CN220270317U - Bearing play measuring device - Google Patents

Abstract

The utility model discloses a bearing clearance measuring device which is used for measuring axial clearance of an angular contact ball bearing after being installed in a pairing way, the bearing is provided with a bearing outer ring, the bearing clearance measuring device comprises a connecting mechanism, a driving mechanism and a measuring mechanism, the connecting mechanism is respectively and limitedly connected with two bearing outer rings of the bearing after being installed in a pairing way, the driving mechanism is connected with the connecting mechanism and is used for driving the connecting mechanism to move so as to enable the bearing outer rings to axially move, and the measuring mechanism is used for measuring the axial movement distance of the bearing outer rings. The bearing clearance measuring device is easy to install, the purpose of measuring the axial clearance of the bearing can be achieved through the installation measuring mechanism and the operation method after the double-row angular contact ball bearing is installed, the size is small, the weight is light, the bearing clearance measuring device is convenient to carry and install on site, and the bearing clearance measuring device is simple to install and convenient to operate.

Description

Bearing play measuring device

Technical Field

The utility model relates to the field of bearing clearance measurement, in particular to a bearing clearance measurement device.

Background

The internal bearing play is defined as the total distance the bearing outer race is movable in the radial (radial play) or axial (axial play) direction relative to the bearing inner race. The single-row angular contact ball bearing can only bear axial loads acting in one direction, and when in use, the two bearings are usually abutted against each other. Mating bearing application: when the load carrying capacity of a single bearing is insufficient, it may be used in a tandem configuration, and when it is to be subjected to a combined load or an axial load acting in both directions, it may be used in a back-to-back or face-to-face configuration.

The motor non-drive end has used two angular contact ball bearings that are listed as, two are listed as the bearing and are installed to the pump shaft for heating, install the back through fastening lock nut control two rows of bearing's mounted position and fastening, two are listed as angular contact ball bearings and need guarantee certain axial play after the installation (according to the bearing accessible bearing manual inquiry specific numerical value of different sizes), if the axial play of reserving after the installation is less or be zero, the bearing during operation will generate heat, work will seriously influence the life-span of bearing at higher temperature, if the axial play of reserving is great, motor rotor will take place vibration trouble, also can influence the life-span of bearing and the safety of motor.

Under the prior art, the motor overhauls and installs the bearing mainly relies on the following two methods to approximate the purpose that reaches the assurance axial play:

method 1: and measuring the size from the bearing lock nut to the motor shaft head in the disassembly process, and carrying out the assembly according to the disassembly measured value in the assembly process. There are disadvantages: (1) The accuracy is insufficient, and the dimensional change of the bearing can influence the positioning size because of the difference of the thickness of the spare parts of the bearing; (2) The measurement error of the positioning size of the lock nut is larger than the error of the axial clearance of the bearing; (3) If the axial clearance of the bearing after the bearing is installed before the disassembly is wrong, the defect always exists due to the original installation size and the safety and the stability of the equipment are affected.

Method 2: and (3) installing the bearing to a rotor, integrally installing the bearing into a motor bearing chamber, and upwards jacking the rotor at the motor driving end through a jack, and monitoring a change value on the end face and the shaft of the motor non-driving end bearing by using a dial indicator so as to measure the residual axial play of the motor non-driving end bearing. There are disadvantages: (1) The weight of the motor rotor is about 5000kg, the rotor is jacked up by a jack, the method is heavy, and the industrial safety risk is high; (2) And after the rotor penetrates back to the stator, the residual clearance is measured, if the axial clearance is found to be unsuitable and needs to be adjusted, the whole motor rotor needs to be disassembled again to be adjusted, and the overhaul period and the workload are increased.

Disclosure of Invention

The utility model aims to provide a bearing clearance measuring device.

The technical scheme adopted for solving the technical problems is as follows: a bearing play measuring device for measuring an axial play after mating installation of angular contact ball bearings is constructed, comprising:

the connecting mechanism is in limit connection with two bearing outer rings of the bearings after the paired installation respectively;

the driving mechanism is connected with the connecting mechanism and is used for driving the connecting mechanism to move so as to axially move the bearing outer ring of the bearing;

and the measuring mechanism is used for measuring the axial movement distance of the bearing outer ring.

In some embodiments, the plurality of first stoppers are fixedly arranged at one end of the push-pull cylinder, and the bottoms of the first stoppers protrude from the inner wall surface of the push-pull cylinder and are in abutting connection with the first end surface of the bearing outer ring;

an outward outer blocking part is formed on one end, far away from the first blocking piece, of the push-pull barrel, a plurality of second blocking pieces are arranged on one side, facing away from the first blocking piece, of the outer blocking part, the third fastening pieces are arranged on one side, facing towards the first blocking piece, of the outer blocking part, the second blocking pieces and the first blocking pieces are arranged in a staggered mode, and the bottoms of the second blocking pieces protrude out of the inner wall surface of the push-pull barrel and are in butt joint with the second end surface of the bearing outer ring;

the driving mechanism is connected with the push-pull cylinder and the third fastening piece.

In some embodiments, a plurality of through threaded holes are formed in two ends of the push-pull cylinder, and the first stop block and the second stop block are in threaded connection with the through threaded holes of the push-pull cylinder through first fasteners.

In some embodiments, the outer blocking portion is formed outwards on two ends of the push-pull cylinder, and the through threaded hole is formed in the outer blocking portion.

In some embodiments, the bearing play measuring device further comprises a positioning mechanism, wherein the positioning mechanism comprises a fixed disc, the fixed disc is connected with a shaft body arranged in the bearing through a second fastener, and a preset gap is arranged between the fixed disc and the push-pull cylinder;

the driving mechanism is arranged on the fixed disc.

In some embodiments, the driving mechanism includes a plurality of adjusting members, a first end of each adjusting member is disposed on the fixed disk, a second end of each adjusting member is connected to the push-pull cylinder, and each adjusting member is capable of moving relative to the fixed disk in an axial direction.

In some embodiments, a first through hole is formed in the push-pull cylinder, a second through hole corresponding to the first through hole is formed in the fixed disc, a first end of the adjusting piece is arranged through the second through hole, a second end of the adjusting piece is arranged through the first through hole, and the adjusting piece is fixed with the push-pull cylinder through the third fastening piece;

the first through hole is a threaded hole, and the second through hole is a unthreaded hole.

In some embodiments, the adjustment member is a screw threaded with both the push-pull barrel and the third fastener; the driving mechanism further comprises a first fixing piece and a second fixing piece, the first fixing piece and the second fixing piece are in threaded connection with the adjusting piece, the first fixing piece is arranged on one side of the fixing disc, which faces the push-pull cylinder, and the second fixing piece is arranged on one side of the fixing disc, which faces away from the push-pull cylinder.

In some embodiments, the first stop and/or the second stop are each multiple and uniformly distributed along the circumferential direction; alternatively, the first stop block and/or the second stop block are annular.

In some embodiments, the measuring mechanism comprises a measurer, the measurer is arranged on one side of the bearing outer ring, and a pointer of the measurer presses on the end face of the bearing outer ring.

The implementation of the utility model has the following beneficial effects: the bearing clearance measuring device is easy to install, the purpose of measuring the axial clearance of the bearing can be achieved through the installation measuring mechanism and the operation method after the double-row angular contact ball bearing is installed, the size is small, the weight is light, the bearing clearance measuring device is convenient to carry and install on site, and the bearing clearance measuring device is simple to install and convenient to operate.

Drawings

In order to more clearly illustrate the technical solution of the present utility model, the following description will be given with reference to the accompanying drawings and examples, it being understood that the following drawings only illustrate some examples of the present utility model and should not be construed as limiting the scope, and that other related drawings can be obtained from these drawings by those skilled in the art without the inventive effort. In the accompanying drawings:

FIG. 1 is a schematic illustration of a bearing play measurement device in some embodiments of the utility model;

FIG. 2 is a schematic left-hand view of the structure of a push-pull cartridge in some embodiments of the present utility model;

FIG. 3 is a schematic right-side view of a push-pull cartridge according to some embodiments of the present utility model;

fig. 4 is a schematic view of the structure of the first stopper in some embodiments of the utility model.

Detailed Description

For a clearer understanding of technical features, objects and effects of the present utility model, a detailed description of embodiments of the present utility model will be made with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are configured and operated in specific directions based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model, and do not indicate that the apparatus or element to be referred to must have specific directions, and thus should not be construed as limiting the present utility model.

It should also be noted that unless explicitly stated or limited otherwise, terms such as "mounted," "connected," "secured," "disposed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or one or more intervening elements may also be present. The terms "first," "second," "third," and the like are used merely for convenience in describing the present utility model and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby features defining "first," "second," "third," etc. may explicitly or implicitly include one or more such features. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1 to 4, the utility model discloses a bearing play measuring device for measuring axial play after paired installation of angular contact ball bearings, wherein two bearings 1 respectively have a bearing outer ring 11 and a bearing inner ring, the bearings 1 can be installed on a condensate pump motor, the problem of insufficient load bearing capacity of a single bearing 1 can be avoided after paired installation, and the two bearings 1 are adjacently arranged. The bearing clearance measuring device comprises a connecting mechanism 2, a driving mechanism 3 and a measuring mechanism, wherein the connecting mechanism 2 is connected with a bearing 1 after being installed in a matched mode, particularly is in limit connection with bearing outer rings 11 of the two bearings 1, the driving mechanism 3 is connected with the connecting mechanism 2 and is used for driving the connecting mechanism 2 to move so as to enable the two bearing outer rings 11 to axially move synchronously, and the measuring mechanism is used for measuring the axial movement distance of the bearing outer rings 11, namely the axial clearance.

It can be understood that the bearing clearance measuring device is easy to install, the purpose of measuring the axial clearance of the bearing can be realized through the installation measuring mechanism and the operation method after the double-row angular contact ball bearing is installed, the size is small, the weight is light, the carrying and the site installation are convenient, and the installation of the bearing clearance measuring device is simple and the operation is convenient.

Specifically, the connection mechanism 2 includes a push-pull cylinder 21 sleeved on the peripheral wall of the bearing outer ring 11, a plurality of first stoppers 22, a plurality of second stoppers 23 and a plurality of third fasteners 63, wherein the plurality of first stoppers 22 are fixedly arranged at one end of the push-pull cylinder 21, the bottom of each first stopper 22 protrudes out of the inner wall surface of the push-pull cylinder 21 and is in contact with the first end surface of the bearing outer ring 11, an outward blocking part is formed at one end, far away from the first stoppers 22, of the push-pull cylinder 21, the plurality of second stoppers 23 are arranged at one side, facing away from the first stoppers 22, of the outer blocking part, the third fasteners 63 are arranged at one side, facing the first stoppers 22, of the outer blocking part, the second stoppers 23 are arranged in a staggered manner with the first stoppers 22, and the bottom of each second stopper 23 protrudes out of the inner wall surface of the push-pull cylinder 21 and is in contact with the second end surface of the bearing outer ring 11, so that the first stoppers 22 and the second stoppers 23 simultaneously limit the two bearing outer rings 11 in a bidirectional manner. The driving mechanism 3 is connected to the push-pull cylinder 21 and the third fastener 63.

It will be appreciated that the push-pull barrel 21 is generally cylindrical with an inner diameter slightly larger than the outer diameter of the bearing outer race 11, and that the push-pull barrel 21 is relatively movable with respect to the bearing outer race 11 by its arcuate inner wall to effect axial positioning of the push-pull barrel 21. The first stop block 22 and the second stop block 23 are in a fan-shaped plate structure, the outer ring part of the first stop block 22 and the second stop block 23 are attached to the upper end part of the push-pull cylinder 21, and the inner ring part is matched with the end face of the bearing outer ring 11, so that the stress area between the first stop block 22 and the second stop block 23 and the bearing outer ring 11 is larger, and the stability and the firmness in the moving process of the bearing outer ring 11 are ensured. Also, when the push-pull cylinder 21 is forced to move, the first stop block 22 or the second stop block 23 can push the bearing outer ring 11 to move.

The first stop 22 and the second stop 23 may be multiple and uniformly distributed along the circumferential direction in order to ensure uniform stress of the bearing outer race 11. In this embodiment, the number of the first stoppers 22 and the second stoppers 23 is preferably 3, the 3 first stoppers 22 and the second stoppers 23 are circumferentially and uniformly distributed on the end surface of the push-pull barrel 21, and in other embodiments, the number and the arrangement of the first stoppers 22 and the second stoppers 23 can be adjusted according to practical situations, for example, the first stoppers 22 and the second stoppers 23 can also be annular.

Further, the first stop block 22 and the second stop block 23 are both connected to the push-pull cylinder 21 through the first fastening member 61, through threaded holes 211 through which the first fastening member 61 can pass are provided at two ends of the push-pull cylinder 21, that is, the two ends of the push-pull cylinder 21 are both formed with the outer blocking portion outwards, the through threaded holes 211 are provided on the outer blocking portion, and the first fastening member 61 can be a fixing screw. In other embodiments, the first fastening member 61 may be a clip member or the like, as long as the first stopper 22 and the second stopper 23 can be stably connected to both ends of the push-pull cylinder 21 and can abut against the end face of the bearing outer ring 11, and the present utility model is not limited thereto.

The bearing clearance measuring device further comprises a positioning mechanism 5, wherein the positioning mechanism 5 comprises a fixed disc 51, the fixed disc 51 is connected with a shaft body 12 arranged in the bearing 1 through a second fastener 62, and a preset clearance is arranged between the fixed disc 51 and the push-pull cylinder 21. The fixed disk 51 has a substantially disk shape, and has an outer diameter larger than that of the bearing outer ring 11 and a gap with the end surface of the bearing outer ring 11 to provide a certain space distance for the movement of the bearing outer ring 11. The second fastener 62 is preferably a set screw.

The driving mechanism 3 includes a plurality of adjusting members 31, a first end of each adjusting member 31 is disposed on the fixed disc 51, a second end of each adjusting member 31 is connected to the push-pull cylinder 21, and the adjusting members 31 can move axially relative to the fixed disc 51. Specifically, the push-pull cylinder 21 is provided with a first through hole 212, the fixed plate 51 is provided with a second through hole 511 corresponding to the first through hole 212, and the first through hole 212 and the second through hole 511 are coaxially arranged. The first end of the adjusting member 31 is disposed through the second through hole 511, the second end of the adjusting member 31 is disposed through the first through hole 212, and the adjusting member 31 is fixed to the push-pull cylinder 21 by the third fastening member 63, i.e. the second end of the adjusting member 31 is disposed through the first through hole 212 and is fixedly connected to the push-pull cylinder 21 by the third fastening member 63 located at one side of the push-pull cylinder 21 near the first stop 22.

The first through hole 212 is a threaded hole, and the second through hole 511 is a light hole. It will be appreciated that the number of the first through holes 212 and the second through holes 511 is identical to the number of the first stoppers 22 and the second stoppers 23, and that the first through holes 212 and the second through holes 511 are coaxially arranged to ensure that the driving mechanism 3 is uniformly stressed when moving, and that the driving mechanism 3 is easily installed. That is, the third fastening member 63 and the second stopper 23 clamp the outer stopper of the push-pull cylinder 21 from the axial sides, respectively, and the adjusting member 31 is used to push the third fastening member 63 and the second stopper 23 back and forth in the axial direction, that is, to push the push-pull cylinder 21 back and forth.

In order to ensure that the driving mechanism 3 applies a uniform force to the push-pull cylinder 21, the first through holes 212 and the adjusting members 31 are preferably multiple and uniformly distributed along the axial direction. As shown in fig. 3, the first through holes 212 and the through screw holes 211 are alternately distributed in the circumferential direction.

In an embodiment, the adjusting member 31 may be preferably a screw passing through the fixed disk 51, the push-pull cylinder 21 and the third fastening member 63, and the third fastening member 63 and the push-pull cylinder 21 are each screw-coupled with the screw. The connecting mechanism 2 can be moved by rotating the adjusting member 31 to drive the bearing outer ring 11 to the limit position, and the adjusting member 31 can be manually moved or rotated by a manual tool, or the adjusting member 31 can be rotated by an external driver, which is not particularly limited herein.

In this embodiment, the driving mechanism 3 further includes a first fixing member 32 and a second fixing member 33, the first fixing member 32 and the second fixing member 33 are both in threaded connection with the adjusting member 31, and the first fixing member 32 and the second fixing member 33 are both coaxially disposed with the adjusting member 31, the first fixing member 32 is disposed on a side of the fixing plate 51 facing the push-pull cylinder 21, and the second fixing member 33 is disposed on a side of the fixing plate 51 facing away from the push-pull cylinder 21. In this application, with the side of the bearing 1 facing away from the fixed disk 51 being the first side, and the side of the bearing 1 facing toward the fixed disk 51 being the second side, when the first fixing member 32 is unscrewed, the adjusting member 31 may pull the bearing outer ring 11 to the second side limiting position through the first stopper 22 when the second fixing member 33 is screwed, and when the first fixing member 32 is screwed, the second fixing member 33 is unscrewed, the adjusting member 31 may pull the bearing outer ring 11 to the first side limiting position through the second stopper 23. Preferably, the first fixing member 32 and the second fixing member 33 are nuts.

Further, the measuring mechanism includes a measuring device, the measuring device is disposed on one side of the bearing outer ring 11, and a pointer of the measuring device is pressed on an end surface of the bearing outer ring 11, and the measuring device is used for measuring a distance between the first side limiting position and the second side limiting position of the push-pull cylinder 21, and the distance is used as an axial gap between two bearings. Preferably, the number of the measuring devices is also two, and the measuring devices are respectively arranged on the outer side and the inner side of the bearing 1 and can be respectively installed through the seat body, and when the two measuring devices are adopted, the readings of the two measuring devices can be averaged, so that a more accurate axial play value is obtained. By means of the measured actual axial play value, it can be determined whether the bearing 1 has a reasonable axial play value, so that a normal and reliable operation of the bearing 1 is ensured.

The measuring device can be a dial indicator or a dial indicator, so that the whole measuring process is direct reading, error accumulation caused by repeated measurement is omitted, the accuracy can reach 0.01mm when the dial indicator is used, and if the dial indicator is used, the accuracy can reach 0.001mm, and the accuracy is the same order of magnitude as the clearance measuring value of the bearing 1. In other embodiments, more precise measuring instruments such as three-coordinate measuring machines may also be used for measurements.

The specific installation method of the bearing clearance measuring device comprises the following steps:

1. the push-pull cylinder 21 is sleeved outside the two-row angular contact ball bearings, the first check block 22 is fixed on the push-pull cylinder 21 by using the first fastener 61, and the second check block 23 is fixed on the push-pull cylinder 21 by using the first fastener 61;

2. the adjusting member 31 is screwed into the push-pull cylinder 21 and locked by the third fastener 63, the first fixing member 32 is screwed onto the adjusting member 31, the adjusting member 31 is passed through the second through hole 511 of the fixing plate 51, and the fixing plate 51 is fixed to the shaft body 12 by the second fastener 62;

3. screwing the second fixing member 33 into the regulating member 31 and holding the first fixing member 32 and the second fixing member 33 against the fixing plate 51;

4. a measurer is arranged on the inner side or the outer side of the bearing 1, and a pointer of the measurer abuts against the end face of the bearing outer ring 11.

The measuring method of the bearing clearance measuring device comprises the following steps:

1. unscrewing the first fixing piece 32, screwing the second fixing piece 33, pulling the push-pull cylinder 21 to the second side through the adjusting piece 31, pulling the bearing outer ring 11 to the second side limiting position through the first stop block 22 by the push-pull cylinder 21, and reading L1 through the measurer;

2. unscrewing the second fixing piece 33, screwing the first fixing piece 32, pushing the push-pull cylinder 21 to the first side through the adjusting piece 31, pulling the bearing outer ring 11 to the first side limiting position through the second stop block 23 by the push-pull cylinder 21, and reading L2 through the measurer;

3. calculating a change value L of the measurer, wherein L=L2-L1, and the change value L is the axial play of the angular contact ball bearing after the paired installation;

4. repeating the steps 1 to 3, and increasing the operation error by taking the average value of the measurement.

The bearing play measuring device has the beneficial effects that:

1. the process innovation is initiated by establishing a detachable cylinder body outside the two-row angular contact ball bearing, and pushing and pulling the cylinder body 21 to reach the limit position of the relative motion of the bearing outer ring 11 and the inner ring, so as to measure the axial play of the angular contact ball bearing after the pairing installation;

2. the bearing clearance measuring device is easy to install and easy to measure, the bearing clearance measuring device can measure after the bearing 1 is installed only by installing a special tool, and the measured result is compared with the standard in time so as to adjust the axial clearance after the angular contact ball bearing is installed in a matched mode to be within a qualified range, the whole rotor is not required to be installed in the stator bearing 1 chamber and then measured, the industrial safety risk is reduced, and the time for drawing through the rotor because of adjustment is also reduced;

3. the measuring precision is high, the dial indicator is used as a measuring tool in the embodiment, the whole process is direct reading, error accumulation caused by multiple measurement is omitted, the precision can reach 0.01mm, and if the dial indicator is used, the precision can reach 0.001mm, and the measured value of the clearance of the bearing 1 is in the same order of magnitude;

4. the volume is small, the weight is light, and the portable mobile device is convenient to carry and install on site;

5. the precision of the installation process of the angular contact ball bearing is improved, and the quality hidden trouble caused by too small residual clearance (high bearing temperature) or too large residual clearance (high equipment vibration) in the installation process due to the fact that the angular contact ball bearing is installed by experience in the paired use process is avoided;

6. the industrial safety risk is reduced, the safety of operators is guaranteed, in the previous experience, if the residual clearance after the bearing installation is required to be measured, the rotor is required to be transmitted into the motor, the motor rotor is jacked up through the jack, the industrial safety risk is high, the adjustment is not easy after the measurement is completed, the industrial safety risk is reduced after the tool and the scheme are introduced, and the adjustment can be timely performed after the difference is found through measurement.

It is to be understood that the above examples only represent preferred embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the utility model; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the utility model; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims (10)

1. A bearing play measuring device for measuring an axial play after mating installation of angular contact ball bearings, comprising:

the connecting mechanism (2) is in limit connection with two bearing outer rings (11) of the bearing (1) after the paired installation respectively;

a driving mechanism (3) connected with the connecting mechanism (2) and used for driving the connecting mechanism (2) to move so as to axially move the bearing outer ring (11) of the bearing (1);

and the measuring mechanism is used for measuring the axial movement distance of the bearing outer ring (11).

2. The bearing play measuring device according to claim 1, characterized in that the connecting mechanism (2) comprises a push-pull cylinder (21) sleeved on the peripheral wall of the bearing outer ring (11), a plurality of first stoppers (22), a plurality of second stoppers (23) and a plurality of third fasteners (63);

the first stop blocks (22) are fixedly arranged at one end of the push-pull cylinder (21), and the bottoms of the first stop blocks (22) protrude out of the inner wall surface of the push-pull cylinder (21) and are in abutting connection with the first end surface of the bearing outer ring (11);

an outward blocking part is formed on one end, far away from the first blocking piece (22), of the push-pull barrel (21), a plurality of second blocking pieces (23) are arranged on one side, facing away from the first blocking piece (22), of the outward blocking part, a plurality of third fastening pieces (63) are arranged on one side, facing towards the first blocking piece (22), of the outward blocking part, the second blocking pieces (23) and the first blocking piece (22) are arranged in a staggered mode, and the bottoms of the second blocking pieces (23) protrude out of the inner wall surface of the push-pull barrel (21) and are in butt joint with the second end surface of the bearing outer ring (11);

the driving mechanism (3) is connected with the push-pull cylinder (21) and the third fastening piece (63).

3. Bearing play measuring device according to claim 2, characterized in that the push-pull cylinder (21) is provided with a number of through-going threaded holes (211) at both ends, the first stop (22) and the second stop (23) being both screwed with the through-going threaded holes (211) of the push-pull cylinder (21) by means of a first fastener (61).

4. A bearing play measuring device according to claim 3, characterized in that the outer stop is formed outwardly on both ends of the push-pull cylinder (21), and the through-threaded hole (211) is provided in the outer stop.

5. Bearing play measuring device according to claim 2, characterized in that it further comprises a positioning mechanism (5), said positioning mechanism (5) comprising a fixed disc (51), said fixed disc (51) being connected to a shaft body (12) provided in said bearing (1) by means of a second fastener (62), and a predetermined gap being provided between said fixed disc (51) and said push-pull cylinder (21);

the driving mechanism (3) is arranged on the fixed disc (51).

6. Bearing play measuring device according to claim 5, characterized in that the drive mechanism (3) comprises several adjustment members (31), a first end of the adjustment members (31) being provided to the stationary disc (51), a second end of the adjustment members (31) being connected to the push-pull cylinder (21), the adjustment members (31) being movable in axial direction relative to the stationary disc (51).

7. The bearing play measuring device according to claim 6, wherein a first through hole (212) is formed in the push-pull cylinder (21), a second through hole (511) corresponding to the first through hole (212) is formed in the fixed disc (51), a first end of the adjusting member (31) is arranged through the second through hole (511), a second end of the adjusting member (31) is arranged through the first through hole (212), and the adjusting member (31) is fixed with the push-pull cylinder (21) through the third fastening member (63);

the first through hole (212) is a threaded hole, and the second through hole (511) is a light hole.

8. Bearing play measuring device according to claim 6, characterized in that the adjusting member (31) is a screw rod which is in threaded connection with both the push-pull cylinder (21) and the third fastener (63);

the driving mechanism (3) further comprises a first fixing piece (32) and a second fixing piece (33), the first fixing piece (32) and the second fixing piece (33) are in threaded connection with the adjusting piece (31), the first fixing piece (32) is arranged on one side of the fixing disc (51) facing the push-pull cylinder (21), and the second fixing piece (33) is arranged on one side of the fixing disc (51) facing away from the push-pull cylinder (21).

9. Bearing play measuring device according to claim 2, characterized in that the first stop (22) and/or the second stop (23) are each a plurality and are evenly distributed in the circumferential direction; alternatively, the first stop (22) and/or the second stop (23) are annular.

10. Bearing play measuring device according to any one of claims 1 to 9, characterized in that the measuring means comprise a measuring device which is provided on one side of the bearing outer ring (11) and whose pointer presses against the end face of the bearing outer ring (11).