JPH0889896A - Rubber screen - Google Patents

Abstract

PURPOSE: To improve screen efficiency by waving largely the whole elastic screen by the vibration of a screening machine by making the screen of a rubber screen two-layer structure in the rubber screen which is suitable for a vibrating screen which screens agglomerate and powder of ore, chemicals, etc. CONSTITUTION: Transverse ropes 7' with or without a core are arranged on longitudinal ropes 6' in which the periphery of a tension member is coated with elastomer, and the crossing parts are bonded with an elastic net, wire gauze, a screen plate to form a lower screen 2, which is attached to a hook fixing part 5. An upper screen 1 is formed in a similar manner. The upper and lower screens 1, 2 are bonded through a belt-shaped sheet 3, and at the positions where the lower surface of the upper screen 1 faces the upper surface of the lower screen 2, the belt-shaped sheets 4, 4' are bonded at more than one position to form two layer structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber screen, and more particularly to a lump of ore, crushed stone, coke, chemicals, etc.
The present invention relates to a rubber screen for a vibrating screen that efficiently screens powdery materials.

[0002]

2. Description of the Related Art At present, as a rubber screen of this type, a rope-shaped element body (hereinafter abbreviated as a rope), which is mainly covered with a polyurethane elastic body around a tensile body, is vertically and horizontally cross-laminated to form a total crossing portion. Welded, open square or rectangular rubber screens were used. 4 However, in this type of rubber screen, when the openings are square, there is a problem that clogging that the processed material clings to the mesh and clogging that powder material adheres to and accumulates on the rope, reducing the sieving efficiency. was there.

On the other hand, when the opening is rectangular (hereinafter abbreviated as a slot type), it is effective in preventing clogging, but in the vertically long slot type, the net strength is lowered and a rope cutting accident easily occurs, Further, in the horizontally long slot type, since the horizontal side is long, the frequency of collision of the processed objects is high, and the lateral rope is abraded so much that the wear life is significantly reduced. In the case of slot type, if the slot ratio (length of long side / length of short side) becomes large, the flattened processed material that should not originally pass into the powdery material that passes through the sieve net is mixed. However, there was a problem that the sieving efficiency decreased.

Therefore, attempts have been made to deal with such a problem and solve the problem, and two types of ropes having different thicknesses in the upper and lower layers are cross-laminated at a predetermined pitch,
A rubber screen for a vibrating screen has been proposed in Japanese Utility Model Laid-Open No. 2-108779, which has a structure in which the crossing portion of the small-diameter rope among all the crossing portions is in a non-contact state and the remaining crossing portion is welded and joined.

[0005]

However, although the rubber screen according to the above proposal can be expected to have some effect in preventing clogging and passage of flat particles, coal powder,
A bad object that contains a lot of water such as limestone powder and hardens after attachment does not sufficiently prevent clogging, and the rope surface area becomes larger than that of a small diameter rope. Since the horizontal rope that increases and has a constant tension has less free vibration than the vertical rope, powder particles are more likely to adhere to the rope, and it adheres to the vertical and horizontal large diameter ropes and the horizontal small diameter rope. There was a problem that powdery substances were deposited, and they gradually grew toward the center of the mesh, eventually closing the mesh and causing clogging.

Thus, the present invention has been achieved by paying attention to the various facts as described above and making various investigations on these improvements. The rubber screen has a two-layer laminated structure. As a result of the improvement, vibration of the sieving machine causes the entire elastic screen to undulate, and the powdery substances that try to adhere to the rope are repelled, and even malicious processed substances that contain a lot of water such as coal powder and limestone powder adhere It is an object of the present invention to provide a rubber screen that is highly efficient in sieving without clogging or light clogging.

[0007]

To achieve the above object, the present invention is characterized in that a twisted yarn such as a steel cord or a chemical fiber is used as a tensile body, and the periphery thereof is an elastic body such as polyurethane or rubber. The cored rope-shaped elements with various cross-sections covered with are aligned in parallel in the horizontal direction, and the cored or uncore rope-shaped elements are laminated vertically on top of each other, and then the layers are interlaced. A screen for a vibration sieving machine, in which the widthwise end of a lower layer screen made of an elastic net, a metal mesh, or a screen plate having a mesh of any shape is attached to a hook engaging portion, and the upper side of the lower layer screen. The core consists of elastic nets with cores or coreless rope-shaped elements orthogonal to each other in the vertical and horizontal directions and laminated and intersected at the intersections, or an elastic screen plate with openings of arbitrary shape. The screen has a two-layer structure in which the upper screen and the lower screen are joined and integrated at the upper end via a wear-resistant strip-shaped sheet, and the lower surface of the upper screen and the upper surface of the lower screen are resistant to corresponding positions. This is a rubber screen in which an abradable strip-shaped sheet is joined to a plurality of places in the width direction.

In this rubber screen, the opening of the lower screen is 1.2 to 5.0 times the opening of the upper screen, and the gap between the upper screen and the lower screen is 1. The range of 0 to 3.0 is the most effective range. Further, the configuration of the upper layer screen is not limited to a screen in which ropes are laminated and crossed vertically and horizontally, and is made of an elastic body such as rubber or polyurethane, and has openings of any shape such as circle, square, rectangle, and polygon. It is also effective to configure with a screen plate.

[0009]

When the rubber screen having the above-described structure is used, the upper screen is joined to the lower screen only at the upper end over the entire width. Therefore, the entire upper screen is subjected to secondary vibration and the entire upper screen undulates. From the above, the powdery substances that try to adhere to the rope and the lumps that try to stick into the mesh are largely repelled, not only effectively preventing the upper screen from clogging, but also the lumps that have passed through the upper screen. , The powder of the lower layer screen is larger than that of the upper layer screen, so that it easily passes, and the powdery substances that try to adhere to the rope of the lower layer screen are easily knocked off by the flap of the upper layer screen, and the upper and lower layer screens. No clogging with sticking or clogging It is possible to provide a down.

[0010]

Embodiments of the rubber screen for a vibrating screen according to the present invention will be described below with reference to the accompanying drawings. 1 is a partial perspective view of a rubber screen according to the present invention, FIG. 2 is a side view of FIG. 1 seen from the direction of arrow X, and FIG.
FIG. 1 is a front view as seen from the direction of FIG. 1, in which 1 is an upper layer screen, 2 is a lower layer screen, and the upper layer screen 1 is a vertical rope-shaped element 6 (hereinafter abbreviated as a vertical rope) and a horizontal rope-shaped element. It is composed of an element body 7 (hereinafter abbreviated as a horizontal rope).

The vertical and horizontal ropes 6, 7 are steel cords,
A round, oval, or polygonal cross section in which twisted yarn with good flexibility such as aromatic polyamide, aliphatic polyamide, polyester, etc. is used as a tensile body, and the surrounding area is covered with an elastic body such as abrasion-resistant polyurethane having rubber or rubber. It is a cored rope of any shape. The vertical and horizontal ropes 6 and 7 may be coreless ropes made of only elastic body such as abrasion-resistant polyurethane or rubber having no tensile body.

On the other hand, the lower layer screen 2 is composed of a vertical rope 6'and a horizontal rope 7 ', which is a cored rope or a coreless rope similar to the vertical rope 6,
On the other hand, the horizontal rope 7'is a cored rope. The vertical and horizontal ropes 6, 7 and 6 ', 7'are laminated and crossed on the horizontal ropes 7, 7'by making the vertical ropes 6, 6'perpendicular to each other, and the crossing portions are welded.

Both ends in the width direction of the lower layer screen 2 are firmly attached and fixed by hook locking portions 5, and the upper layer screen 1 and the lower layer screen 2 are wear-resistant at the upper ends (starting portions in the conveying direction of the conveyed object). They are joined by a polyurethane strip-shaped sheet 3, and more specifically, the horizontal rope 7 of the upper layer screen 1 and the upper surface of the strip-shaped sheet 3, and the vertical rope 6 ′ of the lower layer screen 2 and the lower surface of the strip-shaped sheet 3 are welded to each other. The lower layer screen 2 is firmly joined and integrated only in the upper end over the entire width in the width direction.
(Fig. 2)

A plurality of abrasion-resistant polyurethane belt-shaped sheets 4 and 4'are provided so as to extend in the lengthwise direction at several positions in the width direction. The belt-shaped sheet 4 is used as the upper layer screen 1.
The strip-shaped sheet 4'is welded to the lower surface of the lower screen 2
Is welded to the upper surface of the strip-shaped sheets 4 and 4 ', and the strip-shaped sheets 4 and 4'are installed at almost the same positions in the tension direction (width direction). It is made. (Fig. 3)

The gap H existing between the upper layer screen 1 and the lower layer screen 2 is 1.0 to 3.0 times the aperture A of the upper layer screen 1, that is, H = (1.0 to 3.0) A. When the gap H is less than 1.0 times, the lumps trying to pass through the upper layer screen 1 are obstructed by the lower layer screen 2 and the sieving efficiency is lowered. Further, when the gap H is 3.0 times or more, the effect of knocking off the accumulated powder adhering to the vertical ropes 6 ′ and the horizontal ropes 7 ′ of the lower layer screen 2 due to the waviness of the upper layer screen 1 is weakened, and thus the clogging prevention effect is reduced. To do.

Further, it is important that the openings A'of the lower layer screen 2 are such that lumps and powders that have passed through the upper layer screen 1 easily pass through the lower layer screen 2, and the opening of the lower layer screen 2 is the upper layer screen. It is necessary to be larger than the opening size of 1, but practically the upper layer screen 1
1.2 to 5.0 times the eye opening A, that is, A ′ = (1.2
A range of up to 5.0) A is suitable. In addition, when the aperture A'of the lower layer screen 2 is less than 1.2 times, the upper layer screen 1
It is difficult for the lumps and powders that have passed through the lower layer to pass through the lower layer screen, which causes clogging, and when the opening A'is 5.0 times or more, the net strength is extremely reduced and accidents such as net rupture occur. And other problems such as

The cross-sectional shape of the rope is usually circular, but it is not limited to a circular shape, and may be an arbitrary shape such as an elliptical shape, a square shape, or a polygonal shape. Further, the joining method of the upper layer screen 1 and the lower layer screen 2 is usually performed by joining and unifying by welding. However, the joining method is not limited to welding, or may be a joining method by fastening with bolts and nuts sandwiching the upper and lower sides with an iron plate. Also, the lower screen 2
The vertical and horizontal ropes are not limited to ropes, and the same effect can be obtained by punching screen plates such as wire mesh, polyurethane, rubber, and iron plate. In this case, the joining sheet 3 at the upper end and the gap H are formed. The strip-shaped sheets 4 and 4'are used by a method of bonding or fastening and fixing with bolts and nuts.

Further, the upper layer screen 1 is not limited to the rope, and if the entire upper layer screen can obtain a large secondary vibration and exhibits the same effect, it is made of an elastic material such as rubber or polyurethane and has a circular shape. A screen plate having openings of any shape such as square, square, and rectangle may be used.

The length of the upper layer screen 1 in the vertical direction is such that the lower end of the upper layer screen 1 is pushed toward the upper end portion by the corrugation of the upper layer screen to prevent the processed material from directly contacting the lower layer screen. About 5% from screen 2
It is necessary to keep it long.

Further, in FIG. 1, the upper layer screen is joined across the entire width at the upper end without dividing in the screen width direction. However, in view of the vibration condition of the vibrating screener and the shape of the processed material, a larger upper layer screen is used. When waviness is required, it is effective to divide the width of the upper layer screen 1 into a plurality of pieces,
It is also possible to divide the upper-layer screen 1 into an optimum number according to various conditions such as the support frame interval of the sieving machine main body and the band-shaped sheet position.

Next, a situation in which a sieving machine having the following specifications is produced based on the present invention and actually processed will be described. Sieve specifications Size: 600 mm Width * 2400 mm Length Amplitude: 12 mm Vibration frequency: 950 cycles / min Processed product name: Coal Moisture: About 15% Supply: 8 T / H The results are shown in Table 1.

[0022]

[Table 1]

As can be seen from Table 1, the rubber screen of the present invention has much less clogging than the conventional rubber screen, and the result of good sieving efficiency was obtained.

[0024]

As described above, according to the present invention, by virtue of the upper screen made of an elastic material such as rubber or polyurethane, which easily obtains secondary vibration, being fixedly joined to the lower screen only at the upper end, the vibration of the vibrating screener main body is reduced. As a result, the whole upper layer screen is greatly wavy, and the lumps and powders that are stuck or stick to the upper layer screen are repelled on the net, and the lumps that have passed through the upper layer screen are opened on the lower layer screen. Since it is sufficiently larger than the opening of the upper screen, it can easily pass through, and the powdery substances that try to adhere to the lower screen are knocked off by the large waves of the upper screen, so coal powder, limestone powder, etc. Even a malicious object that contains a large amount of water and hardens after attachment does not become clogged. Thwart down, a marked effect that makes it better sorting effect. The ratio of the openings of the upper layer screen and the lower layer screen and the specific range of the gap between the upper layer screen and the lower layer screen increase the practicality of the screen and make it more effective.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing a main part of a rubber screen of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a front view of FIG.

[Explanation of symbols]

 1 Upper screen 2 Lower screen 3 Strip sheet 4 Strip sheet 4'Strip sheet 5 Hook locking part 6 Vertical rope of upper screen 6'Vertical rope of lower screen 7 Horizontal rope of upper screen 7'Horizontal rope of lower screen A Upper screen Opening A'Opening the lower layer screen H Gap between the upper and lower screens

Claims (5)

[Claims] 1. A cored rope-shaped body of various cross-sections, in which twisted yarns such as steel cords and chemical fibers are used as a tensile body and the periphery thereof is covered with an elastic body such as polyurethane or rubber, are arranged in parallel in a lateral direction. , Composed of a core plate or coreless rope-shaped element which is orthogonally crossed in the longitudinal direction and laminated and intersected, and an elastic net formed by joining the intersecting parts, a wire mesh, or a screen plate having openings of arbitrary shape A screen for a vibration sieving machine in which the widthwise end of the lower layer screen is attached to the hook locking portion, and a core-shaped or uncore rope-shaped element is orthogonally crossed in the vertical and horizontal directions on the upper side of the lower layer screen to be laminated and interlaced. ,
An elastic net formed by joining the intersecting parts or an upper layer screen composed of elastic screen plates having openings of arbitrary shape is laminated to form a two-layer structure, and the upper layer screen and the lower layer screen are abrasion-resistant strip-shaped sheets at their upper ends. The rubber screen is characterized in that the abrasion-resistant belt-like sheet is joined to the lower surface of the upper layer screen and the upper surface of the lower layer screen at corresponding positions on the lower surface of the upper layer screen at a plurality of positions in the width direction. 2. The rubber screen according to claim 1, wherein the opening of the lower layer screen is in the range of 1.2 to 5.0 times the opening of the upper layer screen. 3. The rubber screen according to claim 1, wherein the gap between the upper layer screen and the lower layer screen is in the range of 1.0 to 3.0 times the aperture of the upper layer screen. 4. The upper plate screen is a screen plate made of an elastic material such as rubber or polyurethane and having openings of arbitrary shapes such as a circle, a square, a rectangle and a polygon.
The rubber screen according to claim 1. 5. The rubber screen according to claim 1, wherein the upper layer screen is divided into a plurality of sheets in the width direction.