JPH0315185Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a sieve frame that can form a uniform screen in an extremely short time.

(Prior art) Conventionally, in order to remove foreign substances, filtrate, and deliquify materials such as powders and liquids, the materials to be treated are placed on a sieve with a mesh, and the material is vibrated using, for example, a vibration motor. Processing takes place. If the screen is torn during processing, workers must immediately stop operation, replace the torn sieve, and restart operation. The torn sieve
The netting will be relined separately to prepare for the next use.

However, with conventional methods, companies specializing in sieving work usually use a large number of sieving machines, so workers are busy replacing broken meshes that occur one after another, which requires a lot of time and effort. It becomes quite something. Also, a high degree of skill is required to re-stretch the netting evenly. Incidentally, when we investigated the cause of the tearing of the net, we found that it was caused by a structural defect in the netting mechanism, rather than due to sticking or abrasion due to processed materials, as was previously thought. It became clear that there were more people.

Therefore, in order to avoid the above-mentioned problems, the present applicant previously filed an application for a "sieve frame" (Japanese Patent Application No. 36444/1982) having the structure shown in FIG.

The sieve frame with this configuration has excellent performance in that it can form a uniform mesh in a much shorter time than with conventional methods and can withstand continuous operation for a much longer time.

(Problem to be solved by the invention) However, during use, the expanded portion 6 of the sieve frame is expanded by pressurized gas, and as shown in FIG. front wall 7
It has become clear that since the net 3 is pressed against the contact portion 8, there is a risk that the net may be torn due to wear.

The present invention provides a sieve frame that can uniformly reline the screen in an extremely short time regardless of individual differences, eliminates screen tearing extremely effectively, and enables continuous operation for long periods of time.

(Means for Solving the Problem) The present invention has a fixing part 4 for fixing the mesh 3 to the peripheral edge 2 of the sieve frame 1, and the peripheral wall 5 is expanded by injecting gas or liquid, and the upper end of the fixing part 4 is provided. In a sieve frame in which an extended part 6 is installed that applies tension to the net passing under the fixed part from the part to the fixed part, a gap A formed by the extended part 6 and the fixed part front wall 7 is This sieve frame is characterized in that even when tension is applied to the mesh 3 due to the expansion of the portion 6, a gap is maintained such that the mesh 3 does not come into contact with the front wall 7 of the fixed portion.

(Function) The meshing mechanism of the present invention will be explained in more detail based on FIG. 1 when applied to a sieve frame 1 of a Dalton type vibrating screen. FIG. 1 shows a schematic view of the sieve frame seen from above before the screen 3 is stretched. Further, FIG. 2 shows a cross-sectional view of the sieve frame shown in FIG. 1 taken at a point indicated by A.

In FIG. 1, a ring-shaped sieve frame 1 is provided with a circumferential wall 5 at its upper part in the circumferential direction, as shown in FIG.
Further, an expanded portion 6 is provided in a groove portion 8 along the peripheral wall portion 5.

This expansion part expands when pressurized gas or liquid is introduced into the air valve 10 provided in the expansion part,
It has the function of applying tension to the net that passes from its upper end to the lower end of the fixed part.

The material and form of the expansion part 6 that can be applied to the present invention are not limited to rubber tubes, and may be appropriately selected as long as they can give the desired tension to the net, such as rubberized cloth or synthetic sheets. Can be used. The air valve 9 is installed in an air valve hole 12 provided in the sieve frame as shown in FIG.

Next, as shown in FIG. 2, the fixing part 4 is a holding ring having a lower surface corresponding to the upper surface shape of the peripheral edge part 2, and is configured to sandwich the net and fix it with a cap bolt 12. However, the fixing part 4 is not limited to these, and can be used as appropriate as long as it can sufficiently fix the net so that it does not come off when the net is stretched by expanding the expansion part. However, in order to securely fix the net, it is better to provide an uneven groove in the circumferential direction at the contact area between the peripheral edge part that fixes the net and the fixing part. If the grooves (mountains) are at least 2 mm or more, the fixing effect of the net will be even better.

Therefore, the present invention provides the expansion part 6 and the fixing part 4.
The gap 8 formed by the front wall 7 of the fixed part is such that the mesh 3 does not always come into contact with the front wall 7 of the fixed part even when tension is applied to the mesh 3 due to the expansion of the expansion part 6. Although it is essential to maintain a gap,
The manner in which this gap is provided is determined in relation to the maximum expansion size of the expansion portion 6.

In addition, the sieve frame having the above structure can be separated from the main body and configured into a cartridge type so that the screen can be replaced more easily.

It should be noted that the net tensioning mechanism of the present invention is difficult to apply to nets with excessively high rigidity, since appropriate tension is provided by the expanded portions as described above. Therefore, for example, industrial meshes made of wire materials such as stainless steel, galvanized iron, hard steel, brass, copper, bronze, aluminum, Monel, nickel, silk, nylon, synthetic fibers such as polyester, polyethylene, and Tetron, and carbon fibers. The number of stitches is 60 meshes or more, and the line size is SWG (STANDARD-WIRE-GAUGE).
It is preferably applied to items numbered 35 or higher in the standard.

The procedure for setting the screen on the sieve frame will be further explained.

As shown in FIG.
When the net is inserted between the rubber tube and the cap bolt 12 and tightened with the cap bolt 12, the net is fixed by passing from the upper end of the rubber tube through the lower end of the presser ring, as shown by the dashed line. Thereafter, pressurized air is introduced from the air valve 9 to gradually expand the rubber tube 6, and the net is gradually stretched to a predetermined tension as shown by the two-dot chain line. In addition, to remove the screen from the sieve frame,
You can perform the above steps in reverse.

(Effects) If the sieve frame equipped with the meshing mechanism according to the present invention is used, the meshing can be changed uniformly without individual differences. Moreover, the rubber tube cushion eliminates the severe vibrations that the net undergoes during use and the slack that occurs due to plastic deformation of the net itself.
This reduces the number of tears in the net and enables continuous operation for long periods of time. In addition, since it can be fixed with only a few bolts, there is no need to tighten several dozen bolts as in the conventional method, which of course greatly reduces the burden on workers. Even when tension is applied to the net 3, the net 3 does not always come into contact with the front wall 7 of the fixed part, so an excellent effect is obtained in that the life of the net can be extended.

Furthermore, if the sieve frame is of a cartridge type with respect to the sieve, it is possible to obtain the effect that the screen can be replaced even more easily.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment in which the meshing mechanism of the present invention is applied to a sieve frame of a Dalton type vibrating screen. FIG. 2 is an enlarged sectional view of the sieve frame shown in FIG. 1 taken at the position of the air valve. FIG. 3 is a diagram showing a schematic configuration of a conventional sieve frame. 1: Sieve frame, 2: Peripheral part, 3: Net, 4: Fixed part (holding ring), 5: Peripheral wall part, 6: Expansion part,
7: Front wall of fixed part, 8: Groove, 9: Air valve, 10:
Top, 11: Air valve hole, 12: Cap bolt, A: Gap.

Claims (1)

[Claims for Utility Model Registration] 1. A fixing part 4 for fixing a screen 3 to a peripheral edge 2 of a sieve frame 1; In a sieve frame in which an extended part 6 is installed that applies tension to the mesh passing under the screen, a gap A formed by the extended part 6 and the front wall 7 of the fixed part is
The sieve frame is characterized in that even when tension is applied to the mesh 3 due to the expansion of the expanded portion 6, a gap is maintained that is sufficient to prevent the mesh 3 from coming into contact with the front wall 7 of the fixed portion. 2. The sieve frame according to claim 1, wherein the sieve frame is of a cartridge type with respect to the sieve. 3 The contact area between the peripheral edge and the fixing part that fixes the net is
The sieve frame according to claim 1, having a fitting uneven structure in the circumferential direction, and the grooves (mountains) of the unevenness are at least 2 mm or more.