A trace element water-soluble fertilizer filling device

By designing a micronutrient water-soluble fertilizer filling device with clamping, sterilization, feeding, and discharging mechanisms, the problems of bacterial contamination and clumping during the filling process were solved, achieving an efficient and smooth filling process and improving the practicality of the equipment.

CN224427906UActive Publication Date: 2026-06-30SHANDONG RUNHUA FEDERAL AGRI TECH CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHANDONG RUNHUA FEDERAL AGRI TECH CO LTD
Filing Date
2025-06-17
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Traditional micronutrient water-soluble fertilizer filling equipment is prone to bacterial contamination and clumping during the filling process, leading to equipment blockage and affecting the equipment's usability.

Method used

A micronutrient water-soluble fertilizer filling device was designed, comprising a clamping mechanism, a sterilization mechanism, a feeding mechanism, a filling mechanism, and a discharge mechanism. The clamping mechanism holds the fertilizer tank, the sterilization mechanism sterilizes the fertilizer, the feeding mechanism breaks up clumps, the filling mechanism fills the fertilizer, and the discharge mechanism discharges the fertilizer, thus improving the practicality of the equipment.

Benefits of technology

It effectively removes bacteria from the micronutrient water-soluble fertilizer tank, breaks up clumps, ensures a smooth filling process, and improves the equipment's practicality and filling efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model relates to the technical field of micronutrient water-soluble fertilizer filling devices, and in particular to a micronutrient water-soluble fertilizer filling device. Its clamping mechanism clamps the micronutrient water-soluble fertilizer tank, a sterilization mechanism sterilizes the inside of the tank, a feeding mechanism breaks up any clumps of micronutrient water-soluble fertilizer, and the broken micronutrient water-soluble fertilizer is discharged into the filling mechanism. The filling mechanism then discharges the micronutrient water-soluble fertilizer into the micronutrient water-soluble fertilizer tank, improving the practicality of the equipment. The device includes a clamping mechanism, a sterilization mechanism, a feeding mechanism, a filling mechanism, a discharge mechanism, and a discharge mechanism. The sterilization mechanism is mounted on the clamping mechanism, the feeding mechanism is mounted on the filling mechanism (located to the left of the clamping mechanism), and the discharge mechanism is located at the rear of the clamping mechanism and mounted on the discharge mechanism.
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Description

Technical Field

[0001] This utility model relates to the technical field of micronutrient water-soluble fertilizer filling device, and in particular to a micronutrient water-soluble fertilizer filling device. Background Technology

[0002] Water-soluble fertilizer is a multi-element compound fertilizer that can be completely dissolved in water. It is easily absorbed by crops with high absorption and utilization rates, and can be used in facilities such as sprinkler and drip irrigation. The fertilizer contains trace elements such as boron, iron, zinc, copper, and molybdenum.

[0003] For example, the prior art represented by the micronutrient water-soluble fertilizer filling device disclosed in the utility model patent application number CN202220759268.3 mainly consists of a worktable, guide column, limiting plate, moving plate, filling pipe, threaded column, connecting column, support plate and motor, etc. The micronutrient water-soluble fertilizer filling is achieved through the cooperation of the worktable, guide column, limiting plate, moving plate, filling pipe, threaded column, connecting column, support plate and motor.

[0004] Traditional micronutrient water-soluble fertilizer filling devices may encounter bacteria inside the packaging tanks during the filling process, affecting the storage of the micronutrient water-soluble fertilizer. Furthermore, the micronutrient water-soluble fertilizer may clump together during filling, causing blockage of the discharge mechanism. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a clamping mechanism to clamp the trace element water-soluble fertilizer tank, a sterilization mechanism to sterilize the inside of the trace element water-soluble fertilizer tank, a feeding mechanism to break up the clumps of trace element water-soluble fertilizer, and the broken trace element water-soluble fertilizer to the filling mechanism. The filling mechanism is then activated to discharge the trace element water-soluble fertilizer into the trace element water-soluble fertilizer tank, thereby improving the practicality of the equipment. This is a trace element water-soluble fertilizer filling device.

[0006] This utility model discloses a filling device for water-soluble fertilizer containing trace elements, including a clamping mechanism; it also includes a sterilization mechanism, a feeding mechanism, a filling mechanism, a discharge mechanism, and a discharge mechanism. The sterilization mechanism is mounted on the clamping mechanism, the feeding mechanism is mounted on the filling mechanism, the filling mechanism is located on the left side of the clamping mechanism, and the discharge mechanism is located at the rear of the clamping mechanism and mounted on the discharge mechanism. The clamping mechanism clamps the water-soluble fertilizer tank containing trace elements. By activating the sterilization mechanism, the inside of the water-soluble fertilizer tank containing trace elements is sterilized. After sterilization, the clamping mechanism is activated to fill the water-soluble fertilizer tank containing trace elements. The system rotates the micronutrient water-soluble fertilizer tank to a position below the discharge port of the filling mechanism, discharging the micronutrient water-soluble fertilizer into the feeding mechanism. The feeding mechanism breaks up any clumps of micronutrient water-soluble fertilizer, which is then discharged into the filling mechanism. The filling mechanism discharges the micronutrient water-soluble fertilizer into the micronutrient water-soluble fertilizer tank. The filled micronutrient water-soluble fertilizer is then placed on the discharge mechanism, which is activated to limit its movement. Through the coordinated operation of the discharge mechanism and the discharge mechanism, the filled micronutrient water-soluble fertilizer is discharged, improving the practicality of the equipment.

[0007] Preferably, the clamping mechanism includes a first support, a rotating plate, a first motor, multiple first electric cylinders, and multiple electric clamps. The bottom end of the rotating plate is rotatably mounted on the top end of the first support. The first motor is mounted on the first support, and the bottom end of the rotating plate is connected to the output end of the first motor. The bottom ends of the multiple first electric cylinders are respectively mounted on the top end of the rotating plate, and the multiple electric clamps are respectively mounted on the upper part of the multiple first electric cylinders. The first support supports the rotating plate and the first motor. The multiple electric clamps clamp the trace element water-soluble fertilizer tank. The rotating plate is rotated by starting the first motor. The multiple electric clamps are raised and lowered by extending and retracting the multiple first electric cylinders, thereby improving the practicality of the equipment.

[0008] Preferably, the sterilization mechanism includes a bearing, a support frame, and 23. The outer ring of the bearing is fixedly installed on the top of the rotating plate, the lower part of the support frame is installed on the inner ring of the bearing, and 23 is installed on the upper part of the support frame. The bearing supports the support frame, and the support frame supports 23. Sterilization is carried out inside the trace element water-soluble fertilizer tank through 23, thereby improving the practicality of the equipment.

[0009] Preferably, the feeding mechanism includes a feed hopper, a crushing barrel, a discharge hopper, a second motor, a crushing shaft, and multiple crushing rods. The output end of the feed hopper is connected to the top of the crushing barrel, and the input end of the discharge hopper is connected to the bottom of the crushing barrel. A valve is installed on the output end of the discharge hopper. The second motor is installed at the top of the crushing barrel, and the top of the crushing shaft is installed at the output end of the second motor. Multiple crushing rods are installed on the crushing shaft, which is located inside the crushing barrel. The micronutrient water-soluble fertilizer is discharged into the crushing barrel through the feed hopper. By starting the second motor, the crushing shaft is rotated, and the agglomerated micronutrient water-soluble fertilizer is crushed by the multiple crushing rods. The crushed micronutrient water-soluble fertilizer is discharged into the filling mechanism through the discharge hopper, improving the practicality of the equipment.

[0010] Preferably, the filling mechanism includes a second support, a third motor, a rotating shaft, spiral blades, a discharge pipe, and a discharge tube. The third motor is installed at the top of the second support, and the left end of the rotating shaft is connected to the output end of the third motor. Spiral blades are provided on the rotating shaft, which is located inside the discharge pipe. The discharge pipe is installed at the top of the second support, and the input end of the discharge tube is connected to the output end of the discharge pipe. The second support supports the third motor and the spiral blades. By starting the third motor, the rotating shaft rotates, and the spiral blades discharge the trace element water-soluble fertilizer in the discharge pipe into the trace element water-soluble fertilizer tank through the discharge tube, thereby improving the practicality of the equipment.

[0011] Preferably, the discharge mechanism includes multiple support columns, a reducer, multiple fourth motors, and a discharge shaft. The reducer is installed on the top of the multiple support columns, and the multiple fourth motors are respectively installed on the multiple output ends of the reducer. The output end of the discharge shaft is connected to the input end of the reducer. The multiple support columns support the reducer. By starting the discharge shaft, the multiple fourth motors are rotated through the reducer. The multiple fourth motors discharge the filled trace element water-soluble fertilizer, thereby improving the practicality of the equipment.

[0012] Preferably, the discharge mechanism includes two sets of mounting plates, multiple second electric cylinders, and two sets of limiting plates. The bottom ends of the two sets of mounting plates are respectively mounted on the top of the reducer, the fixed ends of the multiple second electric cylinders are respectively mounted on the two sets of mounting plates, and the two sets of limiting plates are respectively mounted on the moving ends of the multiple second electric cylinders. The two sets of mounting plates support the multiple second electric cylinders respectively. By extending the multiple second electric cylinders respectively, the filling of trace element water-soluble fertilizer is limited by the two sets of limiting plates, thereby improving the practicality of the equipment.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: The clamping mechanism clamps the trace element water-soluble fertilizer tank, and the sterilization mechanism sterilizes the inside of the trace element water-soluble fertilizer tank. After sterilization, the clamping mechanism rotates the trace element water-soluble fertilizer tank to a position below the outlet of the filling mechanism, and the trace element water-soluble fertilizer is discharged into the feeding mechanism. The feeding mechanism breaks up the clumps of trace element water-soluble fertilizer, and the broken trace element water-soluble fertilizer is discharged into the filling mechanism. The filling mechanism discharges the trace element water-soluble fertilizer into the trace element water-soluble fertilizer tank. The filled trace element water-soluble fertilizer is placed on the discharge mechanism and limited by the discharge mechanism. The discharged trace element water-soluble fertilizer is discharged through the cooperation of the discharge mechanism and the discharge mechanism, thereby improving the practicality of the equipment. Attached Figure Description

[0014] Figure 1 This is an isometric schematic diagram of this utility model;

[0015] Figure 2 This is a front view of the clamping mechanism of this utility model;

[0016] Figure 3 This is an isometric schematic diagram of the sterilization mechanism of this utility model;

[0017] Figure 4 This is a front sectional view of the feeding mechanism of this utility model;

[0018] Figure 5 This is a front sectional view of the filling mechanism of this utility model;

[0019] Figure 6 This is an isometric schematic diagram of the discharge mechanism of this utility model;

[0020] Figure 7 This is an isometric schematic diagram of the limiting mechanism of this utility model.

[0021] The attached diagram is labeled as follows: 01, clamping mechanism; 11, first support; 12, rotating plate; 13, first motor; 14, first electric cylinder; 15, electric clamp; 02, sterilization mechanism; 21, bearing; 22, support frame; 23, ultraviolet lamp; 03, feeding mechanism; 31, feed hopper; 32, crushing barrel; 33, discharge hopper; 34, second motor; 35, crushing shaft; 36, crushing rod; 04, filling mechanism; 41, second support; 42, third motor; 43, rotating shaft; 44, spiral blade; 45, discharge pipe; 46, discharge pipe; 05, discharge mechanism; 51, support column; 52, reducer; 53, fourth motor; 54, discharge shaft; 06, limiting mechanism; 61, mounting plate; 62, second electric cylinder; 63, limiting plate. Detailed Implementation

[0022] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete. Example

[0023] like Figure 1 As shown, a filling device for water-soluble fertilizers containing trace elements includes a clamping mechanism 01; it also includes a sterilization mechanism 02, a feeding mechanism 03, a filling mechanism 04, a discharge mechanism 05, and a discharge mechanism 06. The sterilization mechanism 02 is mounted on the clamping mechanism 01, the feeding mechanism 03 is mounted on the filling mechanism 04, the filling mechanism 04 is located on the left side of the clamping mechanism 01, the discharge mechanism 05 is located at the rear of the clamping mechanism 01, and the discharge mechanism 06 is mounted on the discharge mechanism 05.

[0024] The clamping mechanism 01 clamps the micronutrient water-soluble fertilizer tank. The sterilization mechanism 02 is activated to sterilize the inside of the micronutrient water-soluble fertilizer tank. After sterilization, the clamping mechanism 01 is activated to rotate the micronutrient water-soluble fertilizer tank to a position below the outlet of the filling mechanism 04. The micronutrient water-soluble fertilizer is then discharged into the feeding mechanism 03. The feeding mechanism 03 breaks up any clumps of micronutrient water-soluble fertilizer. The broken micronutrient water-soluble fertilizer is discharged into the filling mechanism 04. The filling mechanism 04 is activated to discharge the micronutrient water-soluble fertilizer into the micronutrient water-soluble fertilizer tank. The filled micronutrient water-soluble fertilizer is placed on the discharge mechanism 05 and limited by the discharge mechanism 06. The discharge mechanism 05 and the discharge mechanism 06 work together to discharge the filled micronutrient water-soluble fertilizer, improving the practicality of the equipment.

[0025] like Figure 2 As shown, the clamping mechanism 01 includes a first bracket 11, a rotating plate 12, a first motor 13, a plurality of first electric cylinders 14 and a plurality of electric clamps 15. The bottom end of the rotating plate 12 is rotatably mounted on the top end of the first bracket 11. The first motor 13 is mounted on the first bracket 11. The bottom end of the rotating plate 12 is connected to the output end of the first motor 13. The bottom ends of the plurality of first electric cylinders 14 are respectively mounted on the top end of the rotating plate 12. The plurality of electric clamps 15 are respectively mounted on the upper part of the plurality of first electric cylinders 14.

[0026] like Figure 3 As shown, the sterilization mechanism 02 includes a bearing 21, a support frame 22 and 23. The outer ring of the bearing 21 is fixedly installed on the top of the rotating plate 12, the lower part of the support frame 22 is installed on the inner ring of the bearing 21, and the upper part of the support frame 22 is installed on the upper part of the support frame 22.

[0027] The first support 11 supports the rotating plate 12 and the first motor 13. Multiple electric clamps 15 clamp the micronutrient water-soluble fertilizer tank. The rotating plate 12 is rotated by starting the first motor 13. Multiple electric cylinders 14 are extended and retracted to raise and lower the multiple electric clamps 15 respectively. The bearing 21 supports the support frame 22. The support frame 22 supports 23. Sterilization is performed inside the micronutrient water-soluble fertilizer tank by 23, improving the practicality of the equipment. Example

[0028] like Figure 4 and Figure 5 As shown, based on Embodiment 1, it also includes a feeding mechanism 03 and a filling mechanism 04. The feeding mechanism 03 includes a feed hopper 31, a crushing barrel 32, a discharge hopper 33, a second motor 34, a crushing shaft 35, and multiple crushing rods 36. The output end of the feed hopper 31 is connected to the top of the crushing barrel 32, and the input end of the discharge hopper 33 is connected to the bottom of the crushing barrel 32. A valve is provided on the output end of the discharge hopper 33. The second motor 34 is installed at the top of the crushing barrel 32, and the top of the crushing shaft 35 is installed on the output end of the second motor 34. A valve is provided on the crushing shaft 35. Multiple crushing rods 36, and a crushing shaft 35 located inside the crushing barrel 32; the filling mechanism 04 includes a second support 41, a third motor 42, a rotating shaft 43, a spiral blade 44, a discharge pipe 45, and a discharge pipe 46. The third motor 42 is installed at the top of the second support 41, the left end of the rotating shaft 43 is connected to the output end of the third motor 42, the rotating shaft 43 is provided with a spiral blade 44, the rotating shaft 43 is located inside the discharge pipe 45, the discharge pipe 45 is installed at the top of the second support 41, and the input end of the discharge pipe 46 is connected to the output end of the discharge pipe 45.

[0029] Micronutrient water-soluble fertilizer is discharged into crushing barrel 32 through feeding hopper 31. The crushing shaft 35 is rotated by starting the second motor 34, and the agglomerated micronutrient water-soluble fertilizer is crushed by multiple crushing rods 36. The crushed micronutrient water-soluble fertilizer is discharged into filling mechanism 04 through discharge hopper 33. The second support 41 supports the third motor 42 and spiral blades 445. The rotating shaft 43 is rotated by starting the third motor 42, and the micronutrient water-soluble fertilizer in discharge pipe 45 is discharged into micronutrient water-soluble fertilizer tank through discharge pipe 46 by spiral blades 44, improving the practicality of the equipment. Example

[0030] like Figure 6 and Figure 7As shown, based on Embodiment 1, it also includes a discharge mechanism 05 and a discharge mechanism 06. The discharge mechanism 05 includes multiple support columns 51, a reducer 52, multiple fourth motors 53, and a discharge shaft 54. The reducer 52 is installed on the top of the multiple support columns 51, and the multiple fourth motors 53 are respectively installed on the multiple output ends of the reducer 52. The output end of the discharge shaft 54 ​​is connected to the input end of the reducer 52. The discharge mechanism 06 includes two sets of mounting plates 61, multiple second electric cylinders 62, and two sets of limiting plates 63. The bottom ends of the two sets of mounting plates 61 are respectively installed on the top of the reducer 52, the fixed ends of the multiple second electric cylinders 62 are respectively installed on the two sets of mounting plates 61, and the two sets of limiting plates 63 are respectively installed on the moving ends of the multiple second electric cylinders 62.

[0031] Multiple support columns 51 support the reducer 52. By starting the discharge shaft 54, the reducer 52 drives multiple fourth motors 53 to rotate. The multiple fourth motors 53 discharge the filled trace element water-soluble fertilizer. Two sets of mounting plates 61 support multiple second electric cylinders 62. By extending the multiple second electric cylinders 62, the filled trace element water-soluble fertilizer is limited by two sets of limiting plates 63, thereby improving the practicality of the equipment.

[0032] like Figures 1 to 7 As shown, this utility model discloses a filling device for trace element water-soluble fertilizer. During operation, the first support 11 supports the rotating plate 12 and the first motor 13. Multiple electric clamps 15 clamp the trace element water-soluble fertilizer container. The rotating plate 12 rotates by starting the first motor 13. Multiple electric cylinders 14 extend and retract to raise and lower the electric clamps 15. Then, the bearing 21 supports the support frame 22, which in turn supports 23. 23 sterilizes the contents of the trace element water-soluble fertilizer container. Afterward, the trace element water-soluble fertilizer is discharged through the feed hopper 31 into the crushing barrel 32. The crushing shaft 35 rotates by starting the second motor 34, and multiple crushing rods 36 crush the agglomerated trace element water-soluble fertilizer. The crushed trace elements... Water-soluble fertilizer is discharged into the filling mechanism 04 via the discharge hopper 33. Then, the second support 41 supports the third motor 42 and the spiral blade 445. By starting the third motor 42, the rotating shaft 43 is rotated, and the trace element water-soluble fertilizer in the discharge pipe 45 is discharged into the trace element water-soluble fertilizer tank via the discharge pipe 46 through the spiral blade 44. Afterward, multiple support columns 51 support the reducer 52 respectively. By starting the discharge shaft 54, multiple fourth motors 53 are rotated through the reducer 52. The filled trace element water-soluble fertilizer is discharged through the multiple fourth motors 53. Finally, two sets of mounting plates 61 support multiple second electric cylinders 62 respectively. By extending the multiple second electric cylinders 62 respectively, the filled trace element water-soluble fertilizer is limited by two sets of limit plates 63, improving the practicality of the equipment.

[0033] The first motor 13, 23, the second motor 34, the third motor 42, the reducer 52, and the fourth motor 53 of this utility model are commercially available. Technical personnel in this industry only need to install and operate them according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0034] The main functions achieved by this utility model are as follows: the clamping mechanism 01 clamps the trace element water-soluble fertilizer tank, the sterilization mechanism 02 sterilizes the inside of the trace element water-soluble fertilizer tank, the feeding mechanism 03 breaks up the clumped trace element water-soluble fertilizer, the broken trace element water-soluble fertilizer is discharged into the filling mechanism 04, and the filling mechanism 04 discharges the trace element water-soluble fertilizer into the trace element water-soluble fertilizer tank, thereby improving the practicality of the equipment.

[0035] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A filling device for water-soluble fertilizers containing trace elements, comprising a clamping mechanism (01); characterized in that, It also includes a sterilization mechanism (02), a feeding mechanism (03), a filling mechanism (04), a discharge mechanism (05), and a discharge mechanism (06). The sterilization mechanism (02) is installed on the clamping mechanism (01), the feeding mechanism (03) is installed on the filling mechanism (04), the filling mechanism (04) is located on the left side of the clamping mechanism (01), the discharge mechanism (05) is located at the rear of the clamping mechanism (01), and the discharge mechanism (06) is installed on the discharge mechanism (05).

2. The filling device for water-soluble fertilizers containing trace elements as described in claim 1, characterized in that, The clamping mechanism (01) includes a first bracket (11), a rotating plate (12), a first motor (13), multiple first electric cylinders (14) and multiple electric clamps (15). The bottom end of the rotating plate (12) is rotatably mounted on the top end of the first bracket (11). The first motor (13) is mounted on the first bracket (11). The bottom end of the rotating plate (12) is connected to the output end of the first motor (13). The bottom ends of the multiple first electric cylinders (14) are respectively mounted on the top end of the rotating plate (12). The multiple electric clamps (15) are respectively mounted on the upper part of the multiple first electric cylinders (14).

3. The filling device for water-soluble fertilizers containing trace elements as described in claim 1, characterized in that, The sterilization mechanism (02) includes a bearing (21), a support frame (22) and a 23. The outer ring of the bearing (21) is fixedly installed on the top of the rotating plate (12), the lower part of the support frame (22) is installed on the inner ring of the bearing (21), and the 23 is installed on the upper part of the support frame (22).

4. The filling device for water-soluble fertilizers containing trace elements as described in claim 1, characterized in that, The feeding mechanism (03) includes a feed hopper (31), a crushing barrel (32), a discharge hopper (33), a second motor (34), a crushing shaft (35), and multiple crushing rods (36). The output end of the feed hopper (31) is connected to the top of the crushing barrel (32), and the input end of the discharge hopper (33) is connected to the bottom of the crushing barrel (32). A valve is provided on the output end of the discharge hopper (33). The second motor (34) is installed on the top of the crushing barrel (32), and the top of the crushing shaft (35) is installed on the output end of the second motor (34). Multiple crushing rods (36) are provided on the crushing shaft (35), and the crushing shaft (35) is located inside the crushing barrel (32).

5. A filling device for water-soluble fertilizers containing trace elements as described in claim 1, characterized in that, The filling mechanism (04) includes a second support (41), a third motor (42), a rotating shaft (43), a spiral blade (44), a discharge pipe (45), and a discharge pipe (46). The third motor (42) is installed at the top of the second support (41). The left end of the rotating shaft (43) is connected to the output end of the third motor (42). The rotating shaft (43) is provided with a spiral blade (44). The rotating shaft (43) is located inside the discharge pipe (45). The discharge pipe (45) is installed at the top of the second support (41). The input end of the discharge pipe (46) is connected to the output end of the discharge pipe (45).

6. The filling device for water-soluble fertilizers containing trace elements as described in claim 1, characterized in that, The discharge mechanism (05) includes multiple support columns (51), a reducer (52), multiple fourth motors (53) and a discharge shaft (54). The reducer (52) is installed on the top of the multiple support columns (51), and the multiple fourth motors (53) are respectively installed on the multiple output ends of the reducer (52). The output end of the discharge shaft (54) is connected to the input end of the reducer (52).

7. A filling device for water-soluble fertilizers containing trace elements as described in claim 6, characterized in that, The discharge mechanism (06) includes two sets of mounting plates (61), multiple second electric cylinders (62) and two sets of limiting plates (63). The bottom ends of the two sets of mounting plates (61) are respectively mounted on the top of the reducer (52). The fixed ends of the multiple second electric cylinders (62) are respectively mounted on the two sets of mounting plates (61). The two sets of limiting plates (63) are respectively mounted on the moving ends of the multiple second electric cylinders (62).