CN218916268U

CN218916268U - Protrusion quantity measuring instrument

Info

Publication number: CN218916268U
Application number: CN202223410244.6U
Authority: CN
Inventors: 邹鹏; 徐从占; 余礼; 张鹏程
Original assignee: Tianji Bearing Technology Zhejiang Co ltd
Current assignee: Tianji Bearing Technology Zhejiang Co ltd
Priority date: 2022-12-19
Filing date: 2022-12-19
Publication date: 2023-04-25
Anticipated expiration: 2032-12-19

Abstract

The utility model provides a protrusion quantity measuring instrument which comprises a frame, wherein a pressurizing mechanism and a material carrying assembly are arranged in the frame in a vertically opposite manner, the material carrying assembly is in driving connection by a rotating mechanism, the lower part of the material carrying assembly is abutted to a displacement sensor, and a circuit of the displacement sensor is connected with an industrial personal computer. According to the utility model, the standard component is arranged above the measuring pad and combined with the elastic floating structure below the measuring pad, so that the inner ring and the outer ring are pressurized in a stepping way during pressurization, the automatic adjustment loading process is realized, and meanwhile, the loading and unloading operation is simplified and the efficiency is improved. The intelligent control motor automatically rotates, the rotating assembly cooperates with the displacement sensor to automatically read, the steps of reading, storing, analyzing and the like are completed by computer software, manual reading and shaking of the inner ring of the bearing are not needed, reading errors and manual subjective reading errors are avoided, and the measuring accuracy and reliability are further improved. The loading part adopts the automatic loading pre-compaction of cylinder, and the loading is more convenient, reduces the manpower, reduces measuring cost.

Description

Protrusion quantity measuring instrument

Technical Field

The utility model belongs to the technical field of machinery, and relates to a measuring device, in particular to a protrusion measuring instrument.

Background

The prior art is a measuring mode that an old type protrusion measuring instrument and a load block are matched with a width meter frame.

The old-fashioned protrusion quantity measuring instrument adopts manual feeding and discharging, and each time feeding and discharging is required to take off and place a measuring pad from the bearing inner ring, a measured component is manually pushed to a measuring position, a loading lever is manually shifted, and finally the indication is read. The whole process is complicated, and the stability of the instrument is relatively poor; the manual degree record of the torsion spring meter has the risks of error reading and error recording, and the inner ring is required to be manually rocked to rotate relative to the outer ring during reading, so that the stability of the number represented by the torsion spring is poor, and the subjective influence of the reading person is large; the measuring tool such as the measuring pad has high precision requirement, is easy to wear and difficult to repair, and has low integral efficiency.

The load block is matched with the width meter frame for measurement, the load block needs to be manually turned during measurement, the heights of the two surfaces of the inner ring and the outer ring of the bearing are measured, and the height values of the two surfaces are subtracted manually to obtain the measurement protruding quantity. In the whole process, the torsion spring table needs to be read twice and data is recorded, so that error reading and error recording are easy; and the overturning load block is laborious, and mass production measurement cannot be realized for some models due to the fact that the load block is heavier. In addition, the load block has higher precision requirement, is easy to wear and difficult to repair, and has lower overall efficiency.

To solve the above-mentioned problems, for example, chinese patent literature discloses a bearing end face protrusion measuring device [ chinese patent No.: 200720073778.0A bearing end face protrusion measuring device can rapidly and efficiently finish the measuring process, effectively reduce the manufacturing cost of the bearing, and comprises a machine base and a pair of pressurizing rotating devices for applying pressure to the rotation of the measured bearing, wherein the pressurizing rotating devices are fixedly arranged on the machine base through an up-and-down carriage device which moves up and down, the two sides of the base of the machine base are provided with a left carriage device and a right carriage device, the left carriage device and the right carriage device are provided with sensors, a pressure sensor is arranged above the pressurizing rotating devices, the pressure sensor is connected with a control device for displaying a load value and controlling the measuring device, the pressurizing rotating devices are used for rotationally pressurizing the measured bearing fixed on the base of the machine base, and the sensors at the two ends of the measured bearing are used for respectively measuring the protrusion of the measured bearing and transmitting the protrusion to the control device for calculation and display; the load pressure value of the pressurizing rotating device is provided by a load spring, so that the stability of the load pressure is ensured, and the aim of the utility model is fulfilled.

According to the technical scheme, the pressure sensor is used for detecting the protruding amount, so that the protruding amount numerical value is required to be converted and calculated in an indirect measurement mode, and conversion calculation errors exist to influence measurement accuracy. In addition, the measured bearing adopts a fixed mode, and has no floating process, so that calibration cannot be performed, and the problem of poor accuracy of a measurement result exists.

Disclosure of Invention

The utility model aims at solving the problems in the prior art, and provides a protruding quantity measuring instrument which is matched with an elastic floating structure to automatically adjust a loading process, simplify loading and unloading operations and improve efficiency.

The aim of the utility model can be achieved by the following technical scheme: the utility model provides a protrusion quantity measuring instrument, includes the frame, be upper and lower counter setting pressurizing mechanism and carrying the material subassembly in the frame, carrying the material subassembly to be connected by rotary mechanism drive, carrying the below butt displacement sensor of material subassembly, displacement sensor circuit connection industrial computer.

In the above-mentioned protrusion quantity measuring instrument, the pressure mechanism includes the pressure cylinder, the flexible drive pressure axle of pressure cylinder, the pressure axle is upwards movable sleeve-joint pedestal mounting panel, thrust ball bearing, clamp plate, compression spring, spring plate and lock nut in proper order by the bottom, paste the pressurization frock admittedly on the bottom surface of pedestal mounting panel, the clamp plate with press from both sides between the pedestal mounting panel thrust ball bearing forms the trisome and links firmly, the compression spring bottom end is pressed and is held the clamp plate top surface, compression spring top butt spring plate bottom surface, lock nut with the screw thread locking cooperation of pressure axle.

In the above-mentioned protrusion quantity measuring instrument, the telescopic link bottom of pressurization cylinder passes through the adapter sleeve and links firmly the pressure axle, the telescopic link with press and press to insert between the axle and establish ceramic ball, ceramic ball is located inside the adapter sleeve.

In the above protrusion measuring instrument, the bottom end of the pressing shaft is fixedly provided with a locking end cover, the diameter of the locking end cover is larger than that of the pressing shaft, the center of the shaft collar mounting plate is provided with a countersink, and the locking end cover is embedded into the countersink to form a limiting clamping connection.

In the above protrusion quantity measuring instrument, at least two guide posts are erected on the frame, at least two guide holes are correspondingly formed in the pressing plate, and the guide posts penetrate through the guide holes to form sliding connection.

In the above-mentioned protrusion volume measuring instrument, carry the material subassembly including measuring the pad, the top surface of measuring the pad has annular step groove, the outer packing ring is cup jointed to the periphery of measuring the pad, the measuring pad bottom pass through the rotating assembly switching assemble in the frame.

In the above-mentioned protrusion quantity measuring instrument, the rotating assembly is including adorning admittedly in dustcoat in the frame, wear the axle sleeve admittedly on the dustcoat, the axle sleeve periphery cup joints swivel bearing, the swivel bearing periphery cup joints the support section of thick bamboo, the axle sleeve top is followed and is adorned the limiting plate admittedly, the support section of thick bamboo inner periphery sets up annular mesa, the limiting plate is located annular mesa top, the measuring pad with the support section of thick bamboo links firmly.

In the above-mentioned protrusion quantity measuring instrument, the rotary mechanism includes the motor, set firmly the master gear on the axis of rotation of motor, the assembly bearing is cup jointed to the periphery of axle sleeve, assembly bearing periphery cup joints the slave gear, the master gear with the slave gear tooth meshing is connected, the slave gear is through a plurality of support spring support load support section of thick bamboo.

In the above protrusion measuring instrument, the displacement sensor penetrates into the shaft sleeve from bottom to top, and the top sensing head of the displacement sensor abuts against the center of the bottom surface of the measuring pad.

In the above-mentioned protrusion quantity measuring instrument, the frame is including being parallel arrangement's roof, medium plate and bottom plate, the bottom plate with link firmly a plurality of spinal branchs down between the medium plate, the medium plate with link firmly a plurality of spinal branchs between the roof.

Compared with the prior art, the protrusion quantity measuring instrument has the following beneficial effects:

1. the standard component is arranged above the measuring pad and combined with an elastic floating structure below the measuring pad, so that the inner ring and the outer ring are pressurized in a stepping way during pressurization, the automatic adjustment loading process is realized, and meanwhile, the loading and unloading operation is simplified and the efficiency is improved.

2. The intelligent control motor automatically rotates, the rotating assembly cooperates with the displacement sensor to automatically read, the steps of reading, storing, analyzing and the like are completed by computer software, manual reading and shaking of the inner ring of the bearing are not needed, reading errors and manual subjective reading errors are avoided, and the measuring accuracy and reliability are further improved.

3. The loading part adopts the automatic loading pre-compaction of cylinder, need not artifical undulant lever and upset load piece, and the loading is more convenient, reduces the manpower, reduces measuring cost.

Drawings

Fig. 1 is a sectional view of the present bulge measuring instrument.

Fig. 2 is a first internal structural view of the present protrusion quantity measuring instrument.

Fig. 3 is a second internal structural diagram of the present protrusion quantity measuring instrument.

Fig. 4 is an external structural view of the present protrusion amount measuring instrument.

In the figure, 1, a pressurizing cylinder; 2. ceramic balls; 3. connecting sleeves; 4. a pressing shaft; 5. a lock nut; 6. a spring plate; 7. a pressurizing spring; 8. a pressing plate; 9. a thrust ball bearing; 10. a shaft collar mounting plate; 11. pressurizing a tool; 12. locking the end cover; 13. a guide post; 14. a measurement pad; 15. an outer gasket; 16. an outer cover; 17. a shaft sleeve; 18. a rotating bearing; 19. a support cylinder; 20. a limiting plate; 21. a displacement sensor; 22. a motor; 23. a main gear; 24. a slave gear; 25. assembling a bearing; 26. a support spring; 27. a top plate; 28. a middle plate; 29. a bottom plate; 30. an upper support column; 31. a lower support column; 32. a standard.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

As shown in fig. 1 to 4, the protrusion quantity measuring instrument comprises a frame, wherein a pressurizing mechanism and a material carrying component are arranged in the frame in a vertically opposite mode, the material carrying component is in driving connection through a rotating mechanism, the lower part of the material carrying component is abutted to a displacement sensor 21, and the displacement sensor 21 is in circuit connection with an industrial personal computer.

The pressurizing mechanism comprises a pressurizing cylinder 1, the pressurizing cylinder 1 stretches out and draws back to drive a pressurizing shaft 4, the pressurizing shaft 4 is movably sleeved with a shaft collar mounting plate 10, a thrust ball bearing 9, a pressing plate 8, a pressurizing spring 7, a spring plate 6 and a locking nut 5 from the bottom end to sequentially and upwards, a pressurizing tool 11 is fixedly attached to the bottom surface of the shaft collar mounting plate 10, the thrust ball bearing 9 is clamped between the pressing plate 8 and the shaft collar mounting plate 10 to form a three-body fixedly connected, the bottom end of the pressurizing spring 7 presses the top surface of the pressing plate 8, the top end of the pressurizing spring 7 is abutted to the bottom surface of the spring plate 6, and the locking nut 5 is in threaded locking fit with the pressurizing shaft 4.

The standard part 32 is pressed by the pressing tool 11, the shaft collar mounting plate 10, the thrust ball bearing 9 and the pressing plate 8 under gravity. The highest position of the spring plate 6 is limited by the lock nut 5, so that the pressing spring 7 presses the pressing plate 8 to form elastic pressure, and the tight fit of the integral pressing mechanism is realized.

The bottom end of a telescopic rod of the pressurizing cylinder 1 is fixedly connected with a pressurizing shaft 4 through a connecting sleeve 3, a ceramic ball 2 is clamped between the telescopic rod and the pressurizing shaft 4, and the ceramic ball 2 is positioned inside the connecting sleeve 3. The gap between the telescopic rod and the pressurizing shaft 4 in the connecting sleeve 3 is filled by the ceramic balls 2, and meanwhile, point contact connection is formed by utilizing spherical surfaces, so that compact assembly is realized, and synchronous lifting transmission is facilitated.

The bottom end of the pressurizing shaft 4 is fixedly provided with a locking end cover 12, the diameter of the locking end cover 12 is larger than that of the pressurizing shaft 4, the center of the shaft collar mounting plate 10 is provided with a countersunk hole, and the locking end cover 12 is embedded into the countersunk hole to form a limiting clamping connection. The locking end cover 12 is assembled to complete the assembly with the shaft collar mounting plate 10, so that the shaft collar mounting plate 10 is prevented from falling off; the pressing shaft 4 can be pressed down against the collar mounting plate 10.

At least two guide posts 13 are erected on the frame, at least two guide holes are correspondingly formed in the pressing plate 8, and the guide posts 13 penetrate through the guide holes to form sliding connection. When the pressurizing cylinder 1 drives the pressurizing shaft 4 to drive the shaft collar mounting plate 10, the thrust ball bearing 9 and the pressing plate 8 to lift, the pressing plate 8 slides up and down along the guide post 13, so that the stability of lifting action is ensured, and meanwhile, the deviation is avoided.

The material carrying assembly comprises a measuring pad 14, the top surface of the measuring pad 14 is provided with an annular step groove, the periphery of the measuring pad 14 is sleeved with an outer gasket 15, and the bottom of the measuring pad 14 is assembled in the frame through the rotating assembly in a switching mode. The annular step groove is matched with the inner ring structure of the standard component 32, and the standard component 32 is placed on the measuring pad 14 to form positioning assembly. The outer washer 15 is fixed to the frame, and the outer ring wall of the measuring pad 14 is in sliding connection with the inner ring wall of the outer washer 15, thereby not interfering with the rotation movement of the measuring pad 14.

The rotating assembly comprises an outer cover 16 fixedly arranged on the frame, a shaft sleeve 17 is fixedly arranged on the outer cover 16, a rotating bearing 18 is sleeved on the outer periphery of the shaft sleeve 17, a supporting cylinder 19 is sleeved on the outer periphery of the rotating bearing 18, a limiting plate 20 is fixedly arranged on the top edge of the shaft sleeve 17, an annular table top is arranged on the inner periphery of the supporting cylinder 19, the limiting plate 20 is arranged above the annular table top, and the measuring pad 14 is fixedly connected with the supporting cylinder 19. The swivel bearing 18 comprises a cage in the form of a cylinder, on which a number of balls are embedded. The shaft sleeve 17 is positioned below the limiting plate 20, the limiting plate 20 is a circular plate body, and a middle hole of the circular plate body is communicated with a cylinder cavity of the shaft sleeve 17 in a linking way.

The rotating mechanism comprises a motor 22, a main gear 23 is fixedly sleeved on the rotating shaft of the motor 22, an assembly bearing 25 is sleeved on the outer periphery of the shaft sleeve 17, a slave gear 24 is sleeved on the outer periphery of the assembly bearing 25, the main gear 23 is in tooth engagement connection with the slave gear 24, and the slave gear 24 supports the support cylinder 19 through a plurality of support springs 26. The main gear 23 is driven to rotate by the rotation shaft of the motor 22, the auxiliary gear 24 is driven to rotate by tooth meshing, and the supporting cylinder 19 and the measuring pad 14 are further driven to synchronously rotate. The master gear 23 and the slave gear 24 are assembled in the housing 16, and a protective effect is formed by the housing 16.

The displacement sensor 21 penetrates into the shaft sleeve 17 from bottom to top, and a top end sensing head of the displacement sensor 21 abuts against the center of the bottom surface of the measuring pad 14. As the measurement pad 14 rotates, data is acquired by the sensing head of the displacement sensor 21.

The frame includes roof 27, medium plate 28 and bottom plate 29 that are parallel arrangement, links firmly a plurality of lower pillars 31 between bottom plate 29 and the medium plate 28, links firmly a plurality of upper pillars 30 between medium plate 28 and the roof 27. The pressurizing cylinder 1 is fixedly arranged on the top plate 27, the outer cover 16 is fixedly arranged on the bottom surface of the middle plate 28, and the motor 22 is fixedly arranged below the middle plate 28. The guide posts 13 stand on the top surface of the middle plate 28. The middle plate 28 is provided with a circular through hole for assembling the measuring pad 14, the supporting cylinder 19, the shaft sleeve 17 and other parts. The displacement sensor 21 is erected at the center of the bottom plate 29 by being fixed.

The action mode of the protrusion quantity measuring instrument comprises the following steps:

A. idle state:

the standard component 32 is not placed on the measuring pad 14, the pressurizing cylinder 1 retracts the pressurizing shaft 4, and the pressurizing tool 11, the shaft collar mounting plate 10, the thrust ball bearing 9 and the pressing plate 8 are lifted synchronously; as the loading force is lost, the support spring 26 will relax and will jack up.

B. Calibration standard 32:

the calibration of the load is required before calibration of the standard 32 by replacing the standard 32 with a pressure sensor of similar shape to the standard 32, placing the sensor, and starting the calibration standard 32 procedure to bring the machine to the loaded state. Then the lock nut 5 is adjusted, so that the expansion and contraction amount of the pressurizing spring 7 is adjusted to achieve the purpose of adjusting the loading load.

1. The standard 32 is placed on the measurement pad 14 to mate with the annular step groove to form a locating assembly.

2. The pressurizing cylinder 1 is controlled to move downwards manually, the pressurizing tool 11, the shaft collar mounting plate 10, the thrust ball bearing 9 and the pressing plate 8 move downwards synchronously until the pressurizing tool 11 presses the inner ring of the standard part 32, the telescopic rod of the pressurizing cylinder 1 continuously presses the ceramic ball 2, so that the pressurizing shaft 4 is pressed to move downwards continuously, the pressurizing spring 7 is compressed to enable the locking end cover 12 to stretch downwards and be separated from the shaft collar mounting plate 10, and the loading force of the pressurizing cylinder 1 is transmitted to the standard part 32.

3. The standard part 32, the measuring pad 14 and the supporting cylinder 19 are integrally moved downwards to compress the supporting spring 26 through the action of loading force until the outer ring of the standard part 32 is pressed to the outer gasket 15, at the moment, the annular table surface of the supporting cylinder 19 is separated from the limiting plate 20, the sensing head of the displacement sensor 21 just contacts the measuring pad 14, and the pressurizing cylinder 1 just descends to the lower limit position.

4. And after loading in place, the industrial personal computer software is adjusted to set a zero position, and after the zero position is adjusted, the pressurizing cylinder 1 is started to move upwards to restore to an idle state.

C. Protrusion measurement:

1. the bearing is placed on the measuring pad 14 to mate with the annular step groove to form a locating assembly.

2. The electric control pressurizing cylinder 1 descends, the pressurizing tool 11, the shaft collar mounting plate 10, the thrust ball bearing 9 and the pressing plate 8 synchronously descend until the pressurizing tool 11 presses the inner ring of the bearing, the telescopic rod of the pressurizing cylinder 1 continuously presses the ceramic ball 2, the pressurizing shaft 4 is further pressed to move downwards, the pressurizing spring 7 is further compressed, the locking end cover 12 extends downwards and is separated from the shaft collar mounting plate 10, and at the moment, the loading force of the pressurizing cylinder 1 is transmitted to the bearing.

3. The bearing, the measuring pad 14 and the supporting cylinder 19 are integrally moved downwards to compress the supporting spring 26 through the action of loading force until the outer ring of the bearing is pressed to the outer gasket 15, at the moment, the annular table surface of the supporting cylinder 19 is separated from the limiting plate 20, the sensing head of the displacement sensor 21 just contacts the measuring pad 14, and the pressurizing cylinder 1 just descends to the lower limit position.

4. The starting motor 22 is meshed with the driven gear 24 through the main gear 23 to rotate, and further drives the supporting cylinder 19, the measuring pad 14 and the bearing inner ring to rotate at a constant speed, and the displacement sensor 21 collects data and uploads the data to the industrial personal computer for processing in the rotating process; after the set number of turns is reached, the motor 22 is automatically stopped, and then the pressurizing cylinder 1 is up-moved to the idle state, so that the measurement of one set of bearings is completed.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.

Although the pressurized cylinder 1 is used more herein; ceramic balls 2; a connecting sleeve 3; a pressing shaft 4; a lock nut 5; a spring plate 6; a pressurizing spring 7; a pressing plate 8; a thrust ball bearing 9; a collar mounting plate 10; a pressurizing tool 11; locking the end cap 12; a guide post 13; a measuring pad 14; an outer gasket 15; a housing 16; a sleeve 17; a rotating bearing 18; a support cylinder 19; a limiting plate 20; a displacement sensor 21; a motor 22; a main gear 23; a slave gear 24; assembling a bearing 25; a support spring 26; a top plate 27; a middle plate 28; a bottom plate 29; an upper pillar 30; a lower column 31; standard 32, etc., but does not exclude the possibility of using other terms. These terms are used merely for convenience in describing and explaining the nature of the utility model; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Claims

1. The utility model provides a protrusion quantity measuring instrument, includes the frame, its characterized in that, be upper and lower counter setting pressurizing mechanism and carrying the material subassembly in the frame, carrying the material subassembly to be connected by rotary mechanism drive, carrying the below butt displacement sensor of material subassembly, displacement sensor circuit connection industrial computer.

2. The protrusion measuring instrument of claim 1, wherein the pressurizing mechanism comprises a pressurizing cylinder, the pressurizing cylinder drives a pressurizing shaft in a telescopic manner, the pressurizing shaft is sequentially sleeved with a shaft collar mounting plate, a thrust ball bearing, a pressing plate, a pressurizing spring, a spring plate and a locking nut in an upward moving manner from the bottom end, a pressurizing tool is fixedly attached to the bottom surface of the shaft collar mounting plate, the thrust ball bearing is clamped between the pressing plate and the shaft collar mounting plate to form a three-body fixedly connected, the bottom end of the pressurizing spring presses the top surface of the pressing plate, the top end of the pressurizing spring abuts against the bottom surface of the spring plate, and the locking nut is in threaded locking fit with the pressurizing shaft.

3. The protrusion measuring instrument according to claim 2, wherein the bottom end of the telescopic rod of the pressurizing cylinder is fixedly connected with the pressurizing shaft through a connecting sleeve, a ceramic ball is clamped between the telescopic rod and the pressurizing shaft, and the ceramic ball is positioned in the connecting sleeve.

4. The protrusion measuring instrument according to claim 2, wherein a locking end cover is fixedly arranged at the bottom end of the pressurizing shaft, the diameter of the locking end cover is larger than that of the pressurizing shaft, a counter bore is formed in the center of the shaft collar mounting plate, and the locking end cover is embedded into the counter bore to form a limiting clamping connection.

5. The protrusion measuring instrument according to claim 2, wherein at least two guide posts are erected on the frame, at least two guide holes are correspondingly formed in the pressing plate, and the guide posts penetrate through the guide holes to form sliding connection.

6. The protrusion measuring instrument of claim 1, wherein the material carrying assembly comprises a measuring pad, the top surface of the measuring pad is provided with an annular step groove, the periphery of the measuring pad is sleeved with an outer gasket, and the bottom of the measuring pad is assembled in the frame in a transfer manner through a rotating assembly.

7. The protrusion measuring instrument of claim 6, wherein the rotating assembly comprises an outer cover fixedly mounted on the frame, a shaft sleeve is fixedly sleeved on the outer cover, a rotating bearing is sleeved on the outer periphery of the shaft sleeve, a supporting cylinder is sleeved on the outer periphery of the rotating bearing, a limiting plate is fixedly mounted on the top edge of the shaft sleeve, an annular table surface is arranged on the inner periphery of the supporting cylinder, the limiting plate is located above the annular table surface, and the measuring pad is fixedly connected with the supporting cylinder.

8. The protrusion measuring instrument according to claim 7, wherein the rotating mechanism comprises a motor, a main gear is fixedly sleeved on a rotating shaft of the motor, an assembly bearing is sleeved on the periphery of the shaft sleeve, a slave gear is sleeved on the periphery of the assembly bearing, the main gear is meshed with the slave gear, and the slave gear supports the supporting cylinder through a plurality of supporting springs.

9. The protrusion measuring instrument according to claim 7, wherein the displacement sensor penetrates into the shaft sleeve from bottom to top, and a top end sensing head of the displacement sensor abuts against a bottom center of the measuring mat.

10. The protrusion measuring instrument according to claim 1, wherein the frame comprises a top plate, a middle plate and a bottom plate which are arranged in parallel, a plurality of lower struts are fixedly connected between the bottom plate and the middle plate, and a plurality of upper struts are fixedly connected between the middle plate and the top plate.