Caulking gypsum powder batching device

Abstract

The utility model discloses a caulking gypsum powder batching device which effectively solves the problems that the manufacturing cost is high and linkage control over opening and closing of a discharging opening is inconvenient due to the fact that a plurality of motors are needed for respective control. Comprising a base, a supporting plate is fixedly connected to the upper end of the base, a plurality of raw material bins evenly distributed in the left-right direction of the supporting plate are fixedly connected to the supporting plate, and conveying pipes are fixedly connected to the lower ends of the raw material bins; by arranging the raw material bin, the conveying pipe, the auger, the discharging opening and the closing assembly, raw materials can be driven to be conveyed to the discharging opening through rotation of the auger, meanwhile, the closing assembly can be in linkage with movement of the bevel gear to control opening and closing of the discharging opening, and batching is facilitated; the hexagonal prism, the bevel gear and the bevel gears are arranged, the bevel gear can be driven by the hexagonal prism to rotate, different raw materials can be controlled to be discharged by changing the position of the bevel gear to be meshed with different bevel gears, motor arrangement is reduced, the manufacturing cost is reduced, and practicability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gypsum powder batching, in particular to a caulking gypsum powder batching device. Background Art

[0002] Caulking gypsum is made of fine semi-hydrated gypsum powder added with measured adhesive. It is suitable for filling joints in building wall panels, such as cement boards, gypsum boards, top plates and nail holes, as well as other parts that require caulking. During the production process of caulking gypsum powder, it is necessary to add raw materials such as calcium powder and thickeners as well as additives to the gypsum powder to improve the adhesion and other properties of the caulking gypsum powder, thereby improving product quality. In the existing batching device, each raw material barrel needs to be equipped with a motor to control the feeding during the batching process. The cost is expensive and it is not convenient to control the opening and closing of the feeding port in a linked manner, which needs to be solved urgently. Utility Model Content

[0003] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the utility model is to provide a caulking gypsum powder batching device, which effectively solves the problem that multiple motors need to be controlled separately, resulting in high costs and inconvenience in linkage control of the opening and closing of the feed port.

[0004] The technical solution is as follows: the utility model comprises a base, the upper end of the base is fixedly connected with a support plate, a plurality of raw material bins evenly distributed along the left and right directions thereof are fixedly connected with the support plate, a feed pipe is fixedly connected with the lower end of the raw material bin, a rotatable auger is arranged in the feed pipe, a feed discharge port is arranged at the lower front end of the feed pipe, a closing component is arranged at the front side of the lower end of the feed pipe, the closing component can be used to cover the feed discharge port, a hexagonal prism which can be moved forward and backward and can be rotated is arranged at the front side of the upper end of the support plate, a bevel gear which can be moved left and right is slidably connected to the outer wall of the hexagonal prism, a helical gear which can mesh with the bevel gear is fixed at the front end of the auger, a batching bin is hinged at the lower end of the support plate, and the batching bin can swing.

[0005] The upper end of the support plate is slidably connected to a sliding seat, the upper end of the sliding seat is fixedly connected to a driving motor, the output end of the driving motor is fixedly connected to the right end of the hexagonal prism, the upper end of the support plate is fixedly connected to two left-right symmetrical brackets, the rear side of the bracket is provided with a waist-shaped groove, the left and right sides of the hexagonal prism are respectively located in the waist-shaped grooves on the corresponding sides, the upper end of the middle feed pipe is fixedly connected to a hydraulic cylinder, the output end of the hydraulic cylinder is fixedly connected to an L-shaped push-pull rod, the front side of the push-pull rod is slidably connected to a connecting frame, the outer wall of the push-pull rod is sleeved with a reset spring located between the push-pull rod and the connecting frame, and the connecting frame is rotatably connected to the hexagonal prism.

[0006] The closing assembly includes two left and right opposing shielding plates, which can be slidably connected to the feed pipe, a telescopic rod is provided on the lower side of the two shielding plates, and the left and right sides of the telescopic rod are respectively fixedly connected to the shielding plates on their corresponding sides, a tension spring is sleeved on the telescopic rod, an inclined groove is provided at the lower end of the front side of the shielding plate, the distance between the front ends of the two inclined grooves is greater than the distance between the rear ends, a T-shaped driving rod is provided on the lower side of the shielding plate, and the left and right sides of the driving rod are respectively inserted into the inclined grooves on their corresponding sides, and two left-right symmetrical and L-shaped limit rods are fixedly connected to the front side of the driving rod, and the limit rod is slidably connected to the feed pipe.

[0007] A lead screw is provided on the upper side of the support plate, and the left and right sides of the lead screw are rotatably connected to the brackets on the corresponding sides respectively, a telescopic frame is threadedly connected to the middle part of the lead screw, and the rear side of the telescopic frame is rotatably connected to the bevel gear, a top block is fixedly connected to the lower side of the telescopic frame, and the rear end of the top block can contact the front end of the driving rod, a main gear is fixedly connected to the right side of the hexagonal prism, and a slave gear that can mesh with the main gear is fixedly connected to the right side of the lead screw.

[0008] The upper end of the support plate is fixedly connected to a support frame, a rotatable turntable is provided on the left side of the support frame, an L-shaped connecting rod is fixedly connected to the lower end of the turntable, a spur gear is fixedly connected to the right side of the batching bin, a rack is provided on the upper side of the spur gear, the rack is slidably connected to the support plate, a connecting rod is fixedly connected to the front end of the rack, the connecting rod is slidably connected to the support plate, a movable groove is opened on the left side of the connecting rod, and the lower left end of the connecting rod is located in the movable groove.

[0009] The upper end of the support frame is slidably connected with a moving plate, the rear end of the moving plate can contact the front end of the push-pull rod, the front side of the moving plate is provided with a yielding groove, and the rotating disk is fixedly connected with an insertion rod located in the yielding groove.

[0010] The outer wall of the support frame is fixedly connected with a positioning rod, the positioning rod is slidably connected with the moving plate, and a compression spring located between the moving plate and the support frame is sleeved on the positioning rod.

[0011] The utility model can utilize the rotation of the auger to convey the raw materials to the discharge port by arranging a raw material bin, a feeding pipe, an auger, a discharge port and a closing component. At the same time, the closing component can be linked with the movement of the bevel gear to control the opening and closing of the discharge port, which is convenient for batching. The hexagonal prism, the bevel gear and the helical gear can be used to drive the bevel gear to rotate by the hexagonal prism. By changing the position of the bevel gear to mesh with different helical gears, different raw materials can be controlled for discharge, thereby reducing the setting of motors, reducing the cost and improving practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the main axonometric drawing of the utility model.

[0013] Figure 2 It is an axonometric view from above with the base removed in the utility model.

[0014] Figure 3It is an axonometric view of the raw material bin in the utility model when viewed from above.

[0015] Figure 4 It is a left axonometric view of the hydraulic cylinder in the utility model.

[0016] Figure 5 It is a partially cutaway right axonometric view of the main gear in the utility model.

[0017] In the figure: 1. base; 2. support plate; 3. raw material bin; 4. feed pipe; 5. auger; 6. discharge port; 7. closing assembly; 8. hexagonal prism; 9. bevel gear; 10. helical gear; 11. batching bin; 12. sliding seat; 13. driving motor; 14. hydraulic cylinder; 15. push-pull rod; 16. connecting frame; 17. shielding plate; 18. telescopic rod; 19. inclined groove; 20. driving rod; 21. limit rod; 22. lead screw; 23. telescopic frame; 24. top block; 25. main gear; 26. slave gear; 27. support frame; 28. turntable; 29. ​​connecting rod; 30. spur gear; 31. rack; 32. connecting rod; 33. movable groove; 34. moving plate; 35. clearance groove; 36. plug rod; 37. positioning rod. DETAILED DESCRIPTION

[0018] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0019] Depend on Figures 1 to 5 It is given, including a base 1, a support plate 2 is fixedly connected to the upper end of the base 1, a plurality of raw material bins 3 evenly distributed along the left and right directions thereof are fixedly connected to the support plate 2, a feed pipe 4 is fixedly connected to the lower end of the raw material bin 3, a rotatable auger 5 is arranged in the feed pipe 4, a discharge port 6 is opened at the lower front end of the feed pipe 4, a closing component 7 is arranged at the front side of the lower end of the feed pipe 4, the closing component 7 can be used to cover the discharge port 6, a hexagonal prism 8 which can be moved forward and backward and can be rotated is arranged at the front side of the upper end of the support plate 2, a bevel gear 9 which can be moved left and right is slidably connected to the outer wall of the hexagonal prism 8, a bevel gear 10 which can mesh with the bevel gear 9 is fixed to the front end of the auger 5, a batching bin 11 is hinged at the lower end of the support plate 2, and the batching bin 11 can swing.

[0020] like Figures 1 to 5 As shown, the raw material bin 3, the feed pipe 4, the auger 5, the discharge port 6 and the closing component 7 are arranged, and the rotation of the auger 5 can be used to drive the raw materials entering from the raw material bin 3 into the feed pipe 4 to be transported to the discharge port 6, and then the discharge time of the raw materials is controlled by the opening and closing of the discharge port 6, so as to achieve the purpose of controlling the discharge and facilitate the batching. The hexagonal prism 8, the bevel gear 9 and the helical gear 10 are arranged, and the hexagonal prism 8 can be used to drive the bevel gear 9 to rotate. By changing the position of the bevel gear 9 to mesh with different helical gears 10, it is possible to control the discharge of different raw materials, reduce the motor setting, reduce the cost and improve the practicality.

[0021] The upper end of the support plate 2 is slidably connected to a sliding seat 12, and the upper end of the sliding seat 12 is fixedly connected to a driving motor 13, and the output end of the driving motor 13 is fixedly connected to the right end of the hexagonal prism 8. Two left-right symmetrical brackets are fixedly connected to the upper end of the support plate 2, and a waist-shaped groove is opened on the rear side of the bracket. The left and right sides of the hexagonal prism 8 are respectively located in the waist-shaped grooves on the corresponding sides. A hydraulic cylinder 14 is fixedly connected to the upper end of the middle feeding pipe 4, and an L-shaped push-pull rod 15 is fixedly connected to the output end of the hydraulic cylinder 14. The front side of the push-pull rod 15 is slidably connected to a connecting frame 16, and the outer wall of the push-pull rod 15 is sleeved with a reset spring located between the push-pull rod 15 and the connecting frame 16, and the connecting frame 16 is rotatably connected to the hexagonal prism 8.

[0022] like Figures 1 to 4 As shown, the sliding seat 12 and the driving motor 13 are provided so that the driving motor 13 can move synchronously with the hexagonal prism 8 and drive the hexagonal prism 8 to rotate. The bracket and the waist-shaped groove are provided so as to support the hexagonal prism 8 and the lead screw 22 to prevent them from being skewed. The waist-shaped groove is convenient for the hexagonal prism 8 to move forward and backward. The hydraulic cylinder 14, the push-pull rod 15, the connecting frame 16 and the reset spring are provided so as to utilize the hydraulic cylinder 14 to drive the hexagonal prism 8 to move forward and backward through the action of the push-pull rod 15 and the connecting frame 16. At the same time, when the push-pull rod 15 drives the hexagonal prism 8 to move to the front end limit position, the push-pull rod 15 can continue to move forward to contact the moving plate 34 and drive the moving plate 34 to move forward, and the reset spring contracts. This setting can change the position of the hexagonal prism 8 after completing the unloading of a raw material, so that the bevel gear 9 is disengaged from the helical gear 10, and the lead screw 22 can be used to change the position of the bevel gear 9 to engage with the helical gear 10 on other raw material bins 3, so as to drive the auger 5 of other raw material bins 3 to unload.

[0023] The closing assembly 7 includes two left and right opposing baffle plates 17, which can be slidably connected to the feed pipe 4. A telescopic rod 18 is provided on the lower side of the two baffle plates 17. The left and right sides of the telescopic rod 18 are respectively fixedly connected to the baffle plates 17 on their corresponding sides. A tension spring is sleeved on the telescopic rod 18. An inclined groove 19 is provided at the lower end of the front side of the baffle plate 17. The distance between the front ends of the two inclined grooves 19 is greater than the distance between the rear ends. A T-shaped driving rod 20 is provided on the lower side of the baffle plate 17. The left and right sides of the driving rod 20 are respectively inserted into the inclined grooves 19 on their corresponding sides. Two left-right symmetrical and L-shaped limit rods 21 are fixedly connected to the front side of the driving rod 20, and the limit rod 21 is slidably connected to the feed pipe 4.

[0024] like Figures 1 to 3As shown, the baffle plate 17, the inclined groove 19, the driving rod 20 and the limiting rod 21 are provided. The forward and backward movement of the driving rod 20 can be utilized to drive the two baffle plates 17 to move oppositely through the action of the inclined groove 19, so as to achieve the purpose of opening the discharge port 6. The telescopic rod 18 and the tension spring are provided to facilitate the closing of the two baffle plates 17 without the action of external force, thereby ensuring that the discharge port 6 is closed after the discharge is completed. The limiting rod 21 is provided to facilitate the limiting of the driving rod 20 to avoid the driving rod 20 from being skewed.

[0025] A lead screw 22 is provided on the upper side of the support plate 2, and the left and right sides of the lead screw 22 are rotatably connected to the brackets on their corresponding sides respectively. A telescopic frame 23 is threadedly connected to the middle part of the lead screw 22, and the rear side of the telescopic frame 23 is rotatably connected to the bevel gear 9, and a top block 24 is fixedly connected to the lower side of the telescopic frame 23, and the rear end of the top block 24 can contact the front end of the driving rod 20, a main gear 25 is fixedly connected to the right side of the hexagonal prism 8, and a slave gear 26 that can mesh with the main gear 25 is fixedly connected to the right side of the lead screw 22.

[0026] like Figures 1 to 4 As shown, the screw 22, telescopic frame 23, main gear 25 and slave gear 26 are arranged so that when the hydraulic cylinder 14 is used to drive the hexagonal prism 8 to move forward to the extreme position, the main gear 25 is engaged with the slave gear 26. At this time, the driving motor 13 can drive the screw 22 to rotate, and then use the screw 22 and the telescopic frame 23 to drive the bevel gear 9 to adjust the position, so as to change the position of the bevel gear 9, thereby achieving the purpose of driving different raw material bins 3 to discharge materials. The screw 22 has a self-locking ability to prevent the bevel gear 9 from moving at will when the hexagonal prism 8 drives the bevel gear 9 to rotate.

[0027] The upper end of the support plate 2 is fixedly connected to a support frame 27, a rotatable turntable 28 is provided on the left side of the support frame 27, an L-shaped connecting rod 29 is fixedly connected to the lower end of the turntable 28, a spur gear 30 is fixedly connected to the right side of the batching bin 11, a rack 31 is provided on the upper side of the spur gear 30, the rack 31 is slidably connected to the support plate 2, a connecting rod 32 is fixedly connected to the front end of the rack 31, the connecting rod 32 is slidably connected to the support plate 2, a movable groove 33 is opened on the left side of the connecting rod 32, and the lower left end of the connecting rod 29 is located in the movable groove 33.

[0028] like Figures 1 to 4 As shown, the support frame 27, turntable 28, connecting rod 29, spur gear 30, rack 31, connecting rod 32 and movable groove 33 are arranged to facilitate the rotation of the turntable 28, so that the connecting rod 32 is driven forward by the connecting rod 29 and then the rack 31 is used to drive the spur gear to rotate, thereby achieving the purpose of rotating the batching bin 11. When the raw materials in the batching bin 11 are proportioned, they can be dumped for the next batching.

[0029] The upper end of the support frame 27 is slidably connected with a moving plate 34 , the rear end of the moving plate 34 can contact the front end of the push-pull rod 15 , the front side of the moving plate 34 is provided with a clearance groove 35 , and the turntable 28 is fixedly connected with an insertion rod 36 located in the clearance groove 35 .

[0030] like Figure 4 As shown, the movable plate 34, the clearance groove 35 and the insertion rod 36 are arranged so that the push-pull rod 15 can be used to drive the movable plate 34 to move backward, and then the turntable 28 is driven to rotate through the insertion rod 36 and the clearance groove 35, providing power for the rotation of the turntable 28.

[0031] The outer wall of the support frame 27 is fixedly connected with a positioning rod 37 , the positioning rod 37 is slidably connected with the moving plate 34 , and a compression spring located between the moving plate 34 and the support frame 27 is sleeved on the positioning rod 37 .

[0032] like Figure 4 As shown, setting a positioning rod 37 and a compression spring can utilize the positioning rod 37 to ensure that the compression spring will not be skewed. Setting the compression spring can enable the movable plate 34 to move backward when the push-pull rod 15 moves backward to make the turntable 28 rotate and the movable plate 34 return to its position. A volute spring can be additionally provided at the connection between the batching bin 11 and the bracket to ensure that the batching bin 11 can be twisted to open upward, thereby ensuring normal batching next time.

[0033] When the utility model is in use, when it is necessary to discharge materials from one of the raw material bins 3, the hydraulic cylinder 14 drives the connecting frame 16 to move forward through the push-pull rod 15 and the reset spring, and the connecting frame 16 drives the hexagonal prism 8 to move forward, and the telescopic frame 23 contracts. When the push-pull rod 15 drives the hexagonal prism 8 to move to the front limit position, it stops. At this time, the main gear 25 is meshed with the slave gear 26, and then the drive motor 13 is started. The drive motor 13 drives the lead screw 22 to rotate, and the lead screw 22 drives the bevel gear 9 to move through the telescopic frame 23. When the bevel gear 9 moves to the position where it can be connected to the raw material bin 3 where materials need to be discharged, the drive motor 13 is stopped;

[0034] The hydraulic cylinder 14 is started to drive the push-pull rod 15 to move backward, and the push-pull rod 15 drives the hexagonal prism 8 to move backward, the main gear 25 is disengaged from the slave gear 26, and the bevel gear 9 gradually engages with its opposite helical gear 10. At the same time, the telescopic frame 23 drives the top block 24 to move backward, and the top block 24 contacts the driving rod 20, driving the driving rod 20 to gradually move backward, and the driving rod 20 drives the shielding plate 17 to open, the telescopic rod 18 is extended, and the tension spring gradually accumulates elastic force;

[0035] After the meshing is completed, the material discharge port 6 is fully opened, and the drive motor 13 is started at this time. The drive motor 13 rotates through the bevel gear 9 of the hexagonal prism 8, and the bevel gear 9 drives the auger 5 to rotate through the helical gear 10, and the material discharge begins. The raw materials enter the batching bin 11. When the raw material batching is completed, the drive motor 13 is turned off, and the hydraulic rod is started to drive the connecting frame 16 to move forward through the push rod. The top block 24 is out of contact with the drive rod 20, and the tension spring drives the shielding plates 17 on both sides to close. When the connecting frame 16 moves to the front limit position, the connecting frame 16 stops, the reset spring contracts, and the push-pull rod 15 continues to move forward until it contacts with the moving plate 34, and drives the moving plate 34 to move forward. The moving plate 34 drives the turntable 28 to rotate through the insertion rod 36, and the compression spring contracts. The turntable 28 drives the rack 31 to move forward through the connecting rod 29 and the connecting rod 32, and the rack 31 drives the spur gear 30 to rotate. The batching bin 11 dumps the prepared raw materials inside, and then the hydraulic rod is recovered backward. The moving plate 34 moves forward under the action of the compression spring, and the batching bin 11 gradually rotates and stops when it rotates to the opening facing upward. At this time, the hydraulic rod is no longer in contact with the moving rod plate, and the next batching can be carried out.

[0036] In the present invention, the driving motor 13 and the hydraulic cylinder 14 are both prior art and will not be described in detail herein.

[0037] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A caulking gypsum powder batching device, comprising a base (1), characterized in that: The upper end of the base (1) is fixedly connected to a support plate (2), a plurality of raw material bins (3) evenly distributed along the left and right directions of the support plate (2) are fixedly connected to the support plate (2), a feed pipe (4) is fixedly connected to the lower end of the raw material bin (3), a rotatable auger (5) is arranged in the feed pipe (4), a feed outlet (6) is opened at the lower end of the front side of the feed pipe (4), a closing component (7) is arranged at the front side of the lower end of the feed pipe (4), and the closing component (7) can be used to cover the feed outlet (6), a hexagonal prism (8) that can move forward and backward and can rotate is arranged at the front side of the upper end of the support plate (2), a bevel gear (9) that can move left and right is slidably connected to the outer wall of the hexagonal prism (8), a helical gear (10) that can mesh with the bevel gear (9) is fixed at the front end of the auger (5), and a batching bin (11) is hingedly connected to the lower end of the support plate (2), and the batching bin (11) can swing.

2. A caulking gypsum powder batching device according to claim 1, characterized in that: The upper end of the support plate (2) is slidably connected to a sliding seat (12), the upper end of the sliding seat (12) is fixedly connected to a driving motor (13), the output end of the driving motor (13) is fixedly connected to the right end of the hexagonal prism (8), the upper end of the support plate (2) is fixedly connected to two left-right symmetrical brackets, the rear side of the brackets is provided with waist-shaped grooves, the left and right sides of the hexagonal prism (8) are respectively located in the waist-shaped grooves on the corresponding sides, the upper end of the middle material conveying pipe (4) is fixedly connected to a hydraulic cylinder (14), the output end of the hydraulic cylinder (14) is fixedly connected to an L-shaped push-pull rod (15), the front side of the push-pull rod (15) is slidably connected to a connecting frame (16), the outer wall of the push-pull rod (15) is sleeved with a reset spring located between the push-pull rod (15) and the connecting frame (16), and the connecting frame (16) is rotatably connected to the hexagonal prism (8).

3. A caulking gypsum powder batching device according to claim 1, characterized in that: The closing assembly (7) comprises two left and right opposing shielding plates (17), the shielding plates (17) being slidably connected to the feed pipe (4), a telescopic rod (18) being provided at the lower side of the two shielding plates (17), the left and right sides of the telescopic rod (18) being respectively fixedly connected to the shielding plates (17) at the corresponding sides, a tension spring being sleeved on the telescopic rod (18), an inclined groove (19) being provided at the lower front end of the shielding plate (17), the distance between the front ends of the two inclined grooves (19) being greater than the distance between the rear ends, a T-shaped driving rod (20) being provided at the lower side of the shielding plate (17), the left and right sides of the driving rod (20) being respectively inserted into the inclined grooves (19) at the corresponding sides, two left and right symmetrical L-shaped limiting rods (21) being fixedly connected to the front side of the driving rod (20), the limiting rod (21) being slidably connected to the feed pipe (4).

4. A caulking gypsum powder batching device according to claim 1, characterized in that: A lead screw (22) is provided on the upper side of the support plate (2), and the left and right sides of the lead screw (22) are respectively rotatably connected to the brackets on the corresponding sides thereof, a telescopic frame (23) is threadedly connected to the middle part of the lead screw (22), and the rear side of the telescopic frame (23) is rotatably connected to the bevel gear (9), a top block (24) is fixedly connected to the lower side of the telescopic frame (23), and the rear end of the top block (24) can contact the front end of the driving rod (20), a main gear (25) is fixedly connected to the right side of the hexagonal prism (8), and a slave gear (26) that can mesh with the main gear (25) is fixedly connected to the right side of the lead screw (22).

5. A caulking gypsum powder batching device according to claim 1, characterized in that: The upper end of the support plate (2) is fixedly connected to a support frame (27), a rotatable turntable (28) is provided on the left side of the support frame (27), an L-shaped connecting rod (29) is fixedly connected to the lower end of the turntable (28), a spur gear (30) is fixedly connected to the right side of the batching bin (11), a rack (31) is provided on the upper side of the spur gear (30), the rack (31) is slidably connected to the support plate (2), a connecting rod (32) is fixedly connected to the front end of the rack (31), the connecting rod (32) is slidably connected to the support plate (2), a movable groove (33) is provided on the left side of the connecting rod (32), and the lower left end of the connecting rod (29) is located in the movable groove (33).

6. A caulking gypsum powder batching device according to claim 5, characterized in that: The upper end of the support frame (27) is slidably connected to a moving plate (34), the rear end of the moving plate (34) can contact the front end of the push-pull rod (15), the front side of the moving plate (34) is provided with a clearance groove (35), and the rotating disk (28) is fixedly connected to an insertion rod (36) located in the clearance groove (35).

7. A caulking gypsum powder batching device according to claim 5, characterized in that: A positioning rod (37) is fixedly connected to the outer wall of the support frame (27), the positioning rod (37) is slidably connected to the movable plate (34), and a compression spring located between the movable plate (34) and the support frame (27) is sleeved on the positioning rod (37).

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