A vehicle cab hoist, complete vehicle assembly system and workpiece hoist

Abstract

The application discloses a vehicle cab lifting device, which comprises a bearing frame, a first lifting arm and a second lifting arm. The fixed end of the first lifting arm is fixedly arranged at one end of the bearing frame, and the first bearing end of the first lifting arm is arranged along the horizontal direction and connected with the specified position of the front side of the vehicle cab. The moving end of the second lifting arm is movably arranged at the other end of the bearing frame relative to the fixed end of the first lifting arm, and can be self-adjusted to the corresponding position of the bearing frame according to the length of the vehicle cab. The second bearing end of the second lifting arm is arranged along the horizontal direction relative to the first bearing end, and is connected with the specified position of the rear end of the vehicle cab. The front side and the rear side of the vehicle cab are defined in the length direction of the vehicle cab. The first lifting arm and the second lifting arm are not assembled on the door side of the vehicle cab, so that the first lifting arm and the second lifting arm are not in direct contact with the door, thereby avoiding the deformation of the door or the door bearing frame, eliminating the gap existing after the door is closed, and further improving the body quality.

Description

Technical Field

[0001] This application relates to the field of vehicle assembly technology, specifically to a vehicle cab lifting device, a vehicle assembly system, and a workpiece lifting device. Background Technology

[0002] With the rapid development of the automotive manufacturing industry, various vehicle models and structures have emerged. To meet the demands of vehicle manufacturing, automated vehicle assembly lines have been established by manufacturers. These lines comprise multiple production areas for different production and assembly tasks. In the production and assembly of the vehicle cab, the existing cab hanger attachment points are directly connected to the vehicle door. This affects the door's opening and closing, impacting the internal assembly of the vehicle body. Furthermore, considering the door's inherent strength, this can easily cause deformation of the door or door mounting frame, resulting in gaps after the door closes and affecting the vehicle's overall quality.

[0003] Therefore, how to avoid deformation of the vehicle door or door loading frame when the vehicle cab is mounted on the cab by the cab hoist, which would result in gaps after the door is closed and affect the vehicle body quality, has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] This application provides a vehicle cab lifting device to address the problem in the prior art of preventing door deformation during vehicle cab mounting, which could lead to gaps after door closure and affect vehicle body weight. This application also provides a vehicle assembly system and a workpiece lifting device.

[0005] This application provides a vehicle cab lifting device, including: a support frame, a first boom, and a second boom;

[0006] The fixed end of the first boom is fixedly installed at one end of the support frame. The first bearing end of the first boom is arranged in a horizontal direction and connected to a designated position on the front side of the vehicle cab.

[0007] The movable end of the second boom is movably disposed at the other end of the support frame relative to the fixed end of the first boom, and can be self-adjusted to the corresponding position of the support frame according to the length of the vehicle cab; the second bearing end of the second boom is arranged horizontally relative to the first bearing end and connected to a designated position at the rear end of the vehicle cab; the front and rear sides of the vehicle cab are defined by the length direction of the vehicle cab.

[0008] Optionally, the support frame includes a main support arm and a transfer bracket arranged opposite to each other. The transfer bracket is located on the main support arm at the middle position of the support frame. The transfer bracket includes a main support arm, a secondary support arm, and transfer wheels.

[0009] The main support arm of the bracket is perpendicular to the main support arm and is arranged opposite to it. The secondary support arm of the bracket is connected to the main support arm of the bracket and is arranged parallel to the main support arm. The transfer wheel is arranged on each of the main support arms of the bracket and is used to connect with the sliding track of the vehicle assembly system to drive the carrier frame to the corresponding mounting position in the vehicle cab.

[0010] Optionally, the fixed ends of the first boom are respectively disposed at the ends of the main supports of the support frame that are opposite to each other. The fixed ends of the first boom include a first hanging chain, a first connecting plate and a connecting structure. The first connecting plate is fixedly connected to the ends of the main supports of the support frame through the connecting structure.

[0011] The first connecting plate is connected to the end of the first bearing end via the first hanging chain, so as to connect the fixed end of the first boom to the first bearing end.

[0012] Optionally, the first bearing end includes a first receiving body, a first receiving arm, a first receiving pin, a first force key, and a first operating component;

[0013] The first receiving body is horizontally arranged relative to the width direction of the vehicle cab, and the first receiving arm is arranged on one side of the first receiving body relative to the front side of the vehicle cab; the first receiving arm is configured as two arms, and is distributed at intervals along the width direction of the vehicle cab.

[0014] The first receiving pin is correspondingly and movably disposed at the end of the first receiving arm, and the first force key protrudes from the circumferential end face of the first receiving pin; the end of the first receiving arm is the end of the first receiving arm near the front side of the vehicle cab.

[0015] The first operating component is disposed on the first receiving body away from the first receiving arm. The first operating component is connected to the first receiving pin to drive the first receiving pin to rotate at a corresponding angle.

[0016] Optionally, the first operating component includes a first operating handle, a first connecting shaft, a first reset rod, a first turntable, a first positioning shaft, and a first torsion spring;

[0017] The first operating handle is located on the front side of the first receiving body away from the vehicle cab, and the first operating handle is connected to the first receiving pin through the first connecting shaft.

[0018] The first positioning shaft is disposed at the end of the first receiving body, the first torsion spring is fitted onto the first positioning shaft, and one end of the first torsion spring is connected to the first receiving body, and the other end is connected to the first turntable;

[0019] The first turntable is movably connected to the first positioning shaft. One end of the first reset rod is connected to the first operating handle, and the other end is connected to the first turntable. The first turntable and the first torsion spring drive the first reset rod, so that the first operating handle drives the first receiving pin to the locked position.

[0020] Optionally, the moving end of the second boom includes a drive cylinder, a drive rod, a slide rail, a connecting rod, a second suspension chain, a second connecting plate, and a first pulley block;

[0021] The fixed end of the drive cylinder is fixedly connected to the secondary support arm of the bracket, and the slide rail is disposed on the secondary support arm of the bracket relative to the drive cylinder;

[0022] The drive rod is arranged along the length of the vehicle cab. One end of the drive rod is connected to the output end of the drive cylinder and slides on the slide rail. The other end of the drive rod is connected to the connecting rod.

[0023] The connecting rod is arranged along the width direction of the vehicle cab, and both ends of the connecting rod are respectively connected to the second connecting plate.

[0024] The first pulley block is correspondingly mounted on the second connecting plate and slides in the groove of the main support arm of the support frame, so that the moving end of the second boom slides in the groove of the main support arm of the support frame;

[0025] The second connecting plate is connected to the end of the second bearing end via the second hanging chain, so as to realize the connection between the moving end of the second boom and the second bearing end.

[0026] Optionally, the second bearing end includes a second receiving body, a second receiving arm, a second receiving pin, a second force key, and a second operating component;

[0027] The second receiving body is horizontally arranged relative to the width direction of the vehicle cab, and the second receiving arm is arranged on one side of the second receiving body relative to the rear side of the vehicle cab; the second receiving arm is provided as two arms, and is distributed at intervals along the width direction of the vehicle cab.

[0028] The second receiving pin is correspondingly and movably disposed at the end of the second receiving arm, and the second force key protrudes from the circumferential end face of the second receiving pin; the end of the second receiving arm is the end of the second receiving arm near the rear side of the vehicle cab.

[0029] The second operating component is disposed opposite to the second receiving arm on the second receiving body. The second operating component is connected to the second receiving pin to drive the second receiving pin to rotate at a corresponding angle.

[0030] Optionally, the second operating component includes a second operating handle, a second connecting shaft, a second reset rod, a second turntable, a second positioning shaft, and a second torsion spring;

[0031] The second operating handle is located on the side of the second receiving body away from the rear of the vehicle cab, and the second operating handle is connected to the second receiving pin through the second connecting shaft;

[0032] The second positioning shaft is disposed at the end of the second receiving body, the second torsion spring is fitted onto the second positioning shaft, and one end of the second torsion spring is connected to the second receiving body, and the other end is connected to the second turntable;

[0033] The second turntable is movably connected to the second positioning shaft. One end of the second reset rod is connected to the second operating handle, and the other end is connected to the second turntable. The second turntable and the second torsion spring drive the second reset rod, causing the second operating handle to drive the second receiving pin to the locked position.

[0034] Optionally, it also includes: a balancing assembly, which includes a guide groove, a third connecting plate, a guide wheel assembly, a spring balancing device, and a first connecting ring;

[0035] The guide grooves are disposed opposite to each other at both ends of the support frame, and are located at the ends of the two main support arms of the support frame at each end;

[0036] The guide wheel assembly is mounted on the third connecting plate and is slidably mounted in the guide groove. The guide wheel assembly drives the third connecting plate to slide in the guide groove.

[0037] The spring balancing device is correspondingly connected to the third connecting plate;

[0038] The first connecting rings are respectively disposed at both ends of the first bearing end and both ends of the second bearing end. Each spring balancing device corresponds to each first connecting ring, and the connecting hook of each spring balancing device is hooked to each first connecting ring.

[0039] Optionally, it may also include: a safety component, the safety component comprising a seatbelt hook and a second connecting ring;

[0040] The seat belt hooks are disposed opposite to each other at both ends of the support frame, and are located at the ends of the two main support arms of the support frame at each end;

[0041] The second connecting rings are respectively disposed at both ends of the first bearing end and both ends of the second bearing end, and each of the seat belt hooks corresponds to each of the second connecting rings, and each of the seat belt hooks is hooked to each of the second connecting rings.

[0042] Optionally, it also includes: a fall arrestor, which is movably mounted on the main support arm at the middle position of the support frame along the width direction of the vehicle cab, and supports the left and right side components of the vehicle cab when it moves to a designated position along the length direction of the vehicle cab.

[0043] Optionally, the fall arrestor includes a displacement end, a connecting arm, and a support arm;

[0044] The displacement end is located on the main support arm at the middle position of the support frame, and can be moved to a designated position along the length of the vehicle cab.

[0045] The connecting arms are distributed along the longitudinal direction. One end of the connecting arm is connected to the displacement end so as to move synchronously with the displacement end, and the other end of the connecting arm is connected to the support arm.

[0046] The support arm is arranged in a horizontal direction.

[0047] Optionally, the displacement end includes a fourth connecting plate and a second pulley group;

[0048] The second pulley group is correspondingly installed on the fourth connecting plate and slides into the groove of the main support arm of the support frame, so that the moving end of the fall arrestor slides in the groove of the main support arm of the support frame.

[0049] Optionally, the support arm includes an adjustable screw, a bearing plate, and a buffer plate;

[0050] The first end of the adjustable screw is tunably connected to the other end of the connecting arm, and the second end of the adjustable screw is connected to the bearing plate. The buffer plate is disposed on the upper surface of the bearing plate and is used to support the left and right side components of the vehicle cab.

[0051] Optionally, the adjustable connection between the first end of the adjustable screw and the other end of the connecting arm includes at least one of the following connection methods: threaded connection, pin connection, and snap-fit ​​connection.

[0052] This application also provides a vehicle assembly system, including the vehicle cab lifting device described above.

[0053] This application provides a workpiece lifting device, including: a support frame, a first lifting arm, and a second lifting arm;

[0054] The fixed end of the first boom is fixedly disposed at one end of the support frame, and the first bearing end of the first boom is arranged in a horizontal direction and connected to a designated position on the front side of the workpiece.

[0055] The movable end of the second boom is movably disposed at the other end of the support frame relative to the fixed end of the first boom, and can be self-adjusted to the corresponding position of the support frame according to the length of the workpiece. The second bearing end of the second boom is arranged horizontally relative to the first bearing end and connected to a designated position at the rear end of the workpiece. The front and rear sides of the workpiece are defined by the length direction of the workpiece.

[0056] Compared with the prior art, this application has the following advantages:

[0057] This application provides a vehicle cab lifting device, comprising: a support frame, a first boom, and a second boom; the fixed end of the first boom is fixedly disposed at one end of the support frame, the first bearing end of the first boom is arranged horizontally and connected to a designated position on the front side of the vehicle cab; the movable end of the second boom is movably disposed at the other end of the support frame relative to the fixed end of the first boom, and can be self-adjusted to a corresponding position on the support frame according to the length of the vehicle cab, the second bearing end of the second boom is arranged horizontally relative to the first bearing end and connected to a designated position at the rear end of the vehicle cab; the front and rear sides of the vehicle cab are defined by the length direction of the vehicle cab. In this embodiment, the first boom and the second boom are not assembled to the door side of the vehicle cab, thus preventing direct contact between the first boom and the second boom and the door loading frame, thereby avoiding deformation of the door or door loading frame, eliminating gaps after the door is closed, and improving the vehicle body weight. In addition, by setting the second boom as a movable structure, the lifting requirements of vehicle cabs of different lengths can be met, thus allowing the vehicle cab lifting device to be applied to the transportation of different vehicle models. Attached Figure Description

[0058] Figure 1 This is a structural schematic diagram of the vehicle cab lifting device provided in the embodiments of this application.

[0059] Figure 2 This is a schematic diagram of the support frame provided in an embodiment of this application.

[0060] Figure 3 for Figure 1 Enlarged view of point A in the middle.

[0061] Figure 4 A schematic diagram of the structure of the fall protection device provided in the embodiments of this application.

[0062] Figure 5A schematic diagram of the structure of the first bearing end of the first boom provided in an embodiment of this application.

[0063] Figure 6 A schematic diagram of the structure of the first bearing end of the second boom provided in an embodiment of this application.

[0064] Figure 7 This is a schematic diagram of the structure of the vehicle cab hoisting device for mounting the vehicle cab provided in the embodiments of this application.

[0065] Reference numerals: 100 for vehicle cab lifting device, 200 for vehicle cab, 10 for support frame, 101 for main boom, 102 for auxiliary boom, 103 for slide rail, 104 for main support arm of bracket, 105 for secondary support arm of bracket, 106 for transfer wheel, 1 for first boom, 2 for fixed end, 21 for first hanging chain, 22 for first connecting plate, 23 for connecting structure, 24 for third pulley block, 25 for first protective sleeve, 3 for first bearing end, 31 for first receiving body, 32 for first receiving arm, 33 for first receiving pin. 33, First force key; 34, First operating component; 35, First operating handle; 351, First connecting shaft; 352, First reset rod; 353, First connecting rod; 3531, Second connecting rod; 3532, Third connecting rod; 3533, First turntable; 354, First positioning shaft; 355, First torsion spring; 356, First rotating shaft; 357, Second boom; 4, Moving end; 5, Drive cylinder; 51, Drive rod; 52, Slide rail; 53, Connecting rod; 54, Second hanging chain; 55, Second connecting plate. 56, first pulley block, 57, second protective sleeve, 58, second bearing end, 6, second receiving body, 61, second receiving arm, 62, second receiving pin, 63, second force key, 64, second operating component, 65, second operating handle, 651, second connecting shaft, 652, second reset rod, 653, fourth connecting rod, 6531, fifth connecting rod, 6532, sixth connecting rod, 6533, second turntable, 654, second positioning shaft, 655, second torsion spring, 656, second rotating shaft, 657. Balance assembly 7, guide groove 71, first groove wall 711, second groove wall 712, third connecting plate 72, guide wheel assembly 73, spring balancing device 74, connecting hook 741, first connecting ring 75, safety assembly 8, safety belt hook 81, second connecting ring 82, fall arrestor 9, displacement end 91, fourth connecting plate 911, second pulley assembly 912, connecting arm 92, support arm 93, adjustable screw 931, bearing plate 932, buffer plate 933. Detailed Implementation

[0066] To enable those skilled in the art to better understand the purpose, technical solutions, and advantages of the embodiments of this application, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, and not all embodiments.

[0067] It should be further clarified that the terminology used in the specification, claims, and accompanying drawings of this application, such as referring to an element as being "on" or "connected" to another element, means that the element may be directly on or connected to another element, or that there may be intermediate elements. In contrast, when an element is referred to as being "directly" on or "directly connected" to another element, there will be no intermediate elements.

[0068] In the embodiments of this application, the terms "first," "second," "third," etc., are used to distinguish similar objects and are not used to describe a specific order or sequence. Such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in an order other than that shown in the figures or descriptions herein. Furthermore, terms such as "comprising," "including," and "containing" indicate the presence of the claimed feature but do not exclude one or more other features. Spatial relationship terms such as "above," "below," "left," "right," "front," and "back" indicate the spatial positional relationship between one feature and another in the figures. It should be understood that spatial relationship terms include not only the orientation shown in the figures but also different orientations of the device during use or operation. For example, when the device in the figures is reversed, a feature previously described as "below" its feature can now be described as "above" its feature.

[0069] First Embodiment

[0070] This application provides a vehicle cab lifting device to address the problem in the prior art of preventing deformation of the vehicle door or door loading frame when mounting the vehicle cab, which could lead to gaps after the door is closed and affect the vehicle body weight. This application also provides a vehicle assembly system and a workpiece lifting device.

[0071] Figure 1 This is a structural schematic diagram of the vehicle cab lifting device provided in the embodiments of this application. Figure 2 This is a schematic diagram of the support frame provided in an embodiment of this application. Figure 3 for Figure 1 Enlarged view of point A in the middle. Figure 4 This is a schematic diagram of the structure of the fall protection device provided in the embodiments of this application. Figure 5 A schematic diagram of the structure of the first bearing end of the first boom provided in an embodiment of this application. Figure 6 A schematic diagram of the structure of the first bearing end of the second boom provided in an embodiment of this application. Figure 7 This is a schematic diagram of the structure of the vehicle cab hoisting device for mounting the vehicle cab provided in the embodiments of this application.

[0072] like Figures 1 to 7As shown, this application embodiment provides a vehicle cab hoist 100, including: a support frame 10, a first boom 1, and a second boom 4. The fixed end 2 of the first boom 1 is fixedly disposed at one end of the support frame 10. The first bearing end 3 of the first boom 1 is arranged horizontally and connected to a designated position on the front side of the vehicle cab 200. The movable end 5 of the second boom 4 is movably disposed at the other end of the support frame 10 relative to the fixed end 2 of the first boom 1, and can be self-adjusted to a corresponding position on the support frame 10 according to the length of the vehicle cab 200. The second bearing end 6 of the second boom 4 is arranged horizontally relative to the first bearing end 3 and connected to a designated position on the rear side of the vehicle cab 200. Under the support of the support frame 10, the first boom 1 and the second boom 4 can load the vehicle cab 200. The front and rear sides of the vehicle cab 200 are defined by the length direction of the vehicle cab 200. Figure 7 As shown, the length direction of the vehicle cab 200 is indicated by the arrow. A windshield can be installed at a position on the front side of the vehicle cab 200, and correspondingly, left and right doors can be installed at a position on the left or right side of the vehicle cab 200. In this embodiment, the first boom 1 and the second boom 4 are not mounted on the door side of the vehicle cab 200, thus preventing the first boom 1 and the second boom 4 from directly contacting the door or door loading rack, thereby avoiding deformation of the door or door loading rack, eliminating gaps after the door is closed, and improving the vehicle body weight.

[0073] The specific structures of the support frame 10, the first boom 1, and the second boom 4 will be described below:

[0074] In this embodiment, the support frame 10 is generally a cuboid frame, including main support arms 101 arranged opposite each other along the length direction, and secondary support arms arranged along the width direction connecting the main support arms 101. Two main support arms 101 and two secondary support arms 102 are each provided, connected end-to-end to form the main frame of the support frame 10. In addition, the main support arms 101 are provided with sliding grooves along their length edges. Taking the main support arms 101 as the main body, the sliding grooves 103 can be divided into upper sliding grooves located at the upper edge of the main support arms 101 and lower sliding grooves located at the lower edge of the main support arms 101. The upper end of the secondary support arms 102 is provided with a groove structure. The support frame 10 also includes a transfer bracket located in the middle of the main frame. The transfer bracket includes a main support arm 104, a secondary support arm 105, and transfer wheels 106. In this configuration, the main support arm 104 is parallel to and opposite to the secondary support arm 102, while the secondary support arm 105 is connected to the main support arm 104 and parallel to the main support arm 101. Transfer wheels 106 are mounted on each main support arm 104 and connect to the sliding rails of the vehicle assembly system to move the support frame 10 to the corresponding mounting position on the vehicle cab 200. After moving to the designated mounting position, the transfer support ensures the stability of the vehicle cab lifting device 100 during assembly. In this embodiment, the transfer wheels 106 are located at the ends of each main support arm 104.

[0075] In this embodiment, the fixed end 2 of the first boom 1 is fixedly disposed at one end of the support frame 10. Specifically, one end of the support frame 10 is the respective and opposite ends of two parallel main supports 101. That is, the fixed end 2 of the first boom 1 is respectively disposed at the ends of the oppositely disposed main supports 101 of the support frame 10. The fixed end 2 of the first boom 1 includes a first hanging chain 21, a first connecting plate 22, and a connecting structure 23. The first connecting plate 22 is fixedly connected to the end of the main supports 101 of the support frame 10 through the connecting structure 23. The connecting structure 23 includes bolts and threaded holes. The threaded holes are respectively disposed opposite to the end of the main supports 101 of the support frame 10 and the first connecting plate 22. The bolts are screwed into the threaded holes to fix the first connecting plate 22 to the end of the main supports 101 of the support frame 10.

[0076] It should be noted that, in this embodiment, the fixed end 2 of the first boom 1 further includes a third pulley group 24. The third pulley group 24 includes multiple third pulleys, each of which is connected in series with each bolt and slides in the groove 103 of the main support arm 101. That is, in one example, the third pulley group 24 can drive the first connecting plate 22 to move to a designated position of the main support arm 101, and at that designated position, it is fixedly connected to the main support arm 101 through the connecting structure 23. When it is necessary to change to another designated position, the third pulley group 24 can drive the first connecting plate 22 to move to another designated position of the main support arm 101, and at that other designated position, it is fixedly connected to the main support arm 101 through the connecting structure 23, so that the fixed end 2 of the first boom 1 is in a fixed state. In this embodiment, the fixed end 2 of the first boom 1 is preferably presented in a fixed state. The first connecting plate 22 is connected to the end of the first bearing end 3 through the first hanging chain 21 to realize the connection between the fixed end 2 of the first boom 1 and the first bearing end 3. At this point, the third pulley group 24 only serves a load-bearing function. The purpose of setting up the third pulley group is to prevent the first connecting plate 22 from tipping over in the slide groove 103. In this embodiment, in order to increase the protection of the first hanging chain 21, a first protective sleeve 25 is also provided on the outside of the first hanging chain 21, that is, most of the first hanging chain 21 is fitted into the first protective sleeve 25.

[0077] In the first embodiment of this application, the first bearing end 3 of the first boom 1 includes a first receiving body 31, a first receiving arm 32, a first receiving pin 33, a first force-bearing key 34, and a first operating component 35. The first receiving body 31 is horizontally positioned relative to the width direction of the vehicle cab 200. The first receiving arm 32 is located on one side of the first receiving body 31 relative to the front of the vehicle cab 200. Two first receiving arms 32 are provided and spaced apart along the width direction of the vehicle cab 200. In this embodiment, the first receiving arm 32 is fixedly connected to the side of the first receiving body 31 relative to the front of the vehicle cab 200. In other embodiments, the first receiving arm 32 is slidably connected to the side of the first receiving body 31 relative to the front of the vehicle cab 200. By making the first receiving arm 32 a slidable structure, it is possible to support the cab 200 of different vehicle models (mainly through the support of the first receiving pin 33 located at the end of the first receiving arm 32). The first receiving pin 33 is movably disposed at the end of the first receiving arm 32. The first receiving pin 33 can be inserted into a pin hole in the front structure of the vehicle cab 200 to achieve receiving of the front side of the vehicle cab 200. The first force key 34 protrudes from the circumferential end face of the first receiving pin 33 and is used to limit the circumferential rotation of the vehicle cab 200 relative to the first bearing end 3 of the first boom 1. The end of the first receiving arm 32 is the end of the first receiving arm 32 near the front side of the vehicle cab 200. The first operating component 35 is disposed opposite to the first receiving arm 32 on the first receiving body 31. Two first operating components 35 are provided, and the first operating components 35 are connected to the first receiving pin 33 to drive the first receiving pin 33 to rotate by a corresponding angle.

[0078] Specifically, in this embodiment, the first operating component 35 includes a first operating handle 351, a first connecting shaft 352, a first reset rod 353, a first turntable 354, a first positioning shaft 355, and a first torsion spring 356. The first operating handle 351 is located on the front side of the first receiving body 31 away from the vehicle cab 200, and is connected to the first receiving pin 33 via the first connecting shaft 352. The first positioning shaft 355 is located at the end of the first receiving body 31, and the first torsion spring 356 is fitted onto the first positioning shaft 355, with one end of the first torsion spring 356 connected to the first receiving body 31 and the other end connected to the first turntable 354. The first turntable 354 is movably connected to the first positioning shaft 355, and one end of the first reset rod 353 is connected to the first operating handle 351, while the other end is connected to the first turntable 354. The first turntable 354 and the first torsion spring 356 drive the first reset rod 353, causing the first operating handle 351 to engage the first receiving pin 33 in the locked position. When it is necessary to rotate the first receiving pin 33 to unlock it, the first operating handle 351 is manually driven to rotate the first receiving pin 33, causing the first force key 34 on the circumferential end face of the first receiving pin 33 to rotate synchronously with the first receiving pin 33. Alternatively, when the first receiving pin 33 is inserted into the pin hole in the front structure of the vehicle cab 200, the first operating handle 351 can be manually driven to rotate the first receiving pin 33. After the first receiving pin 33 rotates the first force key 34 on the circumferential end face by a specified angle, the control of the first operating handle 351 is released, and the first turntable 354 and the first torsion spring 356 drive the first reset rod 353, causing the first operating handle 351 to engage the first receiving pin 33 in the locked position. Of course, in other embodiments, the first operating component 35 also includes a drive cylinder (not shown). Two drive cylinders are provided, correspondingly disposed on the first receiving body 31 and located on the first operating handle 351, and connected to the first operating handle 351. The drive cylinder can drive the first operating handle 351 to drive the first receiving pin 33 to rotate automatically.

[0079] It should be added that, in the embodiments of this application, the first reset rod 353 includes a first connecting rod 3531, a second connecting rod 3532 and a third connecting rod 3533. One end of the first connecting rod 3531 is connected to the first operating handle 351, and the other end is connected to one end of the second connecting rod 3532. The second connecting rod 3532 is mounted on the first receiving body 31 via a first rotating shaft 357 so as to rotate with the first rotating shaft 357. The other end of the second connecting rod 3532 is connected to one end of the third connecting rod 3533, and the other end of the third connecting rod 3533 is connected to the first turntable 354.

[0080] In this embodiment, the movable end 5 of the second boom 4 is movably disposed at the other end of the support frame 10. Specifically, the other end of the support frame 10 is the opposite end of each of the two parallel main supports 101. That is, the movable end 5 of the second boom 4 is disposed on the opposite main supports 101 of the support frame 10. The movable end 5 of the second boom 4 includes a drive cylinder 51, a drive rod 52, a slide rail 53, a connecting rod 54, a second suspension chain 55, a second connecting plate 56, and a first pulley group 57. The fixed end of the drive cylinder 51 is fixedly connected to the secondary support arm 105 of the support frame 10 at its middle position. The slide rail 53 is disposed on the secondary support arm 105 of the support frame 10 at its middle position relative to the drive cylinder 51. The drive rod 52 is disposed along the length of the vehicle cab 200. One end of the drive rod 52 is connected to the output end of the drive cylinder 51 and slides on the slide rail 53. The other end of the drive rod 52 is connected to the connecting rod 54. The output end of the drive cylinder 51 drives the drive rod 52 to slide on the slide rail 53, so that the drive rod 52 drives the connecting rod 54 to move. The connecting rod 54 is arranged along the width direction of the vehicle cab 200, and is parallel to the auxiliary support arm 102. The two ends of the connecting rod 54 are respectively connected to the second connecting plate 56. The first pulley group 57 is correspondingly arranged on the second connecting plate 56 and slides in the slide groove 103 of the main support arm 101 of the support frame 10, so that the moving end 5 of the second boom 4 slides in the slide groove 103 of the main support arm 101 of the support frame 10. The first pulley group 57 includes a plurality of first pulleys.

[0081] The second connecting plate 56 is connected to the end of the second bearing end 6 via the second hanging chain 55, thereby connecting the moving end 5 of the second boom 4 to the second bearing end 6. The connecting rod 54 can drive the second connecting plate 56 to move, thereby causing the first pulley group 57 to drive the second connecting plate 56 to slide in the slide groove 103 of the main support arm 101 of the support frame 10, which in turn causes the second connecting plate 56 to drive the second hanging chain 55 to move the second bearing end 6 synchronously. By setting the second boom 4 as a movable structure, the hanging requirements of vehicle cabs 200 of different lengths can be met. In addition, in order to increase the protection of the second hanging chain 55, a second protective sleeve 58 is also provided on the outside of the second hanging chain 55, that is, most of the second hanging chain 55 is fitted into the second protective sleeve 58.

[0082] In the first embodiment of this application, the second bearing end 6 includes a second receiving body 61, a second receiving arm 62, a second receiving pin 63, a second force-receiving key 64, and a second operating component 65. The second receiving body 61 is horizontally positioned relative to the width direction of the vehicle cab 200. The second receiving arm 62 is located on one side of the second receiving body 61 relative to the rear side of the vehicle cab 200. Two second receiving arms 62 are provided and spaced apart along the width direction of the vehicle cab 200. In this embodiment, the second receiving arm 62 is fixedly connected to the side of the second receiving body 61 relative to the rear side of the vehicle cab 200. In other embodiments, the second receiving arm 62 is slidably connected to the side of the second receiving body 61 relative to the rear side of the vehicle cab 200. By making the second receiving arm 62 a slidable structure, it is possible to bear the load of the vehicle cab 200 of different vehicle models (mainly through the second receiving pin 63 located at the end of the second receiving arm 62). The second receiving pin 63 is movably disposed at the end of the second receiving arm 62. The second receiving pin 63 can be inserted into a pin hole in the rear structure of the vehicle cab 200 to achieve support for the rear of the vehicle cab 200. The second force key 64 protrudes from the circumferential end face of the second receiving pin 63 and is used to limit the circumferential rotation of the vehicle cab 200 relative to the second bearing end 6 of the second boom 4. The end of the second receiving arm 62 is the end of the second receiving arm 62 near the rear of the vehicle cab 200. Two second operating components 65 are disposed opposite to the second receiving arm 62 on the second receiving body 61. The second operating components 65 are connected to the second receiving pin 63 to drive the second receiving pin 63 to rotate by a corresponding angle.

[0083] Specifically, in this embodiment, the second operating component 65 includes a second operating handle 651, a second connecting shaft 652, a second reset rod 653, a second turntable 654, a second positioning shaft 655, and a second torsion spring 656. The second operating handle 651 is located on the side of the second receiving body 61 opposite to the rear of the vehicle cab 200, and is connected to the second receiving pin 63 via the second connecting shaft 652. The second positioning shaft 655 is located at the end of the second receiving body 61, and the second torsion spring 656 is fitted onto the second positioning shaft 655, with one end connected to the second receiving body 61 and the other end connected to the second turntable 654. The second turntable 654 is movably connected to the second positioning shaft 655, and one end of the second reset rod 653 is connected to the second operating handle 651, while the other end is connected to the second turntable 654. The second turntable 654 and the second torsion spring 656 drive the second reset rod 653, causing the second operating handle 651 to engage the second receiving pin 63 in the locked position. When it is necessary to rotate the second receiving pin 63 to unlock it, the second operating handle 651 is manually driven to rotate the second receiving pin 63, causing the second force key 64 on the circumferential end face of the second receiving pin 63 to rotate synchronously with the second receiving pin 63. Alternatively, when the second receiving pin 63 is inserted into the pin hole in the rear structure of the vehicle cab 200, the second operating handle 651 can be manually driven to rotate the second receiving pin 63. After the second receiving pin 63 rotates the second force key 64 on its circumferential end face by a specified angle, the control of the second operating handle 651 is released, and the second turntable 654 and the second torsion spring 656 drive the second reset rod 653, causing the second operating handle 651 to engage the second receiving pin 63 in the locked position. Of course, in other embodiments, the second operating component 65 also includes a drive cylinder (not shown). Two drive cylinders are provided, correspondingly disposed on the second receiving body 61 and located on the second operating handle 651, and connected to the second operating handle 651. The drive cylinder can drive the second operating handle 651 to drive the second receiving pin 63 to rotate automatically.

[0084] It should be added that, in this embodiment of the application, the second reset rod 653 includes a fourth link 6531, a fifth link 6532 and a sixth link 6533. One end of the fourth link 6531 is connected to the second operating handle 651, and the other end is connected to one end of the fifth link 6532. The fifth link 6532 is mounted on the second receiving body 61 via the second rotating shaft 657 so as to rotate with the second rotating shaft 657. The other end of the fifth link 6532 is connected to one end of the sixth link 6533, and the other end of the sixth link 6533 is connected to the second turntable 654.

[0085] In this embodiment of the application, the first bearing end 3 of the first boom 1 and the second bearing end 6 of the second boom 4 are arranged opposite to each other. When the first receiving pin 33 is inserted into the pin hole in the front structure of the vehicle cab 200 and the second receiving pin 63 is inserted into the pin hole in the rear structure of the vehicle cab 200, it not only supports the vehicle cab 200 but also limits the vehicle cab 200 in the axial direction.

[0086] In this embodiment, to improve the stability of the first bearing end 3 of the first boom 1 and the second bearing end 6 of the second boom 4, a safety component 8 is further included. The safety component 8 includes safety belt hooks 81 and second connecting rings 82. The safety belt hooks 81 are disposed opposite to each end of the support frame 10, and are located at the ends of the two main support arms 101 of the support frame 10 at each end; that is, four safety belt hooks 81 are provided. The second connecting rings 82 are respectively disposed at both ends of the first bearing end 3 and the second bearing end 6, with each safety belt hook 81 corresponding to each second connecting ring 82, and each safety belt hook 81 being engaged with each second connecting ring 82. Four second connecting rings 82 are also provided. Of course, in other embodiments, the number of safety belt hooks 81 and second connecting rings 82 can also be other.

[0087] In addition, to prevent the vehicle cab 200 from falling during transport by the vehicle cab spreader 100, a fall arrestor 9 is also included. The fall arrestor 9 is movably mounted on the main support arm 101 at the middle position of the support frame along the width direction of the vehicle cab 200. That is, two fall arrestors 9 are provided. In other examples, four or other numbers of fall arrestors 9 can also be provided; the limitation on the number does not affect the protection range of the fall arrestor 9. The fall arrestor 9 can be moved along the length direction of the vehicle cab 200 to a designated position to support the left and right side components of the vehicle cab 200.

[0088] Specifically, the fall arrestor includes a displacement end 91, a connecting arm 92, and a support arm 93. The displacement end 91 is movably mounted on the main support arm 101 at the middle position of the support frame and can move to a designated position along the length of the vehicle cab 200. The connecting arm 92 is distributed longitudinally, with one end connected to the displacement end 91 to move synchronously with it, and the other end connected to the support arm 93, which is arranged horizontally. Further, the displacement end 91 includes a fourth connecting plate 911 and a second pulley assembly 912. The second pulley assembly 912 is correspondingly mounted on the fourth connecting plate 911 and slides into the groove 103 of the main support arm 101 of the support frame 10, allowing the moving end 5 of the fall arrestor 9 to slide within the groove 103 of the main support arm 101 of the support frame 10. The support arm 93 includes an adjustable screw 931, a support plate 932, and a buffer plate 933. The first end of the adjustable screw 931 is adjustablely connected to the other end of the connecting arm 92, and the second end of the adjustable screw 931 is connected to the support plate 932. The buffer plate 933 is disposed on the upper surface of the support plate 932 and is used to support components on the left and right sides of the vehicle cab 200. In this embodiment, the adjustable connection between the first end of the adjustable screw 931 and the other end of the connecting arm 92 includes at least one of the following connection methods: threaded connection, pin connection, or snap-fit ​​connection.

[0089] Furthermore, in this embodiment, to facilitate labor-saving operation, a balancing component 7 is also included. The balancing component 7 includes a guide groove 71, a third connecting plate 72, a guide wheel assembly 73, a spring balancing device 74, and a first connecting ring 75. Specifically, the guide groove 71 is disposed opposite to both ends of the support frame 10, and is located at the ends of the two main support arms 101 of the support frame 10 at each end. Four guide grooves 71 are provided, and each guide groove 71 includes a first groove wall 711 and a second groove wall 712 disposed opposite to each other. The first groove wall 711 and the second groove wall 712 are respectively disposed at the upper and lower edges of the main support arm 101. The walls of the first groove wall 711 and the second groove wall 712 are respectively configured as slopes, and the lower end of the first groove wall 711 is opposite to the upper end of the second groove wall 712, and the upper end of the first groove wall 711 is opposite to the lower end of the second groove wall 712, so that the guide groove 71 formed by the first groove wall 711 and the second groove wall 712 has a slope. In this embodiment, the lower end of the first groove wall 711 and the upper end of the second groove wall 712 are located near the end of the support arm, so that the guide wheel assembly 73 slides from the end of the support arm along the guide groove 71 from low to high. The guide wheel assembly 73 is mounted on the third connecting plate 72 and correspondingly slidably mounted in the guide groove 71. The guide wheel assembly 73 drives the third connecting plate 72 to slide in the guide groove 71. The guide wheel assembly 73 includes multiple guide wheels. The spring balancing device 74 is correspondingly connected to the third connecting plate 72 via a chain. There are four spring balancing devices 74. The first connecting rings 75 are respectively mounted at both ends of the first bearing end 3 and both ends of the second bearing end 6. The first connecting rings 75 are located on the side of the second connecting ring 82. Each spring balancing device 74 corresponds to each first connecting ring 75, and the connecting hook 741 of each spring balancing device 74 is hooked to each first connecting ring 75. The pull rope connecting the connecting hook 741 is wound around a spool inside the spring balance device 74. The spool is connected to a coil spring, which allows the pull rope to drive the connecting hook 741 back to the spring balance device 74.

[0090] This application provides a vehicle cab lifting device 100, including: a support frame 10, a first boom 1, and a second boom 4; the fixed end 2 of the first boom 1 is fixedly disposed at one end of the support frame 10, the first bearing end 3 of the first boom 1 is arranged horizontally and connected to a designated position on the front side of the vehicle cab 200; the movable end 5 of the second boom 4 is movably disposed at the other end of the support frame 10 relative to the fixed end 2 of the first boom 1, and can be self-adjusted to a corresponding position on the support frame 10 according to the length of the vehicle cab 200; the second bearing end 6 of the second boom 4 is arranged horizontally relative to the first bearing end 3 and connected to a designated position at the rear end of the vehicle cab 200; the front and rear sides of the vehicle cab 200 are defined by the length direction of the vehicle cab 200. In this embodiment, the first boom 1 and the second boom 4 are not mounted on the door side of the vehicle cab 200. This prevents the first boom 1 and the second boom 4 from directly contacting the door or door loading rack, thereby avoiding deformation of the door or door loading rack, eliminating gaps after the door is closed, and improving vehicle weight. Furthermore, by configuring the second boom 4 as a movable structure, it can meet the lifting requirements of vehicle cabs 200 of different lengths, thus allowing the vehicle cab lifting device 100 to be applied to the transportation of different vehicle models.

[0091] Second Embodiment

[0092] This application also provides a vehicle assembly system (not shown), which includes the contents of the vehicle cab hoist 100 described in the first embodiment above, and will not be repeated here.

[0093] Third Embodiment

[0094] This application embodiment also provides a workpiece lifting device, characterized in that it includes: a support frame 10, a first lifting arm 1, and a second lifting arm 4; the fixed end 2 of the first lifting arm 1 is fixedly disposed at one end of the support frame 10, the first bearing end 3 of the first lifting arm 1 is arranged horizontally and connected to a designated position on the front side of the workpiece; the movable end 5 of the second lifting arm 4 is movably disposed at the other end of the support frame 10 relative to the fixed end 2 of the first lifting arm 1, and can be self-adjusted to a corresponding position on the support frame 10 according to the length of the workpiece, the second bearing end 6 of the second lifting arm 4 is arranged horizontally relative to the first bearing end 3 and connected to a designated position on the rear end of the workpiece; the front and rear sides of the workpiece are defined by the length direction of the workpiece. Further, for the specific structure of the support frame 10, the first lifting arm 1, and the second lifting arm 4, please refer to the description of the support frame 10, the first lifting arm 1, and the second lifting arm 4 in the first embodiment above, which will not be repeated here.

[0095] The above description is merely a preferred embodiment disclosed in this application, but the scope of protection of this application is not limited thereto. Any possible changes and modifications can be made by those skilled in the art without departing from the spirit and scope of this application, and all such changes and modifications are within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection defined in the claims of this application.

Claims

1. A vehicle cab lifting device, characterized in that, include: Support frame, first boom and second boom; The fixed end of the first boom is fixedly installed at one end of the support frame. The first bearing end of the first boom is arranged in a horizontal direction and connected to a designated position on the front side of the vehicle cab. The movable end of the second boom is movably disposed at the other end of the support frame relative to the fixed end of the first boom, and can be automatically adjusted to the corresponding position of the support frame according to the length of the vehicle cab; the second bearing end of the second boom is arranged horizontally relative to the first bearing end and connected to a designated position at the rear end of the vehicle cab; the front and rear sides of the vehicle cab are defined by the length direction of the vehicle cab. The first bearing end includes a first receiving body, a first receiving arm, a first receiving pin, a first force-bearing key, and a first operating component; The first receiving body is horizontally arranged relative to the width direction of the vehicle cab, and the first receiving arm is arranged on one side of the first receiving body relative to the front side of the vehicle cab; the first receiving arm is configured as two arms, and is distributed at intervals along the width direction of the vehicle cab. The first receiving pin is correspondingly and movably disposed at the end of the first receiving arm, and the first force key protrudes from the circumferential end face of the first receiving pin; the end of the first receiving arm is the end of the first receiving arm near the front side of the vehicle cab. The first operating component is disposed on the first receiving body away from the first receiving arm. The first operating component is connected to the first receiving pin so as to drive the first receiving pin to rotate at a corresponding angle. The support frame includes a main support arm and a transfer support that are arranged opposite to each other. The transfer support is located on the main support arm at the middle position of the support frame. The transfer support includes a main support arm, a secondary support arm, and transfer wheels. The main support arm of the bracket is perpendicular to the main support arm and is arranged opposite to it. The secondary support arm of the bracket is connected to the main support arm of the bracket and is arranged parallel to the main support arm. The transfer wheel is arranged on each of the main support arms of the bracket and is used to connect with the sliding track of the vehicle assembly system to drive the carrier frame to the corresponding mounting position in the vehicle cab.

2. The vehicle cab lifting device according to claim 1, characterized in that, The fixed ends of the first boom are respectively located at the ends of the main supports of the support frame that are opposite to each other. The fixed ends of the first boom include a first hanging chain, a first connecting plate and a connecting structure. The first connecting plate is fixedly connected to the ends of the main supports of the support frame through the connecting structure. The first connecting plate is connected to the end of the first bearing end via the first hanging chain, so as to connect the fixed end of the first boom to the first bearing end.

3. The vehicle cab lifting device according to claim 1, characterized in that, The first operating component includes a first operating handle, a first connecting shaft, a first reset rod, a first turntable, a first positioning shaft, and a first torsion spring; The first operating handle is located on the front side of the first receiving body away from the vehicle cab, and the first operating handle is connected to the first receiving pin through the first connecting shaft. The first positioning shaft is disposed at the end of the first receiving body, the first torsion spring is fitted onto the first positioning shaft, and one end of the first torsion spring is connected to the first receiving body, and the other end is connected to the first turntable; The first turntable is movably connected to the first positioning shaft. One end of the first reset rod is connected to the first operating handle, and the other end is connected to the first turntable. The first turntable and the first torsion spring drive the first reset rod, so that the first operating handle drives the first receiving pin to the locked position.

4. The vehicle cab lifting device according to claim 1, characterized in that, The moving end of the second boom includes a drive cylinder, a drive rod, a slide rail, a connecting rod, a second suspension chain, a second connecting plate, and a first pulley block; The fixed end of the drive cylinder is fixedly connected to the secondary support arm of the bracket, and the slide rail is disposed on the secondary support arm of the bracket relative to the drive cylinder; The drive rod is arranged along the length of the vehicle cab. One end of the drive rod is connected to the output end of the drive cylinder and slides on the slide rail. The other end of the drive rod is connected to the connecting rod. The connecting rod is arranged along the width direction of the vehicle cab, and both ends of the connecting rod are respectively connected to the second connecting plate. The first pulley block is correspondingly mounted on the second connecting plate and slides in the groove of the main support arm of the support frame, so that the moving end of the second boom slides in the groove of the main support arm of the support frame; The second connecting plate is connected to the end of the second bearing end via the second hanging chain, so as to realize the connection between the moving end of the second boom and the second bearing end.

5. The vehicle cab lifting device according to claim 1, characterized in that, The second bearing end includes a second receiving body, a second receiving arm, a second receiving pin, a second force key, and a second operating component; The second receiving body is horizontally arranged relative to the width direction of the vehicle cab, and the second receiving arm is arranged on one side of the second receiving body relative to the rear side of the vehicle cab; the second receiving arm is provided as two arms, and is distributed at intervals along the width direction of the vehicle cab. The second receiving pin is correspondingly and movably disposed at the end of the second receiving arm, and the second force key protrudes from the circumferential end face of the second receiving pin; the end of the second receiving arm is the end of the second receiving arm near the rear side of the vehicle cab. The second operating component is disposed opposite to the second receiving arm on the second receiving body. The second operating component is connected to the second receiving pin to drive the second receiving pin to rotate at a corresponding angle.

6. The vehicle cab lifting device according to claim 5, characterized in that, The second operating component includes a second operating handle, a second connecting shaft, a second reset rod, a second turntable, a second positioning shaft, and a second torsion spring; The second operating handle is located on the side of the second receiving body away from the rear of the vehicle cab, and the second operating handle is connected to the second receiving pin through the second connecting shaft; The second positioning shaft is disposed at the end of the second receiving body, the second torsion spring is fitted onto the second positioning shaft, and one end of the second torsion spring is connected to the second receiving body, and the other end is connected to the second turntable; The second turntable is movably connected to the second positioning shaft. One end of the second reset rod is connected to the second operating handle, and the other end is connected to the second turntable. The second turntable and the second torsion spring drive the second reset rod, causing the second operating handle to drive the second receiving pin to the locked position.

7. The vehicle cab lifting device according to claim 1, characterized in that, Also includes: A balancing assembly, comprising a guide groove, a third connecting plate, a guide wheel assembly, a spring balancing device, and a first connecting ring; The guide grooves are disposed opposite to each other at both ends of the support frame, and are located at the ends of the two main support arms of the support frame at each end; The guide wheel assembly is mounted on the third connecting plate and is slidably mounted in the guide groove. The guide wheel assembly drives the third connecting plate to slide in the guide groove. The spring balancing device is correspondingly connected to the third connecting plate; The first connecting rings are respectively disposed at both ends of the first bearing end and both ends of the second bearing end. Each spring balancing device corresponds to each first connecting ring, and the connecting hook of each spring balancing device is hooked to each first connecting ring.

8. The vehicle cab lifting device according to claim 1, characterized in that, Also includes: Safety component, the safety component including seat belt hook and second connecting ring; The seat belt hooks are disposed opposite to each other at both ends of the support frame, and are located at the ends of the two main support arms of the support frame at each end; The second connecting rings are respectively disposed at both ends of the first bearing end and both ends of the second bearing end, and each of the seat belt hooks corresponds to each of the second connecting rings, and each of the seat belt hooks is hooked to each of the second connecting rings.

9. The vehicle cab lifting device according to claim 1, characterized in that, Also includes: A fall arrestor is provided, which is movably mounted on the main support arm at the middle position of the support frame along the width direction of the vehicle cab, and supports the left and right side components of the vehicle cab when it moves to a designated position along the length direction of the vehicle cab.

10. The vehicle cab lifting device according to claim 9, characterized in that, The fall arrestor includes a displacement end, a connecting arm, and a support arm; The displacement end is located on the main support arm at the middle position of the support frame, and can be moved to a designated position along the length of the vehicle cab. The connecting arms are distributed along the longitudinal direction. One end of the connecting arm is connected to the displacement end so as to move synchronously with the displacement end, and the other end of the connecting arm is connected to the support arm. The support arm is arranged in a horizontal direction.

11. The vehicle cab lifting device according to claim 10, characterized in that, The displacement end includes a fourth connecting plate and a second pulley group; The second pulley group is correspondingly installed on the fourth connecting plate and slides into the groove of the main support arm of the support frame, so that the moving end of the fall arrestor slides in the groove of the main support arm of the support frame.

12. The vehicle cab lifting device according to claim 10, characterized in that, The support arm includes an adjustable screw, a bearing plate, and a buffer plate; The first end of the adjustable screw is tunably connected to the other end of the connecting arm, and the second end of the adjustable screw is connected to the bearing plate. The buffer plate is disposed on the upper surface of the bearing plate and is used to support the left and right side components of the vehicle cab.

13. The vehicle cab lifting device according to claim 12, characterized in that, The adjustable connection between the first end of the adjustable screw and the other end of the connecting arm includes at least one of the following connection methods: threaded connection, pin connection, and snap-fit ​​connection.

14. A vehicle assembly system comprising the vehicle cab lifting device as described in any one of claims 1-13.

15. A workpiece lifting device, characterized in that, include: Support frame, first boom and second boom; The fixed end of the first boom is fixedly disposed at one end of the support frame, and the first bearing end of the first boom is arranged in a horizontal direction and connected to a designated position on the front side of the workpiece. The movable end of the second boom is movably disposed at the other end of the support frame relative to the fixed end of the first boom, and can be automatically adjusted to the corresponding position of the support frame according to the length of the workpiece. The second bearing end of the second boom is arranged horizontally relative to the first bearing end and connected to a designated position at the rear end of the workpiece. The front and rear sides of the workpiece are defined by the length direction of the workpiece. The first bearing end includes a first receiving body, a first receiving arm, a first receiving pin, a first force-bearing key, and a first operating component; The first receiving body is horizontally positioned relative to the width of the vehicle cab, and the first receiving arm is positioned on one side of the first receiving body relative to the front of the vehicle cab; the first receiving arm consists of two arms, which are spaced apart along the width of the vehicle cab. The first receiving pin is correspondingly and movably disposed at the end of the first receiving arm, and the first force key protrudes from the circumferential end face of the first receiving pin; the end of the first receiving arm is the end of the first receiving arm near the front side of the vehicle cab. The first operating component is disposed on the first receiving body away from the first receiving arm. The first operating component is connected to the first receiving pin to drive the first receiving pin to rotate at a corresponding angle.

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