A multi-stage sand washing and screening device

Abstract

A multi-stage sand and gravel washing and screening device includes a sand and gravel washing machine and a screening tank. Several screening structures are arranged within the screening tank. Each screening structure includes a screen plate assembly and a conveying assembly. A first chute and an opening are provided on the screening tank. A switch door is installed within the opening. A connecting plate is also provided within the screening tank. A first slider is fixed to the connecting plate. A driving device is provided between the sand and gravel washing machine and the screening tank. The driving device includes a mounting box, a second slider, and a swing assembly. The mounting box has a second chute. The swing assembly includes a swing rod, a first lever, a second lever, a turntable, and a motor. The swing rod has a first strip-shaped through groove and a second strip-shaped through groove. Each screen plate assembly in this invention can be individually disassembled and assembled.

Description

Technical Field

[0001] This utility model relates to the field of sand washing machine technology, specifically a multi-stage sand and gravel washing and screening equipment. Background Technology

[0002] Chinese Patent CN218742468U discloses a multi-stage sand and gravel washing and screening machine. The multi-stage sand and gravel washing and screening machine includes a sand and gravel washing and screening machine with a screening trough below the discharge end. Support plates are movably connected to both sides of the inner wall of the screening trough. A fixed block is located between each of the two support plates. Several equally spaced, vertically distributed U-shaped frames are fixedly connected between the two fixed blocks. Each U-shaped frame contains a screen plate with a different aperture. A conveying component is located below each screen plate. A machine housing is fixedly connected to one outer wall of the screening trough. A reciprocating component is located inside the machine housing, penetrating the inner wall of the machine housing and the inner wall of the screening trough, and extending into the trough. The reciprocating component is fixedly connected to the support plates. This utility model has the function of grading and screening washed sand and gravel, eliminating the need to purchase new screening equipment and saving costs.

[0003] After prolonged use, the screen plates need to be disassembled for cleaning or replacement. However, this invention only allows disassembling the screen plates sequentially from top to bottom. This means that even if only the lower screen plates need to be removed for cleaning or replacement, the upper screen plates must be removed first. In other words, this invention has the problem of not being able to disassemble and install the lower screen plates individually. Those skilled in the art, considering the structural design of this invention, can conceive of creating openings in the sidewall of the screening tank to allow for individual disassembly and installation of each screen plate. However, in this invention, the openings can only be created on the sidewall of the screening tank closest to the sand and gravel washing machine (i.e., in this invention...). Figure 3 The screen plate is located on the left side wall of the screening tank. To disassemble or install the screen plate through this opening, workers would need to crawl into the narrow space between the sand and gravel washing machine and the screening tank, and would be positioned below the guide plate. Disassembling or installing the screen plate at this location is not only inconvenient but also poses a safety hazard.

[0004] Therefore, this utility model proposes a new technical solution to solve the problem that the sieve plate located below cannot be disassembled and assembled separately. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a multi-stage sand and gravel washing and screening equipment, which aims to achieve the technical effect that each screen plate component can be disassembled and assembled individually.

[0006] A multi-stage sand and gravel washing and screening device includes a sand and gravel washing machine and a screening trough located below the discharge end of the sand and gravel washing machine. The screening trough contains several screening structures arranged sequentially from top to bottom. Each screening structure includes an inclined screen plate assembly and a conveying assembly located below the screen plate assembly. A first sliding groove communicating with the interior of the screening trough is formed on one side wall near the sand and gravel washing machine. An opening is formed on the other side wall of the screening trough, and a switch door is installed in the opening. A connecting plate detachably connectable to the screen plate assemblies is also provided in the screening trough. A first slider is fixed on the connecting plate. The first slider passes through the first sliding groove and slides along the first sliding groove. A driving device for reciprocating motion of the first slider along the first sliding groove is provided between the sand and gravel washing machine and the screening trough. The driving device includes a mounting box, a second slider, and a swing assembly. The mounting box is located between the sand and gravel washing machine and the screening trough. The outer side wall of the mounting box near the screening trough... The upper part has a second groove that communicates with its interior and corresponds to the first groove. The swing assembly includes a swing rod, a turntable, and a motor. The bottom end of the swing rod is rotatably connected to the inner wall of the mounting box via a pin. The middle part of the swing rod has a first strip-shaped through groove extending in the same direction as the swing rod. The top part of the swing rod has a second strip-shaped through groove extending in the same direction as the swing rod. A rotating shaft is fixedly connected to the center of one side of the turntable. The other end of the rotating shaft is rotatably connected to the inner wall of the mounting box via a bearing. A first lever is fixed at the edge of the other side of the turntable for inserting into and sliding along the first strip-shaped through groove. The motor is mounted on the outer wall of the mounting box to drive the rotating shaft to rotate. One end of the second slider is located inside the mounting box and is fixed with a second lever for inserting into and sliding along the second strip-shaped through groove. The other end of the second slider passes through the second groove and exits the mounting box and is fixedly connected to the first slider. The second slider slides along the second groove.

[0007] By adopting the above technical solution, during use, the motor is started. The motor drives the turntable to rotate. The turntable drives the first lever to rotate. The first lever drives the swing rod to swing back and forth, and the first lever moves back and forth along the first strip-shaped through groove. The swing rod drives the second slider to move back and forth along the second slide groove via the second lever, and the second lever moves back and forth in the second strip-shaped through groove. The second slider drives the first slider to move back and forth along the first slide groove. The first slider drives the connecting plate to move back and forth. The connecting plate drives several screen plate assemblies to move back and forth simultaneously, so that all several screen plate assemblies form vibrating screening. After the sand and gravel are washed in the sand and gravel washing machine, they are fed onto the uppermost screen plate assembly in the screening tank. Sand and gravel particles larger than the uppermost screen plate assembly will remain on it and roll off onto the uppermost conveyor assembly for transport. Smaller particles will fall through the holes in the uppermost screen plate assembly onto the next screen plate assembly. Similarly, the sand and gravel screened by the second screen plate assembly will fall onto the third screen plate assembly, and so on, performing multiple grading, screening, and transport processes. When it is necessary to disassemble each screen plate assembly for cleaning or replacement, the switch door can be opened, allowing for individual disassembly and assembly of each screen plate assembly. Each screen plate assembly in this invention can be disassembled and assembled individually.

[0008] A further feature of this invention is that a guide rod extending in the same direction as the second slide groove is fixed inside the mounting box, and the second slider is slidably sleeved on the outside of the guide rod.

[0009] By adopting the above technical solution, the second slider slides along the guide rod, which improves the stability of the second slider during sliding.

[0010] Further features of this invention: The sieve plate assembly includes an annular frame and a sieve plate. Magnetic blocks, which are permanent magnets, are fixedly connected to each corner of the top of the annular frame. The sieve plate is placed on the top of the annular frame and is magnetically connected to the annular frame. An mounting plate is fixed on the outer wall of the annular frame near the connecting plate. A trapezoidal insert is fixed on the mounting plate near the connecting plate. A trapezoidal slot is provided on the connecting plate for the trapezoidal insert to slide into. A fixing structure is provided between the connecting plate and the trapezoidal insert for fixing the trapezoidal insert in the trapezoidal slot.

[0011] By adopting the above technical solution, when it is necessary to remove the screen plate assembly from the connecting plate, first loosen the fixing structure, and then pull the trapezoidal insert out of the trapezoidal slot to remove the screen plate assembly. When the screening plate is damaged and needs to be replaced, remove the screening plate from the annular frame and replace the screening plate separately.

[0012] Further features of this invention: The fixing structure includes a fixing block and a connecting block. The connecting block is fixed to one end of the trapezoidal insert that protrudes from the trapezoidal slot. A connecting hole is provided on the connecting block. The fixing block is fixed to the connecting plate and corresponds to the connecting block. A cavity is provided inside the fixing block. A sliding plate is slidably connected inside the cavity. A connecting rod is fixed to one side of the sliding plate. The other end of the connecting rod protrudes from the fixing block in a slidable connection and is inserted into the connecting hole in a mating connection. A pull rod is connected to the other side of the sliding plate. The other end of the pull rod protrudes from the fixing block in a slidable connection and is fixed with a pull block. A spring is sleeved on the outside of the pull rod and fixed between the sliding plate and the cavity wall.

[0013] By employing the above technical solution, when it is necessary to loosen the fixed structure, the pull block is used to pull the pull rod. The pull rod causes the sliding plate to move along the cavity away from the connecting block. The spring is compressed, generating a rebound force. The sliding plate causes the connecting rod to move into the cavity, thereby pulling the end of the connecting rod that was originally inserted into the connecting hole out of the connecting hole, thus loosening the fixed structure. Similarly, by releasing the pull block, under the action of the spring's rebound force, the connecting rod can be reset and re-inserted into the connecting hole, thereby locking the fixed structure.

[0014] A further feature of this invention is that a sleeve is fixed to one end of the fixed block away from the connecting block and fitted onto the outside of the pull rod. A strip-shaped groove is provided on the inner side wall of the sleeve. A protrusion is fixed on the outer side wall of the pull rod for inserting into the strip-shaped groove and sliding along the groove. The pull rod is rotatably connected to the sliding plate.

[0015] By adopting the above technical solution, when the pull rod is pulled, it slides along the sleeve, causing the protrusion to slide along the strip groove. When one end of the connecting rod is completely pulled out of the connecting hole, the protrusion slides out of the strip groove. Then, the pull block is rotated, causing the pull rod to rotate on the sliding plate, thereby disengaging the protrusion from the strip groove. At this point, releasing the pull rod causes the protrusion to lock onto the outer wall of the sleeve, automatically limiting the return of the pull rod, eliminating the need for the operator to continuously pull the pull rod by hand.

[0016] A further feature of this invention is that a collection box located directly below the sieve plate assembly is also provided inside the screening trough.

[0017] By adopting the above technical solution, a small amount of fine material can pass through the bottom screening plate, and the collection box can collect and centrally process these materials.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] A multi-stage sand and gravel washing and screening device is disclosed, which can perform multiple grading, screening, and transportation of sand and gravel. When it is necessary to disassemble each screen plate assembly for cleaning or replacement, the switch door is opened, and each screen plate assembly can be disassembled and assembled individually through the opening. Each screen plate assembly in this invention can be disassembled and assembled individually. Attached Figure Description

[0020] Figure 1 This is a sectional view from the front view of a multi-stage sand and gravel washing and screening device according to the present invention.

[0021] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 for Figure 1 Enlarged view at point B

[0023] Figure 4 This is a side view of the swing rod, turntable, first lever, and second lever of a multi-stage sand and gravel washing and screening device according to this utility model;

[0024] Figure 5 This is a top view of the screening tank and drive device of a multi-stage sand and gravel washing and screening equipment according to this utility model;

[0025] Figure 6 This is a top-view sectional view of the fixed block and connecting block of a multi-stage sand and gravel washing and screening device according to this utility model.

[0026] Reference numerals: 1. Sand and gravel washing machine; 2. Drive unit; 3. Screening trough; 4. First chute; 5. Opening and closing door; 6. Conveying assembly; 7. Annular frame; 8. Screening plate; 9. Mounting plate; 10. Trapezoidal insert; 11. Connecting block; 12. Connecting hole; 13. Baffle; 14. Trapezoidal slot; 15. Fixing block; 16. Cavity; 17. Sliding plate; 18. Connecting rod; 19. Pull rod; 20. Pull block; 21. Spring; 22. Sleeve; 23. Strip groove; 24. Protrusion; 25. First slider; 26. Mounting box; 27. Second slider; 28. Second groove; 29. ​​Swing rod; 30. Turntable; 31. Motor; 32. First strip through groove; 33. Second strip through groove; 34. Rotating shaft; 35. First lever; 36. Second lever; 37. Guide rod; 38. Collection box; 39. Guide plate. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] A multi-stage sand and gravel washing and screening equipment, such as Figures 1-6 As shown, it includes a sand and gravel washing and screening machine 1, a drive unit 2, and a screening tank 3 arranged from left to right.

[0029] The discharge end of the sand and gravel washing machine 1 is fixedly connected to a guide plate 39 that is inclined from left to right. This embodiment is a technical improvement to address the problem in Chinese Patent No. CN218742468U, which describes a multi-stage sand and gravel washing machine 1, where the lower screen plate cannot be disassembled and reassembled independently. Therefore, only the screening tank 3 and the drive device 2 are specifically described. The sand and gravel washing machine 1 itself is not specifically described. For the specific structure of the sand and gravel washing machine 1, please refer to the relevant description in Chinese Patent No. CN218742468U.

[0030] The screening trough 3 is located below the right end of the guide plate 39. A first sliding groove 4 communicating with the interior of the screening trough 3 is formed on the left side wall of the screening trough 3. An opening is formed on the front side wall of the screening trough 3. A switch door 5 is installed in the opening.

[0031] The screening tank 3 is equipped with a connecting plate and several screening structures arranged from top to bottom.

[0032] The screening structure includes a screen plate assembly that is inclined on the left and lower on the right, and a conveying assembly 6 located below the right end of the screen plate assembly.

[0033] The sieve plate assembly includes an annular frame 7 and a screening plate 8. Magnetic blocks are fixedly connected to each corner of the top of the annular frame 7. The magnetic blocks are permanent magnets. The sieve plate is placed on the top of the annular frame 7 and is magnetically connected to the annular frame 7. A mounting plate 9 is fixed to the outer wall on the left side of the annular frame 7. A trapezoidal insert 10 is fixed to the side of the mounting plate 9 near the connecting plate. A connecting block 11 is fixed to the front end of the trapezoidal insert 10, and a connecting hole 12 is opened on the left side of the connecting block 11. Baffles 13 are fixed to the outer walls on both the front and rear sides of the annular frame 7. The baffles 13 are designed to prevent sand and gravel from falling directly from the screening plate 8 without being screened through the sieve holes due to the reciprocating motion of the sieve plate assembly.

[0034] It is worth noting that the aperture of the sieve holes in each sieve plate 8 decreases sequentially from top to bottom.

[0035] The conveying assembly 6 includes a conveyor belt, a drive motor 31, and several transmission rollers. Its specific structure can be found in the description of Chinese Patent No. CN218742468U, "A Multi-stage Sand and Gravel Washing Machine 1," and will not be specifically described in this embodiment. It is worth noting that in this embodiment, the width of the conveyor belt's lateral extension is greater than the width of the screen plate assembly and its movable distance, ensuring that the screen plate assembly always corresponds to the conveyor belt when moving back and forth.

[0036] A trapezoidal slot 14 is provided on the right side wall of the connecting plate for the trapezoidal insert 10 to slide into. A fixing block 15 is fixed to the front end of the connecting plate. When the trapezoidal insert 10 is fully inserted into the trapezoidal slot 14, the connecting block 11 is located outside the trapezoidal slot 14 and corresponds to the fixing block 15. A cavity 16 is provided inside the fixing block 15. A sliding plate 17 is slidably connected inside the cavity 16. A connecting rod 18 is fixed to one side of the sliding plate 17. The other end of the connecting rod 18 slides out of the fixing block 15 and is inserted into the connecting hole 12. A pull rod 19 is rotatably connected to the other side of the sliding plate 17. The other end of the pull rod 19 slides out of the fixing block 15 and is fixed with a pull block 20. A spring 21 is sleeved on the outside of the pull rod 19 and fixed between the sliding plate 17 and the cavity wall of the cavity 16. A sleeve 22 is fixed to the left end of the fixing block 15 and sleeved on the outside of the pull rod 19. A strip groove 23 is formed on the inner wall of the sleeve 22. A protrusion 24 is fixed on the outer wall of the pull rod 19 for inserting into the strip groove 23 and sliding along the strip groove 23. A first slider 25 is fixed on the left side of the connecting plate. The first slider 25 passes through the first groove 4 and exits the screening groove 3, and slides along the first groove 4.

[0037] The drive unit 2 is used to drive the first slider 25 to reciprocate along the first slide groove 4. The drive unit 2 includes a mounting box 26, a second slider 27, and a swing assembly.

[0038] A second slide groove 28, which communicates with the interior of the mounting box 26 and corresponds to the first slide groove 4, is provided on the right outer wall of the mounting box 26.

[0039] The swing assembly includes a swing rod 29, a turntable 30, and a motor 31. The bottom end of the swing rod 29 is rotatably connected to the inner wall of the mounting box 26 via a pin. A first strip-shaped through groove 32 extending in the same direction is formed in the middle part of the swing rod 29. A second strip-shaped through groove 33 extending in the same direction is formed in the top part of the swing rod 29. A rotating shaft 34 is fixedly connected to the center of the left side of the turntable 30. The left end of the rotating shaft 34 is rotatably connected to the inner wall of the mounting box 26 via a bearing. A first lever 35 for inserting into and sliding along the first strip-shaped through groove 32 is fixed at the right edge of the turntable 30. The motor 31 is mounted on the outer wall of the mounting box 26 to drive the rotating shaft 34 to rotate. A second slider 27 slides along a second slide groove 28. The left end of the second slider 27 is located inside the mounting box 26 and is fixed with a second lever 36 for inserting into and sliding along the second strip-shaped through groove 33. The right end of the second slider 27 passes through the second groove 28 and exits the mounting box 26, where it is fixedly connected to the first slider 25. In this embodiment, both the first lever 35 and the second lever 36 are cylindrical in shape.

[0040] Additionally, a guide rod 37 extending in the same direction as the second slide groove 28 is fixed inside the mounting box 26, and the second slider 27 is slidably sleeved on the outside of the guide rod 37. The second slider 27 slides along the guide rod 37, which improves the stability of the second slider 27 during sliding.

[0041] The screening tank 3 is also equipped with a collection box 38 located directly below the screen plate assembly. Small amounts of fine materials can pass through the bottom screening plate 8, and the collection box 38 can collect and centrally process these materials.

[0042] Working principle:

[0043] In use, motor 31 is started. Motor 31 drives turntable 30 to rotate. Turntable 30 drives first lever 35 to rotate. First lever 35 drives swing rod 29 to swing back and forth, and first lever 35 moves back and forth along first strip-shaped through groove 32. Swing rod 29 drives second slider 27 to move back and forth along second slide groove 28 and guide rod 37 via second lever 36, and second lever 36 moves back and forth in second strip-shaped through groove 33. Second slider 27 drives first slider 25 to move back and forth along first slide groove 4. First slider 25 drives connecting plate to move back and forth. Connecting plate drives several screen plate assemblies to move back and forth simultaneously, so that several screen plate assemblies all form vibrating screening. After the sand and gravel are washed in the sand and gravel washing machine 1, they are fed into the uppermost screening plate 8 in the screening tank 3. Sand and gravel with a particle size larger than the screen holes of the uppermost screening plate 8 will remain on it and roll down to the uppermost conveying component 6 for transport. Smaller particles will pass through the screen holes on the uppermost screening plate 8 and fall onto the next screening plate 8. Similarly, the sand and gravel after being screened by the second screening plate 8 will fall onto the third screening plate 8, and so on, so that the sand and gravel are graded, screened and transported multiple times.

[0044] When it is necessary to disassemble each screen plate assembly for cleaning or replacement, open the switch door 5, and each screen plate assembly can be disassembled individually through the opening. During disassembly, first loosen the fixing structure, then pull the trapezoidal insert 10 out of the trapezoidal slot 14 to remove the screen plate assembly. When the screening plate 8 is damaged and needs replacement, remove the screening plate 8 from the annular frame 7 and replace the screening plate 8 individually.

[0045] When it is necessary to loosen the fixing structure, pull the lever 19 by pulling the lever 20. The lever 19 causes the sliding plate 17 to move along the cavity 16 away from the connecting block 11. The spring 21 is compressed, generating a rebound force. The sliding plate 17 causes the connecting rod 18 to move into the cavity 16, thereby pulling out the end of the connecting rod 18 that was originally inserted into the connecting hole 12, thus loosening the fixing structure. Similarly, by releasing the lever 20, the connecting rod 18 can be reset and re-inserted into the connecting hole 12 under the rebound force of the spring 21, thereby locking the fixing structure.

[0046] Furthermore, when the pull rod 19 is pulled, it slides along the sleeve 22, causing the protrusion 24 to slide along the strip groove 23. When one end of the connecting rod 18 is completely pulled out of the connecting hole 12, the protrusion 24 slides out of the strip groove 23. Then, the pull block 20 is rotated, causing the pull rod 19 to rotate on the sliding plate 17, thereby dislocating the protrusion 24 from the strip groove 23. At this point, releasing the pull rod 19 causes the protrusion 24 to engage on the outer wall of the sleeve 22, automatically limiting the return of the pull rod 19 without requiring the operator to continuously pull the pull rod 19 by hand.

[0047] Each sieve plate component in this invention can be disassembled and assembled individually, and the disassembly and assembly process is simple, convenient, and highly safe.

[0048] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0050] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0051] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-stage sand and gravel washing and screening equipment, comprising a sand and gravel washing and screening machine (1) and a screening trough (3) disposed below the discharge end of the sand and gravel washing and screening machine (1), wherein the screening trough (3) is provided with a plurality of screening structures arranged sequentially from top to bottom, the screening structure comprising an inclined screen plate assembly and a conveying assembly (6) disposed below the screen plate assembly, characterized in that: On one side of the screening tank (3) near the sand and gravel washing machine (1), a first sliding groove (4) communicating with its interior is provided. On the other side of the screening tank (3), an opening is provided, and a switch door (5) is installed in the opening. The screening tank (3) is also provided with a connecting plate that can be detachably connected to several screen plate assemblies. A first slider (25) is fixed on the connecting plate. The first slider (25) passes through the first sliding groove (4) and exits the screening tank (3), and slides along the first sliding groove (4). A space is provided between the sand and gravel washing machine (1) and the screening tank (3) for... A drive device (2) that drives the first slider (25) to reciprocate along the first slide groove (4) includes a mounting box (26), a second slider (27), and a swing assembly. The mounting box (26) is located between the sand and gravel washing machine (1) and the screening tank (3). A second slide groove (28) corresponding to the first slide groove (4) is opened on the outer side wall of the mounting box (26) near the screening tank (3). The swing assembly includes a swing rod (29), a turntable (30), and a motor (31). The bottom end of the swing rod (29) is connected to the mounting box (26). The inner wall of the box (26) is rotatably connected by a pin. The middle part of the swing rod (29) is provided with a first strip-shaped through groove (32) extending in the same direction as the swing rod (29). The top part of the swing rod (29) is provided with a second strip-shaped through groove (33) extending in the same direction as the swing rod (29). A rotating shaft (34) is fixedly connected to the center of one side of the turntable (30). The other end of the rotating shaft (34) is rotatably connected to the inner wall of the mounting box (26) by a bearing. The other edge of the turntable (30) is fixed with a groove for inserting into the first strip-shaped through groove (32) and along the first... The first lever (35) slides through the strip-shaped through groove (32). The motor (31) is mounted on the outer wall of the mounting box (26) to drive the rotating shaft (34) to rotate. One end of the second slider (27) is located inside the mounting box (26) and is fixed with a second lever (36) for inserting into the second strip-shaped through groove (33) and sliding along the second strip-shaped through groove (33). The other end of the second slider (27) passes through the mounting box (26) through the second slide groove (28) and is fixedly connected to the first slider (25). The second slider (27) slides along the second slide groove (28).

2. The multi-stage sand and gravel washing and screening equipment according to claim 1, characterized in that: The mounting box (26) is fixed with a guide rod (37) whose extension direction is consistent with the second slide groove (28), and the second slider (27) is slidably sleeved on the outside of the guide rod (37).

3. The multi-stage sand and gravel washing and screening equipment according to claim 1, characterized in that: The sieve plate assembly includes an annular frame (7) and a sieve plate (8). Magnetic blocks are fixedly connected to each corner of the top of the annular frame (7). The magnetic blocks are permanent magnets. The sieve plate is placed at the top of the annular frame (7) and is magnetically connected to the annular frame (7). An mounting plate (9) is fixed on the outer side wall of the annular frame (7) near the connecting plate. A trapezoidal insert (10) is fixed on the mounting plate (9) near the connecting plate. A trapezoidal slot (14) is provided on the connecting plate for the trapezoidal insert (10) to slide into. A fixing structure is provided between the connecting plate and the trapezoidal insert (10) for fixing the trapezoidal insert (10) in the trapezoidal slot (14).

4. The multi-stage sand and gravel washing and screening equipment according to claim 3, characterized in that: The fixing structure includes a fixing block (15) and a connecting block (11). The connecting block (11) is fixed to one end of the trapezoidal insert (10) that protrudes from the trapezoidal slot (14). The connecting block (11) has a connecting hole (12). The fixing block (15) is fixed to the connecting plate and corresponds to the connecting block (11). The fixing block (15) has a cavity (16) inside. A sliding plate (17) is slidably connected in the cavity (16). One side of the sliding plate (17) is fixed. There is a connecting rod (18), the other end of which slides through the fixing block (15) and is inserted into the connecting hole (12) in a mating connection manner. A pull rod (19) is fixed on the other side of the sliding plate (17). The other end of the pull rod (19) slides through the fixing block (15) and is fixed with a pull block (20). A spring (21) is sleeved on the outside of the pull rod (19) and fixed between the sliding plate (17) and the cavity wall of the cavity (16).

5. The multi-stage sand and gravel washing and screening equipment according to claim 4, characterized in that: A sleeve (22) is fixed on one end of the fixed block (15) away from the connecting block (11) and sleeved outside the pull rod (19). A strip groove (23) is provided on the inner side wall of the sleeve (22), and a protrusion (24) is fixed on the outer side wall of the pull rod (19) for inserting into the strip groove (23) and sliding along the strip groove (23).

6. The multi-stage sand and gravel washing and screening equipment according to claim 1, characterized in that: The screening tank (3) is also equipped with a collection box (38) located directly below the screen plate assembly.

Images