A material transfer device and a door-type dispensing line having the same.

Abstract

This invention relates to the field of automotive manufacturing technology, and provides a material transfer device and a door assembly line having the same. The transfer device includes: a base; a material conveying structure including a material conveying component; a drive structure including a first drive component and a connecting component; and a transfer structure including a transfer component connected to the base. By providing a material conveying structure and a first drive component on both sides of the base, as well as a transfer structure, the transfer structure is adapted to drive the base to move parallel to the direction of movement of the lifting device. The first drive component can drive the material conveying component in the material conveying structure to move along the base, achieving the effect that both the base and the material conveying component can move. During the movement, the material conveying component carries parts of the same model and switches between workstations, while simultaneously moving to the corresponding installation workstation for use by the corresponding personnel to install the parts onto the door, completing the door assembly.

Description

Technical Field

[0001] This invention relates to the field of automobile manufacturing technology, specifically to a material transfer device and a door assembly line having the same. Background Technology

[0002] With the rapid development of the automotive industry, advanced car production lines can often produce a new car in just tens of seconds. In order to ensure that production workers and production lines produce efficiently, the assembly lines of various major components of the vehicle must complete the assembly continuously, effectively and on time. Therefore, the related supply chain, such as logistics and distribution, must also meet the required cycle time to ensure the efficiency of the final assembly line.

[0003] In the process of vehicle assembly, there are many sub-assembly parts for car doors. Currently, the assembly of car doors for different models is carried out by assembling different models of car doors on the same assembly line. However, different models of car doors require different sub-assembly parts. In the existing technology, a workbench is usually placed next to the workers to store the parts corresponding to different models of car doors. When the car door frame is transported to the corresponding work station, the workers install the corresponding parts onto the corresponding car door to complete the assembly.

[0004] However, during the assembly process, because different types of car door parts are placed on the workbench, workers may mistakenly pick up the wrong parts and install them on the car door. Since the parts to be installed at the same workstation are of the same type, only different in model, such as size, especially parts with similar sizes, it is not noticeable to the naked eye. After the car door is installed on the door, it poses a safety hazard when the door is then installed on the whole vehicle. In addition, the workbench is manually transported to the corresponding workstation, which is not efficient and is also very laborious. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the shortcomings of the prior art, in which different models of car door parts are placed on the workbench during the assembly process, and workers may mistakenly pick up the wrong parts during the assembly process, resulting in the incorrect parts being installed on the car door. Since the parts to be installed at the same work station are of the same type, only different in model, such as size, especially parts with similar sizes, it is not noticeable to the naked eye. After the parts are installed on the car door, the car door is then installed on the whole vehicle, which poses a safety hazard. In addition, the workbench is manually transported to the corresponding work station, which is not efficient and is also very laborious. Therefore, the present invention provides a material transfer device and a car door sub-assembly line with the same.

[0006] A material transfer device includes: a base; a material conveying structure including a material conveying component having an installation position suitable for placing materials; a driving structure including a first driving component and a connecting component, the first driving component and the material conveying structure being disposed on opposite sides of the base, the connecting component straddling the base, one end of which is connected to the first driving component and the other end of which is connected to the material conveying component, the first driving component driving the connecting component to drive the material conveying component to reciprocate axially relative to the base, and the direction of movement of the material conveying component being perpendicular to the direction of movement of the lifting device; and a transfer structure including a transfer component connected to the base and driven by a driving force, the transfer component driving the base to move, and the direction of movement of the base being the same as the direction of movement of the lifting device.

[0007] Optionally, in the above-mentioned material transfer device, the conveying component is arranged in the form of a frame, and troughs are symmetrically arranged on the frame. The two troughs are respectively adapted to form the mounting positions, and materials are placed on the troughs.

[0008] Optionally, in the above-mentioned material transfer device, the material conveying structure further includes a balancing joint, the connecting member and the material conveying member are connected through at least one of the balancing joints, one end of each balancing joint is fixedly connected to the connecting member, the other end is movably connected to the frame, and one end of the balancing joint is adapted to move along the frame.

[0009] Optionally, in the above-mentioned material transfer device, the material conveying structure further includes a guiding component, which includes a matching guide member and a guide rail. The guide rail is disposed on the base, and the guide member is correspondingly disposed on the connector. When the connector moves along the base, the guide member reciprocates along the guide rail.

[0010] Optionally, in the above-mentioned material transfer device, the transfer component is arranged in a plate shape;

[0011] The transfer structure further includes a second driving member, which has an opening in it. The second driving member is rotatably disposed relative to the transfer member and drives the transfer member to move.

[0012] Optionally, in the above-mentioned material transfer device, the transfer structure further includes a drive wheel, which is located inside the opening, and the power output end of the second drive member is connected to the drive wheel so that the drive wheel provides driving force to the transfer member.

[0013] Optionally, in the above-mentioned material transfer device, the transfer structure further includes a mounting base, which is located on one side of the opening and is disposed on the transfer member. The mounting base is connected to the second driving member through a rotating part.

[0014] Optionally, in the above-mentioned material transfer device, the transfer structure further includes a tensioning member, which is disposed on the other side of the opening relative to the mounting base, and one end of the rotating part is adapted to be connected to the tensioning member.

[0015] Optionally, in the above-mentioned material transfer device, a waist hole is provided at one end of the rotating part that is connected to the tensioning member, and the waist hole is adapted to be inserted into the tensioning member.

[0016] Optionally, in the above-mentioned material transfer device, at least one auxiliary guide wheel is provided on the conveying component and / or the body of the transfer component, and the moving direction of the auxiliary guide wheel on the conveying component is perpendicular to the moving direction of the auxiliary guide wheel on the transfer component.

[0017] Optionally, in the above-mentioned material transfer device, the material conveying structure further includes a positioning limiter, which is suitable for installation on one side of the workstation and has a limiting channel;

[0018] The frame is also provided with a positioning abutment, one end of which is a pointed end, suitable for insertion into the limiting channel.

[0019] A door assembly line includes:

[0020] A conveyor belt, on which at least two lifting devices are installed;

[0021] A material transfer device, wherein the material transfer device is as described above, and the moving speed of the material conveying component is the same as the moving speed of the conveyor belt;

[0022] The material handling component is adapted to carry materials and move along the base to the space between two adjacent lifting devices, the lifting devices being adapted to lift the vehicle door.

[0023] The technical solution of this invention has the following advantages:

[0024] 1. The present invention provides a material transfer device, comprising: a base; a material conveying structure including a material conveying component having an installation position suitable for placing materials; a driving structure including a first driving component and a connecting component, the first driving component and the material conveying structure being disposed on opposite sides of the base, the connecting component straddling the base, one end of the connecting component being connected to the first driving component and the other end being connected to the material conveying component, the first driving component driving the connecting component to drive the material conveying component to reciprocate axially relative to the base, and the moving direction of the material conveying component being perpendicular to the moving direction of the lifting device; a transfer structure including a transfer component, the transfer component being connected to the base and driven by a driving force, the transfer component driving the base to move, and the moving direction of the base being the same as the moving direction of the lifting device.

[0025] In this material transfer device, a conveying structure, a first driving component, and a transfer structure are arranged on both sides of the base. The transfer structure is suitable for driving the base to move parallel to the direction of movement of the lifting device, and the first driving component can drive the conveying component in the conveying structure to move along the base, achieving the effect that both the base and the conveying component can move. During the movement, the conveying component carries parts of the same model and switches between workstations, while moving to the corresponding installation workstation for use by the corresponding personnel. The parts are then installed onto the door to complete the door assembly. Placing parts of the same model on the same conveying component and being transported to the corresponding workstation by the conveying component can effectively prevent personnel from accidentally placing parts on the wrong side. This system automates the installation of the correct model of parts onto the car door, and automatically drives the base and material handling components, improving production automation, saving manpower and resources. It overcomes the shortcomings of existing technologies where, during door assembly, different models of car door parts are placed on the workbench, leading to workers mistakenly picking up parts and installing the wrong parts onto the door. Since the parts to be installed at the same workstation are of the same type, differing only in model (e.g., size), especially similar-sized parts, the difference is not visually noticeable. After installation on the door, the door is then installed onto the vehicle, posing a safety hazard. Furthermore, the workbench is manually transported to the corresponding workstation, resulting in low manual efficiency and considerable labor.

[0026] 2. The material transfer device provided by the present invention further includes a balancing joint in the material conveying structure. The connecting member is connected to the material conveying member through at least one balancing joint. One end of each balancing joint is fixedly connected to the connecting member, and the other end is movably connected to the frame. One end of the balancing joint is adapted to move along the frame.

[0027] In this material transfer device, a balance joint is installed, with one end fixedly connected to the connector and the other end movably connected to the frame. When the material transport component moves along the base, if it encounters a protruding part on the ground, one end of the balance joint will move relative to the frame, thereby absorbing the imbalance of the ground and preventing the overall structure from tilting. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall structure of the material transfer device provided in the first embodiment of the present invention.

[0030] Figure 2 This is a schematic diagram of the material conveying structure at the unloading position of the base;

[0031] Figure 3 A schematic diagram showing the structure when the abutment component is inserted into the limiting channel;

[0032] Figure 4 A schematic diagram of the positioning limit component;

[0033] Figure 5 A structural diagram of the balancing joint, connecting parts, and material conveying parts;

[0034] Figure 6 This is a schematic diagram showing the positional structure of the second driving component, the tensioning component, and the transfer unit.

[0035] Figure 7 A schematic diagram showing the structure for installing the abutment component at the bottom of the transfer component;

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Base;

[0038] 2. Material conveying structure; 21. Material conveying components; 22. Trough frame; 23. Balancing joint;

[0039] 24. Guide component; 25. Guide rail; 26. Position limiting component; 261. Limiting channel; 27. Positioning abutment component;

[0040] 3. Drive structure; 31. First drive component; 32. Connecting component;

[0041] 4. Transfer structure; 41. Transfer component; 42. Second drive component; 43. Opening; 44. Drive wheel; 45. Mounting base; 46. Tensioning component; 47. Rotating part; 471. Waist hole;

[0042] 5. Auxiliary guide wheel. Detailed Implementation

[0043] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0047] In this invention, one end of the base near the installation station is designated as the unloading position, and the other end of the base is designated as the loading position. Installation is performed at the unloading position, and materials are placed on the conveying device at the loading position.

[0048] Example 1

[0049] This embodiment describes a material transfer device. See [link to documentation]. Figures 1-7 The material transfer device includes a base 1, a conveying structure 2, a drive structure 3, and a transfer structure 4. The conveying structure 2 includes a conveying component 21, on which a mounting position suitable for placing materials is provided. The drive structure 3 includes a first drive component 31 and a connecting component 32. The first drive component 31 and the conveying structure 2 are respectively located on both sides of the base 1, and the connecting component 32 spans across the base 1. One end of the connecting component 32 is connected to the first drive component 31, and the other end is connected to the conveying component 21. The first driving member 31 drives the connecting member 32 to move, thereby enabling the material conveying member 21 to reciprocate axially relative to the base 1. The moving direction of the material conveying member 21 is perpendicular to the moving direction of the lifting device. The transfer structure 4 includes a transfer member 41, which is connected to the base 1. After being driven by a driving force, the transfer member 41 can drive the base 1 to move. During the process of the intermediate member driving the base 1 to move, the moving direction of the base 1 is the same as the moving direction of the lifting device.

[0050] Specifically, by setting up a material conveying structure 2 and a first driving component 31 on both sides of the base 1, and setting up a transfer structure 4, the transfer structure 4 is adapted to drive the base 1 to move parallel to the direction of movement of the lifting device. The first driving component 31 can drive the material conveying component 21 in the material conveying structure 2 to move along the base 1, achieving the effect that both the base 1 and the material conveying component 21 can move. During the movement, the material conveying component 21 carries parts of the same model and switches between workstations, moving to the corresponding installation workstation for use by the corresponding personnel to install the parts onto the door, completing the door assembly. Placing parts of the same model on the same material conveying component 21 and having them transported to the corresponding workstation by the material conveying component 21 can effectively avoid work-related errors. The system automatically drives the base 1 and the material handling component 21, improving production automation, saving manpower and resources. It overcomes the shortcomings of existing technologies where, during door assembly, different door models are placed on the workbench, leading to workers mistakenly picking up parts and installing the wrong ones. Since the parts to be installed at the same workstation are of the same type, differing only in size (e.g., similar sizes), the difference is often imperceptible to the naked eye. After installation on the door, the door is then assembled onto the vehicle, posing a safety hazard. Furthermore, the workbench is manually transported to the corresponding workstation, resulting in low efficiency and considerable labor.

[0051] In this embodiment, the first driving component 31 is a driving cylinder. The power extension end of the driving cylinder is connected to one end of the connecting component 32. The power output end of the cylinder can drive the connecting component 32 to move along the axial direction of the base 1. Under the drive of the connecting component 32, the material conveying component 21 can carry the material from one end of the base 1 to the other end, that is, transport the material to the corresponding installation station of the worker for easy installation. After the parts of one station are installed, the material conveying component 21 returns from the other end to one end of the base 1. Then the base 1 is moved from one station to another by the intermediate component. The connecting component 32 then moves along the base 1 to the station for the worker of another station to install the parts. This cycle is repeated to complete the installation of the same model of car door. It is convenient for the workers to install, has a simple structure, and the various structures work together to efficiently complete the transfer of car door parts between the various stations, thereby enabling the workers to complete the assembly of the car door.

[0052] Specifically, the material conveying component 21 is framed, with one side of the frame connected to the connector 32, and troughs 22 are symmetrically arranged on the frame. The two troughs 22 are adapted to form installation positions, and materials are placed on the corresponding troughs 22.

[0053] In this embodiment, the material conveying structure 2 further includes a balancing joint 23. The connecting member 32 is connected to the material conveying member 21 through at least one balancing joint 23. One end of the balancing joint 23 is fixedly connected to the connecting member 32, and the other end is movably connected to the frame. When the frame moves and encounters a protruding part, the balancing joint 23 and the frame undergo relative displacement, thereby absorbing the imbalance of the ground, thus preventing the overall structure from tilting and preventing materials from falling off the material conveying member 21. In specific applications, the number of balancing joints 23 is set to three.

[0054] Specifically, the connector 32 can be set as a plate, i.e., a connecting plate, and the balance joint 23 can be set as a column. A through hole adapted to the balance joint 23 is opened on the frame. One end of the balance joint 23 passes through the through hole, and the other end is fixedly connected to the connecting plate. The part of the balance joint 23 that extends into the through hole will move downward along the through hole, which can shorten the vertical distance between the connector 32 and the frame. When encountering a recessed area, the part of the balance joint 23 that extends into the through hole will move upward along the through hole, which can increase the vertical distance between the frame and the connector 32. This can absorb the imbalance of the ground, thereby preventing the overall structure from tilting and preventing materials from falling off the conveyor 21.

[0055] In this embodiment, the material conveying structure 2 further includes a guiding component, which includes a matching guide member 24 and a guide rail 25. The guide rail 25 is disposed on the base 1, and the guide member 24 is correspondingly disposed on the connector 32. When the connector 32 moves along the base 1, the guide member 24 reciprocates along the guide rail 25. Specifically, the guide member 24 can be configured as a plurality of sequentially arranged guide grooves. The guide grooves are adapted to the guide rail 25, and the top surface of the guide grooves is fixedly connected to the connector 32. The arrangement of the guide grooves and the guide rail 25 can improve the connection stability between the connector 32 and the base 1, ensuring that the material conveying component 21 can move stably during the movement.

[0056] In the material transfer device of this embodiment, the transfer member 41 can be set as a plate. The transfer structure 4 also includes a second driving member 42 and a driving wheel 44. An opening 43 is opened on the transfer member 41. The second driving member 42 is rotatably arranged relative to the transfer member 41 and can drive the transfer member 41 to move. The driving wheel 44 is located in the opening 43 and the power output end of the second driving member 42 is connected to the driving wheel 44 so that the driving wheel 44 provides driving force to the transfer member 41.

[0057] Specifically, the second driving component 42 can be configured as a drive motor, with its power rotation shaft coaxial with the drive wheel 44. The drive motor drives the drive wheel 44 to rotate, allowing it to move relative to the ground when in contact with it, thereby driving the transfer component 41 to move. The transfer component 41 is connected to the base 1 to move the base 1. During the movement of the drive wheel 44, the direction of its movement is the same as the direction of movement of the lifting device, so that the base 1 and the material conveying component 21 can move in the same direction as the lifting device, achieving the effect of the material conveying component 21 moving at each workstation. The material conveying component 21 can move along the axial direction of the base 1. When it is necessary to install parts, the material conveying component 21 carries the material and moves towards the workstation. In the overall structure, the material conveying component 21 can complete movement in two directions. When the material conveying component 21 moves along the base 1, its direction of movement is perpendicular to the direction of movement of the lifting device.

[0058] In this embodiment, the transfer structure 4 further includes a mounting base 45 and a tensioning member 46. The mounting base 45 is located on one side of the opening 43 and is disposed on the transfer member 41. The mounting base 45 is connected to the second driving member 42 through a rotating part 47. The tensioning member 46 is disposed on the other side of the opening 43 relative to the mounting base 45. When the transfer member 41 needs to be driven by the driving wheel 44, one end of the rotating part 47 is adapted to be connected to the tensioning member 46. When the driving wheel 44 needs to be retracted, the rotating part is disconnected from the tensioning member 46 and rotates relative to the second driving member 42, thereby retracting the second driving member 42.

[0059] Specifically, the tensioning member 46 can be a tensioner, and the rotating part 47 is sleeved on the tensioner. By changing the position of the rotating part 47 relative to the tensioner, the stability of the second driving member 42 on the intermediate member 41 can be changed. A waist hole 471 can be opened at the end of the rotating part 47 that is connected to the tensioning member 46. The waist hole 471 is suitable for insertion into the tensioning member 46.

[0060] In this embodiment, in order to make the material conveying component 21 and the transfer component 41 move more smoothly when they move, at least one auxiliary guide wheel 5 can be provided on the body of the material conveying component 21 and the transfer component 41, wherein the moving direction of the auxiliary guide wheel 5 on the material conveying component 21 is perpendicular to the moving direction of the auxiliary guide wheel 5 on the transfer component 41.

[0061] In this embodiment, to prevent the material conveying component 21 from moving excessively along the base 1, and to prevent the material conveying component 21 from being restricted in its movement after moving to one end of the base 1, a positioning limiter 26 is also provided. The positioning limiter 26 is located on one side of the workstation, near the end of the workstation. The positioning limiter 26 has a limiting channel 261, and a positioning abutment 27 is also provided on the frame. One end of the positioning abutment 27 is a pointed part. After the material conveying component 21 moves from one end of the base 1 to the end near the workstation, the pointed part can be inserted into the limiting channel 261. In actual use, the positioning limiter 26 can be fixed on the ground.

[0062] Specifically, the positioning limit member 26 is open-shaped, and two rotating wheels are arranged inside the positioning limit member 26. A limiting channel is formed between the two rotating wheels for the tip of the positioning abutment member 27 to be inserted. The wheel surfaces of the two rotating wheels are adapted to fit against the two side walls of the tip. After the tip is inserted into the limiting channel, the rotating wheels are driven to rotate.

[0063] In this embodiment, a positioning abutment 27 can also be provided on the transfer component 41. At the same time, a corresponding positioning limiter 26 can be provided on the movement path of the transfer component to limit the transfer component 41 from moving too much on the conveying path of the conveyor belt. In specific settings, the positioning abutment 27 is provided on the end of the transfer component 41 near the loading position.

[0064] Example 2:

[0065] This embodiment describes a door assembly line. See [link to documentation]. Figures 1-7 It includes a conveyor belt (not shown in the figure), on which at least two lifting devices (not shown in the figure) are mounted, wherein the conveyor belt is mounted on a frame and suspended in the air so that the conveyor belt can transport the lifting devices in the air, and a material transfer device, which is the material transfer device described in Embodiment 1, wherein the moving speed of the material conveying component 21 is the same as the moving speed of the conveyor belt, and the material conveying component 21 is adapted to carry materials and move along the base 1 to the space between two adjacent lifting devices, the lifting devices being adapted to lift the vehicle door, and the installation personnel are positioned at the two... The installation of components is carried out between the various lifting devices. During operation, the entire assembly line moves at the same speed as the door lifting device. This ensures that the material transport trolley will not interfere with or collide with the door lifting device during parallel movement, achieving automatic feeding. After the material is delivered, the transfer device automatically returns. Compared with traditional following mechanisms, the following part is placed on the linear guide rail 25. Moreover, this door assembly line is ingeniously designed, simple in structure, economical and practical. Installation only requires fixing the ground guide rail 25, and subsequent maintenance is convenient.

[0066] The working principle of this door assembly line:

[0067] When the material conveyor 21 is in the loading position, after the lifting device is conveyed on the conveyor belt and delivered to the corresponding work station, the second driving component 42 can drive the base 1 to the work station. Then, the first driving component 31 drives the material conveyor 21 to move along the base 1 from the loading position to the unloading position, and completes the installation of the parts at the unloading position.

[0068] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A material transfer device, characterized in that, include: Base (1); Material conveying structure (2), including material conveying component (21), which has a mounting position suitable for placing materials; The drive structure (3) includes a first drive member (31) and a connecting member (32). The first drive member (31) and the material conveying structure (2) are respectively disposed on both sides of the base (1). The connecting member (32) spans the base (1), with one end connected to the first drive member (31) and the other end connected to the material conveying member (21). The first drive member (31) drives the connecting member (32) to drive the material conveying member (21) to reciprocate axially relative to the base (1), and the moving direction of the material conveying member (21) is perpendicular to the moving direction of the lifting device. The transfer structure (4) includes a transfer component (41), which is connected to the base (1) and driven by a driving force. The transfer component (41) drives the base (1) to move, and the direction of movement of the base (1) is the same as the direction of movement of the lifting device. An opening (43) is made on the transfer component (41); The transfer structure (4) also includes a mounting base (45), which is located on one side of the opening (43) and is disposed on the transfer component (41); The transfer structure (4) also includes a tensioning member (46), which is disposed on the other side of the opening (43) relative to the mounting base (45).

2. The material transfer device according to claim 1, characterized in that, The material handling component (21) is framed, and troughs (22) are symmetrically arranged on the frame. The two troughs (22) are respectively adapted to form the mounting positions, and materials are placed on the troughs (22).

3. The material transfer device according to claim 2, characterized in that, The material conveying structure (2) further includes a balance joint (23). The connecting member (32) is connected to the material conveying member (21) through at least one of the balance joints (23). One end of each balance joint (23) is fixedly connected to the connecting member (32), and the other end is movably connected to the frame. One end of the balance joint (23) is adapted to move along the frame.

4. The material transfer device according to claim 3, characterized in that, The material conveying structure (2) also includes a guiding component, which includes a matching guide (24) and a guide rail (25). The guide rail (25) is disposed on the base (1), and the guide (24) is correspondingly disposed on the connector (32). When the connector (32) moves along the base (1), the guide (24) moves back and forth along the guide rail (25).

5. The material transfer device according to claim 3, characterized in that, The transfer component (41) is plate-shaped; The transfer structure (4) further includes a second drive member (42), which is rotatably disposed relative to the transfer member (41) and drives the transfer member (41) to move.

6. The material transfer device according to claim 5, characterized in that, The transfer structure (4) further includes a drive wheel (44), which is located inside the opening (43), and the power output end of the second drive member (42) is connected to the drive wheel (44) so ​​that the drive wheel (44) provides driving force to the transfer member (41).

7. The material transfer device according to claim 6, characterized in that, The mounting base (45) is connected to the second drive member (42) via a rotating part (47).

8. The material transfer device according to claim 7, characterized in that, One end of the rotating part (47) is adapted to be connected to the tensioning member (46).

9. The material transfer device according to claim 8, characterized in that, A waist hole (471) is provided at one end of the rotating part (47) that is connected to the tensioning member (46), and the waist hole (471) is adapted to be inserted into the tensioning member (46).

10. The material transfer device according to claim 7, characterized in that, At least one auxiliary guide wheel (5) is provided on the body of the conveying component (21) and / or the transfer component (41), and the moving direction of the auxiliary guide wheel (5) on the conveying component (21) is perpendicular to the moving direction of the auxiliary guide wheel (5) on the transfer component (41).

11. The material transfer device according to claim 10, characterized in that, The material conveying structure (2) also includes a positioning limiter (26), which is suitable for installation on one side of the workstation and has a limiting channel (261); The frame is also provided with a positioning abutment (27), one end of which is a pointed end, suitable for insertion into the limiting channel (261).

12. A door assembly line, characterized in that, include: A conveyor belt, on which at least two lifting devices are installed; A material transfer device, wherein the material transfer device is as described in any one of claims 1-11, wherein the transfer structure (4) moves synchronously with the conveyor belt, the material handling component (21) is adapted to carry materials and move along the base (1) to the space between two adjacent lifting devices, the lifting device being adapted to lift the vehicle door.

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