An in-carriage conveying device

Abstract

This invention discloses an in-box conveying device, including a movable conveying platform, a limiting frame, and a guide seat. The movable conveying platform includes a fixed base and a conveying frame. A conveying section is located on the top of the conveying frame. The conveying frame is movably mounted on the fixed base in a horizontal linear sliding manner. The direction of movement of the conveying frame on the fixed base is parallel to the conveying direction of the conveying frame in the conveying section. The limiting frame is movably connected to the conveying frame via guide rails and is movably mounted on the conveying frame in a vertical linear sliding manner. Two sets of rollers are provided at the bottom of the limiting frame. The in-box conveying device provides anti-shaking functionality through a fixed base structure and end-limiting mechanisms, thereby preventing shaking during product conveying and providing stable conveying functionality with a robust structure and stable operation.

Description

Technical Field

[0001] This invention relates to an in-carriage conveying device. Background Technology

[0002] Loading goods into vans and containers used in logistics is typically done manually, which is time-consuming, labor-intensive, inefficient, and incurs high safety management costs. Manual handling involves starting from the container door and stacking items one by one from the inside out, resulting in a significant distance between the door and the stacking position. To save time and labor and reduce manual labor intensity, existing technologies employ mobile conveyor systems to transport goods into the container. Examples include non-powered telescopic roller conveyors and conveyor systems with adjustable pitch angles at the end of the conveyor belt. These all feature significant overall mobility, which gives them advantages in flexibility. However, the structure upon which this mobility is based is not stable; it is loose, prone to swaying during transport, and has a very limited load-bearing capacity, thus limiting its applicability and posing potential safety hazards. Summary of the Invention

[0003] The technical problem to be solved by the present invention is how to suppress the shaking of the in-carriage conveying device during the conveying process, thereby obtaining an in-carriage conveying device with a robust structure and stable working performance.

[0004] To solve the above technical problems, the present invention adopts the following technical solution: The in-carriage conveying device includes a movable conveying platform, a limiting frame, and a guide seat. The movable conveying platform includes a fixed base and a conveying frame. The top of the conveying frame is provided with a conveying part. The conveying frame is movably mounted on the fixed base in a horizontal linear sliding manner. The direction of movement of the conveying frame on the fixed base is parallel to the conveying direction of the conveying frame in the conveying part. The limiting frame is movably connected to the conveying frame through a guide rail. The limiting frame is movably mounted on the conveying frame in a vertical linear sliding manner. The bottom of the limiting frame is provided with rollers, which are distributed in a direction parallel to the conveying direction of the conveying part. The guide seat has a working surface located directly below the roller. The working surface includes a guide ramp and a horizontal support surface, which are distributed along a direction parallel to the conveying direction of the conveying part. One end of the guide ramp is connected to the horizontal support surface. The vertical height of one end of the guide ramp is higher than the vertical height of the other end of the guide ramp. The vertical height of the conveying part is higher than the vertical height of the horizontal support surface. The limiting frame is movably connected to the guide seat by supporting the roller through the working surface. The departure angle of the roller closest to the conveying frame on the limiting frame is greater than the inclination angle of the guide ramp relative to the horizontal plane.

[0005] The conveyor system inside the compartment exhibits a telescopic feature, which is related to the fact that the conveyor frame on the movable conveyor platform can slide linearly on a fixed base. It's easy to imagine that after the conveyor frame moves linearly along the fixed base, the limiting frame at the end of the conveyor frame will be pushed and move along the working surface provided by the guide seat. The fixed base can be a metal frame fixed to the foundation, such as a metal frame fixed to a platform; or it can be a floor-mounted metal frame, securely placed in the working position by its own weight. After the conveyor frame extends outward, the center of gravity of the movable conveyor platform will shift. In this technical solution, the vertical support of the conveyor frame comes entirely from the base. This shift in the center of gravity will inevitably have a slight adverse effect on the end of the movable conveyor frame furthest from the base. This adverse effect will manifest as a slight sway at the end of the movable conveyor frame due to minor deformation of components during the load-bearing conveying phase. This slight sway is what this technical solution aims to suppress; therefore, the limiting frame is movably installed at the end of the conveyor frame. The limiting frame and the conveying frame are unrestrained in the vertical direction and can move relative to each other, while they are mutually constrained in the horizontal direction and move synchronously. This constraint effect is achieved based on the guide rail structure. Although the limiting frame does not provide support to the end of the conveying frame, the limiting effect brought about by the inertia of the limiting frame can effectively suppress small swaying at the end of the conveying frame. Another function of the limiting frame is to serve as a loading platform for the in-car conveying device, facilitating workers' standing and providing temporary buffer items.

[0006] The range of rollers at the bottom of the limiting frame includes any rolling components or parts that reduce friction during the movement of the limiting frame. In this technical solution, at least two sets of rollers are included, distributed back-to-back in a direction parallel to the conveying direction of the conveying section, separated by a certain distance. The roller closest to the conveying frame has a specific departure angle requirement on the limiting frame. This design ensures that when the limiting frame is supported by the horizontal support surface, the guide ramp, and the carriage floor, at least one roller is always supported, i.e., at least one roller is always in contact with the ground, thus ensuring that the limiting frame maintains flexible movement as it follows the conveying frame.

[0007] The horizontal support surface functions when the limiting frame returns to its initial state, while the guide ramp, acting as a transition structure between the horizontal support surface and the vehicle floor, functions when the limiting frame moves into the vehicle, i.e., when the conveyor frame extends outward. Since the guide ramp is inclined relative to both the horizontal plane and the horizontal support surface, the vehicle floor height must be lower than the horizontal support surface height. To prevent the guide seat from forming a cutting edge or shearing structure below the guide ramp that could affect safe production, the guide seat is provided with a protective surface extending in a vertical plane, which connects to the other end of the guide ramp. The protective surface prevents vehicle components from extending below the guide ramp or the guide ramp portion of the guide seat from embedding into the vehicle floor, thereby eliminating potential safety hazards during production operations.

[0008] The limiting frame requires stable support conditions in both the initial and working states. Therefore, it is necessary to ensure that both sets of rollers at the bottom are supported. For this reason, the length of the horizontal support surface is greater than the maximum center distance between the rollers.

[0009] The conveying section can be constructed using either a non-powered or powered design approach. In a non-powered design, the conveying section can be constructed using non-powered rollers, omnidirectional ball bearings, or a non-powered conveyor belt. In a powered design, it can be constructed using a motor-driven conveyor belt and motor-driven rollers. Clearly, when handling heavy products or products with surfaces difficult to touch, a powered design approach can be more effective. Therefore, the mobile conveying platform also includes an active conveying component, which comprises a conveyor belt, pulleys, and a power unit. The conveyor belt is mounted on the conveyor frame via pulleys, and the power unit is mounted on the conveyor frame. The conveyor belt is connected to and driven by the power unit. The conveyor belt can be a synchronous belt, a conveyor mesh belt, or a plastic chain plate. Driving the conveyor belt with a power unit reduces labor intensity and improves operational safety.

[0010] For ease of use, the conveying frame and the fixed base are movably connected via guide rails. The movable conveying platform is equipped with a linear power unit I, which is mounted on the fixed base. The linear power unit I has a power output end, which is connected to the conveying frame, and the linear power unit I drives the conveying frame to move on the fixed base. The linear power unit I controls the extension and retraction of the internal conveying device, replacing manual pushing operations.

[0011] To increase the operating range of the in-carrying conveyor, i.e., to increase the telescopic range, the movable conveying platform also includes an auxiliary frame. The conveying frame and the auxiliary frame are movably connected by guide rails. The conveying frame is movably mounted on the auxiliary frame in a horizontal linear sliding manner. The auxiliary frame and the fixed base are movably connected by guide rails. The auxiliary frame is movably mounted on the fixed base in a horizontal linear sliding manner.

[0012] Similarly, for ease of use and to improve mechanization, the movable conveyor platform is equipped with linear power unit I and linear power unit II. Linear power unit I is mounted on a fixed base and has a power output end. The power output end of linear power unit I is connected to an auxiliary frame, and linear power unit I drives the auxiliary frame to move on the fixed base. Linear power unit II is mounted on the auxiliary frame and has a power output end. The power output end of linear power unit II is connected to a conveyor frame, and linear power unit II drives the conveyor frame to move on the auxiliary frame.

[0013] The present invention adopts the above-mentioned technical solution: the in-box conveying device provides the function of suppressing swaying through a fixed foundation structure and also provides the function of suppressing swaying through end restriction, so that the in-box conveying device can avoid the problem of swaying during product transportation and provide a stable conveying function with a solid structure and stable state. Attached Figure Description

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a front view of a first embodiment of an in-carriage conveying device according to the present invention;

[0016] Figure 2 This is a perspective view of a first embodiment of an in-carriage conveying device according to the present invention;

[0017] Figure 3 This is a perspective view of a seventh embodiment of an in-carriage conveying device of the present invention;

[0018] Figure 4 This is a perspective view of a ninth embodiment of an in-carriage conveying device of the present invention. Detailed Implementation

[0019] like Figure 1 , 2 As shown, this is the first embodiment of the present invention. Warehouses are major transshipment points for goods, with frequent turnover. To facilitate loading and unloading, warehouses are generally equipped with platforms. In this embodiment, the in-carriage conveyor is installed on the warehouse platform.

[0020] The in-carriage conveying device includes a movable conveying platform, a limiting frame 4, and a guide seat 6.

[0021] The mobile conveyor platform includes a fixed base 1 and a conveyor frame 2. The fixed base 1 is made of welded metal and is fixed to the platform, thus the fixed base 1 is firmly connected to the ground.

[0022] The main body of the conveyor frame 2 is welded from metal. Both sides of the conveyor frame 2 are movably connected to the fixed base 1 via guide rails. The guide rails include linear slide rails and guide sleeves. The guide sleeves are fixed to the inner side of the fixed base 1, and the linear slide rails are fixed horizontally to the outer side of the conveyor frame 2. One side of the fixed base 1 has an opening structure, ensuring that the conveyor frame 2 can extend outwards from one side when sliding on the fixed base 1. Based on the connection of the guide rails, the conveyor frame 2 can perform a horizontal linear reciprocating sliding motion relative to the fixed base 1, forming an overall telescopic movement.

[0023] A conveyor belt is installed on the top of the conveyor frame 2 via pulleys, forming a conveying section 3 on top of the conveyor frame 2. The conveyor belt is supported only by the pulleys and is not powered; however, it can be easily driven by external force. Therefore, when an item placed on the conveyor belt is pushed by an external force, the item moves smoothly along the conveyor belt, creating the technical effect of conveying items in the conveying section 3. The conveyor frame 2 moves on the fixed base 1 in a direction parallel to the conveying direction of the conveyor frame 2 in the conveying section 3.

[0024] The limiting frame 4 is a gantry-type frame structure. It is positioned at one end of the conveying frame 2 and is movably connected to it via a guide rail. The guide rail also includes a linear slide rail and a guide sleeve. The guide sleeve is mounted on the conveying frame 2, and the linear slide rail is fixed vertically on the limiting frame 4. The limiting frame 4 can perform linear reciprocating motion relative to the conveying frame 2 in the vertical direction. The middle of the limiting frame 4 is a hollow structure, which is located precisely in the conveying direction of the conveying section 3 of the conveying frame 2.

[0025] The bottom of the limiting frame 4 is provided with two sets of rollers 5, with two rollers in each set. The number of sets and the quantity of each set of rollers 5 can be set according to actual needs. In this embodiment, two sets and two rollers in each set are used as an example to illustrate this technical feature. The two sets of rollers 5 are arranged separately in the direction of linear reciprocating motion of the vertical conveying frame 2 on the fixed base 1, and each set of rollers 5 is distributed in the direction parallel to the conveying direction of the conveying part 3, that is, in the direction of linear reciprocating motion of the conveying frame 2 on the fixed base 1. The four rollers 5 are arranged in a matrix at the bottom of the limiting frame 4. Two of these four rollers 5 are farther away from the conveying frame 2, and the other two are closer to the conveying frame 2.

[0026] The guide seat 6 is also fixed to the platform, and like the fixed base 1, it is firmly integrated with the ground. The guide seat 6 is located below the position of the limiting frame 4, and its function is to support the limiting frame 4.

[0027] The guide seat 6 is provided with a protective surface 9 and a working surface for contacting the rollers 5. The working surface includes a guide ramp 7 and a horizontal support surface 8. The horizontal support surface 8 is a horizontal surface structure with a length greater than the center distance between the two sets of rollers 5. The guide ramp 7 is a planar structure with a tilted spatial orientation, and the vertical height of the conveying part 3 is higher than the vertical height of the horizontal support surface 8. The horizontal support surface 8 and the guide ramp 7 are distributed one after another along a direction parallel to the conveying direction of the conveying part 3. One end of the horizontal support surface 8 is connected to one end of the guide ramp 7, and the vertical height of the end of the guide ramp 7 that is connected to the horizontal support surface 8 is higher than the vertical height of the other end of the guide ramp 7. The protective surface 9 is a vertical planar structure, and the other end of the protective surface 9 is connected to the guide ramp 7.

[0028] Since the limiting frame 4 is unrestrained in the vertical direction, one or two of the rollers 5 in each group always remain in contact with the working surface under their own weight. The guide seat 6 provides support to the limiting frame 4, so the limiting frame 4 is movably connected to the guide seat 6 by supporting the rollers 5 through the working surface. To ensure a smooth transition of the rollers 5 between the guide slope 7 and the horizontal support surface 8, the departure angle of the roller 5 closest to the conveying frame 2 on the limiting frame 4 is greater than the inclination angle of the guide slope 7 relative to the horizontal plane. This avoids interference between the frame of the limiting frame 4 and the guide slope 7 of the guide seat 6. In the initial state, the conveying frame 2 is located inside the fixed base 1, the entire limiting frame 4 is placed above the horizontal support surface 8, and all four rollers 5 are connected to the horizontal support surface 8.

[0029] The in-carriage conveyor serves vans, containers, and similar vehicles. During operation, the vehicle drives directly into the platform area, ensuring the carriage remains within the conveyor's working range. The carriage floor height is within the range of the guide ramp 7. The protective surface 9 prevents vehicle components, such as the carriage floor and crash barriers, from impacting the platform and also prevents the formation of blade-like or shearing structures below the guide ramp 7 that could affect safe production. After the carriage floor aligns with the guide ramp 7, the worker first pushes the conveyor frame 2, causing it to extend towards the interior of the carriage. Simultaneously, the limiting frame 4, pushed horizontally by the conveyor frame 2, also moves towards its position inside the carriage. Initially, all rollers 5 are in contact with the horizontal support surface 8. Then, the roller 5 furthest from the conveyor frame 2 extends above the guide ramp 7 and is suspended in the air. At this time, the weight of the limiting frame 4 is borne by the roller 5 closest to the conveyor frame 2. Next, the roller 5 closest to the conveyor frame 2 leaves the horizontal support surface 8 and begins to contact the guide ramp 7. The roller 5 furthest from the conveyor frame 2 is still suspended in the air, and the weight of the limiting frame 4 is borne by the roller 5 closest to the conveyor frame 2. Then, the roller 5 furthest from the conveyor frame 2 contacts the car floor, and the roller 5 closest to the conveyor frame 2 begins to tend to leave the guide ramp 7. The responsibility for bearing the weight of the limiting frame 4 begins to transfer from the roller 5 closest to the conveyor frame 2 to the roller 5 furthest from the conveyor frame 2. Finally, all rollers 5 are in contact with the car floor, and all rollers 5 bear the weight of the limiting frame 4. Once the conveyor frame 2 extends to the designated workstation, workers can place items on the conveyor section 3, which is constructed by a non-powered conveyor belt, and then easily push the items into the carriage to complete the main handling work. Finally, workers can stack the items, or unload them from the carriage and output them to the outside via the conveyor section 3. Because the limiting frame 4 is a gantry frame structure, items will pass through the middle area of ​​the limiting frame 4. As needed, a loading structure can be installed on the limiting frame 4 to serve as a temporary storage or buffer during handling.

[0030] The second embodiment of the present invention differs from the first embodiment in that the guide rail arrangement structure between the fixed base and the conveying frame is such that the guide sleeve of the guide rail is disposed on the outside of the fixed base and located on the top of the fixed base, and the linear slide rail is located at the bottom of the conveying frame.

[0031] The third embodiment of the present invention differs from the first embodiment in that the conveying part is composed of universal ball bearings.

[0032] The fourth embodiment of the present invention differs from the first embodiment in that the conveying part is composed of rollers.

[0033] The fifth embodiment of the present invention differs from the first embodiment in that the conveying section is constructed using a motor-driven conveyor belt. An active conveying component is provided on the movable conveying platform, comprising a conveyor belt, pulleys, and a power assembly. The conveyor belt is mounted on the conveying frame via pulleys, and the power assembly is also mounted on the frame. The power assembly consists of a motor and a reducer, and its power output shaft is connected to the shaft of one of the pulleys. The power assembly drives the pulley to rotate the conveyor belt.

[0034] The sixth embodiment of the present invention differs from the first embodiment in that the movable conveyor platform further includes a linear power unit I. The linear power unit I includes a motor, a reducer, a synchronous belt, and pulleys. The synchronous belt is mounted on a fixed base via the pulleys. The motor is connected to the reducer and is also mounted on the fixed base via the reducer. One of the pulleys is connected to the output shaft of the reducer, and the synchronous belt unfolds on the pulley to form an unfolded structure with arc-shaped ends and a straight middle section. The motor, once started, drives the synchronous belt. The straight middle section of the unfolded synchronous belt serves as the power output end of the linear power unit I. The power output end of the linear power unit I is connected to the conveyor frame, and the linear power unit I drives the conveyor frame to move on the fixed base. Compared to the first embodiment, in this embodiment, the conveyor frame can be electrically driven to extend outward or retract inward.

[0035] like Figure 3 As shown, in the seventh embodiment of the present invention, the difference between this embodiment and the fifth embodiment is that the movable conveyor platform is further provided with a linear power unit I 11. The linear power unit I includes a motor, a reducer, a synchronous belt, and pulleys. The synchronous belt is mounted on the fixed base 1 via the pulleys. The motor is connected to the reducer and is mounted on the fixed base 11 via the reducer. One of the pulleys is connected to the output shaft of the reducer, and the synchronous belt unfolds on the pulley to form an unfolded structure with arc-shaped ends and a straight middle section. The motor can drive the synchronous belt to rotate after starting. The straight middle section of the unfolded synchronous belt serves as the power output end of the linear power unit I 11. The power output end of the linear power unit I 11 is connected to the conveyor frame 2, and the linear power unit I 11 drives the conveyor frame 2 to move on the fixed base 1. Compared to the fifth embodiment, in this embodiment, the conveyor frame 2 can be electrically driven to extend outward or retract inward.

[0036] The eighth embodiment of the present invention differs from the first embodiment in that the movable conveying platform further includes an auxiliary frame. The auxiliary frame is also welded from metal and is generally a flat cuboid. The conveying frame and the auxiliary frame are movably connected via guide rails, which include linear slide rails and guide sleeves. The guide sleeves are fixedly installed on the top of the auxiliary frame, and linear slide rails are provided at the bottom of the conveying frame. The conveying frame is movably mounted on the auxiliary frame in a horizontal linear sliding manner by the linear slide rails embedding into the guide sleeves. Both sides of the auxiliary frame are movably connected to a fixed base via guide rails, which also include linear slide rails and guide sleeves. The guide sleeves are fixed to the inner side of the fixed base, and the linear slide rails are fixed horizontally to the outer side of the conveying frame. Thus, the auxiliary frame and the fixed base are movably connected via guide rails, and the auxiliary frame is movably mounted on the fixed base in a horizontal linear sliding manner. The extension range is thus expanded through the structure of the auxiliary frame.

[0037] like Figure 4 As shown, the ninth embodiment of the present invention differs from the eighth embodiment in that the movable conveyor platform is further provided with linear power unit I11 and linear power unit II13.

[0038] The linear power unit I11 includes a motor, a reducer, a synchronous belt, and pulleys. The synchronous belt is mounted on a fixed base 1 via the pulleys. The motor is connected to the reducer and is also mounted on the fixed base 1 via the reducer. One of the pulleys is connected to the output shaft of the reducer. The synchronous belt unfolds on the pulley, forming an arc-shaped structure at both ends and a straight section in the middle. The motor drives the synchronous belt when started. The straight section in the middle of the unfolded synchronous belt serves as the power output end of the linear power unit I11. The power output end of the linear power unit I11 is connected to the auxiliary frame 12, and the linear power unit I11 drives the auxiliary frame 12 to move on the fixed base 1.

[0039] Linear power unit II 13 includes a motor, a reducer, a lead screw, and a lead screw sleeve. The lead screw is mounted on the auxiliary frame 12. The motor is connected to the reducer and is also mounted on the auxiliary frame 12 via the reducer. The output shaft of the reducer is connected to the lead screw. The lead screw sleeve, as the power output end of linear power unit II 13, is fixed to the conveyor frame 2. The lead screw sleeve meshes with the lead screw, and when the motor starts, it can directly drive the conveyor frame 2 to move on the auxiliary frame 12 via the lead screw.

[0040] The tenth embodiment of the present invention differs from the ninth embodiment in that the conveying section is constructed using a motor-driven conveyor belt. An active conveying component is provided on the movable conveying platform, comprising a conveyor belt, pulleys, and a power assembly. The conveyor belt is mounted on the conveying frame via pulleys, and the power assembly is also mounted on the frame. The power assembly consists of a motor and a reducer, and its power output shaft is connected to the shaft of one of the pulleys. The power assembly drives the pulley to rotate the conveyor belt.

Claims

1. An in-carriage conveying device, characterized in that: The in-carriage conveying device includes a movable conveying platform, a limiting frame (4), and a guide seat (6). The movable conveying platform includes a fixed base (1) and a conveying frame (2). The top of the conveying frame (2) is provided with a conveying part (3). The conveying frame (2) is movably mounted on the fixed base (1) in a horizontal linear sliding manner. The direction of movement of the conveying frame (2) on the fixed base (1) is parallel to the conveying direction of the conveying frame (2) in the conveying part (3). The limiting frame (4) is movably connected to the conveying frame (2) through a guide rail. The limiting frame (4) is movably mounted on the conveying frame (2) in a vertical linear sliding manner. The bottom of the limiting frame (4) is provided with rollers (5). The rollers (5) are distributed in a direction parallel to the conveying direction of the conveying part (3). The guide seat (6) is provided with a working... The working surface is located directly below the roller (5). The working surface includes a guide slope (7) and a horizontal support surface (8). The horizontal support surface (8) and the guide slope (7) are distributed along the conveying direction parallel to the conveying part (3). One end of the guide slope (7) is connected to the horizontal support surface (8). The vertical height of one end of the guide slope (7) is higher than the vertical height of the other end of the guide slope (7). The vertical height of the conveying part (3) is higher than the vertical height of the horizontal support surface (8). The limiting frame (4) is movably connected to the guide seat (6) by supporting the roller (5) through the working surface. The departure angle of the roller (5) closest to the conveying frame (2) on the limiting frame (4) is greater than the tilt angle of the guide slope (7) relative to the horizontal plane.

2. The in-carriage conveying device according to claim 1, characterized in that: The guide seat (6) is provided with a protective surface (9) extending in a vertical plane, and the protective surface (9) is connected to the other end of the guide slope (7).

3. The in-carriage conveying device according to claim 1, characterized in that: The length of the horizontal support surface (8) is greater than the maximum center distance between the rollers (5).

4. The in-carriage conveying device according to claim 1, characterized in that: The active conveying platform also includes an active conveying component (10), which includes a conveyor belt, pulleys, and a power component. The conveyor belt is mounted on the conveying frame (2) via pulleys, and the power component is mounted on the conveying frame (2). The conveyor belt is connected to the power component and is driven to operate by the power component.

5. The in-carriage conveying device according to claim 1, characterized in that: The conveying frame (2) is movably connected to the fixed base (1) via a guide rail. The movable conveying platform is equipped with a linear power unit I (11), which is mounted on the fixed base (1). The linear power unit I (11) is equipped with a power output end, which is connected to the conveying frame (2) and drives the conveying frame (2) to move on the fixed base (1).

6. The in-carriage conveying device according to claim 1, characterized in that: The mobile conveying platform also includes an auxiliary frame (12). The conveying frame (2) and the auxiliary frame (12) are movably connected by a guide rail. The conveying frame (2) is movably mounted on the auxiliary frame (12) in a horizontal linear sliding manner. The auxiliary frame (12) and the fixed base (1) are movably connected by a guide rail. The auxiliary frame (12) is movably mounted on the fixed base (1) in a horizontal linear sliding manner.

7. The in-carriage conveying device according to claim 6, characterized in that: The movable conveying platform is provided with a linear power unit I (11) and a linear power unit II (13). The linear power unit I (11) is installed on a fixed base (1) and has a power output end. The power output end of the linear power unit I (11) is connected to an auxiliary frame (12) and the linear power unit I (11) drives the auxiliary frame (12) to move on the fixed base (1). The linear power unit II (13) is installed on the auxiliary frame (12) and has a power output end. The power output end of the linear power unit II (13) is connected to a conveying frame (2) and the linear power unit II (13) drives the conveying frame (2) to move on the auxiliary frame (12).

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