Automatic conveyor for plant materials

The automatic conveyor system addresses energy waste and safety limitations by converting gravitational potential energy and using intelligent control for efficient and adaptable transportation of plant materials.

CN119160224AInactive Publication Date: 2024-12-20SHENZHEN ZHONGCHUANGMEILI BIOTECHNOLOGY CO LTD
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Patent Information

Application Number
CN202411419474.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-12
Publication Date
2024-12-20
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing monorail conveyors for plant materials in mountainous areas face energy waste due to the underutilization of gravitational potential energy, especially when going downhill, and require strict speed control to ensure safety, limiting flexibility and efficiency.

Method used

An automatic conveyor system that utilizes a power storage mechanism to convert gravitational potential energy into elastic potential energy, combined with a visual sensor and PLC controller for intelligent control, enabling efficient energy use and smooth navigation through curves.

Benefits of technology

The system effectively saves energy by storing and utilizing gravitational potential energy, enhances automation and stability, and adapts to varying track conditions, ensuring safe and efficient transportation.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of conveying equipment, in particular to an automatic conveyor for plant materials, which comprises a transport vehicle, the transport vehicle is driven by an engine or a motor, the transport vehicle comprises a bottom plate and a main body slidably arranged on the bottom plate, a visual sensor is fixedly arranged at the bottom of the bottom plate, and the automatic conveyor further comprises a walking wheel set. The main body is arranged at the bottom of the bottom plate, the power storage mechanism is arranged on one side of the walking wheel set, the transmission unit is arranged on the two sides of the back of the power storage mechanism, the main body is provided with a connecting assembly capable of being connected with the transmission unit, and then the transmission unit drives the main body to slide on the bottom plate. Gravitational potential energy is used for driving a power storage mechanism clockwork spring to store power during downhill, the gravitational potential energy is converted into elastic potential energy to be stored, energy can be released when needed subsequently, and energy consumption of an engine or a motor is effectively reduced.
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Description

Technical Field

[0001] The invention relates to the technical field of conveying equipment, in particular to an automatic conveyor for plant materials. Background Art

[0002] Plant materials, this term broadly covers various raw materials or materials derived from plants, and is also often used to refer to the fruits of plants. In orchard planting operations in mountainous and hilly areas, due to the rugged and complex mountain roads, there is often a lack of roads suitable for large vehicles. Therefore, monorail conveyors play a vital role as an efficient and flexible transportation tool.

[0003] In the daily operation of mountain monorail transport vehicles, when going uphill, the transport vehicle mainly relies on the strong traction provided by the engine or electric motor to overcome the challenges brought by gravity and ensure that the vehicle can move forward stably and continuously. When going downhill, the engine is still required to continue to provide a certain amount of power to ensure that the transport vehicle can descend smoothly and safely along the track.

[0004] It is worth noting that in order to ensure the smooth operation of the transport vehicle, the design of the track needs to maintain a certain slope, and due to the limitations of the terrain, there are often many bends on the track. In order to ensure transportation safety and prevent the risk of loss of control due to excessive speed, the speed of the transport vehicle is usually strictly controlled by a speed limiter. Although this design effectively ensures the safety of the transportation process, it also means that the gravitational potential energy when going downhill is not fully utilized, which causes energy waste to a certain extent. For this reason, we propose an automatic conveyor for plant materials. Summary of the invention

[0005] In order to solve the above technical problems, the embodiment of the present application provides an automatic conveyor for plant materials, including a transport vehicle, the transport vehicle is driven by an engine or a motor, the transport vehicle includes a bottom plate and a main body slidably arranged on the bottom plate, a visual sensor is fixedly arranged at the bottom of the bottom plate, and also includes;

[0006] The walking wheel set is arranged at the bottom of the base plate and cooperates with the track to drive the transport vehicle to move along the track;

[0007] The power storage mechanism is arranged on one side of the traveling wheel set and can be transmission-connected with the traveling wheel set;

[0008] The transmission unit is arranged on both sides of the back of the power storage mechanism and is transmission-connected with the power storage mechanism. The main body is provided with a connecting assembly that can be connected with the transmission unit, so that the transmission unit drives the main body to slide on the bottom plate.

[0009] In some embodiments, a fixed frame is provided at the bottom of the base plate, a mounting plate is fixedly provided on one side of the fixed frame, the walking wheel group includes a walking wheel 1 rotatably provided in the fixed frame, a rotating shaft is rotatably provided on the mounting plate, a walking wheel 2 is provided outside the rotating shaft, and the walking wheel 1 and the walking wheel 2 are respectively located on the upper and lower sides of the track.

[0010] In some embodiments, a bracket is fixedly provided on the mounting plate, and the force storage mechanism includes a driving shaft rotatably provided on the bracket, a fixed disk is fixedly provided on one end of the driving shaft, a clockwork spring is provided on the fixed disk, a connecting shaft is provided on the side of the fixed disk away from the driving shaft, both ends of the clockwork spring are fixedly connected to the fixed disk and the connecting shaft respectively, a connecting block is slidably provided on the rotating shaft, a slot is provided on the connecting shaft to engage with the connecting block, and positioning plates are provided on the outer sides of the driving shaft and the connecting shaft for limiting their own rotation.

[0011] In some embodiments, a sliding groove is provided in the rotating shaft for the connecting block to slide, an electromagnet is fixedly provided at the bottom of the sliding groove, a magnetic block is provided at the end of the connecting block, and when the electromagnet is energized, the magnetic block is repelled. A support spring is provided in the sliding groove, and both ends of the support spring are fixedly connected to the bottom of the sliding groove and the connecting block respectively.

[0012] In some embodiments, the bracket is fixedly provided with support rods on both sides of the fixed plate, a fixed sleeve is fixedly provided on the support rod, a sliding rod is slidably provided in the fixed sleeve, the positioning plate is fixedly provided at the end of the sliding rod, a magnetic block 2 and an electromagnet 2 are respectively provided at the bottom end of the sliding rod and in the fixed sleeve, when the electromagnet 2 is energized, it can attract the magnetic block 2, a connecting spring is provided in the fixed sleeve, and the two ends of the connecting spring are respectively fixedly connected to the sliding rod and the bottom of the fixed sleeve.

[0013] In some embodiments, a plurality of convex strips are fixedly disposed on the connecting shaft, the outer side of the driving shaft, and the inner side of the positioning plate.

[0014] In some embodiments, a mounting frame is fixedly provided on the bracket, and the transmission unit includes a transmission shaft rotatably provided on the mounting frame, a transmission gear and a transmission bevel gear are provided on the outer side of the transmission shaft, a driving bevel gear meshing with the transmission bevel gear is fixedly provided on the end of the driving shaft, and slide rails are fixedly provided on both sides of the mounting plate, and a rack meshing with the transmission gear is slidably provided in the slide rails.

[0015] In some embodiments, a sliding groove is provided on the bottom plate, a sliding frame is slidably arranged in the sliding groove, and the main body is fixedly connected to the sliding frame.

[0016] In some embodiments, the connecting assembly includes two electric push rods respectively fixed on both sides of the sliding frame, a pressure plate is provided at the end of the electric push rod, and a fixed plate is fixed on the top of the rack. When the pressure plate presses against the fixed plate, the rack can drive the sliding frame to move through the friction force between the pressure plate and the fixed plate when it moves.

[0017] In some embodiments, the opposing surfaces of the pressing plate and the fixing plate are configured to be serrated.

[0018] The present invention has at least the following beneficial effects:

[0019] 1. Efficient use of energy: By using the gravity potential energy to drive the power storage mechanism (spring) to store energy when going downhill, the gravity potential energy is converted into elastic potential energy and stored, which can be released when needed later, effectively saving the energy consumption of the engine or motor;

[0020] 2. Intelligent control and automation: The combination of PLC controller and visual sensor realizes the intelligent control of the transport vehicle. The visual sensor can detect the curve, and the PLC controller controls the actions of related components according to the detection results, such as the power on and off of the electromagnet, the extension and retraction of the electric push rod, etc., which improves the automation level of the transport vehicle;

[0021] 3. Smooth curves: When the transport vehicle reaches a curve, the electric push rod and the transmission unit cooperate to drive the main body to move in the opposite direction of the centrifugal force on the bottom plate, thereby effectively offsetting the centrifugal force generated when driving on the curve and ensuring the stability and safety of the transport vehicle;

[0022] 4. Strong adaptability: The transport vehicle can be adjusted and optimized according to different track conditions and transportation requirements, such as changing the connection state between the connecting block and the connecting shaft by adjusting the power-on state of the electromagnet, and controlling the moving direction and distance of the main body by the extension and retraction of the electric push rod, thereby improving the adaptability and flexibility of the transport vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 For the present invention Figure 1 Schematic diagram of local structure;

[0025] Figure 3 This is a schematic diagram of the structure of the traveling wheel set of the present invention;

[0026] Figure 4 For the present invention Figure 3 Another structural diagram;

[0027] Figure 5 For the present invention Figure 4Schematic diagram of local structure;

[0028] Figure 6 It is a schematic diagram of the structure of the power storage mechanism of the present invention;

[0029] Figure 7 This is a schematic diagram of the cross-sectional structure of the fixing sleeve of the present invention;

[0030] Figure 8 It is a structural schematic diagram of the transmission unit of the present invention.

[0031] In the figure: 1-bottom plate; 2-main body; 3-walking wheel group; 31-walking wheel 1; 32-rotating shaft; 33-walking wheel 2; 4-power storage mechanism; 41-driving shaft; 42-fixed plate; 43-spring spring; 44-connecting shaft; 45-connecting block; 5-transmission unit; 51-transmission shaft; 52-transmission gear; 53-transmission bevel gear; 54-driving bevel gear; 55-slide rail; 56-rack; 6-connection group Parts; 61-electric push rod; 62-pressing plate; 63-fixing plate; 7-fixing frame; 8-mounting plate; 9-bracket; 10-positioning plate; 11-slide groove; 12-electromagnet one; 13-magnet block one; 14-support spring; 15-support rod; 16-fixing sleeve; 17-slide rod; 18-magnet block two; 19-electromagnet two; 20-connecting spring; 21-convex strip; 22-mounting frame; 23-slide groove; 24-slide frame. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example 1: Please refer to Figure 1-Figure 8The present invention provides a technical solution: an automatic conveyor for plant materials, comprising a transport vehicle, which is driven by an engine or an electric motor. The transport vehicle comprises a base plate 1 and a main body 2 slidably arranged on the base plate 1. A visual sensor is fixedly arranged at the bottom of the base plate 1. A PLC controller is also arranged on the main body 2 to control the electronic equipment on the device. It also includes a walking wheel group 3 arranged at the bottom of the base plate 1, which can cooperate with the track to drive the transport vehicle to move along the track. A power storage mechanism 4 is arranged on one side of the walking wheel group 3, and the power storage mechanism 4 can be connected to the walking wheel group 3 in a transmission manner, so that when the walking wheel group 3 goes downhill along the track, it can drive the power storage mechanism 4 to store power, thereby converting the gravitational potential energy into elastic potential energy. Transmission units 5 are arranged on both sides of the back of the power storage mechanism 4, and the transmission unit 5 is connected to the power storage mechanism 4 in a transmission manner. A connecting component 6 that can be connected to the transmission unit 5 is arranged on the main body 2, so that the transmission unit 5 drives the main body 2 to slide on the base plate 1.

[0034] A fixed frame 7 is provided at the bottom of the base plate 1, and a mounting plate 8 is fixedly provided on one side of the fixed frame 7. The walking wheel group 3 includes a walking wheel 1 31 rotatably provided in the fixed frame 7, a rotating shaft 32 is rotatably provided on the mounting plate 8, and a walking wheel 2 33 is provided outside the rotating shaft 32. The walking wheel 1 31 and the walking wheel 2 33 are respectively located on the upper and lower sides of the track, and the two sandwich the track in the middle, thereby realizing the movement of the transport vehicle.

[0035] A bracket 9 is fixedly arranged on the mounting plate 8, and the power storage mechanism 4 includes a driving shaft 41 rotatably arranged on the bracket 9, a fixed disk 42 is fixedly arranged on one end of the driving shaft 41, a spring 43 is arranged on the fixed disk 42, a connecting shaft 44 is arranged on the side of the fixed disk 42 away from the driving shaft 41, and both ends of the spring 43 are fixedly connected to the fixed disk 42 and the connecting shaft 44 respectively, a connecting block 45 is slidably arranged on the rotating shaft 32, and a notch which is plugged into the connecting block 45 is opened on the connecting shaft 44, and positioning plates 10 for limiting their own rotation are arranged on the outer sides of the driving shaft 41 and the connecting shaft 44.

[0036] A slide groove 11 is provided in the rotating shaft 32 for the connection block 45 to slide. An electromagnet 12 is fixedly provided at the bottom of the slide groove 11. A magnetic block 13 is provided at the end of the connection block 45. When the electromagnet 12 is energized, the magnetic block 13 is repelled. A support spring 14 is provided in the slide groove 11. Both ends of the support spring 14 are fixedly connected to the bottom of the slide groove 11 and the connection block 45 respectively.

[0037] When going downhill, the controller controls the electromagnet 12 to be energized, thereby driving the magnetic block 13 to move, so that the magnetic block drives the connecting block 45 to be inserted into the slot of the connecting shaft 44. It should be noted that in order to ensure the stability of the transmission, the cross-section of the slot is polygonal, and a hexagonal setting is adopted in this embodiment. The walking wheel 1 31 and the walking wheel 2 33 rotate, and the rotation of the walking wheel 2 33 drives the rotating shaft 32 to rotate. The rotating shaft 32 drives the connecting shaft 44 to rotate through the connecting block 45, thereby causing the clockwork spring 43 to store force, and a pressure sensor can be installed on the fixed disk 42 to detect the degree of contraction of the clockwork spring 43 to avoid excessive accumulation of force.

[0038] The bracket 9 is fixedly provided with support rods 15 on both sides of the fixed plate 42, and a fixed sleeve 16 is fixedly provided on the support rod 15. A slide rod 17 is slidably provided in the fixed sleeve 16. The positioning plate 10 is fixedly provided at the end of the slide rod 17. A magnetic block 18 and an electromagnet 19 are respectively provided at the bottom end of the slide rod 17 and in the fixed sleeve 16. When the electromagnet 19 is energized, it can attract the magnetic block 18. A connecting spring 20 is provided in the fixed sleeve 16, and the two ends of the connecting spring 20 are fixedly connected to the slide rod 17 and the bottom of the fixed sleeve 16 respectively. The rotation limit of the driving shaft 41 and the connecting shaft 44 is realized by the pressure of the positioning plate 10 and the surface of the connecting shaft 44 or the driving shaft 41, so that the clockwork spring 43 can smoothly store force.

[0039] A plurality of convex strips 21 are fixedly provided on the outer sides of the connecting shaft 44 and the driving shaft 41 and the inner side of the positioning plate 10 . The engagement between the convex strips 21 can better achieve the positioning effect of the positioning plate 10 on the connecting shaft 44 and the driving shaft 41 .

[0040] The bracket 9 is fixedly provided with a mounting frame 22, and the transmission unit 5 includes a transmission shaft 51 rotatably provided on the mounting frame 22, a transmission gear 52 and a transmission bevel gear 53 are provided on the outer side of the transmission shaft 51, a driving bevel gear 54 meshing with the transmission bevel gear 53 is fixedly provided at the end of the driving shaft 41, and slide rails 55 are fixedly provided on both sides of the mounting plate 8, and a rack 56 meshing with the transmission gear 52 is slidably provided in the slide rails 55;

[0041] When the driving shaft 41 rotates, it can drive the driving bevel gear 54 to rotate, and the driving bevel gear 54 drives the transmission bevel gears 53 on both sides to rotate, thereby driving the transmission gear 52 to mesh with the rack 56, so that the rack 56 moves.

[0042] A sliding groove 23 is provided on the bottom plate 1 , a sliding frame 24 is slidably arranged in the sliding groove 23 , and the main body 2 is fixedly connected to the sliding frame 24 , so that the main body 2 can slide left and right on the bottom plate 1 .

[0043] The connecting component 6 includes two electric push rods 61 respectively fixed on both sides of the sliding frame 24, a pressure plate 62 is set at the end of the electric push rod 61, and a fixed plate 63 is fixed on the top of the rack 56. When the pressure plate 62 presses against the fixed plate 63, the rack 56 can drive the sliding frame 24 to move through the friction force between the pressure plate 62 and the fixed plate 63 when it moves.

[0044] In summary, when going downhill, in order to save energy, the engine or motor can be periodically shut down. At the same time, the controller controls the electromagnet 12 to be energized, thereby driving the magnetic block 13 to move, so that the magnetic block drives the connecting block 45 to be inserted into the slot of the connecting shaft 44, and the walking wheel 1 31 and the walking wheel 2 33 rotate. The rotation of the walking wheel 2 33 drives the rotating shaft 32 to rotate, and the rotating shaft 32 drives the connecting shaft 44 to rotate through the connecting block 45, thereby causing the clockwork spring 43 to store force. When the visual sensor detects a curve, when the transport vehicle travels to the curve, the positioning plate 10 releases the positioning of the drive shaft 41. At the same time, one of the two electric push rods 61 drives the pressure plate 62 to press against the fixed plate 63, and which electric push rod 61 is started depends on the direction of the curve. The started electric push rod 61 can always drive the main body 2 to move in the opposite direction of the centrifugal force. When the driving shaft 41 rotates, it can drive the driving bevel gear 54 to rotate. The driving bevel gear 54 drives the transmission bevel gears 53 on both sides to rotate, and then drives the transmission gear 52 to engage with the rack 56, so that the rack 56 moves, and the rack 56 drives the pressure plate 62 to move through the fixed plate 63, thereby driving the main body 2 to move on the bottom plate 1, and the direction of movement of the main body 2 is opposite to the direction of the centrifugal force. Not only can the gravitational potential energy be fully utilized for transportation when going downhill, but the force storage mechanism 4 can also store gravitational potential energy to ensure the smooth movement of the transport vehicle. At the same time, the energy of the gravitational potential energy can also be used to move the main body 2, thereby ensuring that the transport vehicle passes the curve more smoothly.

[0045] Embodiment 2: Embodiment 2 has the same structure as the main body 2 of Embodiment 1, except that the opposing surfaces of the pressure plate 62 and the fixing plate 63 are configured to be serrated, which can increase the friction between the two and achieve better transmission.

[0046] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0047] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. An automatic conveyor for plant materials, comprising a transport vehicle driven by an engine or an electric motor, characterized in that: The transport vehicle comprises a base plate (1) and a main body (2) slidably arranged on the base plate (1), a visual sensor being fixedly arranged at the bottom of the base plate (1), and further comprising: A walking wheel set (3) is arranged at the bottom of the base plate (1) and cooperates with the track to drive the transport vehicle to move along the track; A power storage mechanism (4) is arranged on one side of the running wheel set (3) and can be drivingly connected to the running wheel set (3); The transmission unit (5) is arranged on both sides of the back of the power storage mechanism (4) and is connected to the power storage mechanism (4) in a transmission manner. The main body (2) is provided with a connecting assembly (6) that can be connected to the transmission unit (5), so that the transmission unit (5) drives the main body (2) to slide on the bottom plate (1).

2. The automatic conveyor for plant materials according to claim 1, characterized in that: A fixing frame (7) is arranged at the bottom of the base plate (1), a mounting plate (8) is fixedly arranged on one side of the fixing frame (7), the running wheel group (3) comprises a running wheel 1 (31) rotatably arranged in the fixing frame (7), a rotating shaft (32) is rotatably arranged on the mounting plate (8), a running wheel 2 (33) is arranged outside the rotating shaft (32), and the running wheel 1 (31) and the running wheel 2 (33) are respectively located at the upper and lower sides of the track.

3. The automatic conveyor for plant materials according to claim 2, characterized in that: A bracket (9) is fixedly arranged on the mounting plate (8), and the power storage mechanism (4) comprises a driving shaft (41) rotatably arranged on the bracket (9); a fixed disk (42) is fixedly arranged on one end of the driving shaft (41), a spring (43) is arranged on the fixed disk (42), a connecting shaft (44) is arranged on the side of the fixed disk (42) away from the driving shaft (41), and two ends of the spring (43) are respectively fixedly connected to the fixed disk (42) and the connecting shaft (44); a connecting block (45) is slidably arranged on the rotating shaft (32), and a notch is provided on the connecting shaft (44) for plugging and matching with the connecting block (45); and positioning plates (10) for limiting their own rotation are arranged on the outer sides of the driving shaft (41) and the connecting shaft (44).

4. The automatic conveyor for plant materials according to claim 3, characterized in that: The rotating shaft (32) is provided with a slide groove (11) for the connecting block (45) to slide, an electromagnet (12) is fixedly arranged at the bottom of the slide groove (11), a magnetic block (13) is arranged at the end of the connecting block (45), and when the electromagnet (12) is energized, the magnetic block (13) is repelled, and a support spring (14) is arranged in the slide groove (11), and the two ends of the support spring (14) are respectively fixedly connected to the bottom of the slide groove (11) and the connecting block (45).

5. The automatic conveyor for plant materials according to claim 4, characterized in that: The bracket (9) is fixedly provided with a support rod (15) on both sides of the fixed plate (42), a fixed sleeve (16) is fixedly provided on the support rod (15), a sliding rod (17) is slidably provided in the fixed sleeve (16), the positioning plate (10) is fixedly provided at the end of the sliding rod (17), a second magnetic block (18) and a second electromagnet (19) are respectively provided at the bottom end of the sliding rod (17) and in the fixed sleeve (16), when the second electromagnet (19) is energized, it can attract the second magnetic block (18), a connecting spring (20) is provided in the fixed sleeve (16), and the two ends of the connecting spring (20) are respectively fixedly connected to the sliding rod (17) and the bottom of the fixed sleeve (16).

6. The automatic conveyor for plant materials according to claim 5, characterized in that: A plurality of convex strips (21) are fixedly arranged on the connecting shaft (44), the outer side of the driving shaft (41) and the inner side of the positioning plate (10).

7. The automatic conveyor for plant materials according to claim 6, characterized in that: The bracket (9) is fixedly provided with a mounting frame (22), the transmission unit (5) comprises a transmission shaft (51) rotatably provided on the mounting frame (22), a transmission gear (52) and a transmission bevel gear (53) are provided on the outer side of the transmission shaft (51), a driving bevel gear (54) meshing with the transmission bevel gear (53) is fixedly provided at the end of the drive shaft (41), slide rails (55) are fixedly provided on both sides of the mounting plate (8), and a rack (56) meshing with the transmission gear (52) is slidably provided in the slide rails (55).

8. The automatic conveyor for plant materials according to claim 7, characterized in that: The bottom plate (1) is provided with a sliding groove (23), a sliding frame (24) is slidably arranged in the sliding groove (23), and the main body (2) is fixedly connected to the sliding frame (24).

9. The automatic conveyor for plant materials according to claim 8, characterized in that: The connecting assembly (6) comprises two electric push rods (61) respectively fixedly arranged on both sides of the sliding frame (24), a pressure plate (62) is arranged at the end of the electric push rod (61), and a fixing plate (63) is fixedly arranged on the top of the rack (56). When the pressure plate (62) presses against the fixing plate (63), the sliding frame (24) can be driven to move by the friction force between the pressure plate (62) and the fixing plate (63) when the rack (56) moves.

10. The automatic conveyor for plant materials according to claim 9, characterized in that: The opposing surfaces of the pressing plate (62) and the fixing plate (63) are configured to be sawtooth-shaped.