CN220006489U

CN220006489U - Special annular seam machine for half axle sleeve of rear axle housing

Info

Publication number: CN220006489U
Application number: CN202321372269.3U
Authority: CN
Inventors: 桑俊波
Original assignee: Zhengzhou Kaibo Welding And Cutting Equipment Co ltd
Current assignee: Zhengzhou Kaibo Welding And Cutting Equipment Co ltd
Priority date: 2023-05-31
Filing date: 2023-05-31
Publication date: 2023-11-14
Anticipated expiration: 2033-05-31

Abstract

The utility model provides a special machine for circumferential seams of half axle sleeves of rear axle housings, which belongs to the technical field of axle housing welding, and comprises a frame, wherein a shell is further arranged on the frame so as to prevent welding smoke dust from diffusing; the welding mechanism is arranged on the shell and is used for carrying out girth welding on the workpiece; further comprises: the clamping rotating mechanism is arranged below the welding mechanism, clamps the two ends of the workpiece through the two ends, fixes the two ends of the workpiece, and drives the workpiece to rotate so as to realize girth welding in cooperation with the welding mechanism; the utility model can realize full-automatic girth welding of the rear axle housing and improve the welding efficiency of the axle housing. In addition, the device does not adopt precise parts such as a mechanical arm and the like, so that the manufacturing cost of the device is reduced, and the practicability is improved; the welding effect is stable, the axle housing workpiece is driven to rotate by the clamping rotating mechanism, the whole welding process is free of vibration or shaking, and the girth welding effect is improved.

Description

Special annular seam machine for half axle sleeve of rear axle housing

Technical Field

The utility model relates to the technical field of axle housing welding, in particular to a special annular seam machine for a half axle sleeve of a rear axle housing.

Background

The automobile rear axle housing assembly is a basic part for installing a main speed reducer, a differential mechanism, a half shaft, a hub and a suspension, and has the main function of supporting and protecting parts such as the main speed reducer, the differential mechanism and the half shaft, and the like, and the automobile rear axle housing assembly is required to have enough strength and rigidity so as to ensure the normal running of an automobile. In the production process of the rear axle housing assembly, the welding quality is the key for determining the quality of the rear axle housing assembly, and the girth welding quality between the half axle sleeve and the axle housing is particularly key.

At present, rear axle housing welding is classified into full-automatic welding and semi-automatic welding. The semi-automatic welding is to fix the workpiece on the fixture, and then to weld the workpiece manually, the welding mode has low cost, but the welding efficiency, the welding effect and the like are low, and the semi-automatic welding is only suitable for being used in a small amount of processing. The full-automatic welding equipment has high processing efficiency, does not need manual intervention, and saves manpower. However, the full-automatic welding equipment mostly adopts mechanical arms, and the requirements on assembly precision and positioning precision are high, so that the equipment cost is high.

The utility model patent with the publication number of CN207930245U discloses a double-ring seam welding device for rear axle housing assembly production, the scheme is characterized in that the positions of welding guns are adjusted through an axial adjusting device, a radial adjusting device and a welding gun adjusting device on a welding unit, so that the welding guns on two sides and a weldment are kept at the optimal angle at the same time, a workpiece rotating mechanism is controlled to rotate through a control panel, the welding process is started, two ring seams can be welded at the same time, and the welding gun and the weldment are ensured to be uniform due to the fact that the positions and the angles of the welding guns and the weldment are fixed, and the welding efficiency is improved. The disclosure uses a manually adjustable welding unit instead of an existing mechanical arm to reduce the manufacturing cost of the welding apparatus.

However, this publication also has some problems: firstly, when placing the axle housing work piece at every turn, because the axle housing is heavier, need place from top to bottom with the help of lifting means, consequently need rotate welding unit to other directions earlier, form to dodge in order to conveniently place the axle housing, this just leads to all needing manual adjustment welding unit's position when welding at every turn to the corresponding problem of accurate adjustment is comparatively troublesome. Secondly, the axle housing is firstly placed on the workpiece supporting device, namely the V-shaped groove, and then the axle housing is rotated by the two rotating mechanism control devices, when the rotating mechanism control devices drive the axle housing to rotate, the axle housing rubs with the V-shaped groove, so that the surface of the axle housing is easy to wear, the axle housing is continuously contacted with the V-shaped groove in the rotating process, the axle housing can shake, and the welding effect is influenced.

Disclosure of Invention

The utility model provides a special machine for girth welding of a half axle sleeve of a rear axle housing, which aims to solve the technical problem of poor girth welding effect of the axle housing in the prior art.

In order to solve the problems, the special rear axle housing half axle sleeve circumferential seam machine provided by the utility model adopts the following technical scheme: comprises a frame, wherein a shell is arranged on the frame to avoid the diffusion of welding fume; the welding mechanism is arranged on the shell and is used for carrying out girth welding on the workpiece; further comprises: the clamping rotating mechanism is arranged below the welding mechanism, clamps the two ends of the workpiece through the two ends, fixes the two ends of the workpiece, and drives the workpiece to rotate so as to realize girth welding in cooperation with the welding mechanism; the conveying platform is arranged between the clamping rotating mechanisms and is used for conveying the workpiece to the lower part of the welding mechanism, and the conveying direction of the conveying platform is defined as the front-rear direction; and the lifting mechanism is arranged at the bottom of the conveying platform and used for driving the conveying platform to lift, so that the lifting mechanism drives the conveying platform to descend when the workpiece is fastened, and the workpiece is separated from the conveying platform.

As a further improvement, the lifting mechanism comprises lifting structures which are arranged on the front side and the rear side of the frame and used for driving the conveying platform to lift, so that the lifting stability of the conveying platform is improved.

As a further improvement, two linkage frames are rotatably assembled on the frame, the two linkage frames are respectively arranged on the front side and the rear side of the frame, each linkage frame comprises two vertical rods fixedly connected with each other, an included angle is formed between the two vertical rods, one end of each linkage frame is hinged with a connecting shaft, the other end of each connecting shaft is hinged with the conveying platform, the conveying platform is enabled to ascend and then drive the linkage frames to rotate, and a linkage shaft is hinged between the two linkage frames so as to ensure that the front end and the rear end of the conveying platform are lifted synchronously.

As a further improvement, the side of the lifting structure is also provided with a vertical guide rod, a sliding block is arranged on the frame, the vertical guide rod is slidingly assembled on the sliding block to improve lifting stability, and the vertical guide rod is connected with the conveying platform.

As a further improvement, the conveying platform comprises a base, a horizontal guide rod extending along the front-back direction is arranged on the base, a bearing table is connected to the horizontal guide rod in a sliding mode, a V-shaped groove for placing a workpiece is arranged on the bearing table, and a rodless cylinder connected with the bearing table is further arranged on the base and drives the base to slide so as to realize workpiece conveying.

As a further improvement, the clamping and rotating mechanism comprises bearing plates arranged on two sides of the conveying platform, a driving mechanism for driving the workpiece to rotate is slidably arranged on the bearing plates, and a telescopic structure for driving the driving mechanism to slide is further arranged on the bearing plates, and the telescopic mechanism drives the driving mechanism to move so as to clamp the workpiece.

As a further improvement, the driving mechanism comprises a bottom plate which is assembled on a bearing plate in a sliding way, a bearing box is arranged on the bottom plate, a bearing shaft is assembled on the bearing box in a rotating way along the left-right direction, a clamping block is arranged at one end, close to a conveying platform, of the bearing shaft, a driven wheel is arranged at the other end of the bearing shaft, and a motor for driving the driven wheel to rotate is further arranged on the bearing box.

As a further improvement, the bearing plate is also provided with a bracket for adjusting the height of the telescopic structure, one end of the bearing box, which is close to the telescopic structure, is provided with a protective shell for protecting the driven wheel and the motor, and the telescopic structure is connected with the protective shell to drive the driving mechanism to move.

As a further improvement, the bearing plate is slidingly and rotationally arranged on the frame, a distance adjusting structure for adjusting the position of the bearing box is further arranged at the bottom of the bearing plate, the distance adjusting structure comprises a screw rod arranged below the bearing plate, the screw rod is rotationally assembled on the frame, an adjusting nut is connected to the screw rod in a threaded manner, and the adjusting nut is connected with the bearing plate so that the screw rod drives the bearing plate to move after rotating.

As a further improvement, a handle is connected to the screw rod so as to manually drive the screw rod to adjust the interval of the clamping and rotating mechanism.

The technical scheme of the utility model has the following beneficial effects:

1. the device can realize full-automatic girth welding of the rear axle housing, and improves the welding efficiency of the axle housing. In addition, the device does not adopt precise parts such as a mechanical arm, so that the manufacturing cost of the device is reduced, and the practicability is improved.

2. The welding effect is stable, the axle housing workpiece is driven to rotate by the clamping rotating mechanism, the whole welding process is free of vibration or shaking, and the girth welding effect is improved.

3. The adaptability is strong and is improved, axle housing workpieces with different lengths can be adapted by adjusting the interval of the clamping rotating mechanism, and axle housing workpieces with different diameters can be adapted by adjusting the height of the lifting mechanism, so that the adaptability of the device is improved.

4. The device has good running stability, and a linkage structure is arranged between two lifting cylinders of the lifting mechanism, so that synchronous lifting of the front end and the rear end of the lifting mechanism is ensured, and asynchronous lifting caused by deviation of the two lifting cylinders is avoided, so that lifting of axle housing workpieces is influenced.

Drawings

The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present utility model will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. In the drawings, embodiments of the utility model are illustrated by way of example and not by way of limitation, and like reference numerals refer to similar or corresponding parts and in which:

FIG. 1 is a schematic diagram of a front view structure of a special machine for circumferential seams of half axle sleeves of rear axle housings;

FIG. 2 is a left side view structure schematic diagram of a special machine for circumferential seam of a half axle sleeve of a rear axle housing;

FIG. 3 is a schematic top view of a special rear axle housing half-axle sleeve girth machine;

FIG. 4 is a schematic structural view of a lifting mechanism of the rear axle housing half-axle sleeve girth special machine;

FIG. 5 is a schematic structural view of a conveying platform of the rear axle housing half-axle sleeve girth special machine;

FIG. 6 is a schematic structural view of a clamping and rotating mechanism of a special rear axle housing half-axle sleeve girth machine of the present utility model;

fig. 7 is a schematic structural view of a clamping and rotating mechanism in embodiment 2.

Reference numerals illustrate:

1. a frame; 11. a housing; 2. a spacing adjustment mechanism; 21. a handle; 22. a screw rod; 23. an adjusting nut; 3. a clamping rotation mechanism; 31. a bracket; 32. a bottom plate; 33. a clamping cylinder; 34. driven wheel; 35. a load carrying box; 36. a bearing shaft; 37. a clamping block; 38. a bearing plate; 4. a welding mechanism; 5. a workpiece; 6. a conveying platform; 61. a base; 62. a horizontal guide bar; 63. a bearing table; 64. a V-shaped groove; 65. a rodless cylinder; 7. a lifting mechanism; 71. a vertical guide bar; 72. a slide block; 73. a connecting shaft; 74. a linkage frame; 75. a linkage shaft; 76. lifting cylinder.

Detailed Description

The following description of the embodiments of the present utility model will be made more complete and clear to those skilled in the art by reference to the figures of the embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the prior art, the girth welding fixture of the axle housing is low in welding efficiency, and the welding effect is unstable due to the fact that the axle housing is possibly vibrated or rocked. To above-mentioned problem, this device has realized full-automatic girth welding of axle housing through setting up delivery platform, elevating system, clamp rotary mechanism etc to improved axle housing girth welding's efficiency by a wide margin, and through increasing the linkage structure to elevating system, ensure that elevating system still can keep steady operation when promoting the great axle housing of weight.

During welding, the axle housing is lifted to the V-shaped groove through external lifting equipment, the rodless cylinder drives the bearing platform machine work piece to move backwards to the inside of the machine shell, and when the work piece moves to the lower part of the welding mechanism, the rodless cylinder stops moving. The lifting cylinder is started to drive the conveying platform to rise, and when the conveying platform rises, the connecting shaft is driven to rise, and the connecting shaft drives the linkage frame to rotate. And after the workpiece rises to the set position, the operation is stopped, the two telescopic structures push the driving mechanism to integrally move, the workpiece is clamped, and then the conveying platform descends. Then, the motor drives the driven wheel to rotate through the transmission belt to drive the bearing shaft to rotate, so that the axle housing workpiece rotates, and the welding mechanism is started to weld the girth.

Having described the basic principles of the present utility model, various non-limiting embodiments of the utility model are described in detail below. Any number of elements in the figures are for illustration and not limitation, and any naming is used for distinction only and not for any limiting sense.

The principles and spirit of the present utility model are explained in detail below with reference to several representative embodiments thereof.

The utility model provides an embodiment 1 of a special annular seam machine for a half axle sleeve of a rear axle housing, which comprises the following steps:

as shown in fig. 1-6, the device comprises a shell 11, wherein the shell 11 plays a role in protecting, so that residues and the like are prevented from splashing in the welding process, and meanwhile, the residues are convenient to collect and smoke dust is convenient to process; a frame 1 for bearing is also installed in the housing 11, and the frame 1 also extends to the outside of the housing 11.

As shown in fig. 1-3, a welding mechanism 4 is installed on a casing 11, and is installed on the casing 11 and used for welding axle housings, the welding mechanism 4 comprises a mounting rack installed on the casing 11, two groups of welding gun adjusting frames are installed on the mounting rack, welding guns are fixed on the welding gun adjusting frames, the positions of the two welding guns respectively correspond to the positions of girth welding, the welding gun adjusting frames can adjust the positions of the welding guns in the left-right direction and the up-down direction, and the welding gun adjusting frames are of the prior art and are not repeated herein;

as shown in fig. 1, 4 and 5, a lifting mechanism 7 is mounted on the frame 1 to drive the conveying platform 6 to lift. The lifting mechanism 7 includes a lifting structure installed at the front and rear sides of the frame 1 for driving the conveying platform 6 to lift, so as to improve the lifting stability of the conveying platform 6, and in this embodiment, the lifting structure is a lifting cylinder 76. The left and right sides face of lift cylinder 76 still is equipped with vertical guide bar 71, installs slider 72 on the frame 1, and vertical guide bar 71 sliding fit is on slider 72 in order to improve lift stability, and vertical guide bar 71 is connected with conveying platform 6. The frame 1 is further rotatably provided with two L-shaped linkage frames 74, and the two linkage frames 74 are respectively rotatably connected to the front side and the rear side of the frame 1, and in other embodiments, V-shaped linkage frames 74 may be also used. One end of the linkage frame 74 is hinged with a connecting shaft 73, the other end of the connecting shaft 73 is hinged with the conveying platform 6, the linkage frame 74 is driven to rotate after the conveying platform 6 ascends, and a linkage shaft 75 is hinged between the two linkage frames 74 to ensure that the front end and the rear end of the conveying platform 6 synchronously ascend and descend. In this way, the lifting mechanism 7 is lifted synchronously front and back, so that the problems of inclination of the conveying platform 6 and abrasion caused by friction force due to the fact that the lifting of the two lifting cylinders 76 is asynchronous are avoided, and the service life and the lifting stability of the lifting mechanism 7 are improved.

As shown in fig. 1, 4 and 5, a conveying platform 6 is mounted on top of the lifting mechanism 7, and the conveying platform 6 extends to the outside of the casing 11 for conveying the workpiece 5 to below the welding mechanism 4. The conveying platform 6 comprises a base 61 connected with a lifting cylinder 76, two horizontal guide rods 62 extending along the front-rear direction are arranged on the base 61, a bearing table 63 is connected to the horizontal guide rods 62 in a sliding mode, a V-shaped groove 64 for placing the workpiece 5 is arranged on the bearing table 63, a rodless cylinder 65 connected with the bearing table 63 is further arranged on the base 61, and the rodless cylinder 65 drives the base 61 to slide so as to convey the workpiece 5.

As shown in fig. 1 and 6, the two sides of the conveying platform 6 are also provided with clamping and rotating mechanisms 3 installed on the frame 1, the clamping and rotating mechanisms 3 are installed below the welding mechanism 4, the clamping and rotating mechanisms 3 clamp and fix two ends of the workpiece 5 through two ends and drive the workpiece 5 to rotate so as to match the welding mechanism 4 to realize girth welding.

The clamping and rotating mechanism 3 comprises bearing plates 38 arranged on two sides of the conveying platform 6, a driving mechanism for driving the workpiece 5 to rotate is slidably arranged on the bearing plates 38, and a telescopic structure for driving the driving mechanism to slide is further arranged on the bearing plates 38, in the embodiment, the telescopic mechanism is a clamping cylinder 33, and the clamping cylinder 33 drives the driving mechanism to integrally move so as to clamp the workpiece 5.

The driving mechanism comprises a bottom plate 32 which is slidably assembled on a bearing plate 38, a bearing box 35 is installed on the bottom plate 32, a bearing shaft 36 is rotatably assembled on the bearing box 35 along the left-right direction, a clamping block 37 is installed at one end of the bearing shaft 36, which is close to the conveying platform 6, and the clamping block 37 is of a conical structure, so that even if the axle housing workpiece 5 deviates in the horizontal direction or the vertical direction, the clamping block 37 of the conical structure can fix the workpiece 5. The driven wheel 34 is installed to the other end of bearing shaft 36, still installs the motor that is used for driving driven wheel 34 pivoted on the bearing box 35, installs the action wheel on the motor, and the action wheel passes through the drive belt with driven wheel 34 to be connected, and the diameter of action wheel is less than driven wheel 34 diameter, and the motor can adopt gear motor, avoids work piece 5 rotational speed to influence welding effect too soon.

The mode that the clamping cylinder 33 promotes the whole removal of driving the mechanism of turning is adopted in this scheme, realizes that work piece 5 presss from both sides tightly, need not complicated cooperation mechanism like this, and the processing degree of difficulty of each part is lower relatively, overhauls conveniently.

The bearing plate 38 slides and rotates on the frame 1, and bearing plate 38 bottom still is equipped with the interval adjustment structure that is used for adjusting the bearing box 35 position, interval adjustment structure is including setting up the lead screw in bearing plate 38 below, the lead screw rotates the assembly on frame 1, and threaded connection has adjusting nut 23 on the lead screw, and adjusting nut 23 is connected with bearing plate 38 to drive bearing plate 38 after making the lead screw rotate and remove. In this embodiment, a handle 21 is connected to the screw to manually drive the screw to adjust the pitch of the clamping and rotating mechanism 3.

Other conventional components such as the controller are all in the prior art, and are not described herein.

The utility model provides an embodiment 2 of a special machine for circumferential seams of half axle sleeves of rear axle housings, which comprises the following steps:

the differences from example 1 are mainly that:

in embodiment 1, the clamping and rotating mechanism comprises bearing plates arranged on two sides of the conveying platform, a driving mechanism for driving the workpiece to rotate is slidably arranged on the bearing plates, and a telescopic structure for driving the driving mechanism to slide is further arranged on the bearing plates.

The driving mechanism comprises a bottom plate which is assembled on the bearing plate in a sliding manner, a bearing box is installed on the bottom plate, a bearing shaft is assembled on the bearing box in a rotating manner along the left-right direction, a clamping block is installed at one end, close to the conveying platform, of the bearing shaft, the clamping block is of a conical structure, and therefore even if an axle housing workpiece has deviation in the horizontal direction or the vertical direction, the clamping block of the conical structure can fix the workpiece. The other end of the bearing shaft is provided with a driven wheel, the bearing box is also provided with a motor for driving the driven wheel to rotate, the motor is provided with a driving wheel, and the driving wheel is connected with the driven wheel through a transmission belt.

As shown in fig. 7, in this embodiment, the clamping and rotating mechanism includes two bearing boxes disposed on two sides of the conveying platform, a bearing shaft disposed along a left-right direction is rotatably assembled in the bearing boxes, a sliding shaft capable of sliding along the left-right direction is disposed at one end of the bearing shaft, which is close to the conveying platform, the sliding shaft extends to the outside of the bearing block and is connected with the clamping block, a limiting shaft for preventing the sliding shaft from rotating along a circumferential direction is further disposed in the bearing shaft, an inner shaft is disposed in the limiting shaft, and the inner shaft is rotatably connected with the sliding shaft.

The bearing box is also provided with a clamping cylinder, the telescopic shaft of the clamping cylinder extends into the bearing shaft and is connected with the inner shaft so as to drive the sliding shaft to move left and right through the clamping cylinder, and the bearing box is also provided with a driving mechanism for driving the bearing shaft to rotate.

The driving mechanism comprises a motor arranged on the bearing box, a worm is connected to an output shaft of the motor, a turbine matched with the worm is arranged on the bearing shaft, and the motor is meshed with the worm through the turbine to drive the bearing shaft to rotate.

In this embodiment, the clamping rotation mechanism is smaller, because the axle housing work piece is longer relatively, leads to current girth welding set length great in the left and right directions, occupation space is big, and this embodiment is more suitable for the use under the limited circumstances of workshop space.

The utility model provides an embodiment 3 of a special annular seam machine for a half axle sleeve of a rear axle housing, which comprises the following steps:

the differences from example 1 are mainly that:

in embodiment 1, the conveying platform includes the base of being connected with the lift cylinder, installs two horizontal guide bars that extend along fore-and-aft direction on the base, and sliding connection has the bearing platform on the horizontal guide bar, installs the V type groove that is used for placing the work piece on the bearing platform, still installs the rodless cylinder of being connected with the bearing platform on the base, and rodless cylinder drive base slides in order to realize the work piece and carries.

In this embodiment, the ball screw structure is used instead of the rodless cylinder to drive the bearing table to convey the workpiece, and the ball screw structure has higher precision, but relatively higher cost.

The utility model provides an embodiment 4 of a special annular seam machine for a half axle sleeve of a rear axle housing, which comprises the following steps:

the differences from example 1 are mainly that:

in embodiment 1, a handle is connected to the screw to manually drive the screw to adjust the pitch of the clamping and rotating mechanism.

In this embodiment, no longer set up the lead screw, set up a plurality of spacing holes in the frame, the bearing plate passes through the bolt and is connected with spacing hole cooperation to realize the fixed of bearing plate, when adjusting the interval, remove the bolt, promote the bearing plate and remove to the settlement position, later pass through the bolt and be connected with the spacing hole cooperation of corresponding position.

While various embodiments of the present utility model have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Many modifications, changes, and substitutions will now occur to those skilled in the art without departing from the spirit and scope of the utility model. It should be understood that various alternatives to the embodiments of the utility model described herein may be employed in practicing the utility model. The appended claims are intended to define the scope of the utility model and are therefore to cover all module forms, equivalents, or alternatives falling within the scope of the claims.

Claims

1. Rear axle housing semi-axis sleeve pipe girth special plane includes:

the welding machine comprises a frame (1), wherein a shell (11) is further arranged on the frame (1) so as to prevent welding smoke dust from diffusing;

a welding mechanism (4) which is mounted on the casing (11) and is used for carrying out girth welding on the workpiece (5);

characterized by further comprising:

the clamping and rotating mechanism (3) is arranged below the welding mechanism (4), the clamping and rotating mechanism (3) is used for fixing two ends of the workpiece (5) through clamping at two ends and driving the workpiece (5) to rotate so as to realize girth welding in cooperation with the welding mechanism (4);

a conveying platform (6) which is arranged between the clamping and rotating mechanisms (3) and is used for conveying the workpiece (5) to the lower part of the welding mechanism (4), and the conveying direction of the conveying platform (6) is defined as the front-back direction;

and the lifting mechanism (7) is arranged at the bottom of the conveying platform (6) and used for driving the conveying platform (6) to lift so that the workpiece (5) is driven by the lifting mechanism (7) to descend when the fastening is completed, and the workpiece (5) is separated from the conveying platform (6).

2. The rear axle housing half axle sleeve girth special machine of claim 1, wherein: the lifting mechanism (7) comprises lifting structures which are arranged on the front side and the rear side of the frame (1) and used for driving the conveying platform (6) to lift, so that the lifting stability of the conveying platform (6) is improved.

3. The rear axle housing half axle sleeve girth special machine according to claim 2, wherein: the frame (1) is further rotationally provided with two linkage frames (74), the two linkage frames (74) are respectively arranged on the front side and the rear side of the frame (1), each linkage frame (74) comprises two vertical rods fixedly connected with each other, an included angle is formed between the two vertical rods, one end of each linkage frame (74) is hinged with a connecting shaft (73), the other end of each connecting shaft (73) is hinged with the conveying platform (6), the conveying platform (6) is enabled to ascend and then drive the linkage frames (74) to rotate, and a linkage shaft (75) is hinged between the two linkage frames (74) so as to ensure that the front end and the rear end of the conveying platform (6) are synchronously lifted.

4. The rear axle housing half axle sleeve girth special machine of claim 3, wherein: the side of elevation structure still is equipped with vertical guide bar (71), installs slider (72) on frame (1), and vertical guide bar (71) sliding fit is on slider (72) in order to improve the stability of going up and down, vertical guide bar (71) are connected with conveying platform (6).

5. The rear axle housing half axle sleeve girth special machine of claim 1, wherein: the conveying platform (6) comprises a base (61), a horizontal guide rod (62) extending along the front-rear direction is arranged on the base (61), a bearing table (63) is connected to the horizontal guide rod (62) in a sliding mode, a V-shaped groove (64) for accommodating a workpiece (5) is arranged on the bearing table (63), a rodless cylinder (65) connected with the bearing table (63) is further arranged on the base (61), and the rodless cylinder (65) drives the base (61) to slide so as to convey the workpiece (5).

6. The rear axle housing half axle sleeve girth special machine of claim 1, wherein: the clamping and rotating mechanism (3) comprises bearing plates (38) arranged on two sides of the conveying platform (6), a driving mechanism used for driving the workpiece (5) to rotate is slidably assembled on the bearing plates (38), and a telescopic structure used for driving the driving mechanism to slide is further installed on the bearing plates (38), and the telescopic mechanism drives the driving mechanism to move so as to clamp the workpiece (5).

7. The rear axle housing half axle sleeve girth special machine of claim 6, wherein: the driving mechanism comprises a bottom plate (32) which is slidably assembled on a bearing plate (38), a bearing box (35) is installed on the bottom plate (32), a bearing shaft (36) is rotatably assembled on the bearing box (35) along the left-right direction, a clamping block (37) is installed at one end, close to a conveying platform (6), of the bearing shaft (36), a driven wheel (34) is installed at the other end of the bearing shaft (36), and a motor for driving the driven wheel (34) to rotate is further installed on the bearing box (35).

8. The rear axle housing half axle sleeve girth special machine of claim 7, wherein: the bearing plate (38) is further provided with a support (31) for adjusting the height of the telescopic structure, one end, close to the telescopic structure, of the bearing box (35) is provided with a protective shell for protecting the driven wheel (34) and the motor, and the telescopic structure is connected with the protective shell to drive the driving mechanism to move.

9. The rear axle housing half-axle sleeve girth special machine according to any one of claims 6 to 8, wherein: the bearing plate (38) is slidingly and rotatably arranged on the frame (1), a distance adjusting structure for adjusting the position of the bearing box (35) is further arranged at the bottom of the bearing plate (38), the distance adjusting structure comprises a screw rod arranged below the bearing plate (38), the screw rod is rotationally assembled on the frame (1), an adjusting nut (23) is connected to the screw rod in a threaded manner, and the adjusting nut (23) is connected with the bearing plate (38) so that the screw rod drives the bearing plate (38) to move after rotating.

10. The rear axle housing half axle sleeve girth special machine of claim 9, wherein: the screw is connected with a handle (21) so as to manually drive the screw to adjust the interval of the clamping and rotating mechanism (3).