CN108723984B

CN108723984B - Spherical grinding clamp applied to CA6140 lathe

Info

Publication number: CN108723984B
Application number: CN201810539998.0A
Authority: CN
Inventors: 谭兴强
Original assignee: Panzhihua University
Current assignee: Panzhihua University
Priority date: 2018-05-30
Filing date: 2018-05-30
Publication date: 2020-04-21
Anticipated expiration: 2038-05-30
Also published as: CN108723984A

Abstract

The invention discloses a spherical grinding clamp applied to a CA6140 lathe, which comprises a base, wherein a sliding seat in sliding fit with the base and a driving mechanism for driving the sliding seat to slide are arranged on the base, a clamp main shaft and a power mechanism are arranged on the sliding seat, the power mechanism is in transmission connection with the clamp main shaft, one end of the clamp main shaft is connected with a clamping mechanism, the end surface of the other end of the clamp main shaft is provided with an eccentric column, the center line of the eccentric column is parallel to the center line of the clamp main shaft, the distance between the center line of the eccentric column and the center line of the clamp main shaft is greater than 0, and the eccentric column is connected with; and one end of the base, which is close to the clamping mechanism, is provided with a mounting structure which can be in running fit with the lathe. The spherical grinding clamp can be used on a CA6140 lathe, a grinder does not need to be customized, and the grinding cost is favorably reduced.

Description

Spherical grinding clamp applied to CA6140 lathe

Technical Field

The invention relates to the field of machining equipment, in particular to a spherical grinding clamp applied to a CA6140 lathe.

Background

In recent years, the plunger pump has been widely used due to the high pressure trend of the positive displacement hydraulic transmission. The leakage of the oil distribution mechanism of the plunger pump and the abrasion of the sliding surface are important to the service life of the plunger pump. It can be derived from the experience of the use of face seals that the method of using mechanical face seals in the oil distribution mechanism is not very good and the seals must be designed according to the hydraulic principle. Thus, an oil film with a certain thickness is formed between the cylinder body and the plane of the oil distribution disc to prevent metal from directly contacting, so that the cylinder body has certain floating capacity, and flexible connection is needed, so that the center of a connecting part is arranged near the neutral plane of the plunger spherical hinge to reduce the tilting moment of the cylinder body. The adoption of the spherical oil distribution disc is more beneficial to eliminating the inclination of an oil distribution surface and enabling an oil film to be uniform, but the spherical surface has extremely high precision requirement, the roundness error is not more than 0.002-0.003mm, the processing is difficult, and a plurality of working procedures such as turning, grinding and the like are often needed. At present, a grinding machine tool is required in a spherical grinding process, the diameter of the machined spherical surface of the existing spherical grinding machine tool is about 20mm, the diameter of the oil-distributing concave spherical surface of a cylinder body of the plunger pump is 200mm, the grinding machine tool needs to be customized, the cost is huge, the burden of an enterprise is increased, a CA6140 lathe is a very common machine tool of various machining factories, the purchase and use cost is low, if a process capable of grinding the spherical surface on the CA6140 lathe can be designed, the machining cost can be greatly reduced, and the competitiveness of the enterprise is improved.

Disclosure of Invention

The invention aims to provide a spherical grinding clamp applied to a CA6140 lathe, and the machining cost of a spherical grinding process is reduced.

The technical scheme adopted by the invention for solving the technical problem is as follows: the spherical grinding clamp applied to the CA6140 lathe comprises a base, wherein a sliding seat in sliding fit with the base and a driving mechanism for driving the sliding seat to slide are arranged on the base, a clamp main shaft and a power mechanism are arranged on the sliding seat, the power mechanism is in transmission connection with the clamp main shaft, one end of the clamp main shaft is connected with a clamping mechanism, an eccentric column is arranged on the end face of the other end of the clamp main shaft, the center line of the eccentric column is parallel to the center line of the clamp main shaft, the distance between the center line of the eccentric column and the center line of the clamp main shaft is larger than 0, and the eccentric column is connected; and one end of the base, which is close to the clamping mechanism, is provided with a mounting structure which can be in running fit with the lathe.

Furthermore, a flange plate is fixedly arranged at the end part of the clamp main shaft, an eccentric plate is arranged on the outer side surface of the flange plate, one end of the eccentric plate is tightly pressed and fixed on the flange plate through a mounting screw, an outer adjusting groove is arranged at the other end of the eccentric plate, an inner adjusting groove corresponding to the outer adjusting groove in position is arranged on the flange plate, an adjusting screw is arranged in the outer adjusting groove, and the adjusting screw penetrates through the inner adjusting groove and is matched with a fastening nut; the eccentric column is arranged on the eccentric plate.

Furthermore, a dovetail-shaped guide rail is arranged on the base, a dovetail-shaped sliding groove is formed in the lower surface of the sliding seat, and the guide rail is located in the sliding groove and is in sliding fit with the sliding groove; and the side wall of the sliding seat is provided with a locking screw, and the locking screw is in threaded fit with the sliding seat and compresses the guide rail.

Furthermore, a cushion block is arranged between the side wall of the guide rail and the side wall of the sliding groove, and the locking screw tightly presses the guide rail through the cushion block; the side wall of the sliding seat is provided with a loose screw, and the loose screw is in threaded fit with the sliding seat and is in contact with the cushion block.

Further, actuating mechanism includes lead screw and transmission piece, the lead screw is rotationally installed in the base, transmission piece fixed mounting is in the slide, the lead screw runs through the transmission piece and with transmission piece screw-thread fit.

Furthermore, the crank rocker mechanism comprises a connecting rod, a first joint bearing and a second joint bearing, an inner ring of the first joint bearing is matched with the eccentric column, one end of the connecting rod is connected with the first joint bearing, the other end of the connecting rod penetrates through an inner ring of the second joint bearing and is in threaded fit with an inner ring of the second joint bearing, and positioning nuts are arranged on the connecting rod on two sides of the second joint bearing.

Furthermore, the power mechanism is a motor, a small belt wheel is arranged on a main shaft of the motor, a large belt wheel is arranged on a main shaft of the clamp, and the small belt wheel is connected with the large belt wheel through a transmission belt.

Furthermore, the end face of the main shaft of the motor is provided with a pressing plate and a fastening screw which penetrates through the pressing plate and is in threaded fit with the main shaft of the motor, a limiting boss is arranged on the main shaft of the motor, the small belt wheel is arranged between the pressing plate and the limiting boss, and the small belt wheel is in transmission connection with the main shaft of the motor through a key.

Furthermore, the clamping mechanism is a three-jaw chuck, and the three-jaw chuck is connected with the clamp spindle through a switching disc.

Further, the mounting structure comprises a positioning through hole and a positioning column arranged on the lower surface of the base, and the center line of the positioning through hole is overlapped with the center line of the positioning column.

Compared with the prior art, the invention has the beneficial effects that: the spherical grinding fixture is rotatably arranged on a middle supporting plate of a CA6140 lathe through a mounting structure, a part to be ground is fixed on a fixture main shaft through a clamping mechanism, a sliding seat is moved to a proper position by a driving mechanism, the end part of a connecting rod of a crank rocker mechanism is fixed on the middle supporting plate, then the fixture main shaft is driven by a power mechanism to rotate according to a set rotating speed, the part to be ground is driven to rotate, the part to be ground is contacted with a grinding head, and the grinding is started. In the rotating process of the fixture main shaft, the eccentric column can also rotate along with the fixture main shaft, and due to the eccentric connection of the eccentric column and the fixture main shaft, the crank rocker mechanism can pull the eccentric column to swing, and the eccentric column drives the whole spherical grinding fixture to swing, so that the part to be ground rotates and swings at the same time, and the uniform grinding is realized. The spherical grinding clamp can be used on a CA6140 lathe, a grinder does not need to be customized, and the grinding cost is favorably reduced.

Drawings

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a side view partially in section of the present invention;

FIG. 3 is a schematic partial cross-sectional front view of the present invention;

FIG. 4 is a schematic top partial cross-sectional view of the present invention;

FIG. 5 is a schematic cross-sectional view of F-F in FIG. 2;

fig. 6 is a schematic view of the installation of the present invention.

Reference numerals: 1-a base; 2, a sliding seat; 3-a fixture main shaft; 4, a clamping mechanism; 5, an eccentric column; 6, a power mechanism; 7-a flange plate; 8, an eccentric plate; 9-outer adjustment groove; 10-inner regulating groove; 11-adjusting screws; 12-a fastening nut; 13-a guide rail; 14-cushion block; 15-locking screw; 16-loosening and tightening screws; 17-a screw rod; 18-a transmission block; 19-a connecting rod; 20 — a first spherical plain bearing; 21-small belt wheel; 22-large belt wheel; 23-a transmission belt; 24-pressing plate; 25-limiting boss; 26-a fastening screw; a 27-bond; 28-a second spherical plain bearing; 29-a switching disk; 30-a positioning column; 31-positioning the through hole; 32-parts to be ground; 33-positioning nut; 34-threaded hole.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

As shown in fig. 1, 2, 3, 4, 5 and 6, the spherical grinding fixture applied to a CA6140 lathe of the present invention includes a base 1, a slide base 2 in sliding fit with the base 1 and a driving mechanism for driving the slide base 2 to slide are provided on the base 1, a fixture spindle 3 and a power mechanism 6 are provided on the slide base 2, the power mechanism 6 is in transmission connection with the fixture spindle 3, one end of the fixture spindle 3 is connected with a clamping mechanism 4, an end face of the other end is provided with an eccentric column 5, a center line of the eccentric column 5 is parallel to a center line of the fixture spindle 3, a distance between the center line of the eccentric column 5 and the center line of the fixture spindle 3 is greater than 0, and the eccentric column 5 is connected with a crank-rocker mechanism; and one end of the base 1, which is close to the clamping mechanism 4, is provided with a mounting structure which can be in running fit with a lathe.

The base 1 can be formed by a plate with enough thickness for supporting the whole clamp and can be arranged on a middle supporting plate of a CA6140 lathe. The sliding seat 2 is used for bearing the driving mechanism, the clamp main shaft 3, the clamping mechanism 4, the power mechanism 6 and the part 32 to be ground, and the sliding seat 2 is in sliding fit with the base 1 and can convey the part 32 to be ground to a proper position. The driving mechanism is used for pushing the sliding seat 2 to slide along the base 1, and can control the movement of the sliding seat 2. The fixture main shaft 3 is mounted on the sliding seat 2 through a bearing, the clamping mechanism 4 is used for clamping a part 32 to be ground, so that the part 32 to be ground is fixed on the fixture main shaft 3, the power mechanism 6 is used for driving the fixture main shaft 3 to rotate, and the fixture main shaft 3 drives the part 32 to be ground to rotate.

When the part 32 to be ground is ground, a grinding head is required to be mounted on a CA6140 lathe, the grinding head is provided with a concave spherical surface, the convex spherical surface of the part 32 to be ground is matched with the spherical surface of the grinding head, and the power mechanism 6 is used for driving the part 32 to be ground to rotate, so that the spherical surface of the part 32 to be ground can be ground. However, the part 32 to be ground cannot achieve a grinding effect only by rotating, and the spherical surface can be uniformly ground only by swinging the part 32 to be ground left and right or up and down, so that high precision can be achieved, therefore, in the invention, the eccentric column 5 is arranged at one end of the fixture main shaft 3 away from the part 32 to be ground, the crank and rocker mechanism is hinged on the eccentric column 5, meanwhile, the mounting structure capable of being in rotating fit with the lathe is arranged at one end of the base 1 close to the clamping mechanism 4, when the fixture is mounted on the CA6140 lathe, the base 1 is in rotating fit with the middle supporting plate of the CA6140 lathe through the mounting structure, namely, the base 1 can rotate in a horizontal plane by taking the mounting structure as a center. Meanwhile, when the fixture main shaft 3 rotates, the eccentric column 5 can move along with the fixture main shaft 3, but a certain distance is reserved between the center line of the eccentric column 5 and the center line of the fixture main shaft 3, the eccentric column 5 makes a circular motion, one end of the crank rocker mechanism is hinged with the eccentric column 5, the other end of the crank rocker mechanism is hinged on a middle supporting plate of a CA6140 lathe, and the crank rocker mechanism cannot move after being fixed, the crank rocker mechanism can pull the eccentric column 5 to swing back and forth when the eccentric column 5 makes a circular motion, the eccentric column 5 drives the whole fixture to swing back and forth on the middle supporting plate of the CA6140 lathe, so that the part 32 to be ground can swing left and right simultaneously when rotating, uniform grinding is guaranteed, and good grinding precision is achieved.

But eccentric post 5 direct fixed mounting is at the terminal surface of anchor clamps main shaft 3, if adopt with 3 interference fit of anchor clamps main shaft, mode installations such as welding, as preferred technical scheme: the fixed ring flange 7 that is provided with of tip of anchor clamps main shaft 3, ring flange 7 can pass through the mounting screw on anchor clamps main shaft 3, the lateral surface of ring flange 7 is provided with eccentric plate 8, and eccentric plate 8 is the board of rectangular shape, the one end of eccentric plate 8 is compressed tightly through the mounting screw and is fixed on ring flange 7, and mounting screw and 8 clearance fit of eccentric plate, with ring flange 7 screw-thread fit. The other end of the eccentric plate 8 is provided with an outer adjusting groove 9, the flange 7 is provided with an inner adjusting groove 10 corresponding to the outer adjusting groove 9, an adjusting screw 11 is arranged in the outer adjusting groove 9, the adjusting screw 11 penetrates through the inner adjusting groove 10 and is matched with a fastening nut 12, the fastening nut 12 can adopt a butterfly nut, and the fastening nut 12 is matched with the adjusting screw 11 and can tightly press and fix the eccentric plate 8 on the flange 7. The eccentric column 5 is arranged in the middle of the eccentric plate 8. The swing angle of the clamp is related to the position of the eccentric column 5, when the distance from the center line of the eccentric column 5 to the center line of the clamp main shaft 3 is longer, the swing angle of the clamp is larger, otherwise, the swing angle is smaller, and in order to adjust the swing angle of the clamp according to requirements, the eccentric column 5 is installed in the mode. The positions of the outer adjusting groove 9 and the inner adjusting groove 10 are satisfied: when the eccentric plate 8 is turned around the mounting screw, the adjusting screw 11 is always located in the inner adjusting groove 10 and the outer adjusting groove 9. During adjustment, the mounting screw and the fastening nut 12 are loosened, the eccentric plate 8 is pushed, the eccentric plate 8 rotates to a proper position around the mounting screw, and then the mounting screw and the fastening nut 12 are screwed again.

Can adopt current arbitrary sliding fit structure between slide 2 and the base 1, set up the track, guide slot or the guide bar that the cross section personally submits various shapes on base 1 if, set up on slide 2 with track complex cell body, with guide slot complex slider or with guide bar complex through-hole, as preferred technical scheme: a dovetail-shaped guide rail 13 is arranged on the base 1, a dovetail-shaped sliding groove is arranged on the lower surface of the sliding seat 2, and the guide rail 13 is positioned in the sliding groove and is in sliding fit with the sliding groove; the side wall of the sliding seat 2 is provided with two locking screws 15, and the locking screws 15 are in threaded fit with the sliding seat 2 and press the guide rail 13. The dovetail-shaped sliding groove and the guide rail 13 have a certain limiting effect, so that the sliding seat 2 can be prevented from being separated from the base 1, and the stability of the installation of the sliding seat 2 is guaranteed. After the sliding seat 2 slides to a proper position, the locking screw 15 locks the sliding seat 2 on the base 1, so that the sliding seat 2 is prevented from moving, the stability of the sliding seat 2 is further ensured, and the grinding precision is improved. In order to accurately control the moving distance of the sliding base 2, scale lines and degrees can be arranged on the outer side surface of the guide rail 13 of the base 1.

A cushion block 14 is arranged between the side wall of the guide rail 13 and the side wall of the chute, and the locking screw 15 compresses the guide rail 13 through the cushion block 14; the side wall of the sliding seat 2 is provided with a loose screw 16, and the loose screw 16 is in threaded fit with the sliding seat 2 and is in contact with the cushion block 14. The tightening screw 16 is used for adjusting the clearance between the cushion block 14 and the sliding seat 2, so as to control the tightness degree of the sliding seat 2 and ensure the translation precision of the sliding seat 2. The loose screws 16 are generally arranged in 3 pieces, respectively at the two ends and in the middle of the cushion block 14.

Actuating mechanism is used for driving slide 2 translation, can adopt pneumatic cylinder, motor drive's rack and pinion mechanism etc. for the convenience of accurately controlling the shift position of slide 2, actuating mechanism includes lead screw 17 and transmission piece 18, lead screw 17 rotationally installs in base 1, transmission piece 18 fixed mounting is in slide 2, lead screw 17 runs through transmission piece 18 and with 18 screw-thread fit of transmission piece. The screw 17 is rotated to drive the transmission block 18 to move horizontally, and further drive the slide carriage 2 to move. The driving block 18 may be a metal block having a through hole with a thread formed therein in various shapes, and preferably, the driving block 18 is a nut which is a standard component and is directly purchased for use.

The crank and rocker mechanism comprises a connecting rod 19, a first joint bearing 20 and a second joint bearing 28, wherein the inner ring of the first joint bearing 20 is matched with the eccentric column 5, one end of the connecting rod 19 is connected with the first joint bearing 20, the other end of the connecting rod 19 penetrates through the inner ring of the second joint bearing 28 and is in threaded fit with the inner ring of the second joint bearing 28, and positioning nuts 33 are arranged on the connecting rod 19 on two sides of the second joint bearing 28. The joint bearing generally comprises an inner ring, an outer ring and a positioning rod fixedly connected with the outer ring, wherein the inner ring and the outer ring are matched through a spherical surface, so that the inner ring can rotate towards all directions within a certain range. The inner ring of the first joint bearing 20 can be in threaded fit with the eccentric column 5, and then the eccentric columns 5 on the two sides of the first joint bearing 20 are provided with the compression nuts which are in threaded connection with the eccentric columns 5, and the two compression nuts are used for clamping the first joint bearing 20, so that the first joint bearing 20 is kept stable. One end of the link 19 may be connected to the positioning rod of the first joint bearing 20 by a connecting member such as a screw. The other end of the connecting rod 19 is screw-fitted to the inner race of the second joint bearing 28 and is pressed by two positioning nuts 33, thereby stably connecting the second joint bearing 28 to the connecting rod 19. During grinding, the second joint bearing 28 needs to be fixed on a CA6140 lathe, a plurality of threaded holes 34 can be formed in the CA6140 lathe, and the threaded holes 34 are uniformly distributed in a linear manner in the sliding direction of the sliding seat 2, so that when the position of the sliding seat 2 is adjusted, the crank-rocker mechanism can move along with the sliding seat 2, and after the position of the sliding seat 2 is adjusted in place, the positioning rod of the second joint bearing 28 is screwed into the corresponding threaded hole 34. Since it is necessary to preferentially ensure that the position of the slide carriage 2 is accurate, the slide carriage 2 cannot move any more after being fixed, and the second joint bearing 28 is not necessarily accurately located at the position of a certain threaded hole 34, it is necessary to rotate the positioning nut 33, loosen the second joint bearing 28, rotate the inner race of the second joint bearing 28 to move the second joint bearing 28 to the nearest threaded hole 34 along the connecting rod 19, and tighten the positioning nut 33.

The power mechanism 6 is a motor, the motor is mounted on the sliding seat 2 through a motor base, a small belt wheel 21 is arranged on a main shaft of the motor, a large belt wheel 22 is arranged on the clamp main shaft 3, and the small belt wheel 21 is connected with the large belt wheel 22 through a transmission belt 23. The motor drives the small belt wheel 21 to rotate, the small belt wheel 21 drives the large belt wheel 22 to rotate through the transmission belt 23, and the large belt wheel 22 drives the clamp spindle 3 to rotate so as to provide power for grinding of parts. When the flange plate 7 is arranged on the end face of the fixture main shaft 3, a positioning cylinder can be arranged on one side of the flange plate 7 and sleeved on the fixture main shaft 3, the large belt wheel 22 is sleeved on the positioning cylinder, and then the positioning cylinder and the large belt wheel 22 are simultaneously fixed on the fixture main shaft 3 through a pair of mutually vertical screws so as to save installation space.

The small belt wheel 21 and the large belt wheel 22 can be mounted in a conventional manner, such as key connection and the like, preferably, a pressure plate 24 and a fastening screw 26 which penetrates through the pressure plate 24 and is in threaded fit with a motor spindle are arranged on the end face of the motor spindle, a limiting boss 25 is arranged on the motor spindle, the small belt wheel 21 is arranged between the pressure plate 24 and the limiting boss 25, the small belt wheel 21 is in transmission connection with the motor spindle through a key 27, and the key 27 plays a role in transmitting torque and is in clearance fit with the small belt wheel 21. In this way, the small belt wheel 21 can be disassembled simply, and the small belt wheel 21 can be replaced conveniently according to the required transmission ratio. The specific operation process is as follows: the fastening screw 26 is removed, the small belt wheel 21 and the key 27 are removed after the pressing plate 24 is removed, a new key 27 and the small belt wheel 21 are installed, and finally the pressing plate 24 and the fastening screw 26 are installed.

The clamping mechanism 4 can adopt any structure with a clamping function, preferably, the clamping mechanism 4 is a three-jaw chuck, and the three-jaw chuck is connected with the clamp spindle 3 through a switching disc 29. The three-jaw chuck is a clamping piece commonly used for lathes, is suitable for processing shaft parts, and is cylindrical in appearance, so that the ground part can be quickly clamped and loosened by the three-jaw chuck, and the operation is convenient.

The mounting structure can be a cylinder arranged on the lower surface of the base 1, a hole is arranged on a middle supporting plate of a CA6140 lathe, and the cylinder can be matched with the hole on the middle supporting plate of the CA6140 lathe; the mounting structure can also be a circular hole, and a cylindrical boss is arranged on the middle supporting plate of the CA6140 lathe, and the circular hole can be matched with the cylindrical boss on the CA6140 lathe. As a preferable technical solution, the mounting structure includes a positioning through hole 31 and a positioning column 30 disposed on the lower surface of the base 1, and a center line of the positioning through hole 31 coincides with a center line of the positioning column 30. The positioning column 30 is in clearance fit with a hole on a supporting plate in a CA6140 lathe, and the positioning through hole 31 is in clearance fit with a cylinder on the supporting plate in the CA6140 lathe. The positioning through hole 31 may be a stepped hole, and a bearing is provided in a hole section having a larger inner diameter to ensure that the base 1 can smoothly rotate around the mounting structure.

Claims

1. The spherical grinding clamp is applied to a CA6140 lathe and is characterized by comprising a base (1), wherein a sliding seat (2) in sliding fit with the base (1) and a driving mechanism for driving the sliding seat (2) to slide are arranged on the base (1), a clamp main shaft (3) and a power mechanism (6) are arranged on the sliding seat (2), the power mechanism (6) is in transmission connection with the clamp main shaft (3), one end of the clamp main shaft (3) is connected with a clamping mechanism (4), an eccentric column (5) is arranged on the end face of the other end of the clamp main shaft, the central line of the eccentric column (5) is parallel to the central line of the clamp main shaft (3), the distance between the central line of the eccentric column (5) and the central line of the clamp main shaft (3) is larger than 0, and the eccentric column (5) is connected with; one end of the base (1) close to the clamping mechanism (4) is provided with a mounting structure which can be in running fit with a lathe;

the crank rocker mechanism comprises a connecting rod (19), a first joint bearing (20) and a second joint bearing (28), an inner ring of the first joint bearing (20) is matched with the eccentric column (5), one end of the connecting rod (19) is connected with the first joint bearing (20), the other end of the connecting rod penetrates through an inner ring of the second joint bearing (28) and is in threaded fit with the inner ring of the second joint bearing (28), and positioning nuts (33) are arranged on the connecting rod (19) on two sides of the second joint bearing (28).

2. The spherical grinding fixture applied to the CA6140 lathe according to claim 1, wherein a flange (7) is fixedly arranged at the end part of the fixture main shaft (3), an eccentric plate (8) is arranged on the outer side surface of the flange (7), one end of the eccentric plate (8) is fixedly pressed on the flange (7) through a mounting screw, an outer adjusting groove (9) is arranged at the other end of the eccentric plate, an inner adjusting groove (10) corresponding to the outer adjusting groove (9) is arranged on the flange (7), an adjusting screw (11) is arranged in the outer adjusting groove (9), and the adjusting screw (11) penetrates through the inner adjusting groove (10) and is matched with a fastening nut (12); the eccentric column (5) is arranged on the eccentric plate (8).

3. The spherical grinding clamp applied to the CA6140 lathe according to claim 1 or 2, wherein a dovetail-shaped guide rail (13) is arranged on the base (1), a dovetail-shaped sliding groove is arranged on the lower surface of the sliding seat (2), and the guide rail (13) is positioned in the sliding groove and is in sliding fit with the sliding groove; the side wall of the sliding seat (2) is provided with a locking screw (15), and the locking screw (15) is in threaded fit with the sliding seat (2) and compresses the guide rail (13).

4. The spherical grinding fixture applied to the CA6140 lathe according to the claim 3, characterized in that a cushion block (14) is arranged between the side wall of the guide rail (13) and the side wall of the chute, and the locking screw (15) presses the guide rail (13) through the cushion block (14); the side wall of the sliding seat (2) is provided with a tightening screw (16), and the tightening screw (16) is in threaded fit with the sliding seat (2) and is in contact with the cushion block (14).

5. The spherical grinding fixture applied to the CA6140 lathe as recited in claim 1 or 2, characterized in that the driving mechanism comprises a screw rod (17) and a transmission block (18), the screw rod (17) is rotatably mounted on the base (1), the transmission block (18) is fixedly mounted on the sliding base (2), and the screw rod (17) penetrates through the transmission block (18) and is in threaded fit with the transmission block (18).

6. The spherical grinding fixture applied to the CA6140 lathe according to claim 1 or 2, wherein the power mechanism (6) is a motor, a small belt wheel (21) is arranged on a main shaft of the motor, a large belt wheel (22) is arranged on the fixture main shaft (3), and the small belt wheel (21) is connected with the large belt wheel (22) through a transmission belt (23).

7. The spherical grinding fixture applied to the CA6140 lathe according to claim 6, wherein a pressure plate (24) and a fastening screw (26) penetrating through the pressure plate (24) and in threaded fit with the motor spindle are arranged on the end face of the motor spindle, a limiting boss (25) is arranged on the motor spindle, the small belt pulley (21) is arranged between the pressure plate (24) and the limiting boss (25), and the small belt pulley (21) is in transmission connection with the motor spindle through a key (27).

8. Spherical grinding fixture applied to CA6140 lathe according to claim 1 or 2, characterized in that the clamping mechanism (4) is a three-jaw chuck, which is connected to the fixture spindle (3) by means of an adapter disc (29).

9. The spherical grinding fixture applied to the CA6140 lathe according to claim 1 or 2, wherein the mounting structure comprises a positioning through hole (31) and a positioning column (30) arranged on the lower surface of the base (1), and the center line of the positioning through hole (31) is coincident with the center line of the positioning column (30).