Combined positioning clamp for rear axle structure of tricycle

Abstract

The utility model discloses a combined positioning clamp for a rear axle structure of a tricycle. The combined positioning clamp comprises a platform, a first positioning assembly and a clamping assembly, wherein the first positioning assembly is used for positioning two shaft sleeves, and the clamping assembly can clamp the end of each shaft sleeve so as to keep the shaft sleeves fixed to the platform. And the second positioning assembly can keep the main body supporting pipe combined frame and the two shaft sleeves in a fixed posture. And the third positioning assembly can keep the branch pipe combination frame and the two shaft sleeves in a fixed posture. And the fourth positioning assembly can keep the lower supporting pipe combination frame and the two shaft sleeves in a fixed posture. When the third positioning assembly and the clamping assembly are in the opening state, the combined rear axle structure can be taken out of the combined positioning clamp, and when the third positioning assembly and the clamping assembly are in the locking state, the combined rear axle structure is fixed to the combined positioning clamp. The combined positioning clamp replaces a traditional manual combined positioning mode, and the positioning problem caused by the complex structure of the rear axle and the level difference of operators is effectively avoided.

Description

Technical Field

[0001] The embodiments of this utility model relate to the field of combined positioning technology for the rear axle structure of a tricycle, and more specifically, this utility model relates to a combined positioning fixture for the rear axle structure of a tricycle. Background Technology

[0002] As a core load-bearing component of a three-wheeled vehicle, the rationality of its structural design directly affects the stability and durability of the entire vehicle. A typical rear axle structure is welded together from several key components, mainly including two axle sleeves, which serve as the main parts connecting the rear axle to the wheels; a main support tube assembly frame welded to the axle sleeves, providing the main longitudinal support force for the rear axle; and a branch tube assembly frame and a lower support tube assembly frame, which further enhance the lateral stability and torsional resistance of the rear axle. These components are formed into a whole through welding, jointly bearing various loads during vehicle operation.

[0003] However, before welding work can be carried out on the existing rear axle structure of tricycles, its assembly and positioning are usually done manually. Given the complexity of the rear axle structure itself and the varying skill levels of operators, manual assembly and positioning can easily lead to misalignment between the two axle sleeves. Simultaneously, the placement of the main support tube assembly frame, branch tube assembly frame, and lower support tube assembly frame may also shift. These problems make it difficult to smoothly assemble the rear axle structure with the other components of the tricycle after welding. Utility Model Content

[0004] To address one or more of the technical problems mentioned above, this utility model provides a combined positioning fixture for the rear axle structure of a tricycle, which replaces the traditional manual assembly positioning method and effectively avoids positioning problems caused by the complexity of the rear axle structure and the differences in the skill level of the operators.

[0005] This utility model embodiment provides a combined positioning fixture for a rear axle structure of a tricycle. The rear axle structure includes two axle sleeves, a main support tube assembly welded to the two axle sleeves, a lower support tube assembly welded to the two axle sleeves, and a branch tube assembly welded between the main support tube assembly and the lower support tube assembly. The combined positioning fixture comprises:

[0006] platform;

[0007] A first positioning component is disposed on the platform and used to position the two bushings;

[0008] A clamping assembly, disposed on the platform, is capable of clamping the end of each of the bushings to keep the bushings fixed to the platform;

[0009] The second positioning component is located on the platform and can keep the main support tube assembly and the two bushings in a fixed posture.

[0010] A third positioning component, which is mounted on the platform and capable of maintaining the branch pipe assembly and the two bushings in a fixed position; and

[0011] The fourth positioning component is located on the platform and is able to keep the lower support tube assembly and the two bushings in a fixed position.

[0012] The third positioning component and the clamping component have an open state and a locked state. When the third positioning component and the clamping component are in the open state, the combined rear axle structure can be removed from the combined positioning fixture. When the third positioning component and the clamping component are in the locked state, the combined rear axle structure is fixed on the combined positioning fixture.

[0013] Furthermore, the first positioning component includes a plurality of first positioning blocks disposed on the platform and arranged along the axial direction of the bushing, each of the first positioning blocks having a first receiving groove that fits against the wall of the bushing.

[0014] Furthermore, the combined positioning fixture also includes a rotation limiting component disposed on the platform, the rotation limiting component comprising:

[0015] A transfer-limiting block, which is located on the platform; and

[0016] A rotation limiting post, which can pass sequentially through the connecting hole of one of the bushings, the rotation limiting block and the connecting hole of the other bushing, to restrict the two bushings from rotating about their own axial direction.

[0017] Furthermore, the clamping assembly includes:

[0018] Abutment block, disposed on the platform, having two abutment steps corresponding to the closest ends of the two bushings, wherein a portion of the abutment step abuts against the wall of the corresponding bushing, and the other portion of the abutment step extends into the corresponding bushing; and

[0019] Two cylinders are mounted on the platform and are positioned at the ends of the two bushings that are furthest apart.

[0020] The two cylinders are respectively able to abut against the farthest ends of the two bushings and push the closest ends of the two bushings against the two abutting steps of the abutting block.

[0021] Furthermore, the second positioning component includes:

[0022] A support frame, which is mounted on the platform; and

[0023] A support bracket is located on top of the support frame and has multiple second receiving grooves arranged in a longitudinal and transverse manner that can fit against the outer wall of the main support tube assembly frame.

[0024] Furthermore, the fourth positioning component includes:

[0025] The second positioning block is located on the platform and has a third receiving groove that fits against the outer wall of the lower support tube assembly frame.

[0026] Multiple support rods are mounted on the platform; and

[0027] A support block, which is fitted onto the support rod;

[0028] One part of the lower support tube assembly is placed in the third receiving groove, and the supporting surface of the supporting block can support the other part of the lower support tube assembly.

[0029] Furthermore, the fourth positioning component also includes an adjusting plate for connecting the support rod and a fastening bolt. The adjusting plate has a first oblong hole along its length direction, and the platform has a second oblong hole along its width direction. The fastening bolt can be sequentially inserted into the first oblong hole and the second oblong hole.

[0030] Furthermore, the third positioning component includes:

[0031] A fixing plate is provided on the second positioning block;

[0032] A switch is disposed on the surface of the fixed plate;

[0033] The third positioning block has a fourth receiving groove that can fit against the outer wall of the branch pipe assembly frame; and

[0034] A connecting block, one end of which is connected to the switch, and the other end of which is connected to the third positioning block;

[0035] When the switch is turned on, the connecting block can move the third positioning block away from the branch pipe assembly frame to release the restriction on the branch pipe assembly frame. When the switch is turned off, the connecting block can move the third positioning block closer to and against the outer wall of the branch pipe assembly frame to restrict the movement of the branch pipe assembly frame.

[0036] Furthermore, the third positioning component also includes a guide plate disposed on the surface of the fixed plate, the guide plate having a guide groove, and the connecting block passing through the guide groove and connecting to the third positioning block.

[0037] Furthermore, the switch includes:

[0038] A base is disposed on the surface of the fixing plate;

[0039] A joystick, which is hinged to the base; and

[0040] A connecting plate, one end of which is hinged to the connecting block, and the other end of which is hinged to the rocker arm;

[0041] Rotating the rocker arm can move the third positioning block away from or towards the branch pipe assembly frame.

[0042] This embodiment provides a combined positioning fixture for the rear axle structure of a tricycle. It is equipped with a first positioning component, a clamping component, a second positioning component, a third positioning component, and a fourth positioning component. These components work together to achieve precise positioning and stable clamping of the two axle sleeves, the main support tube assembly frame, the branch tube assembly frame, and the lower support tube assembly frame. This replaces the traditional manual assembly and positioning method, effectively avoiding positioning problems caused by the complexity of the rear axle structure and differences in operator skill. Specifically, this solution ensures that the two axle sleeves in the rear axle structure always maintain precise coaxiality, greatly improving the installation accuracy of the axle sleeves. Simultaneously, the placement positions of the main support tube assembly frame, the branch tube assembly frame, and the lower support tube assembly frame can be precisely controlled, eliminating positional deviations. This significantly improves the quality of the assembled rear axle structure, greatly enhances its compatibility with other tricycle structures, effectively reduces assembly difficulty, improves assembly efficiency, and provides strong support for the overall production quality and efficiency of the tricycle. It is worth mentioning that the third positioning component and the clamping component have both open and locked states. After the assembly and positioning operation is completed, switching the third positioning component and clamping component to the open state allows for easy removal of the assembled rear axle structure from the assembly and positioning fixture, greatly improving production efficiency. During assembly, the third positioning component and clamping component remain locked, firmly securing the rear axle structure to the assembly and positioning fixture. This effectively prevents welding defects caused by component displacement during subsequent welding, providing a solid guarantee for welding quality. Attached Figure Description

[0043] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0044] Figure 1 A schematic diagram of the structure of the rear axle of the tricycle involved in an embodiment of this utility model is shown;

[0045] Figure 2 This invention provides a schematic diagram of a combined positioning fixture for a tricycle rear axle structure and a tricycle rear axle structure according to an embodiment of the present invention.

[0046] Figure 3 This diagram illustrates a combined positioning fixture for a tricycle rear axle structure provided by an embodiment of the present invention.

[0047] Figure 4 This diagram illustrates the structure of the platform, the first positioning component, and the clamping component provided in an embodiment of the present invention.

[0048] Figure 5 This diagram illustrates the structure of the platform, the second positioning component, and the rotation limiting component provided in this embodiment of the present invention.

[0049] Figure 6 The platform, third positioning component, and fourth positioning component provided in the embodiments of this utility model are shown.

[0050] In the picture:

[0051] 1. Platform; 11. Second oblong hole;

[0052] 2. First positioning component; 21. First positioning block; 211. First receiving slot;

[0053] 3. Clamping assembly; 31. Abutting block; 311. Abutting step; 32. Cylinder;

[0054] 4. Second positioning component; 41. Support frame; 42. Support bracket; 421. Second receiving groove;

[0055] 5. Third positioning component; 51. Fixing plate; 52. Switch; 521. Base; 522. Rocker arm; 523. Connecting plate; 53. Third positioning block; 531. Fourth receiving slot; 54. Connecting block; 55. Guide plate;

[0056] 6. Fourth positioning component; 61. Second positioning block; 611. Third receiving groove; 62. Support rod; 63. Support block; 64. Adjusting plate; 641. First oblong hole;

[0057] 7. Restricted rotation component; 71. Restricted rotation block; 72. Restricted rotation column;

[0058] 100, bushing; 101, connecting hole; 200, main support tube assembly frame; 300, lower support tube assembly frame; 400, branch tube assembly frame. Detailed Implementation

[0059] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0060] Figure 1 A structural schematic diagram of the rear axle structure of the three-wheeled vehicle involved in this embodiment is shown. Figure 1 As shown, the rear axle structure of the tricycle mainly includes two axle sleeves 100, a main support tube assembly frame 200 welded to the two axle sleeves 100, a lower support tube assembly frame 300 welded to the two axle sleeves 100, and a branch tube assembly frame 400 welded between the main support tube assembly frame 200 and the lower support tube assembly frame 300.

[0061] Figure 2 This embodiment shows a structural schematic diagram of a combined positioning fixture for a tricycle rear axle structure. Figure 3 This embodiment illustrates a combined positioning fixture for a tricycle rear axle structure and a schematic diagram of the tricycle rear axle structure. Figure 2 and Figure 3 and combined Figure 1As shown, this embodiment provides a combined positioning fixture for a tricycle rear axle structure, comprising a platform 1, a first positioning component 2, a clamping component 3, a second positioning component 4, a third positioning component 5, and a fourth positioning component 6. The first positioning component 2 is mounted on the platform 1 and is used to position the two bushing tubes 100. The clamping component 3 is mounted on the platform 1 and can clamp the end of each bushing tube 100 to keep the bushing tube 100 fixed on the platform 1. The second positioning component 4 is mounted on the platform 1 and can keep the main support tube assembly 200 and the two bushing tubes 100 in a fixed posture. The third positioning component 5 is mounted on the platform 1 and can keep the branch tube assembly 400 and the two bushing tubes 100 in a fixed posture. The fourth positioning component 6 is mounted on the platform 1 and can keep the lower support tube assembly 300 and the two bushing tubes 100 in a fixed posture. The third positioning component 5 and the clamping component 3 have an open state and a locked state. When the third positioning component 5 and the clamping component 3 are in the open state, the combined rear axle structure can be removed from the combined positioning fixture. When the third positioning component 5 and the clamping component 3 are in the locked state, the combined rear axle structure is fixed on the combined positioning fixture.

[0062] This embodiment provides a combined positioning fixture for the rear axle structure of a tricycle. It is equipped with a first positioning component 2, a clamping component 3, a second positioning component 4, a third positioning component 5, and a fourth positioning component 6. These components work together to achieve precise positioning and stable clamping of the two axle sleeves 100, the main support tube assembly frame 200, the branch tube assembly frame 400, and the lower support tube assembly frame 300. This replaces the traditional manual assembly positioning method, effectively avoiding positioning problems caused by the complexity of the rear axle structure and differences in operator skill. Specifically, this solution ensures that the two axle sleeves 100 in the rear axle structure always maintain precise coaxiality, greatly improving the installation accuracy of the axle sleeves 100. Simultaneously, the placement positions of the main support tube assembly frame 200, the branch tube assembly frame 400, and the lower support tube assembly frame 300 can also be precisely controlled, eliminating positional deviations. This significantly improves the quality of the assembled rear axle structure and greatly enhances its compatibility with other tricycle components, effectively reducing assembly difficulty and increasing efficiency, thus providing a strong guarantee for the overall production quality and efficiency of the tricycle. It is worth mentioning that the third positioning component 5 and the clamping component 3 have both open and locked states. After the assembly positioning operation is completed, switching the third positioning component 5 and the clamping component 3 to the open state allows for easy removal of the assembled rear axle structure from the assembly positioning fixture, greatly improving production efficiency. During the assembly process, the third positioning component 5 and the clamping component 3 are in the locked state, firmly fixing the rear axle structure to the assembly positioning fixture, effectively avoiding welding defects caused by component displacement during subsequent welding, and providing a solid guarantee for welding quality.

[0063] Figure 4 A schematic diagram of the platform 1, the first positioning component 2, and the clamping component 3 provided in this embodiment is shown. Figure 4 and combined Figures 1-3 As shown, the first positioning component 2 includes a plurality of first positioning blocks 21 disposed on the platform 1 and arranged along the axial direction of the bushing 100. Each first positioning block 21 has a first receiving groove 211 that fits against the wall of the bushing 100. The bushing 100 is positioned by using the first receiving groove 211, which can not only achieve the positioning of the bushing 100, but also prevent the first positioning component 2 from obstructing the entry and exit of the bushing 100, making it easier to install and disassemble.

[0064] Furthermore, the clamping assembly 3 includes an abutment block 31 and two cylinders 32. The abutment block 31 is disposed on the platform 1 and has two abutment steps 311 corresponding to the closest ends of the two bushings 100. A portion of the abutment step 311 can abut against the wall of its corresponding bushing 100, and another portion of the abutment step 311 can extend into its corresponding bushing 100. The two cylinders 32 are disposed on the platform 1 and corresponding to the farthest ends of the two bushings 100. The two cylinders 32 can abut against the farthest ends of the two bushings 100 respectively and push the closest ends of the two bushings 100 against the two abutment steps 311 of the abutment block 31. The cylinder 32 pushes the bushing 100 to move, so as to clamp the bushing 100 placed on multiple first positioning blocks 21, thereby limiting the bushing 100 in the axial direction, and using the first positioning blocks 21 to position the bushing 100, thereby achieving multi-directional limiting of the bushing 100.

[0065] Figure 5 A schematic diagram of the structure of the platform 1, the second positioning component 4, and the rotation limiting component 7 provided in this embodiment is shown. Figure 5 and combined Figures 1-4 As shown, the combined positioning fixture also includes a rotation limiting component 7 disposed on the platform 1. The rotation limiting component 7 includes a rotation limiting block 71 and a rotation limiting post 72. The rotation limiting block 71 is disposed on the platform 1. The rotation limiting post 72 can sequentially pass through the connecting hole 101 of one of the bushings 100, the rotation limiting block 71, and the connecting hole 101 of the other bushing 100, to limit the rotation of the two bushings 100 around their own axial direction. After the two bushings 100 are placed in the first receiving groove 211 of the plurality of first positioning blocks 21, the rotation limiting post 72 is sequentially inserted into the connecting hole 101 of one of the bushings 100, the rotation limiting block 71, and the connecting hole 101 of the other bushing 100, thereby using the rotation limiting post 72 to limit the relative rotation of the two bushings 100, so as to ensure that the connecting holes 101 of the two bushings 100 can maintain an aligned posture after assembly.

[0066] Furthermore, the second positioning component 4 includes a support frame 41 and a support bracket 42. The support frame 41 is mounted on the platform 1. The support bracket 42 is located on top of the support frame 41 and has multiple longitudinally and transversely arranged second receiving grooves 421 that can fit against the outer wall of the main support pipe assembly frame 200. Since the main support pipe assembly frame 200 is an integral structure, the longitudinal and transverse arrangement can limit the displacement of the support pipe assembly frame in all directions on the horizontal plane, thereby playing an effective positioning role and ensuring that the main support pipe assembly frame 200 will not shift after being placed on the support bracket 42, thus ensuring the assembly accuracy of the main support pipe assembly frame 200 and the two bushings 100. In addition, the second receiving grooves 421 can also prevent the second positioning component 4 from obstructing the entry and exit of the main support pipe assembly frame 200, making installation and disassembly easier.

[0067] Figure 6 The platform 1, the third positioning component 5, and the fourth positioning component 6 provided in this embodiment are shown. Figure 6 and combined Figures 1-5 As shown, the fourth positioning component 6 includes a second positioning block 61, multiple support rods 62, and a support block 63. The second positioning block 61 is mounted on the platform 1 and has a third receiving groove 611 that fits against the outer wall of the lower support tube assembly 300. Multiple support rods 62 are mounted on the platform 1. The support block 63 is fitted onto the support rods 62. A portion of the lower support tube assembly 300 is placed in the third receiving groove 611, and the supporting surface of the support block 63 can support another portion of the lower support tube assembly 300. The third receiving groove 611 and the support block 63 enable effective positioning of the lower support tube assembly 300 to ensure the assembly accuracy of the lower support tube assembly 300 with the two bushings 100. Furthermore, they prevent the fourth positioning component 6 from obstructing the entry and exit of the lower support tube assembly 300, making installation and disassembly easier. Since the lower support pipe assembly frame 300 is relatively long, the support block 63 is used to support the lower support pipe assembly frame 300. This ensures effective positioning of the lower support pipe assembly frame 300 while reducing the slotting area of ​​the third receiving groove 611, thereby reducing manufacturing costs.

[0068] Furthermore, the fourth positioning component 6 also includes an adjusting plate 64 for connecting the support rod 62 and fastening bolts. The adjusting plate 64 has a first oblong hole 641 along its length direction, and the platform 1 has a second oblong hole 11 along its width direction. The fastening bolts can be sequentially inserted into the first oblong hole 641 and the second oblong hole 11. By setting the first oblong hole 641 and the second oblong hole 11, the position of the support rod 62 on the horizontal plane can be adjusted so that the wall of the support rod 62 can abut against part of the tube wall of the lower support tube assembly 300, thereby providing a certain limiting effect on the lower support tube assembly 300.

[0069] Furthermore, the third positioning component 5 includes a fixing plate 51, a switch 52, a third positioning block 53, and a connecting block 54. The fixing plate 51 is disposed on the second positioning block 61. The switch 52 is disposed on the surface of the fixing plate 51. The third positioning block 53 is provided with a fourth receiving groove 531 that can fit against the outer wall of the branch pipe assembly frame 400. One end of the connecting block 54 is connected to the switch 52, and the other end is connected to the third positioning block 53. When the switch 52 is open, the connecting block 54 can drive the third positioning block 53 away from the branch pipe assembly frame 400 to release the restriction on the branch pipe assembly frame 400, and the cylinder 32 of the clamping component 3 drives the abutment block 31 away from the end furthest from the two bushings 100 to contact the restriction on the two bushings 100. When the switch 52 is closed, the connecting block 54 can drive the third positioning block 53 to approach and abut against the outer wall of the branch pipe assembly frame 400 to restrict the movement of the branch pipe assembly frame 400. After assembling the two bushings 100, the main support tube assembly 200, and the branch tube assembly 400, the operating switch 52 is turned on to align the branch tube assembly 400 between the main support tube assembly 200 and the lower support tube assembly 300. The operating switch 52 is then turned off, causing the connecting block 54 to move closer to the branch tube assembly 400 and the third positioning block 53 to approach and abut against the branch tube assembly 400. This allows the fourth receiving groove 531 to position the branch tube assembly 400, preventing it from shifting during assembly and improving the assembly accuracy between the branch tube assembly 400, the main support tube assembly 200, and the lower support tube assembly 300. After assembly, the switch 52 and cylinder 32 are turned on again to allow the rear axle structure to be completely removed. This effectively positions the rear axle structure and facilitates its removal.

[0070] Furthermore, the third positioning component 5 also includes a guide plate 55 disposed on the surface of the fixed plate 51. The guide plate 55 is provided with a guide groove. The connecting block 54 passes through the guide groove and is connected to the third positioning block 53. By setting the guide plate 55, the third positioning block 53 is ensured to move in a fixed direction, reducing the possibility of the third positioning block 53 shifting during the operation of the switch 52.

[0071] Furthermore, the switch 52 includes a base 521, a rocker arm 522, and a connecting plate 523. The base 521 is mounted on the surface of the fixed plate 51. The rocker arm 522 is hinged to the base 521. One end of the connecting plate 523 is hinged to the connecting block 54, and the other end is hinged to the rocker arm 522. Rotating the rocker arm 522 can move the third positioning block 53 away from or towards the branch pipe assembly frame 400. This allows the switch to be opened so that when open, the connecting block 54 can move the third positioning block 53 away from the branch pipe assembly frame 400 to release the restriction on the branch pipe assembly frame 400. When closed, the connecting block 54 can move the third positioning block 53 towards and against the outer wall of the branch pipe assembly frame 400 to restrict the movement of the branch pipe assembly frame 400.

[0072] In the foregoing description of this application, unless otherwise expressly specified and limited, the terms "fixed," "installed," "connected," or "linked" should be interpreted broadly. For example, the term "linked" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can refer to the internal communication of two components or the interaction between two components. Therefore, unless otherwise expressly limited in this application, those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0073] Based on the above description of this application, those skilled in the art will also understand that the following terms used, such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "center," "longitudinal," "transverse," "clockwise," or "counterclockwise," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this application. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as a limitation on the present invention.

[0074] Furthermore, the terms "first" or "second," etc., used in this application to refer to numbers or ordinal numbers are for descriptive purposes only and should not be construed as explicitly or implicitly indicating relative importance or specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0075] While various embodiments of the present invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of the present invention. It should be understood that various alternatives to the embodiments of the present invention described herein may be employed in the practice of the present invention. The appended claims are intended to define the scope of protection of the present invention and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A combination fixture for positioning a trike rear axle structure, said rear axle structure comprising two axle sleeve tubes, a main support tube assembly welded to both of said axle sleeve tubes, a lower support tube assembly welded to both of said axle sleeve tubes, and a support tube assembly welded between said main support tube assembly and said lower support tube assembly, characterized by, The combined positioning fixture includes: platform; A first positioning component is disposed on the platform and used to position the two bushings; A clamping assembly, disposed on the platform, is capable of clamping the end of each of the bushings to keep the bushings fixed to the platform; The second positioning component is located on the platform and can keep the main support tube assembly and the two bushings in a fixed posture. A third positioning component, which is mounted on the platform and capable of maintaining the branch pipe assembly and the two bushings in a fixed position; and The fourth positioning component is located on the platform and is able to keep the lower support tube assembly and the two bushings in a fixed position. The third positioning component and the clamping component have an open state and a locked state. When the third positioning component and the clamping component are in the open state, the combined rear axle structure can be removed from the combined positioning fixture. When the third positioning component and the clamping component are in the locked state, the combined rear axle structure is fixed on the combined positioning fixture.

2. The combination positioning fixture of claim 1, wherein, The first positioning component includes a plurality of first positioning blocks disposed on the platform and arranged along the axial direction of the bushing tube, each of the first positioning blocks having a first receiving groove that fits against the tube wall of the bushing tube.

3. The combination fixture of claim 2 wherein, The combined positioning fixture further includes a rotation limiting component disposed on the platform, the rotation limiting component comprising: A transfer-limiting block, which is located on the platform; and A rotation limiting post, which can pass sequentially through the connecting hole of one of the bushings, the rotation limiting block and the connecting hole of the other bushing, to restrict the two bushings from rotating about their own axial direction.

4. The combination fixture of claim 2 wherein, The clamping assembly includes: Abutment block, disposed on the platform, having two abutment steps corresponding to the closest ends of the two bushings, wherein a portion of the abutment step abuts against the wall of the corresponding bushing, and the other portion of the abutment step extends into the corresponding bushing; and Two cylinders are mounted on the platform and are positioned at the ends of the two bushings that are furthest apart. The two cylinders are respectively able to abut against the farthest ends of the two bushings and push the closest ends of the two bushings against the two abutting steps of the abutting block.

5. The combination positioning fixture of claim 1, wherein, The second positioning component includes: A support frame, which is mounted on the platform; and A support bracket is located on top of the support frame and has multiple second receiving grooves arranged in a longitudinal and transverse manner that can fit against the outer wall of the main support tube assembly frame.

6. The combination positioning fixture of claim 1, wherein, The fourth positioning component includes: The second positioning block is located on the platform and has a third receiving groove that fits against the outer wall of the lower support tube assembly frame. Multiple support rods are mounted on the platform; and A support block, which is fitted onto the support rod; One part of the lower support tube assembly is placed in the third receiving groove, and the supporting surface of the supporting block can support the other part of the lower support tube assembly.

7. The combination fixture of claim 6 wherein, The fourth positioning component also includes an adjusting plate for connecting the support rod and a fastening bolt. The adjusting plate has a first waist-shaped hole along its length direction, and the platform has a second waist-shaped hole along its width direction. The fastening bolt can be sequentially inserted into the first waist-shaped hole and the second waist-shaped hole.

8. The combination fixture of claim 6 wherein, The third positioning component includes: A fixing plate is provided on the second positioning block; A switch is disposed on the surface of the fixed plate; The third positioning block has a fourth receiving groove that can fit against the outer wall of the branch pipe assembly frame; and A connecting block, one end of which is connected to the switch, and the other end of which is connected to the third positioning block; When the switch is turned on, the connecting block can move the third positioning block away from the branch pipe assembly frame to release the restriction on the branch pipe assembly frame. When the switch is turned off, the connecting block can move the third positioning block closer to and against the outer wall of the branch pipe assembly frame to restrict the movement of the branch pipe assembly frame.

9. The combination positioning fixture of claim 8, wherein, The third positioning component also includes a guide plate disposed on the surface of the fixed plate, the guide plate having a guide groove, and the connecting block passing through the guide groove and connecting to the third positioning block.

10. The combination positioning fixture of claim 8, wherein, The switch includes: A base is disposed on the surface of the fixing plate; A joystick, which is hinged to the base; and A connecting plate, one end of which is hinged to the connecting block, and the other end of which is hinged to the rocker arm; Rotating the rocker arm can move the third positioning block away from or towards the branch pipe assembly frame.

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