JP3049760B2 - Method and apparatus for preventing clogging of sieve net in vibrating sieve device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for preventing clogging of a sieve mesh in a vibrating screen device and an apparatus therefor.

[Conventional technology and its problems]

Various types of vibrating sieve devices are known which vibrate a trough on which a sieve mesh is stretched to sift the material while transferring the material on the sieve mesh. Although the particle size of the material is small and some materials are easily clogged, conventionally, for example, the impact from below caused by the jumping motion of the ball accommodated in the frame disposed below the sieve mesh However, in any case, the sieve mesh is partially impacted, and the clogging of the sieve mesh cannot be prevented over the entire sieve mesh.

Also, the tip of the drive rod is attached to the sieve net, and this drive rod is vibrated in a direction substantially perpendicular to the surface of the sieve net to prevent clogging in addition to vibration for transfer to the sieve net or to sieve. Although the efficiency is improved, it is difficult to mount a large number of drive rods throughout the sieve mesh even in such a device, and the clogging of the sieve mesh may be partially caused similarly to the impact by the ball. Although it can be prevented, it is difficult to prevent clogging across the sieve net.

[Problems to be solved by the invention]

The present invention has been made in view of the above problems, and a method for preventing clogging of a sieve mesh in a vibrating sieve device capable of preventing material clogging over the entire sieve mesh and maintaining the initial high sieving efficiency as well as the same. It is intended to provide a device.

[Means for solving the problem]

The object described above is to provide a vibrating sieve in which a sieve mesh is strained while vibrating a frame body stretched to transfer the material on the sieve mesh, thereby clogging the sieve mesh in a vibrating sieve apparatus. In the prevention method, the tension of the mesh surface of the sieve mesh is reduced and then changed back to its original value. A method for preventing clogging of a sieve mesh in a vibrating screen device, wherein clogging of a material is prevented by force.

Alternatively, the object is to clog the sieve mesh in a vibrating sieve device that sifts the sieve mesh while vibrating a frame that is stretched to transfer the material on the sieve mesh. In the prevention device, a pair of holding means for engaging opposite edges of the sieve mesh and holding the sieve mesh in the frame body, and at least one of the holding means is disposed outside the frame body. A biasing means for biasing the pressing member in a direction substantially perpendicular to the edge and an actuator for reciprocating a pressing member opposed to the biasing means. When moved, the urging means is pushed to reduce the urging force toward the outside of the frame, and the pressing member is moved backward by the actuator to drive the pressing member. By the restoring force of the means, the urging force of the holding means toward the outside of the frame is increased, at least the speed of increasing the urging force is sufficiently large, and the clogging of the sieve mesh is reduced. The present invention is achieved by a device for preventing clogging of a sieve mesh in a vibrating sieve device, which is released by an impact force when the mesh surface of the sieve mesh is tightened due to a sudden increase in power.

[Action]

The mesh surface of the sieve mesh is stretched in the trough by, for example, a sieve mesh holding member provided at both edges of the trough, and the tension of the mesh surface by the holding member is usually used in a vibrating sieve device. The tension is set so that the resonance frequency is about 5 times or more the frequency of the vibrator for transferring the above material. In such a state, the material conveyed by vibration is usually sieved on the sieve mesh, but the tension on the sieve mesh surface is increased from small to large periodically or by impact at certain time intervals. Change. As a result, the sieve material of the sieve mesh receives a large impact force as a whole, and particularly, the material adhering to the eyes of the sieve is moved down the sieve by a sudden increase in the tension of the mesh surface, or as the sieve material is increased. It is released from the adhesion, and is transferred by vibrating on or under the sieve mesh and discharged to the outside as under or above the sieve.

The holding means generally extends along both side walls of the trough, but means for urging one of them toward the outside of the trough, for example, tensioning the sieve mesh with a predetermined tension by a spring. However, when the pressing member is moved forward by the forward drive of the actuator and the biasing means is pressed inward of the trough, the biasing force directed outward of the trough is reduced. The tension of the sieve mesh is small. Thereafter, if the actuator is rapidly driven backward, an impact force is applied to the mesh surface by the same operation as described above, and clogging of the material in the sieve mesh can be prevented over the entire mesh surface.

〔Example〕

Hereinafter, an apparatus embodying a method for preventing clogging of a sieve net in a vibration sieve apparatus according to an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, the whole vibration sieve device of this embodiment is shown by (1), a sieve net (3) is stretched inside the trough (2), and a bottom wall portion of the trough (2) is provided. The drive unit mounting plate (4) is fixed, and a pair of vibration motors (5
a) (5b) is installed. The trough (2) is supported by a vibration-proof spring (21) via a pair of front, rear, left and right columns (20). In the figure of the trough (2), an upper material discharge port (6) and a lower material discharge port (7) are integrally formed at the right end. In FIG. 1, a hopper (8) is disposed immediately above the left end, and sieve material is supplied from the hopper (8) into the trough (2).

In FIG. 2A, hooks (3a) are provided along both side walls (2a) and (2b) of the trough (2) at both edges of the sieve net (3).
(3b) is formed on it, made of stainless steel and elastically deformable, and also on both side walls (2a) (2b) of the trough (2)
As shown in the drawing, engages with lower end hook portions of holding members (10a) and (10b) extending along the axis. The upper ends of the holding members (10) (10b) elastically press the side walls (2a) (2b) of the trough (2). Holding member (10a) (1
0b) has a bolt insertion hole at the approximate center.
The bolts (11a) and (11b) are inserted through the bolts, and the heads thereof are engaged with the holding members (10a) and (10b). Hereinafter, the sieve mesh tensioned state (10) disposed opposite to both sides has the same configuration, and only one of them will be described. A coil spring (14) for tensioning a sieve mesh is wound around the shaft of the bolt (11a), and the bolt (11a) passes through a hole of a spring receiving member (13) that holds the spring (14). 11a) is extended, and a nut (1) is attached to the shaft protruding from the spring receiving member (13).
By screwing and tightening 2), the tension of the sieve net (3) can be adjusted. An actuator (15) is provided so as to face the spring receiving member (13), from which a cylindrical pressing member (17) is reciprocally driven in the direction of the arrow to protrude. The actuator (15) is driven by compressed air, and (16) shows the supply / discharge tube. The main body of the actuator (15) is a mounting member (18)
Thus, the trough (2) is fixed to the outer side surfaces of both side walls (2a) and (2b).

The sieve mesh tensioning device (10) according to the present invention is configured as described above, but these are used as a left and right pair, and a total of four are fixed to both side walls of the trough (2).

The vibration sieving apparatus according to the embodiment of the present invention is configured as described above. Next, this operation will be described.

In FIG. 2A, both sides of the sieve mesh (3) are formed as hook portions (3a) (3b), and the lower end hook portions of the holding members (10a) (10b) engage with the hook portions as shown in the drawing. However, when the nut (12) screwed to the shaft of the bolt (11a) (11b) is tightened, the compressive force of the spring (14) increases, which causes the spring support (13) to 2) It is a force for urging outward. That is, the sieve net (3) receives a force toward the outside of the trough (2) at both edges (3a) and (3b), and with a certain tension, the trough (2).
It will be stretched inside. According to the present embodiment, the resonance frequency of the sieve net (3) due to this tension is set to be about five times the drive frequency of the vibration motors (5a) (5b).

When the vibration motors (5a) and (5b) are driven, the vibration motors (5a) and (5b) are synchronized by the centrifugal force of the unbalanced weight, as is well known, so that a linear vibration force is generated in a direction indicated by an arrow in FIG. Occurs. Therefore, the sieve material cut out from the hopper (8) is transported to the right on the sieve mesh (3) in FIG. 1, and the mesh of the sieve mesh (3) is located below the sieve during the transfer due to the vibration. The bottom wall of the trough (2) is transferred to the right side in the figure by vibration through the through-hole, and discharged to the outside through the discharge port (7) as a sieve.
The sieve material that has passed through the sieve net (3) is discharged to the outside from the discharge port (6) as the sieve. The sieving operation as described above is performed. However, depending on the mesh or moisture of the sieving material, clogging easily occurs in the sieving net (3), and when clogging occurs, the lower part of the sieving material is discharged to the outside as upper sieving material. Although the sieving efficiency also decreases, according to the present embodiment, the actuator (15)
Is driven, the pressing member (17) moves forward toward both side walls (2a) and (2b) of the trough (2), and presses the spring receiving member (13). As a result, the nut (12) is detached from the spring receiving member (13), so that the outward restoring force of the spring (14) applied to the sieve mesh (3) does not act, and the tension of the sieve mesh (3) is reduced. Becomes smaller. This causes the sieve mesh (3) to become slack as shown in FIG. 2B (shown exaggeratedly), but the actuator (1
When the pressing member (17) is returned to the reversing position by the driving of 5), that is, when the pressing member (17) is moved outward of the trough (2), the spring receiving member (13) is again turned on as shown in FIG. 2A.
Urges the bolts (11a) and (11b) outward of the trough through the holding members (10a) and (10b) and engages with the holding members via the heads of the bolts (11a) and (11b). (10a) (1
0b) is urged outward from the trough (2), so that the sieve net (3) again receives great tension. The driving of the actuator (15) as described above causes a sudden change in the tension of the sieve net (3) over the whole, and the sieve is subjected to an impact force when the mesh surface of the sieve net (3) is suddenly tensioned. The material adhering to or adhering to the mesh of the net (3) is released as above or below the sieve, preventing clogging, and thus, in the initial stage,
It compensates and maintains high sieving efficiency. In addition,
The reciprocating movement of the pressing member (17) of the actuator (15) may be, for example, slow in forward movement and sharp in backward movement, or both forward movement and backward movement may be rapid.

FIGS. 3 and 4 show a vibrating screen device according to a second embodiment of the present invention. In this embodiment, a sieve mesh having the same structure as that of the first embodiment is provided outside both side walls of the trough. The device is fixed.

FIG. 3 shows a vibrating sieve device according to a second embodiment of the present invention, which is generally indicated by (31), and a sieve net (33) is stretched in a trough (32). In FIG. 1, an upper material discharge port (34) and a lower material discharge port (35) are formed at the right end of the trough (32), and a sieve material supply port (36) is formed at the left end. ing. A vibration driving unit mounting plate (37) is integrally formed on the bottom wall of the trough (32), and a pair of known vibration motors (38)
a) (38b) is fixed.

The trough (32) is a pair (39a) (39
b), (40a) and (40b) with anti-vibration springs (41) (41) (41) (4
1) is supported through. In the present embodiment, five sieve mesh vibration drive units (42) are mounted on the bottom wall of the trough (32). Immediately above the sieve material supply port (36) formed at the left end of the trough (32), an electromagnetic vibration feeder (4
4) is provided, to which sieve material is supplied from a hopper (43). Also hopper (43)
And the electromagnetic vibration feeder (44) is disposed on a gantry (45).

Next, the details of the sieve mesh vibration driving section (42) will be described. In the present embodiment, these are arranged at five places,
Since both have the same configuration, only one sieve mesh vibration driving section (42) will be described. This is provided with a cup-shaped casing (51) as shown in FIG. 4, and its upper end is fixed to the bottom wall (32a) of the trough (32) by, for example, welding as shown in FIG. A pair of angle members (53
a) It is fixed to (53b) by bolts (49) and (49). A fixed-side electromagnet (not shown) is fixed to the bottom wall portion of the casing (51) by winding a coil, and a movable core is supported by a pair of springs with a gap therebetween. The lower end of the rod (56) is fixed to the center of the movable core, and this is connected to the trough (3) as shown in FIG.
2) through the opening (54) formed in the bottom wall,
A diameter increasing portion (62) as a sieve mesh attachment portion is integrally formed at an upper end portion, and an umbrella member (61) made of a cup-shaped metal is fixed so as to surround the diameter increasing portion (62). The part protruding from the bottom wall part (32a) of the trough (32) of 56) and the diameter-increasing part (6
It is arranged to cover the falling down of the sieve toward 2). Further, a sieve mesh mounting member (63) is opposed to the umbrella member (61) with a sieve mesh (33) interposed therebetween.
Are fixed to the increased diameter portion (62) by bolts (64).
That is, a screw hole (not shown) is formed in the increased diameter portion (62), and the bolt (64) is inserted through the bolt insertion hole formed in the mounting member (63), and the screw portion of the bolt (64) is inserted. By screwing into the screw hole formed in the diameter increasing part (62),
The distal end of the rod (56) is configured to be clamped and fixed to the sieve net (33). A cylindrical projection (55) is integrally formed on the periphery of the opening (54) formed in the bottom wall (32a) of the trough (32), through which the rod (56) penetrates. However, a covering member (65) made of a cylindrical rubber is provided between the upper end portion and the diameter increasing portion (62) at the upper end portion and the lower end portion thereof. It is elastically fastened to.

As described above, the rod (56) is completely covered with the material below the sieve. The structure for attaching the sieve net (33) to the trough (32) is the same as that of the first embodiment.

The vibration sieve device according to the second embodiment of the present invention is configured as described above, and the operation thereof will be described below.

In FIG. 3, when a pair of vibration motors (38a) and (38b) are energized, the unbalanced weight rotates synchronously as is well known,
The trough vibrates linearly with the linear vibration force due to these combined forces. It is also assumed that power is supplied to each sieve mesh vibration drive unit (42). In FIG. 3, the sieve material from the hopper (43) is removed by the electromagnetic vibration feeder (44) into the trough (32).
Is supplied to the sieve material supply port (36). Trough (32)
Is vibrating linearly, the sieving material supplied from the supply port (36) forms a certain layer thickness and is transferred to the right in FIG. 3 by vibration. In this process, a sieve net (3
3) The upper screen is divided into the upper screen and the lower screen. According to the present embodiment, five screen driving units (42) are fixed to the screen. Since electricity is supplied, an alternating suction force is generated between the movable core and the movable core, whereby the rod (56) vibrates in the vertical direction. Therefore, the sieve mesh (33) fixed at its tip is vibrated. The frequency of the alternating current supplied to the coil of the drive unit (42) is assumed to be sufficiently high, and the sieve net (33) vibrates at a high frequency in response thereto to give a shocking force. The sieve material is efficiently and sharply sieved without clogging into the upper and lower sieves. Therefore, the trough (3
The upper material of the sieve conveyed to the right of 2) is discharged outward from the upper material discharge port (34), and the lower sieve material is discharged to the outside through the lower material discharge port (35).

As described above, the material is sieved on the sieve net (33), and the material under the sieve falls on the bottom wall (32a) of the trough (32). Then, the trough is transferred by linear vibration on the bottom wall. In this process, the bottom wall (32a) of the trough has a cylindrical projection (55) formed at the periphery of the opening as shown in the figure. Therefore, it is transported around this area and does not enter the cylindrical projection (55). That is, it does not enter the casing (51) of the vibration drive section (42). Further, according to the present embodiment, since the covering member (65) made of cylindrical rubber is fixed between the enlarged diameter portion (62) at the upper end of the rod (56) and the projection (55), the rod (56) is completely Lower material is the casing (51) of the drive unit (42)
Inside is prevented. Furthermore, since the umbrella member (61) is attached so as to cover the diameter-increasing portion (62), the material under the sieve falls onto the bottom wall portion (32a) of the trough (32) so as to avoid the protrusion (55). This not only prevents the drive section (42) from entering the casing (51), but also extends the life of the rubber covering member (65) (the material under the sieve is directly covered). Because there is no). The sieve net (33) and the bottom wall (32a) of the trough (32) vibrate relative to each other, but this is absorbed by this bend because the tubular member (61) is made of rubber. There is no adverse effect on the vibration of the rod (56).

The vibration sieving apparatus according to the embodiment of the present invention performs the above-described operation. Next, the replacement operation of the sieving net (33) will be described.

When replacing with a new sieve net, bolts (6
4) Easy to loosen all screen drive (4
From 2) the sieve mesh (33) can be removed. The bolts (11a) and (11b) through which the holding members (10a) and (10b) engaged at both edges of the sieve mesh (33) are inserted.
The sieve mesh (33) can be easily removed by loosening and removing the nuts (12) and (12) screwed into the nut. Next, since similar attachment portions are provided at both edges of the new sieve net, the lower ends of the holding members (10a) (10b) are engaged with the holding members (10a) (10b) as shown in the figure, and the bolts (11a) ( By tightening the nuts (12) and (12) with the springs (14) and (14) interposed in 11b), a new sieve mesh can be attached in the trough (32) with a predetermined tension. Then, the bolt (64) is screwed into the screw hole of the diameter-increasing portion (62) with each mounting member (63) interposed therebetween, whereby the tip of the rod (56) of each sieve driving unit (42) is replaced with a new sieve. Can be fixed to the net (33). According to the present embodiment, the casing (51) of the drive section (42) is fixed to the bottom wall section (32a) of the trough via a pair of angle members (53a) (53b) as shown in the figure by bolts (49). Has been
The sieve net can be replaced while it is attached, and the exchange operation of the sieve net is greatly simplified as compared with the related art. In addition to the effects described above, a clogging prevention effect can be obtained as in the first embodiment.

As described above, each embodiment of the present invention has been described.
The present invention is not limited to these, and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiment, the sieve mesh tensioning device (10) is provided on both sides with respect to both edges of the sieve mesh (3) (33), that is, the edges extending in the direction of material transfer by the vibration of the troughs (2) and (32). (10) is provided, but in place of this, a partition wall which defines a material discharge passage below the sieve and a material discharge passage above the sieve at the left end and the right end in FIG. 1 of the trough (2). The tension of the sieve mesh (3) may be adjusted at the edge along W, and these may be provided with a sieve mesh tensioning device having the same configuration as described above.

In the above embodiment, the tensioning devices (10) and (10) are provided on both side walls of the troughs (2) and (32), and the troughs (2) and (3) are provided on both sides.
Apply a biasing force toward the outside of 2) and sieve net (3)
Although (33) is tensed, one may be fixed and the sieving net may be tensioned or relaxed by the other alone. In addition, as shown in FIG. 6, rubber (80) may be attached to the tip of the pressing member (17) to eliminate the gap between the pressing member (17) and the spring receiving member (13). In this case, the pressing member (1
When the metal 7) and the spring receiving member (13) are made of metal, it is possible to eliminate the impact noise at the time of collision.

〔The invention's effect〕

As described above, according to the method for preventing clogging of a sieve mesh in the vibrating sieve device of the present invention, the material can be prevented from being clogged over the entire sieve mesh, so that the initial high sieving efficiency can be maintained. Can be.

[Brief description of the drawings]

FIG. 1 is a side view of a vibration sieving apparatus according to a first embodiment of the present invention, FIGS. 2A and 2B are enlarged cross-sectional views of essential parts of the apparatus, and FIG. 3 is a vibration screen according to a second embodiment of the present invention. FIG. 4 is an enlarged sectional view of a main part of the sieve device,
FIG. 5 is an enlarged cross-sectional view taken along line VV in FIG. 4, and FIG. 6 is a cross-sectional view showing a modification of the main part of the above embodiment. In the figures, (1) ... vibrating sieve device (2) ... trough (3) ... sieve net (10) ... tensioning device (10a) (10b) ... holding member (11a) (11b) ... Bolt (12) Nut (13) Spring receiving member (14) Coil spring (15) Actuator (17) Pressing member

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B07B 1/00-1/62

Claims (2)

(57) [Claims] 1. A clogging of a sieve net in a vibrating sieve device which sifts a sieve net while vibrating a frame body stretched to transfer the material on the sieve net. In the prevention method, the tension of the mesh surface of the sieve mesh is reduced and then changed back to its original value. A method for preventing clogging of a sieve mesh in a vibrating sieve device, wherein clogging of a material is prevented by force. 2. A clogging of a sieve mesh in a vibrating sieve device which sifts the sieve mesh while vibrating a frame which is stretched to transfer the material on the sieve mesh. In the prevention device, a pair of holding means for engaging opposite edges of the sieve mesh and holding the sieve mesh in the frame body, and at least one of the holding means is disposed outside the frame body. A biasing means for biasing the pressing member in a direction substantially perpendicular to the edge and an actuator for reciprocating a pressing member opposed to the biasing means. When moved, the urging means is pushed to reduce the urging force toward the outside of the frame, and the urging means moves the urging means by the backward drive of the actuator. By the original force, the urging force of the holding means toward the outside of the frame is increased, and at least the speed at which the urging force is increased is sufficiently large, and the clogging of the sieve mesh reduces the urging force. A device for preventing clogging of a sieve mesh in a vibrating sieve device, wherein the sieve mesh is released by an impact force when the mesh surface of the sieve mesh is tightened due to a sudden increase.