Buffer seat, buffer seat support assembly, shock absorber support assembly and rear axle housing assembly splicing and welding clamp and using method of buffer seat, buffer seat support assembly, shock absorber support assembly and rear axle housing assembly splicing and welding clamp

Abstract

The invention relates to the technical field of automobile welding fixtures, and particularly discloses a buffer seat, a buffer seat bracket assembly, a shock absorber bracket assembly and rear axle housing assembly splicing and welding fixture and a use method thereof. The assembling and welding clamp comprises a tool platform, a center positioning mechanism assembly, a head and tail seat assembly, a buffer seat positioning device, a buffer seat support assembly positioning device and a shock absorber support assembly positioning device. The center positioning mechanism assembly is fixed on the tool platform; the head and tail seat assembly, the buffer seat positioning device and the buffer seat bracket assembly positioning device are respectively arranged on a first guide rail of the tool platform; the shock absorber support assembly positioning device is installed on the second guide rail of the tool platform. The clamp is easy to operate and stable in effect, the size precision and stability of assembling and welding of the buffer seat, the buffer seat support assembly, the shock absorber support assembly and the rear axle housing assembly are guaranteed, the product quality is guaranteed, the machining efficiency is greatly improved, and the labor intensity of workers is relieved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile welding fixtures, and in particular to an assembling welding fixture for a buffer seat, a buffer seat bracket assembly, a shock absorber bracket assembly and a rear axle housing assembly. Background Art

[0002] The various brackets on the SUV's rear drive axle are important connecting components that support the rear drive axle and the frame to bear weight or balance the frame's stability and safety. Their assembly size directly affects the various performances of the vehicle.

[0003] The bracket on the rear axle of SUV drive mainly consists of coil spring seat, stabilizer bar bracket assembly, oil pipe bracket assembly, secondary push rod bracket assembly, buffer seat, buffer seat bracket assembly, shock absorber bracket assembly, and side push rod bracket assembly. The installation size of the relevant bracket assembly directly affects the overall performance of the car. With the advancement of technology and market demand, different products require different welding fixtures, and the demand for welding tooling in the market is growing. People are also increasingly demanding the accuracy, safety, and reliability of welding fixtures. The punch seat, buffer seat bracket assembly, shock absorber bracket assembly, and rear axle housing assembly assembly welding fixtures that can meet the above requirements are in urgent need of appearance. Summary of the invention

[0004] The purpose of the present invention is to solve the defects of the prior art and to provide a welding fixture for assembling a buffer seat, a buffer seat bracket assembly, a shock absorber bracket assembly and a rear axle housing assembly.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A buffer seat, a buffer seat bracket assembly, a shock absorber bracket assembly and a rear axle housing assembly assembly welding fixture, including a tooling platform, a center positioning mechanism assembly, a head and tail seat assembly, a buffer seat positioning device, a buffer seat bracket assembly positioning device, and a shock absorber bracket assembly positioning device; Among them, the center positioning mechanism assembly is fixed on the tooling platform; the head and tail seat assembly, the buffer seat positioning device, and the buffer seat bracket assembly positioning device are respectively installed on the first guide rail of the tooling platform; The shock absorber bracket assembly positioning device is installed on the second guide rail of the tooling platform.

[0006] Further, the tooling platform includes a base frame, a base plate, a first guide rail, a manual valve mounting support, a manual valve, a second guide rail, and a positioning pin; The base frame is welded with angle steel, the bottom plate is welded on the base frame, and the first guide rail and the second guide rail are fixedly connected to the base frame by screws and positioning pins; The manual valve mounting support is welded on the bottom plate, and the manual valve is fixedly connected to the manual valve mounting support by screws.

[0007] Further, the center positioning mechanism assembly includes a center base, a cylinder, a connecting flange, a connecting nut, a connecting body, a center seat, a connecting sleeve, a first flat key, a second flat key, a guide rod, a spring, a spring adjuster, a supporting plate, a cushion block, a sliding shaft, a limiting cone sleeve, a limiting nut, a limiting plate, a limiting rod, and a third flat key; The cylinder is fixedly connected to the connecting flange by screws, and the connecting body is connected to the extended shaft of the cylinder by its own internal thread; The coupling nut is sleeved on the inner side of the extending shaft of the coupling body and the cylinder and connected to the guide rod; One end of the connecting sleeve is connected to the coupling body, the second flat key is fixedly connected to the keyway of the guide rod, the guide rod is connected to the center seat through the second flat key, and the connecting flange is fixedly connected to the center seat; The support plate is fixedly connected to the guide rod, and the cushion block is fixedly connected to the support plate by screws; The first flat key is fixedly connected to the keyway of the sliding shaft, the spring adjuster is connected to the inner cavity of the sliding shaft, the limit nut is connected to the sliding shaft through a thread, the other end of the connecting sleeve is installed together with the spring in the inner cavity of the guide rod and the sliding shaft, the sliding shaft is connected to the inner cavity of the guide rod through the first flat key, and the limit plate is connected to the supporting plate; The limiting cone sleeve is fixedly connected to the sliding shaft; the limiting rod is connected in series with the supporting plate in the two holes of the center seat; The third flat key is connected to the center seat, and the center seat is connected to the center base through the third flat key and screws.

[0008] Further, the head and tail seat assembly includes a cylinder, a front flange, a locking nut, a guide bolt, a cylinder nut, a head and tail seat, a guide shaft, a positioning core, a support plate, and a V-shaped bracket; Among them, the cylinder is fixedly connected to the front flange, the cylinder is connected to the guide shaft through the locking nut and the cylinder nut, the guide shaft is connected to the head and tail seats through clearance fit, the front flange is fixedly connected to the head and tail seats, the guide bolts are fixedly connected to the head and tail seats, the positioning core is fixedly connected to the guide shaft, the support plate is fixedly connected to the head and tail seats, and the V-shaped bracket is fixedly connected to the head and tail seats.

[0009] Furthermore, the buffer seat positioning device includes a support, a first thin cylinder, a first limiting bolt, a first slider, a positioning plate, a positioning pin, a baffle, a positioning seat, a positioning rod, a spring, and a nut; Among them, the first thin cylinder is fixedly connected to the support, the slider is connected to the extended shaft of the first thin cylinder, the first limit bolt is connected to the support, the first limit bolt is engaged in the groove of the first slider, the first slider is connected to the inner cavity of the support through clearance fit, the positioning plate is positioned by the slot and fixedly connected to the first slider by screws, the positioning pin is connected to the positioning plate by interference fit, the positioning seat is positioned by the slot and fixedly connected to the positioning plate by screws, the positioning rod is installed in the hole of the positioning seat, the spring is sleeved on the positioning rod, the baffle is connected to the positioning plate through the positioning rod, and the positioning rod is threadedly connected to the positioning seat with a nut.

[0010] Further, the buffer seat bracket assembly positioning device includes a support, a second thin cylinder, a second limit bolt, a slider, a positioning plate, a positioning pin, and a U-shaped positioning block; Among them, the second thin cylinder is fixedly connected to the support by screws, the second slider is connected to the protruding shaft of the second thin cylinder by screws, the second limiting bolt is connected to the support, the second limiting bolt is clamped in the groove of the second slider, the second slider is connected to the inner cavity of the support by clearance fit, the positioning plate is positioned by the slot and fixedly connected to the second slider by screws, the positioning pin is connected to the positioning plate by interference fit, and the U-shaped positioning block is positioned by the slot and fixedly connected to the positioning plate by screws.

[0011] Further, the shock absorber bracket assembly positioning device includes a base, a guide rail groove, a third guide rail, a positioning core, a handle, a pressure plate, a cushion block, a quick clamp, a V-shaped positioning block, and a height adjustment gasket; The positioning core and the handle are fixedly connected to the third guide rail, the guide rail groove is positioned and connected to the base through the card slot, the third guide rail is positioned and connected to the guide rail groove through the card slot, the pressure plate and the guide rail groove are fixedly connected to the base, the quick clamp and the cushion block are fixedly connected to the base, and the V-shaped positioning block and the height adjustment gasket are fixedly connected to the base.

[0012] The beneficial effects of the present invention are as follows: the clamp is easy to operate and has a stable effect, and it ensures the dimensional accuracy and stability of the assembly and welding of the buffer seat, the buffer seat bracket assembly, the shock absorber bracket assembly and the rear axle housing assembly, thereby ensuring product quality, greatly improving processing efficiency and reducing the labor intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a general schematic diagram in an embodiment of the present invention; Figure 1a for Figure 1 Schematic diagram of the cross section along line AA; Figure 1b for Figure 1 Schematic diagram of the cross section along line BB; Figure 1c for Figure 1 A schematic cross-sectional view along line CC; Figure 2 A schematic diagram of the structure of the tooling platform in an embodiment of the present invention; Figure 2a It is a side schematic diagram of the tooling platform structure in an embodiment of the present invention; Figure 2b A schematic top view of a tooling platform structure in an embodiment of the present invention; Figure 3 A schematic diagram of the center positioning mechanism assembly structure in an embodiment of the present invention; Figure 4 A schematic diagram of the structure of the head and tail seat assembly in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the buffer seat positioning device in an embodiment of the present invention; Figure 5a It is a side schematic diagram of the buffer seat positioning device in an embodiment of the present invention; Figure 5b A schematic top view of a buffer seat positioning device in an embodiment of the present invention; Figure 6 A schematic diagram of the structure of the positioning device of the buffer seat bracket assembly in an embodiment of the present invention; Figure 6a It is a side schematic diagram of a positioning device for a buffer seat bracket assembly in an embodiment of the present invention; Figure 7 It is a structural schematic diagram of a shock absorber bracket assembly positioning device in an embodiment of the present invention; Figure 7a A side schematic diagram of a shock absorber bracket assembly positioning device in an embodiment of the present invention; Figure 8 A schematic diagram of the structure of a workpiece in an embodiment of the present invention; Figure 8a is a schematic top view of a workpiece in an embodiment of the present invention; Fig. 9 for Figure 8a Schematic diagram of the cross section along the DD direction; Fig.10 for Figure 8a Schematic diagram of the cross section along the EE direction.

[0014] Description of the accompanying drawings: tooling platform 1, center positioning mechanism assembly 2, head and tail seat assembly 3, buffer seat positioning device 4, buffer seat bracket assembly positioning device 5, shock absorber bracket assembly positioning device 6, T-nut 7, flat key 8, chassis 9, bottom plate 10, first guide rail 11, manual valve mounting support 12, manual valve 13, second guide rail 14, positioning pin 15, center base 16, cylinder 17, connecting flange 18, connecting nut 19, connecting body 20, center seat 21, connecting sleeve 22, first flat key 23, second flat key 24, guide rod 25, spring 26, spring adjuster 27, supporting plate 28, cushion block 29, sliding shaft 30, limiting cone sleeve 31, limiting nut 32, limiting plate 33, limiting rod 34, third flat key 35, cylinder 36, front flange 37, locking nut 3 8. Guide bolt 39, cylinder nut 40, head and tail seat 41, guide shaft 42, positioning core 43, support plate 44, V-shaped bracket 45, support 46, first thin cylinder 47, first limiting bolt 48, first slider 49, positioning plate 50, positioning pin 51, baffle 52, positioning seat 53, positioning rod 54, spring 55, nut 56, support 57, second thin cylinder 58, second limiting bolt 59, second slider 60, positioning plate 61, positioning pin 62, U-shaped positioning block 63, base 64, guide rail groove 65, third guide rail 66, positioning core 67, handle 68, pressure plate 69, cushion block 70, quick clamp 71, V-shaped positioning block 72, height adjustment gasket 73, rear axle housing assembly 74, buffer seat 75, buffer seat bracket assembly 76, shock absorber bracket assembly 77. DETAILED DESCRIPTION

[0015] The present invention can be specifically implemented through the techniques described in the content of the invention. The present invention can be further described through the following embodiments. The scope of the present invention is not limited to the following embodiments.

[0016] like Figures 1 to 10 As shown, a buffer seat, a buffer seat bracket assembly, a shock absorber bracket assembly and a rear axle housing assembly assembly welding fixture includes a tooling platform 1, a center positioning mechanism assembly 2, a head and tail seat assembly 3, a buffer seat positioning device 4, a buffer seat bracket assembly positioning device 5, a shock absorber bracket assembly positioning device 6, a T-nut 7, and a flat key 8.

[0017] The center positioning mechanism assembly 2 is positioned by the middle keyway flat key 8 and fixed to the tooling platform 1 by four screws; the head and tail seat assembly 3, the buffer seat positioning device 4, and the buffer seat bracket assembly positioning device 5 are connected by bolts and T-nuts 7 and are respectively installed on the first guide rail 11 of the tooling platform 1; the shock absorber bracket assembly positioning device 6 is connected by bolts and T-nuts 7 on the left and right and is respectively installed on the second guide rail 14 of the tooling platform 1.

[0018] The tooling platform 1 includes a base frame 9, a base plate 10, a first guide rail 11, a manual valve mounting support 12, a manual valve 13, a second guide rail 14, and a positioning pin 15; the base frame 9 is welded with angle steel, the base plate 10 is welded on the base frame 9, the first guide rail 11 and the second guide rail 14 are fixedly connected to the base frame 9 by screws and positioning pins 15; the manual valve mounting support 12 is welded with angle steel and Q235 steel plate, the manual valve mounting support 12 is welded on the base plate 10, and the manual valve 13 is fixedly connected to the manual valve mounting support 12 by screws. The center positioning mechanism assembly 2 includes a center base 16, a cylinder 17, a connecting flange 18, a connecting nut 19, a connecting body 20, a center seat 21, a connecting sleeve 22, a first flat key 23, a second flat key 24, a guide rod 25, a spring 26, a spring adjuster 27, a supporting plate 28, a cushion block 29, a sliding shaft 30, a limiting cone sleeve 31, a limiting nut 32, a limiting plate 33, a limiting rod 34, and a third flat key 35. The center base 16 is made of 45# steel plate welded and processed, and the center seat 21 is first cast and processed by HT200; the cylinder 17 is fixedly connected to the connecting flange 18 by screws, and the coupling body 20 is connected to the extended shaft of the cylinder 17 through its own internal thread; the connecting nut 19 is sleeved on the inner side of the connecting body 20 and the extended shaft of the cylinder 17 and is installed together with the internal thread of the guide rod 25; one end of the connecting sleeve 22 is sleeved on the connecting body 20, the second flat key 24 is fixedly connected to the keyway of the guide rod 25 by screws, the guide rod 25 is connected to the center seat 21 by the second flat key 24, and the connecting flange 18 is fixedly connected to the center seat 21 by screws; the supporting plate 28 is fixedly connected to the guide rod 25 by screws, and the cushion block 29 is fixed by screws The first flat key 23 is fixedly connected to the keyway of the sliding shaft 30 by screws, the spring adjuster 27 is connected to the inner cavity of the sliding shaft 30 by screws, the limit nut 32 is connected to the sliding shaft 30 by threads, the other end of the connecting sleeve 22 is installed together with the spring 26 in the inner cavity of the guide rod 25 and the sliding shaft 30, the sliding shaft 30 is connected to the inner cavity of the guide rod 25 by the first flat key 23, and the limit plate 33 is connected to the supporting disk 28 by screws; the limit cone sleeve 31 is fixedly connected to the sliding shaft 30 by screws; the limit rod 34 is connected in series in the two holes of the supporting disk 28 and the center seat 21; the third flat key 35 is connected to the center seat 21 by screws, and the center seat 21 is connected to the center base 16 by the third flat key 35 and screws.

[0019] The head and tail seat assembly 3 includes a cylinder 36, a front flange 37, a locking nut 38, a guide bolt 39, a cylinder nut 40, a head and tail seat 41, a guide shaft 42, a positioning core 43, a support plate 44, and a V-shaped bracket 45. The head and tail seat 41 is firstly cast and processed by HT200, the support plate 44 and the V-shaped bracket 45 are welded by 45# steel plate, the cylinder 36 is fixedly connected to the front flange 37 by screws, the cylinder 36 is connected to the guide shaft 42 by the locking nut 38 and the cylinder nut 40, the guide shaft 42 is connected to the head and tail seat 41 by clearance fit, the front flange 37 is fixedly connected to the head and tail seat 41 by screws, the guide bolt 39 is fixedly connected to the head and tail seat 41, the positioning core 43 is fixedly connected to the guide shaft 42 by screws, the support plate 44 is fixedly connected to the head and tail seat 41 by screws, and the V-shaped bracket 45 is fixedly connected to the head and tail seat 41 by screws.

[0020] The buffer seat positioning device 4 includes a support 46 , a first thin cylinder 47 , a first limiting bolt 48 , a first slider 49 , a positioning plate 50 , a positioning pin 51 , a baffle 52 , a positioning seat 53 , a positioning rod 54 , a spring 55 , and a nut 56 . The support 46 is made of 45# steel plate welded and processed; the first thin cylinder 47 is fixedly connected to the support 46 by screws, the first slider 49 is connected to the extended shaft of the first thin cylinder 47 by screws, the first limit bolt 48 is connected to the support 46, the first limit bolt 48 is stuck in the groove of the first slider 49, the first slider 49 is connected to the inner cavity of the support 46 by clearance fit, the positioning plate 50 is positioned by the slot and fixedly connected to the first slider 49 by screws, the positioning pin 51 is connected to the positioning plate 50 by interference fit, the positioning seat 53 is positioned by the slot and fixedly connected to the positioning plate 50 by screws, the positioning rod 54 is installed in the hole of the positioning seat 53, the spring 55 is sleeved on the positioning rod 54, the baffle 52 is threadedly connected to the positioning plate 50 through the slot with the positioning rod 54, and the positioning rod 54 is threadedly connected to the positioning plate 50 through the slot, and the positioning seat 53 is threadedly connected to the positioning seat 53 with the nut 56.

[0021] The buffer seat bracket assembly positioning device 5 includes a support 57, a second thin cylinder 58, a second limiting bolt 59, a second slider 60, a positioning plate 61, a positioning pin 62, and a U-shaped positioning block 63. The support 57 is made of 45# steel plate by welding; the second thin cylinder 58 is fixedly connected to the support 57 by screws, the second slider 60 is connected to the extended shaft of the second thin cylinder 58 by screws, the second limiting bolt 59 is connected to the support 57, the second limiting bolt 59 is stuck in the groove of the second slider 60, the second slider 60 is connected to the inner cavity of the support 57 by clearance fit, the positioning plate 61 is fixedly connected to the second slider 60 by slot positioning and screws, the positioning pin 62 is connected to the positioning plate 61 by interference fit, and the U-shaped positioning block 63 is fixedly connected to the positioning plate 61 by slot positioning and screws.

[0022] The shock absorber bracket assembly positioning device 6 includes a base 64, a guide groove 65, a third guide rail 66, a positioning core 67, a handle 68, a pressure plate 69, a cushion block 70, a quick clamp 71, a V-shaped positioning block 72, and a height adjustment gasket 73. The base 64 is made of 45# steel plate welded and processed; the positioning core 67 and the handle 68 are fixedly connected to the third guide rail 66 by screws, the guide groove 65 is connected to the base 64 by slot positioning, the third guide rail 66 is connected to the guide groove 65 by slot positioning, the pressure plate 69 and the guide groove 65 are fixedly connected to the base 64 by screws, the quick clamp 71 and the cushion block 70 are fixedly connected to the base 64 by screws, and the V-shaped positioning block 72 and the height adjustment gasket 73 are fixedly connected to the base 64 by slot positioning and screws.

[0023] The specific welding process is as follows: Step 1: First, install the workpiece buffer seat 75 on the positioning pin 51 on the buffer seat positioning device 4, so that the bottom surface of the buffer seat 75 contacts the positioning plate 50, and under the elastic force of the spring 55, one side end surface of the buffer seat 75 contacts the baffle plate 52.

[0024] Step 2: Install the workpiece buffer seat bracket assembly 76 on the positioning pin 62 on the buffer seat bracket assembly positioning device 5 , the bottom surface of the buffer seat bracket assembly 76 contacts the positioning plate 61 , and the bracket pin on the buffer seat bracket assembly 76 is stuck in the U-shaped positioning block 63 .

[0025] Step 3: Place the flange heads at both ends of the rear axle housing assembly 74 on the V-shaped bracket 45 on the head and tail seat assembly 3, pull the manual valve 13 of the cylinder 36 on the tail seat assembly 3 at both ends, and the cylinder 36 pushes the guide shaft 42 to press the positioning core 43 into the flange head holes at both ends of the rear axle housing assembly 74, and the rear axle housing assembly 74 is axially positioned; pull the manual valve 13 of the cylinder 17 on the control center positioning mechanism assembly 2, and the cylinder 17 pushes the guide rod 25 to press the limiting cone sleeve 31 into the center hole of the rear axle housing assembly 74, and the two pads 29 on the support plate 28 are in contact with the large central flange surface of the rear axle housing assembly 74, and the rear axle housing assembly 74 is centrally positioned.

[0026] Step 4: Install the workpiece shock absorber bracket assembly 77 bracket pin cylinder on the V-shaped positioning block 72 of the shock absorber bracket assembly positioning device 6, with the shock absorber bracket assembly 77 bracket pin end face close to the V-shaped positioning block 72 section, pull the quick clamp 71 to make the shock absorber bracket assembly 77 bracket pin cylinder close to the V-shaped positioning block 72; pull the handle 68 to move the third guide rail 66, so that the two arcs on the shock absorber bracket assembly 77 are in close contact with the rear axle housing assembly 74 bridge tube.

[0027] Step 5: Move the first thin cylinder 47 on the control buffer seat positioning device 4 and the second thin cylinder 58 manual valve 13 on the buffer seat bracket assembly positioning device 5 to make the two arcs on the buffer seat 75 and the two arcs of the buffer seat bracket assembly 76 fit tightly against the bridge pipe of the rear axle housing assembly 74 respectively.

[0028] Step 6: Spot welding, the spot welding parameters are current 180-240A, voltage 26-30V, gas flow 15-20L / Min, and spot welding is performed according to the process requirements. Through spot welding, the relevant dimensions of the buffer seat, buffer seat bracket assembly, and shock absorber bracket assembly are consistent with the relevant dimensions of the drawings.

[0029] Step 7: After the welding points are fixed, release the quick clamp 71, and pull the three manual valves 13 to separate the tail seat assembly 3, the center positioning mechanism assembly 2, the buffer seat positioning device 4, and the buffer seat bracket assembly positioning device 5 from the workpiece; then take out the rear axle housing assembly that has been fixed by the sling.

[0030] The invention is simple to operate and has stable effects. It ensures the dimensional accuracy and stability of the assembly and welding of the buffer seat, the buffer seat bracket assembly, the shock absorber bracket assembly and the rear axle housing assembly, ensures product quality, greatly improves processing efficiency, and reduces the labor intensity of workers. The invention is suitable for a wide range of products. Through the assembly and welding of the buffer seat, the buffer seat bracket assembly, the shock absorber bracket assembly and the rear axle housing assembly, the quality is stable.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A welding fixture for assembling a buffer seat, a buffer seat bracket assembly, a shock absorber bracket assembly and a rear axle housing assembly, characterized in that: It comprises a tooling platform (1), a center positioning mechanism assembly (2), a head and tail seat assembly (3), a buffer seat positioning device (4), a buffer seat bracket assembly positioning device (5), and a shock absorber bracket assembly positioning device (6); Wherein, the center positioning mechanism assembly (2) is fixed on the tooling platform (1); the head and tail seat assembly (3), the buffer seat positioning device (4), and the buffer seat bracket assembly positioning device (5) are respectively installed on the first guide rail (11) of the tooling platform (1); The shock absorber bracket assembly positioning device (6) is mounted on the second guide rail (14) of the tooling platform (1).

2. The assembly welding fixture of the buffer seat, the buffer seat bracket assembly, the shock absorber bracket assembly and the rear axle housing assembly according to claim 1 is characterized in that: The tooling platform (1) comprises a base frame (9), a base plate (10), a first guide rail (11), a manual valve mounting support (12), a manual valve (13), a second guide rail (14), and a positioning pin (15); The base frame (9) is welded by angle steel, the base plate (10) is welded to the base frame (9), and the first guide rail (11) and the second guide rail (14) are fixedly connected to the base frame (9) by means of screws and the positioning pins (15); The manual valve mounting support (12) is welded to the base plate (10), and the manual valve (13) is fixedly connected to the manual valve mounting support (12) by means of screws.

3. The assembly welding fixture of a buffer seat, a buffer seat bracket assembly, a shock absorber bracket assembly and a rear axle housing assembly according to claim 1 or 2, characterized in that: The center positioning mechanism assembly (2) comprises a center base (16), a cylinder (17), a connecting flange (18), a connecting nut (19), a connecting body (20), a center seat (21), a connecting sleeve (22), a first flat key (23), a second flat key (24), a guide rod (25), a spring (26), a spring adjuster (27), a supporting plate (28), a cushion block (29), a sliding shaft (30), a limiting cone sleeve (31), a limiting nut (32), a limiting plate (33), a limiting rod (34), and a third flat key (35); The cylinder (17) is fixedly connected to the connecting flange (18) by screws, and the connecting body (20) is connected to the protruding shaft of the cylinder (17) by its internal thread; The coupling nut (19) is sleeved on the inner side of the connecting body (20) and the extended shaft of the cylinder (17) and is connected to the guide rod (25); One end of the coupling sleeve (22) is connected to the coupling body (20), the second flat key (24) is fixedly connected to the keyway of the guide rod (25), the guide rod (25) is connected to the center seat (21) via the second flat key (24), and the connecting flange (18) is fixedly connected to the center seat (21); The support plate (28) is fixedly connected to the guide rod (25), and the cushion block (29) is fixedly connected to the support plate (28) by screws; The first flat key (23) is fixedly connected to the keyway of the sliding shaft (30), the spring adjuster (27) is connected to the inner cavity of the sliding shaft (30), the limit nut (32) is connected to the sliding shaft (30) by means of a thread, the other end of the connecting sleeve (22) is installed together with the spring (26) in the inner cavity of the guide rod (25) and the sliding shaft (30), the sliding shaft (30) is connected to the inner cavity of the guide rod (25) by means of the first flat key (23), and the limit plate (33) is connected to the supporting plate (28); The limiting cone sleeve (31) is fixedly connected to the sliding shaft (30); the limiting rod (34) is connected in series with the supporting plate (28) in two holes of the center seat (21); The third flat key (35) is connected to the center seat (21), and the center seat (21) is connected to the center base (16) via the third flat key (35) and screws.

4. The assembly welding fixture of the buffer seat, the buffer seat bracket assembly, the shock absorber bracket assembly and the rear axle housing assembly according to claim 3 is characterized in that: The head and tail seat assembly (3) comprises a cylinder (36), a front flange (37), a locking nut (38), a guide bolt (39), a cylinder nut (40), a head and tail seat (41), a guide shaft (42), a positioning core (43), a support plate (44), and a V-shaped bracket (45); The cylinder (36) is fixedly connected to the front flange (37), the cylinder (36) is connected to the guide shaft (42) through a locking nut (38) and a cylinder nut (40), the guide shaft (42) is connected to the head and tail seats (41) through a clearance fit, the front flange (37) is fixedly connected to the head and tail seats (41), the guide bolt (39) is fixedly connected to the head and tail seats (41), the positioning core (43) is fixedly connected to the guide shaft (42), the support plate (44) is fixedly connected to the head and tail seats (41), and the V-shaped bracket (45) is fixedly connected to the head and tail seats (41).

5. The assembly welding fixture of the buffer seat, the buffer seat bracket assembly, the shock absorber bracket assembly and the rear axle housing assembly according to claim 3 is characterized in that: The buffer seat positioning device (4) comprises a support (46), a first thin cylinder (47), a first limiting bolt (48), a first slider (49), a positioning plate (50), a positioning pin (51), a baffle (52), a positioning seat (53), a positioning rod (54), a spring (55), and a nut (56); The first thin cylinder (47) is fixedly connected to the support (46), the slider (49) is connected to the extended shaft of the first thin cylinder (47), the first limiting bolt (48) is connected to the support (46), the first limiting bolt (48) is engaged in the groove of the first slider (49), the first slider (49) is connected to the inner cavity of the support (46) through clearance fit, and the positioning plate (50) is connected to the first slider (49) through positioning in the slot and fixed by screws. The positioning pin (51) is connected to the positioning plate (50) by interference fit, the positioning seat (53) is connected to the positioning plate (50) by means of a slot positioning and a screw fixation, the positioning rod (54) is installed in a hole of the positioning seat (53), the spring (55) is sleeved on the positioning rod (54), the baffle plate (52) is connected to the positioning plate (50) by means of the positioning rod (54), and the positioning rod (54) and the nut (56) are threadedly connected to the positioning seat (53).

6. The assembly welding fixture of the buffer seat, the buffer seat bracket assembly, the shock absorber bracket assembly and the rear axle housing assembly according to claim 3 is characterized in that: The buffer seat bracket assembly positioning device (5) comprises a support (57), a second thin cylinder (58), a second limit bolt (59), a slider (60), a positioning plate 61, a positioning pin 62, and a U-shaped positioning block 63; The second thin cylinder 58 is fixedly connected to the support (57) by screws, the second slider (60) is connected to the extended shaft of the second thin cylinder (58) by screws, the second limiting bolt (59) is connected to the support (57), the second limiting bolt (59) is clamped in the groove of the second slider (60), the second slider (60) is connected to the inner cavity of the support (57) by clearance fit, the positioning plate (61) is positioned by the slot and fixedly connected to the second slider (60) by screws, the positioning pin (62) is connected to the positioning plate (61) by interference fit, and the U-shaped positioning block (63) is positioned by the slot and fixedly connected to the positioning plate (61) by screws.

7. The assembly welding fixture of the buffer seat, the buffer seat bracket assembly, the shock absorber bracket assembly and the rear axle housing assembly according to claim 3 is characterized in that: The shock absorber bracket assembly positioning device (6) comprises a base (64), a guide rail groove (65), a third guide rail (66), a positioning core (67), a handle (68), a pressure plate (69), a cushion block (70), a quick clamp (71), a V-shaped positioning block (72), and a height adjustment gasket (73); The positioning core (67) and the handle (68) are fixedly connected to the third guide rail (66); the guide rail groove (65) is positioned and connected to the base (64) via a clamping groove; the third guide rail (66) is positioned and connected to the guide rail groove (65) via a clamping groove; the pressure plate (69) and the guide rail groove (65) are fixedly connected to the base (64); the quick clamp (71) and the cushion block (70) are fixedly connected to the base (64); and the V-shaped positioning block (72) and the height adjustment cushion (73) are fixedly connected to the base (64).

8. A method for using a welding fixture for assembling a buffer seat, a buffer seat bracket assembly, a shock absorber bracket assembly and a rear axle housing assembly, characterized in that: The steps include: S1: The buffer seat (75) of the workpiece is mounted on the positioning pin (51) on the buffer seat positioning device (4), the bottom surface of the buffer seat (75) contacts the positioning plate (50), and one end surface of the buffer seat (75) contacts the baffle plate (52) under the elastic force of the spring (55); S2: The workpiece buffer seat bracket assembly (76) is mounted on the positioning pin (62) on the buffer seat bracket assembly positioning device (5), the bottom surface of the buffer seat bracket assembly (76) contacts the positioning plate (61), and the bracket pin on the buffer seat bracket assembly (76) is stuck in the U-shaped positioning block (63); S3: Place the flange heads at both ends of the rear axle housing assembly (74) on the V-shaped bracket (45) on the head and tail seat assembly (3), and turn the manual valve (13) of the cylinder (36) on the tail seat assembly (3) at both ends, so that the cylinder (36) pushes the guide shaft (42) to press the positioning core (43) into the flange head holes at both ends of the rear axle housing assembly (74), and the rear axle housing assembly (74) is axially positioned; turn the manual valve (13) of the cylinder (17) on the center positioning mechanism assembly (2), so that the cylinder (17) pushes the guide rod (25) to press the limiting cone sleeve (31) into the center hole of the rear axle housing assembly (74), and the two pads (29) on the support plate (28) contact the large central flange surface of the rear axle housing assembly (74), and the rear axle housing assembly (74) is centrally positioned; S4: The support pin cylinder of the workpiece shock absorber support assembly (77) is mounted on the V-shaped positioning block (72) of the shock absorber support assembly positioning device (6), the end surface of the support pin of the shock absorber support assembly (77) is closely attached to the cross section of the V-shaped positioning block (72), and the quick clamp (71) is pulled to make the support pin cylinder of the shock absorber support assembly (77) closely attached to the V-shaped positioning block (72); The handle (68) is turned to move the third guide rail (66) so that the two arcs on the shock absorber bracket assembly (77) are closely attached to the bridge tube of the rear axle housing assembly (74); S5: turning the first thin cylinder (47) on the control buffer seat positioning device (4) and the second thin cylinder (58) manual valve (13) on the buffer seat bracket assembly positioning device (5) to respectively make the two arcs on the buffer seat (75) and the two arcs of the buffer seat bracket assembly (76) closely attached to the bridge tube of the rear axle housing assembly (74); S6: Spot welding, the spot welding parameters are current 180-240A, voltage 26-30V, gas flow 15-20L / Min, spot welding is carried out according to the process requirements; S7: After the welding point is fixed, release the quick clamp (71), and operate the three manual valves (13) to separate the tailstock assembly (3), the center positioning mechanism assembly (2), the buffer seat positioning device (4), and the buffer seat bracket assembly positioning device (5) from the workpiece; then, take out the rear axle housing assembly after the assembly point is fixed by the lifting device.

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