Sieve plate pressing device and screening machine thereof

Abstract

The utility model provides a sieve plate hold-down device which comprises a fixed wedge block, a sliding wedge block and a locking mechanism, the sliding wedge block is arranged in a sliding mode relative to the fixed wedge block, the fixed wedge block is provided with a first wedge face, the sliding wedge block is provided with a second wedge face and a hold-down face, the hold-down face is located on the back face of the second wedge face, and the second wedge face abuts against the first wedge face. The sliding wedge block is driven by the locking mechanism to slide relative to the fixed wedge block, so that the sliding wedge block moves along the height and is positioned; the locking mechanism comprises a locking bolt and an anti-loosening assembly, a long-strip-shaped hole formed in the height direction is formed in the sliding wedge block, the locking bolt penetrates through the long-strip-shaped hole and is connected with the anti-loosening assembly, and the sliding wedge block is pulled to slide through the locking bolt. The sliding wedge blocks are used for pressing the filtering sieve plate, the locking screw rods are parallel to the pressing plane, the vibration direction is perpendicular to the direction of the locking screw rods in the vibration process, and therefore the sliding wedge blocks and the locking screw rods are not prone to loosening in the vibration process.

Description

Technical Field

[0001] The utility model relates to the technical field of screening equipment, in particular to a screen plate pressing device. Background Art

[0002] After steel smelting, a lot of slag will be produced. After being crushed, these slags can be used as raw materials for cement production. On the one hand, it reduces the cost of slag disposal, and secondly, it solves the supply problem of some raw materials in the cement production process, not only reducing pollution but also reducing the production cost of cement, greatly improving economic benefits. In the process of treating waste gas slag, the slag needs to be initially crushed and screened. The fine material screened directly enters the mill for grinding, and some coarser slag needs to be crushed for the second time.

[0003] In the existing screening equipment, during the installation process, the sieve plate is often pressed against the bottom of the frame of the screening equipment by angle irons, and the angle irons are fixed to the inner wall of the screening equipment by welding. In the subsequent screening operation, the welds of this fixing method are prone to cracking under strong vibration, which eventually causes the angle irons to detach from the screening equipment and fail to achieve the effect of pressing the sieve plate. Secondly, when the sieve plate needs to be replaced, a cutting machine is required to cut the sieve plate from the screening equipment, and after replacing it with a new sieve plate, it needs to be re-welded, which is troublesome to operate and has a poor pressing effect. In addition, the pressing method in which bolts are directly pressed against the top of the sieve plate is also prone to loosening under the high-frequency vibration of the screening mechanism, resulting in poor pressing effect.

[0004] In summary, there is an urgent need for a screen plate pressing device to solve or at least partially solve the problems existing in the prior art. Utility Model Content

[0005] The utility model aims to provide a screen plate pressing device, aiming to solve the problem that the existing screen plate pressing structure cannot achieve good pressing effect and anti-loosening effect. The specific technical solution is as follows:

[0006] A screen plate clamping device comprises a fixed wedge block, a sliding wedge block and a locking mechanism. The sliding wedge block is slidably arranged relative to the fixed wedge block. The fixed wedge block is provided with a first wedge surface. The sliding wedge block is provided with a second wedge surface and a clamping surface. The clamping surface is located on the back of the second wedge surface. The second wedge surface and the first wedge surface abut against each other. The sliding wedge block is driven to slide relative to the fixed wedge block by the locking mechanism, thereby making the sliding wedge move and position along the height. The locking mechanism comprises a locking bolt and an anti-loosening assembly. The sliding wedge block is provided with an elongated hole arranged along the height direction. The locking bolt passes through the elongated hole and is connected to the anti-loosening assembly. The sliding wedge block is pulled to slide by the locking bolt.

[0007] Furthermore, the anti-loosening assembly includes a first nut, a second nut and an anti-loosening sleeve, the first nut and the second nut are both threadedly connected to the locking bolt, and the second nut is located on the side of the first nut away from the sliding wedge, the anti-loosening sleeve is located between the first nut and the second nut, and the anti-loosening sleeve is sleeved on the outside of the first nut, the anti-loosening sleeve is passed through the locking bolt, and a blocking block is provided on the anti-loosening sleeve, and a long groove is provided on the locking bolt along the length direction of the locking bolt, and the blocking block is slidably arranged in the long groove.

[0008] Furthermore, a plum blossom pattern for clamping the first nut is provided in the anti-loosening sleeve.

[0009] Furthermore, the anti-loosening assembly includes a first nut and a second nut, both of which are threadedly connected to the locking bolt, and the second nut is located on a side of the first nut away from the sliding wedge.

[0010] Furthermore, the anti-loosening assembly also includes an anti-loosening pin. A through hole is provided on the locking bolt along the radial direction of the locking bolt. The through hole is located on the side of the second nut away from the sliding wedge block, and the anti-loosening pin is inserted in the through hole.

[0011] Furthermore, an extension block is provided on the sliding wedge block, and the extension block is fixedly connected to the side of the sliding wedge block, and the bottom surface of the extension block is flush with the pressing surface of the sliding wedge block.

[0012] Furthermore, a reinforcing rib is provided on the fixed wedge block, and the reinforcing rib is located on a side of the fixed wedge block away from the first wedge surface.

[0013] The utility model also provides a screening machine, including a frame, a filter screen plate, a vibration generating device and the above-mentioned screen plate pressing device, the vibration generating device is installed on the upper part of the frame, the filter screen plate is arranged on the frame and is located at the bottom of the frame, the screen plate pressing device is arranged at the bottom of the frame, the fixed wedge block of the screen plate pressing device is fixedly arranged on the frame, the sliding wedge block is between the filter screen plate and the fixed wedge block, the second wedge surface of the sliding wedge block and the first wedge surface are abutted against each other, the pressing surface of the sliding wedge block is pressed against the filter screen plate, the anti-loosening component is fixed on the side wall surface of the frame, the threaded end of the locking bolt passes through the elongated hole and cooperates with the anti-loosening component, and the nut end of the locking bolt is abutted against the hole wall surface of the elongated hole.

[0014] Furthermore, a reinforcing guard plate is provided on the side wall of the frame, and the end of the locking bolt away from the sliding wedge passes through the side wall of the frame and is connected to the anti-loosening component, the anti-loosening component abuts against the reinforcing guard plate, and the reinforcing guard plate and the screen plate clamping device are arranged one by one.

[0015] Furthermore, a limit block is provided on the frame, and the limit block is located at the end of the filter screen plate and abuts against the end of the filter screen plate.

[0016] The application of the technical solution of the utility model has the following beneficial effects:

[0017] The sliding wedge is driven by the locking bolt to move, so that the pressing surface is away from the fixed wedge and close to the filter screen plate that needs to be tightened to tighten the filter screen plate. Under the action of the anti-loosening component, the locking bolt is limited to prevent the locking bolt from moving back. When the filter screen plate is in the vibrating process, because the vibration direction of the filter screen plate is perpendicular to the locking bolt, the force exerted on the locking bolt does not change significantly, and the locking bolt is not easy to loosen, and can continue to have a good pressing effect on the filter screen plate. Secondly, by removing the anti-loosening component, the sliding wedge slides relative to the fixed wedge, and the pressing surface moves in the direction away from the filter screen plate, so that the filter screen plate can be easily removed, and the disassembly and assembly of the filter screen plate is convenient.

[0018] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of a screen plate pressing device embodiment 1 of the utility model;

[0021] Figure 2 It is a cross-sectional view of Example 1 of a screen plate pressing device of the utility model;

[0022] Figure 3 This is one of the exploded views of Embodiment 1 of a screen plate pressing device of the utility model;

[0023] Figure 4 yes Figure 3 A partial enlarged view of the middle A;

[0024] Figure 5 This is the second exploded view of Embodiment 1 of a screen plate pressing device of the utility model;

[0025] Figure 6 This is a schematic diagram of the overall structure of a screen plate pressing device embodiment 2 of the utility model;

[0026] Figure 7 The utility model is a schematic diagram of the overall structure of a screening machine.

[0027] Among them, 1. Screen plate clamping device; 11. Fixed wedge block; 111. First wedge surface; 112. Reinforcing rib; 12. Sliding wedge block; 121. Second wedge surface; 122. Clamping surface; 123. Long strip hole; 124. Extension block; 13. Locking mechanism; 131. Locking bolt; 1311. Long groove; 132. Anti-loosening assembly; 1321. First nut; 1322. Second nut; 1323. Anti-loosening sleeve; 1324. Block; 1325. Anti-loosening pin; 2. Frame; 21. Reinforced guard plate; 22. Limiting block; 3. Filter screen plate; 4. Vibration generating device. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below, and preferred embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0030] Embodiment 1:

[0031] See also Figure 1-Figure 7 The present embodiment provides a screen plate clamping device, including a fixed wedge block 11, a sliding wedge block 12 and a locking mechanism 13. The sliding wedge block 12 is slidably arranged relative to the fixed wedge block 11. The fixed wedge block 11 has a first wedge surface 111, and the sliding wedge block 12 has a second wedge surface 121 and a clamping surface 122. The clamping surface 122 is located on the back of the second wedge surface 121. The second wedge surface 121 and the first wedge surface 111 abut against each other. The sliding wedge block 12 is driven to slide relative to the fixed wedge block 11 by the locking mechanism 13, so that the sliding wedge block 12 moves and is positioned along the height; the locking mechanism 13 includes a locking bolt 131 and an anti-loosening component 132. The sliding wedge block 12 is provided with an elongated hole 123 arranged along the height direction. The locking bolt 131 passes through the elongated hole 123 and is connected to the anti-loosening component 132. The sliding wedge block 12 is pulled to slide by the locking bolt 131, and the locking bolt 131 is arranged parallel to the clamping surface 122.

[0032] Specifically, the fixed wedge 11 is generally installed on the side wall of the screening machine, and the sliding wedge 12 is installed below the fixed wedge 11 and located on the inner side of the screening machine, so that the first wedge surface 111 and the second wedge surface 121 are abutted, and the filter screen plate 3 is pressed below the pressing surface 122. One end of the locking bolt 131 passes through the side wall of the screening machine and is connected to the anti-loosening component 132. The anti-loosening component 132 abuts against the outer wall of the screening machine. By driving the locking bolt 131 to move, the sliding wedge 12 is driven to move along the first wedge surface 111, so that the sliding wedge 12 is close to the screening machine. side wall, and the pressing surface 122 is close to the filter screen plate 3, so as to press the filter screen plate 3. The sliding wedge 12 moves along the first wedge surface 111 during the sliding process. Therefore, the sliding wedge 12 has a horizontal sub-movement along the direction of the locking bolt 131 during the movement, and a vertical sub-movement along the direction close to the filter screen plate 3. Therefore, the sliding wedge 12 moves in the vertical direction relative to the locking bolt 131, and the long strip hole 123 is used to solve the obstruction of the locking bolt 131 to the sliding wedge 12 when the sliding wedge 12 moves in the vertical direction. After the sliding wedge 12 presses the filter screen plate 3, the locking bolt 131 is locked by the anti-loosening assembly 132 to prevent the locking bolt 131 from moving back. At this time, the locking bolt 131 is parallel to the filter screen plate 3. During the vibration operation of the filter screen plate 3, the vibration direction of the filter screen plate 3 is perpendicular to the direction of the locking screw. Therefore, the force applied to the locking screw changes little and no large alternating force is generated. Therefore, after the filter screen plate 3 is pressed by this screen plate pressing device, it is not easy to loosen, which effectively ensures the stability of the filter screen plate 3 during the normal operation of the screening machine, so that the screening machine can work normally. When the screen plate needs to be disassembled after being worn or damaged, it is only necessary to remove the anti-loosening assembly 132, and slide the locking bolt 131 and the sliding wedge 12 upward along the first wedge surface 111, so that the pressing surface 122 moves in the direction away from the filter screen plate 3, so that the filter screen plate 3 can be easily taken out and replaced with a new filter screen plate 3. The problem that the original design is easy to loosen after being pressed and is inconvenient to disassemble and assemble is solved or at least partially solved.

[0033] Furthermore, the anti-loosening assembly 132 includes a first nut 1321, a second nut 1322 and an anti-loosening sleeve 1323. The first nut 1321 and the second nut 1322 are both threadedly connected to the locking bolt 131, and the second nut 1322 is located on the side of the first nut 1321 away from the sliding wedge 12. The anti-loosening sleeve 1323 is located between the first nut 1321 and the second nut 1322, and the anti-loosening sleeve 1323 is sleeved on the outside of the first nut 1321. A plum blossom pattern is provided in the anti-loosening sleeve 1323. When the anti-loosening sleeve 1323 is sleeved on the first nut 1321, the plum blossom pattern engages with the six edges of the nut to keep the first nut 1321 and the anti-loosening sleeve 1323 relatively prohibited. The anti-loosening sleeve 1323 is inserted into the locking bolt 131, and a block 1324 is provided on the anti-loosening sleeve 1323. The locking bolt 131 is provided with a long groove 1311 arranged along the length direction of the locking bolt 131, and the block 1324 is slidably arranged in the long groove 1311. The cooperation between the long groove 1311 and the block 1324 prevents the anti-loosening sleeve 1323 from rotating, thereby further preventing the first nut 1321 from rotating. The second nut 1322 is used to abut against the anti-loosening sleeve 1323 to prevent the anti-loosening sleeve 1323 from moving back and separating from the first nut 1321. In other embodiments, the long groove 1311 can also be a flat shape, and the block 1324 can also be a protrusion extending inwardly, and the protrusion cooperates with the flat shape to prevent the anti-loosening sleeve 1323 from rotating relative to the locking bolt 131. The long groove 1311 may also be a spline groove, and the clamping block 1324 may also be a spline. The spline cooperates with the spline groove to prevent relative rotation between the anti-loosening block and the locking screw.

[0034] Furthermore, an extension block 124 is provided on the sliding wedge block 12, and the extension block 124 is fixedly connected to the side of the sliding wedge block 12, and the bottom surface of the extension block 124 is flush with the pressing surface 122 of the sliding wedge block 12. The extension block 124 increases the contact area with the filter screen plate 3, so that the sliding wedge block 12 and the extension block 124 can press the filter screen plate 3 more reliably.

[0035] Furthermore, a reinforcing rib 112 is provided on the fixed wedge 11, and the reinforcing rib 112 is located on a side of the fixed wedge 11 away from the first wedge surface 111, and a part of the reinforcing rib 112 is fixed on the inner wall of the screening machine. The provision of the reinforcing rib 112 enhances the stability of the fixed wedge 11 and improves the anti-deformation capability of the fixed wedge 11.

[0036] The working principle of the present embodiment is as follows: the fixed wedge block 11 is fixedly connected to the inner side wall of the screening machine, the sliding wedge block 12 is slidably connected below the fixed wedge block 11, and the first wedge surface 111 and the second wedge surface 121 are abutted against each other, the locking bolt 131 passes through the long strip hole 123 and the side wall of the screening machine, and the first nut 1321 is screwed to drive the locking screw and the sliding wedge block 12 to move, so that the pressing surface 122 is pressed against the filter screen plate 3, and the filter screen plate 3 is pressed. The first nut 1321 is screwed to the filter screen plate 3, and the first nut 1321 is screwed to the filter screen plate 3. After the nut 1321 is screwed, the anti-loosening sleeve 1323 is put on the screw rod, and the anti-loosening sleeve 1323 is put on the outside of the first nut 1321, so that the plum blossom pattern on the anti-loosening sleeve 1323 is meshed with the edge of the first nut 1321, which has a limiting effect on the first nut 1321 and prevents the first nut 1321 from rotating in the opposite direction and loosening. Then the second nut 1322 is installed, so that the second nut 1322 is pressed against the anti-loosening sleeve 1323 to prevent the anti-loosening sleeve 1323 from moving back and causing the first nut 1321 to loosen. The filter screen plate 3 is compressed by the device to prevent the filter screen plate 3 from loosening due to vibration during operation.

[0037] Embodiment 2:

[0038] The difference between this embodiment and the first embodiment is that, in this embodiment, the anti-loosening assembly 132 includes a first nut 1321 and a second nut 1322, both of which are threadedly connected to the locking bolt 131, and the second nut 1322 is located on the side of the first nut 1321 away from the sliding wedge 12. The sliding wedge 12 is driven to move along the first wedge surface 111 by screwing the first nut 1321, and the filter screen plate 3 is pressed by the pressing surface 122 on the sliding wedge 12. After the screen plate is pressed, the second nut 1322 is tightened, and the second nut 1322 is tightened with the first nut 1321 to prevent the first nut 1321 from loosening, thereby preventing the locking screw and the sliding wedge 12 from loosening.

[0039] Furthermore, the anti-loosening assembly 132 further includes an anti-loosening pin 1325. A through hole is provided on the locking bolt 131 along the radial direction of the locking bolt 131. The through hole is located on the side of the second nut 1322 away from the sliding wedge 12, and the anti-loosening pin 1325 is inserted into the through hole. The anti-loosening pin 1325 plays a further anti-loosening role. When the first nut 1321 and the second nut 1322 are loosened, they will move in the direction away from the sliding wedge 12 and approach the anti-loosening pin 1325 until they abut against the anti-loosening pin 1325. Because the anti-loosening pin 1325 is radially penetrated along the locking nut, the anti-loosening pin 1325 hinders the first nut 1321 or the second nut 1322 from continuing to move, thereby preventing the first nut 1321 and the second nut 1322 from continuing to loosen.

[0040] The remaining details are basically the same as those in Example 1 and will not be described again.

[0041] Embodiment 3:

[0042] The present embodiment provides a screening machine, including a frame 2, a filter screen plate 3, a vibration generating device 4 and the screen plate pressing device 1 in embodiment 1, the vibration generating device 4 is installed on the upper part of the frame 2, the filter screen plate 3 is arranged on the frame 2 and is located at the bottom of the frame 2, the screen plate pressing device 1 is arranged on the inner side wall of the bottom of the frame 2, the fixed wedge block 11 of the screen plate pressing device 1 is fixedly arranged on the frame 2, the sliding wedge block 12 is between the filter screen plate 3 and the fixed wedge block 11, and the sliding wedge block 12 is arranged on the inner side wall of the bottom of the frame 2. The second wedge surface 121 and the first wedge surface 111 are pressed against each other, the pressing surface 122 of the sliding wedge block 12 is pressed against the filter screen plate 3, the anti-loosening component 132 is fixed to the side wall of the frame body 2, the threaded end of the locking bolt 131 passes through the elongated hole 123 and cooperates with the thread, the nut end of the locking bolt 131 is pressed against the hole wall of the elongated hole 123, and the locking mechanism 13 drives the sliding wedge block 12 to slide relative to the fixed wedge block 11, so that the sliding wedge block 12 moves along the height and is positioned.

[0043] Specifically, the screen plate pressing device 1 is installed on the inner side wall of the frame 2, and the screen plate is pressed against the frame 2 by the screen plate pressing device 1 to prevent the screen plate from loosening during operation and affecting the screening effect. The vibration generating device 4 is a vibration motor, which is detachably mounted on the frame 2 by bolts. When the vibration motor is working, it drives the frame 2 and the screen plate to vibrate, thereby achieving screening.

[0044] Furthermore, a reinforcing guard plate 21 is provided on the side wall of the frame 2, and the reinforcing guard plate 21 is fixed on the side wall of the frame 2 by welding. The reinforcing guard plate 21 can be welded on the inner wall of the frame 2 or on the outer wall of the frame 2. The end of the locking bolt 131 away from the sliding wedge 12 passes through the side wall of the frame 2 and is connected to the anti-loosening component 132. The anti-loosening component 132 abuts against the reinforcing guard plate 21, and the reinforcing guard plate 21 is arranged in a one-to-one correspondence with the screen plate clamping device 1. The reinforcing plate is used to increase the rigidity of the connection between the frame 2 and the screen plate clamping device 1, and the anti-deformation ability of the frame 2 is improved during the tightening process of the first nut 1321, so as to prevent the frame 2 from being greatly deformed.

[0045] Furthermore, a limit block 22 is provided on the frame 2, and the limit block 22 is located at the end of the filter screen plate 3 and abuts against the end of the filter screen plate 3. The limit block 22 limits the position of the filter screen plate 3, which, on the one hand, prevents the filter screen plate 3 from failing to work normally due to movement, and, on the other hand, facilitates the positioning of the filter screen plate 3 during the installation of the filter screen plate 3, which is conducive to the positioning and installation of the filter screen plate 3.

[0046] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A screen plate pressing device, characterized in that: It comprises a fixed wedge (11), a sliding wedge (12) and a locking mechanism (13). The sliding wedge block (12) is slidably arranged relative to the fixed wedge block (11), the fixed wedge block (11) has a first wedge surface (111), the sliding wedge block (12) has a second wedge surface (121) and a pressing surface (122), the pressing surface (122) is located on the back of the second wedge surface (121), the second wedge surface (121) and the first wedge surface (111) are mutually abutted, the locking mechanism (13) drives the sliding wedge block (12) to slide relative to the fixed wedge block (11), thereby making the sliding wedge block (12) move along the height and position, The locking mechanism (13) comprises a locking bolt (131) and an anti-loosening assembly (132); the sliding wedge block (12) is provided with an elongated hole (123) arranged along the height direction; the locking bolt (131) passes through the elongated hole (123) and is connected to the anti-loosening assembly (132); the sliding wedge block (12) is pulled to slide by the locking bolt (131).

2. A screen plate pressing device according to claim 1, characterized in that: The anti-loosening assembly (132) comprises a first nut (1321), a second nut (1322) and an anti-loosening sleeve (1323), wherein the first nut (1321) and the second nut (1322) are both threadedly connected to the locking bolt (131), and the second nut (1322) is located on a side of the first nut (1321) away from the sliding wedge (12). The anti-loosening sleeve (1323) is located between the first nut (1321) and the second nut (1322), and the anti-loosening sleeve (1323) is sleeved on the outside of the first nut (1321). The anti-loosening sleeve (1323) is inserted into the locking bolt (131), and a clamping block (1324) is provided on the anti-loosening sleeve (1323). The locking bolt (131) is provided with a long groove (1311) arranged along the length direction of the locking bolt (131), and the clamping block (1324) is slidably arranged in the long groove (1311).

3. A screen plate pressing device according to claim 2, characterized in that: The anti-loosening sleeve (1323) is provided with a plum blossom pattern for clamping the first nut (1321).

4. A screen plate pressing device according to claim 1, characterized in that: The anti-loosening assembly (132) comprises a first nut (1321) and a second nut (1322), wherein the first nut (1321) and the second nut (1322) are both threadedly connected to the locking bolt (131), and the second nut (1322) is located on a side of the first nut (1321) away from the sliding wedge (12).

5. A screen plate pressing device according to claim 4, characterized in that: The anti-loosening assembly (132) also includes an anti-loosening pin (1325), and a through hole is provided on the locking bolt (131) along the radial direction of the locking bolt (131), and the through hole is located on the side of the second nut (1322) away from the sliding wedge block (12), and the anti-loosening pin (1325) is inserted into the through hole.

6. A screen plate pressing device according to claim 1, characterized in that: The sliding wedge block (12) is provided with an extension block (124), the extension block (124) is fixedly connected to the side of the sliding wedge block (12), and the bottom surface of the extension block (124) is flush with the pressing surface (122) of the sliding wedge block (12).

7. A screen plate pressing device according to claim 1, characterized in that: The fixed wedge block (11) is provided with a reinforcing rib (112), and the reinforcing rib (112) is located on a side of the fixed wedge block (11) away from the first wedge surface (111).

8. A screening machine, characterized in that: The invention comprises a frame (2), a filter screen plate (3), a vibration generating device (4) and a screen plate pressing device (1) according to any one of claims 1 to 7, wherein the vibration generating device (4) is installed on the upper part of the frame (2). The filter screen plate (3) is arranged on the frame (2) and is located at the bottom of the frame (2); the screen plate pressing device (1) is arranged at the bottom of the frame (2); The fixed wedge block (11) of the screen plate pressing device (1) is fixedly arranged on the frame (2), the sliding wedge block (12) is located between the filter screen plate (3) and the fixed wedge block (11), the second wedge surface (121) of the sliding wedge block (12) and the first wedge surface (111) are mutually abutted, and the pressing surface (122) of the sliding wedge block (12) is pressed against the filter screen plate (3), The anti-loosening component (132) is fixed on the side wall surface of the frame body (2), the threaded end of the locking bolt (131) passes through the long strip hole (123) and cooperates with the thread, and the nut end of the locking bolt (131) abuts against the hole wall surface of the long strip hole (123). The locking mechanism (13) drives the sliding wedge (12) to slide relative to the fixed wedge (11), thereby allowing the sliding wedge (12) to move along the height and be positioned.

9. A screening machine according to claim 8, characterized in that: A reinforcing guard plate (21) is provided on the side wall of the frame (2), and one end of the locking bolt (131) away from the sliding wedge block (12) passes through the side wall of the frame (2) and is connected to the anti-loosening component (132). The anti-loosening component (132) abuts against the reinforcing guard plate (21), and the reinforcing guard plate (21) and the screen plate clamping device (1) are arranged one-to-one.

10. A screening machine according to claim 8, characterized in that: A limit block (22) is provided on the frame (2), and the limit block (22) is located at the end of the filter screen plate (3) and abuts against the end of the filter screen plate (3).

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