Automobile bridge piece welding device

Abstract

The utility model discloses a kind of automobile bridge piece welding devices, belong to bridge piece welding technical field, including rack, supporting mechanism, clamping mechanism and welding mechanism, the both ends of the rack symmetry are equipped with supporting mechanism, clamping mechanism is also fixed on the upper end surface of rack, and welding mechanism is installed on the side of rack;Welding mechanism includes first linear slide, second linear slide and reciprocating swing assembly, first linear slide is installed on side support, the slider of first linear slide is fixedly connected with one end of second linear slide, the slider of second linear slide is connected with reciprocating swing assembly, and welding torch is installed on reciprocating swing assembly. Compared with prior art, it has the characteristics of facilitating clamping and welding bridge piece.

Description

Technical Field

[0001] This utility model relates to the field of bridge axle welding technology, and in particular to an automotive bridge axle welding device. Background Technology

[0002] As a core load-bearing component of key assemblies such as automotive drive axles and steering axles, automotive axle housings not only transmit vehicle driving torque and braking torque, but also bear the weight of the vehicle body and complex impact loads during driving. The strength, sealing performance, and dimensional accuracy of its welded joints are directly related to the safety and long-term reliability of the entire vehicle.

[0003] Most current automotive axle housings employ a two-piece stamped axle plate welded structure. The straight weld formed by the butt joint of the two plates is the weakest point in the overall axle housing's mechanical structure and a core element for welding quality control. However, current production processes for this type of straight weld still largely rely on manual positioning, alignment, and welding. This method not only requires operators to repeatedly calibrate the relative positions of the axle plates, which is time-consuming, labor-intensive, and inefficient, but also, due to the subjectivity and instability of manual operation, it is difficult to ensure the uniformity of the weld gap. This easily leads to defects such as undercut, lack of fusion, and inconsistent weld formation, seriously affecting the overall load-bearing performance and service life of the axle housing. Summary of the Invention

[0004] The purpose of this utility model is to address the shortcomings of the existing technology by providing an automotive axle welding device that facilitates the clamping and welding of axle segments.

[0005] The present invention provides an automotive axle welding device, comprising a frame, a support mechanism, a clamping mechanism, and a welding mechanism. The support mechanisms are symmetrically installed at both ends of the frame, and a clamping mechanism is fixed on the upper surface of the frame. A welding mechanism is installed on one side of the frame. The welding mechanism includes a first linear slide, a second linear slide, and a reciprocating swing assembly. The first linear slide is installed on the side support, and the slider of the first linear slide is fixedly connected to one end of the second linear slide. The slider of the second linear slide is connected to the reciprocating swing assembly.

[0006] Furthermore, the support mechanism includes a support plate, a support base, a first telescopic rod, and a second telescopic rod. The bottom of the support base is slidably engaged with the upper end of the frame, the upper end of the support base is vertically slidably engaged with the support plate, and the lower ends of the support base and the support plate are slidably engaged through the first telescopic rod. The upper end of the support plate is provided with a V-shaped clamping groove, and the frame is connected to the support base through the second telescopic rod.

[0007] Furthermore, the support base is fixedly installed with first sliders at both ends, and the upper surface of the frame is provided with a long strip-shaped slide that is adapted to the first slider. The first slider is placed in the slide of the frame, and the two slide in cooperation.

[0008] Furthermore, a second slider is installed on the support base along the height direction, and a vertical slide rail adapted to the second slider is provided on the support plate. The second slider is placed in the slide rail of the support plate, and the two slide together to form a vertical sliding pair.

[0009] Furthermore, the clamping mechanism includes lifting rods, a first clamp, and a second clamp. Three sets of lifting rods are evenly fixed along the length of the upper end face of the frame. Each set of lifting rods includes two symmetrically distributed lifting rods. A horizontally arranged guide sleeve is fixedly installed at the upper end of all lifting rods. A through horizontal guide hole is opened inside the guide sleeve. A square guide rod is fixedly connected to one side of both the first clamp and the second clamp. The outer diameter of the guide rod is adapted to the through hole of the guide sleeve. The guide rod of the first clamp is inserted into the through hole of the guide sleeve of the middle set of lifting rods, and the guide rod of the second clamp is inserted into the through holes of the guide sleeves of the two end sets of lifting rods, forming a sliding fit pair. One end of the guide sleeve is connected to a third telescopic rod, and the inner rod of the third telescopic rod is connected to the guide rod of the first clamp or the second clamp.

[0010] Furthermore, the lifting rod includes a lifting outer cylinder, a lifting inner rod, and a fourth telescopic rod. The lifting outer cylinder is provided with a guide hole, and the lifting inner rod is inserted into the guide through hole of the lifting outer cylinder. The two are slidably engaged, and the lifting outer cylinder is connected to the lifting inner rod through the fourth telescopic rod.

[0011] Furthermore, the first clamp and the second clamp are respectively provided with V-shaped clamping grooves on the end facing the bridge piece, and the inner wall of the clamping groove is polished and a wear-resistant and anti-slip pad is attached.

[0012] Furthermore, the reciprocating oscillating assembly includes a fixed seat, a sliding plate, a transmission screw, and a screw nut. The fixed seat has a sliding groove, and the side wall of the fixed seat has two inverted V-shaped guide holes. The sliding plate has two guide pins, which pass through the corresponding V-shaped guide holes and are fixedly connected to the guide block. The guide block is placed in the sliding groove of the fixed seat, and the two are in sliding fit. The two end walls of the sliding groove of the fixed seat have through holes. The transmission screw is horizontally installed in the sliding groove, with one end forming a rotational fit with the through hole at one end of the sliding groove, and the other end passing through the through hole at the other end of the sliding groove and connected to the output shaft of the motor. The guide block has an elongated through hole along the height direction. The two ends of the screw nut are connected to the guide plate, and the screw nut and the transmission screw are in fit. The two guide plates are symmetrically arranged and fit against the side wall of the sliding groove of the fixed seat. Their shape is adapted to the inner wall of the sliding groove to form a sliding fit pair.

[0013] Furthermore, a fixed clamping block is fixedly installed at the lower end of the sliding plate. The fixed clamping block and the movable clamping block are detachably connected by bolts. The opposite sides of the fixed clamping block and the movable clamping block are provided with V-shaped clamping grooves. The two ends of the V-shaped clamping grooves of the fixed clamping block and the movable clamping block are symmetrically provided with coaxial threaded through holes. During assembly, the welding torch is placed between the two clamping grooves, and then the fastening bolts are passed through the threaded through holes of the movable clamping block and the fixed clamping block in sequence and tightened. The welding torch can be firmly fixed by the enclosing force of the two clamping grooves.

[0014] Compared with the prior art, the present invention has the following outstanding advantages: 1. The clamping mechanism of this utility model adopts a partitioned positioning mode of "central main clamp + two auxiliary clamps". Three sets of liftable support units provide a stable foundation for the clamp. The lifting rod driven by the fourth telescopic rod can accurately adjust the height of the clamp to ensure that the V-shaped clamping groove fits the surface of the bridge piece. The wear-resistant and anti-slip pads pasted on the inner wall of the clamping groove not only achieve tight clamping by adapting the V-shaped structure to the arc contour of the bridge piece, but also avoid pressure or scratches on the surface of the bridge piece caused by the clamping force. This partitioned clamping design can effectively constrain the thermal deformation and vibration displacement of the bridge piece during the welding process, ensuring that the butt joint always maintains straightness, laying a solid foundation for the subsequent welding quality. 2. This utility model, through the structural design of "inverted V-shaped guide through hole + screw drive", transforms the horizontal reciprocating motion of the screw nut into the "swing + lifting" composite motion of the sliding plate. The welding torch is initially aligned with the center line of the weld. During the swing to both sides, it sinks slightly along the inverted V-shaped through hole, which accurately compensates for the height difference of the arc transition edge of the bridge plate. This keeps the vertical distance between the welding torch nozzle and the surface of the bridge plate stable, completely solving the problem of uneven heat input on both sides of the weld caused by the traditional horizontal swing welding torch. It effectively avoids welding defects such as incomplete fusion and inconsistent penetration depth, and significantly improves the weld formation quality and mechanical properties. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is the front view of this utility model; Figure 3 This is a top view of the present invention; Figure 4 This is a structural schematic diagram of the support mechanism of this utility model; Figure 5 This is a schematic diagram of the reciprocating oscillating assembly of this utility model; Figure 6 This is a top view of the reciprocating oscillating assembly of this utility model; Figure 7 This is a schematic diagram of the internal structure of the reciprocating oscillating assembly of this utility model; Figure 8This is a structural schematic diagram of the fixing base part of this utility model; Figure 9 This is a structural schematic diagram of the guide block portion of this utility model; In the diagram, 1. Frame; 2. Support mechanism; 21. Support base; 22. Support plate; 3. Clamping mechanism; 31. Lifting rod; 32. Guide sleeve; 33. First clamp; 34. Guide rod; 35. Second clamp; 4. Welding mechanism; 41. First linear slide; 42. Second linear slide; 43. Reciprocating oscillating assembly; 431. Fixed base; 432. Sliding plate; 433. Transmission screw; 434. Guide plate; 435. Screw nut; 436. Guide block; 437. Guide pin; 438. Fixed clamping block; 439. Movable clamping block; 5. Welding torch. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] like Figures 1-3 As shown, this utility model includes a frame 1, a support mechanism 2, a clamping mechanism 3, and a welding mechanism 4.

[0018] The frame 1 is symmetrically equipped with support mechanisms 2 at both ends to support the ends of the bridge pieces and adjust their height. Within the distance between the two support mechanisms 2, a clamping mechanism 3 for positioning the bridge pieces is also fixed on the upper surface of the frame 1 to ensure the stability of the bridge pieces during the welding process. Meanwhile, a welding mechanism 4 is installed on one side of the frame 1.

[0019] like Figure 4 As shown, the support mechanism 2 includes a support plate 22, a support base 21, a first telescopic rod, and a second telescopic rod. The bottom of the support base 21 is slidably engaged with the upper end surface of the frame 1, allowing it to move horizontally along the length of the frame 1. The upper end of the support base 21 is vertically slidably engaged with the support plate 22. The lower ends of the support base 21 and the support plate 22 are slidably engaged through the first telescopic rod to achieve height adjustment. The upper end of the support plate 22 is provided with a V-shaped groove for stabilizing the end of the bridge piece. The frame 1 is connected to the support base 21 through the second telescopic rod, providing power for the horizontal sliding of the support base 21.

[0020] In the optimized solution, the support base 21 is fixedly installed with first sliders at both ends, and the upper surface of the frame 1 is provided with a long strip slide that is adapted to the first slider. The slide extends along the length of the frame 1, and the first slider is placed in the slide of the frame 1. The two slide together. When the second telescopic rod extends or retracts, it can drive the support base 21 to move along the slide, thereby realizing the adjustment of the bridge plate support height.

[0021] The support base 21 is equipped with a second slider distributed along the height direction. The support plate 22 is provided with a vertical slide rail adapted to the second slider. The second slider is placed in the slide rail of the support plate 22. The two slide together to form a vertical sliding pair. When the first telescopic rod extends or retracts, it can drive the support plate 22 to move up and down along the second slider.

[0022] The clamping mechanism 3 includes lifting rods 31, a first clamp 33, and a second clamp 35. Three sets of lifting rods 31 are evenly fixed along the length of the upper end face of the frame 1. Each set of lifting rods 31 includes two symmetrically distributed lifting rods 31, forming a stable support unit. A horizontally arranged guide sleeve 32 is fixedly installed at the upper end of all lifting rods 31. A through horizontal guide hole is opened inside the guide sleeve 32. A square guide rod 34 is fixedly connected to one side of the first clamp 33 and the second clamp 35. The outer diameter of the guide rod 34 is adapted to the through hole of the guide sleeve 32. The guide rod 34 of the first clamp 33 is inserted into the through hole of the guide sleeve 32 of the middle set of lifting rods 31, and the guide rod 34 of the second clamp 35 is inserted into the through holes of the guide sleeve 32 of the two end sets of lifting rods 31. They all form a sliding fit pair to provide guidance for the horizontal movement of the clamps.

[0023] One end of the guide sleeve 32 is fixedly connected to the third telescopic rod, and the inner rod of the third telescopic rod is fixedly connected to the guide rod 34 of the first clamp 33 or the second clamp 35.

[0024] The lifting rod 31 includes a lifting outer cylinder, a lifting inner rod, and a fourth telescopic rod. The lifting outer cylinder is provided with a guide hole, and the lifting inner rod is inserted into the guide through hole of the lifting outer cylinder. The two are slidably engaged. The lifting outer cylinder is connected to the lifting inner rod through the fourth telescopic rod. Through the extension and retraction of the fourth telescopic rod, the lifting inner rod can be directly driven to make a linear lifting and lowering motion along the guide through hole of the outer cylinder.

[0025] The first clamp 33 and the second clamp 35 are respectively provided with V-shaped clamping grooves on the end facing the bridge piece. The inner wall of the clamping groove is polished and a wear-resistant and anti-slip pad is attached, which not only adapts to the arc contour of the bridge piece, but also avoids damage to the surface of the workpiece during clamping. The V-shaped clamping groove of the first clamp 33 corresponds precisely to the outer periphery contour of the middle part of the bridge shell, while the V-shaped clamping groove of the second clamp 35 matches the shape of the two ends of the bridge shell. The bridge piece is stably clamped as a whole through partitioned positioning.

[0026] In the optimized solution, rotating shafts are correspondingly provided on the two opposing inner walls of the V-shaped clamping groove of the first clamp 33. Each rotating shaft is rotatably engaged with a positioning wheel, and part of the positioning wheel protrudes from the inner wall of the V-shaped clamping groove.

[0027] A side bracket is fixedly installed on one side of the frame 1, and a welding mechanism 4 is installed on the side bracket. The welding mechanism 4 includes a first linear slide 41, a second linear slide 42, and a reciprocating swing assembly 43. The first linear slide 41 is installed on the side bracket, and the slider of the first linear slide 41 is fixedly connected to one end of the second linear slide 42. The slider of the second linear slide 42 is fixedly connected to the reciprocating swing assembly 43.

[0028] The first linear slide 41 and the second linear slide 42 are existing technologies, and their specific structures will not be described in detail.

[0029] like Figures 5-8 As shown, the reciprocating oscillating assembly 43 includes a fixed base 431, a sliding plate 432, a transmission screw 433, and a screw nut 435. The fixed base 431 is provided with a sliding groove, and the side wall of the fixed base 431 is provided with two inverted V-shaped guide through holes. The special contour of these through holes is the key to achieving height self-adaptation of the welding torch 5. Its highest point corresponds to the weld centerline, and its two sides extend obliquely to adapt to the height change of the arc edge of the bridge plate. The sliding plate 432 is provided with two guide pins 437, and the two guide pins 437 pass through the corresponding V-shaped guides. The guide block 436 is fixedly connected to the through hole and placed in the groove of the fixed seat 431. The two slide in a sliding fit. The two end walls of the groove of the fixed seat 431 are provided with through holes. The transmission screw 433 is horizontally installed in the groove. One end of the screw is rotated with the through hole at one end of the groove through a deep groove ball bearing. The other end passes through the through hole at the other end of the groove and is rigidly connected to the output shaft of the motor through a flexible coupling. The motor is fixed to the fixed seat 431 by bolts through the motor base to ensure no radial offset during transmission.

[0030] like Figure 9 As shown, the guide block 436 has an elongated through hole along its height direction. The lead screw nut 435 is embedded in the elongated through hole to form a slightly movable fit. The two ends of the lead screw nut 435 are respectively connected to the guide plate 434. The lead screw nut 435 cooperates with the transmission lead screw 433. The two guide plates 434 are symmetrically arranged and fit against the side wall of the slide groove of the fixed seat 431. Their shape is adapted to the inner wall of the slide groove to form a sliding fit pair. Through the limiting effect of the guide plate 434, the lead screw nut 435 is prevented from rotating with the transmission lead screw 433, and the guide block 436 is assisted to slide smoothly along the slide groove. Finally, the threaded engagement transmission between the lead screw nut 435 and the transmission lead screw 433 is converted into the horizontal reciprocating motion of the guide block 436.

[0031] A fixed clamping block 438 is fixedly installed at the lower end of the sliding plate 432. The fixed clamping block 438 and the movable clamping block 439 are detachably connected by bolts. Both the fixed clamping block 438 and the movable clamping block 439 have V-shaped clamping grooves on their opposite sides. The inner walls of the clamping grooves are pasted with high-temperature resistant and anti-slip silicone pads, which can accommodate welding torches 5 of different diameters and prevent welding vibration from causing the welding torch 5 to shift. To ensure locking reliability, both ends of the V-shaped clamping grooves of the fixed clamping block 438 and the movable clamping block 439 are symmetrically provided with coaxial threaded through holes. During assembly, the welding torch 5 is placed between the two clamping grooves, and then the fastening bolts are passed through the threaded through holes of the movable clamping block 439 and the fixed clamping block 438 in sequence and tightened. The welding torch 5 can be firmly fixed by the enclosing force of the two clamping grooves.

[0032] When the reciprocating oscillating assembly 43 is in its initial state, the guide pin 437 on the sliding plate 432 is exactly at the highest point of the inverted V-shaped guide through hole of the fixed seat 431. At this time, the welding torch 5, which is fixed to the sliding plate 432, can accurately align its nozzle with the center line of the weld seam of the two bridge plates. When the motor is started and controlled to perform reciprocating forward and reverse motion, the output shaft of the motor drives the transmission screw 433 to rotate synchronously through the coupling. The transmission screw 433 then drives the screw nut 435 to perform horizontal reciprocating motion along the slide groove of the fixed seat 431 through thread engagement. The screw nut 435 drives the guide block 436 to move synchronously with it through the guide plates 434 at both ends. The guide block 436 is connected to the sliding plate 432 through the guide pin 437. Under the sliding fit constraint of the guide pin 437 and the inverted V-shaped guide through hole, the horizontal motion of the screw nut 435 is converted into the tilting and lifting composite motion of the sliding plate 432, thereby driving the welding torch 5 to achieve the linkage action of "horizontal reciprocating oscillation + follow-up lifting".

[0033] Because the mating edges of the two bridge plates have a rounded transition structure (this design aims to meet the assembly requirements of the entire vehicle and disperse stress concentration during driving), the surfaces of the bridge plates on both sides of the weld centerline extend outward in an arc shape, resulting in a difference in the height of the workpiece surface along the swing path of the welding torch 5. When the welding torch 5 moves along the inverted V-shaped guide hole with the sliding plate 432, it will sink slightly downwards simultaneously during the swing towards both sides of the weld, which can effectively compensate for the height difference of the rounded surfaces of the bridge plates, greatly reduce the fluctuation of the vertical distance from the nozzle of the welding torch 5 to the surface of the bridge plates, and provide uniform heat input to both sides of the weld.

[0034] The operation process is as follows: The specific steps for using this utility model are as follows: First, the initial positioning of the bridge piece is completed. According to the length specification of the bridge piece to be welded, the distance between the two support mechanisms 2 is adjusted in advance. Then, the mating ends of the two bridge pieces are placed in the V-shaped groove of the support plate 22. The precise alignment of the bridge piece ends is achieved by the self-centering characteristic of the V-shaped structure. After initial positioning, the bridge segments are clamped and fixed. First, the fourth telescopic rod of the clamping mechanism 3 is activated, and the height of the lifting rod 31 is adjusted so that the clamp is flush with the surface of the bridge segment. Then, the first clamp 33 is driven to move towards the middle part of the bridge segment through the third telescopic rod until its V-shaped clamping groove fits the outer periphery of the bridge segment. At the same time, the second clamps 35 at both ends are driven to clamp the end area of ​​the bridge segment. Through the partitioned clamping mode of "middle main clamp + two auxiliary clamps", the straightness and stability of the bridge segment joint are ensured. After clamping, the position of the welding torch 5 is calibrated. Through the coordinated adjustment of the first linear slide 41 (along the length of the frame 1) and the second linear slide 42 (along the direction perpendicular to the frame 1), the reciprocating swing assembly 43 and the welding torch 5 are moved so that the nozzle of the welding torch 5 is accurately aligned with the weld center line of the two bridge plates. At this time, the guide pin 437 of the reciprocating swing assembly 43 is at the highest point of the inverted V-shaped through hole. After calibration, the welding operation is started. The welding torch 5 and the first linear slide 41 are turned on simultaneously, so that the first linear slide 41 drives the welding torch 5 to feed at a constant speed along the length of the weld. During this process, the motor of the reciprocating swing assembly 43 is started, and the welding torch 5 is driven to perform "reciprocating swing + adaptive lifting" motion along the inverted V-shaped guide through hole through the transmission screw 433 to ensure that the weld is heated evenly on both sides and complete the automated welding of the entire straight weld.

[0035] It should be noted that the specific embodiments of this utility model have been described in detail. For those skilled in the art, all obvious changes made to it without departing from the spirit and scope of this utility model are within the protection scope of this utility model.

Claims

1. A welding device for automotive axle segments, characterized in that: The assembly includes a frame (1), a support mechanism (2), a clamping mechanism (3), and a welding mechanism (4). The support mechanism (2) is symmetrically installed at both ends of the frame (1), and the clamping mechanism (3) is fixed on the upper surface of the frame (1). The welding mechanism (4) is installed on one side of the frame (1). The welding mechanism (4) includes a first linear slide (41), a second linear slide (42), and a reciprocating swing assembly (43). The first linear slide (41) is installed on the side support. The slider of the first linear slide (41) is fixedly connected to one end of the second linear slide (42). The slider of the second linear slide (42) is connected to the reciprocating swing assembly (43). A welding torch (5) is installed on the reciprocating swing assembly (43).

2. The automotive axle welding device according to claim 1, characterized in that: The support mechanism (2) includes a support plate (22), a support seat (21), a first telescopic rod and a second telescopic rod. The bottom of the support seat (21) is slidably engaged with the upper end of the frame (1). The upper end of the support seat (21) is vertically slidably engaged with the support plate (22). The lower end of the support seat (21) and the support plate (22) are slidably engaged through the first telescopic rod. The upper end of the support plate (22) is provided with a V-shaped clamping groove. The frame (1) is connected to the support seat (21) through the second telescopic rod.

3. The automotive axle welding apparatus according to claim 2, characterized in that: The support base (21) is fixedly installed with a first slider at both ends. The upper surface of the frame (1) is provided with a long strip slide that is adapted to the first slider. The first slider is placed in the slide of the frame (1) and the two slide together.

4. The automotive axle welding apparatus according to claim 2, characterized in that: The support base (21) is equipped with a second slider distributed along the height direction. The support plate (22) is provided with a vertical slide rail adapted to the second slider. The second slider is placed in the slide rail of the support plate (22). The two slide together to form a vertical sliding pair.

5. The automotive axle welding apparatus according to claim 1, characterized in that: The clamping mechanism (3) includes lifting rods (31), a first clamp (33), and a second clamp (35). Three sets of lifting rods (31) are evenly fixed along the length of the upper end face of the frame (1). Each set of lifting rods (31) includes two symmetrically distributed lifting rods (31). A horizontally arranged guide sleeve (32) is fixedly installed at the upper end of all lifting rods (31). A through horizontal guide hole is opened inside the guide sleeve (32). A square guide rod (34) is fixedly connected to one side of both the first clamp (33) and the second clamp (35). The outer diameter of the guide rod (34) is adapted to the through hole of the guide sleeve (32); wherein, the guide rod (34) of the first clamp (33) is correspondingly inserted into the through hole of the guide sleeve (32) of the middle lifting rod (31), and the guide rod (34) of the second clamp (35) is correspondingly inserted into the through hole of the guide sleeve (32) of the two end lifting rods (31), both forming a sliding fit pair; one end of the guide sleeve (32) is connected to the third telescopic rod, and the inner rod of the third telescopic rod is connected to the guide rod (34) of the first clamp (33) or the second clamp (35).

6. The automotive axle welding apparatus according to claim 5, characterized in that: The lifting rod (31) includes a lifting outer cylinder, a lifting inner rod and a fourth telescopic rod. The lifting outer cylinder is provided with a guide hole, and the lifting inner rod is inserted into the guide through hole of the lifting outer cylinder. The two are slidably engaged, and the lifting outer cylinder is connected to the lifting inner rod through the fourth telescopic rod.

7. The automotive axle welding apparatus according to claim 5, characterized in that: The first clamp (33) and the second clamp (35) are respectively provided with V-shaped clamping grooves on the end facing the bridge piece. The inner wall of the clamping groove is polished and a wear-resistant and anti-slip pad is attached.

8. The automotive axle welding apparatus according to claim 1, characterized in that: The reciprocating oscillating assembly (43) includes a fixed seat (431), a sliding plate (432), a transmission screw (433), and a screw nut (435). The fixed seat (431) is provided with a sliding groove, and the side wall of the fixed seat (431) is provided with two inverted V-shaped guide holes. The sliding plate (432) is provided with two guide pins (437). The two guide pins (437) pass through the corresponding V-shaped guide holes and are fixedly connected to the guide block (436). The guide block (436) is placed in the sliding groove of the fixed seat (431), and the two slide in cooperation. The two sides of the sliding groove of the fixed seat (431) are connected in a sliding manner. The end wall is provided with a through hole, and the transmission screw (433) is horizontally installed in the slide groove. One end of the screw is rotated with the through hole at one end of the slide groove, and the other end passes through the through hole at the other end of the slide groove and is connected to the output shaft of the motor. The guide block (436) is provided with a long strip-shaped through hole along the height direction. The two ends of the screw nut (435) are respectively connected to the guide plate (434). The screw nut (435) cooperates with the transmission screw (433). The two guide plates (434) are symmetrically arranged and fit against the side wall of the slide groove of the fixed seat (431). Their shape is adapted to the inner wall of the slide groove to form a sliding fit pair.

9. The automotive axle welding apparatus according to claim 8, characterized in that: The lower end of the sliding plate (432) is fixedly installed with a fixed clamping block (438). The fixed clamping block (438) and the movable clamping block (439) are detachably connected by bolts. The opposite sides of the fixed clamping block (438) and the movable clamping block (439) are provided with V-shaped clamping grooves. The two ends of the V-shaped clamping grooves of the fixed clamping block (438) and the movable clamping block (439) are symmetrically provided with coaxial threaded through holes. During assembly, the welding gun (5) is placed between the two clamping grooves, and then the fastening bolts are passed through the threaded through holes of the movable clamping block (439) and the fixed clamping block (438) in sequence and tightened. The welding gun (5) can be fixed by the enclosing force of the two clamping grooves.

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