A spiral weigher

Abstract

A screw weighing scale relates to the technical field of screw weighing scales and includes a support frame. Two fixed seats are welded to the top of the support frame. A bearing seat is detachably arranged on the top of the fixed seat. A cylinder body is arranged above the support frame. Two fixed rods are welded to the outer wall of the cylinder body. The two fixed rods respectively extend into the two bearing seats and are rotatably connected to the bearing seats. Demountable sealing flanges and sealing plates are respectively arranged at both ends of the cylinder body. A screw shaft rotatably arranged coaxially is arranged inside the cylinder body. Screw blades are welded on the outer wall of the screw shaft. The two ends of the screw shaft are respectively rotatably connected to the sealing flange and the sealing plate. A driving component for driving the screw shaft is arranged at the end of the sealing plate. A connecting component is welded to the top of the support frame. Feed pipes and discharge hoppers communicating with the inner cavity are welded to the outer wall of the cylinder body. The present invention solves the problems of low weighing accuracy and complex installation process of the existing screw weighing scale.

Description

Technical Field

[0001] The present invention relates to the technical field of screw weighing scales, and particularly to a screw weighing scale. Background Art

[0002] A screw weighing scale is a production weighing device for controlling the feeding, dynamic weighing, and continuous conveying of powdery and bulk materials. According to process requirements, the flow rate and flow direction of the materials in the screw conveyor are controlled, and weighing measurements are realized to achieve automated management.

[0003] When the screw weighing scale transports materials, the materials are conveyed by the screw conveyor. The weighing sensor installed on the cylinder detects the weight of the materials and generates a voltage signal proportional to the weighing load and sends it to the controller. After calculating with the detection data of the speed sensor for the rotation speed of the auger shaft, the instantaneous flow rate and cumulative weight value are obtained. The control system compares the actual flow rate signal with the set flow rate signal, and through PID adjustment, outputs a control signal to the frequency converter to dynamically adjust the rotation speed of the motor, thereby realizing quantitative feeding. The screw weighing scale mainly consists of a conveying screw, a frequency converter, a load cell, a speed sensor, and a controller.

[0004] During the use of the existing screw weighing scale, deficiencies have gradually emerged, mainly manifested in the following aspects:

[0005] First, the material weighing accuracy is low. Specifically, the materials are transported through the screw blades in the cylinder. When the cumulative weight value of the transported materials approaches the preset weight value, the controller controls the motor to reduce the rotation speed, thereby slowing down the material transportation speed. When the cumulative weight value of the transported materials reaches the preset weight value, the controller controls the motor to stop rotating, thereby stopping the transportation of the materials. When the screw blades transport the materials, the materials advance forward along the surface of the screw blades, and the transported materials occupy most of the internal space of the cylinder. When the motor stops running, some of the materials pushed by the screw blades closest to the discharge port will still be discharged through the discharge port, and this part of the discharged materials is redundant materials. Therefore, the actual transported amount of the materials is greater than the actual demand, resulting in low material weighing accuracy. Moreover, the larger the screw blades, the more the material exceeds the amount, and the lower the weighing accuracy.

[0006] Second, the installation process is complex. Specifically, during the material transportation process, the load cell needs to detect the weight of the cylinder, so the cylinder cannot be rigidly connected to the silo and can only be connected in a flexible manner. When installing the screw weighing scale, a base needs to be welded at the bottom of the silo, and then the screw weighing scale is installed on the base and flexibly connected to the silo. Therefore, the installation process of the screw weighing scale is complex, time-consuming, and laborious.

[0007] In summary, it is obvious that the existing technology has inconveniences and defects in actual use, so it is necessary to improve it. Summary of the Invention

[0008] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a spiral weighing scale with a weighing accuracy of ≤2‰. The weighing accuracy of the existing spiral weighing scale is ≤2%, which greatly improves the weighing accuracy of materials.

[0009] This spiral weighing scale can be quickly connected to the silo, simplifies the installation process, and improves the practicality of the equipment.

[0010] To solve the above problems, the present invention provides the following technical solutions:

[0011] A spiral weighing scale, comprising a support frame. Two fixed seats are welded to the top of the support frame. A bearing seat is detachably arranged on the top of the fixed seat. A cylinder is arranged above the support frame. Two fixed rods are welded to the outer wall of the cylinder. The two fixed rods respectively extend into the two bearing seats and are rotatably connected to the bearing seats. Detachable sealing flanges and sealing plates are respectively arranged at both ends of the cylinder. A screw shaft is rotatably arranged coaxially in the cylinder. Spiral blades are welded on the outer wall of the screw shaft. The two ends of the screw shaft are respectively rotatably connected to the sealing flange and the sealing plate. A driving component for driving the screw shaft is arranged at the end of the sealing plate. A connecting component is welded to the top of the support frame;

[0012] An inlet pipe and a discharge hopper communicating with the inner cavity are welded to the outer wall of the cylinder. A detachable connecting pipe is arranged below the discharge hopper. A lifting cylinder is arranged coaxially and liftably in the connecting pipe. A circular groove is arranged at the top of the lifting cylinder. A rotating circular plate in frictional contact with the lifting cylinder is rotatably arranged in the circular groove. Arc-shaped grooves are respectively arranged through the top of the rotating circular plate and the bottom of the inner part of the circular groove. A detachable fixed circular plate is inserted into the inner wall at one end of the arc-shaped groove. A discharge hole is arranged through the top of the fixed circular plate. A discharge pipeline communicating with the arc-shaped groove is fixedly connected to the inner top of the lifting cylinder.

[0013] As an optimized scheme, the top of the lifting cylinder is of a frustum-shaped structure. An annular groove is arranged along the circumferential direction on the outer wall of the lifting cylinder. A rubber sheet is laid in the annular groove.

[0014] As an optimized scheme, the connecting component includes a horizontally arranged connecting plate. Four support seats are welded to the top of the support frame. The support seats are detachably connected to the connecting plate. A canvas flexible connection is detachably arranged at the upper port of the inlet pipe. An inlet port is arranged through the top of the connecting plate. A plurality of through positioning holes are evenly distributed along the circumferential direction of the inlet port on the top of the connecting plate.

[0015] As an optimized solution, a U-shaped frame is welded to the top of the support frame. U-shaped plates are welded to the inner top of the U-shaped frame and the upper outer wall of the cylinder body. A load cell is arranged between the two U-shaped plates, and the load cell is detachably connected to the two U-shaped plates through studs and nuts.

[0016] As an optimized solution, the driving assembly includes a fixed frame welded to the end of the sealing plate. A speed reducer is detachably arranged on the top of the fixed frame, and a driving motor is detachably arranged at the end of the speed reducer. The output shaft of the driving motor is connected to the input shaft of the speed reducer. One end of the auger shaft penetrates through the sealing plate and is connected to the output shaft of the speed reducer through a coupling. A speed sensor for detecting the rotation speed of the auger shaft is arranged at the end of the sealing plate.

[0017] As an optimized solution, a horizontally arranged fixed plate is fixedly arranged inside the connecting pipe. Two electric control telescopic cylinders are fixedly arranged on the top of the fixed plate, and the output ends of the electric control telescopic cylinders are fixedly connected to the lifting cylinder.

[0018] As an optimized solution, the fixed plate is fixedly connected to the connecting pipe through a connecting rod.

[0019] As an optimized solution, a rotatably arranged rotating shaft is coaxially arranged at the inner bottom of the circular groove. The rotating shaft is coaxially fixedly connected to the rotating circular plate. A control motor is fixedly arranged at the inner top of the lifting cylinder, and the output shaft of the control motor is fixedly connected to the rotating shaft.

[0020] As an optimized solution, a slot is arranged on the inner wall of the arc-shaped groove. A plug board is fixedly connected to the side wall of the fixed circular plate. The plug board is connected to the rotating circular plate or the lifting cylinder through screws. The thickness of the fixed circular plate is the same as the depth of the arc-shaped groove.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. When the screw weigher is connected to the silo, the screw weigher is lifted until the connecting plate abuts against the discharge port of the silo and the positioning holes are aligned with the holes on the flange of the discharge port of the silo. Bolts are sequentially passed through the flange holes of the upper port of the canvas flexible connection, the positioning holes and the flange holes of the discharge port of the silo and fixed with nuts, thereby connecting the screw weigher to the silo. The feed pipe is flexibly connected to the silo through the canvas flexible connection. The screw weigher can be quickly connected to the silo, simplifying the installation process and improving the practicality of the equipment;

[0023] 2. When quantitatively conveying materials, the materials in the silo enter the cylinder through the feed pipe. The driving motor drives the auger shaft and the spiral blade to rotate. The spiral blade pushes the materials in the cylinder forward, and the materials in the cylinder are discharged through the discharge hopper and the connecting pipe. At the same time, the load cell detects the weight of the materials in the cylinder, and the speed sensor detects the rotation speed of the auger shaft. The detection data is transmitted back to the controller. After the controller calculates the detection data, the instantaneous flow rate and the cumulative weight value are obtained. When the cumulative weight value of the conveyed materials is close to the preset weight value, the controller controls the driving motor to reduce the speed, thereby slowing down the transportation speed of the materials. At the same time, the controller controls the electric telescopic cylinder to extend until the lifting cylinder abuts against the discharge hopper, thereby closing the discharge channel. After a certain amount of materials accumulates in the discharge hopper, the driving motor stops rotating, and the control motor rotates until the arc-shaped grooves on the rotating circular plate and the lifting cylinder completely overlap. The materials accumulated in the discharge hopper are discharged outward through the arc-shaped grooves and the discharge pipeline. The load cell detects the change in the weight of the materials. As the cumulative discharged weight value of the materials approaches the preset weight value, the control motor slowly resets until the two fixed circular plates completely overlap. At this time, a very small amount of materials in the discharge hopper are discharged through the discharge holes. When the cumulative discharged weight value of the materials reaches the preset weight value, the control motor drives the rotating circular plate to reset, thereby closing the discharge channel again. When the cumulative discharged weight value of the materials is closer to the preset weight value, the discharge channel of the materials becomes smaller, effectively preventing the problem of over-discharge of materials at the end of the discharge period. The measurement accuracy of this screw weigher is ≤2‰, while the measurement accuracy of the existing screw weigher is ≤2%, greatly improving the measurement accuracy of the materials. Description of the Drawings

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts do not necessarily draw according to the actual scale.

[0025] Figure 1 Structural schematic diagram of the present invention;

[0026] Figure 2 Structural schematic diagram of the interior of the cylinder of the present invention;

[0027] Figure 3 Structural schematic diagram of the interior of the lifting cylinder of the present invention;

[0028] Figure 4 Structural schematic diagram of the lifting cylinder and the rotating circular plate of the present invention;

[0029] Figure 5 Structural schematic diagram of the connecting component of the present invention;

[0030] Figure 6 Structural schematic diagram of the U-shaped frame of the present invention;

[0031] Figure 7 Structural schematic diagram of the arc-shaped groove and the fixed circular plate of the present invention.

[0032] In the figure: 1 - support frame; 2 - bearing seat; 3 - fixed seat; 4 - fixed rod; 5 - fixing frame; 6 - coupling; 7 - driving motor; 8 - driving assembly; 9 - reducer; 10 - sealing plate; 11 - connecting assembly; 12 - feed pipe; 13 - cylinder body; 14 - sealing flange; 15 - discharge hopper; 16 - spiral blade; 17 - auger shaft; 18 - speed measuring sensor; 19 - U-shaped frame; 20 - load cell; 21 - U-shaped plate; 22 - rubber sheet; 23 - lifting cylinder; 24 - connecting pipe; 25 - discharge pipeline; 26 - annular groove; 27 - circular groove; 28 - rotating circular plate; 29 - discharge hole; 30 - fixed circular plate; 31 - arc-shaped groove; 32 - rotating shaft; 33 - control motor; 34 - electric control telescopic cylinder; 35 - connecting rod; 36 - fixing plate; 37 - insertion plate; 38 - insertion slot; 39 - positioning hole; 40 - feed inlet; 41 - connecting plate; 42 - support seat; 43 - canvas flexible connection. Specific embodiments

[0033] Hereinafter, embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0034] As Figures 1 to 7 shown, a spiral weigher includes a support frame 1. Two fixed seats 3 are welded to the top of the support frame 1. A detachable bearing seat 2 is provided on the top of the fixed seat 3. A cylinder body 13 is provided above the support frame 1. Two fixed rods 4 are welded to the outer wall of the cylinder body 13. The two fixed rods 4 respectively extend into the two bearing seats 2 and are rotatably connected to the bearing seats 2. Detachable sealing flanges 14 and sealing plates 10 are respectively provided at both ends of the cylinder body 13. An auger shaft 17 rotatably arranged coaxially is provided inside the cylinder body 13. A spiral blade 16 is welded to the outer wall of the auger shaft 17. The two ends of the auger shaft 17 are respectively rotatably connected to the sealing flange 14 and the sealing plate 10. A driving assembly 8 for driving the auger shaft 17 is provided at the end of the sealing plate 10. A connecting assembly 11 is welded to the top of the support frame 1;

[0035] The outer wall of the cylinder body 13 is welded with a feed pipe 12 and a discharge hopper 15 that communicate with its inner cavity. A connecting pipe 24 is detachably arranged below the discharge hopper 15. A lifting cylinder 23 is coaxially arranged and lifted in the connecting pipe 24. A circular groove 27 is provided at the top of the lifting cylinder 23. A rotating circular plate 28 that is in frictional contact with the lifting cylinder 23 is rotatably arranged in the circular groove 27. Arc-shaped grooves 31 are provided through the top of the rotating circular plate 28 and the inner bottom of the circular groove 27. A fixed circular plate 30 is detachably inserted into the inner wall of one end of the arc-shaped groove 31. A discharge hole 29 is provided through the top of the fixed circular plate 30. A discharge pipeline 25 that communicates with the arc-shaped groove 31 is fixedly connected to the inner top of the lifting cylinder 23.

[0036] The top of the lifting cylinder 23 is of a frustum-shaped structure. An annular groove 26 is provided along the circumferential direction on the outer wall of the lifting cylinder 23. A rubber sheet 22 is laid in the annular groove 26.

[0037] The connecting component 11 includes a horizontally arranged connecting plate 41. Four support seats 42 are welded to the top of the support frame 1. The support seats 42 are detachably connected to the connecting plate 41. A canvas flexible connection 43 is detachably arranged at the upper port of the feed pipe 12. A feed port 40 is provided through the top of the connecting plate 41. A number of positioning holes 39 are uniformly distributed along the circumferential direction of the feed port 40 on the top of the connecting plate 41.

[0038] A U-shaped frame 19 is welded to the top of the support frame 1. U-shaped plates 21 are welded to the inner top of the U-shaped frame 19 and the upper outer wall of the cylinder body 13 respectively. A load cell 20 is arranged between the two U-shaped plates 21. The load cell 20 is detachably connected to the two U-shaped plates 21 through studs and nuts.

[0039] The driving component 8 includes a fixed frame 5 welded to the end of the sealing plate 10. A speed reducer 9 is detachably arranged on the top of the fixed frame 5. A driving motor 7 is detachably arranged at the end of the speed reducer 9. The output shaft of the driving motor 7 is connected to the input shaft of the speed reducer 9. One end of the auger shaft 17 penetrates through the sealing plate 10 and is connected to the output shaft of the speed reducer 9 through a coupling 6. A speed measuring sensor 18 for detecting the rotation speed of the auger shaft 17 is arranged at the end of the sealing plate 10.

[0040] A horizontally arranged fixed plate 36 is fixedly arranged in the connecting pipe 24. Two electric control telescopic cylinders 34 are fixedly arranged on the top of the fixed plate 36. The output ends of the electric control telescopic cylinders 34 are fixedly connected to the lifting cylinder 23.

[0041] The fixed plate 36 is fixedly connected to the connecting pipe 24 through a connecting rod 35.

[0042] The inner bottom of the circular groove 27 is coaxially provided with a rotating shaft 32 which is rotatably arranged. The rotating shaft 32 is coaxially and fixedly connected with the rotating circular plate 28. The inner top of the lifting cylinder 23 is fixedly provided with a control motor 33. The output shaft of the control motor 33 is fixedly connected with the rotating shaft 32.

[0043] The inner wall of the arc-shaped groove 31 is provided with a slot 38. A plug board 37 is fixedly connected to the side wall of the fixed circular plate 30. The plug board 37 is connected to the rotating circular plate 28 or the lifting cylinder 23 by screws. The thickness of the fixed circular plate 30 is the same as the depth of the arc-shaped groove 31.

[0044] Both the driving motor 7 and the control motor 33 are electrically connected to the controller through a frequency converter. The load cell 20, the speed sensor 18 and the electric control telescopic cylinder 34 are electrically connected to the controller.

[0045] The working principle of this device is as follows:

[0046] When the screw weigher is connected to the silo, the screw weigher is lifted until the connecting plate 41 abuts against the discharge port of the silo and the positioning hole 39 is aligned with the holes on the flange of the discharge port of the silo. Bolts are sequentially passed through the flange holes of the upper port of the canvas flexible connection 43, the positioning hole 39 and the flange holes of the discharge port of the silo and fixed with nuts, so as to connect the screw weigher to the silo. The feed pipe 12 is flexibly connected to the silo through the canvas flexible connection 43. This screw weigher can be quickly connected to the silo, simplifies the installation process and improves the practicality of the equipment.

[0047] When quantitatively conveying materials, the materials in the silo enter the cylinder body 13 through the feed pipe 12. The driving motor 7 drives the auger shaft 17 and the spiral blade 16 to rotate. The spiral blade 16 pushes the materials in the cylinder body 13 forward. The materials in the cylinder body 13 are discharged through the discharge hopper 15 and the connecting pipe 24. At the same time, the load cell 20 detects the weight of the materials in the cylinder body 13, and the speed sensor 18 detects the rotation speed of the auger shaft 17. The detected data is transmitted back to the controller. After the controller calculates the detected data, the instantaneous flow rate and the cumulative weight value are obtained. When the cumulative weight value of the conveyed materials approaches the preset weight value, the controller controls the driving motor 7 to reduce the speed, thereby slowing down the transportation speed of the materials. At the same time, the controller controls the electric telescopic cylinder 34 to extend until the lifting cylinder 23 abuts against the discharge hopper 15, thereby closing the discharge channel. After a certain amount of materials accumulate in the discharge hopper 15, the driving motor 7 stops rotating, and the control motor 33 rotates until the arc-shaped grooves 31 on the rotating circular plate 28 and the lifting cylinder 23 completely overlap. The materials accumulated in the discharge hopper 15 are discharged outward through the arc-shaped grooves 31 and the discharge pipe 25. The load cell 20 detects the change in the weight of the materials. As the cumulative discharged weight value of the materials approaches the preset weight value, the control motor 33 slowly resets until the two fixed circular plates 30 completely overlap. At this time, a very small amount of materials in the discharge hopper 15 are discharged through the discharge holes 29. When the cumulative discharged weight value of the materials reaches the preset weight value, the control motor 33 drives the rotating circular plate 28 to reset, thereby closing the discharge channel again. When the cumulative discharged weight value of the materials is closer to the preset weight value, the discharge channel of the materials is smaller, effectively preventing the problem of excessive discharge of materials in the late stage of discharge. The measurement accuracy of this screw weigher is ≤2‰, while the measurement accuracy of the existing screw weigher is ≤2%, greatly improving the measurement accuracy of the materials.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. A spiral weighing scale, characterized in that: The invention comprises a support frame (1), wherein two fixing seats (3) are welded to the top of the support frame (1), a detachably arranged bearing seat (2) is arranged on the top of the fixing seat (3), a cylinder (13) is arranged above the support frame (1), two fixing rods (4) are welded to the outer wall of the cylinder (13), the two fixing rods (4) extend into the two bearing seats (2) respectively and are rotatably connected to the bearing seats (2), two ends of the cylinder (13) are respectively provided with a detachably arranged sealing flange (14) and a sealing plate (10), a rotatably arranged auger shaft (17) is coaxially arranged in the cylinder (13), a spiral blade (16) is welded to the outer wall of the auger shaft (17), two ends of the auger shaft (17) are rotatably connected to the sealing flange (14) and the sealing plate (10), and a driving assembly (8) for driving the auger shaft (17) is arranged at the end of the sealing plate (10), and a connecting assembly (11) is welded to the top of the support frame (1); The outer wall of the cylinder (13) is welded with a feed pipe (12) and a discharge hopper (15) which are connected to the inner cavity thereof. A detachable connecting pipe (24) is provided below the discharge hopper (15). A lifting cylinder (23) is coaxially provided in the connecting pipe (24). A circular groove (27) is provided at the top of the lifting cylinder (23). A rotating circular plate (28) which is in frictional contact with the lifting cylinder (23) is rotatably provided in the circular groove (27). An arc groove (31) is provided through the top of the rotating circular plate (28) and the bottom of the circular groove (27). A detachable fixed circular plate (30) is inserted into the inner wall of one end of the arc groove (31). A discharge hole (29) is provided through the top of the fixed circular plate (30). A discharge pipe (25) which is connected to the arc groove (31) is fixedly connected to the inner top of the lifting cylinder (23). A rotating shaft (32) is coaxially provided on the inner bottom of the circular groove (27) and is fixedly connected coaxially to the rotating circular plate (28). A control motor (33) is fixedly provided on the inner top of the lifting cylinder (23), and an output shaft of the control motor (33) is fixedly connected to the rotating shaft (32).

2. A spiral weighing scale according to claim 1, characterized in that: The top of the lifting cylinder (23) is a truncated cone-shaped structure, and an annular groove (26) is provided on the outer wall of the lifting cylinder (23) along the circumferential direction, and a rubber sheet (22) is laid in the annular groove (26).

3. A spiral weighing scale according to claim 1, characterized in that: The connection assembly (11) includes a horizontally arranged connection plate (41), four support seats (42) are welded to the top of the support frame (1), the support seats (42) are detachably connected to the connection plate (41), the upper end of the feed pipe (12) is provided with a detachably arranged canvas soft connection (43), the top of the connection plate (41) is provided with a feed port (40) extending therethrough, and the top of the connection plate (41) is provided with a plurality of positioning holes (39) uniformly distributed along the circumference of the feed port (40).

4. A spiral weighing scale according to claim 1, characterized in that: A U-shaped frame (19) is welded to the top of the support frame (1), and a U-shaped plate (21) is welded to the inner top of the U-shaped frame (19) and the upper outer wall of the cylinder (13). A load sensor (20) is provided between the two U-shaped plates (21), and the load sensor (20) is detachably connected to the two U-shaped plates (21) via studs and nuts.

5. A spiral weighing scale according to claim 1, characterized in that: The driving assembly (8) comprises a fixing frame (5) welded to the end of a sealing plate (10); a detachably arranged reducer (9) is provided on the top of the fixing frame (5); a detachably arranged driving motor (7) is provided at the end of the reducer (9); an output shaft of the driving motor (7) is connected to an input shaft of the reducer (9); one end of the auger shaft (17) passes through the sealing plate (10) and is connected to the output shaft of the reducer (9) via a coupling (6); and a speed sensor (18) for detecting the rotation speed of the auger shaft (17) is provided at the end of the sealing plate (10).

6. A spiral weighing scale according to claim 1, characterized in that: A horizontally arranged fixing plate (36) is fixedly provided in the connecting pipe (24), two electrically controlled telescopic cylinders (34) are fixedly provided on the top of the fixing plate (36), and output ends of the electrically controlled telescopic cylinders (34) are fixedly connected to the lifting cylinder (23).

7. A spiral weighing scale according to claim 6, characterized in that: The fixing plate (36) is fixedly connected to the connecting pipe (24) via a connecting rod (35).

8. A spiral weighing scale according to claim 1, characterized in that: The inner wall of the arc-shaped groove (31) is provided with a slot (38), the side wall of the fixed circular plate (30) is fixedly connected with an inserting plate (37), the inserting plate (37) is connected to the rotating circular plate (28) or the lifting cylinder (23) by means of screws, and the thickness of the fixed circular plate (30) is the same as the depth of the arc-shaped groove (31).

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