CN117190967A - Star gear finished product straightness detection equipment and detection method - Google Patents

Abstract

The invention relates to the field of mechanical part detection, and particularly discloses star gear finished product straightness detection equipment and a detection method, wherein the detection equipment comprises a detection table, a limiting die and a positioning clamp, the limiting die comprises a limiting pad propped against the end face of a star gear, a positioning die and a moving part for driving the positioning die to vertically move up and down, the limiting pad is circular, a boss propped against the inner diameter of the star gear is coaxially and fixedly arranged on the limiting pad, and the positioning die is cylindrical and has the diameter consistent with the indexing circle diameter of the star gear; one end of the positioning die is coaxially and fixedly provided with a limiting piece propped against the inner wall of the star gear, and the axis of the positioning clamp is opposite to the axis of the positioning die. In this scheme, positioning die, locating part and the star gear that awaits measuring are connected and the separation is convenient, and when positioning die, locating part and the star gear that awaits measuring stable separation, avoid waiting to await measuring the star gear and remove the back and detect the mounting groove of inner wall and produce the influence.

Description

Star gear finished product straightness detection equipment and detection method

Technical Field

The invention relates to the technical field of mechanical part detection, in particular to star gear finished product straightness detection equipment and a detection method.

Background

Star gears refer to a system of gears that, in addition to being able to rotate about their own axis of rotation as do fixed axis gears, also rotate with the carrier about the axis of the other gears. The gear system comprises a plurality of star gears which are different in specification and matched with each other, and when the star gears are matched with each other, the matching degree between the star gears is required to be high, and then the requirements on the machining precision and the detection precision of the whole star gears are higher. The machining precision and the detection precision are mutually dependent, and the product precision of the final star gear is greatly influenced.

When detecting a star gear, a touch pen is generally adopted to cooperate with a fixture, parameters such as radial runout, common normal length variation, common normal length average deviation, tooth thickness error and the like of the gear are measured, for example, a suitable method and device for measuring a space object is applied for patent application number DE102007015947A1, and the contour of the object on the fixture can be measured.

However, when the device detects the star gear with smaller structure, a positioning die is arranged at one end of the star gear to provide standard size for the star gear; because the inner wall of the star gear is provided with the mounting groove for mounting structures such as a shaft, a ball and the like, if the mounting groove needs to be detected, the positioning die on the star gear after clamping and positioning needs to be disassembled, the positioning die is generally taken out in a manual mode, and if the positioning die is taken out and collides with the star gear, the star gear can be influenced to the clamping precision, and the detection precision of the star gear can be influenced; meanwhile, when the positioning die is taken out by adopting a manual mode, the taking-out efficiency is lower, and the detection efficiency of the star gears can be influenced.

Disclosure of Invention

Aiming at the defects existing in the prior art, the invention provides a star gear finished product straightness detection device and a detection method, so as to solve the problems that a positioning die and a star gear to be detected are separated manually, the efficiency is low, and the clamping precision of the star gear to be detected is easily affected.

In order to achieve the above object, the basic scheme of the present invention is as follows: the star gear finished product straightness detection equipment comprises a detection table and a positioning clamp, wherein the positioning clamp is arranged on the detection table, the star gear finished product straightness detection equipment further comprises a limiting die, the limiting die comprises a limiting pad propped against the end face of a star gear, a positioning die and a moving part for driving the positioning die to vertically move up and down, the limiting pad is circular, a boss propped against the inner diameter of the star gear is coaxially and fixedly arranged on the limiting pad, and the positioning die is cylindrical and has a diameter consistent with the reference circle diameter of the star gear; one end of the positioning die is coaxially and fixedly provided with a limiting piece propped against the inner wall of the star gear, and the axis of the positioning clamp is opposite to the axis of the positioning die.

The technical principle of the invention is as follows: when the detection of the star gear to be detected is carried out, the limiting pad is arranged on one end of the star gear to be detected, and the side wall of the boss abuts against the inner wall of the star gear to be detected; then placing the limiting pad and the star gear to be tested on a positioning clamp, and clamping the limiting pad by the positioning clamp, so that the star gear to be tested keeps a flat clamping state under the action of the flat limiting pad; then the moving part drives the positioning die and the limiting piece to move downwards, the positioning die and the limiting piece are inserted into the star gear to limit the star gear, and the positioning die can provide reference data for detection of the star gear to be detected; after the detection of the parameters of the outer wall of the star gear to be detected is completed, the moving part drives the positioning die and the limiting piece to move upwards, so that the positioning die and the limiting piece are separated from the star gear to be detected, and the verticality of the mounting groove of the inner wall of the star gear to be detected is conveniently detected; in the process, the positioning die, the limiting piece and the star gear to be detected are convenient to connect and separate, the probe can conveniently and rapidly and accurately detect the outer wall parameters of the star gear to be detected and the parameters of the inner wall mounting groove according to the sequence, the positioning die, the limiting piece and the star gear to be detected can be stably separated, and the influence on the detection of the mounting groove of the inner wall after the star gear to be detected moves is avoided.

Further, the movable part comprises a support column, a fixing rod and a power part for driving the fixing rod to vertically move up and down, the power part is arranged at the upper end of the support column, the lower end of the support column is fixedly connected with the detection table, and the lower end of the fixing rod is fixedly connected with one end of the positioning die, which is far away from the limiting part.

Through the cooperation of dead lever and power portion, can stably and rapidly drive positioning die and locating part reciprocates, the positioning die of being convenient for and locating part and the star gear cooperation that awaits measuring.

Further, the power part comprises a driving gear and a plurality of disk-shaped teeth meshed with the driving gear, the disk-shaped teeth are coaxially and fixedly arranged on the outer wall of the fixed rod, and the plane of the single disk-shaped tooth is perpendicular to the axis of the fixed rod.

Through the arrangement, the driving gear can convert rotation into up-and-down movement of the fixing rod through the disc-shaped teeth, and the vertical movement of the fixing rod is more stable and effective.

Further, the fixing rod is coaxially arranged with the positioning die.

Through above-mentioned setting, when positioning die and locating part and the dislocation of waiting for measuring the star gear circumference exist, also only need rotate the dead lever, let positioning die and locating part and waiting for measuring the star gear match can, let positioning die and locating part and waiting for measuring the star gear be connected and the separation more convenient and high-efficient.

Further, the limiting piece comprises a fixed shaft and a plurality of flanges, the fixed shaft is coaxially and fixedly arranged at one end, far away from the fixed rod, of the positioning die, the flanges are circumferentially and fixedly arranged on the outer wall of the fixed shaft, and the flanges are abutted against the inner wall of the star gear.

Through the arrangement, the fixed shaft and the flanges can be matched with the inner wall of the star gear to be detected, so that the star gear to be detected can be reliably positioned.

Further, the device also comprises a processor, an information display input terminal, a probe and a leveling unit for leveling the positioning clamp, wherein the information display input terminal, the probe and the leveling unit are electrically connected with the processor, and the probe is vertically and slidably arranged on the detection table.

Through the arrangement, the information display input terminal can input corresponding detection instructions, and the processor can process and control the instructions, so that the probes and the leveling unit can rapidly detect relevant parameters.

Further, still include laser emitter and laser receiver, laser emitter and laser receiver all with the treater electric connection, laser emitter fixed mounting keeps away from the center department of detecting bench one side at positioning fixture, laser receiver fixed mounting keeps away from the center department of positioning die one end at the fixed axle, laser emitter is relative with laser receiver, and the center department of spacing pad is equipped with the through-hole.

Through the cooperation of laser emitter and laser receiver, laser that laser emitter sent can pass the through-hole and be received by laser receiver, and this in-process is through knowing the laser receiver and to the receiving condition of ray whether judge positioning die and fixed axle are relative with star gear and positioning fixture that awaits measuring, and the location installation of the star gear of being convenient for await measuring is accurate.

Further, the device also comprises an extension pipe, an annular groove is coaxially arranged at the lower end of the fixed shaft, a first thread is coaxially arranged at the annular groove of the fixed shaft, a second thread meshed with the first thread is arranged on the extension pipe, and the outer wall of the extension pipe can prop against the outer ring of the annular groove.

Through the arrangement, the meshing length of the first thread and the second thread on the fixed shaft and the extension pipe is controlled, so that the length of the extension pipe outside the annular groove is controlled, and the positioning die, the fixed shaft and the extension pipe are convenient to limit the star gears to be detected with different length specifications.

Further, the first thread is located on the inner ring of the annular groove of the fixed shaft, the second thread is located on the inner wall of the extension pipe, and the laser transmitter is located in the inner ring of the annular groove.

Through above-mentioned setting, laser emitter does not receive the influence of extension tube structure, and first screw thread and second screw thread's connection is more stable simultaneously.

Further, the detection method of the star gear finished product straightness detection equipment comprises the following steps:

step 1: preparing star gear finished product straightness detection equipment and a plurality of star gears to be detected, and controlling a leveling unit to level a positioning clamp, wherein the upper end surface of the positioning clamp is parallel to a horizontal plane;

step 2: mounting a limit pad on one end of a star gear to be tested, wherein the side wall of the boss abuts against the inner wall of the star gear to be tested; then placing the limiting pad and the star gear to be tested on a positioning clamp, and clamping the limiting pad by the positioning clamp; the driving gear is controlled to rotate positively, the driving gear is meshed with the disc-shaped teeth and drives the fixing rod to move downwards, the positioning die, the fixing shaft and the extension tube move downwards synchronously, the positioning die, the fixing shaft and the extension tube are detected into the star gear to limit the star gear, laser emitted by the laser transmitter is accurately received by the laser receiver, and positioning of the star gear to be detected is completed;

step 3: the probe is controlled to move downwards through the information display input terminal, the probe positions the outer wall of the positioning die, and the accurate size of the star gear to be detected is measured; then the probe continues to move downwards, and the tooth top, tooth root, reference circle and radial runout of the star gear to be measured are measured;

step 4: the driving gear reversely rotates, the driving gear is meshed with the disk-shaped teeth and drives the fixing rod to move upwards, the positioning die, the fixing shaft and the extension pipe synchronously move upwards, the positioning die, the fixing shaft and the extension pipe are separated from the star gear to be detected, the probe moves to the inner wall of the star gear to be detected, and the verticality of the mounting groove on the inner wall of the star gear to be detected is measured;

step 5: after the measurement is completed, the star gear to be measured which is completed in the measurement is disassembled, and the star gear to be measured is separated from the positioning die, the fixed shaft and the extension tube.

Through the arrangement, the positioning fixture can be leveled in the step 1, and conditions are provided for accurate installation of the subsequent star gears to be tested; in the step 2, the positioning die, the fixed shaft and the extension pipe move downwards under the control of the driving gear and the fixed rod, signals of the laser receiver can be monitored in real time, so that the positioning die, the fixed shaft, the extension pipe and the positioning clamp are convenient to control to be matched stably, and positioning of the star gear to be detected is completed; step 3 and step 4, the outer wall parameters and the parameters at the inner wall mounting groove of the star gear to be detected can be detected rapidly and accurately in sequence; meanwhile, the whole lengths of the positioning die, the fixed shaft and the extension pipe are convenient to adjust according to the size of the star gear to be detected, so that the star gears to be detected with different specifications can be detected conveniently, and the adaptability of the star gear to be detected is improved; meanwhile, under the cooperation of the driving gear, the disk-shaped teeth and the fixed rod, the positioning die, the fixed shaft and the extending pipe can not shake when moving up and down, so that the positioning die, the fixed shaft and the extending pipe can be stably separated from the star gear to be detected, and the influence on the detection of the mounting groove on the inner wall after the star gear to be detected moves is avoided.

Drawings

Fig. 1 is a schematic diagram of a structure of a star gear finished product straightness detection device in a shaft-side direction in an embodiment of the invention.

Fig. 2 is a longitudinal cross-sectional view of a star gear to be detected, a limit pad, a positioning die and a moving part in the star gear finished product straightness detection device according to the embodiment of the invention.

FIG. 3 is an exploded enlarged view of the star gear to be measured, the limit pad, the positioning die and the stationary shaft of FIG. 1.

In the above figures: the detecting table 10, the positioning jig 20, the leveling unit 201, the limit pad 301, the boss 302, the through hole 303, the positioning die 401, the fixed shaft 402, the flange 403, the annular groove 404, the extension pipe 405, the first screw 406, the second screw 407, the support column 50, the fixed rod 501, the motor 601, the driving gear 602, the disk-shaped teeth 603, the information display input terminal 70, the probe 701, the laser transmitter 702, the laser receiver 703, the star gear 80, and the mounting groove 801.

Detailed Description

The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.

The embodiment of the invention basically provides star gear finished product straightness detection equipment as shown in fig. 1, 2 and 3, which comprises a detection table 10, a positioning clamp 20, a limiting die, a limiting pad 301, a positioning die 401, a moving part for driving the positioning die 401 to vertically move up and down, a processor, an information display input terminal 70, a probe 701, an extension tube 405, a laser transmitter 702, a laser receiver 703 and a leveling unit 201 for leveling the positioning clamp 20, wherein the positioning clamp 20 is rotatably arranged on the detection table 10; the limiting pad 301 is circular, a through hole 303 is formed in the center of the limiting pad 301, a boss 302 propped against the inner diameter of the star gear 80 is coaxially and fixedly arranged on the limiting pad 301, the positioning die 401 is cylindrical, the diameter of the positioning die 401 is consistent with the reference circle diameter of the star gear 80, and the axis of the positioning clamp 20 is opposite to the axis of the positioning die 401.

As shown in fig. 1, 2 and 3, the moving part comprises a support column 50, a fixing rod 501 and a power part for driving the fixing rod 501 to vertically move up and down, the power part is arranged on the upper end of the support column 50, the lower end of the support column 50 is welded with the detection table 10, the lower end of the fixing rod 501 is welded with one end, far away from the limiting piece, of the positioning die 401, and the fixing rod 501 and the positioning die 401 are coaxially arranged; a limiting piece propping against the inner wall of the star gear 80 is coaxially and fixedly arranged at one end of the positioning die 401, the limiting piece comprises a fixed shaft 402 and a plurality of flanges 403, the fixed shaft 402 is coaxially welded at one end of the positioning die 401 far away from the fixed rod 501, the plurality of flanges 403 are circumferentially and integrally formed on the outer wall of the fixed shaft 402, and the flanges 403 prop against the inner wall of the mounting groove 801 of the star gear 80; the power part comprises a driving gear 602, a motor 601 driving the driving gear 602 to rotate and a plurality of disk-shaped teeth 603 meshed with the driving gear 602, wherein the motor 601 is fixed on a supporting column 50 through bolts, the disk-shaped teeth 603 are coaxially and integrally formed on the outer wall of the fixed rod 501, and the plane where the single disk-shaped teeth 603 are located is perpendicular to the axis of the fixed rod 501.

As shown in fig. 2, an annular groove 404 is coaxially arranged at the lower end of the fixed shaft 402, a first thread 406 is coaxially arranged at the annular groove 404 of the fixed shaft 402, a second thread 407 meshed with the first thread 406 is arranged on the extension pipe 405, and the outer wall of the extension pipe 405 can prop against the outer ring of the annular groove 404; the first screw thread 406 is located on the inner ring of the annular groove 404 of the stationary shaft 402 and the second screw thread 407 is located on the inner wall of the extension pipe 405.

The information display input terminal 70, the probe 701 and the leveling unit 201 are electrically coupled with the processor, the probe 701 is vertically and slidably mounted on the detection table 10, the laser transmitter 702 and the laser receiver 703 are electrically coupled with the processor, the laser transmitter 702 is embedded and fixed at the center of the upper side of the positioning fixture 20, the laser receiver 703 is embedded and fixed at the center of the lower end face of the fixed shaft 402, the laser transmitter 702 is opposite to the laser receiver 703, and the laser transmitter 702 is located in the inner ring of the annular groove 404.

When the star gear 80 to be detected is performed by adopting the star gear finished product straightness detection equipment, the following detection method is adopted, and specifically comprises the following steps of:

step 1: preparing star gear finished product straightness detection equipment and a plurality of star gears 80 to be detected, checking according to the levelness of the positioning clamp 20 displayed by the information display input terminal 70, and transmitting corresponding flatness information to the information display input terminal 70 by a processor according to real-time feedback of the leveling unit 201, wherein the leveling unit 201 is controlled to level the positioning clamp 20 at the moment so that the upper end face of the positioning clamp 20 is parallel to the horizontal plane;

step 2: mounting a limit pad 301 on one end of the star gear 80 to be tested, wherein the side wall of a boss 302 is propped against the inner wall of the star gear 80 to be tested, so that the end face of the star gear 80 to be tested is kept in a flat state; then, placing the limiting pad 301 and the star gear 80 to be tested on the positioning clamp 20, and clamping the limiting pad 301 by the positioning clamp 20 so that the star gear 80 to be tested keeps a flat clamping state; then the motor 601 drives the driving gear 602 to rotate forward, the driving gear 602 is meshed with the disk-shaped teeth 603 and drives the fixing rod 501 to move downwards, the positioning die 401, the fixing shaft 402 and the extension tube 405 move downwards synchronously, the positioning die 401, the fixing shaft 402 and the extension tube 405 are inserted into the star gear 80 to limit the star gear 80, the flange 403 is propped against the mounting groove 801 of the star gear 80 to be tested, laser emitted by the laser emitter 702 is accurately received by the laser receiver 703, a receiving signal of the laser receiver 703 is transmitted to the information display input terminal 70 by the processor, the positioning accuracy of the positioning die 401, the fixing shaft 402 and the extension tube 405 can be known, and the positioning of the star gear 80 to be tested is completed; in the process, the meshing length of the first thread 406 and the second thread 407 on the fixed shaft 402 and the extension tube 405 can be controlled, so that the length of the extension tube 405 outside the annular groove 404 is controlled, and the positioning die 401, the fixed shaft 402 and the extension tube 405 are convenient for limiting the star gears 80 to be tested with different length specifications;

step 3: the probe 701 is controlled to move downwards through the information display input terminal 70, the probe 701 positions the outer wall of the positioning die 401, and the accurate size of the star gear 80 to be measured is measured; then the probe 701 continues to move downwards, and the tooth top, tooth root, reference circle and radial runout of the star gear 80 to be measured are measured;

step 4: the motor 601 controls the driving gear 602 to reversely rotate, the driving gear 602 is meshed with the disk-shaped teeth 603 and drives the fixed rod 501 to move upwards, the positioning die 401, the fixed shaft 402 and the extension tube 405 synchronously move upwards, the positioning die 401, the fixed shaft 402 and the extension tube 405 are separated from the star gear 80 to be detected, the probe 701 moves to the inner wall of the star gear 80 to be detected, and the verticality of the mounting groove 801 on the inner wall of the star gear 80 to be detected is measured; in the process, the positioning fixture 20 drives the limit pad 301 and the star gear 80 to be tested to rotate, so that the mounting groove 801 on the inner wall of the star gear 80 to be tested can be opposite to the probe 701, and multiple detection is realized;

step 5: after the measurement is completed, the star gear 80 to be measured is disassembled, and the star gear 80 to be measured is separated from the positioning die 401, the fixed shaft 402 and the extension tube 405.

In the above process, the positioning mold 401, the fixed shaft 402 and the extension tube 405 are convenient to connect and separate with the star gear 80 to be measured, and the probe 701 can detect the outer wall parameters of the star gear 80 to be measured and the parameters at the inner wall mounting groove 801 in sequence, rapidly and accurately; simultaneously, the whole lengths of the positioning die 401, the fixed shaft 402 and the extension tube 405 are convenient to adjust according to the size of the star gear 80 to be detected, so that the star gears 80 to be detected with different specifications can be detected conveniently, and the adaptability of the star gear 80 to be detected is improved; meanwhile, under the cooperation of the driving gear 602, the disk teeth and the fixing rod 501, the up-and-down movement of the positioning die 401, the fixing shaft 402 and the extension tube 405 can not shake, so that the positioning die 401, the fixing shaft 402 and the extension tube 405 can be stably separated from the star gear 80 to be detected, and the influence on the detection of the mounting groove 801 on the inner wall after the movement of the star gear 80 to be detected is avoided.

Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.

Claims (10)

1. The star gear finished product straightness detection equipment comprises a detection table and a positioning clamp, wherein the positioning clamp is arranged on the detection table, and is characterized by further comprising a limiting die, wherein the limiting die comprises a limiting pad propped against the end face of a star gear, a positioning die and a moving part for driving the positioning die to vertically move up and down, the limiting pad is circular, a boss propped against the inner diameter of the star gear is coaxially and fixedly arranged on the limiting pad, and the positioning die is cylindrical and has a diameter consistent with the reference circle diameter of the star gear; one end of the positioning die is coaxially and fixedly provided with a limiting piece propped against the inner wall of the star gear, and the axis of the positioning clamp is opposite to the axis of the positioning die.

2. The star gear finished product straightness detection equipment according to claim 1, wherein the moving part comprises a support column, a fixing rod and a power part for driving the fixing rod to vertically move up and down, the power part is arranged at the upper end of the support column, the lower end of the support column is fixedly connected with the detection table, and the lower end of the fixing rod is fixedly connected with one end of the positioning die, which is far away from the limiting piece.

3. The star gear finished product straightness detection device according to claim 2, wherein the power part comprises a driving gear and a plurality of disk-shaped teeth meshed with the driving gear, the disk-shaped teeth are coaxially and fixedly arranged on the outer wall of the fixed rod, and the plane of the single disk-shaped teeth is perpendicular to the axis of the fixed rod.

4. The star gear finished product straightness detection apparatus as claimed in claim 3, wherein the fixing rod is coaxially disposed with the positioning die.

5. The device for detecting the straightness of a finished star gear according to claim 4, wherein the limiting member comprises a fixed shaft and a plurality of flanges, the fixed shaft is coaxially and fixedly arranged at one end of the positioning die, which is far away from the fixed rod, the flanges are circumferentially and fixedly arranged on the outer wall of the fixed shaft, and the flanges are propped against the inner wall of the star gear.

6. The star gear finished product straightness detection apparatus according to claim 5, further comprising a processor, an information display input terminal, a probe and a leveling unit for leveling the positioning fixture, wherein the information display input terminal, the probe and the leveling unit are electrically coupled to the processor, and the probe is vertically slidably mounted on the detection table.

7. The star gear finished product straightness detection apparatus as set forth in claim 6, further comprising a laser transmitter and a laser receiver, both of which are electrically coupled to the processor, the laser transmitter being fixedly mounted at a center of a side of the positioning jig remote from the detection table, the laser receiver being fixedly mounted at a center of a fixed shaft remote from one end of the positioning jig, the laser transmitter being opposite to the laser receiver, and a through hole being provided at a center of the limit pad.

8. The star gear finished product straightness detection device according to claim 7, further comprising an extension tube, wherein an annular groove is coaxially arranged at the lower end of the fixed shaft, a first thread is coaxially arranged at the annular groove of the fixed shaft, a second thread meshed with the first thread is arranged on the extension tube, and the outer wall of the extension tube can abut against the outer ring of the annular groove.

9. The star gear finished product straightness detection apparatus as set forth in claim 8, wherein the first screw thread is located on an inner ring of the annular groove of the stationary shaft, the second screw thread is located on an inner wall of the extension pipe, and the laser emitter is located in an inner ring of the annular groove.

10. The method for detecting the straightness of a finished star gear according to claim 9, comprising the steps of:

step 1: preparing star gear finished product straightness detection equipment and a plurality of star gears to be detected, and controlling a leveling unit to level a positioning clamp, wherein the upper end surface of the positioning clamp is parallel to a horizontal plane;

step 2: mounting a limit pad on one end of a star gear to be tested, wherein the side wall of the boss abuts against the inner wall of the star gear to be tested; then placing the limiting pad and the star gear to be tested on a positioning clamp, and clamping the limiting pad by the positioning clamp; the driving gear is controlled to rotate positively, the driving gear is meshed with the disc-shaped teeth and drives the fixing rod to move downwards, the positioning die, the fixing shaft and the extension tube move downwards synchronously, the positioning die, the fixing shaft and the extension tube are detected into the star gear to limit the star gear, laser emitted by the laser transmitter is accurately received by the laser receiver, and positioning of the star gear to be detected is completed;

step 3: the probe is controlled to move downwards through the information display input terminal, the probe positions the outer wall of the positioning die, and the accurate size of the star gear to be detected is measured; then the probe continues to move downwards, and the tooth top, tooth root, reference circle and radial runout of the star gear to be measured are measured;

step 4: the driving gear reversely rotates, the driving gear is meshed with the disk-shaped teeth and drives the fixing rod to move upwards, the positioning die, the fixing shaft and the extension pipe synchronously move upwards, the positioning die, the fixing shaft and the extension pipe are separated from the star gear to be detected, the probe moves to the inner wall of the star gear to be detected, and the verticality of the mounting groove on the inner wall of the star gear to be detected is measured;

step 5: after the measurement is completed, the star gear to be measured which is completed in the measurement is disassembled, and the star gear to be measured is separated from the positioning die, the fixed shaft and the extension tube.