JP5972140B2 - Vibrating sieve - Google Patents

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. Typical vibration sieve, during vibration, static electricity is generated by friction between the powder and between the powder and Furuimo, since the charged sieve screen, the powder adheres clogging in the sieve screen There was a problem that the sieving ability deteriorated. For this reason, there is known a vibrating sieve configured to eliminate clogging by arranging a spherical object called mesh hitting below the sieve mesh and repeatedly hitting the mesh hitting the mesh with vibration (patent) Reference 1, see FIG.

  In the conventional vibrating screen V shown in FIG. 7, the metal screen 10 is made of resin in order to seal the gap in the container 40 and prevent the friction between metals and the generation of wear powder. Are supported via packings 22 and 32 of elastic bodies. Therefore, the sieve screen 10 is electrically insulated so that charged static electricity does not escape. For this reason, there is a possibility that a spark may occur in the container 40, which raises a concern about safety.

Therefore, in order to prevent the screen 10 from being charged, one end of the conductive strip-shaped wire mesh is adhered to the screen 10 by providing an exposed portion so as not to be completely insulated with an adhesive, and the other end is connected to the container 40. A vibrating sieve has been proposed in which the sieve screen 10 is electrically connected to the container 40 by being in close contact with the container (see Patent Document 2). In this vibrating sieve, the sieve mesh 10 is electrically connected to the container 40, so that the electrification of the sieve mesh 10 is suppressed, and clogging and adhesion of powder can be suppressed to some extent.

On the other hand, the mesh hitting 33 is placed on a metal receiving tray 31 disposed below the sieve mesh 10. The tray 31 is provided with a large number of holes 31a through which powder passes. The tray 31 is charged by the static electricity generated by the repeated hitting of the mesh hits 33. Since the receiving tray 31 is also supported by the container 40 through a packing 44 made of an elastic material made of resin, like the sieve mesh 10, it is electrically insulated and has a structure in which charged static electricity does not escape. There is still a possibility of sparks.

Japanese Utility Model Publication No. 64-32774 JP 2002-346479 A

  Therefore, the problem to be solved by the present invention is to provide a vibrating screen that suppresses electrification of the sieve screen and the tray and is safe and has a high screening ability.

  The present invention has been made in order to solve the above problems, and the invention according to claim 1 is a vibrating sieve that sifts powder by vibrating, and a container that contains the powder inside, A sieve mesh that divides the space in the container vertically, a spherical mesh hitting the sieve mesh that is disposed below the sieve mesh, and a tray that supports the mesh hitting, the sieve mesh, A vibrating sieve comprising a short-circuit member for electrically short-circuiting the tray and the container.

  According to the first aspect of the present invention, it is possible to provide a vibrating screen having a safe and high screening ability, in which electrification of the sieve screen and the tray is suppressed during operation.

  The invention according to claim 2 is characterized in that the short-circuit member is elastically pressed and brought into contact with at least one of the sieve mesh, the tray and the container. It is a vibrating sieve.

  According to the second aspect of the present invention, it is possible to provide a vibrating sieve that can be reliably short-circuited even during vibration to suppress charging.

  The invention according to claim 3 further includes a packing sandwiched between the sieve mesh and the tray, and the short-circuit member is wound from the metal thin piece that is wound around the outer periphery of the packing and contacts the container. The vibration sieve according to claim 2, wherein

  According to the third aspect of the present invention, it is easy to attach a short-circuit member for suppressing electrification of the sieve screen and the saucer, and it is possible to provide a vibration sieve that reliably short-circuits during vibration.

  According to a fourth aspect of the present invention, the short-circuit member is composed of a stretchable spring that protrudes up and down from the sieve mesh, and an upper end of the spring abuts on a support member extending from the container, The vibrating screen according to claim 2, wherein a lower end of the spring is in contact with the tray.

  According to the invention described in claim 4, it is possible to electrically short-circuit the sieve screen, the saucer, and the container without requiring high-precision positioning, and the vibration sieve that reliably short-circuits during vibration. Can be provided.

  The invention according to claim 5 is the vibration sieve according to claim 4, further comprising a guide member that defines an expansion / contraction direction of the spring.

  According to the fifth aspect of the present invention, it is possible to provide a vibrating sieve capable of repeatedly and reliably performing a short circuit between the sieve screen, the tray and the container even when disassembling and reassembling.

The invention according to claim 6 is characterized in that the sieve mesh has a wire mesh for sieving powder and a ring member fixed to a peripheral portion of one surface of the wire mesh, and the guide member is the ring member. The vibrating sieve according to claim 5, wherein the vibrating sieve is fixed to the vibrating screen.

  According to the sixth aspect of the present invention, it is possible to provide a vibration sieve that is easy to manufacture and has high strength of the guide member and high reliability.

  According to a seventh aspect of the present invention, the guide member is embedded in the ring member, and the guide member protrudes from a surface opposite to a surface of the ring member to which the wire mesh is fixed. The vibration sieve according to claim 6.

  According to the seventh aspect of the present invention, it is possible to provide a vibrating sieve that facilitates positioning of the sieve mesh on the tray.

  According to the present invention, it is possible to provide a vibration sieve that is safe and has a high sieving ability because charging of the sieve screen and the tray is suppressed during operation.

It is a fragmentary sectional side view which shows the vibration sieve which concerns on this invention. It is an expanded sectional side view which expands and shows the area | region A of FIG. 1 in the vibration sieve which concerns on 1st embodiment of this invention. It is the arrow line view which looks at arrow line BB in FIG. 2, and is the figure which looked at except the upper frame, the upper support member, packing, and the sieve net. It is an expanded sectional side view which expands and shows the area | region A of FIG. 1 in the vibration sieve which concerns on 2nd embodiment of this invention. It is a disassembled perspective view of the sieve screen in the vibration sieve which concerns on 2nd embodiment of this invention. It is a perspective view of the other example of the sieve screen in the vibration sieve which concerns on 2nd embodiment of this invention. It is an expanded sectional side view which shows the support part vicinity of the sieve screen of the conventional vibration sieve.

  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.

(First embodiment)
1st Embodiment of the vibration sieve which concerns on this invention is described based on FIGS. FIG. 1 is a partial sectional side view showing a vibrating sieve according to the present invention, and FIG. 2 is an enlarged sectional side view showing a region A of FIG. 1 in the vibrating sieve according to the first embodiment of the present invention. FIG. 3 is an arrow view seen from the arrow BB in FIG. 2 and is a view seen without the upper frame, the upper support member, the packing, and the sieve mesh.

  First, the function of the vibrating sieve will be described. The vibrating sieve 100 shown in FIG. 1 is a powder having a particle size larger than a predetermined particle size by screening the powder charged into the container 40 from the charging port 46 with the sieve mesh 10 accommodated in the container 40. Is discharged from the discharge port 47, and a powder having a particle size equal to or smaller than a predetermined particle size is discharged from the discharge port 48.

  Next, the configuration of the vibrating sieve 100 will be described with reference to FIGS. The vibration sieve 100 includes a container 40 and vibration means 50 coupled to the container 40, and the container 40 is elastically supported by the lower base 60 via a spring 70. The container 40 is configured to be vibrated when the vibration of the vibration means 50 is transmitted. The vibration means 50 generates vibration by rotating an eccentric weight. The container 40 is grounded by a grounding means (not shown).

  The container 40 includes an inner frame 41, a lower frame 42, and a lid 45. A cylindrical inner frame 41 is stacked on a cylindrical lower frame 42, and a lid 45 is further stacked thereon to form a substantially cylindrical container 40. The middle frame 41 and the lower frame 42, and the lid 45 and the middle frame 41 are coupled by a band 43 wound from the outer periphery. The middle frame 41, the lower frame 42, the lid 45, and the band 43 are all made of metal. The band 43 is divided in the circumferential direction and is fastened with a snap lock (not shown).

  A disc-shaped receiving tray 31 is supported substantially horizontally via a packing 44 at the joint between the middle frame 41 and the lower frame 42 inside the container 40, and a plurality of spherical shapes are provided on the receiving tray 31. A mesh hit 33 is placed freely moving. The sieve screen 10 is spaced above the tray 31 and a ring-shaped packing 32 is interposed between the tray 31 and the sieve mesh 10. The sieve mesh 10 divides the space inside the container 40 into an upper space 40a and a lower space 40b. In addition, although the strip-shaped metal thin piece 34 is wound around the outer periphery of the packing 32, the detail is mentioned later.

  The powder in the upper space 40a is sieved by the vibrating sieve mesh 10, and the powder having a particle size smaller than the predetermined particle size passes through the sieve mesh 10 and moves to the lower space 40b, and exceeds the predetermined particle size. The powder remains in the upper space 40a without passing through the sieve screen 10. The size of the mesh of the sieve mesh 10 is determined according to the particle size of the powder to be screened.

  The sieve screen 10 is disposed above and separated from the mesh mesh 33, but when the container 40 vibrates, the mesh mesh 33 also vibrates up and down and collides with the mesh mesh 10 to collide with the mesh mesh 10. It is configured to prevent clogging. The tray 31 is provided with a large number of holes 31a, and the powder that has passed through the sieve screen 10 also passes through the tray 31 and falls into the lower space 40b.

  A discharge port 47 that communicates with the upper space 40 a extends from the middle frame 41, and a discharge port 48 that communicates with the lower space 40 b extends from the lower frame 42. That is, powder having a particle size smaller than the predetermined particle size is discharged from the discharge port 48, and powder having a particle size larger than the predetermined particle size is discharged from the discharge port 47.

  Next, the detail of the structure which supports the sieve net | network 10 and the saucer 31 is demonstrated based on FIG.

  The sieve mesh 10 is composed of a circular wire mesh 11 and a ring member 15 fixed to the peripheral edge of the wire mesh 11. The mesh size is selected according to the particle size of the wire mesh 11 to be screened. The ring member 15 has a square pipe cross section, and is fixed to the lower surface of the metal mesh 11 by any method such as adhesion, welding, or brazing, but is fixed to be conductive to the metal mesh 11.

  The sieve screen 10 is supported by the container 40 by being sandwiched up and down at the peripheral edge to which the ring member 15 is fixed. That is, the upper side of the sieve mesh 10, that is, the upper surface of the wire mesh 11 is pressed downward by the upper support member 21 via the packing 22, and the lower side of the sieve mesh 10, that is, the lower surface of the ring member 15 is ring-shaped packing. It is pressed upward by the tray 31 through 32. The upper support member 21 is a metal member that extends from the middle frame 41 of the container 40 toward the inside of the container 40, and is electrically connected to the middle frame 41.

  Here, the short-circuit member 80 which electrically short-circuits the sieve screen 10, the tray 31, and the container 40 will be described. In this embodiment, as the short-circuit member 80, a strip-shaped metal thin piece 34 is wound around the outer periphery of the packing 32 in a cross section perpendicular to the longitudinal direction.

  The length of the thin piece 34 is set to be longer than the outer peripheral length of the packing 32, and a surplus portion wound around the outer periphery of the packing 32 becomes a tongue-like portion 34 a extending from the packing 32. The tongue portion 34 a is sandwiched between the flange portion 41 a of the middle frame 41 and the packing 44. And since the flange part 41a is pressed toward the packing 44 by the band 43 wound from the outer periphery, the tongue-like part 34a is in close contact with the flange part 41a. That is, the sieve screen 10 is a short-circuit portion S1, the tray 31 is a short-circuit portion S2, and the inner frame 41 is a short-circuit portion S3, which are in close contact with the thin piece 34 wound around the packing 32 and are electrically connected. Yes. Since the container 40 is grounded, the static electricity of the sieve screen 10 and the tray 31 falls to the ground. In addition, since the short circuit part S1 and the short circuit part S2 are elastically pressed by the packing 32, contact is maintained even if it vibrates, and it becomes possible to maintain a short circuit.

  2 and 3, the tongue 34 a of the thin piece 34 is in close contact with the flange 41 a of the middle frame 41, passes through the gap of the band 43 divided in the circumferential direction, and has an end on the outside of the container 40. It is comprised so that it may protrude (refer FIG. 3, a dashed-two dotted line). However, the tongue-like portion 34 a of the thin piece 34 can be configured to be in close contact with the flange portion 41 a of the middle frame 41, further folded along the outer surface of the packing 44, and in close contact with the flange portion 42 a of the lower frame 42. is there.

  The material of the thin piece 34 can be arbitrarily selected from those having conductivity, but a stainless steel plate having a thickness of about 0.1 mm or a stainless steel tape having a thickness of about 0.12 mm is preferable because it has excellent corrosion resistance. Used for. Of course, a thin plate of iron or aluminum, an aluminum tape, or the like can also be used.

  The vibrating screen 100 according to the present embodiment is obtained by simply wrapping the thin piece 34 as the short-circuit member 80 around the packing 32 without providing an exposed portion so as not to insulate the short-circuit member from the member such as the wire mesh 11. Thus, the sieve screen 10 and the tray 31 are electrically connected to the container 40 only by assembling as usual. The conduction is not released even during vibration by the pressing by the packing 32 which is an elastic body. That is, charging of the sieve screen 10 and the tray 31 is suppressed during operation, and it is possible to easily configure the vibrating sieve 100 with high safety and sieving ability.

(Second embodiment)
Next, 2nd embodiment of the vibration sieve which concerns on this invention is described based on FIGS. FIG. 4 is an enlarged cross-sectional side view showing a region A of FIG. 1 in the vibration sieve according to the second embodiment of the present invention, and FIG. 5 is a diagram of the vibration sieve according to the second embodiment of the present invention. It is a disassembled perspective view of a sieve net. FIG. 6 is a perspective view of another example of a sieve screen in the vibrating screen according to the second embodiment of the present invention. The overall configuration of the vibrating screen 200 according to the second embodiment is the same as that of the vibrating screen 100 according to the first embodiment, and the difference is the specific configuration of the screen 10 and the configuration of the short-circuit member 80. It is. Therefore, the following description will focus on the configuration of the sieve screen 10 as a difference, and corresponding portions will be described with the same reference numerals.

  Similar to the first embodiment, the sieve mesh 10 according to the second embodiment includes the wire mesh 11 and the ring member 15 as main components. And in order to support the spring 12 as the short circuit member 80, the guide member 13 which guides the expansion-contraction of the spring 12, and the spring support pin 14 which supports the spring 12 are provided.

  The structure of the spring 12, the guide member 13, and the spring support pin 14 is demonstrated based on FIG. The ring member 15 having a square pipe cross section is provided with a through hole 15a penetrating vertically, and a guide member 13 made of a metal cylinder is fitted into the through hole 15a and fixed. Further, the wire mesh 11 whose peripheral part is fixed to the ring member 15 is also provided with a hole 11a at a position continuous with the through hole 15a (see FIG. 5). The guide member 13 is fixed to the ring member 15 by welding or the like and is electrically connected. The upper end of the guide member 13 is located substantially flush with the upper surface of the ring member 15, and the lower end protrudes from the lower surface of the ring member 15 (see FIG. 5).

  A spring 12 as a short-circuit member 80 is disposed inside the guide member 13. The spring 12 is a metal coil spring. Here, the guide member 13 is provided with a metal spring support pin 14 penetrating in the radial direction. Inside the guide member 13, the spring support pin 14 extending in the radial direction is sandwiched between the coil wires of the spring 12, whereby the spring 12 is supported by the guide member 13 (see FIGS. 4 and 5). The extension / contraction direction of the spring 12 is defined by the guide member 13. In the example shown in FIGS. 4 and 5, three sets of guide members 13 and spring support pins 14 are provided on the sieve mesh 10, and a spring 12 is coupled to each.

  The spring 12 is electrically connected to the sieve mesh 10 via a metal spring support pin 14 and a metal guide member 13. Further, the spring 12 is set to protrude from the upper and lower ends of the guide member 13 in a natural length. Therefore, by placing the sieve screen 10 on the tray 31, the spring 12 is contracted and the lower end thereof contacts the tray 31. Further, since the sieve screen 10 is pressed against the upper support member 21 with the packing 22 interposed therebetween, the spring 12 protruding upward contracts and the upper end thereof contacts the upper support member 21. The upper support member 21 is a metal member that extends from the middle frame 41 of the container 40 toward the inside of the container 40, and is electrically connected to the middle frame 41. That is, the sieve screen 10 is a short-circuit portion S1, the tray 31 is a short-circuit portion S2, and the inner frame 41 is a short-circuit portion S3. Since both ends of the spring 12 are elastically pressed by the tray 31 and the upper support member 21, contact is maintained even when vibrating, and conduction can be maintained. The packing 22 is formed so as to avoid a portion where the through hole 15 a and the hole 11 a are continuous, and does not interfere with the conduction between the spring 12 and the upper support member 21.

As described above, the spring 12 as the short-circuit member 80 is integrated with the sieve mesh 10. Since the spring 12 has its extending and contracting direction defined by the guide member 13, both ends of the spring 12 abut against the tray 31 and the upper support member 21 without being bent halfway. By constructing in this way, for example, when reassembling after disassembling the vibrating sieve 200 for cleaning, the sieve mesh 10 is placed on the receiving tray 31 and the middle frame 41 is only set thereon. Thus, since the screen 10, the tray 31 and the inner frame 41 are conducted, the short circuit of the screen 10, the tray 31 and the container 40 can be repeatedly and reliably reproduced. Moreover, since the guide member 13 protrudes from the lower surface of the ring member 15 at three positions with equal intervals , the sieve screen 10 can be placed on the tray 31 in a stable posture. Further, as shown in FIG. 4, the guide member 13 is configured to circumscribe the ring-shaped packing 32 with an external contact C. Therefore, the sieve screen 10 can be easily positioned with respect to the packing 32.

  In the example shown in FIGS. 4 and 5, the ring member 15 is provided with a through hole 15a penetrating vertically, and the guide member 13 is fitted and fixed to the through hole 15a. The position is not limited to this, and for example, as shown in FIG. 6, the ring member 15 may be coupled to the outer periphery by welding. The configuration shown in FIG. 6 differs from the configuration shown in FIGS. 4 and 5 only in the position of the guide member 13, and the positional relationship between the guide member 13, the spring 12, and the spring support pin 14 is as shown in FIGS. 4 and 5 is the same as that shown in FIGS.

  In the vibrating sieve 200 according to the present embodiment, the spring 12 as the short-circuit member 80 is integrated with the sieve mesh 10, and the short-circuiting of the sieve mesh 10, the tray 31 and the container 40 can be repeatedly and reliably reproduced. Moreover, the positioning of the sieve screen 10 is easy. The conduction by the spring 12 as an elastic body is not released even during vibration. That is, charging of the sieve screen 10 and the receiving tray 31 is suppressed during operation, and it is possible to easily configure the vibrating sieve 200 with high safety and sieving ability.

100, 200 Vibrating sieve 10 Sieve net 11 Wire net 12 Spring 13 Guide member 15 Ring member 21 Upper support member (support member)
31 Receptacle 32 Packing 33 Netting 34 Thin piece 40 Container 80 Short-circuit member

Claims (7)

A vibrating sieve that sifts out powder by vibrating,
A container for containing powder inside;
A sieve screen that divides the space in the container vertically;
A spherical mesh that is disposed below the sieve mesh and collides with the sieve mesh by vibration;
A saucer for supporting the net hitting;
A vibration sieve comprising: a sieve member that electrically short-circuits the sieve mesh, the tray, and the container. The vibrating sieve according to claim 1, wherein the short-circuit member is elastically pressed and brought into contact with at least one of the sieve mesh, the tray, and the container. Further comprising a packing sandwiched between the sieve mesh and the saucer,
The vibrating screen according to claim 2, wherein the short-circuit member is made of a metal thin piece that is wound around an outer periphery of the packing and abuts against the container. The short-circuit member is composed of a stretchable spring projecting up and down from the sieve mesh,
The vibration sieve according to claim 2, wherein an upper end of the spring is in contact with a support member extending from the container, and a lower end of the spring is in contact with the tray. The vibration sieve according to claim 4, further comprising a guide member that defines an extension / contraction direction of the spring. The sieve mesh has a wire mesh for sieving powder , and a ring member fixed to a peripheral portion of one surface of the wire mesh;
The vibrating screen according to claim 5, wherein the guide member is fixed to the ring member.
The guide member is embedded in the ring member,
The vibrating sieve according to claim 6, wherein the guide member protrudes from a surface opposite to a surface of the ring member on which the wire mesh is fixed.

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