A subframe positioning assembly tool

Abstract

The present invention relates to a sub-frame positioning and assembly tool, which includes a fixed assembly position, a first positioning component, a movable assembly position, a second positioning component, a sliding structure and a self-locking structure, wherein each sliding cylinder can drive a corresponding sliding platform to slide and feed each crossbeam to the joint with the corresponding longitudinal beam, and the self-locking structure is used to lock the corresponding sliding platform with the workbench. Compared with the prior art, the present invention can stably load and position each crossbeam and longitudinal beam of the sub-frame, and facilitate the assembly of each crossbeam with the corresponding longitudinal beam through the sliding structure, and at the same time, the corresponding sliding platform can be locked with the workbench through the self-locking structure, so as to avoid the sliding cylinder from being affected by the tensile rebound generated by welding heat, and at the same time, effectively avoid the influence of heat concentration on the deformation of parts during the mitigation process, improve the repetitive accuracy and stability of the positioning and assembly tool, and at the same time extend the service life of the tool.

Description

Technical Field

[0001] The invention relates to the field of automobile chassis parts processing, in particular to a sub-frame positioning and assembly tool. Background Art

[0002] The subframe is the skeleton of the front and rear axles and an important component of the car chassis. Its main function is to reduce the impact of road vibration on the car body, increase the connection stiffness of the suspension system, and improve the comfort and stability of the car during driving. In addition, the subframe can also reduce the noise caused by the engine and road vibration, and improve the quietness level in the car cabin.

[0003] With the continuous development and progress of welding technology, modern welding technology has been more and more widely used in the machinery and equipment manufacturing industry. Welding fixtures can not only ensure the manufacturing accuracy of products, but also improve labor productivity and effectively reduce the labor intensity of workers. In recent years, with the improvement of the quality of the whole vehicle, the requirements for the accuracy of the subframe have become higher and higher. During the welding process, the parts will be deformed due to the concentration of heat, and a certain tension will be formed on the sliding cylinder of the fixture, which will affect the repetitive accuracy and stability of the welding fixture, and at the same time reduce the life of the positioning pins used in the sliding structure. Summary of the invention

[0004] The first technical problem to be solved by the present invention is to provide a sub-frame positioning and assembly tool with stable positioning in view of the prior art.

[0005] The second technical problem to be solved by the present invention is to provide a sub-frame positioning and assembly tool that is easy to assemble in view of the prior art.

[0006] The third technical problem to be solved by the present invention is to provide a sub-frame positioning and assembly tool that can avoid welding heat deformation in view of the prior art.

[0007] The technical solution adopted by the present invention to solve at least one of the above technical problems is: a sub-frame positioning and assembly tool, including a workbench, characterized in that:

[0008] Fixed assembly positions are respectively arranged on the left and right sides of the workbench and are used to load the left and right longitudinal beams respectively;

[0009] The first positioning components are respectively arranged on the left and right sides of the workbench and are used to position the longitudinal beams on each fixed assembly position;

[0010] The movable assembly positions are respectively arranged on the front and rear sides of the workbench and are used to load the front and rear beams respectively;

[0011] The second positioning components are respectively arranged on the front and rear sides of the workbench and are respectively used to fix the crossbeams on each movable assembly position;

[0012] Sliding structures are respectively arranged on the front and rear sides of the workbench, and each has a sliding platform and a sliding cylinder arranged on the sliding platform. Each movable assembly position is respectively arranged on a corresponding sliding platform. Each sliding cylinder can drive the corresponding sliding platform to slide and feed each crossbeam to the joint with the corresponding longitudinal beam; and

[0013] The self-locking structures are respectively arranged on the front and rear sides of the workbench and are used to lock the corresponding sliding platform with the workbench.

[0014] In order to enable the sliding structure to better drive each cross beam to slide toward the corresponding longitudinal beam, each sliding structure also includes a sliding assembly, which includes a slide rail fixed to the bottom of the above-mentioned sliding platform along the front and rear direction and a slide bar fixed to the table top of the workbench, each slide bar is embedded in the above-mentioned slide rail and can slide back and forth along the slide rail, and the inner end of the above-mentioned sliding platform is respectively fixed with a cylinder seat for installing a sliding cylinder, the cylinder seat has a bent shape and includes a horizontally arranged cross plate and a vertically arranged vertical plate, the vertical plate is located on the inner side of the corresponding cross plate, and the sliding cylinder is fixed on the cross plate, and the piston rod of the sliding cylinder can act on the vertical plate, so that each sliding cylinder can better drive the corresponding sliding platform.

[0015] In order to ensure that each beam can be firmly placed on the corresponding movable assembly position, each sliding platform extends along the left and right directions of the workbench respectively, and each movable assembly position is respectively arranged at the left and right ends of the corresponding sliding platform and corresponds to the left and right ends of the corresponding beam respectively. Each movable assembly position includes a first placement block, a first clamping block and a second clamping block fixed on the surface of the sliding platform, wherein the first placement block can be abutted against the bottom surface of the corresponding end of the corresponding beam, and the first clamping block and the second clamping block can be respectively clamped on the front and rear side surfaces of the corresponding end of the corresponding beam.

[0016] Furthermore, in order to enable each beam to be placed more stably on the corresponding movable assembly position, each sliding platform is also provided with a first positioning cylinder, and a vertically extending positioning pin is fixed on the piston rod of each first positioning cylinder, and each positioning pin can be inserted into the first positioning hole at the bottom of the corresponding beam.

[0017] In order to enable each second positioning assembly to position the corresponding crossbeam more stably, each of the second positioning assemblies includes a first clamping cylinder and a second clamping cylinder, wherein there are two first clamping cylinders and they are respectively arranged on the outside of the corresponding movable assembly position, and the piston rod of each first clamping cylinder is fixed with a first pressure head for pressing from top to bottom on the top surface of the corresponding end of the corresponding crossbeam, and the above-mentioned second clamping cylinders are also two. When each crossbeam and each longitudinal beam is loaded, each second clamping cylinder is respectively located on the inner side of each crossbeam and the longitudinal beam, and a first connecting block is respectively fixed on the piston rod of each second clamping cylinder, and a second pressure head and a third pressure head are respectively fixed on each first connecting block, wherein the second pressure head is used to press from top to bottom on the joint between each crossbeam and the corresponding longitudinal beam, and the third pressure head is used to press from top to bottom on the top surface of the corresponding crossbeam, and each third pressure head is located on the inner side of the corresponding second pressure head.

[0018] In order to ensure that each longitudinal beam can be firmly placed on the corresponding fixed assembly position, each of the fixed assembly positions includes a second placement block and a third clamping block respectively fixed on the workbench, and the second placement block can abut against the bottom surface of the middle part of the corresponding longitudinal beam, while the third clamping blocks are four and arranged in pairs on the left and right, and each third clamping block can respectively abut against the corresponding side surface of the corresponding longitudinal beam.

[0019] In order to enable each first positioning assembly to more stably position the corresponding longitudinal beam, the first positioning assembly includes a third clamping cylinder and a second positioning cylinder. A connecting frame is fixed on the piston rod of the third clamping cylinder, and a fourth pressure head is connected to the connecting frame. The fourth pressure head can be pressed from top to bottom on the top surface of the middle part of the corresponding longitudinal beam. A positioning sleeve that is vertically penetrated through the middle part of the corresponding longitudinal beam is fixed on the piston rod of the second positioning cylinder, and the second positioning cylinder is located at the bottom of the corresponding longitudinal beam.

[0020] Furthermore, through the cooperation of the third clamping cylinder and the second positioning cylinder, each longitudinal beam can be more firmly positioned at the corresponding fixed installation position, each positioning sleeve is obliquely inserted into the corresponding longitudinal beam, and the upper end of the positioning sleeve is connected to the above-mentioned connecting frame through the second connecting block.

[0021] Furthermore, each of the self-locking structures includes a self-locking cylinder and a self-locking hole, each locking cylinder is vertically inserted into the corresponding sliding platform, and a self-locking pin is fixed to the piston rod of each locking cylinder, the self-locking pin is located below the corresponding sliding platform, and the self-locking hole is provided on the table surface of the workbench and is inserted into the self-locking pin. In this way, when the self-locking pin is inserted into the corresponding self-locking hole, the sliding platform can be firmly locked on the workbench.

[0022] Compared with the prior art, the advantages of the present invention are: in the present invention, the left and right longitudinal beams are firmly positioned at the corresponding fixed assembly positions by the first positioning component, and the front and rear cross beams are firmly fixed and positioned at the corresponding movable assembly positions by the second positioning component, so that the first and second positioning components can realize the stable positioning of each longitudinal beam and each cross beam. The sliding structure can slide the corresponding cross beam to the joint with the corresponding longitudinal beam, so as to facilitate the assembly of each cross beam and the corresponding longitudinal beam. In addition, the corresponding sliding platform can be locked with the workbench by the self-locking structure, so as to avoid the sliding cylinder from being affected by the tensile rebound generated by the welding heat, and effectively avoid the deformation of the parts caused by the heat concentration during the welding process, improve the repeatability and stability of the positioning assembly tooling, and extend the service life of the tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the sub-frame positioning and assembly tooling structure in an embodiment of the present invention (in working state);

[0024] Figure 2 for Figure 1 A schematic diagram of the structure in another direction;

[0025] Figure 3 It is a structural schematic diagram of a workbench in an embodiment of the present invention;

[0026] Figure 4 It is a partial structural schematic diagram of the auxiliary frame positioning and assembly tooling in a working state according to an embodiment of the present invention;

[0027] Figure 5 It is a schematic diagram of the partial structure of the auxiliary frame positioning and assembly tooling in a non-working state according to an embodiment of the present invention;

[0028] Figure 6 It is a structural schematic diagram of the sliding structure in an embodiment of the present invention;

[0029] Figure 7 for Figure 6 A schematic diagram of the structure in another direction;

[0030] Figure 8 Schematic diagram of the structure of the auxiliary frame in the embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below with reference to the accompanying drawings.

[0032] like Figures 1 to 8As shown, a subframe positioning and assembly tool includes a workbench 1, the overall shape of the workbench 1 is a square frame, and fixed assembly positions 2 and first positioning components 3 are respectively arranged on the left and right sides thereof, wherein each fixed assembly position 2 is used to load the left and right longitudinal beams 83, 84 respectively, and each first positioning component 3 corresponds to each fixed assembly position 2 one by one and is respectively used to position the longitudinal beams on each fixed assembly position 2. At the same time, the front and rear sides of the above-mentioned workbench 1 are respectively provided with movable assembly positions 4, second positioning components 5, sliding structures 6 and self-locking structures 7, wherein each movable assembly position 4 is respectively used to load the front and rear beams 81, 82, each second positioning component 5 corresponds to each movable assembly position 4 one by one and is respectively used to position the beams on each movable assembly position 4, each sliding structure 6 has a sliding platform 61 and a sliding cylinder 62 arranged on the sliding platform 61, each movable assembly position 4 is respectively arranged on the corresponding sliding platform 61, each sliding cylinder 62 can drive the corresponding sliding platform 61 to make each beam slide and feed to the joint with the corresponding longitudinal beam, and each locking structure 7 is respectively used to lock the corresponding sliding platform 61 with the workbench 1.

[0033] Thus, in this embodiment, the left and right longitudinal beams 83, 84 are firmly positioned on the corresponding fixed assembly positions 2 by the first positioning assembly 3, and the front and rear cross beams 81, 82 are firmly fixed and positioned on the corresponding movable assembly positions 4 by the second positioning assembly 5, so that the first and second positioning assemblies 3, 5 can realize the firm positioning of each longitudinal beam and each cross beam. The sliding structure 6 can slide and feed the corresponding cross beam to the joint with the corresponding longitudinal beam, so as to facilitate the assembly of each cross beam and the corresponding longitudinal beam. In addition, the corresponding sliding platform 61 can be locked with the workbench 1 by the self-locking structure 7, so as to avoid the sliding cylinder 62 from being affected by the tensile rebound generated by the welding heat, and at the same time effectively avoid the deformation of the parts caused by the heat concentration during the welding process, improve the repeatability and stability of the positioning assembly tooling, and at the same time extend the service life of the tooling.

[0034] Furthermore, the sliding platform 61 in each sliding structure has an overall long strip shape and is arranged along the length direction of the above-mentioned workbench 1. Each sliding component 63 includes a sliding rail 631 fixed at the bottom of the above-mentioned sliding platform 61 along the front-to-back direction and a sliding bar 632 fixed to the table surface 10 of the workbench 1. Each sliding bar 632 is embedded in the above-mentioned sliding rail 631 and can slide back and forth along the sliding rail 631. In this way, by setting the sliding component 63, the sliding structure can better drive each cross beam to slide toward the corresponding longitudinal beam. In this embodiment, a notch 611 is formed in the middle of the inner side end of each sliding platform 61, and a cylinder seat 621 for installing the sliding cylinder 62 is fixed in the notch 611. In this embodiment, the cylinder seat 621 has a bent shape and includes a horizontal plate 6211 and a vertical plate 6212 arranged vertically. The vertical plate 6212 is located on the inner side of the corresponding horizontal plate 6211, and the sliding cylinder 62 is fixed on the horizontal plate 6211. The piston rod of the sliding cylinder 62 can act on the vertical plate 6212, so that each sliding cylinder 62 can better drive the corresponding sliding platform 61. In addition, square installation frames 11 are respectively arranged at the corresponding positions on the front and rear sides of the above-mentioned workbench 1, and each sliding cylinder 62 and its cylinder seat 621 are located in the corresponding installation frame 11, so that the installation of each sliding cylinder 62 is more stable, and it can play a certain limiting role on the sliding action of each sliding platform 61 to avoid excessive sliding. In addition, in this embodiment, the sliding components 63 in each sliding structure 6 are respectively two pairs, one pair of sliding components 63 is symmetrically arranged on both sides of the sliding cylinder 62, and the other pair of sliding components 63 is symmetrically arranged on the left and right ends of the sliding platform 61, so that the sliding of the sliding platform 61 can be smoother.

[0035] In this embodiment, each of the self-locking structures 7 includes a self-locking cylinder 71 and a self-locking hole 12. Each locking cylinder 71 is vertically penetrated on the corresponding sliding platform 61, and a self-locking pin 711 is fixed on the piston rod of each locking cylinder 71. The self-locking pin 711 is located below the corresponding sliding platform 61, and the self-locking hole 12 is provided on the table 10 of the workbench 1 and is inserted into the self-locking pin 711. In this way, when the self-locking pin 711 is inserted into the corresponding self-locking hole 12, the sliding platform 61 can be firmly locked on the workbench 1. Preferably, in this embodiment, two self-locking structures 7 are respectively provided on each sliding platform 61, and the two self-locking structures 7 are respectively provided on the left and right sides of the outer end of the sliding platform 61, so that the sliding platform 61 can be better self-locked through the self-locking structures 7 on both sides. In this way, when the sliding cylinder 62 drives the sliding platform 61 to make the corresponding crossbeam slide to the joint with the corresponding longitudinal beam, each locking cylinder 71 is started, and each locking pin 711 is inserted downward into the corresponding self-locking hole 12, thereby locking the sliding platform 61 on the workbench 1, which can prevent the sliding cylinder 62 from being affected by the tensile rebound generated by the welding heat, and at the same time effectively avoid the deformation of the parts caused by heat concentration during the welding process, thereby improving the repeatability and stability of the positioning and assembly tooling, and extending the service life of the tooling.

[0036] Further, each of the above-mentioned movable assembly positions 4 is respectively arranged at the left and right ends of the corresponding sliding platform 61 and corresponds to the left and right ends of the corresponding crossbeam, and each movable assembly position 4 includes a first placement block 41, a first clamping block 42 and a second clamping block 43 fixed on the table 10 of the sliding platform 61. When each crossbeam is placed on the corresponding movable assembly position 4, the first placement block 41 can abut against the bottom surface of the corresponding end of the corresponding crossbeam, and the first clamping block 42 and the second clamping block 43 can be clamped on the front and rear side surfaces of the corresponding end of the corresponding crossbeam, so that each crossbeam can be stably placed on the corresponding movable assembly position 4. Preferably, in order to make each crossbeam be placed more stably on the corresponding movable assembly position 4, each of the sliding platforms 61 is further provided with a first positioning cylinder 44, and a vertically extending positioning pin 441 is fixed on the piston rod of each first positioning cylinder 44, and each positioning pin 441 can be inserted into the first positioning hole 85 at the bottom of the corresponding crossbeam. In this embodiment, there are two first positioning cylinders 44, which are symmetrically arranged relative to the slide-in cylinder 62. There are also two first positioning holes 85 on the corresponding beams. The first positioning cylinders 44 on both sides can more stably position the corresponding beam on the corresponding movable assembly position 4. In addition, each of the fixed assembly positions 2 includes a second placement block 21 and a third clamping block 22 respectively fixed on the workbench 1. When each longitudinal beam is placed on the corresponding fixed assembly position 2, the second placement block 21 can abut against the bottom surface of the middle part of the corresponding longitudinal beam, and the third clamping block 22 is four and arranged in pairs on the left and right. Each third clamping block 22 can abut against the corresponding side surface of the corresponding longitudinal beam, so that each longitudinal beam can be stably placed on the corresponding fixed assembly position 2.

[0037] Each of the above-mentioned second positioning components 5 includes a first clamping cylinder 51 and a second clamping cylinder 52, wherein the first clamping cylinder 51 is two and is respectively arranged on the outer side of the corresponding movable assembly position 4, and the piston rod of each first clamping cylinder 51 is fixed with a first pressure head 511 for clamping from top to bottom on the top surface of the corresponding end of the corresponding cross beam, and the second clamping cylinder 52 is also two. When each cross beam and each longitudinal beam are loaded, each second clamping cylinder 52 is respectively located at each The inner side of the cross beam and the longitudinal beam, and the first connecting block 521 is fixed on the piston rod of each second clamping cylinder 52, and the second pressing head 522 and the third pressing head 523 are fixed on each first connecting block 521, wherein the second pressing head 522 is used to press from top to bottom on the joint between each cross beam and the corresponding longitudinal beam, and the third pressing head 523 is used to press from top to bottom on the top surface of the corresponding cross beam, and each third pressing head 523 is located on the inner side of the corresponding second pressing head 522. At the same time, the first positioning assembly 3 includes a third clamping cylinder 31 and a second positioning cylinder 32, a connecting frame 311 is fixed on the piston rod of the third clamping cylinder 31, a fourth pressure head 312 is connected to the connecting frame 311, and the fourth pressure head 312 can be pressed from top to bottom on the top surface of the middle part of the corresponding longitudinal beam, and a positioning sleeve 321 is fixed on the piston rod of the second positioning cylinder 32, which is penetrated up and down in the second positioning hole 86 in the middle part of the corresponding longitudinal beam, and the second positioning cylinder 32 is located at the bottom of the corresponding longitudinal beam. In this way, each longitudinal beam and cross beam can be firmly positioned at the corresponding assembly position through the first positioning assembly 3 and the second positioning assembly 5. Preferably, each positioning sleeve 321 is obliquely penetrated in the corresponding longitudinal beam, and the upper end of the positioning sleeve 321 is connected to the connecting frame 311 through the second connecting block 322, so that each longitudinal beam can be more firmly positioned at the corresponding fixed installation position through the cooperation of the third clamping cylinder 31 and the second positioning cylinder 32.

[0038] The working process of the present invention is as follows:

[0039] First, the left and right longitudinal beams 83 and 84 are placed on the corresponding fixed assembly positions 2, and the ends of each longitudinal beam are pre-positioned by each third clamping block 22, and then the middle of each longitudinal beam is positioned by the corresponding first positioning assembly 3, so that the left and right longitudinal beams 83 and 84 are firmly positioned on the corresponding fixed assembly positions 2. Then, the front and rear cross beams 81 and 82 are placed on the corresponding movable assembly positions 4, and the ends of each cross beam are pre-positioned by each first clamping block 42 and the second clamping block 43, so that the front and rear cross beams 81 and 82 can be firmly positioned on the corresponding movable assembly positions 4, and then each cross beam can be firmly loaded on the corresponding slide-in platform 61. At this time, each sliding cylinder 62 is started, and each sliding platform 61 drives the corresponding crossbeam to move toward the corresponding longitudinal beam under the drive of the corresponding sliding cylinder 62. When the corresponding crossbeam slides to the joint with the corresponding longitudinal beam, the middle part of each crossbeam and the joint between each crossbeam and the longitudinal beam are positioned through the second positioning component 5, and each locking cylinder 71 is started, and each locking pin 711 is inserted downward into the corresponding self-locking hole 12, so as to lock the sliding platform 61 on the workbench 1, so as to prevent the sliding cylinder 62 from being affected by the tensile rebound generated by the welding heat, and at the same time effectively avoid the deformation of the parts caused by the heat concentration during the welding process.

Claims

1. A sub-frame positioning and assembly tool, comprising a workbench (1), characterized in that: Fixed assembly positions (2) are respectively arranged on the left and right sides of the workbench (1) and are used to load the left and right longitudinal beams (83, 84) respectively; First positioning components (3) are respectively arranged on the left and right sides of the workbench (1) and are respectively used to position the longitudinal beams on each fixed assembly position (2); Movable assembly positions (4) are respectively arranged on the front and rear sides of the workbench (1) and are used to load the front and rear crossbeams (81, 82) respectively; Second positioning components (5) are respectively arranged on the front and rear sides of the workbench (1) and are respectively used to fix the crossbeams on each movable assembly position (4); The sliding structures (6) are respectively arranged on the front and rear sides of the workbench (1), and each sliding structure (6) has a sliding platform (61) and a sliding cylinder (62) arranged on the sliding platform (61), each movable assembly position (4) is respectively arranged on the corresponding sliding platform (61), and each sliding cylinder (62) can drive the corresponding sliding platform (61) to slide each crossbeam to the joint with the corresponding longitudinal beam; and Self-locking structures (7) are respectively arranged on the front and rear sides of the workbench (1) and are respectively used to lock the corresponding sliding platform (61) with the workbench (1); Furthermore, each of the sliding structures further comprises a sliding assembly (63), wherein the sliding assembly (63) comprises a sliding rail (631) fixed to the bottom of the sliding platform (61) along the front-rear direction and a sliding bar (632) fixed to the table surface (10) of the workbench (1), wherein each sliding bar (632) is embedded in the sliding rail (631) and can slide forward and backward along the sliding rail (631). The inner side ends of the above-mentioned sliding platform (61) are respectively fixed with cylinder seats (621) for installing the sliding cylinder (62). The cylinder seats (621) are bent in shape and include a horizontal plate (6211) and a vertical plate (6212) arranged vertically. The vertical plate (6212) is located on the inner side of the corresponding horizontal plate (6211), and the sliding cylinder (62) is fixed on the horizontal plate (6211), and the piston rod of the sliding cylinder (62) can act on the vertical plate (6212); Each of the sliding platforms (61) extends along the left and right directions of the workbench (1), and each of the movable assembly positions (4) is respectively arranged at the left and right ends of the corresponding sliding platform (61) and corresponds to the left and right ends of the corresponding crossbeam, and each of the movable assembly positions (4) comprises a first placement block (41), a first clamping block (42) and a second clamping block (43) fixed on the tabletop (10) of the sliding platform (61), wherein the first placement block (41) can abut against the bottom surface of the corresponding end of the corresponding crossbeam, and the first clamping block (42) and the second clamping block (43) can be clamped on the front and rear side surfaces of the corresponding end of the corresponding crossbeam, respectively; Each of the second positioning assemblies (5) comprises a first pressing cylinder (51) and a second pressing cylinder (52), wherein the first pressing cylinders (51) are two and are respectively arranged on the outer sides of the corresponding movable assembly positions (4), and a first pressing head (511) is fixed on the piston rod of each first pressing cylinder (51) for pressing from top to bottom on the top surface of the corresponding end of the corresponding crossbeam, There are also two of the above-mentioned second clamping cylinders (52). When each cross beam and each longitudinal beam is in the loading state, each second clamping cylinder (52) is located on the inner side of each cross beam and each longitudinal beam, and a first connecting block (521) is fixed on the piston rod of each second clamping cylinder (52), and a second pressure head (522) and a third pressure head (523) are fixed on each first connecting block (521), wherein the second pressure head (522) is used to clamp from top to bottom on the joint between each cross beam and the corresponding longitudinal beam, and the third pressure head (523) is used to clamp from top to bottom on the top surface of the corresponding cross beam, and each third pressure head (523) is located on the inner side of the corresponding second pressure head (522).

2. The subframe positioning and assembly tool as claimed in claim 1, characterized in that: Each of the sliding platforms (61) is also provided with a first positioning cylinder (44), and a vertically extending positioning pin (441) is fixed on the piston rod of each of the first positioning cylinders (44), and each positioning pin (441) can be inserted into a first positioning hole (85) at the bottom of the corresponding crossbeam.

3. The subframe positioning and assembly tool as claimed in claim 1, characterized in that: Each of the fixed assembly positions (2) comprises a second placement block (21) and a third clamping block (22) respectively fixed on the workbench (1), and the second placement block (21) can abut against the bottom surface of the middle part of the corresponding longitudinal beam, and the third clamping blocks (22) are four and arranged in pairs on the left and right, and each third clamping block (22) can abut against the corresponding side surface of the corresponding longitudinal beam.

4. The subframe positioning and assembly tool as claimed in claim 1, characterized in that: The first positioning assembly (3) comprises a third clamping cylinder (31) and a second positioning cylinder (32); a connecting frame (311) is fixed to the piston rod of the third clamping cylinder (31); a fourth pressure head (312) is connected to the connecting frame (311); the fourth pressure head (312) can be pressed from top to bottom on the top surface of the middle part of the corresponding longitudinal beam; a positioning sleeve (321) is fixed to the piston rod of the second positioning cylinder (32) and is passed through the middle part of the corresponding longitudinal beam; and the second positioning cylinder (32) is located at the bottom of the corresponding longitudinal beam.

5. The subframe positioning and assembly tool as claimed in claim 4, characterized in that: Each positioning sleeve (321) is obliquely inserted into the corresponding longitudinal beam, and the upper end of the positioning sleeve (321) is connected to the connecting frame (311) via a second connecting block (322).

6. The subframe positioning and assembly tool according to any one of claims 1 to 5, characterized in that: Each of the self-locking structures (7) comprises a self-locking cylinder (71) and a self-locking hole (12), each locking cylinder (71) is vertically penetrated on the corresponding sliding platform (61), and a self-locking pin (711) is fixed on the piston rod of each locking cylinder (71), and the self-locking pin (711) is located below the corresponding sliding platform (61), and the self-locking hole (12) is opened on the table surface (10) of the workbench (1) and is for the self-locking pin (711) to be inserted.

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