CN214621110U - Coaxiality adjusting device - Google Patents

Abstract

The utility model provides a coaxiality adjusting device, which comprises a first fixing part and a second fixing part, wherein two ends of a workpiece to be adjusted are coaxially arranged on the first fixing part and the second fixing part respectively, and the workpiece can rotate around an axis; the coaxiality adjusting device further comprises a measuring part and an adjusting part, wherein the measuring part can measure the offset of the measured position in the rotating process of the workpiece, and the adjusting part can adjust the coaxiality of the workpiece according to the offset. By adopting the structure, the workpiece can be arranged between the first fixing part and the second fixing part, the workpiece is rotated, the measuring part can measure the offset of the workpiece at the measuring position, and then a worker can adjust the coaxiality of the workpiece according to the offset. When measuring the offset, the work piece is installed between first fixed part and second fixed part, and measurement accuracy is higher, and when the adjustment, need not to remove the work piece repeatedly, the adjustment efficiency is higher.

Description

Coaxiality adjusting device

Technical Field

The utility model relates to an automobile body part preparation technical field, concretely relates to axiality adjusting device.

Background

In the trial-manufacturing process of the sample vehicle, part of parts of the vehicle body are manufactured by being disassembled and combined from the existing parts, and the structure, the size and the like of the corresponding parts need to be modified to meet the use requirement due to the change of the model parameters and the like of the sample vehicle.

The half shaft of a sample car needs to be matched with the spline and the contour flange of a new differential of the sample car again, two different half shafts are usually adopted for remanufacturing, one part of each half shaft is cut out, the spline end and the flange end of the two half shafts are respectively used, and then the spline end and the flange end are welded through a sleeve to be changed into a new half shaft.

In the prior art, two V-shaped grooves are usually adopted to support two ends of a new half shaft, the half shaft is rotated, the offset of a welding position is measured at the middle position of the half shaft, a worker moves the half shaft to adjusting equipment according to the offset to adjust the half shaft, the operation is repeated for many times, the new half shaft is only placed on the V-shaped groove when the offset is measured, clamping and positioning are not needed, the offset measurement precision is low, the worker needs to repeatedly move the half shaft between the measuring equipment and the adjusting equipment when the offset is measured, the adjustment efficiency is low, and the labor cost is indirectly increased.

Therefore, it is an urgent technical problem to be solved by those skilled in the art to provide a coaxiality adjusting device capable of adjusting the coaxiality of the half shafts with high precision and high efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a axiality adjusting device can adjust the semi-axis axiality high accuracy, high efficiency.

In order to solve the above technical problem, the present invention provides a coaxiality adjusting apparatus, which includes a first fixing portion and a second fixing portion, wherein two ends of a workpiece to be adjusted are coaxially mounted on the first fixing portion and the second fixing portion, respectively, and the workpiece can rotate around an axis; the coaxiality adjusting device further comprises a measuring part and an adjusting part, wherein the measuring part can measure the offset of the measured position in the rotating process of the workpiece, and the adjusting part can adjust the coaxiality of the workpiece according to the offset.

By adopting the structure, the workpiece can be arranged between the first fixing part and the second fixing part, the workpiece is rotated, the measuring part can measure the offset of the workpiece at the measuring position, and then a worker can adjust the coaxiality of the workpiece according to the offset. When measuring the offset, the work piece is installed between first fixed part and second fixed part, and measurement accuracy is higher, and when the adjustment, need not to remove the work piece repeatedly, the adjustment efficiency is higher.

Optionally, the first fixing portion includes a base, a fixing member and a rotating assembly, the fixing member and the rotating assembly are mounted on the base, the fixing member can be fixed to one end of the workpiece, and the rotating assembly can drive the fixing member to rotate.

Optionally, the first fixing portion further comprises a connecting shaft, the base is provided with a through hole, the connecting shaft can penetrate through the through hole, and the fixing member and the rotating assembly are respectively fixed at two ends of the connecting shaft.

Optionally, the fixing member is a chuck, and the chuck can clamp and fix one end of the workpiece.

Optionally, the rotating assembly includes a driving portion and a bearing, the bearing is disposed inside the through hole, the connecting shaft is sleeved with the bearing, and the driving portion can drive the connecting shaft to rotate around the axis through the bearing.

Optionally, the first fixing portion further comprises a bearing fixing ring, a step surface is arranged on one side inside the through hole, and the bearing fixing ring and the step surface can limit the bearing inside the through hole.

Optionally, the second fixing portion includes a base, a thimble and a push rod, the base is provided with a sleeve, the thimble is capable of being mounted at a front end of an inner hole of the sleeve, the push rod is capable of being mounted at a rear end of the inner hole, and both the thimble and the push rod are capable of moving in the inner hole; the push ejector rod can push the ejector pin to move towards the front end of the sleeve, so that the ejector pin tightly pushes and fixes one end of the workpiece.

Optionally, the second fixing portion further includes a locking screw, the locking screw penetrates through a wall of the sleeve, and the locking screw can abut against a circumferential wall of the thimble to lock the thimble so that the thimble is relatively fixed to the sleeve.

Optionally, the base includes a fixed bottom plate and a movable base which are matched, and the sleeve is installed or integrally arranged on the movable base; the movable base can slide on the fixed bottom plate along the axial direction and can be locked with the fixed bottom plate.

Optionally, the workpiece is a half shaft, and the half shaft comprises a first half shaft section and a second half shaft section which are connected through a sleeve and fixed by welding; the thimble can push into the terminal surface centre bore of the flange end of second semi-axis section, first fixed part can fix the spline end of first semi-axis section, measuring part can be in the semi-axis rotation in-process measures the offset of sleeve pipe position.

Alternatively, the measuring unit and the adjusting unit may be located above and below the workpiece, or below and above the workpiece, respectively.

Optionally, the measuring part is a height gauge; and/or the adjusting part is a jack.

Drawings

Fig. 1 is a schematic structural diagram of a coaxiality adjusting device according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of the first fixing portion in FIG. 1;

fig. 3 is an exploded view of the first fixing part of fig. 2;

FIG. 4 is a schematic cross-sectional view of FIG. 2;

FIG. 5 is a schematic structural view of the second fixing portion in FIG. 1;

FIG. 6 is a schematic cross-sectional view of the workpiece of FIG. 1 during alignment for concentricity;

fig. 7 is a schematic view of the structure of the workpiece of fig. 1.

The reference numerals in fig. 1-7 are illustrated as follows:

1 a first fixing part, 11 a base, 111 a through hole, 112 a step surface, 12 a fixing part, 121 a claw,

13 rotating components, 131 driving parts, 132 bearings, 14 connecting shafts, 141 bearing retainer rings, 15 bearing retainer rings, 2 second fixing parts, 21 fixing bottom plates, 211 sliding rails, 212 bolt holes, 22 moving bases, 221 sleeves, 222 sliding blocks, 23 ejector pins, 24 pushing ejector rods, 25 locking screws, 26 fixing bolts, 3 measuring parts, 4 adjusting parts, 5 workpieces, 51 spline ends, 52 flange ends, 53 sleeves and 6 working tables.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a coaxiality adjusting device according to an embodiment of the present invention.

The embodiment of the utility model provides a axiality adjusting device, including first fixed part 1 and second fixed part 2, the work piece 5 both ends of waiting to adjust are installed at the two coaxially respectively to the work piece 5 can rotate around the axis, namely rotate around the axis of "coaxial" here; the present embodiment further includes a measuring unit 3 and an adjusting unit 4, the measuring unit 3 can measure the offset amount of the measured position during the rotation of the workpiece 5, and the adjusting unit 4 can adjust the coaxiality of the workpiece 5 according to the offset amount, which obviously refers to the offset amount with respect to the axis.

With the above configuration, the workpiece 5 can be mounted between the first fixing section 1 and the second fixing section 2, since both ends of the workpiece 5 are coaxial, when the workpiece 5 to be adjusted rotates, if there is a portion of the workpiece 5 that is not coaxial with both ends, the portion that is not coaxial deviates from the axis, during the rotation, the measuring section 3 can measure the amount of deviation at the corresponding measurement position, and the adjusting section 4 can adjust the coaxiality of the workpiece 5 according to the measured amount of deviation. For example, the measuring section 3 may be adjusted to a predetermined position where the measuring section 3 and the workpiece 5 have a predetermined distance when the coaxiality satisfies the theoretical requirement, and when there is a deviation in the measuring position rotated to the measuring section 3, the distance measured by the measuring section 3 from the measuring position is deviated from the predetermined distance, which is a deviation amount, and the adjusting section 4 may adjust the workpiece 5 accordingly to cancel the deviation amount. Alternatively, as described below, the coaxiality adjustment is performed in such a manner that the lowest point or the highest point is measured and the adjustment is reversed a plurality of times during the rotation.

As shown in fig. 1, the present embodiment may further include a workbench 6, the workbench 6 is formed by welding a bottom plate and a plurality of square tubes, the square tubes serve as a support supporting bottom plate, and the first fixing portion 1, the second fixing portion 2, the measuring portion 3 and the adjusting portion 4 are all disposed on the workbench 6, so as to facilitate the operation of the worker. The workbench 6 with the structure has simple structure and low cost. The table top of the table 6 should be flat to ensure accuracy of the coaxiality adjustment.

When the coaxiality of the workpiece 5 to be adjusted is adjusted, the workpiece 5 is always arranged between the first fixing part 1 and the second fixing part 2, two ends of the workpiece 5 are always in a coaxial arrangement state, the coaxiality of the two ends of the workpiece 5 can be ensured by ensuring that the installation positions of the first fixing part 1 and the second fixing part 2 are coaxial, and the installed workpiece 5 cannot move except for self rotation, so that the offset measured by the measuring part 3 is more accurate; after the offset is measured, the coaxiality of the workpiece 5 can be adjusted by the adjusting part 4, and the measurement and adjustment processes are repeated for a plurality of times until the whole workpiece 5 tends to be coaxial.

This embodiment can measure and adjust work piece 5 in succession, and whole in-process work piece 5 need not to remove, only needs a staff can accomplish the adjustment work, and the axiality adjustment efficiency is higher, has indirectly reduced the cost of labor.

In addition, the selected workbench 6 bears each component in the embodiment, so as to improve the level of each component, thereby facilitating the operation of workers, and in practical application, the structure and material of the workbench 6 can be freely adjusted according to the actual situation, which is not limited by the utility model; of course, the work table 6 may not be provided, and each member may be mounted on the upper end of another device, and may also serve to facilitate the operation of the worker, as long as it is ensured that both ends of the workpiece 5 can be coaxially fixed to the first fixing portion 1 and the second fixing portion 2, respectively, and the first fixing portion 1 and the second fixing portion 2 do not move during the coaxiality adjustment.

Referring to fig. 2-4, fig. 2 is a schematic structural view of the first fixing portion in fig. 1; fig. 3 is an exploded view of the first fixing part of fig. 2; fig. 4 is a schematic cross-sectional structure of fig. 2.

In this embodiment, the first fixing portion 1 includes a base 11, a fixing member 12 and a rotating assembly 13, the fixing member 12 and the rotating assembly 13 are installed on the base 11, the fixing member 12 can be fixed to one end of the workpiece 5, and the rotating assembly 13 can drive the fixing member 12 to rotate.

As shown in fig. 2, the base 11 is a vertically disposed plate-shaped structure, the fixing element 12 and the rotating element 13 are disposed at the upper end of the base 11 and located at two sides of the plate-shaped structure, respectively, and the fixing element 12 can fix one end of the workpiece 5.

Further, the first fixing portion 1 further includes a connecting shaft 14, the base 11 is provided with a through hole 111, the connecting shaft 14 can pass through the through hole 111, and the fixing member 12 and the rotating assembly 13 are respectively fixed at two ends of the connecting shaft 14.

As shown in fig. 3 and 4, the connecting shaft 14 passes through the through hole 111 of the base 11, and two ends of the connecting shaft are respectively connected to the fixing member 12 and the rotating member 13, the rotating member 13 can drive the connecting shaft 14 to rotate, and the fixing member 12 can also rotate along with the connecting shaft 14.

The fixing member 12 is embodied as a chuck capable of clamping and fixing one end of the workpiece 5, and the chuck is easy to determine the axial position and facilitates fixing both ends of the workpiece 5 coaxially with the second fixing portion 2.

The fixing member 12 is a three-jaw chuck in this embodiment, and three jaws 121 of the three-jaw chuck can be tightened to clamp and fix one end of the workpiece 5 therein. Of course, the fixing member 12 may be a structure other than a chuck, and the present invention is not limited thereto as long as the fixing member 12 can fix one end of the workpiece 5.

In this embodiment, the rotating assembly 13 may include a driving portion 131 and a bearing 132, the bearing 132 is disposed inside the through hole 111 and is sleeved on the connecting shaft 14, and the driving portion 131 can drive the connecting shaft 14 to rotate around the axis through the bearing 132.

As shown in fig. 2-4, the driving portion 131 is a rotating handle having four grips, and the operator can operate the grips to drive the rotating handle to rotate around the axis, the bearing 132 is disposed inside the through hole 111 and sleeved with the connecting shaft 14, and the connecting shaft 14 is fixedly connected to the driving portion 131, so that the operator can operate the grips to drive the connecting shaft 14 to rotate around the axis, and further drive the workpiece 5 to rotate.

The structure of the driving portion 131 is not limited to the structure adopted in the embodiment, and other structures may be adopted in practical applications, for example, the driving portion 131 is designed to be a steering wheel-shaped structure or an L-shaped handle, and the driver can operate the driving portion to rotate; similarly, the bearing 132 may be replaced by another structure, as long as the connecting shaft 14 can rotate in the through hole 111 through the bearing 132, and the bearing 132 may not be actually provided, so that the rotation of the workpiece 5 is smoother by the bearing 132.

Of course, the connected mode of rotating assembly 13 and connecting axle 14, the connected mode of connecting axle 14 and mounting 12 and the connected mode of connecting axle 14 and base 11, the utility model discloses all do not do the injecing, can adopt modes such as threaded connection, welding or interference fit to connect. If the connection mode between the connection shaft 14 and the base 11 is changed, the structure of the base 11 having the through hole 111 may be changed, and the through hole 111 may not be provided as long as the connection shaft 14 can be mounted on the base 11 and rotated by the rotating assembly 13.

In this embodiment, the first fixing portion 1 may further include a bearing fixing ring 15, one side inside the through hole 111 is provided with a step surface 112, and the bearing fixing ring 15 and the step surface 112 can limit the bearing 132 inside the through hole 111.

Referring to fig. 4, after the bearing 132 is installed in the through hole 111 from one side of the rotating component 13, the bearing fixing ring 15 is installed outside the through hole 111, and the bearing 132 is limited inside the through hole 111 by the bearing fixing ring 15 and the step surface 112. The connecting shaft 14 is further provided with a bearing retainer 141, and when the connecting shaft 14 is inserted from one side of the fixing member 12, the bearing retainer 141 abuts against the bearing 132 to prevent the connecting shaft 14 from coming off from the other side.

Referring to fig. 5 and fig. 6, fig. 5 is a schematic structural view of the second fixing portion in fig. 1; fig. 6 is a schematic cross-sectional view of the workpiece of fig. 1 during coaxiality adjustment.

The second fixing part 2 comprises a base, a thimble 23 and a pushing ejector rod 24, the base is provided with a sleeve 221, the thimble 23 can be installed at the front end of an inner hole of the sleeve 221, the pushing ejector rod 24 can be installed at the rear end of the inner hole, the front end of the thimble sleeve 221 faces one end of the workpiece 5, the rear end of the thimble sleeve 221 faces away from one end of the workpiece 5, and both the thimble 23 and the pushing ejector rod 24 can slide in the inner hole; the push-in push rod 24 can push the thimble 23 to move towards the front end of the sleeve 221, so that the thimble 23 can tightly push and fix one end of the workpiece 5, the end of the workpiece 5 can be provided with a hole at the axial position, and the thimble 23 is pushed into the hole, thereby ensuring that the coaxial installation is completed by matching with the first fixing part 1.

As shown in fig. 5, the push rod 24 is mounted at the rear end of the inner hole of the sleeve 221, a grip for an operator to operate is arranged at the rear end of the push rod 24, the operator can rotate the push rod 24 through the grip, an inner thread is arranged at the rear end of the inner hole of the sleeve 221, a corresponding outer thread is arranged at the part of the push rod 24 inserted into the sleeve 221, the push rod 24 and the sleeve 221 are in threaded fit, and when the push rod 24 rotates, the push rod 24 can move back and forth inside the sleeve 221; when the push rod 24 moves toward the front end, it can abut against the rear end of the thimble 23 to push the thimble 23 to move forward, so that the worker can rotate the push rod 24 to move the thimble 23 toward the front end in the sleeve 221.

When the arrangement mode is adopted, if the thimble 23 is supposed to move towards the rear end, a worker can move the push rod 24 backwards, and manually push the thimble 23 to leak out of the front end of the sleeve 221 so as to retract the thimble 23 into the sleeve 221; the push-in ejector rod 24 and the ejector pin 23 can also be in a fixed connection relationship, after the push-in ejector rod 24 and the ejector pin 23 are respectively installed from two sides of the sleeve 221, the front end of the push-in ejector rod 24 and the rear end of the ejector pin 23 are fixedly connected inside the sleeve 221 through threaded connection, interference fit and the like, and by adopting the arrangement mode, a worker can control the ejector pin 23 by rotating the push-in ejector rod 24, so that the ejector pin 23 moves back and forth inside the sleeve 221; the push rod 24 and the thimble 23 may also be integrally formed, in which case, the external thread portion of the push rod 24 and the grip portion need to be separately arranged so that the push rod 24 and the thimble 23 can be screwed into the inner hole from the front end of the sleeve 221.

The second fixing portion 2 further includes a locking screw 25, the locking screw 25 penetrates through the wall of the sleeve 221, and the locking screw 25 can abut against the circumferential wall of the thimble 23 to lock the thimble 23, so that the thimble 23 and the sleeve 221 are relatively fixed.

As shown in fig. 6, the locking screw 25 is provided to prevent the thimble 23 from moving back and forth when fixing the workpiece 5, and if the connection relationship between the thimble 23 and the push rod 24 is fixed connection or integral molding, the thimble 23 can be ensured not to move back and forth by external force through the push rod 24, and the locking screw 25 may not be provided, and the positioning effect can be further ensured by providing the locking screw 25.

In this embodiment, the base includes a fixed bottom plate 21 and a movable bottom plate 22, which are matched with each other, the sleeve 221 is installed or integrally disposed on the movable bottom plate 22, and the movable bottom plate 22 can slide on the fixed bottom plate 21 along the axial direction and can be locked with the fixed bottom plate 21.

Specifically referring to fig. 5 and 6, the fixing base plate 21 includes a slide rail 211, the moving base 22 includes a slider 222 capable of cooperating with the slide rail 211, the slider 222 is capable of freely sliding on the slide rail 211, the fixing base plate 21 further includes a plurality of bolt holes 212 arranged at intervals, a hole having the same specification as the bolt holes 212 is arranged on the moving base 22, and the fixing bolt 26 can pass through the hole and any one of the bolt holes 212 to lock the moving base 22 at the position of the bolt hole 212 passing through.

The bolt holes 212 are arranged in a plurality at intervals in the axial direction, and the movable base 22 can be locked at a corresponding position by selecting the bolt hole 212 at any position and by the fixing bolt 26, so that the ejector pin 23 can fix the workpiece 5 at a proper position.

Of course, this is only the locking manner of the fixed base plate 21 and the movable base 22 selected in this embodiment, and in practical applications, other locking manners may be selected. Such as jaw locking, etc.; similarly, the fixed base plate 21 and the movable base 22 may also be connected by other than slide rail and slide block fit, such as rack and pinion fit, as long as the movable base 22 can slide on the fixed base plate 21 and be locked at a specified position.

Referring to fig. 7, fig. 7 is a schematic structural diagram of the workpiece in fig. 1.

The coaxiality adjusting device is used for adjusting the coaxiality of the workpiece 5, in this embodiment, the workpiece 5 is a half shaft of a vehicle, specifically, as shown in fig. 7, the half shaft includes a first half shaft section and a second half shaft section which are connected through a sleeve 53 and are welded and fixed, as described in the background art, the first half shaft section and the second half shaft section are respectively parts of half shafts with two specifications, one end of the first half shaft section is a spline end 51, one end of the second half shaft section is a flange end 52, and the other ends of the first half shaft section and the second half shaft section are connected through the sleeve 53 and are welded and fixed. The thimble 23 can be pushed into the end surface center hole of the flange end 52 of the second semi-axis section, the second fixing portion 2 and the first fixing portion 1 are coaxial, the mounting position locates the axis position of the flange end 52, the first fixing portion 1 can fix the spline end 51 of the first semi-axis section, and after the chuck clamps the spline end 51, the first fixing portion 1 and the second fixing portion 2 are coaxial, the mounting position locates the axis of the spline end 51, thereby realizing the coaxial mounting of the two ends of the workpiece 5. For the half shaft, the axis offset position is mainly at the position of the sleeve 53, the measuring part 3 can be correspondingly arranged at the position of the sleeve 53, and during the rotation of the half shaft, the measuring part 3 can measure the position of the sleeve 53 by 360 degrees to measure the offset of the position of the sleeve 53.

The worker operates the driving part 131 of the first fixing part 1 to rotate the half shaft between the first fixing part 1 and the second fixing part 2, the measuring part 3 is arranged at the position of the sleeve 53 of the half shaft, the measuring part 3 can measure the maximum offset of the position of the sleeve 53 of the half shaft in the rotation process of the half shaft, as shown in fig. 1, the measuring part 3 is arranged above the workpiece 5, the lowest point of the sleeve 53 is measured, namely the position corresponding to the maximum offset, the lowest point can be reversely adjusted through the adjusting part 4 arranged below the workpiece 5, for example, the sleeve is lifted upwards for a certain distance, so that the detected lowest point is reduced in offset, and the operation is repeated for many times, and the whole half shaft can be coaxial.

It can be understood that the workpiece 5 in this embodiment is a half shaft, in practical applications, the workpiece 5 may also be another component requiring coaxiality adjustment, and if the three-jaw chuck of the first fixing portion 1 and the thimble 23 of the second fixing portion 2 in this embodiment cannot meet the fixing requirement of the workpiece 5 to be adjusted, or the workpiece 5 to be adjusted cannot rotate around the same axis, the first fixing portion 1 and the second fixing portion 2 may also adopt another structure to fix and rotate the workpiece 5, as long as it is ensured that the workpiece 5 can be fixed between the two and can rotate around the same axis.

In this embodiment, the measuring unit 3 is a height gauge, and the adjusting unit 4 is a jack. In addition, the measuring section 3 and the adjusting section 4 are respectively disposed above and below the workpiece 5, or below and above the workpiece, so that when the measuring section 3 detects the lowest point or the highest point, the adjusting section 4 can perform reverse adjustment to offset the offset amount.

When the workpiece 5 rotates, the height gauge can measure the maximum offset of the workpiece 5 in the rotating process, the jack can abut against and extrude the workpiece 5 to enable the workpiece 5 to deform, finally, the extruded part of the workpiece 5 is adjusted to the axis position, and after the process is repeated for multiple times, the whole workpiece 5 can tend to be coaxial.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (12)

1. A coaxiality adjusting device is characterized in that: comprises a first fixing part (1) and a second fixing part (2), two ends of a workpiece (5) to be adjusted are respectively and coaxially arranged on the first fixing part and the second fixing part, and the workpiece (5) can rotate around an axis;

the coaxiality adjusting device further comprises a measuring part (3) and an adjusting part (4), wherein the measuring part (3) can measure the offset of the measured position in the rotating process of the workpiece (5), and the adjusting part (4) can adjust the coaxiality of the workpiece (5) according to the offset.

2. The coaxiality adjustment apparatus according to claim 1, wherein: the first fixing part (1) comprises a base (11), a fixing part (12) and a rotating assembly (13), the fixing part (12) and the rotating assembly (13) are installed on the base (11), the fixing part (12) can be fixed to one end of a workpiece (5), and the rotating assembly (13) can drive the fixing part (12) to rotate.

3. The coaxiality adjustment apparatus according to claim 2, wherein: the first fixing portion (1) further comprises a connecting shaft (14), the base (11) is provided with a through hole (111), the connecting shaft (14) can penetrate through the through hole (111), and the fixing piece (12) and the rotating assembly (13) are fixed at two ends of the connecting shaft (14) respectively.

4. The coaxiality adjustment apparatus according to claim 3, wherein: the fixing piece (12) is a chuck which can clamp and fix one end of the workpiece (5).

5. The coaxiality adjustment apparatus according to claim 3, wherein: the rotating assembly (13) comprises a driving part (131) and a bearing (132), the bearing (132) is arranged in the through hole (111) and sleeved with the connecting shaft (14), and the driving part (131) can drive the connecting shaft (14) to rotate around an axis through the bearing (132).

6. The coaxiality adjustment apparatus according to claim 5, wherein: the first fixing portion (1) further comprises a bearing fixing ring (15), a step surface (112) is arranged on one side inside the through hole (111), and the bearing fixing ring (15) and the step surface (112) can limit the bearing (132) inside the through hole (111).

7. The coaxiality adjustment apparatus according to any one of claims 1 to 6, wherein: the second fixing part (2) comprises a base, a thimble (23) and a pushing ejector rod (24), the base is provided with a sleeve (221), the thimble (23) can be installed at the front end of an inner hole of the sleeve (221), the pushing ejector rod (24) can be installed at the rear end of the inner hole, and the thimble (23) and the pushing ejector rod (24) can move in the inner hole;

the push-in ejector rod (24) can push the ejector pin (23) to move towards the front end of the sleeve (221), so that the ejector pin (23) tightly pushes and fixes one end of the workpiece (5).

8. The coaxiality adjustment apparatus according to claim 7, wherein: the second fixing part (2) further comprises a locking screw rod (25), the locking screw rod (25) penetrates through the cylinder wall of the sleeve (221), and the locking screw rod (25) can abut against the peripheral wall of the ejector pin (23) to lock the ejector pin (23) so as to enable the ejector pin (23) to be fixed relative to the sleeve (221).

9. The coaxiality adjustment apparatus according to claim 7, wherein: the base comprises a fixed bottom plate (21) and a movable base (22) which are matched, and the sleeve (221) is arranged on or integrally arranged on the movable base (22); the movable base (22) can slide on the fixed bottom plate (21) along the axial direction and can be locked with the fixed bottom plate (21).

10. The coaxiality adjustment apparatus according to claim 7, wherein: the workpiece (5) is a half shaft which comprises a first half shaft section and a second half shaft section which are connected through a sleeve (53) and are fixed by welding; the thimble (23) can push into the end face center hole of the flange end (52) of the second half shaft section, the spline end (51) of the first half shaft section can be fixed by the first fixing part (1), and the offset of the position of the sleeve (53) can be measured in the half shaft rotation process by the measuring part (3).

11. The coaxiality adjustment apparatus according to any one of claims 1 to 6, wherein: the measuring part (3) and the adjusting part (4) are respectively positioned above and below the workpiece (5) or below and above the workpiece.

12. The coaxiality adjustment apparatus according to claim 11, wherein: the measuring part (3) is a height gauge; and/or the adjusting part (4) is a jack.

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