CN204747866U - Passenger train rear -axle housing hydraulic tool equipment for spot welding - Google Patents

Abstract

The utility model relates to a hydraulic tooling for spot welding of the rear axle housing of a passenger car. The two ends of the rear axle housing are supported by two V-shaped frames, and the rear axle housing is pressed by a pressing mechanism. The position of the rear axle housing is adjusted by the centering mechanism and the leveling mechanism, the upper thrust rod support is supported and positioned by the upper thrust rod support positioning mechanism, and the air chamber support base is supported and positioned by the air chamber support base positioning mechanism. The utility model is a set The tooling can realize the spot welding processing of the three parts of the rear axle housing of the bus, the airbag support plate, the upper thrust rod support, and the base of the air chamber bracket. It has powerful functions. Under the clamping force of the hydraulic system, the rear axle housing can be guaranteed The rough joint surfaces of the airbag support plate, the upper thrust rod support, and the air chamber support base should be as close as possible. After the welding is completed, it has a better stress effect, and can effectively avoid the occurrence of early failure and cracking of the weld due to poor bonding.

Description

Hydraulic Tooling for Spot Welding of Passenger Car Rear Axle Housing

Technical field:

The utility model relates to the technical field of production equipment for passenger car axle housings, in particular to a hydraulic tooling used for spot welding of passenger car rear axle housings, airbag support plates, upper thrust rod supports and air chamber support bases.

Background technique:

Passenger car drive axle housing The drive axle housing is one of the important parts of the car, which supports the load of the car and transmits the load to the wheels. The traction force, braking force, lateral force and vertical force acting on the driving wheels are also transmitted to the suspension or chassis through the axle housing. Therefore, the drive axle housing of a bus is not only a load-bearing part, but also a force-transmitting part, and it is also the carrier and shell of the main reducer, differential and transmission of a bus. The airbag supporting plate plays the role of connecting the entire air suspension. If the welding error and processing error between the airbag supporting plate and the axle housing are too large, the passenger car suspension will not be able to be installed. The upper thrust rod support plays the role of connecting the axle and the frame, and transmits the driving force generated by the rotation of the axle to the frame to push the whole bus to run. If there are welding errors and processing errors between the upper thrust rod support and the axle housing If it is too large, it will easily lead to cracking of the support of the upper thrust rod during the operation of the bus, interruption of power transmission, and failure of the whole vehicle to run.

At present, the traditional bus rear axle housing, airbag support plate and upper thrust rod support spot welding tooling can only adapt to the spot welding of a single type of axle housing, and most of them are mechanically or pneumatically clamped and positioned. From the perspective of force , due to the mechanical or pneumatic clamping method, the joint surface between the rear axle housing and the airbag support plate of the passenger car or the joint surface between the rear axle housing and the upper thrust rod support is generally a rough surface, and it is difficult to achieve a tight fit. Uneven clamping force is prone to occur during the process. If there is a large gap, the weld is extremely prone to failure and cracking during the stress process.

Utility model content:

To sum up, in order to overcome the deficiencies of the existing technical problems, the utility model provides a hydraulic tooling for the spot welding of the rear axle housing of a passenger car. The spot welding processing of the three parts of the seat and the air chamber bracket base is powerful. Under the clamping force of the hydraulic system, the blanks of the rear axle housing and the air bag support plate, the upper thrust rod support, and the air chamber bracket base can be guaranteed. The bonding surface should be as close as possible. After the welding is completed, it has a better stress effect, and can effectively avoid the occurrence of early failure and cracking of the weld due to poor bonding. At the same time, the utility model has strong versatility, a set of tooling can be applied to different types of rear axle housings, and has a simple structure and high processing precision.

In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:

A hydraulic tooling for spot welding of the rear axle housing of a passenger car, which includes a base, two V-shaped frames, a moving carrier, a pressing mechanism, an upper thrust rod support positioning mechanism, a centering mechanism, a leveling mechanism, and an air chamber support base Positioning mechanism and airbag supporting plate positioning mechanism, two V-shaped frames are respectively arranged at both ends of the base, and the two V-shaped frames support the two ends of the rear axle housing, and the middle part of the base is provided with a The mobile carrier that moves in the direction, the base is provided with two airbag supporting plate positioning mechanisms and two pressing mechanisms, the airbag supporting plate positioning mechanism positions and supports the airbag lower supporting plate, and the pressing mechanism compresses the rear axle housing. The middle part of the mobile carrier is equipped with a centering mechanism and a leveling mechanism, which are arranged up and down. The centering mechanism is set between the two leveling heads of the leveling mechanism. The centering mechanism and the leveling mechanism adjust the rear axle. Shell position, the top of the mobile carrier is provided with an upper thrust rod support positioning mechanism, the upper thrust rod support positioning mechanism supports and positions the upper thrust rod support, and both sides of the mobile carrier are provided with an air chamber support base for positioning Mechanism, the air chamber support base positioning mechanism supports and positions the air chamber support base.

Further, the pressing mechanism includes a pressing seat, a pressing oil cylinder, a pressing bracket and a pressing head, the described pressing seat is fixed on the base, the pressing oil cylinder is tightly connected with the upper part of the pressing seat, and the pressing The middle part of the bracket is hinged to the upper part of the compression seat, the piston rod of the compression cylinder is connected to one end of the compression bracket, and the other end of the compression bracket is provided with a compression head, which compresses the rear axle housing .

Further, the airbag pallet positioning mechanism includes a frame, a pallet lifting cylinder, a middle sleeve, a middle plate, a lower elastic sleeve, a universal connection block, a top plate, a top sleeve, an upper elastic sleeve, a sleeve shaft, a connecting key, a bracket The plate positioning plate and the supporting plate positioning pin, the frame is fixed on the base, the supporting plate lifting cylinder is arranged in the frame, the plunger of the supporting plate lifting cylinder is connected with the middle sleeve, the top of the middle sleeve supports the middle plate, and the outer sleeve of the middle sleeve has The lower elastic sleeve, the upper end of the lower elastic sleeve is tightly connected with the bottom surface of the middle plate, the lower end of the lower elastic sleeve is tightly connected with the top surface of the bracket, the middle part of the top of the middle plate is provided with a universal connection block, and the universal ball of the universal connection block The top end is connected with the bottom surface of the top plate, the top sleeve is arranged on the bottom surface of the top plate, and the upper elastic sleeve is arranged between the lower end surface of the top sleeve and the top surface of the middle plate. Tightly connected, the top surface of the top plate is connected with the supporting plate positioning plate through the connection key, the supporting plate positioning pin is arranged on the supporting plate positioning plate, and the airbag supporting plate is connected with the supporting plate positioning plate through the supporting plate positioning pin.

Further, the base positioning mechanism of the air chamber bracket includes a support block, a base oil cylinder, a base positioning block and a base positioning hole, the support block is fixed to the side of the mobile carrier, the base oil cylinder is fixed on the support block, and the column of the base oil cylinder The plug is connected with the bottom surface of the base positioning block, the base positioning block is provided with a base positioning hole, and the air chamber support base is connected with the base positioning block through the base positioning hole and supporting pins.

Further, the upper thrust rod support positioning mechanism includes a support positioning plate, a support lifting cylinder, an oil cylinder frame, a vertical slideway and a vertical slide bar, the oil cylinder frame is fixed on the top of the mobile carrier, and the oil cylinder frame is fixed on the top of the mobile carrier. There is a support lift cylinder, the plunger of the support lift cylinder is connected to the support positioning plate, the support positioning plate is connected to the vertical slide bar, the vertical slide bar is set in the vertical slideway, and the support positioning plate is provided with support positioning pins , the vertical slide rod between the support positioning plate and the cylinder frame has an elastic sleeve.

Further, the centering mechanism includes a centering frame, a centering oil cylinder, a centering slide bar, a centering block, a centering gear, a centering rack and a vertical rack. The centering frame is provided with a centering oil cylinder. The plunger of the middle oil cylinder is connected with the center slide rod, which is installed in the center slide sleeve, and the center slide sleeve is fixed on the center frame. The upper end of the center slide rod is provided with a vertical rack, and the vertical rack Two centering gears are arranged on the centering frame on both sides, and the vertical rack meshes with the two centering gears. The middle gear meshes, and the outer end of the middle rack is fixed with a middle block.

Further, the leveling mechanism includes two leveling devices and a leveling oil cylinder. The two leveling devices have the same structure, including a leveling rod, a leveling gear, a leveling rack and a leveling frame. The lower end of the leveling rod It is connected with the leveling rack, the leveling rack is connected with the plunger of the leveling oil cylinder, the leveling oil cylinder is connected with the mobile carrier, the leveling rack and the leveling gear mesh with each other, the leveling gear is arranged in the leveling frame, and The leveling gears of the upper and lower leveling devices are respectively arranged at the two ends of the connecting rod, and the top surfaces of the leveling rods of the upper and lower leveling devices are on the same horizontal plane.

The beneficial effects of the utility model are:

1. A set of tooling of the utility model can realize the spot welding processing of the three parts of the passenger car rear axle housing and the air bag support plate, the upper thrust rod support, and the air chamber support base. In this way, it can be ensured that the rough joint surfaces of the rear axle housing and the airbag support plate, the upper thrust rod support, and the base of the air chamber bracket are as close as possible. After the welding is completed, it has a better stress effect, and can effectively avoid the occurrence of early failure and cracking of the weld due to poor bonding. At the same time, the utility model has strong versatility, a set of tooling can be applied to different types of rear axle housings, and has a simple structure and high processing precision.

2. The utility model establishes a process benchmark through two V-shaped frames to support the round tube of the rear axle housing, and centers the installation hole of the main reducer of the rear axle housing through the centering mechanism, thereby realizing the centering of the rear axle housing blank. Positioning can effectively ensure the consistency of the rear axle housing blank after machining, and at the same time ensure the accuracy of spot welding dimensions of components.

3. The pressing mechanism of the utility model adopts hydraulic clamping. The positioning mechanism of the upper thrust rod support, the positioning mechanism of the base of the air chamber bracket, and the positioning mechanism of the airbag support plate are all driven by hydraulic cylinders. In addition, the positioning mechanism of the upper thrust rod support and the positioning mechanism of the airbag support plate are universal floating mechanisms. While under pressure, it can float freely within a certain range to ensure that the upper thrust rod support and the airbag support plate are closely attached to the axle housing.

4. The utility model has the advantages of simple structure, convenient use, safety and reliability, simple manufacture, and is suitable for mass production. The shell blank fits together to provide stable support for spot welding, improve the force between the various parts, and ensure that the welding is firm.

Description of drawings:

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the structural representation of the pressing mechanism of the present utility model;

Fig. 3 is a structural schematic diagram of the positioning mechanism of the airbag pallet of the present invention;

Fig. 4 is a schematic sectional view of A-A of Fig. 3 of the present utility model;

Fig. 5 is the structural representation of the centering mechanism of the present utility model;

Fig. 6 is a schematic structural view of the leveling mechanism of the present invention;

Fig. 7 is a structural schematic diagram of the positioning mechanism of the upper thrust rod support of the present invention;

Fig. 8 is a schematic diagram of the use state of the utility model.

Detailed ways:

Below in conjunction with accompanying drawing, the utility model is described in further detail.

As shown in Figures 1 and 2, a hydraulic tooling for spot welding of rear axle housings of passenger cars, including a base 1, two V-shaped frames 2, a moving carrier 3, a pressing mechanism 4, an upper thrust rod support positioning mechanism 5, Centering mechanism 6, leveling mechanism 7, air chamber support base positioning mechanism 8 and airbag supporting plate positioning mechanism 9, two V-shaped frames 2 are respectively arranged on the two ends of the base 1, and two V-shaped frames 2 support the bridge At both ends of the shell, the middle part of the base 1 is provided with a mobile carrier 3 that can move along the direction perpendicular to the length of the base 1, and the base 1 is provided with two airbag pallet positioning mechanisms 9 and two pressing mechanisms 4 , the airbag supporting plate positioning mechanism 9 positions and supports the lower supporting plate of the airbag, and the described pressing mechanism 4 includes a pressing seat 10, a pressing oil cylinder 11, a pressing bracket 12 and a pressing head 13, and the described pressing seat 10 is fixed On the base 1, the compression oil cylinder 11 is tightly connected with the upper part of the compression seat 10, the middle part of the compression bracket 12 is hinged with the upper part of the compression seat 10, and the piston rod of the compression oil cylinder 11 is connected with one end of the compression bracket 12. connection, the other end of the compression bracket 12 is provided with a compression head 13, and the compression head 13 compresses the rear axle housing. Both sides of the mobile carrier 3 are provided with an air chamber support base positioning mechanism 8, the air chamber support base positioning mechanism 8 supports and positions the air chamber support base 1, and the air chamber support base positioning mechanism 8 includes a support block 28, a base oil cylinder 29, and a base positioning block 30 and the base positioning hole 31, the support block 28 is fixed to the side of the mobile carrier 3, the base oil cylinder 29 is fixed on the support block 28, the plunger of the base oil cylinder 29 is connected with the bottom surface of the base positioning block 30, and the base positioning The block 30 is provided with a base positioning hole 31, and the air chamber support base 1 is connected with the base positioning block 30 through the base positioning hole 31 and supporting pins.

As shown in Fig. 3 and Fig. 4, the airbag pallet positioning mechanism 9 includes a frame 14, a pallet lifting cylinder 15, a middle cover 16, a middle plate 17, a lower elastic sleeve 18, a universal connecting block 19, a top plate 20, and a top cover 21. Upper elastic sleeve 22, sleeve shaft 23, connection key 24, pallet positioning plate 25 and pallet positioning pin 27, frame 14 is fixed on base 1, pallet lifting cylinder 15 is arranged in frame 14, pallet The plunger with sense of lifting is connected with the middle sleeve 16, the top of the middle sleeve 16 supports the middle plate 17, the middle sleeve 16 is covered with a lower elastic sleeve 18, the upper end of the lower elastic sleeve 18 is tightly connected with the bottom surface of the middle plate 17, and the lower elastic sleeve 18 The lower end is tightly connected with the top surface of the bracket, the middle part of the top of the middle plate 17 is provided with a universal connection block 19, the universal ball end of the universal connection block 19 is connected with the bottom surface of the top plate 20, and the bottom surface of the top plate 20 is provided with a top sleeve 21, An upper elastic sleeve 22 is arranged between the lower end surface of the top sleeve 21 and the top surface of the middle plate 17, and the sleeve shaft 23 is worn in the top sleeve 21 and the upper elastic sleeve 22, and the lower end of the sleeve shaft 23 is tightly connected with the middle plate 17. The top surface of described top plate 20 is connected with supporting plate positioning plate 25 by connecting key 24, supporting plate positioning plate 25 is provided with supporting plate positioning pin 27, and airbag supporting plate is connected with supporting plate positioning plate 25 by supporting plate positioning pin 27.

As shown in Figure 1, Figure 5, and Figure 6, the middle part of the mobile carrier 3 is provided with a centering mechanism 6 and a leveling mechanism 7, the centering mechanism 6 and the leveling mechanism 7 are arranged up and down, and the centering mechanism 6 is arranged on the leveling mechanism 7 Between the two leveling heads, the centering mechanism 6 and the leveling mechanism 7 adjust the position of the rear axle housing. The centering mechanism 6 includes a centering frame 38, a centering oil cylinder 39, a centering slide rod 40, a centering block 41, and a centering block 41. Middle gear 42, middle rack 43 and vertical rack 44 are divided, middle frame 38 is provided with middle oil cylinder 39, and the plunger of middle oil cylinder 39 is connected with middle slide bar 40, and middle slide bar 40 wears on In the middle sliding sleeve 26, the middle sliding sleeve 26 is fixed on the middle frame 38, the upper end of the middle sliding rod 40 is provided with a vertical rack 44, and the middle frame 38 on both sides of the vertical rack 44 is provided with two points. The middle gear 42, the vertical rack 44 meshes with two middle gears 42, and the top of the middle frame 38 is provided with two middle racks 43, and the two middle racks 43 mesh with two middle gears 42 respectively. The outer end of the centering rack 43 is fixed with a centering block 41 . The leveling mechanism 7 includes two leveling devices up and down and a leveling oil cylinder 45. The two leveling devices have the same structure, including a leveling rod 46, a leveling gear 47, a leveling rack 48 and a leveling frame 49, and the leveling rod The lower end of 46 is connected with the leveling rack 48, the leveling rack 48 is connected with the plunger of the leveling oil cylinder 45, the leveling oil cylinder 45 is connected with the mobile carrier 3, the leveling rack 48 is meshed with the leveling gear 47, and the leveling The gear 47 is arranged in the leveling frame 49, and the leveling gears 47 of the upper and lower two leveling devices are respectively arranged at the two ends of the connecting rod 50, and the top surfaces of the leveling rods 46 of the upper and lower two leveling devices are on the same horizontal plane superior.

As shown in Figure 1 and Figure 7, the top of the mobile carrier 3 is provided with an upper thrust rod bearing positioning mechanism 5, and the upper thrust rod bearing positioning mechanism 5 supports and positions the upper thrust rod bearing, and the upper thrust rod bearing positioning mechanism 5 includes Support positioning plate 32, support lifting oil cylinder 33, oil cylinder frame 34, vertical slideway 35 and vertical slide bar 36, described oil cylinder frame 34 is fixed on the top of mobile carrier 3, and oil cylinder frame 34 is fixed with support lifting oil cylinder 33, the plunger of the support lifting cylinder 33 is connected with the support positioning plate 32, the support positioning plate 32 is connected with the vertical slide bar 36, the vertical slide bar 36 is arranged in the vertical slideway 35, and the support positioning plate 32 is provided with The support positioning pin 37, the vertical slide bar 36 between the support positioning plate 32 and the cylinder frame 34 is covered with an elastic sleeve 51.

As shown in Figure 8, when in use, the direction of the rear cover of the rear axle housing is facing the processing person, the oil drain hole 52 of the rear axle housing is vertically downward, and the main minus installation plane 53 of the rear axle housing is facing the side of the tooling, according to this direction , put the rear axle housing into two V-shaped frames 2, and the two V-shaped frames 2 respectively support the cylinders at both ends of the rear axle housing, and then start the centering oil cylinder 39, and the plunger of the centering oil cylinder 39 stretches out, through the vertical The rack 44 drives the sub-center gear 42 to rotate, and the sub-center gear 42 drives the sub-center rack 43 to move to the left and right sides respectively, thereby driving the sub-center block 41 to move left and right, and the sub-center block 41 goes deep into the main reducer installation hole of the rear axle housing , by moving left and right of the middle block 41, the axle housing is driven to move left and right in the main reduction mounting hole of the rear axle housing, thereby dividing the rear axle housing to realize the central positioning of the rear axle housing.

After the centering is finished, start the leveling oil cylinder 45, and the plunger of the leveling oil cylinder 45 stretches out, driving one of the leveling racks 48 to move up and down, and the leveling rack 48 drives the leveling gear 47 meshed with it to rotate. The horizontal gear 47 drives the other leveling gear 47 to rotate through the connecting rod 50, thereby driving the meshing leveling rack 48 to move up and down, so that the two leveling rods 46 move up and down at the same time, and the two leveling rods 46 are at the same level , when the two leveling rods 46 protrude at the same time, contact with the main reducer installation surface of the rear axle housing, and push the axle housing to rotate until both leveling rods 46 are in contact with the main reducer installation surface of the rear axle case, thereby realizing the rear axle Shell leveling.

After the leveling is completed, start the compression cylinder 11, the piston rod of the compression cylinder 11 stretches out, and push the compression bracket 12 to rotate around its hinge point with the compression seat 10, so that the compression bracket 12 is provided with a compression head One end of 13 is pressed to the rear axle housing, and finally the compression head 13 is pressed against the rear axle housing to realize the compression of the rear axle housing.

After the rear axle housing is pressed, start the positioning mechanism 5 of the upper thrust rod support, the positioning mechanism 8 of the base of the air chamber bracket and the positioning mechanism 9 of the airbag support plate, and the support lifting cylinder 33 of the upper thrust rod support drives the support positioning plate 32 to Move down, so that the upper thrust rod support is pressed to the rear axle housing, so that the rear axle housing and the upper thrust rod support are firmly attached; the base oil cylinder 29 of the positioning mechanism 8 of the air chamber support base is activated, and the base positioning block 30 is driven by the plunger Move toward the rear axle housing, so that the air chamber bracket base 1 is close to the rear axle housing; the pallet lifting cylinder 15 of the airbag pallet positioning mechanism 9 is activated, and the plunger of the pallet lifting cylinder 15 drives the middle plate 17 upward through the middle sleeve 16 Move, and then push the top plate 20 to move upward through the universal connection block 19, and the top plate 20 is connected with the supporting plate positioning plate 25 through the connecting key 24, thereby driving the air bag supporting plate arranged on the supporting plate positioning plate 25 to stick upward to the rear axle housing , so far, the clamping of the upper thrust rod support, the airbag support plate and the air chamber support base 1 and the rear axle housing is completed. Finally, spot welding is performed to connect the upper thrust rod support, the air bag support plate and the air chamber support base 1 Welded to the rear axle housing blank.

It should be noted that the above-mentioned embodiment is an illustration of the technical solution of the utility model rather than a limitation, equivalent replacements by those of ordinary skill in the art or other modifications made according to the prior art, as long as they do not exceed the thinking of the technical solution of the utility model and scope should be included in the scope of rights required by the utility model.

Claims (7)

1. a rear axle of passenger vehicle shell spot welding hydraulic tool, it is characterized in that: comprise base (1), two V-type framves (2), mobile vehicle (3), hold-down mechanism (4), upper traction bar support detent mechanism (5), Fen Zhong mechanism (6), levelling gear (7), air chamber bracket base detent mechanism (8) and air bag supporting plate detent mechanism (9), described base (1) two ends are respectively arranged with two V-type framves (2), two V-type framves (2) support rear axle housing two ends, the middle part of described base (1) is provided with can along the mobile vehicle (3) perpendicular to base (1) length direction movement, described base (1) is provided with two air bag supporting plate detent mechanisms (9) and two hold-down mechanisms (4), air bag supporting plate detent mechanism (9) positioning supports air bag bottom plate, hold-down mechanism (4) compresses rear axle housing, described mobile vehicle (3) middle part is provided with Fen Zhong mechanism (6) and levelling gear (7), Fen Zhong mechanism (6) and levelling gear (7) are arranged up and down, Fen Zhong mechanism (6) is arranged between two leveling heads of levelling gear (7), Fen Zhong mechanism (6) and levelling gear (7) adjustment rear axle housing position, the top of described mobile vehicle (3) is provided with upper traction bar support detent mechanism (5), upper traction bar support detent mechanism (5) supporting and location upper traction bar support, described mobile vehicle (3) both sides are provided with air chamber bracket base detent mechanism (8), air chamber bracket base detent mechanism (8) supporting and location air chamber bracket base (1).

2. rear axle of passenger vehicle shell spot welding hydraulic tool according to claim 1, it is characterized in that: described hold-down mechanism (4) comprises pressed seat (10), compressed oil cylinder (11), compress support (12) and hold-down head (13), described pressed seat (10) is fixed on base (1), compressed oil cylinder (11) and pressed seat (10) top are fastenedly connected, compress middle part and pressed seat (10) upper articulation of support (12), the piston rod of described compressed oil cylinder (11) is connected with the one end compressing support (12), the other end of described compression support (12) is provided with hold-down head (13), hold-down head (13) compresses rear axle housing.

3. rear axle of passenger vehicle shell spot welding hydraulic tool according to claim 1, it is characterized in that: described air bag supporting plate detent mechanism (9) comprises frame (14), supporting plate hoist cylinder (15), intermediate sleeve (16), intermediate plate (17), lower resilient sleeve (18), universal contiguous block (19), top board (20), top cover (21), upper resilient sleeve (22), sleeve (23), connecting key (24), supporting plate location-plate (25) and supporting plate alignment pin (27), frame (14) is fixed on base (1), supporting plate hoist cylinder (15) is provided with in frame (14), the plunger of supporting plate hoist cylinder (15) is connected with intermediate sleeve (16), intermediate sleeve (16) apical support intermediate plate (17), lower resilient sleeve (18) is set with outside intermediate sleeve (16), lower resilient sleeve (18) upper end and intermediate plate (17) bottom surface are fastenedly connected, lower resilient sleeve (18) lower end and cradle top surface are fastenedly connected, described intermediate plate (17) top middle portion is provided with universal contiguous block (19), the universal pommel of universal contiguous block (19) is connected with top board (20) bottom surface, top board (20) bottom surface is provided with top cover (21), resilient sleeve (22) is provided with between top cover (21) lower surface and intermediate plate (17) end face, sleeve (23) is installed in top cover (21) and upper resilient sleeve (22), and sleeve (23) lower end and intermediate plate (17) are fastenedly connected, the end face of described top board (20) is connected with supporting plate location-plate (25) by connecting key (24), supporting plate location-plate (25) is provided with supporting plate alignment pin (27), air bag supporting plate is connected with supporting plate location-plate (25) by supporting plate alignment pin (27).

4. rear axle of passenger vehicle shell spot welding hydraulic tool according to claim 1, it is characterized in that: described air chamber bracket base detent mechanism (8) comprises back-up block (28), base oil cylinder (29), base locating piece (30) and base locating hole (31), described back-up block (28) is fixed with the side of mobile vehicle (3), back-up block (28) is fixed with base oil cylinder (29), the plunger of base oil cylinder (29) is connected with base locating piece (30) bottom surface, described base locating piece (30) is provided with base locating hole (31), air chamber bracket base (1) is connected with base locating piece (30) by base locating hole (31) and supporting pin.

5. rear axle of passenger vehicle shell spot welding hydraulic tool according to claim 1, it is characterized in that: described upper traction bar support detent mechanism (5) comprises bearing location-plate (32), bearing hoist cylinder (33), cylinder rack (34), vertical slideway (35) and vertical slide bar (36), described cylinder rack (34) is fixed on the top of mobile vehicle (3), cylinder rack (34) is fixed with bearing hoist cylinder (33), the plunger of bearing hoist cylinder (33) is connected with bearing location-plate (32), bearing location-plate (32) is connected with vertical slide bar (36), vertical slide bar (36) is arranged in vertical slideway (35), bearing location-plate (32) is provided with bearing alignment pin (37), described bearing location-plate (32) and the flexible cover of vertical slide bar (36) overcoat (51) between cylinder rack (34).

6. rear axle of passenger vehicle shell spot welding hydraulic tool according to claim 1, it is characterized in that: described Fen Zhong mechanism (6) comprises a point middle frame (38), oil cylinder (39) in point, slide bar (40) in point, block (41) in point, divide middle gear (42), divide middle rack (43) and vertical tooth rack (44), a point middle oil cylinder (39) is provided with in frame (38) in point, in point, the plunger of oil cylinder (39) is connected with a point middle slide bar (40), in point, slide bar (40) is installed in point middle sliding sleeve (26), in point, sliding sleeve (26) is fixed on point middle frame (38), in point, slide bar (40) upper end is provided with vertical tooth rack (44), point middle frame (38) of vertical tooth rack (44) both sides is provided with two points of middle gears (42), vertical tooth rack (44) engages with two points of middle gears (42), in point, the top of frame (38) is provided with two points of middle racks (43), two points of middle racks (43) are engaged with two points of middle gears (42) respectively, the outer end of middle rack (43) is divided to be fixed with a point middle block (41).

7. rear axle of passenger vehicle shell spot welding hydraulic tool according to claim 1, it is characterized in that: described levelling gear (7) comprises upper and lower two levelling devices and leveling cyclinder (45), two levelling device structures are identical, comprise leveling bar (46), leveling gear (47), leveling tooth bar (48) and leveling lugs (49), leveling bar (46) lower end is connected with leveling tooth bar (48), leveling tooth bar (48) is connected with the plunger of leveling cyclinder (45), leveling cyclinder (45) is connected with mobile vehicle (3), leveling tooth bar (48) and leveling gear (47) engage each other, leveling gear (47) is arranged in leveling lugs (49), and the leveling gear (47) of upper and lower two levelling devices is separately positioned on the two ends of connecting rod (50), the end face of the leveling bar (46) of upper and lower two levelling devices is on same horizontal plane.