Adjustable riding tea picking and pruning integrated machine

By designing an adjustable tea-picking and pruning integrated machine, electric push rods and motor-driven comb and cutting teeth are used to achieve simultaneous tea picking and pruning, solving the problem of messy tea branches caused by the inability of traditional tea-picking machines to prune old tea branches, and improving the efficiency of tea garden management.

CN224290760UActive Publication Date: 2026-05-29ZHEJIANG XINYUAN INTELLIGENT EQUIP GRP CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
ZHEJIANG XINYUAN INTELLIGENT EQUIP GRP CO LTD
Filing Date
2025-06-13
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Traditional tea-picking machines cannot prune old tea branches during the picking process, resulting in messy and uneven tea tree branches, which affects the growth of tea trees.

Method used

Design an adjustable riding tea picking and pruning integrated machine, including a frame, a stabilizing frame, drive wheels, an electric push rod, a collection cylinder, tracks, a geared motor, transmission wheels, and a tea picking and pruning mechanism. The height and angle of the collection cylinder can be adjusted by the electric push rod, and combined with the comb teeth and cutting teeth driven by the motor, the tea picking and pruning can be carried out simultaneously.

Benefits of technology

It achieves efficient integrated operation of tea picking and pruning, improves work efficiency, reduces the time spent on process connections, and is suitable for large-scale tea garden management.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model discloses an adjustable tea-picking and pruning integrated machine, comprising: two sets of frames, a stabilizing frame fixedly installed on the upper surface between the two sets of frames, a seat fixedly installed inside the stabilizing frame, multiple sets of drive wheels rotatably installed at one end of each set of frames, and tracks fitted onto the outer surface of the multiple sets of drive wheels; a collecting cylinder rotatably installed at one end of the stabilizing frame, and a tea-picking and pruning mechanism rotatably installed inside the collecting cylinder. This application, through the design of the tea-picking and pruning mechanism, achieves highly efficient integrated picking and pruning operations during the picking process through the coordinated cooperation of the rotation of the comb teeth and the reciprocating shearing of the second cutting teeth. Compared with traditional manual step-by-step operations or single-function equipment, it significantly improves work efficiency and reduces the time spent on process connections, making it particularly suitable for large-scale tea garden management.
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Description

Technical Field

[0001] This utility model relates to the technical field of tea picking equipment, specifically an adjustable riding tea picking and pruning integrated machine. Background Technology

[0002] Traditional tea picking methods are all done by hand, which is labor-intensive and inefficient. Therefore, mechanized tea picking machines have been gradually promoted in recent years. These machines are mainly powered by electric motors or fuel engines, which drive a pair of toothed blades to perform a shearing motion, cutting the tea leaves that have entered the blades.

[0003] For example, the national authorized patent announcement number CN203206755U discloses an energy-saving tea-picking machine. The technical problem to be solved is that the provided tea-picking machine should have the characteristics of high working efficiency, no energy consumption, and low labor intensity. The technical solution is: an energy-saving tea-picking machine, including a gantry frame, a pair of toothed blades that can be relatively slidably positioned on the frame to cut tea leaves, a prying blade that continuously pushes the tender leaves to be cut toward the toothed blades, and a speed-changing mechanism that drives the toothed blades and the prying blade; the characteristic feature is that the tea-picking machine is also equipped with four wheels that support the weight of the entire tea-picking machine and generate power when rotating, and the speed-changing mechanism and the four wheels form a transmission chain to obtain power.

[0004] However, the aforementioned energy-saving tea-picking machines cannot prune old tea branches during the tea-picking process. Unpruned tea branches will extend disorderly in all directions during subsequent growth, forming an overly dense layer of branches, affecting the ventilation and light penetration of the canopy, and thus inhibiting the germination and growth of new buds. This will cause the tea trees to grow naturally, resulting in messy and uneven branches. Utility Model Content

[0005] The purpose of this utility model is to provide an adjustable riding tea picking and pruning integrated machine to solve the problem mentioned in the background art that the old tea branches cannot be pruned at the same time during the tea picking process, which leads to messy and uneven branches due to the natural growth of tea trees.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An adjustable tea picking and pruning integrated machine includes: two sets of frames, a stabilizing frame fixedly installed on the upper surface between the two sets of frames, a seat fixedly installed inside the stabilizing frame, multiple sets of drive wheels rotatably installed at one end of each of the two sets of frames, tracks fitted on the outer surface of the multiple sets of drive wheels, a collecting cylinder rotatably installed at one end of the stabilizing frame, and a tea picking and pruning mechanism rotatably installed inside the collecting cylinder.

[0008] Preferably, two sets of geared motors are fixedly installed on the lower surface of the stabilizing frame. One end of the output shaft of each set of geared motors is fixedly installed with a first transmission wheel. A synchronous belt is fitted on the outer surface of the first transmission wheel. The other end of the synchronous belt is fitted on the outer surface of the second transmission wheel. The second transmission wheel is fixedly connected to one of the drive wheels.

[0009] Preferably, an electric push rod is rotatably mounted on the lower surface of the stabilizing frame, the piston rod of the electric push rod is rotatably mounted on one end of the outer surface of the collecting cylinder, and a closing cover is rotatably mounted on the lower end of the outer surface of the collecting cylinder.

[0010] Preferably, the tea picking and pruning mechanism includes two sets of turntables, with comb teeth fixedly installed between the two sets of turntables. One end of each turntable is fixedly connected to the output shaft of a first motor, and the first motor is fixedly installed at one end of a collection cylinder. This allows the comb teeth to be driven to rotate by the first motor to pick the tea leaves into the collection cylinder. The spacing between the comb teeth decreases from large to small.

[0011] Preferably, threaded rods are fixedly installed at both ends of the collecting cylinder, and connecting plates are rotatably installed on the outer surfaces of both sets of threaded rods. A first cutting tooth is fixedly installed between the two sets of connecting plates, so that the first cutting tooth can be adjusted in angle by rotating on the outer surface of the threaded rod through the connecting plate.

[0012] Preferably, both sets of threaded rods have wing nuts threaded onto their outer surfaces, and the wing nuts can be threaded onto one end of the connecting plate to lock the rotation of the connecting plate.

[0013] Preferably, a guide rail is fixedly installed between the two sets of connecting plates, a guide tube is slidably installed on the outer surface of the guide rail, and a second cutting tooth is fixedly installed at one end of the outer surface of the guide tube, the second cutting tooth slidingly abutting the upper surface of the first cutting tooth.

[0014] Preferably, a connecting arm is rotatably mounted on one end of the outer surface of the guide tube, and the other end of the connecting arm is rotatably mounted on the lower surface of the eccentric shaft. The eccentric shaft is fixedly mounted on the lower surface of the output shaft of the second motor, and the second motor is fixedly mounted on the upper surface of the mounting box. The mounting box is fixedly mounted on one end of one set of connecting plates, thereby allowing the eccentric shaft to rotate within the mounting box.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. Through the design of the frame, stabilizer, drive wheel, electric push rod, collection cylinder, track, geared motor, first transmission wheel, second transmission wheel, synchronous belt, and tea picking and pruning mechanism, during tea picking, workers can activate the electric push rod to push or pull the collection cylinder according to the height of the tea tree. This allows for the adjustment of the height and angle of the collection cylinder, enabling the collection cylinder to drive the internally driven tea picking and pruning mechanism to approach the tea tree canopy. Once the collection cylinder is positioned, the height of the pruning end of the tea picking and pruning mechanism shaft can be adjusted, allowing for the pruning of older tea branches at the adjusted position during picking. Subsequently, the geared motor is activated to drive the first transmission wheel to rotate, and the power is transmitted to the second transmission wheel via the synchronous belt, thereby driving the drive wheel to rotate. This allows the drive wheels to drive the tracks, enabling the machine to move smoothly through the tea garden. Simultaneously, the power source in the tea picking and pruning mechanism starts, causing the internal picking components, such as the comb teeth, to rotate at high speed, combing and rolling the tea buds into the collection cylinder. The pruning components also begin to work, precisely pruning the tea trees at the adjusted position, causing the pruned tea branches to fall to the ground, where the tea leaves are collected. Once a certain amount of tea leaves have been collected, the lower cover on the outer surface can be opened to guide the tea leaves to the collection device. Throughout the entire operation, the real-time adjustment of the electric push rod, combined with the stable operation of the tea picking and pruning mechanism, ensures that the integrated machine can adapt to tea picking and pruning work in tea gardens of different heights and terrains, efficiently completing the integrated picking and pruning task.

[0017] 2. Through the design of a turntable, a first motor, comb teeth, threaded rod, connecting plate, wing nut, first cutting tooth, guide rail, second cutting tooth, guide rail tube, connecting arm, second motor, and eccentric shaft, the first and second motors can be started simultaneously during tea picking. The first motor drives the turntable, allowing the comb teeth to comb into the canopy of the tea tree and pull it as it rotates, thus cutting the canopy within the gradually decreasing spacing of the comb teeth. At the same time, the second motor drives the eccentric shaft to rotate, and the eccentric shaft drives the guide rail tube to reciprocate linearly along the guide rail through the connecting arm. This causes the second cutting tooth, fixed on the guide rail tube, to slide synchronously back and forth on the upper surface of the first cutting tooth, forming a shearing action similar to scissors. This allows for a second, precise pruning of the tea tree branches that have been cut by the comb teeth. Previously, operators could pre-adjust the tilt angles of the first and second cutting teeth by rotating the connecting plate according to the tea tree variety and pruning requirements, determining the shape of the pruning surface, such as horizontal or arc-shaped. Then, the angle was locked by tightening the wing nut to ensure consistent pruning height. The tea leaves cut by the comb teeth would naturally fall into the collection cylinder under the action of centrifugal force and airflow, and finally be discharged through the closed cover at the bottom. Throughout the process, the rotation speed of the comb teeth and the speed of the machine traveled in coordination, which not only ensured the efficiency of tea picking, but also avoided the situation of tearing branches or incomplete cutting due to excessive speed. This achieved efficient integrated operation of picking and pruning. Compared with traditional manual step-by-step operation or single-function equipment, it greatly improved the efficiency of operation and reduced the time spent on process connection, which is especially suitable for large-scale tea garden management. Attached Figure Description

[0018] Figure 1 This is a top view of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the overall bottom view of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the turntable and comb teeth of this utility model;

[0021] Figure 4 This is a schematic diagram of the threaded rod and connecting plate of this utility model;

[0022] Figure 5 This is a schematic diagram of the tea picking and pruning mechanism of this utility model.

[0023] In the diagram: 1. Frame; 101. Stabilizer; 102. Seat; 103. Drive wheel; 104. Electric push rod; 105. Collection cylinder; 106. Track; 107. Gear motor; 108. First transmission wheel; 109. Second transmission wheel; 110. Cover; 111. Synchronous belt; 2. Tea picking and pruning mechanism; 201. Turntable; 202. First motor; 203. Comb teeth; 204. Threaded rod; 205. Connecting plate; 206. Wing nut; 207. First cutting tooth; 208. Guide rail; 209. Second cutting tooth; 210. Guide rail tube; 211. Connecting arm; 212. Second motor; 213. Eccentric shaft; 214. Mounting box. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-5 This embodiment provides the following technical solution:

[0026] like Figures 1-2 As shown, an adjustable tea picking and pruning integrated machine includes: two sets of frames 1, a stabilizing frame 101 fixedly installed on the upper surface between the two sets of frames 1, a seat 102 fixedly installed inside the stabilizing frame 101, multiple sets of drive wheels 103 rotatably installed at one end of each set of frames 1, tracks 106 fitted on the outer surface of the multiple sets of drive wheels 103, a collection cylinder 105 rotatably installed at one end of the stabilizing frame 101, and a tea picking and pruning mechanism 2 rotatably installed inside the collection cylinder 105.

[0027] Two sets of geared motors 107 are fixedly mounted on the lower surface of the stabilizing frame 101. A first transmission wheel 108 is fixedly mounted on one end of the output shaft of each of the two sets of geared motors 107. A synchronous belt 111 is fitted onto the outer surface of the first transmission wheel 108, and the other end of the synchronous belt 111 is fitted onto the outer surface of a second transmission wheel 109. The second transmission wheel 109 is fixedly connected to one of the drive wheels 103. An electric push rod 104 is rotatably mounted on the lower surface of the stabilizing frame 101. The piston rod of the electric push rod 104 is rotatably mounted on one end of the outer surface of the collecting cylinder 105. A closing cover 110 is rotatably mounted on the lower end of the outer surface of the collecting cylinder 105.

[0028] Through the design of the frame 1, stabilizing frame 101, drive wheel 103, electric push rod 104, collecting cylinder 105, track 106, reduction motor 107, first transmission wheel 108, second transmission wheel 109, synchronous belt 111, and tea picking and pruning mechanism 2, when picking tea, the worker can activate the electric push rod 104 to push or pull the collecting cylinder 105 according to the height of the tea tree, thereby realizing the operation of adjusting the height and angle of the collecting cylinder 105. This allows the collecting cylinder 105 to drive the internally driven tea picking and pruning mechanism 2 to approach the tea tree canopy. Once the position of the collecting cylinder 105 is determined, the height of the pruning end of the tea picking and pruning mechanism 2 shaft can be adjusted, allowing it to prune the old tea branches at the adjusted position while picking. Then, the reduction motor 107 can be activated to drive the first transmission wheel 108 to rotate, and the power is transmitted to the second transmission wheel 109 through the synchronous belt 111. The drive wheel 109 drives the drive wheel 103 to rotate, which in turn drives the track 106 to move the whole machine smoothly in the tea garden. At the same time, the power source in the tea picking and pruning mechanism 2 starts, driving the internal comb teeth 203 and other picking components to rotate at high speed, combing and rolling the tea tree buds into the collection cylinder 105. The pruning components also start working, precisely pruning the tea trees at the adjusted position, causing the pruned tea branches to fall to the ground, and the tea leaves are collected by the collection cylinder 105. After a certain amount of tea leaves are collected, the cover 110 at the lower end of the outer surface can be opened to guide the tea leaves to the collection device. During the entire operation, the real-time adjustment of the electric push rod 104, combined with the stable operation of the tea picking and pruning mechanism 2, ensures that the integrated machine can adapt to tea picking and tea tree pruning work in tea gardens of different heights and terrains, and efficiently complete the integrated picking and pruning task.

[0029] like Figures 3-5As shown, the tea picking and pruning mechanism 2 includes two sets of turntables 201. A comb tooth 203 is fixedly installed between the two sets of turntables 201. One end of each turntable 201 is fixedly connected to the output shaft of a first motor 202, which is fixedly installed at one end of a collecting cylinder 105. This allows the comb tooth 203 to be rotated by the first motor 202, thus picking tea leaves into the collecting cylinder 105. The spacing between the comb teeth 203 decreases from large to small. Threaded rods 204 are fixedly installed at both ends of the collecting cylinder 105. Connecting plates 205 are rotatably installed on the outer surfaces of both sets of threaded rods 204. A first cutting tooth 207 is fixedly installed between the two sets of connecting plates 205, allowing the first cutting tooth 207 to be adjusted in angle by rotating on the outer surface of the threaded rod 204 via the connecting plates 205. Both sets of threaded rods 204 have wing nuts 206 threaded onto their outer surfaces. The wing nuts 206 can press against one end of the connecting plate 205 to lock the rotation of the connecting plate 205. A guide rail 208 is fixedly installed between the two sets of connecting plates 205. A guide tube 210 is slidably installed on the outer surface of the guide rail 208. A second cutting tooth 209 is fixedly installed on one end of the outer surface of the guide tube 210, and the second cutting tooth 209 slides against the upper surface of the first cutting tooth 207. A connecting arm 211 is rotatably installed on one end of the outer surface of the guide tube 210. The other end of the connecting arm 211 is rotatably installed on the lower surface of the eccentric shaft 213. The eccentric shaft 213 is fixedly installed on the lower surface of the output shaft of the second motor 212. The second motor 212 is fixedly installed on the upper surface of the mounting box 214. The mounting box 214 is fixedly installed on one end of one set of connecting plates 205, so that the eccentric shaft 213 rotates within the mounting box 214.

[0030] Through the design of the turntable 201, first motor 202, comb teeth 203, threaded rod 204, connecting plate 205, wing nut 206, first cutting tooth 207, guide rail 208, second cutting tooth 209, guide tube 210, connecting arm 211, second motor 212, and eccentric shaft 213, the first motor 202 and the second motor 212 can be started simultaneously during tea picking. The first motor 202 drives the turntable 201 to allow the comb teeth 203 to comb into the canopy of the tea tree and pull it as it rotates, so that the canopy can be cut within the gradually decreasing spacing of the comb teeth 203. At the same time, the second motor 212 drives the eccentric shaft 213 to rotate. The eccentric shaft 213 drives the guide tube 210 to reciprocate linearly along the guide rail 208 through the connecting arm 211, so that the second cutting tooth 209, which is fixed on the guide tube 210, slides synchronously on the upper surface of the first cutting tooth 207, forming a shearing motion similar to scissors. The machine performs a second, precise pruning of tea branches that have been cut by the comb teeth 203. Before this, the operator can adjust the tilt angle of the first cutting tooth 207 and the second cutting tooth 209 by rotating the connecting plate 205 according to the tea variety and pruning requirements, and determine the shape of the pruning surface, such as horizontal or arc. Then, the angle is locked by tightening the wing nut 206 to ensure that the pruning height is consistent. The tea leaves cut by the comb teeth 203 will fall naturally into the collection cylinder 105 under the action of centrifugal force and airflow, and finally be discharged through the lower closed cover 110. Throughout the process, the rotation speed of the comb teeth 203 and the machine's travel speed work together to ensure the efficiency of tea picking and avoid the situation of tearing or incomplete cutting of branches due to excessive speed. This achieves efficient integrated operation of picking and pruning. Compared with traditional manual step-by-step operation or single-function equipment, it greatly improves the efficiency of operation and reduces the time spent on process connection, which is especially suitable for large-scale tea garden management.

[0031] Based on the above technical solution, the working steps of this solution are summarized as follows: During tea picking, workers can activate the electric push rod 104 to push or pull the collection cylinder 105 according to the height of the tea tree, thereby adjusting the height and angle of the collection cylinder 105. This allows the collection cylinder 105 to drive the internally driven comb teeth 203 to approach the tea tree canopy. Once the position of the collection cylinder 105 is determined, the wing nut 206 can be loosened to rotate the connecting plate 205 and adjust the inclination angle of the first cutting tooth 207 and the second cutting tooth 209 to determine the shape of the pruning surface, such as horizontal or arc-shaped. Then, the wing nut 206 is tightened to lock the angle, ensuring consistent pruning height. Subsequently, the reduction motor 107 is activated to drive the first transmission wheel 108 to rotate, and the power is transmitted to the second transmission wheel 109 through the synchronous belt 111, thereby driving the drive wheel 103 to rotate. This allows the drive wheel 103 to drive the track 106, making the whole machine move smoothly in the tea garden. The first motor 202 and the second motor 212 can be started simultaneously. The first motor 202 drives the turntable 201 to comb the tea tree canopy with the comb teeth 203 and pull it as it rotates, so that the canopy can be cut within the gradually decreasing spacing of the comb teeth 203. At the same time, the second motor 212 drives the eccentric shaft 213 to rotate. The eccentric shaft 213 drives the guide tube 210 to reciprocate linearly along the guide rail 208 through the connecting arm 211, so that the second cutter fixed on the guide tube 210... The cutting teeth 209 slide synchronously back and forth on the upper surface of the first cutting teeth 207, forming a cutting action similar to scissors, and perform a second precise trimming on the tea branches that have been pulled and cut by the comb teeth 203. The tea branches that have been trimmed off can fall to the ground, and the tea leaves cut by the comb teeth 203 will fall naturally into the collection cylinder 105 under the action of centrifugal force and airflow for collection. After a certain amount of tea leaves have been collected, the closing cover 110 at the lower end of the outer surface can be opened to discharge the tea leaves out of the collection cylinder 105.

[0032] In summary, during the harvesting process, the coordinated operation of the rotation of the comb teeth 203 and the reciprocating shearing of the second cutting teeth 209 achieves efficient integrated harvesting and pruning. Compared with traditional manual step-by-step operations or single-function equipment, this significantly improves work efficiency and reduces the time spent on process connections, making it particularly suitable for large-scale tea garden management.

[0033] All parts not described in this utility model are the same as or can be implemented using existing technology. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable tea-picking and pruning integrated machine, characterized in that, include: Two sets of frames (1), a stabilizing frame (101) is fixedly installed on the upper surface between the two sets of frames (1), a seat (102) is fixedly installed inside the stabilizing frame (101), multiple sets of drive wheels (103) are rotatably installed at one end of each set of frames (1), and tracks (106) are fitted on the outer surface of the multiple sets of drive wheels (103). A collecting cylinder (105) is rotatably installed at one end of the stabilizing frame (101), and a tea picking and pruning mechanism (2) is rotatably installed inside the collecting cylinder (105).

2. The adjustable tea-picking and pruning integrated machine according to claim 1, characterized in that: Two sets of geared motors (107) are fixedly installed on the lower surface of the stabilizer (101). One end of the output shaft of each set of geared motors (107) is fixedly installed with a first transmission wheel (108). The outer surface of the first transmission wheel (108) is fitted with a synchronous belt (111). The other end of the synchronous belt (111) is fitted on the outer surface of the second transmission wheel (109). The second transmission wheel (109) is fixedly connected to one of the drive wheels (103).

3. The adjustable tea-picking and pruning integrated machine according to claim 1, characterized in that: An electric push rod (104) is rotatably mounted on the lower surface of the stabilizing frame (101). The piston rod of the electric push rod (104) is rotatably mounted on one end of the outer surface of the collecting cylinder (105). A closing cover (110) is rotatably mounted on the lower end of the outer surface of the collecting cylinder (105).

4. The adjustable tea-picking and pruning integrated machine according to claim 1, characterized in that: The tea picking and pruning mechanism (2) includes two sets of turntables (201), and comb teeth (203) are fixedly installed between the two sets of turntables (201). One end of the turntable (201) is fixedly connected to the output shaft of the first motor (202), and the first motor (202) is fixedly installed at one end of the collection tube (105). This allows the comb teeth (203) to be driven to rotate by the first motor (202) to pick tea leaves into the collection tube (105). The spacing between the comb teeth (203) is decreasing from large to small.

5. An adjustable tea-picking and pruning integrated machine according to claim 4, characterized in that: Both ends of the collecting cylinder (105) are fixedly installed with threaded rods (204). Connecting plates (205) are rotatably installed on the outer surfaces of the two sets of threaded rods (204). A first cutting tooth (207) is fixedly installed between the two sets of connecting plates (205), so that the first cutting tooth (207) can be rotated on the outer surface of the threaded rod (204) through the connecting plate (205) to achieve angle tilt adjustment.

6. An adjustable tea-picking and pruning integrated machine according to claim 5, characterized in that: Both sets of threaded rods (204) have wing nuts (206) threaded on their outer surfaces. The wing nuts (206) can be threaded against one end of the connecting plate (205) to lock the rotation of the connecting plate (205).

7. An adjustable tea-picking and pruning integrated machine according to claim 6, characterized in that: A guide rail (208) is fixedly installed between the two sets of connecting plates (205). A guide tube (210) is slidably installed on the outer surface of the guide rail (208). A second cutting tooth (209) is fixedly installed at one end of the outer surface of the guide tube (210). The second cutting tooth (209) slides against the upper surface of the first cutting tooth (207).

8. An adjustable tea-picking and pruning integrated machine according to claim 7, characterized in that: A connecting arm (211) is rotatably mounted on one end of the outer surface of the guide tube (210), and the other end of the connecting arm (211) is rotatably mounted on the lower surface of the eccentric shaft (213). The eccentric shaft (213) is fixedly mounted on the lower surface of the output shaft of the second motor (212), and the second motor (212) is fixedly mounted on the upper surface of the mounting box (214). The mounting box (214) is fixedly mounted on one end of one set of connecting plates (205), thereby allowing the eccentric shaft (213) to rotate within the mounting box (214).