JP5191068B1 - Vibrating sieve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent discharge of powder that has not been sieved, and to enable continuous operation without requiring user operation during sieving. A simple vibrating sieve.
SOLUTION: A vibrating sieve according to the present invention sifts powder, which is arranged to divide a space in the container 2 into a container 2 for storing powder, a vibrating means 3 for vibrating the container 2, and a space in the container 2. A sieve mesh 4, a discharge passage 5 for discharging the powder in the upper space 2 a above the sieve mesh 4, and a bag-like balloon member 6 that can be expanded and contracted by fluid pressure. When the balloon 6 is inflated, the discharge path 5 is closed, and when the balloon member 6 is contracted, the discharge path 5 is opened.
[Selection] Figure 1

Description

  The present invention relates to a vibrating sieve used for classification and selection of powder.

  2. Description of the Related Art As a conventional technique, there is widely known a vibrating sieve configured so that powder is supplied onto a sieve screen and is vibrated so that the powder passes through the sieve mesh and the powder that does not pass through. A general vibrating sieve is provided with a discharge port on the upper side of the sieve mesh through which powder that does not pass through the sieve mesh is discharged to the outside, and is configured to perform powder sieving and powder discharge at the same time. ing. However, when a discharge port that is always open is provided above the sieve mesh, there is a problem that even powder that should have passed through the sieve mesh is discharged from the discharge port during sieving. Therefore, in order to prevent the powder that has not yet been sieved from being discharged from the discharge port, a vibrating sieve configured to be able to open and close the discharge port is known (Patent Documents 1 and 2).

  The vibrating sieve according to Patent Document 1 includes a sliding gate that opens and closes electromagnetically at the discharge port. After supplying the powder, the sieve screen is vibrated with the discharge port closed for a certain period of time. , And then the discharge port is opened to discharge the powder.

  However, in the vibrating screen according to Patent Document 1, there is a possibility that the slide mechanism is fixed due to the powder entering the sliding portion of the gate and accumulating. On the other hand, when lubricating oil is applied to the sliding portion in order to realize a smooth slide, there is a possibility that powder contaminated with lubricating oil is discharged from the discharge port. In addition, there is a possibility that the slide mechanism may be worn and damaged by vibration, and therefore, there is a possibility that a gap is generated in the gate and the sealing property cannot be maintained, and powder that is not sieved is eventually discharged.

  On the other hand, the vibrating screen according to Patent Document 2 includes a hinged door gate that is manually opened and closed by the user at the discharge port, and after supplying the powder, the powder is sieved by vibrating with the discharge port closed, After sieving is completed, the user manually opens the discharge port and discharges the powder.

  However, similarly to the one according to Patent Document 1, this vibrating sieve has a possibility that the hinged door may be fixed by the powder entering the hinge of the hinged door and accumulating. On the other hand, when lubricating oil is applied to the hinge to realize smooth movement, there is a possibility that powder contaminated with lubricating oil is discharged from the discharge port. In addition, there is a possibility that the slide mechanism may be worn and damaged by vibration, and therefore, there is a possibility that a gap is generated in the gate, the airtightness cannot be maintained, and the unsieved powder is discharged. Furthermore, the user has to manually open and close the discharge port when sieving is completed.

Japanese Utility Model Publication No. 3-26384 Japanese Utility Model Publication No. 57-99769

  Therefore, the problem to be solved by the present invention is to prevent the discharge of powder that has not been sieved, and to enable continuous operation without requiring any user operation during sieving. It is an object of the present invention to provide a vibration sieve that does not break down and does not break down and has a long life.

The present invention has been made to solve the above problems, and the invention according to claim 1 is characterized in that a container for storing powder, a vibrating means for vibrating the container, and a space in the container up and down. A sieve mesh arranged to divide the powder, a discharge path for discharging the powder in the space above the sieve mesh to the outside, and a bag-like balloon member that can be expanded and contracted by fluid pressure And when the balloon member is inflated, the discharge path is closed, when the balloon member is contracted, the discharge path is opened, and when the balloon member is contracted, the discharge path is opened from the lower part in the section of the discharge path. It is a vibrating sieve characterized by this.

According to the first aspect of the present invention, a vibrating sieve that reliably prevents the discharge of powder that has not been sieved, has a long service life that is unlikely to fail , and can discharge powder smoothly from a container. Can be provided.

According to a second aspect of the invention, a vibrating screen according to claim 1, wherein the balloon member is inflated and deflated by air pressure.

According to the second aspect of the present invention, it is possible to provide a vibrating sieve capable of keeping the environment to which the powder is exposed clean.

The invention of claim 3 is a vibration sieve of claim 2, the air pressure acting on the balloon member is characterized in that it is the sequence control.

According to the third aspect of the present invention, it is possible to provide a vibrating sieve capable of discharging powder that has been automatically screened without requiring time measurement or operation by a user.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to prevent the discharge | emission of the powder which is not sifted reliably, it is hard to break down and can provide a long-life vibrating sieve.

It is a fragmentary sectional side view which shows the vibration sieve which concerns on this invention. It is a partial section front view showing a vibration sieve concerning the present invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, (a) is a cross-sectional view when the balloon member is contracted, and (b) is a cross-sectional view when the balloon member is expanded. It is a vibration sieve which concerns on this invention, Comprising: It is a fragmentary sectional front view which shows the vibration sieve which has a balloon member of another example. It is a pneumatic circuit diagram for operating the balloon member of the vibration sieve according to the present invention. It is a time chart of the air pressure control for operating the balloon member of the vibration sieve concerning the present invention.

  Next, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are preferred embodiments of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. As long as there is no description of the effect, it is not restricted to these aspects.

  An embodiment of a vibrating sieve according to the present invention will be described with reference to FIGS. FIG. 1 is a partial cross-sectional side view showing a vibration sieve according to the present invention, and FIG. 2 is a partial cross-sectional front view showing the vibration sieve according to the present invention. 3A and 3B are cross-sectional views taken along line AA in FIG. 1. FIG. 3A is a cross-sectional view when the balloon member is contracted, and FIG. 3B is a cross-sectional view when the balloon member is expanded. FIG. 4 is a partial cross-sectional front view showing a vibration sieve according to the present invention, which shows another example of a vibration sieve having a balloon member. FIG. 5 is a pneumatic circuit diagram for operating the balloon member of the vibrating screen according to the present invention, and FIG. 6 is a time chart of air pressure control for operating the balloon member of the vibrating screen according to the present invention.

  First, the function of the vibrating sieve will be described. The vibrating sieve 1 shown in FIG. 1 is a powder having a particle diameter larger than a predetermined particle diameter by screening the powder charged into the container 2 from the inlet 23a with a sieve mesh 4 accommodated in the container 2. Is discharged from the discharge port 21c, and a powder having a particle size equal to or smaller than a predetermined particle size is discharged from the discharge port 22c.

  Next, the configuration of the vibrating sieve 1 will be described with reference to FIGS. The vibration sieve 1 includes a container 2 and vibration means 3 coupled to the container 2, and the container 2 is elastically supported on the lower base 8 via a spring 9. The container 2 is configured to be vibrated by transmitting the vibration of the vibration means 3.

  The vibration means 3 is configured by an upper weight 32 and a lower weight 33 being eccentrically coupled to an output shaft (not shown) of the motor 31. The eccentric upper weight 32 and lower weight 33 rotate around the output shaft, so that the vibration means 3 and the container 2 coupled to the vibration means 3 are vibrated. The vibration mode of the container 2 varies depending on the phase angle of the upper weight 32 and the lower weight 33, but the relative phase angle between the upper weight 32 and the lower weight 33 can be changed, and this phase angle is adjusted. By doing so, the vibration mode of the container 2 can be set. Since the movement and residence time of the powder on the sieve screen 4 differ depending on the vibration mode, the phase angle is properly used according to the properties of the powder.

  The container 2 includes an inner frame 21, a lower frame 22 and a lid 23. A cylindrical inner frame 21 is stacked on a cylindrical lower frame 22, and a lid 23 is further stacked thereon to form a substantially cylindrical container 2. The middle frame 21 and the lower frame 22, and the lid 23 and the middle frame 21 are coupled to each other by a band 24 wound from the outer periphery.

  A disc-shaped receiving tray 28 is supported substantially horizontally through the packing 25 at the joint between the middle frame 21 and the lower frame 22 inside the container 2, and a plurality of spherical shapes are placed on the receiving tray 28. A mesh hit 27 is placed freely moving. The sieve screen 4 is disposed above the receiving tray 28 so that a ring-shaped packing 26 is interposed between the receiving tray 28 and the sieve screen 4. The sieve screen 4 divides the space inside the container 2 into an upper space 2a and a lower space 2b.

  The powder in the upper space 2a is sieved by the vibrating sieve mesh 4, and the powder having a particle size smaller than the predetermined particle size passes through the sieve mesh 4 and moves to the lower space 2b, and exceeds the predetermined particle size. The powder remains in the upper space 2a without passing through the sieve screen 4. The size of the mesh of the sieve screen 4 is determined according to the particle size of the powder to be screened.

  The screen mesh 4 is disposed above and separated from the mesh hitting 27. However, when the container 2 vibrates, the mesh hitting 27 also vibrates up and down, and the mesh of the sieve mesh 4 is obtained by hitting the sieve mesh 4. It is configured to prevent clogging. Note that the tray 28 is configured to be porous, and the powder that has passed through the sieve mesh 4 also passes through the tray 28 and falls further downward.

  The middle frame 21 includes a cylindrical side wall 21a, and an opening 21b located above the sieve screen 4 is provided in the side wall 21a. The opening 21b communicates with the discharge port 21c through the tubular portion 21d protruding from the side wall 21a. A path connecting the opening 21b and the discharge port 21c constitutes a discharge path for discharging the powder in the upper space 2a to the outside. The lower edge of the opening 21 b is smoothly connected to the surface of the sieve screen 4, and the discharge path 5 is inclined downward from the inside of the container 2 to the outside. Therefore, the powder staying in the upper space 2a without passing through the sieve mesh 4 is swung by vibration from above the sieve mesh 4 if the discharge channel 5 is open, enters the discharge channel 5 through the opening 21b, and is discharged. It will be discharged | emitted from the exit 21c.

  The lower frame 22 includes a cylindrical side wall 22a, and a bottom plate 22e formed in a convex shape at the bottom. The side wall 22a is formed with an opening (not shown) that communicates with the discharge port 22c through the tubular portion 22d protruding from the side wall 22a, and the lower edge of the opening is smoothly connected to the surface of the bottom plate 22e. And the path | route which connects this opening and the discharge port 22c inclines below toward the outside from the inside of the container 2, and is provided. Therefore, the powder that passes through the sieve mesh 4 and enters the lower space 2b and falls on the bottom plate 22e is swung by vibration and discharged from the discharge port 22c through the opening provided in the side wall 22a.

  A bag-shaped balloon member 6 is disposed in the discharge path 5 connected from the upper space 2a. A pneumatic system (not shown) is connected to the balloon member 6 via a pipe 71, and the balloon member 6 can be expanded and contracted by air pressure. That is, when the balloon member 6 is pressurized, it expands on a substantially rectangular parallelepiped as shown in FIGS. 1 and 2, and the discharge path 5 is closed. When the balloon member 6 is depressurized, the discharge path 5 is opened. It is configured as follows.

  The relationship between the balloon member 6 and the discharge path 5 will be described in detail with reference to FIG. 3 is a cross-sectional view of the discharge path 5 indicated by AA in FIG. 1, wherein (a) is a cross-sectional view when the balloon member 6 is contracted, and (b) is a case where the balloon member 6 is expanded. FIG. A fixed plate 62 is attached to the outer surface of the upper portion of the balloon member 6, and the fixed plate 62 is fixed to the inner surface of the upper wall surface of the tubular portion 21d. The balloon member 6 is provided with a hole communicating with the pipe 71 at a position corresponding to the pipe 71, and pressurization / decompression by air pressure is performed through the hole. Further, a backing plate 63 provided with a hole corresponding to the pipe 71 is provided on the inner surface of the balloon member 6 so as to face the fixed plate 62, thereby ensuring airtightness of the pipe 71.

  When the balloon member 6 is pressurized, the balloon member 6 expands as shown in FIG. 3B, and the outer surface of the balloon member 6 comes into close contact with the inner surface of the wall surface of the tubular portion 21d, thereby closing the discharge path 5. Is done. Thus, when the discharge path 5 is obstruct | occluded, powder is not discharged | emitted from the upper side space 2a outside.

  When the balloon member 6 is depressurized, the balloon member 6 contracts as shown in FIG. At this time, since the balloon member 6 is coupled to the tubular portion 21d at the upper part, the discharge path 5 is gradually opened from the lower part when contracting. Further, since the upper part of the balloon member 6 is supported for a long time along the width direction of the discharge path 5 by attaching the fixing plate 62, even when contracted, the balloon member 6 does not hang down at the center, and is reliably discharged. The lower part of is opened. When the lower part of the discharge path 5 is opened, the powder is smoothly discharged from the upper space 2a to the outside without being inhibited by the balloon member 6.

  Note that a gap is formed between the wall surface of the tubular portion 21d and the balloon member 6 on both the left and right sides of the fixing plate 62 shown in FIG. 3, but in this embodiment, the filling member 64 is arranged to fill the gap. Yes. The filling member 64 can prevent a minute amount of powder from entering the gap.

  An elastic body is used for the balloon member 6, and synthetic rubber such as silicon or raw rubber is preferably used. Since the balloon member 6 is an elastic body, even if the container 2 vibrates repeatedly, the container 2 is not damaged, and the sealing performance is not impaired by wear. Even if the powder adheres to the balloon member 6, the performance of expansion / contraction is not hindered.

  The balloon member 6 shown in FIGS. 1 and 2 is formed so as to expand in a substantially rectangular parallelepiped shape. However, as shown in FIG. 4, one surface of the balloon member 6 follows the curved surface of the side wall 21a during expansion. It can also be formed into a shape. If comprised in this way, since there is no area | region covered with the balloon member 6 among the upper parts of the sieve mesh 4, all the powder thrown into the upper space 2a can be supplied on the sieve mesh 4, and can be screened by vibration. It becomes possible. This configuration can be achieved by attaching a cloth having poor stretchability to the surface of the balloon member 6 on which the shape is to be defined.

  Next, the pneumatic system 7 for controlling the expansion / contraction of the balloon member 6 will be described with reference to FIG. 5 which is a pneumatic circuit diagram. The pneumatic system 7 is largely divided into a system 7 b that pressurizes the balloon member 6 and a system 7 a that decompresses the balloon member 6.

  In the system 7b for pressurizing the balloon member 6, a compressor 78b for supplying compressed air, a hand valve 77b for manually adjusting air pressure, a regulator 76b for reducing air pressure, and an inflation valve 75 for controlling expansion of the balloon member are connected in series. Thus, the port of the inflation valve 75 is connected to the pipe 71 of the balloon member 6.

  The system 7a for depressurizing the balloon member 6 includes a compressor 78a for supplying compressed air, a hand valve 77a for manually adjusting air pressure, a regulator 76a for reducing air pressure, an ejector valve 73 for controlling generation of vacuum, and an ejector for generating vacuum. 72 is connected in series, and a silencer 79 is connected to the exhaust port of the ejector 72. A vacuum port of the ejector 72 is connected to a pipe 71 of the balloon member 6 via a relay valve 74.

  Next, the expansion / contraction control of the balloon member 6 will be described along with the passage of time based on FIG. 5 and FIG. 6 which is a time chart of air pressure control.

  In the state shown in FIG. 5, all the valves are in an off state, and in this state, the balloon member 6 is neither inflated nor deflated. When the relay valve 74 is first turned on at a certain time, the communication between the pipe 71 and the vacuum port of the ejector 72 is released. Next, the inflation valve 75 is turned on. Thereby, the compressed air communicates with the pipe 71. Then, the inside of the balloon member 6 is pressurized and the balloon member 6 expands. In addition, when the pressure of the balloon member 6 becomes excessive, the circuit is configured so that the inflation valve 75 is turned off for safety.

  Next, the balloon member 6 starts to contract. That is, first, the inflation valve 75 is turned off. Thereby, the communication between the compressed air and the pipe 71 is released. Then, the ejector valve 73 is turned on. Thereby, a vacuum is generated in the vacuum port of the ejector 72. Then, the relay valve 74 is turned off. Thereby, the piping 71 and the vacuum port of the ejector 72 communicate with each other. Then, the pressure inside the balloon member 6 is released and the balloon member 6 contracts.

  When the sequence control shown in the time chart of FIG. 6 is performed, the inflation / deflation of the balloon member 6 can be controlled. That is, the opening and closing of the discharge path 5 can be automatically controlled. In the time chart shown in FIG. 6, the discharge path 5 is closed for a predetermined time and is subjected to sequence control so as to open for a predetermined time. Here, the time during which the blockage of the discharge path 5 is maintained is set to a time necessary for all the powder having a particle size smaller than the predetermined particle size to pass through the sieve screen 4. Thereby, it is possible to prevent the powder having a particle size smaller than the predetermined particle size from being discharged from the discharge port 21c. In addition, the time for which the discharge path 5 is kept open is set to a time necessary for discharging all the powder having a particle size equal to or larger than the predetermined particle size remaining in the upper space 2a from the discharge port 21c.

  Although any fluid pressure such as hydraulic pressure can be used for the expansion / contraction of the balloon member 6, when air pressure is used as in this embodiment, the environment to which the powder is exposed can be kept clean. In addition, it is possible to avoid problems such as condensation on the balloon and accumulation of powder, which is preferable.

  Next, the procedure for sieving powder using the vibrating sieve 1 according to the present embodiment will be described. First, in a state where the balloon member 6 is inflated and the discharge path 5 communicating with the outside is closed, the powder to be screened is introduced into the container 2 from the inlet 23a. At this time, the charged powder is not discharged from the upper space 2a inside the container 2 to the outside.

  Next, the container 2 is vibrated by operating the vibration means 3. Thereby, the charged powder is sieved. At this time, the discharge path 5 is still closed, and during the sieving, the powder having a predetermined particle diameter or less, that is, the powder that should originally pass through the sieve screen 4 is discharged from the discharge port 21c. Without passing through the sieve screen 4, it moves to the lower space 2b and is discharged from the discharge port 22c. The container 2 may start vibrating after the powder is charged as described above, but before the powder is charged, the container 2 is started to vibrate, and the container 2 is vibrating while the container 2 is vibrating. It is also possible to input.

  After the sieving is completed, that is, after the powder that should originally pass through the sieve mesh 4 passes through the sieve mesh 4, the balloon member 6 is contracted to open the discharge passage 5. As a result, powder that does not pass through the sieve screen 4 and remains in the upper space 2a, that is, powder having a particle size equal to or larger than a predetermined particle size is discharged from the discharge port 21c.

  Then, the powder to be sieved again is put into the container 2 from the loading port 23a, and the above procedure is repeated, so that the sieving can be carried out continuously. During this time, it is not necessary to stop the vibration means 3. Also, by controlling the sequence of both the charging of the powder and the expansion / contraction of the balloon member 6, it is possible to perform automatic and continuous screening of the powder without requiring any user operation.

DESCRIPTION OF SYMBOLS 1 Vibrating sieve 2 Container 2a Upper space 2b Lower space 3 Vibrating means 4 Sieve net 5 Discharge path 6 Balloon member 7 Pneumatic system 71 Piping

Claims (3)

A container for containing powder;
Vibration means for vibrating the container;
A sieve screen arranged to divide the space in the container vertically, and for sieving the powder;
A discharge path for discharging the powder in the space above the sieve screen to the outside;
A bag-like balloon member that can be expanded and contracted by fluid pressure,
When the balloon member is inflated, the discharge path is closed,
When the balloon member contracts, the discharge path is opened ,
When the balloon member contracts , the vibrating sieve is released from the lower part in the cross section of the discharge path . The vibrating sieve according to claim 1, wherein the balloon member is expanded and contracted by air pressure. The vibration sieve according to claim 2 , wherein the air pressure acting on the balloon member is sequence-controlled.

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