Automatic welding equipment for bridge housing accessories

Abstract

This utility model discloses an automatic welding equipment for axle housing accessories, relating to the automotive field. It includes a welding robot, a spindle box assembly, an active rotating assembly, a smoothing and centering assembly, a heating assembly, a square tube assembly, and a driven rotating assembly. The spindle box assembly includes a spindle box, a spindle reinforcing plate, a base, and a robot mounting plate. The robot mounting plate is mounted on the top surface of the spindle box, and the welding robot is mounted on the robot mounting plate. The square tube assembly is mounted on the spindle reinforcing plate. The smoothing and centering assembly, the heating assembly, the active rotating assembly, and the driven rotating assembly are mounted on the square tube assembly. This utility model solves the problems of existing equipment being unable to adapt to welding different types of axle accessories, unable to quickly adjust to different time and temperature conditions for automatic welding, requiring manual intervention and adjustments, and experiencing excessively rapid heating and cooling during welding, leading to high weld stress and easy cracking, low product quality and production efficiency, and high labor intensity for workers.

Description

Technical Field

[0001] This utility model relates to the field of automobile manufacturing technology, and in particular to a device for automatic welding of axle housing accessories. Background Technology

[0002] Most existing axle housing accessory welding equipment is only suitable for welding the same type of axle accessories. Furthermore, it cannot quickly adapt to different time and temperature settings for automatic welding, requiring manual intervention and adjustments. During automatic welding of axle housing accessories, the rapid heating time, coupled with natural cooling, especially in winter, results in excessively high hardness and stress within the weld, making the axle housing prone to cracking under complex operating conditions. This leads to low production efficiency and product quality. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an automatic welding equipment for axle housing accessories. It can solve the problems of existing axle housing accessory welding equipment, which cannot adapt to the welding of different types of axle accessories, cannot quickly adjust to different time and temperature for automatic welding, require manual intervention and adjustment, and have excessively fast heating and cooling times during welding, resulting in high weld stress and easy cracking, low product quality and production efficiency, and high labor intensity for workers.

[0004] To solve the above problems, the technical solution of this utility model is: this automatic welding equipment for bridge housing accessories includes a welding robot, a spindle box assembly, an active rotation assembly, a smoothing and centering assembly, a heating assembly, a square tube assembly, and a driven rotation assembly.

[0005] The spindle box assembly includes a spindle box, a spindle reinforcing plate, a base, and a robot mounting base plate. The spindle box is mounted on the top surface of the base. The spindle reinforcing plate consists of a vertical plate and a horizontal plate. The vertical plate is connected to the spindle inside the spindle box. The spindle drives the spindle reinforcing plate to rotate, facilitating the maintenance of different postures of the bridge housing during welding. The robot mounting base plate is mounted on the top surface of the spindle box, and the welding robot is mounted on the robot mounting base plate. The square tube assembly is mounted on the horizontal plate of the spindle reinforcing plate. The smoothing and centering assembly and the heating assembly are mounted on the middle part of the square tube assembly. The active rotation assembly and the driven rotation assembly are respectively mounted on the left and right parts of the square tube assembly.

[0006] A more specific solution to the above technical solution is that the square tube assembly is composed of multiple square tubes, and corresponding multiple rows of mounting holes are provided at the mounting positions of the smoothing and centering assembly, the heating assembly, the active rotating assembly, and the driven rotating assembly, thus enabling the production of bridge housing products of different lengths.

[0007] Furthermore: the smoothing and centering assembly includes a manual sliding block assembly, a bridge housing centering base plate, a middle support plate, a side support plate, a clamping block, a clamping seat, a wide-type pneumatic gripper, a cylinder fixing seat, an M30×1.5 nut seat, a guide shaft, a fixing plate, a linear bearing, and an electric cylinder.

[0008] The axle housing centering base plate is bolted to the square tube assembly, and the manually adjustable slide assembly is installed at both ends of the axle housing centering base plate. The manually adjustable slide assembly is adapted to different axle housing lengths. The X-shaped centering clamp on the manually adjustable slide assembly ensures consistent three-jaw gripping. The intermediate support plate is installed in the middle of the axle housing centering base plate and supported by the side support plate. The clamping block is installed on the clamping seat and driven by the wide-type pneumatic gripper. The cylinder fixing seat is installed on the bottom surface of the middle part of the axle housing centering base plate through the M30×1.5 nut seat. The four guide shafts are installed between the fixing plate and the axle housing centering base plate, and the lower linear bearing and the electric cylinder are installed under the fixing plate.

[0009] Furthermore: the heating assembly includes a vertical plate, a mounting block, a cylinder, a heating tube, and a heating stroke limiting block; the vertical plate consists of a horizontal mounting plate and a vertical support plate. The horizontal mounting plate has a long fixing hole at its end, through which the vertical plate is bolted to the square tube assembly. The long fixing hole design allows for adjustment of the left and right assemblies, accommodating different accessory center distances. The vertical mounting plate has a moving groove for the heating tube to move up and down. The cylinder is mounted at the bottom of the vertical mounting plate, and its piston rod is connected to the mounting block. The end of the heating tube passes through the moving groove and is fixed to the mounting block, driven up and down by the cylinder. The heating tube is detachable, allowing it to be used with weld seam accessories of different shapes. A heating stroke limiting block is located next to the moving groove to limit the heating stroke. The heating stroke limiting block has a limiting screw, allowing the heating tube to be adjusted up and down to accommodate different accessory heights.

[0010] Furthermore: the active rotation assembly includes a lead screw structure and a clamping power box; the entire active rotation assembly is mounted on the square tube assembly via an active rotation assembly mounting base; the lead screw structure allows the clamping length of the pneumatic three-jaw jack to be adjusted to accommodate bridge housings of different lengths.

[0011] The lead screw structure includes an adjusting lead screw and a chuck moving cylinder installed inside a lead screw structure mounting box; one end of the adjusting lead screw extends out of the lead screw structure mounting box and is connected to a handwheel, and the other end is connected to the chuck moving cylinder and installed on a lead screw fixing seat; the lead screw fixing seat is connected to an adjusting slider, and the adjusting slider can move along an adjusting slider guide rail, which is installed at the bottom of the lead screw structure mounting box; the chuck moving cylinder is installed on a chuck moving cylinder fixing seat.

[0012] The power spindle is mounted in the clamping power box via a power spindle bearing. One end of the power spindle is connected to a pneumatic three-jaw chuck, which clamps the bridge housing and rotates under the drive of the power spindle to adjust the welding posture of the bridge housing. The power spindle is driven by a motor drive system.

[0013] A power box support plate is installed on the top surface of the screw structure mounting box of the power box. The two sides of the power box support plate serve as guide rails, and the long slider can move along the guide rails. The power box is mounted on the long slider.

[0014] Furthermore: the motor drive system that drives the power spindle in the active rotary assembly includes a motor, a worm gear, a worm shaft, and a coupling.

[0015] The worm gear is mounted on the power main shaft, meshes with the transmission worm, is connected to a coupling, and is connected to a motor located outside the power box. The motor drives the pneumatic three-jaw chuck through the worm gear transmission mechanism.

[0016] Furthermore, the structure and function of the components of the driven rotating assembly are the same as those of the other components of the active rotating assembly, except for the motor drive system of the active rotating assembly.

[0017] Furthermore, the robot mounting base plate has multiple interfaces, and the installation distance for mounting the welding robot is adjustable.

[0018] Furthermore, all square tubes in the square tube assembly are hollow seamless square tubes with a specification of 160×80×6, which reduces their own weight while ensuring the load-bearing capacity.

[0019] Furthermore: a spacer is provided on the power spindle section between the turbine gear and the power spindle bearing in the active rotary assembly; a power spindle cover is provided on the power spindle extending from the rear of the power box.

[0020] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0021] This invention is applicable to welding various axle accessories, enabling rapid adjustment to adapt to different time and temperature conditions for automatic welding, while reducing manual intervention time and the number of adjustments required. This method involves inputting parameters onto a platform for automatic welding, making it suitable for mass production, improving product quality, increasing production efficiency, and reducing worker workload. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2This is a schematic diagram of the main view of this utility model;

[0024] Figure 3 This is a top view of the present invention;

[0025] Figure 4 This is a schematic diagram of the left side of this utility model;

[0026] Figure 5 This is a schematic diagram of the overall three-dimensional structure of the spindle box of this utility model;

[0027] Figure 6 This is a front view schematic diagram of the spindle box assembly of this utility model;

[0028] Figure 7 This is a top view schematic diagram of the spindle box assembly of this utility model;

[0029] Figure 8 This is a left-side view of the spindle box assembly of this utility model;

[0030] Figure 9 This is a schematic diagram of the three-dimensional structure of the active rotation assembly of this utility model;

[0031] Figure 10 This is a cross-sectional schematic diagram of the active rotating assembly of this utility model;

[0032] Figure 11 This is a top view schematic diagram of the active rotation assembly of this utility model;

[0033] Figure 12 This is a schematic diagram of the overall three-dimensional structure of the smoothing component of this utility model;

[0034] Figure 13 This is a schematic diagram of the main view of the smoothing and splitting assembly of this utility model;

[0035] Figure 14 This is a top view schematic diagram of the smoothing and splitting assembly of this utility model;

[0036] Figure 15 This is a left-side view schematic diagram of the smoothing and splitting assembly of this utility model;

[0037] Figure 16 This is a schematic diagram of the three-dimensional structure of the heating assembly of this utility model;

[0038] Figure 17 This is a front view schematic diagram of the heating assembly of this utility model;

[0039] Figure 18 This is a top view schematic diagram of the heating assembly of this utility model;

[0040] Figure 19 This is a left-side view of the heating assembly of this utility model;

[0041] Figure 20 This is a schematic diagram of the three-dimensional structure of the square tube assembly of this utility model;

[0042] Figure 21 This is a front view schematic diagram of the square tube assembly of this utility model;

[0043] Figure 22 This is a top view schematic diagram of the square tube assembly of this utility model;

[0044] Figure 23 This is a left-side view of the square tube assembly of this utility model;

[0045] Figure 24 This is a schematic diagram of the three-dimensional structure of the driven rotation assembly of this utility model;

[0046] Figure 25 This is a cross-sectional schematic diagram of the driven rotary assembly of this utility model;

[0047] Figure 26 This is a top view schematic diagram of the driven rotating assembly of this utility model.

[0048] The labels in the diagram represent: 1. Welding robot, 2. Spindle box assembly, 2-1. Spindle box, 2-2. Spindle reinforcing plate, 2-3. Base, 2-4. Robot mounting base plate.

[0049] 3. Active rotating assembly; 3-1. Power box; 3-2. Power spindle; 3-3. Pneumatic three-jaw chuck; 3-4. Long slider; 3-5. Active rotating assembly mounting base; 3-6. Motor; 3-7. Power box support plate; 3-8. Handwheel; 3-9. Power spindle cover; 3-10. Worm gear; 3-11. Power spindle bearing; 3-12. Spacer; 3-13. Coupling; 3-14. Transmission worm gear; 3-15. Adjusting screw; 3-16. Chuck moving cylinder; 3-17. Screw mounting base; 3-18. Adjusting slider; 3-19. Chuck moving cylinder mounting base; 3-20. Screw structure mounting box; 3-21. Adjusting slider guide rail; 4. Smoothing centering assembly; 4-1. Manually adjustable slide assembly; 4-2. Axle housing centering base plate; 4-3. Intermediate support plate, 4-4. Side support plate, 4-5. Clamping block, 4-6. Clamping seat, 4-7. Wide-type pneumatic gripper, 4-8. Cylinder fixing seat, 4-9. M30×1.5 nut seat, 4-10. Guide shaft, 4-11. Fixing plate, 4-12. Linear bearing, 4-13. Electric cylinder, 5. Heating assembly, 5-1. Vertical plate, 5-2. Mounting block, 5-3. Cylinder, 5-4. Heating tube, 5-5. Heating stroke limit block, 6. Square tube assembly, 6-1. L1 square tube, 6-2. L2 square tube, 6-3. L3 square tube, 6-4. L4 square tube, 7. Driven rotating assembly, 8. Bridge housing. Detailed Implementation

[0050] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0051] Figure 1 , Figure 2 , Figure 3 and Figure 4 The automatic welding equipment for bridge housing accessories includes a welding robot 1, a spindle box assembly 2, an active rotary assembly 3, a smoothing and centering assembly 4, a heating assembly 5, a square tube assembly 6, and a driven rotary assembly 7.

[0052] The spindle box assembly 2 supports the entire equipment and the transverse rotating bridge housing 8, allowing for rapid adjustment to different positions required by the welding torch. For example... Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the spindle box assembly 2 includes a spindle box 2-1, a spindle reinforcing plate 2-2, a base 2-3, and a robot mounting base plate 2-4. The spindle box 2-1 is mounted on the top surface of the base 2-3. The spindle reinforcing plate 2-2 consists of a vertical plate and a horizontal plate. The vertical plate is connected to the spindle inside the spindle box 2-1. The spindle drives the spindle reinforcing plate 2-2 to rotate so that the bridge housing 8 can maintain different postures during the welding process. The robot mounting base plate 2-4 is mounted on the top surface of the spindle box 2-1. The welding robot 1 is mounted on the robot mounting base plate 2-4. Because the robot mounting base plate 2-4 uses multiple interface types, the mounting distance of the welding robot 1 is adjustable.

[0053] The square tube assembly 6 is mounted on the horizontal plate of the main shaft reinforcing plate 2-2. The smoothing and centering assembly 4 and the heating assembly 5 are mounted on the middle part of the square tube assembly 6. The active rotation assembly 3 and the driven rotation assembly 7 are mounted on the left and right sides of the square tube assembly 6, respectively.

[0054] like Figure 20 , Figure 21 , Figure 22 and Figure 23 As shown, the square tube assembly 6 is composed of multiple longitudinal and transverse square tubes of varying lengths. For example, the square tube base includes two longitudinally long L3 square tubes 6-3 and six of the shortest transverse L4 square tubes 6-4. The mounting positions of the active and passive rotating assemblies at both ends are respectively composed of two shorter transverse L1 square tubes 6-1 and two shorter longitudinal L2 square tubes 6-2. Corresponding mounting holes are provided for the mounting positions of the smoothing and centering assembly 4, the heating assembly 5, the active rotating assembly 3, and the passive rotating assembly 7, which can accommodate bridge housing products of different lengths. All square tubes use hollow seamless square tubes with a specification of 160×80×6, which can reduce their own weight while ensuring the load-bearing capacity.

[0055] The smoothing and centering assembly 4 can precisely position the axle housing 8, ensuring welding consistency, and has a vertical lifting function without interference when the axle housing rotates. For example... Figure 12 , Figure 13 , Figure 14 and Figure 15 As shown; the smoothing and centering assembly 4 includes a manual sliding block assembly 4-1, a bridge housing centering base plate 4-2, a middle support plate 4-3, a side support plate 4-4, a clamping block 4-5, a clamping seat 4-6, a wide-type pneumatic gripper 4-7, a cylinder fixing seat 4-8, an M30×1.5 nut seat 4-9, a guide shaft 4-10, a fixing plate 4-11, a linear bearing 4-12, and an electric cylinder 4-13.

[0056] The axle housing centering base plate 4-2 is bolted to the square tube assembly 6. Manually adjustable slide assemblies 4-1 are installed at both ends of the axle housing centering base plate 4-2. The adjusting seats of the manually adjustable slide assemblies 4-1 are movable to accommodate different axle housing lengths. The X-position on the manually adjustable slide assemblies 4-1 is centered and clamped to ensure consistent three-jaw gripping. The intermediate support plate 4-3 is installed in the middle of the axle housing centering base plate 4-2 and is supported by the side support plates 4-4. The clamping block 4-5 is installed on the clamping seat 4-6 and is driven by the wide pneumatic gripper 4-7.

[0057] The cylinder mounting base 4-8 is installed on the bottom center of the axle housing centering base plate 4-2 via an M30×1.5 nut seat 4-9; four guide shafts 4-10 are installed between the fixed plate 4-11 and the axle housing centering base plate 4-2; the lower linear bearing 4-12 and the electric cylinder 4-13 are installed under the fixed plate 4-11. The wide-type pneumatic grippers ensure consistent product alignment during each welding operation, and the electric cylinder provides vertical lifting, suitable for different axle housing heights.

[0058] The heating assembly 5 has a vertical lifting function, does not interfere with the rotation of the bridge housing 8, and the heating coil is interchangeable to adapt to different bridge housing products. For example... Figure 16 , Figure 17 , Figure 18 and Figure 19 As shown; the heating assembly 5 includes a vertical plate 5-1, a mounting block 5-2, a cylinder 5-3, a heating tube 5-4, and a heating stroke limit block 5-5.

[0059] The upright plate 5-1 consists of a horizontal mounting plate and a vertical support plate. The horizontal mounting plate has elongated fixing holes at its ends. The upright plate 5-1 is bolted to the square tube assembly 6 through these holes. The elongated design of the fixing holes allows for adjustment of the left and right assemblies, accommodating different accessory center distances. The vertical mounting plate has a vertical movement groove for the heating tube 5-4. A cylinder 5-3 is mounted at the bottom of the vertical mounting plate, with its piston rod connected to a mounting block 5-2. The end of the heating tube 5-4 passes through the movement groove and is fixed to the mounting block 5-2, driven up and down by the cylinder 5-3. The heating tube 5-4 is detachable, making it suitable for accessories with different weld seam shapes. A heating stroke limit block 5-5 is located next to the movement groove to limit the heating stroke. The heating stroke limit block 5-5 has a limiting screw, allowing the heating tube 5-4 to be adjusted vertically for different accessory heights.

[0060] The active rotating assembly 3 carries the bridge housing 8 and the transverse rotating bridge housing 8 to quickly achieve different postures required by the welding torch; while the driven rotating assembly 7 is installed opposite to the active rotating assembly 3 to assist the active rotating assembly 3 in clamping the rotating bridge housing 8, thereby reducing the load-bearing weight of the active rotating assembly 3.

[0061] like Figure 9 , Figure 10 and Figure 11 As shown, the active rotary assembly 3 includes a lead screw structure and a clamping power box 3-1; the entire active rotary assembly 3 is mounted on the square tube assembly 6 via an active rotary assembly mounting base 3-5. The lead screw structure allows the clamping length of the pneumatic three-jaw chuck 3-3 (the pneumatic three-jaw chuck is part of the chuck or three-jaw chuck) to be adjustable, adapting to bridge housings of different lengths and diameters.

[0062] The lead screw structure includes an adjusting lead screw 3-15 and a chuck moving cylinder 3-16 installed in the lead screw structure mounting box 3-20. One end of the adjusting lead screw 3-15 extends out of the lead screw structure mounting box 3-20 and is connected to a handwheel 3-8. The other end is connected to the chuck moving cylinder 3-16 and installed on the lead screw fixing seat 3-17. The lead screw fixing seat 3-17 is connected to the adjusting slider 3-18, which can move along the adjusting slider guide rail 3-21. The adjusting slider guide rail 3-21 is installed at the bottom of the lead screw structure mounting box 3-20. The chuck moving cylinder 3-16 is installed on the chuck moving cylinder fixing seat 3-19.

[0063] The power spindle 3-2 is mounted inside the clamping power box 3-1 via a power spindle bearing 3-11. One end of the power spindle 3-2 is connected to a pneumatic three-jaw chuck 3-3, which clamps the bridge housing and rotates under the drive of the power spindle 3-2 to adjust the welding posture of the bridge housing. A worm gear 3-10 is mounted on the section of the power spindle 3-2 inside the power box 3-1. The worm gear 3-10 meshes with a transmission worm 3-14, which is connected to a coupling 3-13. The coupling 3-13 is connected to a motor 3-6 located outside the power box 3-1. The motor 3-6 drives the pneumatic three-jaw chuck 3-3 via a worm gear transmission mechanism. A spacer 12 is provided on the section of the power spindle 3-2 between the worm gear 3-10 and the power spindle bearing 3-11. A power spindle guard 3-9 is provided on the power spindle 3-2 extending out of the tail of the power box 3-1. A power box support plate 3-7 is installed on the top surface of the screw structure mounting box 3-20. The two sides of the power box support plate 3-7 serve as guide rails, and the long slider 3-4 can move along the guide rails. The power box 3-1 is installed on the long slider 3-4.

[0064] like Figure 24 , Figure 25 and Figure 26 As shown, the driven rotary assembly 7 lacks the motor drive system compared to the driving rotary assembly 3, but the structure and function of other components are the same as those of the driving rotary assembly 3.

[0065] The sequence of operations for this utility model is as follows: axle housing hoisting - smoothing and centering assembly positioning (manual sliding component and wide pneumatic gripper action) - electric cylinder rising - master and slave rotating assembly advancing - master and slave rotating assembly clamping - smoothing and centering assembly releasing (manual sliding component and wide pneumatic gripper action) - electric cylinder descending - heating assembly rising - heating time (seconds) - heating time completed - heating assembly descending - welding starting (welding while rotating in various postures) - alternating operation of motors in the spindle box and the active rotating assembly - repeated execution of heating and welding actions is allowed - welding completed - electric cylinder rising - smoothing and centering positioning manual sliding component and wide pneumatic gripper action - master and slave rotating assembly pneumatic three-jaw release - master and slave rotating assembly retraction - electric cylinder descending - smoothing and centering assembly wide pneumatic gripper release - axle housing unloading.

[0066] In the description of this utility model, it should be noted that the terms "middle", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. An axle housing attachment automatic welding apparatus characterized by: It includes a welding robot (1), a spindle box assembly (2), an active rotary assembly (3), a smoothing and centering assembly (4), a heating assembly (5), a square tube assembly (6), and a driven rotary assembly (7); The spindle box assembly (2) includes a spindle box (2-1), a spindle reinforcing plate (2-2), a base (2-3), and a robot mounting base plate (2-4); the spindle box (2-1) is mounted on the top surface of the base (2-3); the spindle reinforcing plate (2-2) consists of a vertical plate and a horizontal plate; the vertical plate is connected to the spindle inside the spindle box (2-1); the spindle drives the spindle reinforcing plate (2-2) to rotate, facilitating the maintenance of different postures of the bridge housing (8) during welding; the... The robot mounting base plate (2-4) is mounted on the top surface of the spindle box (2-1), and the welding robot (1) is mounted on the robot mounting base plate (2-4); the square tube assembly (6) is mounted on the horizontal plate of the spindle reinforcing plate (2-2), the smoothing and centering assembly (4) and the heating assembly (5) are mounted on the middle part of the square tube assembly (6), and the active rotation assembly (3) and the driven rotation assembly (7) are respectively mounted on the left and right parts of the square tube assembly (6).

2. The bridge assembly automatic welding apparatus of claim 1, wherein: The square tube assembly (6) is composed of multiple square tubes, and corresponding multiple rows of mounting holes are provided at the mounting positions of the smoothing and centering assembly (4), the heating assembly (5), the active rotating assembly (3), and the driven rotating assembly (7).

3. The bridge shell accessory automatic welding apparatus of claim 1 or 2, wherein: The smoothing and centering assembly (4) includes a manual sliding block assembly (4-1), a bridge housing centering base plate (4-2), a middle support plate (4-3), a side support plate (4-4), a clamping block (4-5), a clamping seat (4-6), a wide pneumatic gripper (4-7), a cylinder fixing seat (4-8), an M30×1.5 nut seat (4-9), a guide shaft (4-10), a fixing plate (4-11), a linear bearing (4-12), and an electric cylinder (4-13). The axle housing centering base plate (4-2) is bolted to the square tube assembly (6), and the manual sliding seat assembly (4-1) is installed at both ends of the axle housing centering base plate (4-2); the intermediate support plate (4-3) is installed in the middle of the axle housing centering base plate (4-2) and is supported by the side support plate (4-4); the clamping block (4-5) is installed on the clamping seat (4-6) and is driven by the wide pneumatic gripper (4-7); the cylinder fixing seat (4-8) is installed on the bottom surface of the middle part of the axle housing centering base plate (4-2) through the M30×1.5 nut seat (4-9); the guide shaft (4-10) is installed between the fixing plate (4-11) and the axle housing centering base plate (4-2), and the lower linear bearing (4-12) and the electric cylinder (4-13) are installed under the fixing plate (4-11).

4. The bridge assembly automatic welding apparatus of claim 3, wherein: The heating assembly (5) includes a vertical plate (5-1), a mounting block (5-2), a cylinder (5-3), a heating tube (5-4), and a heating stroke limiting block (5-5). The vertical plate (5-1) consists of a horizontal mounting plate and a vertical support plate. The end of the horizontal mounting plate is provided with a long fixing hole. The vertical plate (5-1) is mounted on the square tube assembly (6). The vertical mounting plate is provided with a moving groove. The cylinder (5-3) is mounted at the bottom of the vertical mounting plate. The piston rod of the cylinder (5-3) is connected to the mounting block (5-2). The end of the heating tube (5-4) passes through the moving groove and is fixed on the mounting block (5-2). The heating stroke limiting block (5-5) is provided next to the moving groove. The heating stroke limiting block (5-5) is provided with a limiting screw.

5. The bridge assembly automatic welding apparatus of claim 4, wherein: The active rotation assembly (3) includes a lead screw structure and a clamping power box (3-1); the active rotation assembly (3) is mounted on the square tube assembly (6) via an active rotation assembly mounting base (3-5); The lead screw structure includes an adjusting lead screw (3-15) and a chuck moving cylinder (3-16); one end of the adjusting lead screw (3-15) extends out of the lead screw structure mounting box (3-20) and is connected to a handwheel (3-8), and the other end is connected to the chuck moving cylinder (3-16) and mounted on the lead screw fixing seat (3-17). The lead screw fixing seat (3-17) is connected to an adjusting slider (3-18), and the adjusting slider (3-18) can move along the adjusting slider guide rail (3-21). The adjusting slider guide rail (3-21) is mounted on the bottom of the lead screw structure mounting box (3-20); the chuck moving cylinder (3-16) is mounted on the chuck moving cylinder fixing seat (3-19). The power spindle (3-2) is installed inside the clamping power box (3-1), and one end of the power spindle (3-2) is connected to the pneumatic three-jaw chuck (3-3); the power spindle (3-2) is driven by a motor drive system. A power box support plate (3-7) is installed on the top surface of the lead screw structure mounting box (3-20) of the power box (3-1). The two sides of the power box support plate (3-7) serve as guide rails, and the long slider (3-4) can move along the guide rails. The power box (3-1) is mounted on the long slider (3-4).

6. The automatic welding equipment for bridge housing accessories according to claim 5, characterized in that: The motor drive system that drives the power spindle (3-2) in the active rotary assembly (3) includes a motor (3-6), a worm gear (3-10), a worm (3-14), and a coupling (3-13); The worm gear (3-10) is mounted on the power spindle (3-2). The worm gear (3-10) meshes with the transmission worm (3-14). The transmission worm (3-14) is connected to the coupling (3-13). The coupling (3-13) is connected to the motor (3-6). The motor (3-6) drives the pneumatic three-jaw chuck (3-3) through the worm gear transmission mechanism.

7. The bridge assembly automatic welding apparatus of claim 6, wherein: The structure and function of the components of the driven rotating assembly (7) are the same as those of the other components of the active rotating assembly (3), except for the motor drive system of the active rotating assembly (3).

8. The bridge assembly automatic welding apparatus of claim 7, wherein: The robot mounting base plate (2-4) has multiple interfaces, which facilitates the adjustment of the installation distance of the welding robot (1).

9. The bridge assembly automatic welding apparatus of claim 8, wherein: All square tubes of the square tube assembly (6) are hollow seamless square tubes with a specification of 160×80×6.

10. The bridge assembly automatic welding apparatus of claim 9, wherein: In the active rotating assembly (3), a spacer (12) is provided on the power spindle (3-2) section between the worm gear (3-10) and the power spindle bearing (3-11); a power spindle cover (3-9) is provided on the power spindle (3-2) extending out of the tail of the power box (3-1).

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