A spherical workpiece clamping tool

Abstract

The present invention relates to the technical field of clamping structures, and in particular to a spherical workpiece clamping tool, comprising a support body and a plurality of adsorption units installed on the support body, wherein the adsorption units are used to adsorb and fix the spherical workpiece, and the plurality of adsorption units are distributed in a ring shape; the adsorption units comprise a support barrel with an opening facing the direction of the spherical workpiece, and a support plate is arranged in the support barrel; since the plurality of adsorption units can achieve both an adsorption and fixing effect on the spherical workpiece and a clamping and fixing effect with the help of friction, the fixing strength of the spherical workpiece can be greatly improved, and at the same time, this method can directly act on the spherical surface, without the need for frequent disassembly and assembly and adjustment of the position of the spherical workpiece during processing, the processing method of the spherical workpiece is greatly simplified, and work efficiency is improved.

Description

Technical Field

[0001] This invention relates to the technical field of clamping structures, and in particular to a clamping fixture for spherical workpieces. Background Technology

[0002] In the manufacturing industry, metal parts come in a variety of shapes, including spherical parts such as the ball seal of a hemispherical valve, mushroom nails, pipe caps, spherical projector balls, and spherical end caps. These parts typically require end face processing during machining. Due to their unique shape, it is impossible to clamp the spherical surface directly; clamping can only be achieved through the edge of the part. When the cutting tool approaches the clamping structure on the part, the part's position needs to be adjusted to expose the portion obscured by the clamping structure before clamping and machining. This method is extremely cumbersome and severely impacts work efficiency. To address these issues, this invention provides a spherical workpiece clamping fixture that can directly clamp the spherical surface. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a spherical workpiece clamping fixture, the specific technical solution of which is as follows:

[0004] A spherical workpiece clamping fixture includes a support body and multiple sets of adsorption units mounted on the support body. The adsorption units are used to adsorb and fix the spherical workpiece, and the multiple sets of adsorption units are arranged in a ring.

[0005] The adsorption unit includes a support barrel with its opening facing the spherical workpiece. A support plate is provided inside the support barrel. The support plate is spherical in shape and has multiple rotating balls densely distributed on it. The rotating balls penetrate the support plate, and a rod is slidably inserted on each rotating ball. One end of the rod is located inside the support barrel, and the other end of the rod is provided with a suction cup.

[0006] The inner side of the support barrel has a stop at the end of the insertion rod to limit the position of the insertion rod on the rotating ball. Adjacent insertion rods are elastically connected by a spring sheet. A negative pressure pipe is connected to the support barrel and communicates with the inside of the support barrel. The inside of the support barrel is also connected to the suction cup.

[0007] Furthermore, a sealing ring for sealing is provided at the port position of the suction cup.

[0008] Furthermore, both the interior of the support plate and the interior of the sealing ring are hollow. An annular air guide chamber is provided inside the suction cup, which is connected to the interior of the sealing ring. A first air passage and a second air passage are provided inside the insertion rod. One end of the first air passage is connected to the interior of the suction cup, and the other end of the first air passage is connected to the interior of the support barrel. One end of the second air passage is connected to the annular air guide chamber, and the other end of the second air passage is set as a long opening that extends into the rotating ball. A notch is provided on the rotating ball that is connected to the interior of the support plate, and the notch is connected to the second air passage.

[0009] When the insert rod moves, the long opening at the end of the second airway is always hidden inside the rotating ball, and the notch and the long opening remain in communication.

[0010] Furthermore, grooves are provided on the front and rear inner sidewalls of the support barrel, and springs are installed in the grooves. One end of the spring is connected to the inner wall of the groove, and the other end of the spring is connected to a slider, which is fixedly connected to the support plate.

[0011] The support plate and the support barrel slide relative to each other.

[0012] Furthermore, a grooved plate is provided on the side wall of the support plate inside the support barrel. The grooved plate passes through the support barrel and slides relative to it. The sliding direction of the grooved plate is consistent with the moving direction of the support plate inside the support barrel. A sealing block is slidably arranged inside the grooved plate and fixed on the support barrel. The grooved plate inside the support barrel and the inside of the support barrel form a sealed space. This sealed space is connected to the inside of the support plate through a vent pipe.

[0013] Furthermore, the support body includes a support beam that provides support and a cross beam mounted on the support beam. Each end of the cross beam has a sliding plate that slides through it, and the sliding plate is rotatably connected to the outer wall of the support barrel.

[0014] Furthermore, both the interior of the cross and the interior of the slide plate are hollow, the slide plate is connected to the cross, the support beam is provided with an air intake pipe for communicating with the cross, and the cross and the slide plate are connected by a connecting plate.

[0015] The negative pressure pipe is connected to the slide plate.

[0016] Furthermore, each of the support barrels is provided with an arc-shaped limiting plate. The rotation axis of the support barrel and the slide plate coincides with the arc axis of the arc-shaped limiting plate. The end of the arc-shaped limiting plate away from the support barrel is slidably inserted into the slide plate, and the end of the arc-shaped limiting plate inside the slide plate is provided with an outer edge.

[0017] The advantages of this invention are:

[0018] Because multiple adsorption units achieve both adsorption and clamping fixation of the spherical workpiece, the fixation strength of the spherical workpiece can be greatly improved. This method can also act directly on the spherical surface, eliminating the need for frequent disassembly and adjustment of the spherical workpiece during processing, significantly simplifying the processing method and improving work efficiency. The spherical design of the support plate and the combination of the rotating ball and insert rod allow the suction cup to automatically adjust its position according to the curvature of the workpiece, effectively adapting to spherical workpieces of different diameters and curvatures, improving the versatility and flexibility of the tooling. Utilizing the dual effects of negative pressure adsorption and friction, not only is the contact area between the workpiece and the clamping tooling increased, but multi-point clamping also achieves stable fixation of the workpiece, significantly improving workpiece stability during processing, reducing processing errors, and ensuring processing accuracy. Based on its structural characteristics, this tooling is easily integrated into automated or intelligent production lines. Through precise control of negative pressure and a monitoring system, the processing process can be further automated, improving the overall level of intelligent manufacturing. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 yes Figure 1 A magnified schematic diagram of the support structure and adsorption unit.

[0022] Figure 3 yes Figure 2 Right view structural diagram;

[0023] Figure 4 yes Figure 2 A schematic diagram of the enlarged structure of the adsorption unit;

[0024] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure of the central support barrel;

[0025] Figure 6 yes Figure 5 Enlarged structural diagram of the central support plate and its upper structure;

[0026] Figure 7 yes Figure 6 Enlarged schematic diagram of the middle insertion rod;

[0027] Figure 8 yes Figure 7 Schematic diagram of cross-section structure;

[0028] Figure 9 yes Figure 2 Schematic diagram of the cross section structure;

[0029] Reference numerals: 1. Spherical workpiece; 2. Support body; 3. Adsorption unit; 4. Support barrel; 5. Support plate; 6. Rotating ball; 7. Insert rod; 8. Suction cup; 9. Negative pressure pipe; 10. Sealing ring; 11. Annular air guide chamber; 12. First air passage; 13. Second air passage; 14. Groove; 15. Spring; 16. Slider; 17. Groove plate; 18. Sealing block; 19. Air guide pipe; 20. Support beam; 21. Suction pipe; 22. Cross; 23. Slide plate; 24. Connecting plate; 25. Arc-shaped limiting plate; 26. Spring. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] In the description of this invention, it should be noted that the orientations or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inner", and "outer" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. This embodiment is written in a progressive manner.

[0033] like Figures 1 to 9 As shown, a spherical workpiece clamping fixture of the present invention includes a support body 2 and multiple sets of adsorption units 3 installed on the support body 2. The adsorption units 3 are used to adsorb and fix the spherical workpiece 1. The multiple sets of adsorption units 3 are arranged in a ring.

[0034] The adsorption unit 3 includes a support barrel 4 with its opening facing the spherical workpiece 1. A support plate 5 is provided inside the support barrel 4. The support plate 5 is spherical in shape. Multiple rotating balls 6 are densely distributed on the support plate 5. The rotating balls 6 penetrate the support plate 5, and a rod 7 is slidably inserted on the rotating balls 6. One end of the rod 7 is located inside the support barrel 4, and the other end of the rod 7 is provided with a suction cup 8.

[0035] The inner side of the support barrel 4 has a stop at the end of the insertion rod 7 for limiting the position of the insertion rod 7 on the rotating ball 6. Adjacent insertion rods 7 are elastically connected by a spring piece 26. A negative pressure pipe 9 is connected to the support barrel 4 and communicates with the inside of the support barrel 4. The inside of the support barrel 4 is also connected to the suction cup 8.

[0036] In detail, the support body 2 uses multiple sets of adsorption units 3 to adsorb and fix the spherical surface of the spherical workpiece 1. The support plate 5 is used to seal the opening of the support barrel 4, thereby forming a sealed space inside the support barrel 4. The support plate 5 supports multiple rotating balls 6 and multiple insert rods 7. The support plate 5 is spherical in shape, which allows the multiple suction cups 8 to be better distributed spherically. Since the rotating balls 6 can rotate on the support plate 5 and the insert rods 7 can slide on the rotating balls 6, the position and direction of the suction cups 8 can be adjusted on the support plate 5, so that the multiple suction cups 8 can be arranged in a spherical arrangement with different curvatures, which facilitates the adsorption and fixation of spherical workpieces 1 with different diameters. The adsorption unit 3 uses multiple... The suction cup 8's adsorption effect on the spherical workpiece 1 increases the contact area and adsorption strength between the adsorption unit 3 and the spherical workpiece 1, thereby improving the fixing effect of the spherical workpiece 1. The stop on the insertion rod 7 is used to prevent the insertion rod 7 from being pulled off the rotating ball 6. Since two adjacent insertion rods 7 are connected by a spring piece 26, the spring piece 26 can easily reset the position of the insertion rod 7 and the suction cup 8 on the support plate 5. Furthermore, since the support plate 5 is spherical, each insertion rod 7 slides in a different direction on the support plate 5 in its natural state. In this way, the shape of the support plate 5, the sliding direction of the insertion rod 7, and the spring piece 26 can achieve the position limitation effect of multiple insertion rods 7 on the support plate 5, preventing multiple insertion rods 7 from detaching from the support plate 5.

[0037] In use, the spherical workpiece 1 is placed on multiple sets of adsorption units 3 on the support body 2. Air is drawn out from inside the support barrel 4 through the negative pressure pipe 9, creating a negative pressure inside the support barrel 4. Since the support barrel 4 is connected to the suction cup 8, a negative pressure is also created inside the suction cup 8. The suction cup 8 contacts the spherical surface of the workpiece 1 and adsorbs it, thus achieving the clamping and fixing of the spherical workpiece 1. When a negative pressure is created inside the support barrel 4, the insertion rod 7 is affected by the air pressure and can pass through the rotating ball 6 and extend into the support barrel 4. At this time, the spherical workpiece 1 moves synchronously towards the support barrel 4. Because multiple sets of adsorption units 3 simultaneously adsorb and fix the spherical workpiece 1, the support barrel 4 simultaneously moves towards the multiple adsorption units. As unit 3 moves, suction cup 8 and spherical workpiece 1 are in an adsorption state. When there is a relative movement tendency, friction will be generated between them. Therefore, suction cup 8 prevents spherical workpiece 1 from tilting relative to adsorption unit 3 through friction. Multiple suction cups 8 simultaneously prevent spherical workpiece 1 from moving through friction. The directions of multiple friction forces are at an angle to each other. Multiple adsorption units 3 use friction to linearly fix spherical workpiece 1, so the position of spherical workpiece 1 is automatically fixed. Insertion rod 7 automatically stops moving on rotating ball 6. At the same time, with the help of friction, multiple adsorption units 3 achieve a clamping fixation effect on spherical workpiece 1, thereby realizing multiple fixation work on spherical workpiece 1 and improving the fixation strength of spherical workpiece 1.

[0038] It should be noted that when fixing spherical workpieces 1 with different curvatures, the position of the suction cup 8 on the support plate 5 can be adjusted by the reverse thrust of the spherical workpiece 1 to move the rotating ball 6 and the insertion rod 7, thereby changing the position of the multiple suction cups 8 on the adsorption unit 3 and fully adhering to the spherical workpiece 1, thus achieving effective fixing of spherical workpieces 1 with different curvatures.

[0039] Because multiple adsorption units 3 achieve both adsorption and clamping effects on the spherical workpiece 1, and also utilize friction to achieve a gripping fixation effect, the fixation strength of the spherical workpiece 1 can be greatly improved. This method can also act directly on the spherical surface, eliminating the need for frequent disassembly and adjustment of the spherical workpiece 1 during processing, significantly simplifying the processing method and improving work efficiency. Through the spherical design of the support plate 5 and the combined structure of the rotating ball 6 and the insertion rod 7, the suction cup 8 can automatically adjust its position according to the curvature of the workpiece, achieving effective adaptation to spherical workpieces of different diameters and curvatures, improving the versatility and flexibility of the tooling. Utilizing the dual effects of negative pressure adsorption and friction, not only is the contact area between the workpiece and the clamping tooling increased, but multi-point clamping also achieves stable fixation of the workpiece, significantly improving workpiece stability during processing, reducing processing errors, and ensuring processing accuracy. Based on its structural characteristics, this tooling is easily integrated into automated or intelligent production lines. Through precise control of the negative pressure and monitoring system, further automated control of the processing process can be achieved, improving the overall level of intelligent manufacturing.

[0040] Furthermore, a sealing ring 10 for sealing is provided at the port position of the suction cup 8.

[0041] In detail, by setting the sealing ring 10, the sealing between the port of the suction cup 8 and the spherical workpiece 1 can be enhanced, the adsorption and fixation effect of the suction cup 8 on the spherical workpiece 1 can be improved, and the coefficient of friction between the suction cup 8 and the spherical workpiece 1 can be increased.

[0042] Furthermore, both the interior of the support plate 5 and the interior of the sealing ring 10 are hollow. An annular air guide chamber 11 is provided inside the suction cup 8, which is connected to the interior of the sealing ring 10. A first air passage 12 and a second air passage 13 are provided inside the insertion rod 7. One end of the first air passage 12 is connected to the interior of the suction cup 8, and the other end of the first air passage 12 is connected to the interior of the support barrel 4. One end of the second air passage 13 is connected to the annular air guide chamber 11, and the other end of the second air passage 13 is set as a long opening and extends into the rotating ball 6. A notch is provided on the rotating ball 6 that is connected to the interior of the support plate 5, and the notch is connected to the second air passage 13.

[0043] When the insertion rod 7 moves, the long opening at the end of the second air passage 13 is always hidden inside the rotating ball 6, and the notch and the long opening remain in communication.

[0044] In detail, the position of the long opening inside the rotating ball 6 is limited by the upper edge of the insert rod 7 and the spring piece 26, thereby preventing the long opening from moving out of the rotating ball 6 and ensuring that the inside of the support plate 5 can always be connected through the notch, the second air passage 13 and the annular air guide chamber 11.

[0045] The negative pressure inside the support barrel 4 can be transmitted to the suction cup 8 through the first air channel 12, thereby adsorbing and fixing the spherical workpiece 1 through the suction cup 8. Gas is supplied to the inside of the support plate 5, and the gas inside the support plate 5 can be supplied into the sealing ring 10 through the notch, the second air channel 13 and the annular air guide chamber 11, thereby causing the sealing ring 10 to expand and make better contact with the spherical workpiece 1, increasing the contact area between the adsorption unit 3 and the spherical workpiece 1. At the same time, when the sealing ring 10 contacts and is squeezed against the spherical workpiece 1, the sealing ring 10 undergoes elastic deformation. Through the deformation of the sealing ring 10, the adsorption unit 3 can better adapt to spherical workpieces 1 with different curvatures.

[0046] Furthermore, grooves 14 are provided on the front and rear inner sidewalls of the support barrel 4. A spring 15 is provided in the groove 14. One end of the spring 15 is connected to the inner wall of the groove 14, and the other end of the spring 15 is connected to a slider 16. The slider 16 is fixedly connected to the support plate 5.

[0047] Among them, the support plate 5 and the support barrel 4 slide relative to each other.

[0048] In detail, when a negative pressure is formed inside the support barrel 4, the suction cup 8 adsorbs the spherical workpiece 1. At this time, the external air pressure also exerts a force on the support plate 5, causing the support plate 5 to slide inside the support barrel 4. Since the direction of movement of the support plate 5 is not the same as the direction of the force exerted by the multiple adsorption units 3 on the spherical workpiece 1, the sliding of the support plate 5 can generate an inclined frictional force between the suction cup 8 and the spherical workpiece 1. The frictional forces exerted by the multiple adsorption units 3 on the spherical workpiece 1 have different directions. Therefore, the negative pressure inside the support plate 5 and the support barrel 4 can be used to achieve a clamping and fixing method for the spherical workpiece 1. This clamping and fixing method, together with the clamping method of the adsorption units 3 on the spherical workpiece 1, achieves a clamping and fixing effect on the spherical workpiece 1.

[0049] When the support plate 5 moves, the support plate 5 can drive the slider 16 to slide in the groove 14, and the spring 15 provides a reset force to the slider 16.

[0050] Furthermore, a groove plate 17 is provided on the side wall of the support plate 5 inside the support barrel 4. The groove plate 17 passes through the support barrel 4 and slides relative to it. The sliding direction of the groove plate 17 is consistent with the moving direction of the support plate 5 inside the support barrel 4. A sealing block 18 is slidably arranged inside the groove plate 17. The sealing block 18 is fixed on the support barrel 4. The groove plate 17 inside the support barrel 4 and the interior of the support barrel 4 form a sealed space. This sealed space is connected to the interior of the support plate 5 through the air guide pipe 19.

[0051] In detail, when the support plate 5 moves, the groove plate 17 moves synchronously, the sealed space formed inside the groove plate 17 decreases, and the gas in the space can be supplied into the support plate 5 through the air guide pipe 19, thereby causing the sealing ring 10 to expand.

[0052] The sealing block 18 is used to seal the groove plate 17, thereby forming a sealed space inside the groove plate 17 in the groove 14.

[0053] In actual use, the moving distance of the support plate 5 is small, so the expansion volume of the sealing ring 10 is small, and there is no need to worry about the sealing ring 10 bursting.

[0054] Furthermore, the support body 2 includes a support beam 20 that provides support and a cross 22 installed on the support beam 20. Each end of the cross 22 is slidably inserted with a sliding plate 23, and the sliding plate 23 is rotatably connected to the outer wall of the support barrel 4.

[0055] In detail, the support beam 20, cross 22 and slide plate 23 can support multiple support barrels 4. At the same time, since the support barrels 4 rotate on the slide plate 23, the direction of the support barrels 4 can be adjusted arbitrarily, so that the support barrels 4 face the spherical workpiece 1. Since each slide plate 23 can slide into the cross 22, the position of the support barrels 4 can be adjusted by the slide plate 23, so that the adsorption distance of multiple adsorption units 3 on the spherical workpiece 1 can be adjusted.

[0056] Furthermore, both the interior of the cross 22 and the interior of the slide plate 23 are hollow, the slide plate 23 is connected to the cross 22, the support beam 20 is provided with an air intake pipe 21 for communicating with the cross 22, and the cross 22 and the slide plate 23 are connected by a connecting plate 24.

[0057] The negative pressure pipe 9 is connected to the slide plate 23.

[0058] In detail, the connecting plate 24 provides elastic thrust to the slide plate 23. When the suction pipe 21 removes the air from the cross 22, the cross 22 can remove the air from the support barrel 4 through the slide plate 23 and the negative pressure pipe 9. At this time, due to the action of the connecting plate 24, the cross 22 and the slide plate 23 cannot move relative to each other. The connecting plate 24 is used to connect the cross 22 and the slide plate 23. When it is necessary to adjust the position of the slide plate 23 on the cross 22, the connecting plate 24 is removed, the slide plate 23 is pushed to slide on the cross 22, and then the connecting plate 24 is assembled between the cross 22 and the slide plate 23.

[0059] In actual use, the connecting plate 24 can be connected and fixed to the cross 22 and the slide plate 23 by bolts.

[0060] Furthermore, each of the support barrels 4 is provided with an arc-shaped limiting plate 25. The rotation axis of the support barrel 4 and the slide plate 23 coincides with the arc axis of the arc-shaped limiting plate 25. The end of the arc-shaped limiting plate 25 away from the support barrel 4 is slidably inserted into the slide plate 23, and the end of the arc-shaped limiting plate 25 inside the slide plate 23 is provided with an outer edge.

[0061] In detail, by setting the arc-shaped limiting plate 25 and its outer edge, the rotation position of the support barrel 4 on the slide plate 23 can be limited. When the spherical workpiece 1 is removed, air is injected into the cross 22 in the opposite direction through the suction pipe 21. At this time, the air pressure in the slide plate 23 will push the arc-shaped limiting plate 25 to slide through the arc-shaped limiting plate 25 and its outer edge. The outer edge of the arc-shaped limiting plate 25 abuts against the inner wall of the slide plate 23, and the support barrel 4 returns to its initial state.

[0062] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A spherical workpiece clamping tool, characterized in that: It comprises a support body (2) and a plurality of groups of adsorption units (3) mounted on the support body (2), wherein the adsorption units (3) are used to adsorb and fix the spherical workpiece (1), and the plurality of groups of adsorption units (3) are distributed in a ring shape; The adsorption unit (3) comprises a support barrel (4) with an opening facing the spherical workpiece (1), a support plate (5) being arranged in the support barrel (4), the support plate (5) being spherical in shape, a plurality of rotating balls (6) being densely distributed on the support plate (5), the rotating balls (6) penetrating the support plate (5), and an insertion rod (7) being slidably inserted through the rotating balls (6), one end of the insertion rod (7) being located inside the support barrel (4), and a suction cup (8) being arranged at the other end of the insertion rod (7); The end of the insertion rod (7) inside the support barrel (4) is provided with a retaining edge for limiting the position of the insertion rod (7) on the rotating ball (6); two adjacent insertion rods (7) are elastically connected via a spring sheet (26); a negative pressure pipe (9) is provided on the support barrel (4); the negative pressure pipe (9) is in communication with the interior of the support barrel (4), and the interior of the support barrel (4) is in communication with the suction cup (8); A sealing ring (10) for sealing is provided at the port position of the suction cup (8); The interior of the support plate (5) and the interior of the sealing ring (10) are both hollow, the suction cup (8) is provided with an annular air guide chamber (11), the annular air guide chamber (11) is communicated with the interior of the sealing ring (10), the insertion rod (7) is provided with a first air channel (12) and a second air channel (13), one end of the first air channel (12) is communicated with the interior of the suction cup (8), the other end of the first air channel (12) is communicated with the interior of the support barrel (4), one end of the second air channel (13) is communicated with the annular air guide chamber (11), the other end of the second air channel (13) is set as a long opening and extends into the rotating ball (6), the rotating ball (6) is provided with a notch communicated with the interior of the support plate (5), and the notch is communicated with the second air channel (13); When the insertion rod (7) moves, the long opening at the end of the second airway (13) is always hidden in the rotating ball (6), and the notch and the long opening remain in a connected state; The front and rear inner walls of the support barrel (4) are both provided with grooves (14), a spring (15) is arranged in the groove (14), one end of the spring (15) is connected to the inner wall of the groove (14), the other end of the spring (15) is connected to a slider (16), and the slider (16) is fixedly connected to the support plate (5); The support plate (5) and the support barrel (4) slide relative to each other; A groove plate (17) is provided on the side wall of the support plate (5) inside the support barrel (4). The groove plate (17) passes through the support barrel (4) and slides relatively thereto. The sliding direction of the groove plate (17) is consistent with the moving direction of the support plate (5) inside the support barrel (4). A sealing block (18) is slidably provided inside the groove plate (17). The sealing block (18) is fixed on the support barrel (4). The groove plate (17) inside the support barrel (4) and the interior of the support barrel (4) form a closed space. The closed space is communicated with the interior of the support plate (5) through an air guide pipe (19).

2. A spherical workpiece clamping fixture according to claim 1, characterized in that: The support body (2) comprises a supporting beam (20) and a cross (22) mounted on the supporting beam (20). A slide plate (23) is slidably inserted through each end of the cross (22). The slide plate (23) is rotatably connected to the outer wall of the supporting barrel (4).

3. A spherical workpiece clamping fixture according to claim 2, characterized in that: The interior of the cross (22) and the interior of the slide plate (23) are both hollow, the slide plate (23) is in communication with the cross (22), an air intake pipe (21) for communicating with the cross (22) is provided on the support beam (20), and the cross (22) and the slide plate (23) are connected via a connecting plate (24); The negative pressure pipe (9) is in communication with the slide plate (23).

4. A spherical workpiece clamping fixture according to claim 3, characterized in that: Each of the support barrels (4) is provided with an arc-shaped limit plate (25), the rotation axis of the support barrel (4) and the slide plate (23) coincides with the arc-shaped limit plate (25), the end of the arc-shaped limit plate (25) away from the support barrel (4) is slidably inserted into the slide plate (23), and the end of the arc-shaped limit plate (25) in the slide plate (23) is provided with an outer edge.

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