Powder sieve device

Abstract

To provide a powder sieve device with improved sieving efficiency.SOLUTION: The present invention includes a frame body whose periphery is surrounded by a side wall, a sieve body stretched over a top surface of the frame body, a net body stretched over a bottom surface of the frame body, a cleaner body disposed on an upper surface side of the net body so as to be movable in a horizontal direction, and a shaking device that vibrates the frame body in a horizontal direction, wherein the net body is a flat top wire net, the frame body is divided into a plurality of space chambers by an intermediate wall, and one cleaner body is provided in each of the plurality of space chambers. In the powder sieve device, the frame has a rectangular shape having four corners in a plan view, and the frame and the mesh are joined at or near the four corners of the frame.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a powder sieve device comprising a frame body surrounded by side walls, a sieve body stretched across the top surface of the frame body, a mesh body stretched across the bottom surface of the frame body, a cleaner body arranged on the upper side of the mesh body, and a shaking device that vibrates the frame body horizontally. [Background technology]

[0002] A configuration that has already been used as a sieve device for powder includes a frame body surrounded by side walls, a sieve body stretched across the top surface of the frame body, a mesh body stretched across the bottom surface of the frame body, a cleaner body placed on the upper side of the mesh body, and a shaking device that vibrates the frame body horizontally.

[0003] The configurations of the frame, sheave body, and mesh body are described, for example, in Patent Document 1. As shown in Fig. 20, the frame body 50 described in Patent Document 1 is rectangular in plan view and is divided into six 2x3 space chambers by intermediate walls. The sheave body 9 described in Patent Document 1 is attached to the top surface of the frame body 50 with an adhesive, and the mesh body 40 described in Patent Document 1 is a crimped wire mesh that is fitted and fixed to the bottom surface of the frame body 50.

[0004] The cleaner body described in Patent Document 1 as the "second cleaner 32" is movably arranged on the upper surface of the mesh body 40, and is, for example, a sieve cleaner. More specifically, it is, for example, a sieve cleaner (Shuriken HSC-01) manufactured by Tanaka Sanjiro Shoten. One "second cleaner 32" (sieve cleaner) is provided in each of the six chambers.

[0005] An example of a shaking device that vibrates the frame 50 in the horizontal direction is the "Aluminum Scayer Sifter SF-AL Type" manufactured by Meiji Machinery Co., Ltd. This shaking device can be used by stacking frames (sieve frames) (up to 30 layers) and can move them in a circular motion in a horizontal plane (called the free swing method). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2008-18375 Summary of the Invention [Problem to be solved by the invention]

[0007] The inventors of the present invention discovered that by changing the mesh body, which was previously a crimped wire mesh, to a flat-top wire mesh, the screening efficiency is significantly improved (in particular, clogging is effectively suppressed).

[0008] Crimped wire mesh is a wire mesh made by combining wires that have been crimped into a wavy shape using gears, as shown in Figure 21, and flat-top wire mesh is a wire mesh with a flat surface, as shown in Figure 22.

[0009] The reason crimped mesh has traditionally been used for this mesh body is because of its compatibility with the shape of the sieve cleaner placed on top. Conventional sieve cleaners come in a variety of shapes, including triangular and square, but a single protrusion called a rivet (see Figure 23) protruding from the center of the underside of the sieve cleaner catches on the unevenness of the crimped wire mesh surface, creating a swinging motion (a see-saw-like tilting motion that strikes the sieve body), which has the advantage of improving sieving efficiency (especially preventing clogging). However, when using a sieve cleaner that does not swing around the rivet but instead improves sieving efficiency by impacting the frame with horizontal movement, such as the Shuriken HSC-01, there is no particular disadvantage to not using crimped wire mesh.

[0010] The inventors of this invention have analyzed that when a flat-top wire mesh is used, the horizontal movement of the floating sieve cleaner becomes smoother, the speed at which the sieve cleaner moves within the chamber increases, the degree of impact when the sieve cleaner collides with the frame increases, and the vibration of the frame caused by the collision improves the sieving efficiency.

[0011] Furthermore, conventional mesh bodies are joined at multiple points on the parallel sides of the frame body and the intermediate wall (see Figs. 2 and 19). The present inventors discovered that when a flat-top wire mesh is used, by devising the joints between the mesh body and the frame body and the intermediate wall, it is possible to increase the amplitude of vibration of the frame body and the intermediate wall when the sieve cleaner collides with them, thereby further improving the sieving efficiency.

[0012] The present invention has been made based on the above findings, and an object of the present invention is to provide a powder sieving device with improved sieving efficiency. [Means for solving the problem]

[0013] The present invention is a powder sieve device comprising a frame body surrounded by side walls, a sieve body stretched across the top surface of the frame body, a mesh body stretched across the bottom surface of the frame body, a cleaner body arranged on the upper side of the mesh body so as to be movable horizontally, and a shaking device that vibrates the frame body horizontally, wherein the mesh body is a flat-top wire mesh, the frame body is divided into a plurality of space chambers by intermediate walls, one cleaner body is provided in each of the plurality of space chambers, the frame body is rectangular in shape with four corners in a plan view, and the frame body and the mesh body are joined at or near the four corners of the frame body.

[0014] According to the present invention, the use of a flat-top wire mesh instead of a crimped wire mesh improves sieving efficiency. This is thought to be because the flat-top wire mesh increases the moving speed of the cleaner body, increasing the degree of impact when the cleaner body collides with the side wall, and the vibration of the frame caused by this collision improves sieving efficiency (especially by effectively suppressing clogging).

[0015] The frame body is divided into a plurality of chambers by intermediate walls, and one cleaner body is provided for each of the plurality of chambers. Therefore, by adjusting the size of each chamber to match the size of a commercially available cleaner body, for example, the screening efficiency can be further improved.

[0016] Furthermore, the frame body is rectangular in shape with four corners when viewed in a plane, and the frame body and the mesh body are joined at or near the four corners of the frame body, so that the amplitude of vibration of the frame body and the intermediate wall when the cleaner body collides with the frame body and the intermediate wall can be made larger, thereby further improving the screening efficiency.

[0017] The inventors of the present invention have actually confirmed that when the frame body and the mesh body are joined only at or near the four corners of the frame body, the amplitude of vibration of the frame body and the intermediate wall when the cleaner body collides with the frame body and the intermediate wall can be made larger, thereby further improving the screening efficiency.

[0018] Furthermore, according to the inventors' findings, even if the frame body and the mesh body are additionally joined at or near the connection between the frame body and the intermediate wall, a practically sufficient screening efficiency can be achieved.

[0019] The inventors of the present invention have actually confirmed that even when the frame body and the mesh body are joined only at or near the four corners of the frame body and at or near the connection between the frame body and the intermediate wall, the amplitude of vibration of the frame body and the intermediate wall when the cleaner body collides with the frame body and the intermediate wall can be made larger, thereby further improving the screening efficiency.

[0020] In the above-mentioned features, the mesh body joined at or near the connection between the frame body and the intermediate wall may be the intermediate wall instead of the frame body. That is, even if the intermediate wall and the mesh body are additionally joined at or near the connection between the frame body and the intermediate wall, a practically sufficient screening efficiency can be achieved. In this case, it is preferable that the intermediate wall and the mesh body are joined only at or near the connection between the frame body and the intermediate wall.

[0021] The intermediate wall may have a branch portion in plan view. In such a case, even if the mesh body and the intermediate wall are joined at the branch portion, a practically sufficient screening efficiency can be achieved. In this case, it is preferable that the intermediate wall and the mesh body are joined only at the branch portion. Alternatively, by combining the above-mentioned features, it is preferable that the intermediate wall and the mesh body are joined only at the branch portion and at or near the connection portion between the frame body and the intermediate wall.

[0022] For example, the frame may be divided into six compartments, 2×3 in length and width, or into four compartments, 2×2 in length and width, or into eight compartments, 2×4 in length and width.

[0023] Regarding the detailed specifications of the mesh body, the present inventors have verified that the usefulness of the present invention is recognized when the void ratio is 25 to 95%, the wire diameter is 1.0 to 4.5 mm, the mesh number is 1 to 6 meshes / inch, and the mesh size is 3 to 40 mm. Furthermore, within these ranges, the void ratio is preferably 45 to 85%, the wire diameter is 1.3 to 3.5 mm, the mesh number is 1.5 to 4 meshes / inch, and the mesh size is 5 to 25 mm, and more preferably the void ratio is 65 to 75%, the wire diameter is 1.8 to 2.5 mm, the mesh number is 2 to 2.5 meshes / inch, and the mesh size is 7 to 15 mm. [Effects of the Invention]

[0024] According to the present invention, the use of a flat-top wire mesh instead of a crimped wire mesh improves sieving efficiency. This is believed to be because the flat-top wire mesh increases the moving speed of the cleaner body, increasing the impact when the cleaner body collides with the side wall, and the vibration of the frame body caused by the collision improves sieving efficiency. The frame body is divided into multiple chambers by intermediate walls, and one cleaner body is provided for each of the multiple chambers. Therefore, the sieving efficiency can be further improved by adjusting the size of each chamber to match the size of a commercially available cleaner body, for example. Furthermore, the frame body has a rectangular shape with four corners in a plan view, and the frame body and the mesh body are joined at or near the four corners of the frame body. This increases the amplitude of vibration of the frame body and the intermediate wall when the sieve cleaner collides with the frame body and the intermediate wall, thereby further improving sieving efficiency. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a photograph showing the upper surface side of a frame body (including a sieve body, a mesh body, and a cleaner body) in a powder sieve device according to a comparative example of the present invention. [Figure 2] 2 is a photograph showing the bottom side of the frame body (including the sieve body, the mesh body, and the cleaner body) of FIG. 1. [Figure 3]2 is a photograph of the frame body (including the sieve body, mesh body, and cleaner body) of FIG. 1 after one month of use. [Figure 4] 4 is a photograph corresponding to FIG. 3, showing a conventional example using a crimped wire mesh. [Figure 5] 2 is a photograph of the frame body (including the sieve body, mesh body, and cleaner body) of FIG. 1 after three months of use. [Figure 6] 6 is a photograph corresponding to FIG. 5 of a conventional example using crimped wire mesh. [Figure 7] 7 is a graph showing the clogging rate determined by image processing of the photographs of FIGS. 5 and 6. [Figure 8] 3A to 3D are schematic diagrams showing fastening positions of fasteners in the first to third embodiments of the present invention and corresponding comparative examples. [Figure 9] 10A to 10C are schematic diagrams showing fixing positions of fasteners in the fourth to sixth embodiments of the present invention and corresponding comparative examples. [Figure 10] 1 is a graph showing the clogging rates of the first to sixth embodiments of the present invention and the corresponding comparative examples. [Figure 11] 1 is a photograph of a first embodiment of the present invention. [Figure 12] 10 is a photograph of a second embodiment of the present invention. [Figure 13] 10 is a photograph showing a third embodiment of the present invention. [Figure 14] 10 is a photograph of a fourth embodiment of the present invention. [Figure 15] 10 is a photograph of a fifth embodiment of the present invention. [Figure 16] 10 is a photograph of a sixth embodiment of the present invention. [Figure 17] 10 is a schematic diagram showing fastening positions for each embodiment of the second modified example of the present invention and corresponding comparative examples. FIG. [Figure 18] 17(c) is a photograph of the modified example shown in FIG. [Figure 19] 17(d) is a photograph of the comparative example shown in FIG. [Figure 20]FIG. 1 is a schematic diagram showing a frame body (including a sieve body, a mesh body, and a cleaner body) in Patent Document 1 (approximately corresponding to FIG. 1 of Patent Document 1). [Figure 21] This is an enlarged photograph of crimped wire mesh. [Figure 22] This is a close-up photo of a flat-top wire mesh. [Figure 23] 1 is a photograph showing a conventional example of a sieve cleaner with a stud arranged in the center. DETAILED DESCRIPTION OF THE INVENTION

[0026] First, a comparative example of the present invention will be described with reference to the drawings.

[0027] (Configuration of Comparative Example) Figure 1 is a photograph showing the top side of frame body 101 (including sieve body 102, mesh body 103 and cleaner body 104) in a powder sieve device related to a comparative example of the present invention, and Figure 2 is a photograph showing the bottom side of frame body 101 (including sieve body 102, mesh body 103 and cleaner body 104).

[0028] As shown in Figures 1 and 2, this powder sieve device comprises a frame body 101 surrounded on all four sides by side walls 101s, a sieve body 102 stretched across the top surface of the frame body 101, a mesh body 103 stretched across the bottom surface of the frame body 101, and a cleaner body 104 arranged on the upper side of the mesh body 103 (the lower side of the sieve body 102) so as to be movable horizontally.

[0029] As shown in Figures 1 and 2, the frame 101 is rectangular in plan view and is divided into six 2x3 space chambers by intermediate walls 101m. The overall size of the frame 101 is 57 cm long, 50 cm wide, and 2.2 cm high, and each space chamber is 16.5 cm long and 22.4 cm wide. The frame 101 and the intermediate walls 101m are made of wood, and the cross section of the frame 101 is square or rectangular (for example, approximately 2.2 cm x 10 mm to 25 mm), and the cross section of the intermediate walls 101m is rectangular (for example, approximately 2.2 cm x 10 mm to 15 mm).

[0030] The sheave body 102 is attached to the top surface of the frame body 101 with an adhesive, and has an opening of 118 μm.

[0031] The mesh body 103 is a flat-top wire mesh made of stainless steel (or iron), with a void ratio of 65 to 75%, a wire diameter of 1.8 to 2.5 mm, a mesh count of 2 to 2.5 meshes per inch, and an opening size of 7 to 15 mm.

[0032] The mesh (openings) of the mesh body 103 have a square shape, but the mesh shape may also be rectangular, rhombic, hexagonal (tortoiseshell), or the like.

[0033] As shown in FIG. 2, the mesh body 103 is fixed to the frame body 101 in a well-balanced manner via 16 fasteners 105 arranged in a 4×4 pattern.

[0034] The void ratio = {(opening) 2 / (opening + wire diameter) 2}×100 is the correlation.

[0035] The cleaner body 104 is a sieve cleaner, more specifically, a sieve cleaner (Shuriken HSC-01) manufactured by Tanaka Sanjiro Shoten. One cleaner body 104 is provided in each of the six chambers.

[0036] The powder sieve device is equipped with a shaking device (not shown) on which a frame 101 (including a sieve body 102, a mesh body 103, and a cleaner body 104) is mounted. The shaking device vibrates the frame 101 (including a sieve body 102, a mesh body 103, and a cleaner body 104) by circularly moving it horizontally (within a horizontal plane). More specifically, the shaking device is an "Aluminum Skeyer Sifter SF-AL Type" manufactured by Meiji Machinery Co., Ltd. The shaking device can be used by stacking the frame bodies 101 (up to 30 layers).

[0037] (Effects of Comparative Example) The powder sieving device of the comparative example described above also improves sieving efficiency by using a flat-top wire mesh instead of a crimped wire mesh as the mesh body 103. This is thought to be because the adoption of a flat-top wire mesh increases the moving speed of the cleaner body 104, increasing the degree of impact when the cleaner body 104 collides with the side wall 101s and the intermediate wall 101m, and the vibration of the frame body 101 caused by this collision improves sieving efficiency (especially by effectively suppressing clogging).

[0038] 3 is a photograph of the frame 101 (including the sieve body 102, mesh body 103, and cleaner body 104) after one month of use when the configuration of this comparative example was used in a shaking device that performs the fourth step in the braking process of grinding wheat. The entire image appears almost uniformly whitish, but even a slight impact on the frame 101 caused the powder to fall off, and almost no clogging was observed.

[0039] Figure 4 shows a photograph of the frame (including the sieve body 102, mesh body, and cleaner body 104) of a conventional example using crimped wire mesh after one month of use in a shaking device that performs the fourth step in the braking process of crushing wheat. The frame appears whitish and mottled, indicating clogging, and the powder could not be removed without scrubbing with a cleaning brush.

[0040] Furthermore, Figure 5 is an example of a photograph of the frame body 101 (including the sieve body 102, the mesh body 103, and the cleaner body 104) after three months of use (the usage pattern is the same as that described for Figure 3). The average clogging rate obtained by image processing of multiple examples including this photograph was 30.9%.

[0041] On the other hand, Figure 6 shows an example of a photograph of a frame body (including the sieve body 102, mesh body, and cleaner body 104) similar to the conventional example in Figure 4 after three months of use (the usage pattern is the same as that described for Figure 4). The average clogging rate obtained by image processing of multiple examples including this photograph was 65.1%.

[0042] Fig. 7 is a graph comparing the clogging rates of both devices. As is clear from Fig. 7, the powder sieve device of the comparative example also effectively suppresses clogging.

[0043] In the comparative example of the powder sieve device, the frame 101 is also divided into a plurality of chambers by intermediate walls 101m, and one cleaner body 104 is provided for each of the plurality of chambers. This allows the size of each chamber to be adjusted to match the size of a commercially available cleaner body 104 (or conversely, an appropriate size cleaner body 104 may be selected based on the size of each chamber), further improving the sieving efficiency. The intermediate walls 101m also have the effect of preventing the sieve body 102 from sagging due to the weight of the powder.

[0044] (Configurations of the first to third embodiments) In the comparative example described above, as shown in FIG. 2, the mesh body 103 was joined to the frame body 101 and the intermediate wall 101m by fasteners 105 at four locations on each of the four parallel sides of the frame body 101 and the intermediate wall 101m extending in the left-right direction (in FIG. 2) (a total of 16 locations).

[0045] Each fastener 105 is elongated in plan view and is made up of a metal piece with a long side of 46 mm, a short side of 10 mm, and a thickness of 1 mm that is arranged along each side of the object to be fixed, and two screws that fix the metal piece to the frame body 101 or the intermediate wall 101m through the mesh body 103. The two screws are arranged symmetrically and are fixed to the frame body 101 or the intermediate wall 101m in a positional relationship such that the two wires of the mesh body 103 pass between them.

[0046] In contrast to this, in the first to third embodiments of the present invention, although the same fasteners 105 as those in the comparative example are used, the number and fixing positions thereof are changed.

[0047] Specifically, in the first embodiment, as shown in Fig. 8(a), the frame body 101 and the mesh body 103 are joined only near the four corners of the frame body 101. (In this case too, the two screws of each fastener 105 are fixed to the frame body 101 in a positional relationship such that the two wires of the mesh body 103 pass between them (see Fig. 17).) In this specification, "near the corners" refers to an area where the shortest distance between the edge of a corner and the edge of a fastener in a plan view is equal to or less than 1.5 times the width of the frame body 101, particularly equal to or less than 1.0 times the width of the frame body 101.

[0048] In the second embodiment, as shown in Fig. 8(b), the frame body 101 and the mesh body 103 are joined only near the four corners of the frame body 101 and at the connection portions (six locations) between the frame body 101 and the intermediate wall 101m. (In this case, too, the two screws of each fastener 105 are fixed to the frame body 101 or the intermediate wall 101m in a positional relationship such that the two wires of the mesh body 103 pass between them (see Fig. 17).)

[0049] In the third embodiment, as shown in Fig. 8(c), the frame body 101 and the mesh body 103 are joined only near the four corners of the frame body 101 and at the connection portions (six locations) between the frame body 101 and the intermediate wall 101m, and further, the intermediate wall 101m and the mesh body 103 are joined at the branching portions (two locations) of the intermediate wall 101m. (In this case, too, the two screws of each fastener 105 are fixed to the frame body 101 or the intermediate wall 101m in a positional relationship such that the two wires of the mesh body 103 pass between them (see Fig. 17).)

[0050] For visual comparison with the first to third embodiments, the corresponding diagrams of the comparative example described above for FIGS. 8(a) to 8(c) are shown in FIG. 8(d).

[0051] (Configurations of the fourth to sixth embodiments) In the first to third embodiments, similar to the comparative examples described above (see Figures 1 to 6), the overall size of the frame body 101 is 50 cm in length, 50 cm in width, and 2.2 cm in height, and the size of each space chamber is 16.3 cm in length and 28.3 cm in width (called a normal frame).

[0052] In contrast to this, in the fourth to sixth embodiments, the overall size of the frame body 101 is 56 cm long, 62 cm wide, and 2.2 cm high, and the size of each chamber is 16.3 cm long and 28.4 cm wide (called a wide frame).

[0053] In the fourth embodiment, as in the first embodiment, as shown in Fig. 9(a), the frame body 101 and the mesh body 103 are joined only near the four corners of the frame body 101. (In this case, too, the two screws of each fastener 105 are fixed to the frame body 101 in a positional relationship such that the two wires of the mesh body 103 pass between them (see Fig. 17).)

[0054] In the fifth embodiment, as in the second embodiment, as shown in Fig. 9(b), the frame body 101 and the mesh body 103 are joined only near the four corners of the frame body 101 and at the connection portions (six locations) between the frame body 101 and the intermediate wall 101m. (In this case, too, the two screws of each fastener 105 are fixed to the frame body 101 or the intermediate wall 101m in a positional relationship such that the two wires of the mesh body 103 pass between them (see Fig. 17).)

[0055] In the sixth embodiment, as in the third embodiment, as shown in Fig. 9(c), the frame body 101 and the mesh body 103 are joined only near the four corners of the frame body 101 and at the connection portions (six locations) between the frame body 101 and the intermediate wall 101m, and further, the intermediate wall 101m and the mesh body 103 are joined at branch portions (two locations) of the intermediate wall 101m. (In this case, too, the two screws of each fastener 105 are fixed to the frame body 101 or the intermediate wall 101m in a positional relationship such that the two wires of the mesh body 103 pass between them (see Fig. 17).)

[0056] For visual comparison with the fourth to sixth embodiments, the corresponding comparative examples to those in FIGS. 9(a) to 9(c) are shown in FIG. 9(d).

[0057] (Effects (Evaluation) of the First to Sixth Embodiments) Under the test conditions shown in Table 1 below, it was confirmed that the first to sixth embodiments effectively suppressed the occurrence of clogging compared to the corresponding comparative examples. The results are shown in a graph in Figure 10. The mesh size was 112 μm. TIFF2026029081000002.tif23155

[0058] As can be seen from the results in Figure 10, according to the first and fourth embodiments, the frame body 101 and the mesh body 103 are joined only near the four corners of the frame body 101, so the amplitude of vibration of the frame body 101 and the intermediate wall 101m when the cleaner body 104 collides with the frame body 101 and the intermediate wall 101m can be made larger, thereby further improving the screening efficiency.

[0059] Furthermore, as can be seen from the results in Figure 10, in the second and fifth embodiments, the frame body 101 and the mesh body 103 are joined only near the four corners of the frame body 101 and at the connection between the frame body 101 and the intermediate wall 101m, so the amplitude of vibration of the frame body 101 and the intermediate wall 101m when the cleaner body 104 collides with the frame body 101 and the intermediate wall 101m can be made larger, thereby further improving the screening efficiency.

[0060] Furthermore, as can be seen from the results in Figure 10, in the third and sixth embodiments, the frame body 101 and the mesh body 103 are joined only near the four corners of the frame body 101 and at the connection between the frame body 101 and the intermediate wall 101m, and the intermediate wall 101m and the mesh body 103 are joined only at the branching portion of the intermediate wall 101. Therefore, the amplitude of vibration of the frame body 101 and the intermediate wall 101m when the cleaner body 104 collides with the frame body 101 and the intermediate wall 101m can be made larger, thereby further improving the screening efficiency.

[0061] Photographs of the first to sixth embodiments are shown in FIGS.

[0062] (Variation 1) In each of the above embodiments, the mesh body 103 is joined at the connection between the frame body 101 and the intermediate wall 101m to the frame body 101, but instead, it may be joined to the intermediate wall 101m, or to both the frame body 101 and the intermediate wall 101m. It has been confirmed that such a modified example can also achieve a screening efficiency comparable to that of the corresponding embodiments.

[0063] (Variation 2) In each of the above embodiments, the frame 101 is divided into six chambers, 2 x 3 in length and width, but is not limited to this and may be divided into four chambers, for example, 2 x 2 in length and width. It has been confirmed that even with such a modified example, it is possible to achieve the same level of sieving efficiency as the corresponding embodiments.

[0064] In the case where the room is divided into four compartments, 2x2 in length and width, the diagrams corresponding to the respective modified examples corresponding to the embodiments of Figures 8(a) to 8(c) and 9(a) to 9(c) are shown in Figures 17(a) to 17(c). Also, the diagrams corresponding to the comparative examples of the modified examples corresponding to the comparative examples of Figures 8(d) and 9(d) are shown in Figure 17(d).

[0065] Figure 18 is a photograph of the modified example shown in Figure 17(c), and Figure 19 is a photograph of the comparative example shown in Figure 17(d).

[0066] (Variation 3) In the second, third, fifth and sixth embodiments and the corresponding variants 1 and 2, the mesh body 103 is joined at the connection between the frame body 101 and the intermediate wall 101m. However, an alternative embodiment in which the mesh body 103 is joined near the connection between the frame body 101 and the intermediate wall 101m is also within the scope of the present invention, at least at the time of filing this application.

[0067] Here, "near the connection" refers to the area where the shortest distance between the boundary edge of the connection (the part that appears to intersect and overlap) and the edge of the fastener in a planar view is less than 0.5 times the width of the intermediate wall 101m, particularly the area where the boundary edge of the connection and the edge of the fastener are adjacent to each other. [Explanation of symbols]

[0068] 9 Sheave body (conventional configuration) 32 Second cleaner (conventional configuration) 40 mesh body (conventional configuration: crimped wire mesh) 50 Frame (conventional configuration) 101 Frame 101s side wall 101m intermediate wall 102 Sheave body 103 Mesh (Flat Top Wire Mesh) 104 Cleaner body (sieve cleaner) 105 Fasteners

Claims

1. a frame surrounded by side walls; a sheave body stretched across the top surface of the frame body; a mesh body stretched across the bottom surface of the frame body; a cleaner body arranged on the upper surface side of the mesh body so as to be horizontally movable; a shaking device that vibrates the frame in a horizontal direction; Equipped with The mesh is a flat-top wire mesh, The frame body is divided into a plurality of chambers by intermediate walls, The cleaner body is provided in each of the plurality of chambers, The frame body has a rectangular shape having four corners in a plan view, The frame and the mesh are joined at or near the four corners of the frame. A powder sieve device characterized by:

2. The frame and the mesh are joined only at or near the four corners of the frame.

2. The powder sieve device according to claim 1.

3. The frame body and the mesh body are also joined at or near the connection portion between the frame body and the intermediate wall.

2. The powder sieve device according to claim 1.

4. The frame and the mesh are joined only at or near the four corners of the frame and at or near the connection between the frame and the intermediate wall.

4. The powder sieve device according to claim 3.

5. The intermediate wall and the mesh body are joined at or near the connection portion between the frame body and the intermediate wall.

2. The powder sieve device according to claim 1.

6. The intermediate wall and the mesh body are joined only at or near the connection portion between the frame body and the intermediate wall.

6. The powder sieve device according to claim 5.

7. the intermediate wall has a branched portion in a plan view, The mesh body and the intermediate wall are joined at the branch portion.

5. The powder sieve device according to claim 1, wherein the powder sieve device is a powder sieve.

8. The mesh body and the intermediate wall are joined only at the branch portion.

8. The powder sieve device according to claim 7.

9. The frame is divided into six compartments, 2x3 in length and width.

8. The powder sieve device according to claim 7.

10. The frame is divided into four compartments, 2x2 in length and width.

8. The powder sieve device according to claim 7.

Images