JPH0448864Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Field of Industrial Application) The present invention relates to a rubber screen for a vibrating sieve, which is mainly used to sieve ore, coke, crushed stone, and the like. (Prior art) Conventionally, screens for fine grains have mainly been made by laminating rope-like bodies with thin rope diameters with polyurethane elastomer coated around the tensile body in a vertical and horizontal manner, and welding all the contact points. Square or rectangular rubber screens were used. However, when this type of rubber screen has square mesh openings, the meshes become clogged with objects to be sorted, and when separating powdery materials with a high moisture content, the square meshes become clogged with adhesion. Of course, if the diameter of the rope is made smaller and the aperture ratio is increased, clogging will be reduced, but the strength will be reduced, leading to rope breakage accidents, and the service life of the rope will be significantly shortened due to wear. On the other hand, making the openings rectangular (slot type) is effective in preventing clogging, but in the case of the vertical slot type, the strength of the net decreases and rope cutting accidents are more likely to occur, and in the case of the horizontal slot type, the horizontal sides are long. As a result, there is a high frequency of collisions between processed materials.
The wear of the horizontal rope is severe and the wear life is significantly reduced. In addition, when the slot ratio (long side length/short side length) of the slot type becomes large, the powdery material passing through the sieve screen often contains flat objects to be sorted that should not pass through. Therefore, there was a problem of lowering the sieving efficiency. Therefore, an attempt was made to deal with and solve this problem, and in 1977, a screen was developed that had a structure in which only predetermined points among all the contacts laminated vertically and horizontally were welded, and other contacts were not welded. It was proposed in No. 184787. (Problem to be solved by the invention) However, the screen according to the above proposal,
A certain degree of effectiveness can be expected in preventing clogging and preventing the passage of flat particles, but on the other hand, (a) the coreless vertical rope stretches during use, and the openings are no longer square, resulting in slots (rectangular openings). (b) There are fewer welding points, so the welding force is insufficient and the welded part peels off. (c) The vibration of the vertical rope increases, causing the welded part to peel off. Problems such as rope breakage can occur, and when the distance between welded contacts increases, the load acting on the weld increases, resulting in weld separation, and if the vertical rope is coreless, the rope may break. This may lead to accidents such as Furthermore, when the interval between the welded contacts is reduced, the free vibration of the vertical rope becomes smaller, resulting in a significant reduction in the clogging prevention effect. Therefore, the present invention further considers these issues and
By separating the upper layer small diameter rope and the lower layer small diameter rope to form slot openings, and joining the large diameter rope that is the support rope-like element to the small diameter rope, the upper layer vertically slotted opening and the lower layer By integrating the horizontally elongated slot openings, the small diameter rope forming the mesh can easily obtain secondary vibrations in both the upper and lower layers, preventing clogging and reducing sieving efficiency, as well as preventing welding and separation under heavy loads. The purpose is to prevent accidents from occurring. (Means for Solving the Problems) Therefore, in order to meet the above objectives, the present invention is characterized in that the rubber screen for the vibrating sieve is made of tensile material made of twisted threads such as steel cords or chemical fibers, and the surrounding area is Rope-like bodies with various cross-sectional shapes covered with rubber-like elastic materials such as polyurethane are coated with the upper layer parallel to the direction of movement of the objects to be sorted, the lower layer in the direction perpendicular to the direction of movement of the objects to be sorted, and both the upper and lower layers are Two types of rope-like bodies with different thicknesses are laminated at a predetermined pitch, and the intersecting parts of the small diameter ropes are in contact with each other, and the remaining intersecting parts are welded and joined. . Note that claims 2 to 4 indicate the most effective range of the above configuration, in which the gap between the small diameter rope intersections is 0.25 to 2.0 times the small diameter pitch, and the ratio of the rope diameters of the large diameter rope and the small diameter rope is 1.5 to 4.0. The most effective range is the range of 3 to 20 for the rope opening ratio of the large diameter rope and the small diameter rope, respectively. (Function) When the rubber screen constructed as described above is used, the vertically elongated slot openings in the upper layer and the horizontally elongated slot openings in the lower layer are integrated, and the small diameter rope forming the mesh can easily obtain secondary vibrations in both the upper layer and the lower layer. In addition to effectively preventing clogging, the flat particles that have passed through the upper layer are blocked by the small-diameter ropes in the lower layer that intersect with each other, and are thrown onto the screen, thereby preventing a decrease in sieving efficiency. In addition, since the large and small rope-like elements have a tensile material, they are strong in terms of strength, and in the welded part, by welding the large and small rope diameters, the welded area becomes larger than the welded area with the small rope diameter, and the To provide an efficient sieve screen that can obtain welding force and prevent accidents such as welding separation and cutting even when a large load is applied. (Embodiments) Hereinafter, embodiments of the present invention will be described further based on the accompanying drawings. FIGS. 1 and 2 are partial views of the screen according to the present invention. In the figures, 1 is an upper layer large-diameter rope arranged in the flow direction of the material to be sorted, and 2 is an upper layer arranged in parallel in the flow direction. 3 is a lower-layer large-diameter rope in a direction perpendicular to each rope; 4 is a small-diameter rope;
is also a small-diameter rope in the lower layer, and each of these rope-like elements is made of a well-known twisted yarn made of aromatic polyamide, aliphatic polyamide, polyester, steel cord, etc., although not particularly shown. It is composed of a rope-like element whose core is a tensile material and whose periphery is covered with a rubber elastic material such as a wear-resistant polyurethane elastic material having thermoplastic properties.The cross section is usually circular, but there are special cases where the cross section is circular. The shape is not limited to this, and may be any other shape such as an ellipse, a square, or a polygon. In the upper layer, each of these rope-like elements has a plurality of ropes, three in the figure, between adjacent large-diameter ropes 1.
A plurality of small diameter ropes 2 are arranged in parallel in the flow direction of the material to be sorted, and a plurality of small diameter ropes 4, three in the figure, are perpendicular to each of the ropes 1 and 2 in the upper layer between adjacent large diameter ropes 3 in the lower layer. The small-diameter ropes 2 and 4 are arranged in a cross-layered manner, and the intersecting parts of the small-diameter ropes 2 and 4 are in a non-contact state with a gap h, but the remaining intersecting parts are joined by heat welding 5 to form a network structure as a whole. screen. In this case, adjacent large diameter ropes 1, 1 in the upper layer
The distance between them, that is, the pitch B' is the same as the distance between the adjacent large-diameter ropes 3, 3 in the lower layer perpendicular to this, that is, the pitch B'.
The pitch A between adjacent small diameter ropes 2, 2 in the upper layer is not necessarily the same as the pitch A between adjacent small diameter ropes 4, 4 in the lower layer.
It does not necessarily have to be the same as A′. In addition, in the screen having the above configuration, each rope diameter D of the large diameter ropes 1 and 3 and the small diameter ropes 2 and 4 is
The ratio of d, D/d, is preferably 1.5 to 4.0, which corresponds to the above-mentioned distance B between the large diameter ropes,
This is because as B' increases, the force acting on the welded portion 5 increases, so increasing the large rope diameter D and increasing the welding area is effective in obtaining a large welding force. In addition, during stacking, the gap h that exists between the upper layer small diameter rope 2 and the lower layer small diameter rope 4 is 0.25 to 2.0 of the pitch A or A' of the small diameter rope, that is, h = 1/4A to 2A or 1/4A' to 2A' is effective, and when this gap h is small, the free vibration in the vertical direction of the large and small ropes 1 and 2 in the flow direction is inhibited, and the clogging prevention effect is reduced. On the other hand, if the gap h is too large, the flat particles are completely separated from the upper ropes 1 and 2 in the flow direction.
, the effect of preventing the passage of flat particles is reduced. Furthermore, the ratio of the opening of the large diameter ropes 1 and 3 to the opening of the small diameter ropes 2 and 4, that is, B/A or B'/
A range of 3 to 20 is valid for A'. If this ratio is small, the free vibrations of both large and small diameter ropes 1 and 2, which are the rope-like bodies in the flow direction, will be small, and the clogging prevention effect will be significantly reduced. Conversely, when the above ratio increases, the load applied to the welded portion 5 increases, making it easy for weld separation and rope breakage to occur. Therefore, by considering each of the above-mentioned conditions at the time of design, it becomes possible to create a more appropriate rubber screen. Next, we will explain how a sieve machine was created with the following specifications based on the present invention, and how crushed stone was actually processed. Sieve machine specifications Size: 600mm width x 2400mm length Amplitude: 12mm Frequency: 950 cycles/min Processed material Name: Crushed stone Processing amount: 10T/H The results are as shown in Table 1.

【table】

[Table] As can be seen from the above table, the screen of the present invention achieved good results with less clogging and less loss of efficiency due to the passage of flat particles than the conventional screen. (Effect of the invention) As described above, the present invention has two types of rubber screens in which the rope bodies are laminated crosswise in the traveling direction of the objects to be sorted and in the right angle direction, that is, in the vertical and horizontal directions, in which the upper and lower layers have different thicknesses. The intersecting parts of the small-diameter ropes are kept in a non-contact state, and the remaining intersecting parts are welded and joined, and the vertically long slot openings in the upper layer and the horizontally long slot openings in the lower layer are integrated. The small-diameter ropes that form the mesh are separated from each other to form slot openings, so the small-diameter ropes are more likely to obtain secondary vibrations in both the upper and lower layers, which not only prevents clogging but also
The flat particles that have passed through the upper layer are blocked by the small-diameter ropes in the lower layer and are repelled onto the screen, which has the remarkable effect of preventing a decrease in sieving efficiency and improving the sieving effect. In addition, as mentioned above, both the large and small rope-like bodies have tensile elements and are strong, and furthermore, at the welding part, large and small ropes are welded together, making it possible to obtain a large welding force, which can withstand large loads. However, accidents such as welding separation and cutting do not occur, and an efficient sieve screen can be obtained. Note that the specific ranges of the gap between the intersections of the small diameter ropes, the ratio of the rope diameters of the large and small ropes, and the ratio of the rope openings of the large diameter ropes and the small diameter ropes described in claims 2 to 4 are all within the practical use of the screen. Increase your sexuality,
This makes it more effective.

[Brief explanation of the drawing]

FIG. 1 is a partial plan view showing an example of a rubber screen according to the present invention, and FIG. 2 is a front view of the same screen. 1... Upper layer large diameter rope, 2... Upper layer small diameter rope, 3... Lower layer large diameter rope, 4... Lower layer small diameter rope, 5... Welded part, A, A'... Between small diameter ropes. Spacing, B, B'... Pitch between large diameter ropes,
h...Gap between small diameter rope intersections.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Rope-like bodies with various cross-sectional shapes made of twisted threads such as steel cords or chemical fibers as tensile bodies and covered with rubber-like elastic bodies such as polyurethane,
The upper layer is parallel to the direction of movement of the objects to be sorted, and the lower layer is perpendicular to the direction of movement of the objects to be sorted, and the upper and lower layers each have two types of rope-like bodies with different thicknesses, which are interlaced and laminated at a predetermined pitch. A rubber screen for a vibrating sieve, characterized in that among all the intersecting parts, the intersecting parts of small diameter ropes are in a non-contact state, and the remaining intersecting parts are welded and joined. 2. The rubber screen for a vibrating sieve according to claim 1, wherein the gap at the intersection of the small diameter ropes is in a range of 0.25 to 2.0 times the pitch of the small diameter ropes. 3 The ratio of the rope diameters of the large diameter rope and the small diameter rope is
The rubber screen for vibrating sieves according to claim 1 or 2, which has a molecular weight in the range of 1.5 to 4.0. 4. The rubber screen for a vibrating sieve according to claim 1, 2 or 3, wherein the ratio of rope openings between the large diameter rope and the small diameter rope is in the range of 3 to 20.