CN219234841U

CN219234841U - Double-valve seat match-grinding machine

Info

Publication number: CN219234841U
Application number: CN202320802309.7U
Authority: CN
Inventors: 朱章远
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-04-12
Filing date: 2023-04-12
Publication date: 2023-06-23
Anticipated expiration: 2033-04-12

Abstract

The utility model discloses a double-valve-seat grinding machine, which belongs to the technical field of grinding equipment and comprises a base (1), wherein a clamping disc (2) is arranged on the base (1), the clamping disc (2) rotates under the drive of a first driving mechanism (3), a bottom plate (5) is arranged between the clamping discs (2), a swinging mechanism (6) for driving the bottom plate (5) to do reciprocating swinging motion is arranged on the base (1), a first clamping mechanism (7) and a second clamping mechanism (8) and a third driving mechanism (9) for driving a ball body to rotate are arranged on the bottom plate (5), and the first clamping mechanism (7) and the second clamping mechanism (8) are respectively driven by a fourth driving mechanism (10) and a fifth driving mechanism (11) to do opposite motion.

Description

Double-valve seat match-grinding machine

Technical Field

The utility model belongs to the technical field of grinding equipment, and particularly relates to a double-valve-seat matched grinding machine for mutually grinding a valve-seat contact surface and the outer surface of a sphere.

Background

The ball valve is driven by valve rod to make the ball body of opening-closing member rotate around the axis of ball valve, and has the functions of cutting off, distributing and changing medium flow direction in pipeline, and can be tightly closed only by means of 90 deg. rotation operation and small rotation moment. The sealing performance and the service life of the ball valve are determined by the matching precision and form and position tolerance between the ball body and the valve seat, and the conventional processing technology generally comprises the steps of forging to form blanks, and polishing the ball body and the valve seat to enable the ball body and the valve seat to be attached to each other.

The utility model patent with the application number of CN202121617527.0 discloses a sealing surface grinding tool for a valve core and a valve seat in a ball valve, which comprises a grinding circular ring disc and an eccentric rotating disc, wherein the center of the upper part of the grinding circular ring disc is vertically and fixedly connected with a grinding disc connecting rod; the eccentric rotary disk is fixedly connected with a drilling machine spindle of the drilling machine through an eccentric disk connecting rod, an eccentric hole is formed in the eccentric rotary disk, and the eccentric hole is elastically sleeved on the grinding disk connecting rod; when the ball valve is used, the ball valve core is fixed on a drilling platform of the drilling machine, the drilling spindle of the drilling machine drives the eccentric rotary disc to rotate through the eccentric disc connecting rod, the eccentric rotary disc drives the grinding ring disc to eccentrically rotate through the sleeve of the eccentric hole and the grinding disc connecting rod, the grinding ring disc drives the ball valve seat to rotate, and the ball valve seat contacts and rotates with the corresponding surface of the ball valve core fixed on the drilling platform to form a sealing surface.

Firstly, in the grinding tool, a ball body is fixed on a drilling machine platform, and only a valve seat rotates, so that the valve seat can only contact and grind the outer surface of a part of the ball body, the grinding is not in place, the sphere fit degree and precision between the contact surface of the valve seat and the outer surface of the ball body cannot be ensured, and finally the tightness of the ball valve can be influenced; secondly, the grinding tool can only grind between a spheroid and a disk seat at a time, and the case of ball valve comprises a spheroid and two disk seats usually, therefore utilize this grinding tool to grind not only work efficiency is low, and can't guarantee the uniformity between two disk seat contact surfaces to can't realize exchanging.

Disclosure of Invention

The utility model aims to solve the technical problems that in the prior art, the working efficiency of a grinding tool is low, grinding is not in place, complete fit between a valve seat contact surface and the outer surface of a ball body cannot be ensured, the sealing performance of a ball valve is ensured, and the like.

In order to solve the technical problems, the utility model provides a double-valve seat grinding machine, which comprises a base, wherein clamping discs for fixing valve seats are oppositely arranged on the base, the clamping discs are driven by a first driving mechanism to rotate and are driven by a second driving mechanism to move towards a ball body, a bottom plate is arranged between the clamping discs along the horizontal direction, the bottom plate is in rotating fit with the base, a swinging mechanism for driving the bottom plate to do reciprocating swinging motion is arranged on the base, a first clamping mechanism and a second clamping mechanism for fixing the ball body and a third driving mechanism for driving the ball body to rotate are arranged on the bottom plate, and the first clamping mechanism and the second clamping mechanism are oppositely arranged along the horizontal direction and are respectively driven by a fourth driving mechanism and a fifth driving mechanism to do opposite motion.

As a further improvement measure of the utility model, the swinging mechanism comprises a connecting rod, a rotating disc and a driving mechanism six for driving the rotating disc to rotate, wherein an installation groove is formed in the rotating disc along the radial direction of the rotating disc, an adjusting rod is arranged in the installation groove, an adjusting piece is arranged on the adjusting rod and moves along the axial direction of the adjusting rod, one end of the connecting rod is in rotating fit with the adjusting piece, and the other end of the connecting rod is hinged with the bottom plate through a pin shaft.

As a further improvement measure of the utility model, the lower surface of the bottom plate is connected with a rotating shaft, the rotating shaft is arranged along the longitudinal direction, a first mounting hole corresponding to the rotating shaft is formed in the base, and a shaft sleeve is arranged between the first mounting hole and the rotating shaft.

As a further improvement measure of the utility model, the first clamping mechanism comprises a first box body, a first main shaft and a first center, a first through hole for the first main shaft to pass through is formed in the first box body, a first bearing is arranged between the first through hole and the first main shaft, the first center is arranged at one end of the first main shaft facing the second clamping mechanism, and the output end of the third driving mechanism is connected with one end of the first main shaft far away from the second clamping mechanism.

As a further improvement measure of the utility model, the second clamping mechanism comprises a second box body, a second main shaft and a second center, wherein a second through hole for the second main shaft to pass through is formed in the second box body, a second bearing is arranged between the second through hole and the second main shaft, and the second center is arranged at one end of the second main shaft, which faces the second clamping mechanism.

As a further improvement measure of the utility model, the upper surface of the bottom plate is connected with a carriage, the carriage moves along the horizontal direction under the drive of a driving mechanism seven, the first box body and the second box body are respectively in sliding fit with the carriage, the driving mechanism four and the driving mechanism five are respectively arranged on the carriage, and the output ends of the driving mechanism four and the driving mechanism five are respectively connected with the first box body and the second box body.

As a further improvement measure of the utility model, a guide rail is arranged on one side surface of the clamping disc, which faces the sphere, along the radial direction of the clamping disc, the guide rails are sequentially distributed along the circumferential direction of the clamping disc, a fixing piece is arranged on the guide rail in a sliding manner, and the fixing piece slides from the outer edge of the clamping disc to the inner circle of the clamping disc under the driving of the driving mechanism eight.

As a further improvement measure of the utility model, the base is provided with a box body III, a through hole III for the spindle III to pass through is formed in the box body III, a bearing III is arranged between the through hole III and the spindle III, the clamping disc is arranged at one end of the spindle III facing the sphere, and the output end of the driving mechanism I is connected with one end of the spindle III far away from the sphere.

Compared with the prior art, the utility model has the beneficial effects that: 1. according to the utility model, the two opposite clamping plates, the first clamping mechanism and the second clamping mechanism are arranged on the base, so that the two valve seats and the outer surface of the ball body can be simultaneously ground, the production efficiency is effectively improved, the consistency of the contact surfaces of the two valve seats after grinding is ensured, and the exchange can be realized; 2. the swing mechanism is arranged in the ball valve, so that the ball body swings left and right while rotating along the radial direction of the ball valve, and the valve seat rotates forward or reversely along the axial direction of the ball valve, so that the contact grinding between the contact surface of the valve seat and different parts of the outer surface of the ball body is ensured, the grinding precision and the sphere fitting degree between the valve seat and the ball body are ensured, the tightness of the ball valve after the ball valve is assembled is ensured, and the service life of the ball valve is prolonged; 3. the utility model can adjust the distance between the first clamping mechanism and the second clamping mechanism and the horizontal position of the first clamping mechanism and the second clamping mechanism according to spheres with different sizes and sizes, can also adjust the horizontal height and the horizontal position of the clamping plates, has wide applicability and flexible use.

Drawings

Fig. 1 is a perspective view of the present utility model.

Fig. 2 is a front view of the present utility model.

Fig. 3 is a left side view of the present utility model.

Fig. 4 is an enlarged perspective view of the swing mechanism in the present utility model.

Fig. 5 is an enlarged plan view of the swing mechanism in the present utility model.

Fig. 6 is an enlarged perspective view of the base plate, the first chuck and the second chuck in the present utility model.

Fig. 7 is an enlarged left side view of the base plate, first chuck and second chuck of the present utility model.

Fig. 8 is an enlarged perspective view of one of the chuck and the housing three of the present utility model.

FIG. 9 is a second enlarged perspective view of the chuck and the third housing of the present utility model.

Fig. 10 is an enlarged front view of the chuck and the housing three of the present utility model.

Reference numerals illustrate: the clamping device comprises a base, a clamping chuck, a 3-driving mechanism I, a 4-driving mechanism II, a 5-bottom plate, a 6-swinging mechanism, a 7-clamping mechanism I, a 8-clamping mechanism II, a 9-driving mechanism III, a 10-driving mechanism IV, a 11-driving mechanism V, a 12-connecting rod, a 13-rotating disk, a 14-driving mechanism VI, a 15-mounting groove, a 16-adjusting rod, a 17-adjusting piece, a 18-rotating shaft, a 19-shaft sleeve, a 20-box I, a 21-main shaft I, a 22-top I, a 23-box II, a 24-main shaft II, a 25-top II, a 26-carriage, a 27-driving mechanism seven, a 28-guide rail, a 29-fixing piece, a 30-box III, a 31-main shaft III, a 32-bulge, a 33-clamping groove, a 35-adjusting plate, a 36-adjusting seat, a 38-guide rail I, a 39-driving mechanism IV, a 40-slide rail I, a 41-slide I, a 42-slide II, a 43-slide II and a 44-guide block II.

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

On the contrary, the utility model is intended to cover any alternatives, modifications, equivalents, and variations as may be included within the spirit and scope of the utility model as defined by the appended claims. Further, in the following detailed description of the present utility model, certain specific details are set forth in order to provide a better understanding of the present utility model. The present utility model will be fully understood by those skilled in the art without the details described herein.

It is noted that when a connection between two elements is referred to as being "fixed," the two elements may be directly connected or intervening elements may also be present. The terms "horizontal," "upper," "lower," and the like are used herein for illustrative purposes only.

As shown in fig. 1, 3 and 9, the double-valve seat grinding machine comprises a base 1, wherein clamping discs 2 for fixing valve seats are oppositely arranged on the base 1, and the clamping discs 2 rotate under the drive of a first driving mechanism 3 and move towards the direction of a ball body under the drive of a second driving mechanism 4. The side surface of the clamping disc 2 facing the sphere is provided with guide rails 28 along the radial direction of the side surface, and in the embodiment, the number of the guide rails 28 is set to be 4, and the guide rails are sequentially and uniformly distributed along the circumferential direction of the clamping disc 2; as other solutions, the number of guide rails 28 may be set to 3, 5 or 6, which is adjusted according to the actual needs.

As shown in fig. 9, the guide rail 28 is slidably provided with a fixing member 29, in this embodiment, the inner wall of the guide rail 28 is provided with protrusions 32 along the radial direction of the clamping disk 2, two sides of the fixing member 29 are respectively provided with a clamping groove 33 corresponding to the protrusions 32, and the clamping grooves 33 and the protrusions 32 can be in clamping fit to ensure connection between the fixing member 29 and the clamping disk 2. The fixing piece 29 is provided with an L-shaped step surface towards one side surface of the valve seat, and the fixing piece 29 slides from the outer edge of the clamping disc 2 to the inner circle of the clamping disc 2 under the driving of the driving mechanism eight, so that the step surface is respectively attached to the outer edge surface and the side surface of the valve seat to clamp the valve seat. The driving mechanism eight is arranged as an air cylinder, and the output value of the driving mechanism eight can be adjusted according to the diameter of the valve seat so as to adapt to the installation and fixation of the valve seats with different sizes and sizes, and the valve seat has more flexibility.

As shown in fig. 8 to 10, in order to realize the installation and fixation of the chuck 2, a third box 30 is provided on the base 1, a third through hole through which a third spindle 31 passes is provided in the third box 30, a third bearing is provided between the third through hole and the third spindle 31, and the chuck 2 is provided at one end of the third spindle 31 facing the sphere. The first driving mechanism 3 is fixed on the third box 30, and the output end of the first driving mechanism is connected with one end of the third main shaft 31, which is far away from the sphere. The first driving mechanism 3 is set as a motor, the third bearing can ensure that the third main shaft 31 rotates relative to the third box 30 under the drive of the first driving mechanism 3, and the clamping disc 2 is driven to rotate through the rotation of the third main shaft 31, so that the rotation of the valve seat is finally realized.

A height adjusting mechanism is arranged between the third box body 30 and the base 1, the height adjusting mechanism comprises an adjusting plate 35 and an adjusting seat 36, the third box body 30 is fixed on the upper surface of the adjusting plate 35, the lower surface of the adjusting plate 35 is provided with an inclined surface I, a guide block I is arranged on the inclined surface I along the driving direction of the driving mechanism II 4, the upper surface of the adjusting seat 36 is provided with an inclined surface II, a guide rail I38 which is in sliding fit with the guide block I is arranged on the inclined surface II, and the adjusting plate 35 is driven to slide on the guide rail I38 through a driving mechanism III 39 fixed on the adjusting seat 36 to drive the third box body 30 and the chuck 2 to horizontally move.

Since the thickness of the adjusting plate 35 gradually decreases from the direction toward the ball to the direction away from the ball and the thickness of the adjusting seat 36 gradually increases from the direction toward the ball to the direction away from the ball, when the adjusting plate 35 moves toward the ball, the overall height of the adjusting plate 35 and the adjusting seat 36 is made shorter; when the adjusting plate 35 moves away from the sphere, the overall height of the adjusting plate 35 and the adjusting seat 36 becomes high, so that the horizontal heights of the box III 30 and the clamping disc 2 are affected, and the valve seat can correspond to spheres with different sizes.

In order to ensure the precision of the horizontal movement of the third box body 30, a first slide rail 40 is arranged on the base 1 along the driving direction of the second driving mechanism 4, a first slide block 41 is arranged on the lower surface of the adjusting seat 36, the second driving mechanism 4 is a servo motor, the output end of the second driving mechanism is connected with the adjusting seat 36, and the adjusting seat 36 is driven to move along the axial direction of the first slide rail 40 while the adjusting plate 35, the third box body 30 and the clamping disc 2 are driven to move towards the direction of the sphere until the contact surface of the valve seat on the clamping disc 2 contacts with the outer surface of the sphere.

As shown in fig. 1, 6 and 7, a bottom plate 5 is arranged between the clamping plates 2 along the horizontal direction, the lower surface of the bottom plate 5 is connected with a rotating shaft 18, the rotating shaft 18 is arranged along the longitudinal direction, a first mounting hole corresponding to the rotating shaft 18 is formed in the base 1, a shaft sleeve 19 is arranged between the first mounting hole and the rotating shaft 18, and the rotating fit between the bottom plate 5 and the base 1 is realized through the rotating fit between the shaft sleeve 19 and the rotating shaft 18.

As shown in fig. 1 and 2, a first clamping mechanism 7 and a second clamping mechanism 8 for fixing the ball and a third driving mechanism 9 for driving the ball to rotate are arranged on the bottom plate 5, and the first clamping mechanism 7 and the second clamping mechanism 8 are oppositely arranged along the horizontal direction and are driven by a fourth driving mechanism 10 and a fifth driving mechanism 11 to move in opposite directions respectively.

As shown in fig. 1, 6 and 7, the first clamping mechanism 7 comprises a first box 20, a first main shaft 21 and a first center 22, a first through hole for the first main shaft 21 to pass through is formed in the first box 20, a first bearing is arranged between the first through hole and the first main shaft 21, the first center 22 is arranged at one end of the first main shaft 21, which faces towards the second clamping mechanism 8, a third driving mechanism 9 is fixed on the first box 20, the output end of the third driving mechanism 9 is connected with one end, far away from the second clamping mechanism 8, of the first main shaft 21, the third driving mechanism 9 is arranged as a motor, and the first bearing can ensure that the first main shaft 21 rotates relative to the first box 20 under the drive of the third driving mechanism 9; the second clamping mechanism 8 comprises a second box body 23, a second main shaft 24 and a second center 25, a second through hole for the second main shaft 24 to pass through is formed in the second box body 23, a second bearing is arranged between the second through hole and the second main shaft 24, the first bearing can ensure that the second main shaft 24 rotates relative to the first box body 20, and the second center 25 is arranged at one end of the second main shaft 24, which faces the second clamping mechanism 8.

The center I22 and the center II 25 are respectively abutted against two ends of the sphere, the center I22 is driven to rotate through rotation of the main shaft I21, so that the sphere is driven to rotate, and the center II 25 and the main shaft II 24 are driven to synchronously rotate through rotation of the sphere. The ball body rotates along the radial direction of the ball body, the valve seat rotates along the axial direction of the ball body, and grinding agents are added between the ball body and the valve seat, so that the ball body and the valve seat are mutually contacted and ground, and the sphere fit degree and sphere roundness between the ball body and the valve seat are improved.

As shown in fig. 1, 4 and 5, a swinging mechanism 6 for driving the bottom plate 5 to do reciprocating swinging motion is arranged on the base 1, the swinging mechanism 6 comprises a connecting rod 12, a rotating disc 13 and a driving mechanism six 14 for driving the rotating disc 13 to rotate, the driving mechanism six 14 is arranged as a motor and is fixed on the base 1, and the output end of the driving mechanism six 14 is connected with the center position of the rotating disc 13. The rotary disk 13 is internally provided with a mounting groove 15 along the radial direction thereof, the mounting groove 15 is internally provided with an adjusting rod 16, and the adjusting rod 16 is provided with an adjusting piece 17.

The rotating disc 13 rotates clockwise or anticlockwise according to a certain angle by controlling the output value of the driving mechanism six 14, the regulating piece 17 moves along the axial direction of the regulating rod 16, one end of the connecting rod 12 is in running fit with the regulating piece 17, the other end of the connecting rod 12 is hinged with the bottom plate 5 through the pin shaft, so that the regulating piece 17 can influence the inclination angle of the connecting rod 12 between the bottom plate 5 and the rotating disc 13 in the moving process, and the bottom plate 5 is pulled or pushed to rotate around the rotating shaft 18 by a small extent, so that the bottom plate 5 can drive the clamping mechanism 7I and the clamping mechanism II 8 to swing reciprocally, the ball body rotates along the radial direction of the ball body, the contact surface of the valve seat is contacted with the outer surface of each part of the ball body and is completely attached, no gap exists between the ground valve seat and the ball body, the tightness after the ball valve is ensured, and the service life of the ball valve is prolonged.

As shown in fig. 6 and 7, a second slide rail 42 is provided on the upper surface of the bottom plate 5 along the horizontal direction, a second slide block 43 is provided on the second slide rail 42, a carriage 26 is provided on the second slide block 43, the carriage 26 moves along the horizontal direction under the drive of a seventh driving mechanism 27, the seventh driving mechanism 27 is provided as a servo motor and is fixed on the bottom plate 5, and the output end of the servo motor is connected with the carriage 26 for adjusting the horizontal positions of the first clamping mechanism and the second clamping mechanism so that the ball corresponds to the valve seat.

The upper surface of the carriage 26 is provided with a second guide block 44 along the horizontal direction, as a scheme, the lower surface of the first box body 20 is provided with a second guide rail which slides in a matched manner with the second guide block 44, and the lower surface of the second box body 23 is provided with a third guide rail which slides in a matched manner with the second guide block 44; alternatively, the first sliding plate and the second sliding plate are slidably arranged on the second guide block 44, the first box 20 is fixed on the first sliding plate to realize sliding fit with the carriage 26, and the second box 23 is fixed on the second sliding plate to realize sliding fit with the carriage 26. The driving mechanism IV 10 and the driving mechanism V11 are respectively provided with servo motors, and are respectively arranged on the carriage 26, and the output ends of the driving mechanisms IV and V are respectively connected with the first box 20 and the second box 23.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the embodiments described above, and it will be apparent to those skilled in the art that various modifications and improvements can be made therein without departing from the scope of the utility model.

Claims

1. The double-valve-seat matched grinding machine comprises a base (1), and is characterized in that clamping discs (2) used for fixing valve seats are oppositely arranged on the base (1), the clamping discs (2) rotate under the driving of a first driving mechanism (3) and move towards a ball body direction under the driving of a second driving mechanism (4), a bottom plate (5) is arranged between the clamping discs (2) along the horizontal direction, the bottom plate (5) is in rotary fit with the base (1), a swinging mechanism (6) used for driving the bottom plate (5) to do reciprocating swinging motion is arranged on the base (1), a first clamping mechanism (7) and a second clamping mechanism (8) used for fixing the ball body are arranged on the bottom plate (5), and a third driving mechanism (9) used for driving the ball body to rotate are arranged on the bottom plate (5) in a relative mode along the horizontal direction, and do opposite motions under the driving of a fourth driving mechanism (10) and a fifth driving mechanism (11) respectively.

2. The double-valve-seat grinding machine according to claim 1, wherein the swinging mechanism (6) comprises a connecting rod (12), a rotating disc (13) and a driving mechanism six (14) for driving the rotating disc (13) to rotate, a mounting groove (15) is formed in the rotating disc (13) along the radial direction of the rotating disc, an adjusting rod (16) is arranged in the mounting groove (15), an adjusting piece (17) is arranged on the adjusting rod (16), the adjusting piece (17) moves along the axial direction of the adjusting rod (16), one end of the connecting rod (12) is in running fit with the adjusting piece (17), and the other end of the connecting rod (12) is hinged with the bottom plate (5) through a pin shaft.

3. The double-valve seat grinding machine according to claim 2, wherein the lower surface of the bottom plate (5) is connected with a rotating shaft (18), the rotating shaft (18) is arranged along the longitudinal direction, a first mounting hole corresponding to the rotating shaft (18) is formed in the base (1), and a shaft sleeve (19) is arranged between the first mounting hole and the rotating shaft (18).

4. The double-valve-seat matched grinding machine according to claim 3, wherein the first clamping mechanism (7) comprises a first box body (20), a first main shaft (21) and a first center (22), a first through hole for the first main shaft (21) to pass through is formed in the first box body (20), a first bearing is arranged between the first through hole and the first main shaft (21), the first center (22) is arranged at one end, facing the second clamping mechanism (8), of the first main shaft (21), and the output end of the third driving mechanism (9) is connected with one end, far away from the second clamping mechanism (8), of the first main shaft (21).

5. The double-valve seat grinding machine according to claim 4, wherein the second clamping mechanism (8) comprises a second box body (23), a second main shaft (24) and a second center (25), a second through hole for the second main shaft (24) to pass through is formed in the second box body (23), a second bearing is arranged between the second through hole and the second main shaft (24), and the second center (25) is arranged at one end, facing the second clamping mechanism (8), of the second main shaft (24).

6. The double-valve seat grinding machine according to claim 5, wherein the upper surface of the bottom plate (5) is connected with a carriage (26), the carriage (26) is driven by a driving mechanism seven (27) to move along the horizontal direction, the first box body (20) and the second box body (23) are respectively in sliding fit with the carriage (26), the driving mechanism four (10) and the driving mechanism five (11) are respectively installed on the carriage (26), and the output ends of the driving mechanism four (10) and the driving mechanism five (11) are respectively connected with the first box body (20) and the second box body (23).

7. The double-valve-seat grinding machine according to claim 6, wherein a guide rail (28) is arranged on one side surface of the clamping disc (2) facing the sphere along the radial direction of the clamping disc, the guide rails (28) are sequentially distributed along the circumferential direction of the clamping disc (2), a fixing piece (29) is slidably arranged on the guide rails (28), and the fixing piece (29) slides from the outer edge of the clamping disc (2) to the inner circle of the clamping disc (2) under the driving of the driving mechanism eight.

8. The double-valve seat grinding machine according to claim 7, wherein a box body III (30) is arranged on the base (1), a through hole III for a spindle III (31) to pass through is formed in the box body III (30), a bearing III is arranged between the through hole III and the spindle III (31), the clamping disc (2) is arranged at one end, facing the sphere, of the spindle III (31), and the output end of the driving mechanism I (3) is connected with one end, far away from the sphere, of the spindle III (31).