Net fixture

Abstract

To enable easy replacement of a sieve net in a vibration sieve apparatus and reduce an environmental load caused by replacement of the sieve net.SOLUTION: A net fixture 3 is detachably attached to a vibration sieve apparatus 1 and fixes a sieve net 21. The net fixture 3 includes: a receiving frame 31; a pressing frame 32 which is disposed on the receiving frame 31 and sandwiches the sieve net 21 with the receiving frame 31; and a fastening member 33 which pushes the receiving frame 31 and the pressing frame 32 against each other so that the sieve net 21 is fixed by the receiving frame 31 and the pressing frame 32.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a screen fixing device for fixing a screen to be attached to a vibrating screen device for classifying, separating, filtering, etc., powder material. [Background technology]

[0002] A vibrating sieve device is known as a device for classifying, selecting, filtering, etc., powder materials. A vibrating sieve device uses a motor to vibrate a sieve mesh installed inside the device to classify the powder materials fed into it. There are various methods for attaching a sieve mesh to a vibrating sieve device, and the methods are disclosed in Patent Documents 1 and 2, for example.

[0003] Patent Document 1 discloses a vibrating screen device to which a sieve screen is directly attached. In this vibrating screen device, a cylindrical sieve frame is divided into upper and lower halves, and the sieve screen is sandwiched between the upper and lower divided sieve frames. The ends of the sieve screen protrude radially outward from the outer circumferential surfaces of the upper and lower divided sieve frames. The sieve screen is fixed by fastening this protruding portion to the lower divided sieve frame with a fastening band.

[0004] Patent Document 2 discloses a mesh member in which a sieve screen is indirectly attached to a vibrating screening device. The mesh member is composed of a circular sieve frame and a sieve screen attached to the upper surface of the sieve frame by bonding, welding, or the like. The mesh member is configured so that it can be handled as a separate entity from the vibrating screening device. The mesh member is attached to the vibrating screening device, whereby the sieve screen is attached to the vibrating screening device. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-76901 A [Patent Document 2] JP 2013-6139 A Summary of the Invention [Problem to be solved by the invention]

[0006] A sieve mesh with a mesh size according to the purpose is attached to the vibrating sieve device. Therefore, if the powder material to be sieved changes, the sieve mesh needs to be replaced. Also, if the sieve mesh is damaged or deteriorated, it needs to be replaced. In the vibrating sieve device of Patent Document 1, when replacing the sieve mesh, the upper split sieve frame is separated from the lower split sieve frame, and the sieve mesh fixed to the lower split sieve frame with a tightening band is removed. After that, a new sieve mesh is placed on the lower sieve frame, and the sieve mesh is replaced by fixing it with a tightening band while applying tension to the sieve mesh. However, a high level of skill is required to fix the sieve mesh to the cylindrical lower split sieve frame having a certain size with a tightening band while applying tension to the sieve mesh. Therefore, in the vibrating sieve device in which the sieve mesh is directly attached as in Patent Document 1, it is not easy to replace the sieve mesh.

[0007] In contrast, the mesh member of Patent Document 2 can be handled separately from the vibrating screen device, so it is only necessary to attach the sieve to the annular screen frame, and there is no need for the extensive work of directly attaching the sieve to the vibrating screen device. The sieve can be replaced simply by preparing a new mesh member with a new sieve attached and replacing the old mesh member attached to the vibrating screen device. In this way, the detachable mesh member of Patent Document 2 makes it easy to stretch the sieve by applying a predetermined tension, and also makes it easy to replace the sieve provided in the vibrating screen device.

[0008] However, in the mesh member of Patent Document 2, the sieve screen is attached to the sieve frame with adhesive, and it is difficult to remove only the sieve screen from the sieve frame. Therefore, when the mesh member is replaced, not only the sieve screen but also the sieve frame is discarded. In short, in the vibrating sieve device to which the sieve screen is directly attached as exemplified in Patent Document 1, only the sieve screen can be replaced, but it is not easy to replace the sieve screen. On the other hand, in the mesh member indirectly attached to the vibrating sieve device as exemplified in Patent Document 2, it is easy to replace the mesh member, but it is not easy to replace only the sieve screen.

[0009] An object of the present invention is to facilitate replacement of a sieve screen in a vibrating screen device and to reduce the environmental load caused by replacement of the sieve screen. [Means for solving the problem]

[0010] (1) The screen fixing device of the present invention is a screen fixing device that is detachable from a vibrating screen device and fixes a screen. The screen fixing device includes a receiving frame, a pressing frame that is disposed on the receiving frame and that sandwiches the screen together with the receiving frame, and a tightening member that presses the receiving frame and the pressing frame against each other so as to fix the screen by the receiving frame and the pressing frame.

[0011] The above-mentioned mesh fixing device can be attached and detached to the vibrating sieve device, and can be handled separately from the vibrating sieve device. Therefore, there is no need to attach the sieve screen directly to the vibrating sieve device, and the sieve screen can be replaced by replacing the old mesh fixing device with a new mesh fixing device on which the sieve screen has already been stretched. In addition, the sieve screen can be fixed or removed by moving the receiving frame and the pressing frame closer to or farther apart using the tightening member. Therefore, when replacing the sieve screen, only the sieve screen can be replaced, and the receiving frame and the pressing frame can be reused. Therefore, according to the above-mentioned mesh fixing device, the sieve screen can be easily replaced, and the environmental load caused by replacing the sieve screen can be reduced.

[0012] (2) In the screen fixing device of (1) above, the receiving frame may include a receiving side clamping surface that is a surface that comes into contact with the sieve screen when the sieve screen is fixed and that constitutes at least a part of the upper surface of the receiving frame, and the pressing frame may include a pressing side clamping surface that clamps the sieve screen together with the receiving side clamping surface. The receiving side clamping surface may include a receiving side convex portion or a receiving side concave portion, and the pressing side clamping surface may include a pressing side convex portion that corresponds to the receiving side convex portion and corresponds to a pressing side concave portion or a receiving side concave portion that clamps the sieve screen together with the receiving side convex portion and clamps the sieve screen together with the receiving side concave portion.

[0013] In a vibrating sieve device, vibrations are applied to the sieve screen to sift the powder material. This vibration can loosen the tension of the sieve screen. In the screen fixing device of (2) above, the concave and convex parts fit together, sandwiching the sieve screen. In other words, the convex parts are driven into the sieve screen like wedges. Therefore, with this screen fixing device, the receiving frame and the pressing frame can firmly fix the sieve screen, and the tension of the sieve screen is likely to be maintained even when vibrations are applied.

[0014] (3) In the mesh fixing device of (1) above, the receiving frame may have a circular ring shape and further include a receiving side clamping surface that is a surface that comes into contact with the sieve mesh when the sieve mesh is fixed and that constitutes part of the upper surface of the receiving frame, and a protrusion that is provided on the receiving frame more inward than the receiving side clamping surface and protrudes above the receiving side clamping surface.

[0015] In the above-mentioned (3) net fixing device, when the sieve net is sandwiched between the receiving frame and the pressing frame, the protruding portion is pushed into the sieve net from below. Therefore, the area of ​​the sieve net inside the receiving frame is pulled to the outside of the receiving frame. Therefore, this net fixing device makes it easy to apply the desired tension to the sieve net.

[0016] (4) In the net fastener of (1) above, the receiving frame may include a receiving-side through-hole that passes through the receiving frame in the vertical direction and into which a bolt can be inserted.

[0017] Generally, in a mesh fixing device detachable from a vibrating screen device, to attach a mesh to a mesh frame, first, adhesive is applied to the upper surface of the mesh frame and the mesh frame is placed on a lifting platform. Since the lifting platform is a piece of equipment with a certain height, a jig that is taller than the lifting platform is prepared. Next, the mesh held by the jig is placed above the mesh frame. Then, the lifting platform is raised, and the mesh frame is pressed against the mesh from below, applying a desired tension to the mesh. This state is maintained until the adhesive dries, and the mesh is attached to the mesh frame. However, in this attachment method, special equipment such as a lifting platform and a jig that holds the mesh above the mesh frame is required when attaching the mesh to the mesh frame. In contrast, in the mesh fixing device of (4) above, the receiving frame is placed on a stand, a bolt is inserted into the receiving side through hole provided in the receiving frame, and the receiving frame is raised and lowered by the axial force of the bolt by turning the bolt. For example, a sieve mesh can be placed on the receiving frame, the sieve mesh is fixed to the stand on which the receiving frame is placed, and the receiving frame is raised, thereby applying a desired tension to the sieve mesh. Therefore, with this mesh fixing device, the sieve mesh can be attached to the sieve frame with a predetermined tension without using special equipment such as a lifting stand and a jig, making it even easier to replace the sieve mesh.

[0018] (5) In the mesh fixing device of (4) above, the receiving frame may include a receiving side clamping surface that is a surface that contacts the sieve mesh when the sieve mesh is fixed and that constitutes at least a part of the upper surface of the receiving frame, and the pressing frame may include a pressing side through hole that penetrates the pressing frame in the vertical direction and is provided at a position corresponding to the receiving side through hole, and a pressing side clamping surface that clamps the sieve mesh together with the receiving side clamping surface. The receiving side through hole may open into the receiving side clamping surface, and the pressing side through hole may open into the pressing side clamping surface. The tightening member may include a fastening bolt and be inserted into the receiving side through hole and the pressing side through hole.

[0019] In the net fixing device of (5) above, a fastening bolt is used as a fastening member for pressing the receiving frame and the pressing frame together. The hole for inserting the fastening bolt is also used as a through hole for raising and lowering the receiving frame when attaching the above-mentioned sieve net. Therefore, with this net fixing device, there is no need to provide a separate through hole for raising and lowering the receiving frame when attaching the sieve net, and the net fixing device can be made compact. Effect of the Invention

[0020] According to the screen fixing device of the present invention, the screen in the vibrating screen device can be easily replaced, and the environmental load caused by replacing the screen can be reduced. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a cross-sectional view that shows a schematic diagram of a vibrating screen device to which a net fixing device of this embodiment is attached. [Diagram 2] FIG. 2 is a top view of the net fastener of this embodiment. [Diagram 3] FIG. 3 is an exploded cross-sectional view taken along line III-III in FIG. 2, with each member separated. [Figure 4] FIG. 4 is a cross-sectional view showing a state in which the net fixing device of this embodiment is attached to a vibrating screen device. [Diagram 5] FIG. 5 is a diagram showing a process of attaching a sieve net to the net fixing device of this embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, a vibrating screen device to which a net fixing device of the present embodiment is attached will be generally described.

[0023] 1 is a cross-sectional view showing a schematic diagram of a vibrating sieve device to which the mesh fixing device of the present embodiment is attached. The vibrating sieve device 1 includes an upper sieve chamber 11, a middle sieve chamber 12, a lower sieve chamber 13, and a lid 14. The lower sieve chamber 13, the middle sieve chamber 12, and the upper sieve chamber 11 are stacked vertically in this order.

[0024] The upper sieving chamber 11 has a cylindrical shape. The upper sieving chamber 11 has openings on the top and bottom surfaces. The upper sieving chamber 11 forms a chamber for sieving powdered material. The upper sieving chamber 11 has a discharge pipe 111 for discharging powdered material of a predetermined size or larger outside the device. The discharge pipe 111 is connected to the outer peripheral surface of the upper sieving chamber. A middle sieving chamber 12 is provided below the upper sieving chamber 11. The upper sieving chamber 11 and the middle sieving chamber 12 are fastened and connected by a fastening member. The fastening member is, for example, a fastening band. The middle sieving chamber 12 and the lower sieving chamber 13 are similarly connected. Note that the middle sieving chamber 12 and the lower sieving chamber 13 have the same configuration as the upper sieving chamber 11, so a description thereof will be omitted.

[0025] A lid 14 is disposed on the upper sieving chamber 11. The lid 14 is attached to the upper sieving chamber 11 so as to cover an opening provided on the upper surface of the upper sieving chamber 11. The lid 14 has an inlet 141 for introducing powder material.

[0026] The vibrating sieve device 1 further includes a support plate 15, a base 16, and a vibration mechanism 17. The support plate 15 is provided at the lower end of the lower sieve chamber 13. The support plate 15 is connected to the lower sieve chamber by a fastening member. The base 16 supports the support plate 15 via a plurality of buffer members 18. The buffer members 18 are, for example, coil springs. The vibration mechanism 17 is connected to the support plate 15 and applies vibration to the support plate 15. The vibration of the support plate 15 causes each sieve chamber to vibrate. The vibration mechanism 17 includes, for example, an electric motor.

[0027] The vibrating sieve device 1 further includes sieve screens 21, 22 and screen fixing devices 3, 4. The sieve screen 21 is provided at the lower end of the upper sieve chamber 11. The sieve screen 21 allows powder material smaller than the mesh of the powder material fed into the upper sieve chamber 11 to pass through and enter the middle sieve chamber 12. The sieve screen 21 allows powder material larger than the mesh to remain in the upper sieve chamber 11. The powder material remaining in the upper sieve chamber 11 moves toward the discharge pipe 111 due to vibration and is discharged from the discharge pipe 111. The sieve screen 22 is provided at the lower end of the middle sieve chamber 12. The sieve screen 22 has a finer mesh than the sieve screen 21.

[0028] The mesh fixing devices 3 and 4 respectively fix the sieve meshes 21 and 22. The mesh fixing devices 3 and 4 are configured to be detachable from the vibrating sieve device 1. Since the two mesh fixing devices 3 and 4 have the same structure, the following will describe the mesh fixing device 3 provided in the upper sieving chamber 11, and a description of the mesh fixing device 4 provided in the middle sieving chamber 12 will be omitted.

[0029] 2 is a top view of the net fixture of this embodiment. The net fixture 3 has a circular ring shape corresponding to the inner peripheral surface of the upper sieve chamber 11. The sieve net 21 is stretched on the inside of the net fixture 3 with a predetermined tension applied.

[0030] Fig. 3 is an exploded cross-sectional view taken along line III-III in Fig. 2 with each component separated. The net fixing device 3 includes a receiving frame 31, a pressing frame 32, and a fastening member 33. The receiving frame 31 has an annular shape corresponding to the inner peripheral surface of the upper sieve chamber 11. The receiving frame 31 includes a receiving side clamping surface 311, a receiving side recess 312, a receiving side through hole 313, and a protrusion 314.

[0031] The receiving side clamping surface 311 is a surface that comes into contact with the sieve screen 21 when the sieve screen 21 is fixed. The receiving side clamping surface 311 constitutes a part of the upper surface of the receiving frame 31. The receiving side clamping surface 311 is flat. However, the receiving side clamping surface 311 is provided with openings of the receiving side recess 312 and the receiving side through hole 313.

[0032] The receiving side recess 312 has a truncated cone shape with a diameter decreasing downward from the receiving side clamping surface 311. The receiving side recess 312 is provided on the opening edge of the receiving side through hole 313. The receiving side recess 312 is provided so as to be coaxial with the receiving side through hole 313. The receiving side recess 312 is provided to a predetermined depth from the receiving side clamping surface 311. The depth (vertical length) of the receiving side recess 312 is smaller than the vertical length of the receiving frame 31.

[0033] The receiving side through hole 313 penetrates the receiving frame 31 in the up-down direction. The receiving side through hole 313 opens to the upper surface and the lower surface of the receiving frame 31. More specifically, the receiving side through hole 313 opens to the lower end surface of the receiving side recess 312. A plurality of receiving side through holes 313 are provided along the circumferential direction of the receiving frame 31 (see FIG. 2). The receiving side through hole 313 is provided between the outer edge and the inner edge of the receiving frame 31 in the radial direction of the receiving frame 31. The receiving side through hole 313 is provided near the center of the receiving side clamping surface 311 in the radial direction of the receiving frame 31. The receiving side through hole 313 may or may not have a thread. That is, the receiving side through hole 313 may be a screw hole with a thread cut, or may be a hole for a tapping screw.

[0034] The protruding portion 314 is provided on the inside of the receiving frame 31 relative to the receiving clamping surface 311. The protruding portion 314 protrudes above the receiving clamping surface 311. The protruding portion 314 is provided over the entire circumferential area of ​​the receiving frame 31. The protruding portion 314 forms the inner circumferential surface of the receiving frame 31.

[0035] The pressing frame 32 is disposed on the receiving frame 31. The pressing frame 32 has a circular ring shape corresponding to the receiving frame 31. The pressing frame 32 is configured so as to be able to be placed on the receiving frame 31. The pressing frame 32, together with the receiving frame 31, sandwiches the sieve screen 21. When the pressing frame 32 is attached to the receiving frame 31, the upper surface of the pressing frame 32 is located at substantially the same height as the upper surface of the protruding portion 314 of the receiving frame 31. The pressing frame 32 includes a pressing side clamping surface 321, a pressing side convex portion 322, and a pressing side through hole 323.

[0036] The pressing side clamping surface 321 is a surface that comes into contact with the sieve screen 21 when the sieve screen 21 is fixed. The pressing side clamping surface 321 constitutes the lower surface of the pressing frame 32. The pressing side clamping surface 321 is flat. However, the pressing side clamping surface 321 is provided with openings for the pressing side protrusions 322 and the pressing side through holes 323.

[0037] The pressing side protrusion 322 has a shape corresponding to the receiving side recess 312. The pressing side protrusion 322 has a truncated cone shape that decreases in diameter downward from the pressing side clamping surface 321. The pressing side protrusion 322 is configured to fit into the receiving side recess 312. The pressing side protrusion 322, together with the receiving side recess 312, sandwiches the sieve screen 21. The pressing side protrusion 322 is provided on the opening edge of the pressing side through hole 323. The pressing side protrusion 322 is provided so as to be coaxial with the pressing side through hole 323. The pressing side protrusion 322 is provided to a predetermined height from the pressing side clamping surface 321. The pressing side protrusion 322 may be integrally connected to the pressing side clamping surface 321 or may be a separate member.

[0038] The pressing side through hole 323 penetrates the pressing frame 32 in the up-down direction. The pressing side through hole 323 opens on the upper and lower surfaces of the pressing frame 32. The pressing side through hole 323 is provided at a position corresponding to the receiving side through hole 313. The pressing side through hole 323 is provided at a position that coincides with the receiving side through hole 313 when the pressing frame 32 is placed on the receiving frame 31. A plurality of pressing side through holes 323 are provided along the circumferential direction of the pressing frame 32 (see FIG. 2). The pressing side through hole 323 is provided between the outer edge and the inner edge of the pressing frame 32 in the radial direction of the pressing frame 32. The pressing side through hole 323 is provided near the center of the pressing side clamping surface 321 in the radial direction of the pressing frame 32. The pressing side through hole 323 in this embodiment is not formed with a screw thread, but may be formed with a screw thread. The pressing side through hole 323 has a diameter larger than that of the receiving side through hole 313, for example.

[0039] The fastening member 33 presses the receiving frame 31 and the pressing frame 32 against each other so as to fix the sieve screen 21 by the receiving frame 31 and the pressing frame 32. The fastening member 33 is, for example, a fastening bolt. The fastening member 33 is inserted into the receiving side through hole 313 and the pressing side through hole 323. That is, the fastening member 33 fastens the receiving frame 31 and the pressing frame 32 together. In this embodiment, a case where the fastening member 33 is a fastening bolt will be described, but the fastening member 33 is not limited thereto. The fastening member 33 may be, for example, a clamp, a clip, etc. as long as it can press the receiving frame 31 and the pressing frame 32 against each other.

[0040] FIG. 4 is a cross-sectional view showing the state in which the net fixing device of this embodiment is attached to the vibrating sieve device. The net fixing device 3 is disposed at the lower end of the upper sieve chamber 11. The net fixing device 3 is attached to the vibrating sieve device 1 with the receiving frame 31 on the bottom and the pressing frame 32 on the top. An annular holding plate 112 fixed to the inner peripheral surface of the upper sieve chamber 11 is provided on the pressing frame 32. An annular packing 19A having an L-shaped cross section is provided between the pressing frame 32 and the holding plate 112. A receiving tray 113 sandwiched between the upper sieve chamber 11 and the middle sieve chamber 12 is provided below the receiving frame 31. An annular packing 19B having a circular cross section is provided between the receiving frame 31 and the receiving tray 113. The net fixing device 3 is attached to the vibrating sieve device by being sandwiched between the holding plate 112 and the receiving tray 113. The tray 113 is provided with a plurality of spheres 114. When the upper sieve chamber 11 is vibrated by the vibration mechanism 17, the spheres 114 strike the sieve mesh 21, suppressing clogging of the sieve mesh 21. The tray 113 has a plurality of through holes having a smaller diameter than the spheres 114, and is configured to allow the powder material that has passed through the sieve mesh 21 to enter the middle sieve chamber 12.

[0041] 5 is a diagram showing the process of attaching a sieve screen to the screen fixture of this embodiment. The process of attaching the sieve screen proceeds in the order of (A)-(D). Referring to (A), first, the receiving frame 31 is placed on the flat base 5 with the receiving side clamping surface 311 facing up. Next, the sieve screen 21 is placed on the receiving frame 31, and the end of the sieve screen 21 is clamped between the clamp 6 and the base 5.

[0042] Referring to (B), the lifting bolt 7 is screwed into one of the multiple receiving side through holes 313 provided in the receiving frame 31, and the lower end of the lifting bolt 7 is abutted against the base 5. The lifting bolt 7 is, for example, a set screw. The receiving side through hole 313 into which the lifting bolt 7 is screwed is a threaded hole corresponding to the lifting bolt 7. The sieve screen 21 is provided with a hole for passing the lifting bolt 7. Then, by turning the lifting bolt 7, the axial force of the lifting bolt 7 raises the receiving frame 31, and the sieve screen 21 is pulled outward from the receiving frame 31. When a predetermined tension is applied to the sieve screen 21, the rotation of the lifting bolt 7 is stopped.

[0043] Referring to (C), the pressing frame 32 is placed on the receiving frame 31. At this time, the lifting bolt 7 is passed through the pressing side through hole 323, so that the pressing side convex portion 322 is fitted into the receiving side concave portion 312. Then, a fastening bolt (fastening member 33) is inserted into the receiving side through hole 313 and the pressing side through hole 323 into which the lifting bolt 7 is not inserted, and the receiving frame 31 and the pressing frame 32 are fastened together. As a result, the pressing frame 32 approaches the receiving frame 31, and further tension is applied to the sieve screen 21 due to the relationship with the protrusion 314 provided on the receiving frame 31. As a result, the appropriate tension to be applied is applied to the sieve screen 21. Then, the lifting bolt 7 is removed, and the fastening bolt (fastening member 33) is passed through the pressing side through hole 323 into which the lifting bolt 7 was inserted, and screwed into the receiving side through hole 313, thereby fastening the receiving frame 31 and the pressing frame 32. This completes the fastening of the receiving frame 31 and the pressing frame 32.

[0044] As shown in (D), the sieve net 21 protruding from the net fixture 3 is cut off, and the sieve net 21 is attached to the net fixture 3.

[0045] As described above, the net fixing device 3 of this embodiment can be attached to and detached from the vibrating sieve device 1, and can be handled separately from the vibrating sieve device 1. Therefore, it is not necessary to attach the sieve net directly to the vibrating sieve device, and the sieve net can be replaced by replacing the old net fixing device with a new net fixing device to which the sieve net has been previously attached. In addition, the sieve net 21 can be fixed or removed by moving the receiving frame 31 and the pressing frame 32 closer to or farther apart by the tightening member 33. Therefore, when replacing the sieve net 21, only the sieve net 21 can be replaced, and the receiving frame 31 and the pressing frame 32 can be reused. Therefore, according to the net fixing device 3, the sieve net 21 can be easily replaced, and the environmental load caused by replacing the sieve net 21 can be reduced.

[0046] In addition, in the net fixing device 3, the receiving side concave portion 312 and the pressing side convex portion 322 engage with each other while sandwiching the sieve net 21. Therefore, according to the net fixing device 3, the receiving frame 31 and the pressing frame 32 can firmly fix the sieve net 21, and the tension of the sieve net 21 is likely to be maintained even when vibration is applied. In addition, since the net fixing device 3 is provided with the protrusion 314, it is easy to impart the desired tension to the sieve net 21.

[0047] Furthermore, the net fixing device 3 does not require a lifting platform, a jig, or the like when attaching the sieve net 21 to the net fixing device. Therefore, the net fixing device 3 makes it even easier to replace the sieve net 21.

[0048] In addition, in the net fixing device 3, a fastening bolt is used as the tightening member 33 that presses the receiving frame 31 and the pressing frame 32 together. The hole for inserting the fastening bolt is shared with the through hole for raising and lowering the receiving frame 31 when attaching the sieve net 21. Therefore, according to the net fixing device 3, it is not necessary to provide a separate through hole for raising and lowering the receiving frame 31 when attaching the sieve net 21, and the net fixing device 3 can be made compact.

[0049] The embodiments of the present invention have been described above. The aspects that the present invention can adopt are not limited to the above-mentioned embodiments, and the present invention can adopt appropriate modified aspects as necessary.

[0050] For example, in the above embodiment, the configuration has been described in which the receiving-side clamping surface includes a receiving-side convex portion, and the holding-side clamping surface includes a holding-side concave portion. However, the concave-convex relationship between the receiving-side clamping surface and the holding-side clamping surface may be reversed. That is, the receiving-side clamping surface may include a receiving-side concave portion, and the holding-side clamping surface may include a holding-side convex portion.

[0051] In addition, the receiving side convex portion or the receiving side concave portion of the receiving side clamping surface and the pressing side concave portion or the pressing side convex portion of the pressing side clamping surface may not be provided. For example, when the vibration of the vibrating sieve device is small, and the sieve screen can be fixed by the tightening member, the receiving frame, and the pressing frame, the concave portion and the convex portion may not be provided.

[0052] In the above embodiment, the receiving frame includes the protruding portion, but the receiving frame does not necessarily have to include the protruding portion.

[0053] In the above embodiment, the lifting bolt is inserted into the receiving side through hole to lift the receiving frame when the sieve net is attached to the net fastener. However, the lifting bolt may be inserted into a through hole provided in the receiving frame separately from the receiving side through hole. In other words, the receiving frame may be provided with a dedicated through hole for inserting the lifting bolt, separate from the through hole for fastening to the pressing frame. [Explanation of symbols]

[0054] 1: Vibrating screen device 11: Upper sieve chamber 111: Discharge pipe 112: Holding plate 113: Tray 114: Sphere 12: Middle sieve chamber 13: Lower sieve chamber 14: Lid 141: Inlet 15: Support plate 16: Foundation 17: Vibration mechanism 18: Cushioning material 21, 22: Sieve net 3,4: Net fixture 31: Receiving slot 311: Receiving clamping surface 312: Receiving side recess 313: Receiving through hole 314:Protrusion 32: Pressing frame 321: Clamping surface on the clamping side 322: Presser side convex part 323: Through hole on the clamp side 33: Fastening member

Claims

1. A net fixing device that is detachable from a vibrating screen device and fixes a sieve net, The receiving frame and A pressing frame is disposed on the receiving frame and sandwiches the sieve screen together with the receiving frame; A net fixing device comprising: a fastening member for pressing the receiving frame and the pressing frame against each other so as to fix the sieve net by the receiving frame and the pressing frame.

2. 2. The net fastener according to claim 1, The receiving frame includes a receiving side clamping surface that is a surface that contacts the sieve screen when the sieve screen is fixed and that constitutes at least a part of an upper surface of the receiving frame, The pressing frame includes a pressing side clamping surface that clamps the sieve screen together with the receiving side clamping surface, The receiving side clamping surface includes a receiving side convex portion or a receiving side concave portion, The pressing side clamping surface includes a pressing side recess that corresponds to the receiving side convex portion and clamps the sieve screen together with the receiving side convex portion, or a pressing side convex portion that corresponds to the receiving side recess and clamps the sieve screen together with the receiving side recess, a mesh fixing device.

3. 2. The net fastener according to claim 1, The receiving frame has a circular ring shape, A receiving side clamping surface that is a surface that contacts the sieve screen when the sieve screen is fixed and that constitutes a part of the upper surface of the receiving frame; A net fixing device comprising: a protrusion provided in the receiving frame on the inside of the receiving clamping surface and protruding above the receiving clamping surface.

4. 2. The net fastener according to claim 1, The receiving frame is a net fixing device that includes a receiving side through hole that penetrates the receiving frame in the vertical direction and into which a bolt can be inserted.

5. The net fastener according to claim 4, The receiving frame includes a receiving side clamping surface that is a surface that contacts the sieve screen when the sieve screen is fixed and that constitutes at least a part of an upper surface of the receiving frame, The pressing frame includes a pressing side through hole that penetrates the pressing frame in the vertical direction and is provided at a position corresponding to the receiving side through hole, and a pressing side clamping surface that clamps the sieve screen together with the receiving side clamping surface, The receiving-side through hole opens to the receiving-side clamping surface, The pressing-side through-hole opens into the pressing-side clamping surface, The tightening member includes a fastening bolt, and is inserted into the receiving side through hole and the pressing side through hole.

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