Positioning device for welding automobile rear axle

Abstract

The application provides a positioning device for automobile rear axle welding, and relates to the technical field of rear axle welding.The positioning device comprises a base, sleeve fixing mechanisms symmetrically arranged on the left and right sides of the base, a base seat arranged at the center of the base, a bridge package lifting motor arranged at the bottom of the base seat, a lifting shaft arranged at the output end of the bridge package lifting motor, a mounting seat arranged at the upper end of the lifting shaft, a bridge package positioning disc arranged on the mounting seat, and the bridge package positioning disc is detachably connected with the mounting seat.In the application, the sleeve fixing mechanisms arranged on the left and right sides can fix the left half axle sleeve and the right half axle sleeve respectively, then the bridge package is installed on the bridge package positioning disc, welding guns are arranged at the connecting positions of the bridge package and the left half axle sleeve and the right half axle sleeve respectively, and the bridge package can be synchronously welded on both sides through the welding guns.Through the positioning device, the three components of the automobile three-section rear axle can be simultaneously positioned and welded, so that the welding efficiency is improved, the research and development and manufacturing cost of the production equipment are reduced, and the investment in the production line is reduced.

Description

Technical Field

[0001] This invention relates to the field of rear axle welding technology, and in particular to a positioning device for welding automotive rear axles. Background Technology

[0002] The rear axle refers to the rear drive shaft component that transmits power to a vehicle. In the production of the rear axle, the welding of the axle housing and the axle sleeves is crucial, involving the rotary welding of a three-section automotive rear axle. A three-section automotive rear axle includes the axle housing and the left and right axle sleeves located on either side of the housing. The three-section rear axle is an important component of the vehicle's running gear, and its quality directly affects vehicle performance and driving safety. With continuous advancements in automotive manufacturing technology, the production of three-section automotive rear axles needs to continuously improve production efficiency while ensuring quality.

[0003] The invention disclosed in authorization announcement number "CN108994510B" is a welding fixture for a rear axle of an automobile. It includes a support base, a movable rod positioned on one side of the top of the support base, a first guide rail positioned in the middle of the top of the support base, a support column positioned in the middle of the top of the first guide rail, a bracket positioned on the top of the support column, and the outer surface of the first guide rail slidably connected to a movable plate. A clamping mechanism is positioned on the top of the movable plate, comprising two jig frames, two first clamps, and two second clamps. Two jig frames are movably mounted on the top of the movable plate. This invention allows the movable plate to move via the movable rod, facilitating the assembly of two components to be welded. The first and second telescopic cylinders can respectively clamp the second and first components, resulting in high clamping efficiency and structural stability. Clamping the two components of the automobile rear axle not only saves manpower but also improves the welding efficiency of the workers.

[0004] However, since the three-section rear axle has three components—the axle housing, the left half-axle sleeve, and the right half-axle sleeve—the aforementioned rear axle welding fixture can only weld two components at the same time. Therefore, the circumferential welding of the three-section rear axle needs to be carried out in two steps, resulting in low welding efficiency. Summary of the Invention

[0005] This invention provides a positioning device for welding automotive rear axles, which solves the technical problem that current rear axle welding fixtures can only install two components at the same time, resulting in low welding efficiency.

[0006] To solve the above-mentioned technical problems, the present invention discloses a positioning device for welding the rear axle of an automobile, comprising: a base, sleeve fixing mechanisms symmetrically arranged on the left and right sides of the base, a base seat arranged at the center of the base, an axle bearing lifting motor arranged at the bottom of the base, a lifting shaft arranged at the output end of the axle bearing lifting motor, a mounting seat arranged at the upper end of the lifting shaft, an axle bearing positioning plate arranged on the mounting seat, and the axle bearing positioning plate being detachably connected to the mounting seat.

[0007] Preferably, a bridge package positioning and lifting assembly is provided between the mounting base and the base. The bridge package positioning and lifting assembly includes several bridge package lifting spacers, which are arranged in a circular array about the center of the lifting shaft. The bridge package lifting spacers are set on the base, and the lower end of the bridge package lifting spacer extends to the bottom of the base. A guide post is slidably arranged inside the bridge package lifting spacer, and the upper end of the guide post is connected to the lower surface of the mounting base.

[0008] Preferably, the sleeve fixing mechanism includes a propulsion cylinder, a propulsion shaft is provided at one end of the propulsion cylinder near the axle package positioning plate, a power box is provided at the end of the propulsion shaft near the axle package positioning plate, a rotary motor is provided in the power box, a rotary shaft is provided at the output end of the rotary motor, a rotary box is provided at the end of the rotary shaft near the axle package positioning plate, clamping cylinders are symmetrically arranged on the front and rear sides of the rotary box, and clamping heads are provided at the output ends of the clamping cylinders, with the clamping heads located on the side of the rotary box near the axle package positioning plate.

[0009] Preferably, a tensioning cylinder is installed inside the rotating box, a tensioning shaft is installed at the end of the tensioning cylinder near the bridge positioning plate, and a flange expansion sleeve is installed at the end of the tensioning shaft near the bridge positioning plate. The flange expansion sleeve is located between the clamping head and the rotating box.

[0010] Preferably, a fixed oil ring is provided between the rotary box and the power box, and the fixed oil ring is connected to the oil circuits of the propulsion cylinder, the clamping cylinder and the tensioning cylinder respectively.

[0011] Preferably, two linear guide rails are arranged on the base along the length of the base. The two linear guide rails are symmetrically arranged on the front and rear sides of the power box. A slide table is slidably arranged between the two linear guide rails. The upper surface of the slide table is connected to the bottom wall of the power box. An adjustment connecting sleeve is arranged on the upper surface of the slide table. An adjustment connecting shaft is slidably arranged inside the adjustment connecting sleeve. The end of the adjustment connecting shaft near the base is connected to the sleeve support block through an adjustment connecting plate. A V-shaped opening is provided at the upper end of the sleeve support block.

[0012] Preferably, a fixed vertical plate is provided behind the base, and a first rack is slidably provided on the side of the fixed vertical plate near the mounting base. A fixed horizontal plate is provided at the upper end of the first rack, and the fixed horizontal plate extends to the top of the bridge axle positioning plate at the end near the mounting base. Telescopic shafts are provided on the lower surfaces of the left and right ends of the fixed horizontal plate, and two telescopic shafts are symmetrically provided on the left and right sides of the bridge axle positioning plate. A pressure plate is provided at the lower end of the telescopic shaft. The pressure plate is semi-circular, and a pressure strip is provided on the lower surface of the pressure plate. Fixed blocks are symmetrically provided on the left and right sides of the first rack, and a rotating shaft is rotatably provided between the two fixed blocks. A drive gear is provided on the rotating shaft, and the drive gear meshes with the first rack. A connecting strip is provided behind the mounting base, and a second rack is provided at the rear end of the connecting strip. The second rack is perpendicular to the connecting strip and parallel to the first rack, and the second rack meshes with the drive gear.

[0013] Preferably, the bridge apron positioning plate is connected to the mounting base via a connecting mechanism. The connecting mechanism includes several positioning holes and several positioning posts. The positioning holes are arranged through the mounting base and are distributed in a circular array about the center of the mounting base. The positioning posts are slidably arranged in the positioning holes. The upper end of the positioning post is fixedly connected to the lower surface of the bridge apron positioning plate. The lower end of the positioning hole is slidably arranged with a telescopic post. The upper end of the telescopic post is provided with a drive rod. The lower end of the telescopic post extends into the telescopic sleeve and is provided with a first spring. The telescopic sleeve is connected to the upper surface of the base. A drive assembly is provided between the drive rod and the positioning post. A clamping assembly is provided on the outer wall of the mounting base. The drive assembly is used to drive the clamping assembly to clamp the outer wall of the bridge apron positioning plate.

[0014] Preferably, the clamping assembly includes a fixed plate, and several fixed plates are provided. Each fixed plate corresponds to a number of positioning holes. One end of the fixed plate is fixedly connected to the outer wall of the mounting base. A rotating column is rotatably provided at the other end of the fixed plate. The rotating column is fixedly connected to the center of the rotating rod. A pressure block is provided at the upper end of the rotating rod. The pressure block is made of anti-slip rubber material. A second spring is provided at the lower end of the rotating rod. One end of the second spring is connected to the lower end of the rotating rod, and the other end of the second spring is connected to the outer wall of the mounting base.

[0015] Preferably, the drive assembly includes a sliding hole and a mounting plate. The sliding hole is disposed within the mounting base, located between the rotating rod and the positioning hole. One end of the sliding hole communicates with the positioning hole. A drive shaft is slidably disposed within the sliding hole. Rollers are provided at both ends of the drive shaft. A third spring is sleeved outside the drive shaft, with one end connected to the outer wall of the drive shaft and the other end connected to the outer wall of the mounting base. The mounting plate is disposed within the positioning hole, located between the drive rod and the positioning post. A slider is slidably disposed at the center of the mounting plate, and a sliding plate is disposed at the upper end of the slider. The sliding plate is slidably connected to the inner wall of the positioning hole. The sliding plate and the mounting plate are connected... A fourth spring is provided between the slider and the upper end of the sliding cavity is connected to the positioning hole through a first through hole, and the lower end of the sliding cavity is connected to the positioning hole through a second through hole. A first sliding post is slidably arranged in the first through hole, and the lower end of the first sliding post extends into the sliding cavity and is provided with a first sliding plate. The first sliding plate is slidably connected to the inner wall of the sliding cavity. A second sliding post is slidably arranged in the second through hole, and the lower end of the second sliding post extends into the positioning hole. The upper end of the second sliding post extends into the sliding cavity and is provided with a second sliding plate. The second sliding plate is slidably connected to the inner wall of the sliding cavity. The second sliding plate and the first sliding plate are connected by a fifth spring.

[0016] The technical solution of this invention has the following advantages: This invention provides a positioning device for welding automotive rear axles, relating to the field of rear axle welding technology. It includes a base, with sleeve fixing mechanisms symmetrically arranged on the left and right sides of the base. A base is located at the center of the base, and an axle housing lifting motor is located at the bottom of the base. A lifting shaft is located at the output end of the axle housing lifting motor, and a mounting seat is located at the upper end of the lifting shaft. An axle housing positioning plate is located on the mounting seat, and the axle housing positioning plate is detachably connected to the mounting seat. In this invention, the sleeve fixing mechanisms on the left and right sides can respectively fix the left and right half-axle sleeves. Then, the axle housing is installed on the axle housing positioning plate. Welding guns are respectively installed at the connection points between the axle housing and the left and right half-axle sleeves. Welding guns can be used to simultaneously weld both sides of the axle housing. Through the above positioning device, the three components of a three-section rear axle of an automobile can be positioned and welded simultaneously, thereby improving welding efficiency, reducing the research and development and manufacturing costs of production equipment, and reducing the investment in the production line.

[0017] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the means particularly pointed out in the written description and the accompanying drawings.

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of a positioning device for welding a rear axle of an automobile according to the present invention.

[0021] Figure 2 This is a schematic diagram of the bridge lifting motor in this invention;

[0022] Figure 3 This is a schematic diagram of the internal structure of the power box and rotating box in this invention;

[0023] Figure 4 This is a front view of a positioning device for welding a rear axle of an automobile according to the present invention.

[0024] Figure 5 For the present invention Figure 4 Partial sectional view at point AA;

[0025] Figure 6 For the present invention Figure 5 Enlarged view of the structure at point B in the middle;

[0026] Figure 7This is a front view of the mounting base of the present invention;

[0027] Figure 8 This is a schematic diagram of the internal structure of the mounting base of the present invention;

[0028] Figure 9 For the present invention Figure 8 Enlarged view of the structure at point C;

[0029] Figure 10 For the present invention Figure 9 Enlarged view of the structure at point D.

[0030] In the diagram: 1. Base; 2. Base plate; 3. Bridge package lifting motor; 4. Mounting seat; 5. Bridge package positioning plate; 6. Bridge package lifting spacer; 7. Guide column; 8. Push cylinder; 9. Power box; 10. Rotary motor; 11. Rotary box; 12. Clamping cylinder; 13. Clamping head; 14. Tensioning cylinder; 15. Flange expansion sleeve; 16. Fixing oil ring; 17. Linear guide rail; 18. Slide table; 19. Adjusting connecting sleeve; 20. Adjusting connecting shaft; 21. Sleeve support block; 22. Fixing vertical plate; 23. First rack; 24. Fixing horizontal plate; 25. Telescopic shaft; 26. Pressure plate; 27. Pressure strip; 28. Fixing 29. Block; 30. Rotating shaft; 31. Drive gear; 32. Connecting bar; 33. Second rack; 34. Positioning hole; 35. Positioning post; 36. Telescopic post; 37. Drive rod; 38. Telescopic sleeve; 39. Fixing plate; 40. Rotating post; 41. Rotating rod; 42. Pressure block; 43. Second spring; 44. Sliding hole; 45. Drive shaft; 46. Roller; 47. Mounting plate; 48. Slider; 49. Sliding plate; 50. Fourth spring; 51. Sliding cavity; 52. First sliding post; 53. First sliding plate; 54. Second sliding post; 55. Second sliding plate; 56. Fifth spring. Detailed Implementation

[0031] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0032] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0033] Example 1:

[0034] This invention provides a positioning device for welding automotive rear axles, such as... Figures 1-10 As shown, it includes: a base 1, sleeve fixing mechanisms symmetrically arranged on the left and right sides of the base 1, a base 2 arranged at the center of the base 1, a bridge package lifting motor 3 arranged at the bottom of the base 2, a lifting shaft arranged at the output end of the bridge package lifting motor 3, a mounting seat 4 arranged at the upper end of the lifting shaft, a bridge package positioning plate 5 arranged on the mounting seat 4, and the bridge package positioning plate 5 and the mounting seat 4 are detachably connected.

[0035] The working principle and beneficial effects of the above technical solution are as follows: During welding, the bridge axle is first installed on the bridge axle positioning plate 5. Then, the left half-shaft sleeve is fixed by the sleeve fixing mechanism on the left side, and the right half-shaft sleeve is fixed by the sleeve fixing mechanism on the right side. At this time, all three components of the three-section rear axle are fixed by the positioning device. Controlling the bridge axle lifting motor 3 to rise can drive the mounting base 4 to rise through the lifting shaft. The rise of the mounting base 4 drives the bridge axle positioning plate 5 and the bridge axle on the bridge axle positioning plate 5 to rise, thereby adjusting the position of the bridge axle so that the bridge axle and the two half-shaft sleeves are arranged concentrically, ensuring the welding... To improve quality, welding torches are installed at the welding positions of the axle housing and the half-shaft sleeves. Two welding torches can simultaneously weld the axle housing to the left and right half-shaft sleeves, accelerating the welding speed and eliminating the need for step-by-step welding. The axle housing positioning plate 5 and the mounting base 4 are detachably connected, facilitating the replacement of the axle housing positioning plate 5 to accommodate different axle housing models and enabling rapid product switching. Through the aforementioned positioning device, the three components of the three-section rear axle of an automobile can be positioned and welded simultaneously, thereby improving welding efficiency, reducing the research and development and manufacturing costs of production equipment, and minimizing investment in the production line.

[0036] Example 2

[0037] Based on the above embodiment 1, as follows Figure 1 , Figure 2As shown, a bridge package positioning and lifting assembly is provided between the mounting base 4 and the base 2. The bridge package positioning and lifting assembly includes several bridge package lifting spacers 6. The several bridge package lifting spacers 6 are arranged in a circular array about the center of the lifting shaft. The bridge package lifting spacers 6 are set on the base 2. The lower end of the bridge package lifting spacer 6 extends to the bottom of the base 2. A guide post 7 is slidably arranged inside the bridge package lifting spacer 6. The upper end of the guide post 7 is connected to the lower surface of the mounting base 4.

[0038] The working principle and beneficial effects of the above technical solution are as follows: When the bridge package lifting motor 3 controls the lifting of the mounting base 4, the guide column 7 can slide up and down within the bridge package lifting sleeve 6, thereby providing guidance for the lifting of the mounting base 4, improving the stability of the lifting of the mounting base 4, avoiding positional deviation caused by distance swaying during the lifting of the bridge package, improving the accuracy of the welding position, and ensuring the welding quality.

[0039] Example 3

[0040] Based on Example 1 or 2, such as Figures 1-4 As shown, the sleeve fixing mechanism includes a propulsion cylinder 8, a propulsion shaft is provided at one end of the propulsion cylinder 8 near the bridge package positioning plate 5, a power box 9 is provided at one end of the propulsion shaft near the bridge package positioning plate 5, a rotary motor 10 is provided inside the power box 9, a rotary shaft is provided at the output end of the rotary motor 10, a rotary box 11 is provided at the end of the rotary shaft near the bridge package positioning plate 5, clamping cylinders 12 are symmetrically arranged on the front and rear sides of the rotary box 11, a clamping head 13 is provided at the output end of the clamping cylinder 12, and the clamping head 13 is located on the side of the rotary box 11 near the bridge package positioning plate 5;

[0041] A tensioning cylinder 14 is installed inside the rotating box 11. A tensioning shaft is installed at one end of the tensioning cylinder 14 near the bridge positioning plate 5. A flange expansion sleeve 15 is installed at the other end of the tensioning shaft near the bridge positioning plate 5. The flange expansion sleeve 15 is located between the clamping head 13 and the rotating box 11.

[0042] A fixed oil ring 16 is provided between the rotary box 11 and the power box 9. The fixed oil ring 16 is connected to the oil circuits of the propulsion cylinder 8, the clamping cylinder 12 and the tensioning cylinder 14 respectively.

[0043] Two linear guide rails 17 are arranged along the length of the base 1. The two linear guide rails 17 are symmetrically arranged on the front and rear sides of the power box 9. A slide table 18 is slidably arranged between the two linear guide rails 17. The upper surface of the slide table 18 is connected to the bottom wall of the power box 9. An adjustment connecting sleeve 19 is provided on the upper surface of the slide table 18. An adjustment connecting shaft 20 is slidably arranged inside the adjustment connecting sleeve 19. The end of the adjustment connecting shaft 20 near the base 2 is connected to the sleeve support block 21 through an adjustment connecting plate. A V-shaped opening is provided at the upper end of the sleeve support block 21.

[0044] The working principle and beneficial effects of the above technical solution are as follows: The sleeve fixing mechanism can realize the positioning, clamping and rotation of the half-shaft sleeve. Specifically, the rotary motor 10 can realize the rotation of the rotary box 11 through the rotary shaft, and the push cylinder 8 can realize the connection between the half-shaft sleeve and the bridge package. When installing the half-shaft sleeve, the flange head side of the half-shaft sleeve is installed to the flange head expansion sleeve 15, and the outer wall of the half-shaft sleeve is located between the clamping heads 13. After the half-shaft sleeve is placed in place, the hydraulic oil is supplied to the two clamping cylinders 12 and the middle tensioning cylinder 14 on the rotary box 11 through the oil passage on the fixing oil ring 16. The tensioning cylinder 14 is pushed out, driving the connected tensioning shaft to extend towards the bridge package positioning plate 5. Under the squeezing action of the tensioning shaft, the outer diameter of the flange head expansion sleeve 15 is expanded, which can expand the half-shaft sleeve. The inner hole of the sleeve flange is expanded and positioned, while the clamping head 13 clamps the outer wall of the half-shaft sleeve to ensure the coaxiality of the bearing holes at both ends of the axle housing after welding, and to prevent runout of the flange end faces at both ends, thereby ensuring welding quality. After the half-shaft sleeve is clamped, the propulsion cylinder 8 is activated, which pushes the power box 9 towards the axle housing positioning plate 5. The axle housing is installed on the axle housing positioning plate 5. The power box 9 drives the slide table 18 to slide along the linear guide rail 17, thereby driving the half-shaft sleeve to move stably towards the axle housing. The lifting motor 3 can adjust the height of the axle housing, ensuring that the axle housing and the half-shaft sleeve are arranged concentrically. When the end face of the half-shaft sleeve contacts the axle housing, the propulsion cylinder 8 is closed. The connection between the half-shaft sleeve and the axle housing is supported and centered by the sleeve support block 21 with a V-shaped opening, ensuring the concentric setting of the axle housing and the half-shaft sleeve, further guaranteeing the welding quality. Furthermore, the position of the sleeve support tube can be adjusted by adjusting the extension and retraction of the connecting shaft 20, thus facilitating quick product switching and adapting to the welding of rear axles of different vehicle models. During welding, the connection between the half-shaft sleeve and the axle housing is first welded using two welding guns, with the welding angle not exceeding 180 degrees. Then, the axle housing lifting motor 3 is controlled to descend, causing the axle housing to separate from the axle housing positioning plate 5. At this point, the rotation motor 10 can be used to control the rotation of the half-shaft sleeve and the axle housing, thereby realizing the rotational welding of the axle housing and the left and right half-shaft sleeves of the three-section rear axle of the automobile. The positioning device has precise and reliable positioning, which can improve the welding speed while ensuring the welding quality, thereby achieving flexible production and reducing manufacturing costs.

[0045] Example 4

[0046] Based on any one of Examples 1-3, such as Figures 4-6As shown, a fixed vertical plate 22 is provided behind the base 2. A first rack 23 is slidably provided on the side of the fixed vertical plate 22 near the mounting base 4. A fixed horizontal plate 24 is provided at the upper end of the first rack 23. The fixed horizontal plate 24 extends to the top of the bridge axle positioning plate 5 near the mounting base 4. Telescopic shafts 25 are provided on the lower surfaces of the left and right ends of the fixed horizontal plate 24. Two telescopic shafts 25 are symmetrically arranged on the left and right sides of the bridge axle positioning plate 5. A pressure plate 26 is provided at the lower end of the telescopic shaft 25. The pressure plate 26 is semi-circular. A pressure strip 27 is provided on the lower surface of the pressure plate 26. Fixed blocks 28 are symmetrically arranged on the left and right sides of the first rack 23. A rotating shaft 29 is rotatably arranged between the two fixed blocks 28. A drive gear 30 is provided on the rotating shaft 29. The drive gear 30 meshes with the first rack 23. A connecting strip 31 is provided behind the mounting base 4. A second rack 32 is provided at the rear end of the connecting strip 31. The second rack 32 is perpendicular to the connecting strip 31 and parallel to the first rack 23. The second rack 32 meshes with the drive gear 30.

[0047] The working principle and beneficial effects of the above technical solution are as follows: After the bridge package is installed on the bridge package positioning plate 5, the lifting shaft of the bridge package lifting motor 3 extends upward, and the lifting shaft drives the mounting base 4 to move upward. The upward movement of the mounting base 4 drives the second rack 32 to move upward through the connecting strip 31. The second rack 32 meshes with the drive gear 30, driving the drive gear 30 to rotate. The rotation of the drive gear 30 drives the first rack 23 to move downward. The first rack 23 drives the telescopic shaft 25 to move closer to the bridge package through the fixed horizontal plate 24. The pressure strip 27 then contacts the upper surface of the end of the bridge package. Through the downward pressure of the two pressure strips 27, the bridge package is fixed on the bridge package positioning plate 5, preventing the bridge package from shaking during the welding process. After the bridge package and the half shaft sleeve are welded at the preset angle, the bridge package lifting motor 3 controls the lifting shaft to retract downward, so that the bridge package positioning plate 5 and the pressure strip 27 are separated from the bridge package respectively, without affecting the rotation of the bridge package, ensuring the completion of the rotational welding of the bridge package and the half shaft sleeve.

[0048] Example 5

[0049] Based on any one of Examples 1-4, such as Figures 7-10 As shown, the bridge apron positioning disk 5 is connected to the mounting base 4 through a connecting mechanism. The connecting mechanism includes several positioning holes 33 and several positioning posts 34. The positioning holes 33 are arranged through the mounting base 4 and are distributed in a circular array about the center of the mounting base 4. The positioning posts 34 are slidably arranged in the positioning holes 33. The upper end of the positioning post 34 is fixedly connected to the lower surface of the bridge apron positioning disk 5. The lower end of the positioning hole 33 is slidably arranged with a telescopic post 35. The upper end of the telescopic post 35 is provided with a drive rod 36. The lower end of the telescopic post 35 extends into the telescopic sleeve 37 and is provided with a first spring. The telescopic sleeve 37 is connected to the upper surface of the base 2. A drive assembly is provided between the drive rod 36 and the positioning post 34. A clamping assembly is provided on the outer wall of the mounting base 4. The drive assembly is used to drive the clamping assembly to clamp the outer wall of the bridge apron positioning disk 5.

[0050] The working principle and beneficial effects of the above technical solution are as follows: In the existing system, the axle mounting plate 5 is connected to the mounting base 4 via bolts. However, due to differences in axle housings for different vehicle models, different axle mounting plates 5 need to be replaced when welding different rear axles. Therefore, with the increase in the number of model changes, the connecting bolts between the axle mounting plate 5 and the mounting base 4 are prone to stripping. Furthermore, if the threaded holes inside the mounting base 4 are damaged, the entire system needs to be replaced, resulting in high costs. Therefore, this solution uses a connecting mechanism to quickly connect the axle mounting plate 5 and the mounting base 4. A uniform positioning post 34 is set at the bottom of the axle mounting plate 5. When installing the axle mounting plate 5, the positioning post 34 is aligned with the positioning hole 33 inside the mounting base 4. Then, the positioning post 34 slides along the positioning hole 33, allowing the axle mounting plate 5 to be smoothly placed on the mounting base 4. The positioning post 34 drives the drive assembly to move, thereby controlling the movement of the clamping assembly. The clamping assembly then presses the outer wall of the axle mounting plate 5, thus achieving the connection between the axle mounting plate 5 and the mounting base 4. The installation process does not require bolts, extending the service life of the axle mounting plate 5 and the mounting base 4.

[0051] Example 6

[0052] Based on Example 5, such as Figures 7-10 As shown, the clamping assembly includes a fixed plate 38, and several fixed plates 38 are provided. Each fixed plate 38 corresponds to a number of positioning holes 33. One end of the fixed plate 38 is fixedly connected to the outer wall of the mounting base 4, and the other end of the fixed plate 38 is rotatably provided with a rotating column 39. The rotating column 39 is fixedly connected to the center of the rotating rod 40. A pressure block 41 is provided at the upper end of the rotating rod 40. The pressure block 41 is made of anti-slip rubber material. A second spring 42 is provided at the lower end of the rotating rod 40. One end of the second spring 42 is connected to the lower end of the rotating rod 40, and the other end of the second spring 42 is connected to the outer wall of the mounting base 4.

[0053] The drive assembly includes a sliding hole 43 and a mounting plate 47. The sliding hole 43 is disposed within the mounting base 4 and is located between the rotating rod 40 and the positioning hole 33. One end of the sliding hole 43 communicates with the positioning hole 33. A drive shaft 44 is slidably disposed within the sliding hole 43. Rollers 45 are provided at both ends of the drive shaft 44. A third spring 46 is sleeved on the outside of the drive shaft 44. One end of the third spring 46 is connected to the outer wall of the drive shaft 44, and the other end of the third spring 46 is connected to the outer wall of the mounting base 4. The mounting plate 47 is disposed within the positioning hole 33 and is located between the drive rod 36 and the positioning post 34. A slider 48 is slidably disposed at the center of the mounting plate 47. A sliding plate 49 is disposed at the upper end of the slider 48. The sliding plate 49 is slidably connected to the inner wall of the positioning hole 33. A fourth spring 50 is provided between the mounting plates 47. A sliding cavity 51 is provided inside the slider 48. The upper end of the sliding cavity 51 is connected to the positioning hole 33 through a first through hole, and the lower end of the sliding cavity 51 is connected to the positioning hole 33 through a second through hole. A first sliding post 52 is slidably provided in the first through hole. The lower end of the first sliding post 52 extends into the sliding cavity 51 and is provided with a first sliding plate 53. The first sliding plate 53 is slidably connected to the inner wall of the sliding cavity 51. A second sliding post 54 is slidably provided in the second through hole. The lower end of the second sliding post 54 extends into the positioning hole 33, and the upper end of the second sliding post 54 extends into the sliding cavity 51 and is provided with a second sliding plate 55. The second sliding plate 55 is slidably connected to the inner wall of the sliding cavity 51. The second sliding plate 55 and the first sliding plate 53 are connected by a fifth spring 56.

[0054] The working principle and beneficial effects of the above technical solution are as follows: When the bridge positioning plate 5 is placed on the mounting base 4, the positioning post 34 slides along the inner wall of the positioning hole 33. The positioning post 34 first contacts the upper end of the first sliding post 52, and then presses the first sliding post 52 downward, so that the first slide plate 53 slides downward along the inner wall of the sliding cavity 51. The fifth spring 56 is compressed. When the first sliding post 52 is pressed to be flush with the upper end of the sliding plate 49, the positioning post 34 contacts the upper surface of the sliding plate 49. The positioning post 34 presses the sliding plate 49 downward, the fourth spring 50 is compressed, and the sliding plate 49 drives the slider 48 to slide downward. The lower end of the second sliding post 54 is set as half. As the slider 48 slides downwards, the lower end of the second sliding post 54 contacts the outer wall of the roller 45 located at one end of the drive shaft 44 in the positioning hole 33. The second sliding post 54 presses against the outer wall of the roller 45, causing the roller 45 to drive the drive shaft 44 to move away from the positioning hole 33. The third spring 46 is stretched, and the drive shaft 44 pushes the rotating rod 40 to rotate through the external roller 45. The second spring 42 is stretched, and the rotating rod 40 drives the pressure block 41 to move closer to the bridge bag positioning plate 5. The pressure block 41 contacts the outer wall of the bridge bag positioning plate 5. The pressure blocks 41 arranged in four directions (front, back, left, and right) press the bridge bag positioning plate 5 firmly onto the mounting base 4. When the bridge bag positioning plate 5 is securely installed and needs to be replaced, the bridge bag lifting motor 3 is lowered, and the lifting shaft drives the mounting base 4 to move downward. The drive rod 36 at the upper end of the telescopic column 35 first contacts the lower end of the second sliding column 54. As the first spring is compressed, the drive rod 36 drives the second sliding column 54 to slide upward. The diameter of the drive rod 36 is smaller than the diameter of the second sliding column 54, so that the third spring 46 drives the drive shaft 44 to slide towards the positioning hole 33. The pressure block 41 separates from the outer wall of the bridge bag positioning plate 5. At this time, the bridge bag positioning plate 5 can be easily removed from the mounting base 4. By setting a connecting mechanism, the first sliding column 52 and the sliding... The moving plate 49 contacts the positioning post 34 respectively. The elastic force of the fourth spring 50 and the fifth spring 56 can gradually buffer the descent of the bridge bag positioning plate 5, avoiding the bridge bag positioning plate 5 from falling too fast and causing violent collision damage with the mounting base 4. The driving component drives the clamping component to press the outer wall of the bridge bag positioning plate 5, which improves the stability of the bridge bag positioning plate 5 installation. When replacing the bridge bag positioning plate 5, it is only necessary to control the lifting shaft of the bridge bag lifting motor 3 to descend, so that the pressure block 41 can be separated from the outer wall of the bridge bag positioning plate 5, which facilitates the rapid change of the bridge bag positioning plate 5 and enables rapid product switching, thereby improving production efficiency and reducing manufacturing costs.

[0055] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A positioning device for welding a rear axle of an automobile, characterized in that, include: The base (1) has a sleeve fixing mechanism symmetrically arranged on the left and right sides. The base (1) has a base (2) in the center. The base (2) has a bridge bag lifting motor (3) at the bottom. The bridge bag lifting motor (3) has a lifting shaft at the output end. The lifting shaft has a mounting seat (4) at the upper end. The mounting seat (4) has a bridge bag positioning plate (5). The bridge bag positioning plate (5) and the mounting seat (4) are detachably connected. The bridge bag positioning plate (5) is connected to the mounting base (4) through a connecting mechanism. The connecting mechanism includes several positioning holes (33) and several positioning posts (34). Several positioning holes (33) are arranged through the mounting base (4). Several positioning holes (33) are arranged in a ring array about the center of the mounting base (4). Positioning posts (34) are slidably arranged in the positioning holes (33). The upper end of the positioning post (34) is fixedly connected to the lower surface of the bridge bag positioning plate (5). Telescopic post (35) is slidably arranged at the lower end of the positioning hole (33). A drive rod (36) is arranged at the upper end of the telescopic post (35). The lower end of the telescopic post (35) extends into the telescopic sleeve (37) and is provided with a first spring. The telescopic sleeve (37) is connected to the upper surface of the base (2). A drive assembly is arranged between the drive rod (36) and the positioning post (34). A clamping assembly is arranged on the outer wall of the mounting base (4). The drive assembly is used to drive the clamping assembly to clamp the outer wall of the bridge bag positioning plate (5). The clamping assembly includes a fixed plate (38), and several fixed plates (38) are provided. Several fixed plates (38) correspond one-to-one with several positioning holes (33). One end of the fixed plate (38) is fixedly connected to the outer wall of the mounting base (4). The other end of the fixed plate (38) is rotatably provided with a rotating column (39). The rotating column (39) is fixedly connected to the center of the rotating rod (40). The upper end of the rotating rod (40) is provided with a pressure block (41). The pressure block (41) is made of anti-slip rubber material. The lower end of the rotating rod (40) is provided with a second spring (42). One end of the second spring (42) is connected to the lower end of the rotating rod (40), and the other end of the second spring (42) is connected to the outer wall of the mounting base (4). The drive assembly includes a sliding hole (43) and a mounting plate (47). The sliding hole (43) is located inside the mounting base (4) and between the rotating rod (40) and the positioning hole (33). One end of the sliding hole (43) is connected to the positioning hole (33). A drive shaft (44) is slidably installed inside the sliding hole (43). Rollers (45) are provided at both ends of the drive shaft (44). A third spring (46) is sleeved on the outside of the drive shaft (44). One end of the third spring (46) is connected to the outer wall of the drive shaft (44), and the other end of the third spring (46) is connected to the outer wall of the mounting base (4). The mounting plate (47) is located inside the positioning hole (33) and between the drive rod (36) and the positioning post (34). A slider (48) is slidably installed at the center of the mounting plate (47). A sliding plate (49) is installed at the upper end of the slider (48). The sliding plate (49) is slidably connected to the inner wall of the positioning hole (33). (49) A fourth spring (50) is provided between the mounting plate (47). A sliding cavity (51) is provided inside the slider (48). The upper end of the sliding cavity (51) is connected to the positioning hole (33) through the first through hole. The lower end of the sliding cavity (51) is connected to the positioning hole (33) through the second through hole. A first sliding column (52) is slidably provided in the first through hole. The lower end of the first sliding column (52) extends into the sliding cavity (51) and a first sliding plate (53) is provided. The first sliding plate (53) is slidably connected to the inner wall of the sliding cavity (51). A second sliding column (54) is slidably provided in the second through hole. The lower end of the second sliding column (54) extends into the positioning hole (33). The upper end of the second sliding column (54) extends into the sliding cavity (51) and a second sliding plate (55) is provided. The second sliding plate (55) is slidably connected to the inner wall of the sliding cavity (51). The second sliding plate (55) and the first sliding plate (53) are connected by a fifth spring (56).

2. The positioning device for welding a rear axle of an automobile according to claim 1, characterized in that, A bridge package positioning and lifting assembly is provided between the mounting base (4) and the base (2). The bridge package positioning and lifting assembly includes several bridge package lifting spacers (6). The several bridge package lifting spacers (6) are arranged in a circular array about the center of the lifting shaft. The bridge package lifting spacers (6) are set on the base (2). The lower end of the bridge package lifting spacers (6) extends to the bottom of the base (2). A guide post (7) is slidably provided inside the bridge package lifting spacers (6). The upper end of the guide post (7) is connected to the lower surface of the mounting base (4).

3. The positioning device for welding a rear axle of an automobile according to claim 1, characterized in that, The sleeve fixing mechanism includes a propulsion cylinder (8), a propulsion shaft is provided at one end of the propulsion cylinder (8) near the bridge package positioning plate (5), a power box (9) is provided at one end of the propulsion shaft near the bridge package positioning plate (5), a rotary motor (10) is provided in the power box (9), a rotary shaft is provided at the output end of the rotary motor (10), a rotary box (11) is provided at one end of the rotary shaft near the bridge package positioning plate (5), clamping cylinders (12) are symmetrically arranged on the front and rear sides of the rotary box (11), a clamping head (13) is provided at the output end of the clamping cylinder (12), and the clamping head (13) is located on the side of the rotary box (11) near the bridge package positioning plate (5).

4. A positioning device for welding a rear axle of an automobile according to claim 3, characterized in that, A tensioning cylinder (14) is installed inside the rotating box (11). A tensioning shaft is installed at one end of the tensioning cylinder (14) near the bridge positioning plate (5). A flange expansion sleeve (15) is installed at one end of the tensioning shaft near the bridge positioning plate (5). The flange expansion sleeve (15) is located between the clamping head (13) and the rotating box (11).

5. A positioning device for welding a rear axle of an automobile according to claim 4, characterized in that, A fixed oil ring (16) is provided between the rotating box (11) and the power box (9). The fixed oil ring (16) is connected to the oil circuits of the propulsion cylinder (8), the clamping cylinder (12) and the tensioning cylinder (14).

6. A positioning device for welding a rear axle of an automobile according to claim 3, characterized in that, Two linear guide rails (17) are arranged along the length of the base (1). The two linear guide rails (17) are symmetrically arranged on the front and rear sides of the power box (9). A slide table (18) is slidably arranged between the two linear guide rails (17). The upper surface of the slide table (18) is connected to the bottom wall of the power box (9). An adjustment connecting sleeve (19) is arranged on the upper surface of the slide table (18). An adjustment connecting shaft (20) is slidably arranged inside the adjustment connecting sleeve (19). The end of the adjustment connecting shaft (20) near the base (2) is connected to the sleeve support block (21) through the adjustment connecting plate. A V-shaped opening is provided at the upper end of the sleeve support block (21).

7. A positioning device for welding a rear axle of an automobile according to claim 1, characterized in that, A fixed vertical plate (22) is provided behind the base (2). A first rack (23) is slidably provided on the side of the fixed vertical plate (22) near the mounting base (4). A fixed horizontal plate (24) is provided at the upper end of the first rack (23). The fixed horizontal plate (24) extends to the top of the bridge bag positioning plate (5) at one end near the mounting base (4). Telescopic shafts (25) are provided on the lower surfaces of the left and right ends of the fixed horizontal plate (24). The two telescopic shafts (25) are symmetrically arranged on the left and right sides of the bridge bag positioning plate (5). A pressure plate (26) is provided at the lower end of the telescopic shaft (25). The pressure plate (26) is semi-circular. The lower surface of the pressure plate (26) A pressure bar (27) is set, and fixed blocks (28) are symmetrically set on the left and right sides of the first rack (23). A rotating shaft (29) is rotatably set between the two fixed blocks (28). A drive gear (30) is set on the rotating shaft (29). The drive gear (30) meshes with the first rack (23). A connecting bar (31) is set on the rear side of the mounting base (4). A second rack (32) is set at the rear end of the connecting bar (31). The second rack (32) is perpendicular to the connecting bar (31) and parallel to the first rack (23). The second rack (32) meshes with the drive gear (30).

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