JPS6327819Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a rubber screen for sieving, and is used by being attached to a vibrating sieve machine for sieving crushed rock, iron ore, limestone, gravel, etc.

(Prior art) In addition to wire mesh, plates made of natural or synthetic wear-resistant rubber are used to sieve relatively small pieces of sieves containing fine ore from crushed rock, iron ore, limestone, gravel, etc. Alternatively, a hard polyurethane plate with a large number of circular, oval, square, slit, etc. holes is used. Further, in order to reinforce the rubber plate, there are known ones in which a thin metal plate or fabric is used as a core.

(Problem to be solved by the invention) Conventional sieving screens using wear-resistant rubber or polyurethane plates have a relatively large surface friction coefficient of about 1.2, so the sieving screen that adheres to the surface It was difficult for the fine ore to fall off despite the vibration of the screen.In particular, the fine ore attached to the outer periphery of the screen was difficult to fall off because the vibration was smaller than in the center, and the sieved material contained more than 6% moisture. When the sieve is used, the sieve material becomes muddy and sticks to each other, blocking the sieve openings, resulting in a problem in which the effective sieve area decreases to approximately 40%, less than half of the original size, within one week of use. It was hot.

This invention provides a rubber screen in which the powder ore attached to the screen surface easily slides off due to vibration, and the sieve openings are not easily blocked.

(Means for solving the problem) A thin plate of ultra-high molecular weight polyethylene is vulcanized and bonded to the surface of an elastic plate having rubber-like elasticity made of wear-resistant rubber or polyurethane, and a large number of sieve holes are formed on the resulting laminate. to drill.

(Function) Ultra-high molecular weight polyethylene, that is, the molecular weight is 100
Polyethylene with a friction coefficient of 0.12 or more has a very small coefficient of friction of 0.12, and has excellent wear resistance. and,
Since this ultra-high molecular weight polyethylene has thermoplasticity, even if it is heated for vulcanization adhesion, it has the above-mentioned small coefficient of friction and excellent wear resistance after cooling. Therefore, when a thin plate of ultra-high molecular weight polyethylene is installed in a vibrating sieve machine facing upward, the fine ore adhering to the surface immediately slides off due to the vibration, and the fine ore accumulates on the screen surface and turns into sludge. There's nothing to do. Further, since the ultra-high molecular weight polyethylene thin plate described above is thinner than the elastic plate of the main body, it does not impede secondary vibration due to the elasticity of the elastic plate. In addition, the thickness of the above thin plate is 0.5 to 2.0 mm.
is preferable; if it is less than 0.5 mm, it is too thin and easily damaged;
If it exceeds 2.0 mm, it will be too thick and the elasticity of the elastic plate will be canceled by the thin plate, and secondary vibration will no longer occur.

(Example) As shown in Figures 1 and 2, a 1 mm thick thin plate 2 made of ultra-high molecular weight polyethylene with a molecular weight of about 3 million is vulcanized on a 3 mm thick elastic plate 1 made of wear-resistant rubber. Laminated by adhesive, height 10mm, width 6
Three mm sieve holes were drilled in a staggered manner. When this rubber screen was attached to a vibrating sieve machine and used to sieve iron ore with a size of 11 mm or less containing 10% moisture, the effective sieve area after one week was 80% of the original size.
This was approximately twice the effective sieving area of 40% of a conventional rubber screen made only of wear-resistant rubber with a thickness of 4 mm.

(Effects of the invention) This invention consists of a thin plate of ultra-high molecular weight polyethylene laminated on the surface of an elastic plate, so even when it is attached to a vibrating sieve machine and used to sieve iron ore, etc., including fine ore. The powdered ore attached to the surface of the screen easily slips off, so there is little chance of the powdered ore accumulating and blocking the sieve openings. Moreover, since ultra-high molecular weight polyethylene is used, it can be manufactured at a much lower cost than when using fluororesin.

[Brief explanation of the drawing]

FIG. 1 is a partial surface view of an embodiment of this invention, and FIG. 2 is a sectional view taken along the line -- in FIG. 1: elastic plate, 2: thin plate of ultra-high molecular weight polyethylene, 3: sieve mesh.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A rubber screen for sieving, which is made of a laminated plate in which a thin plate of ultra-high molecular weight polyethylene is vulcanized and bonded to the surface of an elastic plate having rubber-like elasticity, with a large number of sieve holes perforated therein. (2) The thickness of the thin plate of ultra-high molecular weight polyethylene is 0.5
The rubber screen for sieves according to claim 1 of the utility model registration claim, which has a diameter of 2.0 mm.