CN118149019A - Bearing sleeve assembling instrument - Google Patents

Abstract

The invention discloses a bearing sleeve closing instrument, which belongs to the technical field of bearing sleeve closing equipment and comprises a workbench, wherein a clamping mechanism and a limiting mechanism are arranged on the workbench, the clamping mechanism comprises a movable clamping block and a fixed clamping block, the limiting mechanism comprises a lifting column, and a plurality of supporting plates are uniformly distributed on the side wall of the lifting column.

Description

Bearing sleeve assembling instrument

Technical Field

The invention relates to a bearing sleeve fitting instrument, and belongs to the technical field of bearing sleeve fitting equipment.

Background

In the small-batch multi-variety assembly process of the deep groove ball bearing, the clamping operation is usually carried out by relying on manpower, the method is high in labor intensity, is more influenced by human factors, is easy to cause abrasion of balls or channels, and further has adverse effects on product quality and assembly efficiency, and more importantly, after the bearing is sleeved, an additional detection process is needed to judge whether the clamping stagnation phenomenon exists in the bearing, so that the station and the cost are increased, the production efficiency is reduced, and therefore, the bearing sleeve-sleeving instrument is provided.

Disclosure of Invention

The invention aims to provide a bearing fit instrument for solving the problems in the background art.

In order to achieve the above purpose, the present invention adopts the following technical scheme: the bearing sleeve assembling instrument comprises a workbench, wherein a clamping mechanism and a limiting mechanism are arranged on the workbench;

the clamping mechanism comprises a movable clamping block and a fixed clamping block, the movable clamping block is connected to the upper surface of the workbench in a sliding manner, the fixed clamping block is fixed to the upper surface of the workbench and is positioned in the moving direction of the movable clamping block, a clamping space for clamping the outer ring of the bearing exists between the movable clamping block and the fixed clamping block, the inner ring of the bearing is placed in the outer ring of the bearing, one end of the workbench is fixedly provided with a first electric push rod, an output rod of the first electric push rod is connected to the side wall of the movable clamping block, and when the output rod of the first electric push rod pushes the movable clamping block to move towards the fixed clamping block, the movable clamping block and the fixed clamping block clamp the outer ring of the bearing and deform the bearing;

the limiting mechanism comprises a mounting plate, the mounting plate is connected to the lower surface of the workbench, a second electric push rod is mounted on the mounting plate, a lifting column is connected to an output rod of the second electric push rod, a plurality of supporting plates used for supporting the inner wall of the bearing inner ring are uniformly distributed on the side wall of the lifting column, the upper ends of the supporting plates are inclined, namely, the upper ends of the supporting plates incline downwards from one end close to the lifting column to one end far away from the lifting column, when the supporting plates are sleeved into the bearing inner ring from bottom to top, the inclined arrangement of the upper ends of the supporting plates can drive the inclined bearing inner ring to move so as to enable a driving bearing to be concentric with the lifting column, when the lifting column moves upwards with the supporting plates, the supporting plates are supported on the inner wall of the bearing inner ring, one side of the bearing inner ring is attached to the inner wall of the bearing outer ring, and a crescent groove is formed between the bearing inner ring and the bearing outer ring.

Preferably, a steel ball filling member is arranged above the clamping space, the steel ball filling member comprises a pressing plate and a steel ball ingress pipe, and the lower end of the steel ball ingress pipe is connected to the pressing plate.

Preferably, the clamping surfaces of the movable clamping block and the fixed clamping block adopt arc-shaped surfaces, and the radius of the arc-shaped surfaces is larger than the radius of the outer contour of the bearing outer ring.

Preferably, the upper edge of the clamping surface is provided with a protruding structure preventing the bearing outer race from tilting upwards.

Preferably, the lower surface of the workbench is provided with a sliding rail, the mounting plate is connected to the sliding rail in a sliding manner through a third electric push rod, the third electric push rod is fixed to the lower surface of the workbench, the end part of an output shaft of the third electric push rod is fixed to the mounting plate, when the third electric push rod operates, the third electric push rod can drive the mounting plate to slide on the sliding rail, an inner rod is connected to the second electric push rod in a rotating manner, the lifting column is sleeved on the inner rod, a plurality of key blocks II are fixedly connected to the outer wall of the inner rod, a plurality of key blocks I are fixedly connected to the inner wall of the lifting column, and a spring I is arranged between each adjacent key block II and each key block I;

the lower surface of the workbench is fixedly connected with a motor, an output shaft of the motor is fixedly connected with a driving wheel, the lower end of the inner rod is connected with a driven wheel, and when the mounting plate moves and carries the bearing inner ring to be concentric with the bearing outer ring through the supporting plate, the driven wheel is contacted with the driving wheel;

The upper end fixedly connected with contact one of interior pole, and the upper end of lift post is connected with contact two, and when lift post and interior pole compression spring one rotated, contact one contacted with contact two.

Preferably, the supporting plate is provided with a base plate, the inside of the base plate is connected with a jacking block in a sliding mode through a second spring, and when the supporting plate is supported in the bearing inner ring, the end portion of the jacking block is jacked on the inner wall of the bearing inner ring.

Preferably, the output shaft end part of the first electric push rod is connected with a screw rod, an adjusting nut is sleeved on the screw rod in a meshed mode, a connecting column is fixedly connected to the rear side wall of the movable clamping block, the end part of the screw rod is slidably connected to the inside of the connecting column, and a spring III is arranged on the screw rod and located between the adjusting nut and the connecting column.

Preferably, at least one guide rod is connected to the rear side wall of the movable clamping block, the length setting direction of the guide rod is parallel to the moving direction of the movable clamping block, a base is fixedly connected to the upper surface of the workbench, and the guide rod is sleeved on the side wall of the base.

Compared with the prior art:

1. According to the invention, by operating the first electric push rod, the output shaft of the first electric push rod pushes the movable clamping block to move towards the fixed clamping block, at the moment, the movable clamping block and the fixed clamping block clamp the bearing outer ring, the bearing outer ring is slightly deformed under the cooperation of the movable clamping block and the fixed clamping block, at the moment, the lower end of the steel ball ingress pipe is arranged right above the maximum width position of the crescent groove, and the steel balls smoothly enter the crescent groove, so that the steel balls are filled, the labor intensity of workers can be reduced, the crush injury caused to the bearing is reduced, and the quality of bearing sleeve fitting is improved.

2. According to the invention, the driven wheel is contacted with the driving wheel, the motor rotates through the driving wheel, the driven wheel rotates on the output shaft of the second electric push rod through the driving wheel, and then the lifting column and the supporting plate are driven to rotate, so that the supporting plate rotates with the bearing inner ring, when the bearing inner ring rotates smoothly, the contact I is not contacted with the contact II all the time, the bearing is qualified, otherwise, when the bearing inner ring rotates and is clamped, the contact I is contacted with the contact II when the lifting column rotates with the compression spring of the inner rod, the contact I is unqualified, and therefore the smoothness of the rotation after the bearing is detected, and the bearing which does not reach the standard is detected.

Drawings

Fig. 1 is a schematic view of a structure of a clamping mechanism for clamping an outer race of a bearing according to the present invention.

FIG. 2 is a cross-sectional view of a movable clamp block and a fixed clamp block of the present invention clamping a bearing outer race.

Fig. 3 is a schematic overall structure of the present invention.

Fig. 4 is a schematic structural view of the driven wheel and the driving wheel of the present invention when they are separated.

Fig. 5 is a diagram of the present invention.

Fig. 6 is a schematic structural view of the driven wheel and the driving wheel of the present invention when they are in contact.

Fig. 7 is a plan view of the bearing inner race and the bearing outer race of the present invention when concentric.

Fig. 8 is a schematic structural view of a limiting mechanism of the present invention.

Fig. 9 is a cross-sectional exploded view of the lifting column, gusset and inner bar of the present invention.

FIG. 10 is a cross-sectional view of the lifting column, key block one, inner bar, key block two and spring one of the present invention.

Fig. 11 is a schematic structural view of the press plate and steel ball inlet pipe of the present invention.

Fig. 12 is a schematic view of the three structures of the screw rod, the adjusting nut, the connecting column and the spring of the invention.

Fig. 13 is a cross-sectional view of three parts of the screw, adjustment nut, connecting post and spring of the present invention.

In the figure: 1. the device comprises a workbench, 2, a clamping mechanism, 201, a movable clamping block, 202, a fixed clamping block, 203, a first electric push rod, 3, a limiting mechanism, 301, a mounting plate, 302, a second electric push rod, 303, a lifting column, 304, a supporting plate, 305, a key block I, 4, a steel ball filling piece, 401, a pressing plate, 402, a steel ball ingress pipe, 5, a sliding rail, 6, a third electric push rod, 7, an inner rod, 701, a key block II, 8, a spring I, 9, a motor, 10, a driving wheel, 11, a driven wheel, 12, a contact I, 13, a contact II, 14, a substrate, 15, a spring II, 16, a top block, 17, a guide rod, 18, a base, 19, a screw rod, 20, an adjusting screw cap, 21, a connecting column, 22 and a spring III.

Detailed Description

The invention is illustrated below by means of specific examples, without however limiting the invention.

Example 1

As shown in fig. 1 to 13, in this embodiment, a bearing sleeve assembling apparatus is provided, which includes a workbench 1, and a clamping mechanism 2 and a limiting mechanism 3 are installed on the workbench 1;

The clamping mechanism 2 comprises a movable clamping block 201 and a fixed clamping block 202, the movable clamping block 201 is slidably connected to the upper surface of the workbench 1, the fixed clamping block 202 is fixed to the upper surface of the workbench 1 and is positioned in the moving positive direction of the movable clamping block 201, a clamping space for clamping the outer ring of a bearing exists between the movable clamping block 201 and the fixed clamping block 202, the inner ring of the bearing is placed in the outer ring of the bearing, one end of the workbench 1 is fixedly provided with a first electric push rod 203, an output rod of the first electric push rod 203 is connected to the side wall of the movable clamping block 201, and when the output rod of the first electric push rod 203 pushes the movable clamping block 201 to move towards the fixed clamping block 202, the movable clamping block 201 and the fixed clamping block 202 clamp the outer ring of the bearing and deform the outer ring of the bearing;

The limiting mechanism 3 comprises a mounting plate 301, the mounting plate 301 is connected to the lower surface of the workbench 1, a second electric push rod 302 is mounted on the mounting plate 301, a lifting column 303 is connected to an output rod of the second electric push rod 302, a plurality of supporting plates 304 used for supporting the inner wall of the bearing inner ring are uniformly distributed on the side wall of the lifting column 303, as shown in fig. 7, the upper ends of the supporting plates 304 are inclined, namely, the upper ends of the supporting plates 304 incline downwards from one end close to the lifting column 303 to one end far away from the lifting column 303, when the supporting plates 304 are sleeved into the bearing inner ring from bottom to top, the inclined bearing inner ring can be driven to move through the inclined arrangement of the upper ends of the supporting plates 304, so that a driving bearing and the lifting column 303 are in a concentric state, when the lifting column 303 moves upwards with the supporting plates 304, the supporting plates 304 are supported on the inner wall of the bearing inner ring, one side of the bearing inner ring is attached to the inner wall of the bearing inner ring, and a crescent groove is formed between the bearing inner ring and the bearing inner ring.

A steel ball filling member 4 is arranged above the clamping space, the steel ball filling member 4 comprises a pressing plate 401 and a steel ball ingress pipe 402, the lower end of the steel ball ingress pipe 402 is connected to the pressing plate 401,

The operation process of the clamping mechanism 2 and the limiting mechanism 3 is as follows:

Placing the bearing outer ring and the bearing inner ring in a clamping space, at the moment, operating a first electric push rod 203, and pushing the movable clamping block 201 to move towards the fixed clamping block 202 by an output shaft of the first electric push rod 203, at the moment, clamping the bearing outer ring by the movable clamping block 201 and the fixed clamping block 202, and at the same time, slightly deforming the bearing outer ring under the cooperation of the movable clamping block 201 and the fixed clamping block 202;

Then, the second electric push rod 302 is operated, the output shaft of the second electric push rod 302 pushes the lifting column 303 to move upwards, in the moving process of the lifting column 303, the lifting column 303 moves upwards with the supporting plate 304, at the moment, the supporting plate 304 is supported on the inner wall of the bearing inner ring, and a crescent groove is formed between the bearing inner ring and the bearing outer ring;

as shown in fig. 2, the maximum width value of the crescent groove is d, d is increased when the movable clamping block 201 and the fixed clamping block 202 are clamped to deform the outer ring of the bearing, and at the moment, the lower end of the steel ball ingress pipe 402 is arranged right above the maximum width position of the crescent groove (as shown in fig. 10), and the steel balls smoothly enter the crescent groove, so that the filling of the steel balls is completed;

After the steel balls are filled, the first electric push rod 203 is reset with the movable clamping block 201 to loosen the outer ring of the bearing, the second electric push rod 302 is moved downwards with the lifting column 303 to enable the supporting plate 304 to be separated from the inner ring of the bearing, and at the moment, the bearing sleeve assembling operation is completed;

As shown in fig. 10, the pressing plate 401 is lifted by using an external cylinder, when the pressing plate 401 moves down to approach the upper surfaces of the outer ring and the inner ring of the bearing, the pressing plate plays a role in preventing the inner ring of the bearing from falling off (the supporting plate 304 limits the inner ring of the bearing when entering the inner ring of the bearing from bottom to top), meanwhile, the pressing plate 401 is close to a crescent groove with the lower end of the steel ball ingress pipe 402, the upper end of the steel ball ingress pipe 402 is connected with a steel ball box, the steel ball box can automatically quantitatively convey steel balls to the steel ball ingress pipe 402 at a time, and after the bearing is closed, the pressing plate 401 can be moved up by using the external cylinder.

As shown in fig. 2 and 3, in order to enable the movable clamping block 201 and the fixed clamping block 202 to stably clamp the bearing outer ring, the clamping surfaces of the movable clamping block 201 and the fixed clamping block 202 adopt arc surfaces, and the radius of the arc surfaces is larger than the outer contour radius of the bearing outer ring, so that when the movable clamping block 201 and the fixed clamping block 202 clamp the bearing outer ring, a gap for deformation of the bearing outer ring is reserved between the arc surfaces and the bearing outer ring, and the gap allows the bearing outer ring to deform to a certain extent when being subjected to clamping force, without causing excessive pressure or friction between the clamping blocks and the bearing outer ring.

As shown in fig. 3, when the bearing outer ring is clamped, a protruding structure for preventing the bearing outer ring from tilting upward is provided on the upper edge of the clamping surface in order to stably clamp the bearing outer ring.

As shown in fig. 1 and 12, in order to enable the movable clamping block 201 to slide more stably, at least one guide rod 17 is connected to the rear side wall of the movable clamping block 201, the length setting direction of the guide rod 17 is parallel to the moving direction of the movable clamping block 201, a base 18 is fixedly connected to the upper surface of the workbench 1, and the guide rod 17 is sleeved on the side wall of the base 18.

Example 2

As shown in fig. 3-9, in order to detect whether a clamping stagnation phenomenon exists on the basis of embodiment 1, in this embodiment, in order to detect the smoothness of rotation after bearing sleeve, a sliding rail 5 is provided on the lower surface of the workbench 1, an installation plate 301 is slidably connected to the sliding rail 5 through a third electric push rod 6, the third electric push rod 6 is fixed on the lower surface of the workbench 1, the end of an output shaft of the third electric push rod 6 is fixed on the installation plate 301, when the third electric push rod 6 runs, the third electric push rod 6 can drive the installation plate 301 to slide on the sliding rail 5, an inner rod 7 is rotatably connected to a second electric push rod 302, a lifting column 303 is sleeved on the inner rod 7, a plurality of key blocks two 701 are fixedly connected to the outer wall of the inner rod 7, a plurality of key blocks one 305 are fixedly connected to the inner wall of the lifting column 303, and a spring one 8 is provided between the adjacent key blocks two 701 and the key block one 305;

The lower surface of the workbench 1 is fixedly connected with a motor 9, an output shaft of the motor 9 is fixedly connected with a driving wheel 10, the lower end of the inner rod 7 is connected with a driven wheel 11, and when the mounting plate 301 moves and carries the bearing inner ring to be concentric with the bearing outer ring through the supporting plate 304, the driven wheel 11 is contacted with the driving wheel 10;

The upper end of the inner rod 7 is fixedly connected with a first contact 12, the upper end of the lifting column 303 is connected with a second contact 13, and when the lifting column 303 and the inner rod 7 compress the first spring 8 to rotate, the first contact 12 is contacted with the second contact 13;

As shown in fig. 6, at this time, the lifting column 303, the bearing inner ring and the bearing outer ring are in a coaxial state (as shown in fig. 5), at this time, the driven wheel 11 is in contact with the driving wheel 10, at this time, after the motor 9 operates, the motor 9 drives the driven wheel 11 to rotate through the driving wheel 10, so that the driven wheel 11 drives the inner rod 7 to rotate on the output shaft of the second electric push rod 302 (the inner rod 7 rotates along the arrow direction as shown in fig. 9), during the rotation process of the inner rod 7, the lifting column 303 and the supporting plate 304 can be driven to rotate through the cooperation of the key block two 701, the spring one 8 and the key block one 305, so that the supporting plate 304 can rotate with the bearing inner ring, when the bearing inner ring rotates smoothly, the contact one 12 is always not contacted with the contact two 13, and the bearing sleeve is qualified, otherwise, when the bearing inner ring rotates and is blocked, the lifting column 303 and the inner rod 7 compresses the spring one 8, the contact one 12 is contacted with the contact two 13, and the rotating performance after the bearing sleeve is detected, and the bearing sleeve is not qualified is detected, and the bearing is detected smoothly is detected.

In addition, as shown in fig. 11, the workbench 1 is provided with a through hole for sliding the lifting column 303 and the supporting plate 304, the shape of the through hole is adapted to the shape of the lifting column 303 and the supporting plate 304, in order to ensure that the lifting column 303 and the supporting plate 304 slide smoothly in the through hole, the lifting column 303 and the supporting plate 304 rotate in a whole circle, for example, during detection, the motor 9 rotates for ten circles with the lifting column 303 and the supporting plate 304 to stop, and at this time, the angles of the lifting column 303 and the supporting plate 304 are still at the initial angle positions with the through hole;

When the clamping stagnation phenomenon occurs, the motor 9 stops continuously rotating, and meanwhile, the motor 9 drives the lifting column 303 and the supporting plate 304 to reversely rotate and reset to an initial state, for example, when the detection is performed, the clamping stagnation phenomenon occurs when the lifting column 303 and the supporting plate 304 rotate for half a circle, and after the contact one 12 contacts the contact two 13, the motor 9 drives the lifting column 303 and the supporting plate 304 to reversely rotate for half a circle and reset to the initial state;

A controller is additionally arranged on the workbench 1, and the controller controls the motor 9, the first electric push rod 203, the second electric push rod 302 and the third electric push rod 6 to run and receives and feeds back signals when the first contact 12 is contacted with the second contact 13 so as to complete automatic operations of bearing sleeve fitting and detecting whether the bearing sleeve fitting is qualified or not.

As shown in fig. 7-9, in order to make the supporting plate 304 support the bearing inner ring better, the supporting plate 304 is provided with the base plate 14, the inside of the base plate 14 is slidably connected with the top block 16 through the second spring 15, when the supporting plate 304 is supported in the bearing inner ring, the end of the top block 16 is propped against the inner wall of the bearing inner ring, when the end of the top block 16 is propped against the inner wall of the bearing inner ring, the second spring 15 is in a compressed state, and under the elastic action of the second spring 15, the top block 16 generates a force for propping the bearing inner ring, so that the bearing inner ring can be better supported, and when the lifting column 303 rotates, the supporting plate 304 is also beneficial to rotating with the bearing inner ring.

As shown in fig. 12 and 13, in order to buffer the clamped bearing outer ring, the end of the output shaft of the first electric push rod 203 is connected with a screw rod 19, an adjusting nut 20 is engaged and sleeved on the screw rod 19, a connecting column 21 is fixedly connected on the rear side wall of the movable clamping block 201, the end of the screw rod 19 is slidably connected inside the connecting column 21, a third spring 22 is arranged on the screw rod 19 and between the adjusting nut 20 and the connecting column 21, under the condition that the output end stroke of the first electric push rod 203 is fixed, the clamping force of the movable clamping block 201 and the fixed clamping block 202 on the bearing outer ring can be adjusted by adjusting the position of the adjusting nut 20 on the screw rod 19, the clamping stability of the bearing outer ring is ensured, and after the third spring 22 is additionally arranged, under the spring three spring 22, the action, the movable clamping block 201 is always abutted against the outer wall of the bearing outer ring under the action of the spring three spring 22, the abutting force is reduced, the bearing deformation is restored, and the smooth rotation of the bearing outer ring is detected again under the condition.

Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention and not for limiting the technical solution of the present invention, and although the present invention has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the present invention may be modified or equivalently replaced without departing from the spirit and scope of the present invention, and any modification or partial replacement thereof should be included in the scope of the claims of the present invention.

Claims (8)

1. The bearing sleeve assembling instrument is characterized by comprising a workbench (1), wherein a clamping mechanism (2) and a limiting mechanism (3) are arranged on the workbench (1);

the clamping mechanism (2) comprises a movable clamping block (201) and a fixed clamping block (202), the fixed clamping block (202) is fixed on the upper surface of the workbench (1) and is positioned in the moving direction of the movable clamping block (201), a clamping space for clamping the bearing outer ring exists between the movable clamping block (201) and the fixed clamping block (202), a first electric push rod (203) is fixedly arranged at one end of the workbench (1), an output rod of the first electric push rod (203) is connected to the side wall of the movable clamping block (201), and when the output rod of the first electric push rod (203) pushes the movable clamping block (201) to move towards the fixed clamping block (202), the movable clamping block (201) and the fixed clamping block (202) clamp the bearing outer ring and deform the bearing outer ring;

Stop gear (3) are including mounting panel (301), install second electric putter (302) on mounting panel (301), be connected with elevating column (303) on the output pole of second electric putter (302), evenly distributed has a plurality of fagging (304) that are used for propping on the bearing inner race inner wall on the lateral wall of elevating column (303), when elevating column (303) carry fagging (304) to upwards remove, fagging (304) prop on the bearing inner race inner wall, and one side laminating of bearing inner race is on the bearing outer race inner wall, forms the crescent moon groove between its bearing inner race and the bearing outer race.

2. The bearing fit instrument according to claim 1, wherein a steel ball filling member (4) is arranged above the clamping space, the steel ball filling member (4) comprises a pressing plate (401) and a steel ball ingress pipe (402), and the lower end of the steel ball ingress pipe (402) is connected to the pressing plate (401).

3. The bearing fit instrument according to claim 1, wherein the clamping surfaces of the movable clamping block (201) and the fixed clamping block (202) are arc-shaped surfaces, and the radius of the arc-shaped surfaces is larger than the radius of the outer contour of the bearing outer ring.

4. A bearing fit instrument according to claim 3, wherein the upper edge of the clamping surface is provided with a projection arrangement which prevents the bearing outer race from tilting upwards.

5. The bearing fit instrument according to claim 1, wherein a sliding rail (5) is arranged on the lower surface of the workbench (1), the mounting plate (301) is slidably connected to the sliding rail (5) through a third electric push rod (6), an inner rod (7) is rotatably connected to the second electric push rod (302), the lifting column (303) is sleeved on the inner rod (7), a plurality of key blocks II (701) are fixedly connected to the outer wall of the inner rod (7), a plurality of key blocks I (305) are fixedly connected to the inner wall of the lifting column (303), and a spring I (8) is arranged between each adjacent key block II (701) and each key block I (305);

The lower surface of the workbench (1) is fixedly connected with a motor (9), an output shaft of the motor (9) is fixedly connected with a driving wheel (10), the lower end of the inner rod (7) is connected with a driven wheel (11), and when the mounting plate (301) moves and carries the bearing inner ring to be concentric with the bearing outer ring through the supporting plate (304), the driven wheel (11) is contacted with the driving wheel (10);

The upper end of the inner rod (7) is fixedly connected with a first contact (12), the upper end of the lifting column (303) is connected with a second contact (13), and when the lifting column (303) and the inner rod (7) compress the first spring (8) to rotate, the first contact (12) is contacted with the second contact (13).

6. The bearing fit instrument according to claim 5, wherein the supporting plate (304) is provided with a base plate (14), the inside of the base plate (14) is slidably connected with a top block (16) through a second spring (15), and when the supporting plate (304) is supported in the bearing inner ring, the end part of the top block (16) is pressed against the inner wall of the bearing inner ring.

7. The bearing fit instrument according to claim 5 or 6, characterized in that an output shaft end of the first electric push rod (203) is connected with a screw rod (19), an adjusting nut (20) is engaged and sleeved on the screw rod (19), a connecting column (21) is fixedly connected on a rear side wall of the movable clamping block (201), an end of the screw rod (19) is slidably connected inside the connecting column (21), and a spring III (22) is arranged on the screw rod (19) and located between the adjusting nut (20) and the connecting column (21).

8. The bearing fit instrument according to claim 1, wherein at least one guide rod (17) is connected to the rear side wall of the movable clamping block (201), a base (18) is fixedly connected to the upper surface of the workbench (1), and the guide rod (17) is sleeved on the side wall of the base (18).