre-tensioned fabrics 4 and 5 allows it is to achieve a larger free screen surface, since narrower webs between the screen holes 6 can be provided and furthermore square or rectangular sieve openings can be provided without the risk that

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- 6 tear the corners of the sieve holes.

The laminated board according to the invention further has one substantially greater tensile stress than known rubber screen plates, and a screen plate according to the invention thus has a much greater shock resistance and a considerable Stability under tension. This is due to the fact that the pretensioning of the fabric layers 4 and 5 the elastomeric layers also in the clamped state are essentially dead. Under these conditions there is much less risk of the elastomeric Layers cut or cut through the coarse-grained and often pointed-edged material to be treated otherwise damaged.

Due to the pretension of the fabric layers 4 and 5 can much larger weights are borne by the sieve plate than by known rubber sieve plates. Due to the greater strength of the plate according to the invention there is also much less risk of the plate in the vicinity of the brackets necessary to keep the panel under tension, fatigue prematurely.

Further advantages of the laminated sheet according to the invention are due to the fact that the elastomeric intermediate layer has a buffer effect. Since this layer is softer than the other layers, the impact resistance of the laminated board increases improved, whereby a longer service life of the outer layer 1 is achieved. The soft intermediate layer 2 acts in a similar way to the air in a pneumatic tire. This is due to the fact that, though Rubber is incompressible, the intermediate layer of softer rubber 2 in the areas of the holes 6 can be displaced.

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If the layer plate is perforated as a sieve slat, the intermediate layer made of softer rubber can be moved easily and then actually act like a compressible medium, like the aforementioned air in a pneumatic tire.

The intermediate layer 2 also has a considerable abrasion resistance and determines the abrasion on the inner walls of the sieve holes. It was further pointed out that the Intermediate layer 2 increases the natural frequency of the layered plate, which results in a higher degree of efficiency when used as a sieve is achieved.

It was also found that the greater softness of the The intermediate layer and the elasticity of the layer plate together significantly reduce the risk of the screen holes 6 can be clogged by sieved material.

The layered plate according to the invention finally has the advantage that it is ruhip-er in operation and that which is to be treated Material is less stressed. This is a particular advantage when the material to be treated, for example Coal is where abrasion and breakage should be avoided as much as possible.

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OMÖINAL IKSPECTSD

Claims (8)

Patent claims Ί. Layer plate made of elastic material with fabric insert, characterized in that the plate has three layers (1, 2, 3) made of elastomeric, plate-shaped! Has material, which are connected to one another with interposed layers (4, 5) of a woven mesh-like material are elastically biased under tension during the binding in at least one stitch direction is. 2. Plate according to claim 1, characterized in that the Intermediate layer (2) made of elastomeric material is softer than the outer layers (1, 3) made of elastomeric material. 3. Plate according to claim 2, characterized in that the two outer layers (1, 3) made of elastomeric material have essentially the same hardness. 4. Plate according to claim 3) characterized in that the both outer layers (1, 3) made of elastomeric material have a Shore hardness between 60 and 65 and the intermediate layer (2) made of elastomeric material has a Shore hardness between 35 and 4-0. 5- plate according to any one of the preceding claims, characterized characterized in that the layers (^ -, 5) made of woven mesh material are biased in the direction of the chain. 6. Plate according to one of claims 1 to 5? characterized, that the layers (4, 5) made of woven msechen-like Material are pretensioned in the direction of their weft threads. 109885/1 IU -Q- 7 plate after. Claim 5 or 6, characterized in that that the pre-tensioned threads are made of polyester or are reinforced by polyester threads. 8. Plate according to one of claims 5 to 7), characterized in that the pre-tensioned threads are stretched under the pre-tension by about 5% of their initial length, at a tensile stress does not exceed Λ0 ° / ο the tensile-breaking stress and that the elastomeric layers through the prestressed fabric layers in between are connected to one another. 9. Plate according to one of the preceding claims for use as a sieve plate in a classifying sieve, characterized in that the plate is provided with sieve holes (6 ~) , the sieve holes being punched into the plate starting from the rear surface, that is the surface opposite the surface on which the coarse-grained materials to be classified impinge. 109885/1144 Blank page