Filtering device for wastewater treatment

Abstract

The utility model discloses a filter device for wastewater treatment, which relates to the technical field of wastewater treatment and comprises a treatment box, a filter plate is connected with a collecting frame, a vertical rod is connected with a cleaning rod, a connecting block is connected with a movable rod and a connecting seat, a rotating shaft is connected with a motor, a gear is connected with a rack, and an air cylinder is connected with a connecting rod; a motor is started to drive a rotating shaft to enable a gear to move on a rack, a connecting seat drives a connecting block to enable a vertical rod to drive a cleaning rod to push impurities into a collecting frame, the cleaning rod moves to the maximum limit, the motor is closed, an air cylinder is started to enable the cleaning rod to be separated from a filter plate, the motor is started to enable the cleaning rod to move above an initial position, and the air cylinder enables the cleaning rod to move downwards to make contact with the filter plate. The problems that when a filter plate is cleaned, push-pull handles on the two sides are pushed respectively, push plates cannot move at the same time, and the operation is troublesome and the efficiency is low are solved. The problem that when push-pull handles on the two sides are pushed at the same time, operation is strenuous due to the fact that a treatment box has a certain size is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a filtering device for wastewater treatment. Background Technique

[0002] Wastewater treatment is an environmental protection and energy-saving technology that uses physical, chemical, and biological methods to purify wastewater, reduce pollution, and achieve the recycling and reuse of water resources. The treatment of wastewater from dye intermediate production involves chemical reaction processes such as nitrification, reduction, sulfonation, halogenation, amination, oxidation, acylation, and alkylation of basic organic raw materials. Wastewater pollution will be generated during the production process of dye intermediates, and a wastewater filtration device will be used for treatment.

[0003] Chinese Patent CN221014739U discloses a device for treating wastewater from dye intermediate production, including a treatment tank. A material-taking opening is provided in the middle of the left side of the treatment tank, and a box door is hinged to the middle of the left side of the treatment tank. Through the settings of the material-taking opening, box door, rotating shaft, rotating handle, driving bevel gear, connecting plate, screw rod, driven bevel gear, connecting sleeve, and support plate, it is convenient to fix and disassemble the filter plate and take out the disassembled filter plate from the treatment tank, thus greatly reducing the working intensity of operators, ensuring the efficiency of wastewater treatment, greatly reducing the time for delaying wastewater treatment due to disassembling the filter plate, and greatly enhancing the practicability of the device. Through the settings of the connecting rod, push plate, push-pull handle, and collection box, impurities can be pushed into the collection box to clean the impurities attached to the filter plate, ensure the filtering effect of the filter plate, extend the service life of the filter plate, and reduce the frequency of taking out the filter plate for cleaning.

[0004] In the above patent, when cleaning the impurities on the filter plate, when pushing the push-pull handles on both sides separately to push the impurities on the filter plate into the collection box, the push plates cannot move simultaneously, which is rather troublesome and has low efficiency; or when pushing the push-pull handles on both sides simultaneously to push the impurities on the filter plate into the collection box, due to the certain size of the treatment tank, the operation is rather laborious. Content of the Utility Model

[0005] The purpose of the utility model is to provide a filtering device for wastewater treatment to solve the problems raised in the above background technique.

[0006] To solve the above technical problems, the present utility model provides the following technical solution: A filtering device for wastewater treatment, comprising: a treatment tank, a filter plate is fixed to the inner wall of the treatment tank, a collection frame is fixed in the middle of the filter plate, a cleaning rod slides on the top surface of the filter plate, a vertical rod is fixed to the top surface of the cleaning rod, an upper end of the vertical rod is fixed with a connection block slidably connected to a movable rod, a connection seat located above the treatment tank is fixed to the top surface of the connection block, a rotating shaft is horizontally rotatably connected to the connection seat, one end of the rotating shaft is fixed with a motor fixed to the connection seat, a gear meshing with a rack is fixed to the rotating shaft, a connecting rod fixed to a cylinder is horizontally fixed to the top surface of the rack, the cylinder is fixed to a fixing frame fixed to the top surface of the treatment tank, a limiting groove for sliding a limiting rod is horizontally formed on a side wall of the connecting rod, and the limiting rod is fixed to the connection seat; discharge grooves for sliding a movable plate are formed on both left and right plates of the treatment tank, the movable plate is slidably connected to the inner wall of the collection frame, a sealing gasket is fixed to an outer wall of the movable plate, a connecting shaft is horizontally fixed to the center of the two movable plates, a push-pull rod located outside the treatment tank is fixed to a right end of the connecting shaft, and the push-pull rod is movably connected to a fixing component.

[0007] Further, the cross section of the collection frame is U-shaped, the top surface of the collection frame and the top surface of the filter plate are on the same horizontal plane, and a plurality of water filtering holes are formed on the collection frame.

[0008] Further, there are two cleaning rods, the two cleaning rods are respectively located on the front and rear sides of the collection frame, both end walls of the cleaning rod are slidably connected to the inner wall of the treatment tank, and the vertical rod is fixed to the center of the top surface of the cleaning rod.

[0009] Further, a through groove is horizontally formed at the center of the top plate of the treatment tank, the movable rod is movably connected to the through groove, a connection groove for sliding the connection block is horizontally formed on the movable rod, and the cross sections of the connection groove and the connection block are both cross-shaped.

[0010] Further, the cross section of the connection seat is U-shaped, the bottom surface of the connection seat is slidably connected to the top surface of the movable rod, both ends of the rotating shaft are respectively horizontally rotatably connected to the left and right side plates of the connection seat, the gear is located outside the connection seat, and the motors on the two connection seats are symmetrically distributed about the center.

[0011] Further, the rack is located above the gear, four limiting grooves are formed, respectively on the side walls on both sides of the front and rear ends of the connecting rod, the side wall of the connecting rod is slidably connected to the inner wall of the connection seat, and the limiting rod is fixed to the upper inner wall of the connection seat.

[0012] Further, the cross section of the fixing frame is U-shaped, the fixing frame is fixed to the center of the top surface of the treatment tank, the fixing frame is located outside the connecting rod, the inner wall of the fixing frame is slidably connected to both end walls of the connecting rod, and there are two cylinders respectively located at both ends of the upper rod of the fixing frame.

[0013] Further, guiding grooves for sliding the guiding blocks are horizontally formed in the inner walls at the upper ends of the side plates of the collecting box. The cross section of the guiding block is L-shaped, and the guiding block is fixed to the inner side wall of the movable plate on the left side.

[0014] Further, the fixing assembly includes a fixing plate which is horizontally fixed to the right wall of the processing box and is located above the discharge chute. A threaded rod is vertically connected to the fixing plate in a threaded manner. A bearing is fixed to the lower end of the threaded rod, and a limiting frame is fixed to the outer wall of the bearing. The cross section of the limiting frame is inverted U-shaped, and the inner wall of the limiting frame is in contact with the inner wall of the push-pull rod. A guiding rod which is slidably connected to the fixing plate is vertically fixed to the top surface of the limiting frame, and the cross section of the guiding rod is T-shaped.

[0015] Compared with the prior art, the beneficial effects achieved by the utility model are as follows:

[0016] 1. When cleaning the impurities on the filter plate of the utility model, the motor is started to drive the rotating shaft to rotate. The rotating shaft drives the gear to rotate and move on the rack, so that the two connecting seats move towards each other. The connecting seat drives the limiting rod to slide in the limiting groove. At the same time, the connecting seat drives the connecting block to slide in the connecting groove. The connecting block drives the vertical rod to make the cleaning rod slide on the filter plate to push the impurities on the filter plate and push them into the collecting box. When the cleaning rod is completely in contact with the top surface of the collecting box, that is, when the limiting rod moves to the maximum limit, the motor is turned off. The air cylinder is started to drive the connecting rod to move upward. When the limiting groove on the connecting rod passes through the limiting rod, the connecting seat moves upward. Through the connection between the connecting block and the connecting groove, the movable rod moves upward. The connecting block drives the vertical rod to make the cleaning rod move upward and separate from the filter plate. The motor is started to make the two cleaning rods move away from each other and return above the initial position. The movable end of the air cylinder moves downward to make the cleaning rod contact the filter plate, completing the cleaning, realizing synchronous cleaning, improving the efficiency and being labor-saving; when cleaning again, the principle is the same as above; it solves the problem that when cleaning the impurities on the filter plate, the push-pull handles on both sides are respectively pushed to make the push plate push the impurities on the filter plate into the collecting box, and the push plate cannot move simultaneously, which is rather troublesome and has low efficiency; it solves the problem that when the push-pull handles on both sides are pushed simultaneously to make the push plate push the impurities on the filter plate into the collecting box, it is rather laborious to operate due to the certain size of the processing box;

[0017] After the impurities in the collecting frame are cleaned, the push-pull rod is horizontally limited by the fixed assembly, so that the collecting frame does not need to be taken out to clean the impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a top view schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This utility model Figure 1 A schematic diagram of the enlarged structure of the middle A area;

[0021] Figure 3 This utility model Figure 1 A schematic diagram of the structure of the middle B region;

[0022] Figure 4 This is a schematic diagram of the internal structure of the processing box of the utility model;

[0023] Figure 5 This is a schematic diagram of the connection between the left movable plate and the collection frame of the utility model;

[0024] Figure 6 This is a schematic diagram of the structural connection on the cleaning rod of the utility model;

[0025] In the figure: 1, processing box; 2, fixing frame; 3, cylinder; 4, through groove; 5, movable rod; 6, connecting groove; 7, connecting rod; 8, limiting groove; 9, limiting rod; 10, connecting seat; 11, rotating shaft; 12, gear; 13, rack; 14, connecting block; 15, fixing plate; 16, threaded rod; 17, guide rod; 18, bearing; 19, push-pull rod; 20, limiting frame; 21, discharge chute; 22, gasket; 23, connecting shaft; 24, movable plate; 25, vertical rod; 26, filter plate; 27, cleaning rod; 28, collection box; 29, guide groove; 30, guide block; 31, motor. Detailed implementation manner

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] Please refer to Figures 1 - 6, the present utility model provides a technical solution: a filtering device for wastewater treatment, comprising: a treatment tank 1, wherein a filter plate 26 is fixed to the inner wall of the treatment tank 1, a collection frame 28 is fixed in the middle of the filter plate 26, the cross-section of the collection frame 28 is U-shaped, the top surface of the collection frame 28 and the top surface of the filter plate 26 are on the same horizontal plane, facilitating the collection of impurities on the filter plate 26. A number of water filtering holes are provided on the collection frame 28, enabling the liquid to pass through the water filtering holes. A cleaning rod 27 slides on the top surface of the filter plate 26, a vertical rod 25 is fixed to the top surface of the cleaning rod 27. There are two cleaning rods 27, and the two cleaning rods 27 are respectively located on the front and rear sides of the collection frame 28. The two end walls of the cleaning rod 27 are slidably connected to the inner wall of the treatment tank 1. The vertical rod 25 is fixed to the center of the top surface of the cleaning rod 27. The upper end of the vertical rod 25 is fixed with a connection block 14 that is slidably connected to the movable rod 5. A through groove 4 is horizontally opened at the center of the top plate of the treatment tank 1, and the movable rod 5 is movably connected to the through groove 4, enabling the movable rod 5 to slide upward within the through groove 4 and preventing the movable rod 5 from disengaging from the through groove 4, thus preventing the horizontal displacement of the movable rod 5 during the cleaning process. A connection groove 6 for sliding the connection block 14 is horizontally provided on the movable rod 5. The cross-sections of the connection groove 6 and the connection block 14 are both cross-shaped. The top surface of the connection block 14 is fixed with a connection seat 10 located above the treatment tank 1. A rotating shaft 11 is horizontally rotatably mounted on the connection seat 10. One end of the rotating shaft 11 is fixed with a motor 31 that is fixed to the connection seat 10. The cross-section of the connection seat 10 is U-shaped, and the bottom surface of the connection seat 10 is slidably connected to the top surface of the movable rod 5. The two ends of the rotating shaft 11 are respectively horizontally rotatably connected to the left and right side plates of the connection seat 10. A gear 12 is located outside the connection seat 10. The motors 31 on the two connection seats 10 are symmetrically distributed about the center, and the two motors 31 can operate synchronously with the same rotation speed. The rotating shaft 11 is fixed with a gear 12 that meshes with a rack 13. The top surface of the rack 13 is horizontally fixed with a connecting rod 7 that is fixed to a cylinder 3. The cylinder 3 is fixed to a fixed frame 2 that is fixed to the top surface of the treatment tank 1. The cylinder 3 can control the positions of the cleaning rod 27 and the filter plate 26. The cross-section of the fixed frame 2 is U-shaped, and the fixed frame 2 is fixed to the center of the top surface of the treatment tank 1. The fixed frame 2 is located outside the connecting rod 7, and the inner wall of the fixed frame 2 is slidably connected to the two end walls of the connecting rod 7. There are two cylinders 3, which are respectively located at the two ends of the upper rod of the fixed frame 2. A limiting groove 8 for sliding a limiting rod 9 is horizontally provided on the side wall of the connecting rod 7. The limiting rod 9 is fixed to the connection seat 10. The limiting rod 9 and the limiting groove 8 can ensure the horizontal movement of the connection seat 10 and can also enable the connection seat 10 to move vertically under the action of the cylinder 3. The rack 13 is located above the gear 12. Four limiting grooves 8 are provided, which are respectively located on the two side walls at the front and rear ends of the connecting rod 7. The side wall of the connecting rod 7 is slidably connected to the inner wall of the connection seat 10. The limiting rod 9 is fixed to the upper inner wall of the connection seat 10;The left and right plates of the processing box 1 are both provided with discharge grooves 21 for sliding with the movable plate 24. In order to discharge the impurities in the collection box 28, the movable plate 24 is slidably connected to the inner wall of the collection box 28. The upper inner walls of the side plates of the collection box 28 are both horizontally provided with guide grooves 29 for sliding with the guide blocks 30. The cross section of the guide block 30 is L-shaped. The guide block 30 is fixed to the inner side wall of the left movable plate 24. The guide block 30 and the guide groove 29 ensure the horizontal movement of the movable plate 24. A sealing gasket 22 is fixed to the outer wall of the movable plate 24 to seal between the discharge groove 21 and the movable plate 24 to prevent liquid from flowing out. A connecting shaft 23 is horizontally fixed at the center of the two movable plates 24. The right end of the connecting shaft 23 is fixed with a push-pull rod 19 located outside the processing box 1. The push-pull rod 19 is movably connected with a fixing assembly. The fixing assembly includes a fixing plate 15. The fixing plate 15 is horizontally fixed to the right wall of the processing box 1 and is located above the discharge groove 21. The fixing plate 15 is vertically threadedly connected with a threaded rod 16. The lower end of the threaded rod 16 is fixed with a bearing 18. The outer wall of the bearing 18 is fixed with a limit frame 20. The cross section of the limit frame 20 is inverted U-shaped. The inner wall of the limit frame 20 is fitted with the inner wall of the push-pull rod 19. In order to limit the horizontal position of the push-pull rod 19, the movable plate 24 on the connecting shaft 23 is limited and fixed. A guide rod 17 vertically fixed to the top surface of the limit frame 20 and slidably connected to the fixing plate 15. The cross section of the guide rod 17 is T-shaped to ensure that the limit frame 20 can move vertically.;

[0028] The working principle of the present utility model:

[0029] Refer to the attached instruction manual Figures 1 - 6When cleaning the impurities on the filter plate 26, start the two motors 31, the two motors 31 run synchronously to ensure the same speed, the output end of the motor 31 drives the shaft 11 to rotate on the connecting seat 10, the shaft 11 drives the gear 12 to rotate and move on the rack 13, so that the two connecting seats 10 move toward each other, the connecting seat 10 drives the limit rod 9 to slide in the limit groove 8, and at the same time the connecting seat 10 drives the connecting block 14 to slide in the connecting groove 6, the connecting block 14 drives the vertical rod 25 to move, the vertical rod 25 drives the cleaning rod 27 to slide on the filter plate 26 to push the impurities on the filter plate 26 and push them into the collection frame 28, when the cleaning rod 27 is completely in contact with the top surface of the collection frame 28, that is, the limit rod 9 moves to the maximum limit, the motor 31 is turned off and started. Cylinder 3, the movable end of cylinder 3 drives connecting rod 7 to move up and slide on fixing frame 2, and the connecting seat 10 moves up when the limiting groove 8 on connecting rod 7 passes through limiting rod 9, and the connecting seat 10 is connected with connecting block 14 and connecting groove 6, and the shape of connecting block 14 and connecting groove 6 makes movable rod 5 move up and slide in through groove 4, so that movable rod 5 will not be separated from through groove 4, and horizontal displacement of movable rod 5 is prevented during cleaning process, and connecting block 14 drives vertical rod 25 to move cleaning rod 27 up and separate from filter plate 26, so as to prevent cleaning rod 27 from pushing uncleaned impurities to the side away from collecting frame 28 when restoring to the original position, and after cleaning rod 27 and filter plate 26 are separated, motor 31 is started to move two cleaning rods 27 away from each other and return to the upper part of initial position. , the cleaning rod 27 is brought into contact with the filter plate 26 by moving the movable end of the cylinder 3 downward to complete the cleaning, thereby achieving synchronous cleaning, improving efficiency and reducing effort; when cleaning again, the principle is the same as above; when too many impurities are collected in the collecting frame 28, the threaded rod 16 is rotated to rotate and move upward in the fixed plate 15, and the lower end of the threaded rod 16 is rotated in the limit frame 20 through the bearing 18, and the limit frame 20 is moved upward to disengage from the push-pull rod 19, and at the same time, the limit frame 20 drives the guide rod 17 to slide on the fixed plate 15 to ensure that the limit frame 20 can move vertically, release the horizontal limit of the push-pull rod 19, and make the limit frame 20 located above the discharge trough 21, and then pull the push-pull rod 19 to drive the connecting shaft 23 to move, and the connecting shaft 23 drives the movable plate 24 to slide in the collecting frame 28 The impurities are pushed to be discharged from the processing box 1 from the right discharge slot 21. At the same time, the movable plate 24 on the left drives the guide block 30 to slide in the guide slot 29. When the guide block 30 moves to the maximum limit in the guide slot 29, the push-pull rod 19 is pushed to discharge the uncleaned impurities from the left discharge slot 21 to the processing box 1, so as to avoid the impurities being pushed to the left side of the collection frame 28 and unable to be discharged. After the impurities in the collection frame 28 are cleaned, the push-pull rod 19 is horizontally limited by the fixing assembly, and the collection frame 28 does not need to be taken out to clean the impurities. This solves the problem that when cleaning the impurities on the filter plate, the push-pull handles on both sides are pushed separately to make the push plate push the impurities on the filter plate into the collection frame, and the push plate cannot be moved at the same time, which is troublesome and inefficient.It solves the problem that when the push-pull handles on both sides are pushed simultaneously to push the impurities on the filter plate into the collection box by the push plate, it is laborious to operate due to the certain size of the processing box.

[0030] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A filtering device for wastewater treatment, comprising: A processing box (1) is characterized in that: a filter plate (26) is fixed on the inner wall of the processing box (1), a collecting frame (28) is fixed in the middle of the filter plate (26), a cleaning rod (27) is slidably provided on the top surface of the filter plate (26), a vertical rod (25) is fixed on the top surface of the cleaning rod (27), a connecting block (14) slidably connected to the movable rod (5) is fixed on the upper end of the vertical rod (25), a connecting seat (10) located above the processing box (1) is fixed on the top surface of the connecting block (14), the connecting seat (10) is horizontally rotatable with a rotating shaft (11), one end of the rotating shaft (11) is fixed with a motor (31) fixed to the connecting seat (10), a gear (12) meshing with a rack (13) is fixed on the rotating shaft (11), and the top surface of the rack (13) is horizontally rotatable with a rotating shaft (11). A connecting rod (7) fixed to the cylinder (3) is fixed, the cylinder (3) is fixed to a fixing frame (2) fixed to the top surface of the processing box (1), a limit groove (8) sliding with a limit rod (9) is horizontally opened on the side wall of the connecting rod (7), and the limit rod (9) is fixed to the connecting seat (10); the left and right plates of the processing box (1) are both provided with a discharge groove (21) sliding with a movable plate (24), the movable plate (24) and the inner wall of the collecting frame (28) are slidably connected, a sealing gasket (22) is fixed to the outer wall of the movable plate (24), a connecting shaft (23) is horizontally fixed at the center of the two movable plates (24), a push-pull rod (19) located outside the processing box (1) is fixed to the right end of the connecting shaft (23), and the push-pull rod (19) is movably connected to a fixing component.

2. A filter device for wastewater treatment according to claim 1, characterized in that: The cross section of the collecting frame (28) is U-shaped, the top surface of the collecting frame (28) and the top surface of the filter plate (26) are located on the same horizontal plane, and a plurality of water filtering holes are provided on the collecting frame (28).

3. A filter device for wastewater treatment according to claim 1, characterized in that: Two cleaning rods (27) are provided. The two cleaning rods (27) are respectively located at the front and rear sides of the collecting frame (28). The two end walls of the cleaning rods (27) are slidably connected to the inner wall of the processing box (1). The vertical rod (25) and the center of the top surface of the cleaning rod (27) are fixed.

4. A filter device for wastewater treatment according to claim 1, characterized in that: A through slot (4) is horizontally provided at the center of the top plate of the processing box (1); a movable rod (5) is movably connected to the through slot (4); a connecting slot (6) is horizontally provided on the movable rod (5) and is slidable with a connecting block (14); and the cross sections of the connecting slot (6) and the connecting block (14) are both cross-shaped.

5. A filter device for wastewater treatment according to claim 1, characterized in that: The cross section of the connecting seat (10) is U-shaped, the bottom surface of the connecting seat (10) is slidably connected to the top surface of the movable rod (5), the two ends of the rotating shaft (11) are respectively connected to the left and right side plates of the connecting seat (10) for horizontal rotation, the gear (12) is located on the outside of the connecting seat (10), and the motors (31) on the two connecting seats (10) are distributed symmetrically with respect to the center.

6. A filter device for wastewater treatment according to claim 1, characterized in that: The rack (13) is located on the upper side of the gear (12), and four limiting grooves (8) are respectively located on the two side walls at the front and rear ends of the connecting rod (7), the side wall of the connecting rod (7) and the inner wall of the connecting seat (10) are slidably connected, and the limiting rod (9) and the upper inner wall of the connecting seat (10) are fixed.

7. A filter device for wastewater treatment according to claim 1, characterized in that: The cross section of the fixing frame (2) is U-shaped. The fixing frame (2) and the top center of the processing box (1) are fixed. The fixing frame (2) is located outside the connecting rod (7). The inner wall of the fixing frame (2) and the two end walls of the connecting rod (7) are slidably connected. Two cylinders (3) are provided and are respectively located at the two ends of the upper rod of the fixing frame (2).

8. A filter device for wastewater treatment according to claim 1, characterized in that: The inner wall of the upper end of the side plate of the collecting frame (28) is horizontally provided with a guide groove (29) for sliding with a guide block (30). The guide block (30) has an L-shaped cross section. The guide block (30) is fixed to the inner side wall of the movable plate (24) on the left side.

9. A filter device for wastewater treatment according to claim 1, characterized in that: The fixing assembly comprises a fixing plate (15), the fixing plate (15) and the right wall of the processing box (1) are fixed horizontally, and the fixing plate (15) is located above the discharge trough (21), the fixing plate (15) is vertically threadedly connected with a threaded rod (16), a bearing (18) is fixed at the lower end of the threaded rod (16), a limiting frame (20) is fixed to the outer wall of the bearing (18), the cross section of the limiting frame (20) is inverted U shape, the inner wall of the limiting frame (20) is in contact with the inner wall of the push-pull rod (19), and a guide rod (17) slidably connected to the fixing plate (15) is vertically fixed to the top surface of the limiting frame (20), and the cross section of the guide rod (17) is T-shaped.

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