JPS5847236B2 - Rubber screen with excellent durability - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a highly durable rubber screen.
In particular, materials with abrasive properties such as crushed stone, iron ore or sintered ore, etc.
This is a rubber screen that is used to screen out large amounts of powder, grains, and/or agglomerates.

In order to prevent noise in this type of application, rubber screens, that is, sieves made of perforated sheets of rubber or urethane (hereinafter referred to as plate sieves), are usually used, and sometimes cored or non-core urethane rods are used. A lattice-like sieve (hereinafter referred to as a lattice sieve) is also used, in which the rods with cores perpendicular to the sieves are arranged horizontally, and the sieves are vertically arranged to form sieves between them. Even in the case of falling down, the sieve openings are placed on the sieve surface of the workpiece to be sieved so as to ensure the horizontal projected area of the sieve openings, that is, the effective passage area under the various vibration motions applied to the sieve. The vertical length is along the flow direction.

In this invention, we focus on the fact that both of these picture-type sieves are made of rubber-like elastic materials such as rubber or urethane, and are simply referred to as rubber screens.

Now, in order to extend the wear life of such a rubber screen, it is necessary to increase the thickness of the sheet or the outer diameter of the rod, but on the other hand, this increases the likelihood of clogging.
The performance of the sieve is impaired.

In this way, from a performance standpoint, the sieve portion is determined by the thickness of the sheet for plate sieves, and the outer diameter of the rods, especially cross rods for lattice sieves, depending on the size of the sieve openings, so the abrasiveness of the material to be processed is determined. As a result, a sufficient wear life cannot be obtained and the sieve must be replaced frequently, which impedes the operating efficiency of the sieve device.

In general, the factors that affect the wear life of this type of rubber screen include the type of material to be processed, the amount of supply, the structure of the sieve's attachment to the vibrator, and the particle size distribution, especially the size of particles mixed in the material to be processed. The influence of grains and lumps is significant.

Therefore, the more relatively large-sized particles and lumps are mixed in the material to be treated, the more likely the wear of the sieve will be accelerated.

The sheet thickness of the conventional plate sieve and the horizontal diameter of the lattice sieve are preferably approximately 50% or less of (A+B)/2, depending on the size of the sieve, that is, the width A and length B of the sieve. Since clogging is low at 20 to 30%, this was used as a rough guideline and was determined in consideration of the above-mentioned wear factors.

Note that the length B of the sieve mesh is preferably about four times the width A or less.

This invention solves the problems that could not be avoided in the prior art described above without clogging the sieve, and has a much longer sieve than the conventional sieve for processing highly abrasive materials. We propose an improved sieve that has a long wear life and has excellent sieve performance.

This invention relates to a sieve having sieve openings for sieving powder, grains, and/or lumps, in which a plurality of sieve openings are sandwiched between the sieving openings at both ends and the sieving openings adjacent thereto. A highly durable rubber screen with vertical ribs.

This invention is achieved by providing a second vertical rib with a slightly shorter length between the taller vertical ribs, or by providing this second vertical rib over the entire screen. ,
Further extension of wear life can be expected.

In this invention, by supporting coarse grains and lumps during the progress of the sieving movement between the long vertical ribs that sandwich a plurality of sieve openings, the occurrence and growth of abrasion that starts at the edges of the sieving openings is prevented. To avoid.

When the second vertical rib is provided in this invention, the protrusion of coarse grains or lumps bridge-supported by the tall vertical rib or the coarse grain or lump supported on one side by the tall vertical rib By providing this second vertical rib along all the sieve openings, the entire sieve that passes through the sieve openings can be removed. Effectively protects the sieve edges from the abrasive action of the top.

In this invention, powder, grains, and/or lumps that pass through the sieve openings and are to be placed under the sieve flow freely down between the vertical ribs that sandwich the sieve openings; Since the vertical ribs are supported by the tilting of the ribs and do not get caught in the sieve holes, clogging is advantageously avoided and the performance of the sieves is significantly improved.

In addition, the provision of vertical ribs increases the rigidity of the sieve, making it possible to increase the amount of feed, leading to improved operational efficiency, and further increasing efficiency by improving operating efficiency by extending wear life. This invention is illustrated in FIGS. 1 and 2 with respect to different embodiments of a plate sieve and a lattice sieve.

In the figure, 1 is a screen, 2 is a tall vertical rib, and 3 is a second vertical rib.

For the plate sieve shown in Figure 1, if AxB is 6 x 25 threads and the sieve grain size is 5m, the reference thickness of the porous sheet indicated by T is approximately 8 threads, which is the limit of performance. As shown in C, the lattice muntin 4 that surrounds the sieve openings 1 along with the vertical ribs 2 and 3 is approximately equal to the thickness of the porous sheet, and thereby the thickness per unit length in the longitudinal direction of the porous sheet is , about 80-90 kg/m, horizontal installation supports tension.

The tall and tall ribs 1 are provided with an interval P of approximately 50% of the maximum grain or agglomerate size, approximately 50 mm in the above-mentioned size, and the height H of the ribs 1 is as follows: It is preferable to set it to about 40% or more of the interval P, which is about 20 intervals in this example.

Further, it is preferable that the apex angle θ of the rib 1 is 300 or more in order to prevent clogging.

The height h of the second rib 3 is the average side length of the sieve, A+B/
Approximately 25% or less of 2 or about 4 in this example is desired from the viewpoint of preventing clogging between the ribs, and this rib can be used without increasing the standard thickness T of the rubber sheet. It increases the apparent thickness of the sieve by the height and serves to extend the wear life.

The second rib is preferably chamfered along its longitudinal direction as shown in the figure.

An example of the results of sifting sintered ore using a test sieve fabricated with the dimensions shown above is as follows.

Particle size distribution 100~50TILrIL50%50~5mr
IL 40% 15% 10% Supply amount 800 tons per hour Sieve frame size Width 2100mm, length 6000mm
Vibration frequency: 900 cycles per minute Particle size: A conventional plate sieve consisting of a 5-filter sieve mesh of 6 mm x 25 mm formed on a rubber porous sheet with a thickness of 8 mrIL reaches the end of its life when the throughput of sintered ore is 25,000 tons. However, when using the above embodiment of this invention, the throughput was 105. It can be used up to OOO tons, and no clogging occurred during this time.

In this example, the wear life is improved by more than four times.

In this manner, the rubber screen of the present invention is most effective when handling objects with a large maximum size when the sieve has a small particle size.

In the example shown in Fig. 2, the sieve opening 1 is arranged with rubber or urethane horizontal openings 6, which can be reinforced with wire cords 5, in the vertical size B of the sieving opening 1, and perpendicular to this, the Large diameter vertical rods I are spaced apart from each other by P, and small diameter vertical rods 8 which separate the horizontal size A of sieve mesh 1 from and to the vertical rods 7 are arranged between them. By suitably combining both the horizontal and vertical rods, it can be constructed in the form of a lattice sieve.

In this case, the outer diameter of the large-diameter vertical rod 7, which also functions as a tall rib, is about 30% of the interval P, and the small-diameter vertical rod 8, which functions as a second rib, and the horizontal rod 6 have an AXB of 6 mm.
It is preferable to set it as around 7-10 mrrt in the size of about X25mm.

The vertical rod 7.8 is a vertically elongated oval or
It may have a polygonal cross section, and sometimes a horizontal rod with a rectangular cross section may be combined with a dog or small vertical rod of a trapezoidal cross section to form the appearance shown in FIG.

In the example shown in FIG. 1, it is also obvious that a modification in which wire cord reinforcement is provided inside the lattice muncture 4 is also obvious.

In this example, the sieve content is shown as an example of vertically long sieves along the flow direction of the powder, grains, and/or lumps to be processed, but it is not essential that the sieves are vertically long. ,
Depending on the application, for example, if there are many long and narrow objects in the material to be treated, the sieve mesh may be square, or even if some long and narrow objects are mixed in, the sieve mesh may be horizontally long with respect to the flow direction of the material to improve efficiency.

Thus, according to the present invention, even if the workpiece to be subjected to vibration sieving has particularly high abrasiveness,
It is possible to significantly improve the wear life of the sieve without worrying about clogging during operation, and to improve the efficiency of this type of work.

[Brief explanation of drawings]

1 and 2 are perspective views of essential parts showing an embodiment of the present invention. 1...Sieve mesh, 2,7...Tall ridge, 3゜8...Second rib.

Claims (1)

[Claims] 1. In a sieve having sieve openings for processing powder, grains, and/or lumps, a plurality of sieving openings are interposed between the sieving openings at both ends and the sieving opening adjacent thereto. A highly durable rubber screen with tall vertical ribs. 2. The rubber screen according to claim 1, further comprising a second vertical rib having a slightly shorter length and interposing a screen between the higher vertical ribs. 3. The rubber screen according to claim 2, wherein the second vertical ribs are provided on all screen openings.