JPH04187273A - Preventing method for clogging sieve in vibrating sieve device and device therefor - Google Patents

Abstract

PURPOSE:To prevent the clogging of a whole sieve with material and to maintain the initial high efficiency of sieving by varying abruptly a tension of the screen surface of the sieve screen. CONSTITUTION:By vibrating the frame bodies 2a, 2b stretched the sieve screen, the material is sieved. The device consists of the sieve screen 3 engaged with peripheral parts 3a, 3b facing each other and in the frame bodies 2a, 2b, a pair of holding part members 10a, 10b holding the sieve screen 3, an energizing means 14 energizing at least one side of the holding part members 14 toward the outside of the holding parts. Also, in the nearly vertical direction against the peripheral part, an actuator 15 is applied to an energized part member 17 counter-faced to the energizing means 14 to make a reciprocating movement. When the energizing part member 17 is exerted a reciprocating movement by driving the actuator 15, the energizing means 14 is pushed and the energizing force toward the outside of the frame body is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a method and device for preventing clogging of a sieve mesh in a vibrating sieve device.

[Prior art and its problems] A vibrating sieve device that sieves the material while transferring it on the upper two sieve nets by vibrating a trough on which a sieve net is stretched has various structures. However, the particle size of this sieve material is small (depending on the material, clogging may occur easily). Some methods prevent clogging by applying impact from below due to the jumping motion of the balls, but in any case, the impact is only partially applied to the sieve mesh, and the sieve mesh can become clogged over the sieve mesh body. cannot be prevented.

In addition, by attaching the tip of a driving rod to the sieve screen and vibrating the drive rod in a direction approximately perpendicular to the surface of the sieve screen, in addition to the vibration for transporting the sieve silk, it is also used to prevent clogging. Some devices have been designed to improve the efficiency of the sieve, but even in such devices, it is difficult to install a large number of drive rods across the sieve mesh body, and as with the impact caused by the balls mentioned above, some parts of the sieve mesh may be damaged. However, it is difficult to prevent clogging across the sieve mesh body.

"Problems to be Solved by the Invention" The present invention has been made in view of the above problems, and can prevent clogging of material throughout the sieve mesh body, and can maintain the initial high sieve efficiency. An object of the present invention is to provide a method and device for preventing clogging of a sieve screen in a vibrating sieve device.

[Means for Solving Problem E] The above object is to provide a vibrating sieve which sieves the material while transferring the material on the sieve net by vibrating the frame on which the sieve net is stretched. A method for preventing clogging of a sieve screen in a vibrating sieve device, characterized in that clogging of the material is prevented by rapidly changing the strain or tension of the mesh surface of the sieve screen. Ru.

Alternatively, the above object is a vibrating sieving device that sieves the material while transferring the material on the sieve net by vibrating a frame on which the sieve net is stretched, in which the sieve nets are opposed to each other. a pair of holding means that engages with the edge portion and holds the sieve screen within the frame; and at least one of the holding means is directed toward the outside of the frame and toward the edge portion. It consists of a biasing device that biases the device in a substantially vertical direction, and an actuator that reciprocates a pressing member facing the biasing device, and when the pressing member is moved forward by driving the actuator, the biasing device is pushed This is achieved by a device for preventing clogging of a sieve screen in a vibrating sieve device, characterized in that the screen is moved to reduce the biasing force directed outward of the frame.

[Function] The screen surface of the sieve net is stretched inside the trough by, for example, sieve net holding members provided at both edges of the trough,
The tension on the screen surface by this holding member is usually such that the resonant frequency is approximately five times or more the frequency of the vibrator for transferring the material on the screen in the vibrating sieve device. In this state, the material transferred by vibration on the sieve screen is normally sieved, and the tension on the sieve screen surface is reduced periodically or by impact at certain time intervals. As a result, the sieve material on the sieve mesh surface is subjected to a large impact force over the entire surface, and in particular, the material adhering to the mesh surface may be forced to the bottom of the sieve due to a sudden change in the tension of the mesh surface, or may be forced to the top of the sieve. It is separated from the adhering material and is transferred onto or under the sieve screen by vibration, and is discharged to the outside as under or on the sieve.

In addition, the holding means generally extends along both side walls of the trough, and means for biasing one side toward the outside of the trough, such as a spring, tensions the sieve screen at a predetermined tension. However, when the actuator is driven to move the pressing member forward and press the biasing means inward of the trough, the biasing force directed outward of the trough is reduced, Therefore, the tension of the sieve net becomes small. If this actuator is driven impulsively, the same effect as described above is achieved, and clogging of the material in the sieve screen can be prevented over the entire sieve screen surface.

[Example] Hereinafter, a device embodying a method for preventing clogging of a sieve screen in a vibrating sieve device according to an embodiment of the present invention will be described with reference to the drawings.

In Fig. 1, the entire vibrating sieve device of this embodiment is shown as (1), and a sieve net (3) is stretched inside the trough (2). is the drive unit mounting plate (
4) is fixed, and a pair of vibration electric motors (5a
l 15b) is installed. Further, the trough (2) is supported by a vibration isolating spring (21) via a pair of front, rear, left and right supports (20). Further, in the right end of the trough (2) in the drawing, an upper sieve material outlet (6) and a lower sieve material outlet (7) are integrally formed. Further, in FIG. 1, a hopper (8) is disposed directly above the left end portion, from which the sieve material is supplied into the trough (2).

In Fig. 2A, there are troughs (
Hook part H along both side wall parts f2al f2b) of 2)
al (3bl) is formed, which is made of stainless steel and is elastically deformable, and also has both side walls (2) of the trough (2).
a) (holding member (10a extending along 2bl)
It engages with the lower end hook portion of lflON as shown. Also, the upper end of this holding member (final flOb) is elastically attached to both side walls f2al (2b) of the trough (2).
is being pressed. A bolt insertion hole is formed approximately in the center of the holding member (10a) flobl, and the bolt (1, 1a) + IIN is inserted into this, and its head engages with the holding member (10a) (1(lbl). In the following, only one of the sieve mesh tensioning devices (lO) disposed opposite to each other will be explained as they have the same configuration.Bolts (
A coil spring (14) for tensioning the sieve mesh is wound around the shaft of the sieve screen, and a spring holder that holds this spring (14) passes through a hole in the member (13) and is attached to the sieve mesh.
The shaft part a) is extended, and the tension of the sieve screen (3) can be adjusted by screwing and tightening a nut f121 to the shaft part protruding from the spring receiver (13). The spring receiver is located opposite the member (13) and the actuator (15)
is provided, from which a cylindrical pressing member (17) protrudes that is reciprocated in the direction of the arrow. The actuator (5) is driven by compressed air, and (16) indicates a tube for supplying and discharging the air. In addition, the main body of the actuator (15) is attached to the trough (2) by the mounting member (18).
(Fixed to the outer surface of 2al f2bl.

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

The vibrating sieve device according to the embodiment of the present invention is constructed as described above, and its operation will be explained next.

In Fig. 2A, both edges of the sieve net (3) are formed as hook parts (3al t3b), and the lower end hook part of the holding member float N0b is engaged with this as shown in the figure. But the bolt fla) f
When the nut (12) screwed onto the shaft of the llbl is tightened, the compressive force of the spring (14) increases, which causes the spring receiver (
13) to the outside of the trough (2). That is, the sieve net (3) has both edges f3al (3b
1 receives a force directed outward from the trough (2), and is stretched within the trough (2) with a certain tension. According to this embodiment, the resonance frequency of the sieve mesh (3) due to this tension is controlled by the vibration motors (5a) (5b).
It is estimated that the driving frequency is approximately five times that of the current driving frequency.

As is well known, when the vibrating electric motor f5a) f5bl is driven, the vibrating electric motor (5al f5
bl is synchronized, thereby producing a linear vibration force in the direction a indicated by the arrow. Therefore, the sieve material cut out from the hopper (8) is transferred over the sieve net (3) to the right in Fig. 1, but during the transfer due to this vibration, the bottom of the sieve is exposed to the mesh of the sieve net (3). through the trough (2)
The bottom wall of the screen is moved to the right in the figure by vibration and is discharged outward from the discharge port (7) as the bottom of the sieve, and the sieve material that has passed over the sieve net (3) is discharged as the top of the sieve. (6) is discharged to the outside. The sieve material as described above performs its functions, but depending on the mesh and moisture content of the sieve material, the sieve mesh (3) can easily become clogged, and when clogging occurs, the material under the sieve is exposed to the outside as the material on the sieve. The efficiency of the sieved material decreases, but
According to this embodiment, the actuator (15) is driven periodically, and the pressing member (17) is pressed against both side walls (2) of the trough (2).
2al moves forward toward f2bl, and the spring receiver moves toward member (1
3) Push. As a result, the nut (12) or spring holder is separated from the member (13), and the sieve screen (3) is removed.
The outward restoring force of the spring (14) that had been applied to the screen no longer acts, and the tension on the sieve screen (3) decreases. As a result, as shown in Figure 2B, the sieve net (3
) becomes slack (exaggeratedly shown), but by returning the pressing member (17) to the return position by driving the actuator ( ) 5 again, the trough (2) is directed outward. When moved again, as shown in Figure 2A,
The spring receiver biases the bolt (14) outward of the trough via the member (13), thereby attaching the holding member (10a) fl
Since the holding member flOa) (10b) is urged outward of the trough (2) through the head of the bolt (llal fllb) engaged with Ob), the sieve screen (3) is again subjected to a large tension. . Actuators like the above (
15), the tension of the sieve screen (3) changes rapidly over the entire area, and the material that is about to adhere to or has adhered to the fine sieve (3) is either on the top of the sieve or on the bottom of the sieve. This can prevent clogging, thus compensating for and sustaining the initial high sieving efficiency. In addition, the actuator (
The reciprocating movement of the pressing member (17) in item 15) may be performed, for example, slowly in the forward direction and rapidly in the backward movement, or it may be possible to make both the forward movement and the backward movement rapid.

3 and 4 show a vibrating sieve device according to a second embodiment of the present invention, and in this embodiment as well, a sieve mesh having the same structure as the first embodiment is installed on the outside of 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 indicated as a whole by (31), and a sieve net (33) is stretched in a trough (32). In Fig. 1, the right end of the trough (32) is located at the sieve material outlet (3
4) and a sieve material discharge port (35) are formed, and a sieve material supply port (36) is formed at the left end. A vibration drive unit mounting plate (3) is attached to the bottom wall of the trough (32).
7) is formed into a single body, and a pair of known vibration electric motors f38al (38bl) are fixed to the rear end of this.

The trough (32) has a pair of front, rear, left and right columns (39a) (
39b), (40al (40b) with anti-vibration spring (4
1) f411 f41) f4]-1. In this embodiment, five sieve mesh vibration drive units (42) are attached to the bottom wall of the trough (32).

An electromagnetic vibration feeder (44) is installed directly above the sieve material paddy supply port (36) formed at the left end of the trough (32), and the sieve material is supplied from the hopper (43) to this feeder. It is now possible to do so. Further, the hopper (43) and the electromagnetic vibration feeder (44) are arranged on a pedestal (45).

Next, details of the sieve mesh vibration drive section (42) will be explained. In this example, these are placed at five locations, but
Since they all have the same configuration, only one sieve mesh vibration drive section (42) will be described. This is equipped with a cup-shaped casing (51) as shown in FIG. 4, whose upper end is connected to the bottom wall part f3 of the trough (32) as shown in FIG.
2a) are fixed by bolts (491f49+) to a pair of angle members (53a) and (53b) fixed by welding, for example. On the bottom wall inside the casing (51), there is a fixed anti-static LiR stone (not shown). A coil is wound and fixed, and a movable core is supported by a pair of springs with a gap between them.The lower end of a rod (56) is fixed to the center of this movable core. This is the fifth
As shown in the figure, it is inserted through an opening (54) formed in the bottom wall of the trough (32), and an increased diameter part (62) as a sieve screen attachment part is formed in one piece at the upper end. , an umbrella member (61) made of metal in the shape of a tap is fixed so as to surround this, and this is attached to the trough (32) of the rod (56).
) is arranged so as to cover the part protruding from the bottom wall part f32a) and the portion under the sieve falling toward the diameter-increasing part (62) integrally formed at the upper end thereof. Also, the sieve rope attachment member (63) is connected to the bolt (
64) is fixed to the increased diameter portion (62). In other words, a screw hole (not shown) is formed in the increased diameter portion (62), and the bolt (64) is inserted into the hole I/insertion hole formed in the mounting member (63), and the screw of the bolt (64) is inserted. The tip of the rod (56) is configured to be clamped and fixed to the sieve net (33) by screwing the rod (56) into a screw hole formed in the increased diameter portion (62). Also trough (3
A cylindrical projection (55) is integrally formed at the peripheral edge of the opening (54) formed in the bottom wall (3zal) of 2), and the rod (56) passes through this. However, between the upper end and the increased diameter part (62), a cylindrical rubber covering member (65) is elastically attached to the increased diameter part and the protrusion (55) at its upper and lower ends. It is attached.

As described above, the rod (56) is completely covered with the material under the sieve.The sieve net (33)
The tension mounting structure for the trough (32) is the same as in the first embodiment.

The vibrating sieve device according to the second embodiment of the present invention is constructed as described above, and its operation will be explained next.

In Fig. 3, a pair of vibration electric motors (38al f38b
When electricity is applied to l, the unbalanced weights rotate synchronously as is known, and the trough linearly vibrates due to the linear vibrating force resulting from the combined force of these forces. It is also assumed that each sieve mesh vibration drive unit (42) is also energized. In Figure 3, the hopper (43)
The sieved material is fed by an electromagnetic vibration feeder (44).
1 to rough (32) are supplied to the sieve material supply ports (36). Since the trough (32) is vibrating linearly, the sieve material supplied from the supply port (36) forms a certain layer thickness and is transferred to the right in FIG. 3 by vibration. During this process, the sieve net (33) separates the sieve into an upper sieve and a lower sieve, and according to this embodiment, five sieve net vibration drive units (42) are fixed to the sieve net. Since the coil is now energized with alternating current, an alternating attractive force is generated between it and the movable core, which causes the rod (56) to vibrate in the vertical direction. Therefore, the sieve screen (33) fixed at its tip is vibrated. Note that this drive unit (4
The frequency of the alternating current applied to the coil in step 2) is set to be sufficiently high, and the sieve net (33) vibrates at a correspondingly high frequency to apply an impact force. It can be sieved sharply into the top and bottom of the sieve without clogging. Therefore, in FIG. 3, the sieve material carried to the right side of the trough (32) is discharged outward from the sieve material outlet (34), and the sieve material is discharged from the sieve material outlet (35).
) is discharged to the outside.

As described above, the material is sieved on the sieve net (33), and the material under the sieve falls onto the bottom wall +32a) of the trough (32). Then, it is transferred over this bottom wall part by linear vibration, and on the way, a cylindrical protrusion (55) is formed on the periphery of the opening of the bottom wall part (32al) of the trough as shown in the figure. Therefore, it is transported around this area and does not enter into this cylindrical protrusion (55).In other words, it does not enter into the casing (51) of the vibration drive unit (42). According to the rod (56), there is a covering member (65) made of cylindrical rubber between the increased diameter part (62) and the projection part (55) at the upper end of the rod (56).
is fixed, so the material under the sieve is completely transferred to the drive unit (4).
2) is prevented from entering the casing (51).

Furthermore, since the umbrella member (61) is attached to cover the increased diameter part (62), the material under the sieve is placed on the bottom wall part (32a,) of the trough (32), avoiding the projection part (55). Since the casing (42) of the drive unit (42) will fall,
51) This not only prevents intrusion into the inside of the sieve, but also extends the life of the rubber covering member (65) (because the material under the sieve is not directly scraped). In addition, the bottom wall of the sieve net (33) and the trough (32) (
32a), but since the cylindrical member (61) is made of rubber, this is absorbed by the deflection and does not have any adverse effect on the vibration of the rod (56).

The vibrating sieve device according to the embodiment of the present invention performs the above-mentioned functions.Next, the replacement operation of the sieve mesh (33) will be explained.

When replacing with a new sieve mesh, insert the bolts (64) from above.
) by loosening all the sieve rope moving parts (4).
From 2) the sieve screen (33) can be removed. On top of this, a bolt (
llal (Natsuto who is screwed on llbl (t21
By loosening and removing (12), you can easily remove the sieve screen (33).
) can be removed. Then, since similar attachment parts are provided on both edges of the new sieve screen, engage the lower end of the holding member flOa (10b) with these as shown in the figure. In addition, bolt (Ila) (spring (Itb+)
14) A new sieve screen can be installed in the trough (32) by tightening the nuts f121 in with the intervening bolts (141) under tension at a predetermined tension. 64
) into the screw hole of the increased diameter part (62), the tip of the rod (56) of each sieve rope moving part (42) can be fixed to the new sieve net (33). According to this embodiment, the casing (51) of the drive section (42)
) is attached to the bottom wall of the trough (3
Since it is fixed to 2a), the sieve screen can be replaced while it is attached, and the sieve screen replacement operation is greatly simplified compared to the conventional method. In addition to the above-mentioned effects, similar to the first embodiment, the clogging prevention effect is achieved.

Although each embodiment of the present invention has been described above, the present invention is of course 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 f101 flol was provided on both sides of the sieve mesh f3) H3), that is, the edge extending in the direction of material transfer due to the vibration of the trough (21 (321)). , instead of this, the sieve net is used in the direction perpendicular to the transfer direction, that is, at the edge along the partition W defining the under-sieve and above-sieve material discharge paths at the left end and right end of the trough (2) in FIG. (3) The tensioning force may be adjusted, and a sieve mesh tensioning device having the same structure as described above may be provided.

Further, in the above embodiment, tensioning devices ft01 [o) are provided on both side walls of the trough t2)
) (32) to tension the sieve net (31+331), but one may be fixed and only the other tension or relax the sieve net. Alternatively, as shown in FIG. 6, a rubber (80) may be attached to the tip of the pressing member (17) to eliminate the gap between the spring receiver and the member (13).In this case, the pressing member ( 17) When the splinter bracket and the member (13) are made of metal, it is possible to eliminate the impact sound when there is a collision.

[Effects of the Invention] As described above, according to the method and device for preventing clogging of a sieve mesh in a vibrating sieve device of the present invention, clogging of material can be prevented over the entire sieve mesh, so that the initial high sieve content can be reduced. can maintain the same efficiency.

[Brief explanation of the drawing]

FIG. 1 is a side view of a vibrating sieve device according to a first embodiment of the present invention, FIGS. 2A and 2B are enlarged sectional views of main parts of the same device, and FIG. 3 is a vibrating sieve device according to a second embodiment of the present invention. A side view of the sieving device, FIG. 4 is an enlarged sectional view of the same device, FIG. 5 is an enlarged sectional view along the line ■-■ in FIG. 4, and FIG. It is a diagram. In the figure, (1)...... Vibrating sieve device (
2) ・・・・・・・・・・・・
Rough (3) ・・・ ・・・
・・Furui net (10)
・ ・ ・ Tension clothing
Place final N0bl ・ =-= Hold
Parts (llal (llb) = - = Bolt (12)...
・・・・・・ Sut (13)
・・・・・・・・・Spring holder is a component (14)
・・・・・・・・・ Coil spring (15)・・・・・・・・・
・・・・・・ Actuator (17)・・・・・・
・・・・・・・・・ Pressure Department Assistant Manager Yasuo Saka

Claims (2)

[Claims] (1) In a vibrating sieve device that sieves the material while transferring the material on the sieve net by vibrating a frame on which a sieve net is stretched, tension on the screen surface of the sieve net A method for preventing clogging of a sieve screen in a vibrating sieve device, characterized in that clogging of a material is prevented by rapidly changing the sieve mesh. (2) In a vibrating sieving device that sieves the material while transferring the material on the sieve net by vibrating a frame on which a sieve net is stretched, opposing edges of the sieve net a pair of holding means that engages with the frame and holds the sieve net within the frame, and at least one of the holding means is directed outward of the frame and approximately toward the edge of the frame. a biasing means for biasing in a vertical direction;
an actuator that reciprocates a pressing member facing the urging means; when the pressing member is moved forward by driving the actuator, the urging means is pushed;
A device for preventing clogging of a sieve screen in a vibrating sieve device, characterized in that the biasing force directed outward of the frame is reduced.