A clamping device, a platform device and a transfer device

Abstract

This utility model relates to the field of cargo transfer equipment, and discloses a clamping device, a platform device, and a transfer device. The clamping device includes a fixed clamping mechanism and a telescopic clamping mechanism; the fixed clamping mechanism and the telescopic clamping mechanism are arranged opposite to each other for coordinating the clamping of a cargo box; the fixed clamping mechanism clamps one side of the cargo box; the telescopic clamping mechanism clamps the other side of the cargo box and is capable of telescopic movement relative to the fixed clamping mechanism; the telescopic clamping mechanism includes a telescopic component and a clamping part connected to each other; the telescopic component drives the clamping part to telescopically move in the horizontal direction. This utility model can achieve stable clamping and flexible telescopic movement, improving the safety and efficiency of cargo box transfer.

Description

Technical Field

[0001] This utility model relates to the field of cargo transfer equipment, and in particular to a clamping device, a platform device, and a transfer device. Background Technology

[0002] With the development of the logistics industry, automated transfer equipment is increasingly widely used in warehousing and logistics. During cargo box transfer, the clamping device, as a key component, is responsible for clamping and securing the cargo box. Existing clamping devices generally suffer from the following shortcomings: the clamping structure lacks flexibility, making it difficult to adapt to cargo boxes of different sizes; and the clamping force is uneven, easily causing damage to the cargo box. Therefore, there is an urgent need to propose a clamping device, platform device, and transfer equipment to solve the above problems. Utility Model Content

[0003] The purpose of this invention is to provide a clamping device, a platform device, and a transfer equipment that can achieve stable clamping and flexible extension, thereby improving the safety and efficiency of cargo box transfer.

[0004] To solve the above-mentioned technical problems, this utility model provides a clamping device, including: a fixed clamping mechanism and a telescopic clamping mechanism; the fixed clamping mechanism and the telescopic clamping mechanism are arranged opposite to each other for cooperating in clamping a cargo box; the fixed clamping mechanism is used to clamp one side of the cargo box; the telescopic clamping mechanism is used to clamp the other side of the cargo box and is capable of telescopic movement relative to the fixed clamping mechanism; the telescopic clamping mechanism includes a telescopic component and a clamping part connected to each other; the telescopic component is used to drive the clamping part to telescopically move in the horizontal direction.

[0005] Furthermore, both the fixed clamping mechanism and the clamping part include: a fixed frame, a guide block, a clamping plate, and a motion conversion mechanism; the guide block is mounted on the fixed frame and located on both sides of the clamping plate to limit the movement direction of the clamping plate; the clamping plate is movably mounted on the fixed frame; the motion conversion mechanism is used to convert the driving force in one direction into the movement of the clamping plate perpendicular to that direction.

[0006] Furthermore, the motion conversion mechanism includes a cam follower and an electric push rod, with the fixed end of the electric push rod fixed to the fixed frame and the telescopic end connected to the cam follower;

[0007] The clamping plate is provided with a guide groove; the fixing frame is provided with a sliding groove; one end of the cam follower is located in the guide groove, and the other end is located in the sliding groove;

[0008] The electric push rod drives the cam follower to move horizontally, and through the cooperation of the guide groove and the slide groove, drives the clamping plate to move vertically.

[0009] Furthermore, the slide groove is horizontally arranged relative to the clamping plate, and the guide groove is obliquely arranged relative to the slide groove.

[0010] Furthermore, both the fixed clamping mechanism and the clamping part include: a position detection sensor and a target recognition sensor; the position detection sensor is mounted on the fixed frame and is used to detect the position of the clamping plate; the target recognition sensor is mounted on the fixed frame and is used to identify the position of the cargo box; both the position detection sensor and the target recognition sensor are connected to the telescopic assembly.

[0011] Furthermore, the telescopic assembly includes: a mounting bracket, a fixed rack, a movable rack guide rail, a movable rack, a gear, a drive motor, and a motor guide rail;

[0012] The mounting bracket is installed on a movable docking platform; the motor guide rail is fixedly installed on the mounting bracket; the drive motor is installed on the motor guide rail and can slide along the motor guide rail; both the fixed rack and the movable rack guide rail are fixedly installed on the mounting bracket; the movable rack is installed on the movable rack guide rail and can slide along the movable rack guide rail; the gear is connected to the output shaft of the drive motor and meshes with the fixed rack and the movable rack; the clamping part is fixedly installed on the movable rack; the movable rack is arranged parallel to the fixed rack.

[0013] Furthermore, both the gear and the movable rack are located at the middle section of the fixed rack, and the fixed rack and the movable rack simultaneously mesh with the same gear.

[0014] Furthermore, the gear includes: a first gear and a second gear; the first gear meshes with the fixed rack; the second gear meshes with the movable rack; the pitch circle diameters of the first gear and the second gear are different.

[0015] In addition, this utility model also proposes a platform device, including a movable docking platform and a clamping device as described above; the fixed clamping mechanism and the telescopic clamping mechanism in the clamping device are respectively arranged on both sides of the movable docking platform to clamp the cargo box.

[0016] In addition, this utility model also proposes a transfer device, including a transfer unit and a platform device as described above; the platform device is disposed on the transfer unit; the transfer unit is used to drive the platform device to move up and down to dock with docking positions at different heights.

[0017] Through the above technical solution, this utility model has the following beneficial effects:

[0018] By arranging a fixed clamping mechanism and a telescopic clamping mechanism opposite to each other, and enabling the telescopic clamping mechanism to extend and retract relative to the fixed clamping mechanism, stable clamping and coordinated transfer of the cargo box are achieved. The fixed and telescopic clamping mechanisms work together to complete a "relay" transfer process: first, the telescopic clamping mechanism clamps the front end of the cargo box and pulls it to the fixed clamping mechanism; then, the fixed clamping mechanism takes over; finally, the telescopic clamping mechanism adjusts its position to clamp the rear end of the cargo box, ultimately completing the overall transfer of the cargo box. This collaborative working mode greatly improves the stability and reliability of cargo box transfer, avoiding the risk of cargo box shifting or falling during the transfer process.

[0019] Furthermore, the motion conversion mechanism converts horizontal driving force into vertical movement of the clamping plate, resulting in smoother and more precise clamping action. The telescopic component employs a rack and pinion drive structure; when the gear meshes with both the fixed and movable racks simultaneously, the movable rack achieves double the extension / retraction range, significantly expanding the clamping device's working range. Integrating this clamping device into a lifting platform system enables automated loading and unloading of containers at different heights, meeting the multi-level transfer needs of complex logistics scenarios. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the fixing clamping mechanism or clamping part in the clamping device according to one embodiment of the present invention;

[0021] Figure 2 This is a side view of the fixing clamping mechanism or clamping part in the clamping device according to one embodiment of the present invention;

[0022] Figure 3 This is a top view of the fixed clamping mechanism or clamping part in the clamping device according to one embodiment of the present invention;

[0023] Figure 4 This is a top view of the guide groove of the fixed clamping mechanism or clamping part in a clamping device according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the overall structure of the telescopic clamping mechanism in one direction of a clamping device in one embodiment of the present invention;

[0025] Figure 6 This is a top view of the telescopic clamping mechanism in a clamping device according to one embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the overall structure of the telescopic clamping mechanism in the clamping device in another direction in one embodiment of the present invention;

[0027] Figure 8This is a top view of the telescopic clamping mechanism in the clamping device in one embodiment of the present invention from another direction;

[0028] Figure 9 This is a schematic diagram of the telescopic component in the telescopic clamping mechanism of the clamping device in one embodiment of the present invention;

[0029] Figure 10 This is a schematic diagram of the platform device in one embodiment of the present invention.

[0030] In the diagram, 402 is the fixed clamping mechanism; 4021 is the fixed frame; 4022 is the guide block; 4023 is the clamping plate; 4024 is the cam follower; 4025 is the electric push rod; 4026 is the positioning detection sensor; 4027 is the target recognition sensor; 4028 is the guide groove; 404 is the telescopic clamping mechanism; 4041 is the mounting frame; 4042 is the fixed rack; 4043 is the movable rack guide rail; 4044 is the movable rack; 4045 is the clamping part; 4046 is the gear; 4047 is the drive motor; 4048 is the motor guide rail; and 403 is the movable docking platform. Detailed Implementation

[0031] The clamping device, platform device, and transfer equipment of this utility model will now be described in more detail with reference to the accompanying drawings, which illustrate preferred embodiments of this utility model. It should be understood that those skilled in the art can modify the utility model described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the utility model.

[0032] The present invention will be described in more detail below by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0033] This utility model embodiment provides a convenient and practical clamping device, including: a fixed clamping mechanism 402 and a telescopic clamping mechanism 404. Specifically, the fixed clamping mechanism 402 and the telescopic clamping mechanism 404 are arranged opposite to each other for cooperating in clamping a cargo box; the fixed clamping mechanism 402 is used to clamp one side of the cargo box; the telescopic clamping mechanism 404 is used to clamp the other side of the cargo box and can telescopically move relative to the fixed clamping mechanism 402; the telescopic clamping mechanism 404 includes a telescopic component and a clamping part 4045 connected to each other; the telescopic component is used to drive the clamping part 4045 to telescopically move in the horizontal direction.

[0034] In one specific example, the fixed clamping mechanism 402 and the telescopic clamping mechanism 404 are arranged symmetrically, with one side fixed and the other side movable. This arrangement can adapt to cargo boxes of different widths, enhancing the applicability of the device. The telescopic clamping mechanism 404 can automatically adjust its position according to the width of the cargo box, improving the clamping accuracy and stability.

[0035] In one embodiment, such as Figures 1-4 As shown, both the fixed clamping mechanism 402 and the clamping part 4045 include: a fixed frame 4021, a guide block 4022, a clamping plate 4023, and a motion conversion mechanism.

[0036] Specifically, the guide block 4022 is mounted on the fixed frame 4021 and located on both sides of the clamping plate 4023 to limit the movement direction of the clamping plate 4023; the clamping plate 4023 is movably mounted on the fixed frame 4021; the motion conversion mechanism is used to convert the driving force in one direction into the movement of the clamping plate 4023 in a direction perpendicular to that direction.

[0037] In this embodiment, the motion conversion mechanism includes a cam follower 4024 and an electric push rod 4025. Specifically, the fixed end of the electric push rod 4025 is fixed to the fixed frame 4021, and the telescopic end is connected to the cam follower 4024; the clamping plate 4023 is provided with a guide groove 4028; the fixed frame 4021 is provided with a sliding groove; one end of the cam follower 4024 is located in the guide groove 4028, and the other end is located in the sliding groove; the electric push rod 4025 drives the cam follower 4024 to move horizontally, and through the cooperation of the guide groove 4028 and the sliding groove, drives the clamping plate 4023 to move vertically. This motion conversion mechanism utilizes the motion conversion principle of the cam follower 4024 to convert the horizontal thrust generated by the electric push rod 4025 into the vertical movement of the clamping plate 4023, simplifying the control system and improving the structural compactness.

[0038] In this embodiment, the moving direction of the clamping plate 4023 is perpendicular to the fixing frame 4021. The guide blocks 4022 on both sides of the clamping plate 4023 form dovetail grooves with the fixing frame 4021.

[0039] Preferably, the slide groove is horizontally arranged relative to the clamping plate 4023, and the guide groove 4028 is obliquely arranged relative to the slide groove. By setting the horizontal slide groove and the oblique guide groove 4028, the cam follower 4024 can drive the clamping plate 4023 to move vertically along the oblique guide groove 4028 during horizontal movement. Those skilled in the art will know that the inclination angle of the guide groove 4028 can be set according to actual needs, and other embodiments besides this one are also possible. The larger the inclination angle, the greater the vertical movement distance relative to the horizontal movement distance, but the greater the required driving force; the smaller the inclination angle, the smaller the required driving force, but the correspondingly smaller the vertical movement distance. Generally, the inclination angle can be set between 30° and 60° to balance the requirements of driving force and movement distance.

[0040] In this embodiment, both the fixing clamping mechanism 402 and the clamping part 4045 further include: a position detection sensor 4026 and a target recognition sensor 4027. Specifically, the position detection sensor 4026 is mounted on the fixing frame 4021 and is used to detect the position of the clamping plate 4023; the target recognition sensor 4027 is mounted on the fixing frame 4021 and is used to identify the position of the cargo box; both the position detection sensor 4026 and the target recognition sensor 4027 are connected to the telescopic assembly. In a specific example, the position detection sensor 4026 can be a photoelectric switch or a Hall sensor to monitor the position status of the clamping plate 4023 in real time, preventing the clamping plate 4023 from overtravel and causing mechanical damage. The target recognition sensor 4027 can be an infrared sensor or a photoelectric pair to accurately identify the edge position of the cargo box and improve clamping accuracy.

[0041] In a specific example, when the front end of the cargo box is pulled by the telescopic clamping mechanism 404 to a position aligned with the fixed clamping mechanism 402, the fixed clamping mechanism 402 begins to operate. Its electric push rod 4025 activates upon receiving a control signal, extending and pushing the cam follower 4024 to move horizontally. One end of the cam follower 4024 slides in a groove, while the other end moves in an inclined guide groove 4028 on the clamping plate 4023. This combined motion converts the horizontal movement of the cam follower 4024 into a vertical movement of the clamping plate 4023 perpendicular to the fixed frame 4021, causing the clamping plate 4023 to stably move outward and clamp the front end of the cargo box. When the positioning detection sensor 4026 confirms that the clamping is complete, the electric push rod 4025 stops operating, maintaining the clamping state. When it is necessary to release the cargo box, the electric push rod 4025 moves in the opposite direction, causing the cam follower 4024 to return to its original position, the clamping plate 4023 rises, and the clamping of the cargo box is released.

[0042] In one embodiment, such as Figures 5-9As shown, the telescopic assembly includes: a mounting bracket 4041, a fixed rack 4042, a movable rack guide rail 4043, a movable rack 4044, a gear 4046, a drive motor 4047, and a motor guide rail 4048.

[0043] Specifically, the mounting bracket 4041 is mounted on a movable docking platform 403; the motor guide rail 4048 is fixedly mounted on the mounting bracket 4041; the drive motor 4047 is mounted on the motor guide rail 4048 and can slide along the motor guide rail 4048; the fixed rack 4042 and the movable rack guide rail 4043 are both fixedly mounted on the mounting bracket 4041; the movable rack 4044 is mounted on the movable rack guide rail 4043 and can slide along the movable rack guide rail 4043; the gear 4046 is connected to the output shaft of the drive motor 4047 and meshes with the fixed rack 4042 and the movable rack 4044; the clamping part 4045 is fixedly mounted on the movable rack 4044; the movable rack 4044 is arranged parallel to the fixed rack 4042.

[0044] In this embodiment, when the telescopic component is in operation, the drive motor 4047 drives the gear 4046 to rotate. Since the gear 4046 meshes with the fixed rack 4042, the drive motor 4047 moves along the motor guide rail 4048. Simultaneously, the gear 4046 meshes with the movable rack 4044, causing the movable rack 4044 to move along the movable rack guide rail 4043. Through this gear 4046-rack transmission combination, precise telescopic control of the telescopic clamping mechanism 404 is achieved.

[0045] In a preferred embodiment, both the gear 4046 and the movable rack 4044 are positioned at the middle section of the fixed rack 4042, and both the fixed rack 4042 and the movable rack 4044 simultaneously mesh with the same gear 4046. When the drive motor 4047 operates, a multiplication effect is generated because the gear 4046 simultaneously meshes with both the fixed rack 4042 and the movable rack 4044: as the gear 4046 moves along the fixed rack 4042, the movable rack 4044 also moves relative to the gear 4046. This makes the moving distance of the movable rack 4044 twice the moving distance of the gear 4046, thereby achieving a greater range of telescopic movement within a limited space and increasing the working range of the clamping device.

[0046] In another preferred embodiment, the gear 4046 includes a first gear and a second gear. Specifically, the first gear meshes with the fixed rack 4042; the second gear meshes with the movable rack 4044; the first gear and the second gear have different pitch circle diameters. By using gears 4046 with different pitch circle diameters, the speed ratio and displacement ratio of the movable rack 4044 relative to the gears 4046 can be adjusted. For example, when the diameter of the second gear is larger than that of the first gear, the movable rack 4044 will move faster and cover a greater distance; conversely, the movement speed will be slower but the torque will be greater. Those skilled in the art will understand that the diameter ratio of the two gears 4046 can be set according to actual needs, and other embodiments besides this one are also possible.

[0047] In a specific example, when the drive motor 4047 starts, the gear 4046 on its output shaft simultaneously meshes with both the fixed rack 4042 and the movable rack 4044. Since the fixed rack 4042 remains stationary, the rotation of the gear 4046 moves it along the fixed rack 4042, causing the entire motor assembly to slide on the motor guide rail 4048. Simultaneously, the meshing of the gear 4046 with the movable rack 4044 causes the movable rack 4044 to move relative to the movable rack guide rail 4043. This structural design ensures that when the gear 4046 moves one unit distance along the fixed rack 4042, the movable rack 4044 moves two unit distances relative to the mounting bracket 4041, achieving a doubling effect on the travel distance. Because the clamping part 4045 is fixedly mounted on the movable rack 4044, the movement of the movable rack 4044 directly drives the clamping part 4045 to achieve a wide range of high-precision telescopic movements, providing technical assurance for the accurate positioning and clamping of the cargo box.

[0048] In addition, such as Figure 10 As shown, this utility model also proposes a platform device, including a movable docking platform 403 and a clamping device as described above; the fixed clamping mechanism 402 and the telescopic clamping mechanism 404 in the clamping device are respectively arranged on both sides of the movable docking platform 403 to clamp the cargo box.

[0049] In addition, this utility model also proposes a transfer device, including a transfer unit and a platform device as described above; the platform device is disposed on the transfer unit; the transfer unit is used to drive the platform device to move up and down to dock with docking positions at different heights.

[0050] In this embodiment, initially, both the fixed clamping mechanism 402 and the telescopic clamping mechanism 404 are in the released state, and the platform is already docked with the target shelf. First, the telescopic clamping mechanism 404, driven by the drive motor 4047, moves the gear 4046 along the fixed rack 4042, and the movable rack 4044 drives the clamping part 4045 to extend towards the cargo box until the target recognition sensor 4027 detects the front end of the cargo box. Then, the electric push rod 4025 of the telescopic clamping mechanism 404 is activated, pushing the cam follower 4024 to move in the slide and guide groove 4028, converting the horizontal motion into the vertical motion of the clamping plate 4023, clamping the front end of the cargo box. Next, the drive motor 4047 runs in the opposite direction, and the movable rack 4044 drives the clamping part 4045 and the clamped cargo box to move towards the center of the platform, while the locking mechanism of the cargo box on the shelf unlocks.

[0051] When the front end of the cargo box aligns with the fixed clamping mechanism 402, the electric push rod 4025 of the fixed clamping mechanism 402 is activated, clamping the other side of the front end of the cargo box. The telescopic clamping mechanism 404 then releases the front clamp. Subsequently, the telescopic clamping mechanism 404 continues to move and adjust its position to the rear end of the cargo box. The electric push rod 4025 again drives the clamping plate 4023 to move and clamp the rear end of the cargo box. At this point, the front end of the cargo box is controlled by the fixed clamping mechanism 402, and the rear end is controlled by the telescopic clamping mechanism 404. Finally, the fixed clamping mechanism 402 releases, and the telescopic clamping mechanism 404 independently controls the cargo box and pulls it to the center of the platform, completing the safe transfer process. This collaborative working mode ensures that the cargo box remains clamped throughout the entire transfer process, greatly improving the stability and safety of the transfer.

[0052] In summary, the clamping device, platform device, and transfer equipment proposed in this utility model have the following advantages:

[0053] By arranging a fixed clamping mechanism and a telescopic clamping mechanism opposite to each other, and enabling the telescopic clamping mechanism to extend and retract relative to the fixed clamping mechanism, stable clamping and coordinated transfer of the cargo box are achieved. The fixed and telescopic clamping mechanisms work together to complete a "relay" transfer process: first, the telescopic clamping mechanism clamps the front end of the cargo box and pulls it to the fixed clamping mechanism; then, the fixed clamping mechanism takes over; finally, the telescopic clamping mechanism adjusts its position to clamp the rear end of the cargo box, ultimately completing the overall transfer of the cargo box. This collaborative working mode greatly improves the stability and reliability of cargo box transfer, avoiding the risk of cargo box shifting or falling during the transfer process.

[0054] Furthermore, the motion conversion mechanism converts horizontal driving force into vertical movement of the clamping plate, resulting in smoother and more precise clamping action. The telescopic component employs a rack and pinion drive structure; when the gear meshes with both the fixed and movable racks simultaneously, the movable rack achieves double the extension / retraction range, significantly expanding the clamping device's working range. Integrating this clamping device into a lifting platform system enables automated loading and unloading of containers at different heights, meeting the multi-level transfer needs of complex logistics scenarios.

[0055] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A clamping device, characterized in that, include: A fixed clamping mechanism (402) and a telescopic clamping mechanism (404) are provided opposite to each other for cooperating in clamping a cargo box (5). The fixed clamping mechanism (402) is used to clamp one side of the cargo box (5). The telescopic clamping mechanism (404) is used to clamp the other side of the cargo box (5) and is capable of telescopic movement relative to the fixed clamping mechanism (402). The telescopic clamping mechanism (404) includes a telescopic component and a clamping part (4045) connected to each other. The telescopic component is used to drive the clamping part (4045) to telescopically move in the horizontal direction.

2. The clamping device as described in claim 1, characterized in that, Both the fixed clamping mechanism (402) and the clamping part (4045) include: a fixed frame (4021), a guide block (4022), a clamping plate (4023), and a motion conversion mechanism; the guide block (4022) is mounted on the fixed frame (4021) and located on both sides of the clamping plate (4023) to limit the movement direction of the clamping plate (4023); the clamping plate (4023) is movably mounted on the fixed frame (4021); the motion conversion mechanism is used to convert the driving force in one direction into the movement of the clamping plate (4023) in a direction perpendicular to that direction.

3. The clamping device as described in claim 2, characterized in that, The motion conversion mechanism includes a cam follower (4024) and an electric push rod (4025). The fixed end of the electric push rod (4025) is fixed on the fixed frame (4021), and the telescopic end is connected to the cam follower (4024). The clamping plate (4023) is provided with a guide groove (4028); the fixing frame (4021) is provided with a sliding groove; one end of the cam follower (4024) is located in the guide groove (4028), and the other end is located in the sliding groove; The electric push rod (4025) drives the cam follower (4024) to move horizontally, and through the cooperation of the guide groove (4028) and the slide groove, drives the clamping plate (4023) to move vertically.

4. The clamping device as described in claim 3, characterized in that, The slide groove is horizontally arranged relative to the clamping plate (4023), and the guide groove (4028) is obliquely arranged relative to the slide groove.

5. The clamping device as described in claim 2, characterized in that, The fixed clamping mechanism (402) and the clamping part (4045) each include: a position detection sensor (4026) and a target recognition sensor (4027); the position detection sensor (4026) is mounted on the fixed frame (4021) and is used to detect the position of the clamping plate (4023); the target recognition sensor (4027) is mounted on the fixed frame (4021) and is used to identify the position of the cargo box (5); both the position detection sensor (4026) and the target recognition sensor (4027) are connected to the telescopic assembly.

6. The clamping device as described in claim 1, characterized in that, The telescopic assembly includes: a mounting bracket (4041), a fixed rack (4042), a movable rack guide rail (4043), a movable rack (4044), a gear (4046), a drive motor (4047), and a motor guide rail (4048); The mounting bracket (4041) is mounted on a movable docking platform (403); the motor guide rail (4048) is fixedly mounted on the mounting bracket (4041); the drive motor (4047) is mounted on the motor guide rail (4048) and can slide along the motor guide rail (4048); the fixed rack (4042) and the movable rack guide rail (4043) are both fixedly mounted on the mounting bracket (4041); the movable rack (404... 4) Installed on the movable rack guide rail (4043), and able to slide along the movable rack guide rail (4043); the gear (4046) is connected to the output shaft of the drive motor (4047) and meshes with the fixed rack (4042) and the movable rack (4044); the clamping part (4045) is fixedly installed on the movable rack (4044); the movable rack (4044) and the fixed rack (4042) are arranged parallel to each other.

7. The clamping device as described in claim 6, characterized in that, The gear (4046) and the movable rack (4044) are both located in the middle section of the fixed rack (4042), and the fixed rack (4042) and the movable rack (4044) mesh with the same gear (4046) simultaneously.

8. The clamping device as described in claim 6, characterized in that, The gear (4046) includes: a first gear and a second gear; the first gear meshes with the fixed rack (4042); the second gear meshes with the movable rack (4044); the pitch circle diameters of the first gear and the second gear are different.

9. A platform device, characterized in that, It includes a movable docking platform (403) and a clamping device as described in any one of claims 1-8; the fixed clamping mechanism (402) and the telescopic clamping mechanism (404) in the clamping device are respectively disposed on both sides of the movable docking platform (403) to clamp the cargo box.

10. A transfer device, characterized in that, It includes a transfer device and a platform device as described in claim 9; the platform device is disposed on the transfer device; the transfer device is used to drive the platform device to move up and down to dock with docking positions at different heights.

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