CN213729417U - Multi-connecting-rod type pneumatic chuck - Google Patents

Abstract

The utility model discloses a multi-connecting rod type pneumatic chuck, which comprises a turntable, wherein two first cylinders and two second cylinders are respectively and fixedly arranged on the front side wall of the turntable; a piston rod of the first cylinder is connected with a first clamping jaw; two first centering mechanisms are arranged between the two first clamping jaws, and each first centering mechanism comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod which are sequentially hinged end to end; a piston rod of the second cylinder is connected with a second clamping jaw; two second centering mechanisms are arranged between the second clamping jaws and comprise a fifth connecting rod, a sixth connecting rod, a seventh connecting rod and an eighth connecting rod which are sequentially hinged end to end. The utility model discloses a first centering mechanism and second centering mechanism realize two liang of linkages of four cylinders on the carousel, avoid every to the jack catch condition of decentraction appearing when the centre gripping to improve the machining precision of work piece.

Description

Multi-connecting-rod type pneumatic chuck

Technical Field

The utility model relates to a machining equipment technical field especially relates to a multi-link formula air chuck.

Background

In the field of machining technology, an air chuck is a common machining device, and is used for further machining such as cutting and punching after clamping a workpiece. In the prior art, two pairs of cylinders are generally arranged on a turntable, each pair of cylinders are arranged oppositely, and four cylinders are used for driving clamping jaws to clamp a workpiece from four directions. The piston rods of the cylinders of the chuck are theoretically consistent in movement speed, but due to manufacturing errors and the like in the actual working process, the piston rods of each pair of cylinders on the chuck generally cannot realize strict synchronous action, so that the concentricity is low when a workpiece is clamped, and the machining precision of the workpiece is easily reduced.

SUMMERY OF THE UTILITY MODEL

In order to make up the defects of the prior art, the utility model provides a multi-connecting rod type pneumatic chuck, which connects the first clamping jaws on two first cylinders through a first centering mechanism, so that the two first clamping jaws synchronously move towards the center of a turntable or synchronously keep away from the center of the turntable; the second clamping jaws on the two second cylinders are connected through the second centering mechanism, so that the two second clamping jaws move towards the center of the turntable synchronously or are away from the center of the turntable synchronously, two-two linkage of the four cylinders on the turntable is realized, the condition that each pair of clamping jaws are not concentric during clamping is avoided, the machining precision of workpieces is improved, and the problems existing in the prior art are solved.

The utility model discloses a realize through following technical scheme:

a multi-connecting rod type pneumatic chuck comprises a rotary table, wherein a through hole is formed in the center of the rotary table; two first cylinders and two cushion blocks are respectively and fixedly arranged on the front side wall of the turntable; the two first air cylinders are symmetrically distributed by taking a diameter line of the rotary table as a center; the cushion blocks are fixedly provided with second cylinders, and the two second cylinders are symmetrically distributed by taking a diameter line of the rotary table as a center; the central connecting line of the two first cylinders is vertical to the central connecting line of the two second cylinders;

a piston rod of the first cylinder is connected with a first clamping jaw; two first centering mechanisms are arranged between the two first clamping jaws, the two first centering mechanisms are symmetrically distributed by taking a central connecting line of the two first cylinders as a center, and the central connecting line of the two first centering mechanisms is superposed with a diameter line of the rotary table; two first sliding grooves are formed in the front side wall of the rotary table, and the positions of the two first sliding grooves correspond to the positions of the two first centering mechanisms respectively;

the first centering mechanism comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod which are sequentially hinged end to end; the other end of the first connecting rod and the other end of the fourth connecting rod are hinged with the end parts of the two first clamping jaws respectively; the rear parts of the second connecting rod and the third connecting rod are both connected with first sliding mechanisms, and the two first sliding mechanisms are slidably arranged in corresponding first sliding grooves;

a piston rod of the second cylinder is connected with a second clamping jaw; two second centering mechanisms are arranged between the two second clamping jaws, the two second centering mechanisms are symmetrically distributed by taking a central connecting line of the two second cylinders as a center, and the central connecting line of the two second centering mechanisms is superposed with a diameter line of the rotary table; second sliding grooves are formed in the front side walls of the two first cylinders, and the positions of the two second sliding grooves correspond to the positions of the two second centering mechanisms respectively;

the second centering mechanism comprises a fifth connecting rod, a sixth connecting rod, a seventh connecting rod and an eighth connecting rod which are sequentially hinged end to end; the other end of the fifth connecting rod and the other end of the eighth connecting rod are hinged with the end parts of the two second clamping jaws respectively; and the rear parts of the sixth connecting rod and the seventh connecting rod are both connected with second sliding mechanisms, and the two second sliding mechanisms are slidably arranged in corresponding second sliding grooves.

Further optimally, the first cylinder and the second cylinder are both double-shaft cylinders.

Preferably, the height of the cushion block is greater than or equal to the height of the first cylinder.

Preferably, the first clamping jaws are provided with first roller bases on the sides far away from the first cylinder, and first rollers are arranged on the first roller bases in a rolling manner; and one side of the second clamping jaw, which is far away from the second cylinder, is provided with a second roller base, and second rollers are arranged on the second roller bases in a rolling manner.

Preferably, the number of the first rollers on the first roller seat is two, and the two first rollers are distributed in parallel; the number of the second rollers on the second roller seat is two, and the two second rollers are distributed in parallel.

Preferably, the middle positions of the two ends of each first jaw are respectively provided with a first groove, the first grooves of the two ends of one first jaw are respectively hinged with the end parts of the two first connecting rods, and the first grooves of the two ends of the other first jaw are respectively hinged with the end parts of the two fourth connecting rods;

and second grooves are formed in the middle positions of the two ends of the second clamping jaw, the second grooves in the two ends of one second clamping jaw are respectively hinged with the end parts of the two fifth connecting rods, and the second grooves in the two ends of the other second clamping jaw are respectively hinged with the end parts of the two eighth connecting rods.

Preferably, the two first guide rods are connected between the two first cylinders and symmetrically distributed by taking a central connecting line of the two first cylinders as a center; the first clamping jaw is provided with two first guide holes, the shapes and the positions of the two first guide holes correspond to those of the two first guide rods, and the first clamping jaw is slidably sleeved on the two first guide rods through the two first guide holes;

two second guide rods are connected between the two second cylinders and are symmetrically distributed by taking a central connecting line of the two second cylinders as a center; the second clamping jaw is provided with two second guide holes, the shapes and the positions of the two second guide holes correspond to those of the two second guide rods, and the second clamping jaw is slidably sleeved on the two second guide rods through the two second guide holes.

Preferably, the first sliding mechanism comprises a first connecting shaft and a first bearing sleeved on the first connecting shaft, the rear parts of the second connecting rod and the third connecting rod are connected with the first connecting shaft, and the first bearing is slidably mounted in the corresponding first sliding chute;

the second sliding mechanism comprises a second connecting shaft and a second bearing sleeved on the second connecting shaft, the rear parts of the sixth connecting rod and the seventh connecting rod are both connected with the second connecting shaft, and the second bearing is slidably mounted in the corresponding second sliding groove.

Preferably, in the first centering mechanism, the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod are distributed in a W shape; in the second centering mechanism, the fifth connecting rod, the sixth connecting rod, the seventh connecting rod and the eighth connecting rod are distributed in a W shape.

Further optimally, the first connecting rod, the fourth connecting rod, the fifth connecting rod and the eighth connecting rod are equal in length, and the second connecting rod, the third connecting rod, the sixth connecting rod and the seventh connecting rod are equal in length.

The utility model has the advantages that:

the multi-connecting rod type pneumatic chuck of the utility model connects the first claws on the two first cylinders through the first centering mechanism, so that the two first claws synchronously move towards the center of the turntable or synchronously keep away from the center of the turntable; the second clamping jaws on the two second cylinders are connected through the second centering mechanism, so that the two second clamping jaws move towards the center of the turntable synchronously or are away from the center of the turntable synchronously, two-two linkage of the four cylinders on the turntable is realized, the condition that each pair of clamping jaws are not concentric during clamping is avoided, the machining precision of workpieces is improved, and the clamping device is suitable for wide popularization and application.

Drawings

Fig. 1 is a schematic diagram of the front structure of the present invention.

Fig. 2 is a schematic diagram of the front structure of the middle rotary table of the present invention.

Fig. 3 is a schematic front structural view of two first cylinders in the present invention.

Fig. 4 is the rear structure schematic diagram of two first cylinders in the present invention.

Fig. 5 is a schematic structural view of the first jaw of the present invention.

Fig. 6 is a schematic front structural view of the first centering mechanism of the present invention.

Fig. 7 is a rear structure diagram of the first centering mechanism of the present invention.

Fig. 8 is a schematic front structural view of two second cylinders in the present invention.

Fig. 9 is a rear structure diagram of two second cylinders in the present invention.

Fig. 10 is a schematic structural view of the second jaw of the present invention.

Fig. 11 is a schematic front structural view of a second centering mechanism according to the present invention.

Fig. 12 is a rear structure diagram of the second centering mechanism of the present invention.

In the figure, 1, a turntable; 11. a through hole; 12. a first chute; 13. a first sliding mechanism; 131. a first connecting shaft; 132. a first bearing; 14. a second chute; 15. a second sliding mechanism; 151. a second connecting shaft; 152. a second bearing;

2. a first cylinder; 21. a first jaw; 22. a first roller base; 23. a first drum; 24. a first groove; 25. a first guide bar; 26. a first guide hole;

3. cushion blocks; 31. a second cylinder; 32. a second jaw; 33. a second roller base; 34. a second drum; 35. a second groove; 36. a second guide bar; 37. a second guide hole;

4. a first centering mechanism; 41. a first link; 42. a second link; 43. a third link; 44. a fourth link;

5. a second centering mechanism; 51. a fifth link; 52. a sixth link; 53. a seventh connecting rod; 54. and an eighth link.

Detailed Description

In order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments in combination with the accompanying drawings.

As shown in fig. 1-12, the present embodiment discloses a multi-link air chuck, which includes a rotary table 1, a through hole 11 (shown in fig. 1) is formed in a central position of the rotary table 1, and when machining is performed, a workpiece passes through the through hole 11 to be clamped, so that the workpiece can move during clamping, and different positions of the workpiece can be machined. Two first cylinders 2 and two cushion blocks 3 are respectively and fixedly arranged on the front side wall of the turntable 1; the two first cylinders 2 are symmetrically distributed by taking a diameter line of the rotating disc 1 as a center (as shown in figures 3-4); the cushion blocks 3 are fixedly provided with second air cylinders 31, and the two second air cylinders 31 are symmetrically distributed by taking a diameter line of the rotary table 1 as a center (as shown in fig. 8-9); the central connecting line of the two first cylinders 2 is perpendicular to the central connecting line of the two second cylinders 31, so that the direction of the clamping force of the first cylinders 2 is perpendicular to the direction of the clamping force of the second cylinders 31, the workpiece is clamped more stably, and the workpiece is prevented from generating angle deviation during clamping. The second air cylinders 31 are installed on the rotary table 1 through the cushion blocks 3, so that the two second air cylinders 31 are positioned in front of the two first air cylinders 2 in the vertical direction, the workpieces are clamped through the second air cylinders 31 and the first air cylinders 2 in different vertical directions, and the clamping stability is improved.

A first jaw 21 (shown in fig. 3-4) is connected to each piston rod of the first cylinder 2, and the piston rod drives the first jaw 21 to clamp a workpiece. Two first centering mechanisms 4 are arranged between the two first clamping jaws 21, the two first centering mechanisms 4 are symmetrically distributed by taking a central connecting line of the two first cylinders 2 as a center, and the central connecting line of the two first centering mechanisms 4 is superposed with a diameter line of the rotary table 1; two first sliding grooves 12 are arranged on the front side wall of the turntable 1, and the positions of the two first sliding grooves 12 correspond to the positions of the two first centering mechanisms 4 respectively.

The first centering mechanism 4 comprises a first connecting rod 41, a second connecting rod 42, a third connecting rod 43 and a fourth connecting rod 44 (shown in fig. 6-7) which are sequentially hinged end to end; the other end of the first link 41 and the other end of the fourth link 44 are hinged to the ends of the two first jaws 21, respectively, so as to connect the two first jaws 21 through the first centering mechanism 4. The rear parts of the second connecting rod 42 and the third connecting rod 43 are both connected with first sliding mechanisms 13, the two first sliding mechanisms 13 are slidably mounted in the corresponding first sliding grooves 12, and the first sliding mechanisms 13 slide along the first sliding grooves 12 to guide the movement of the second connecting rod 42 and the third connecting rod 43.

When a workpiece is clamped, piston rods of the two first air cylinders 2 extend outwards to drive the two first clamping claws 21 to move towards the central position of the rotary table 1, and when the two first clamping claws 21 move, the two first clamping claws respectively drive the first connecting rod 41 and the fourth connecting rod 44 to move inwards, and the first connecting rod 41 and the fourth connecting rod 44 are respectively linked with the second connecting rod 42 and the third connecting rod 43 to move inwards along the sliding direction of the first sliding mechanism 13; because the first connecting rod 41, the second connecting rod 42, the third connecting rod 43 and the fourth connecting rod 44 are sequentially hinged end to end, under the action of a reaction force, the second connecting rod 42 and the third connecting rod 43 respectively link the first connecting rod 41 and the fourth connecting rod 44 in a linkage manner, and force the first connecting rod 41 and the fourth connecting rod 44 to move inwards; correspondingly, the first connecting rod 41 and the fourth connecting rod 44 are used for respectively linking the two first clamping claws 21 and forcing the two first clamping claws 21 to synchronously move towards the center position of the turntable 1, so that the moving distances of the two first clamping claws 21 towards the center of the turntable 1 are the same, the workpiece is symmetrically clamped, and the concentricity for clamping the workpiece can be improved. In a similar way, after the machining is completed, the piston rod of the first cylinder 2 contracts, and under the linkage action of the first centering mechanism 4, the two first clamping claws 21 synchronously move towards the direction far away from the center of the turntable 1, so that the workpiece is separated from the clamping.

The piston rods of the second cylinders 31 are connected with second claws 32 (as shown in fig. 8-9), and the piston rods drive the second claws 32 to clamp the workpiece. Two second centering mechanisms 5 are arranged between the two second clamping jaws 32, the two second centering mechanisms 5 are symmetrically distributed by taking a central connecting line of the two second cylinders 31 as a center, and the central connecting line of the two second centering mechanisms 5 is superposed with a diameter line of the rotary table 1; the front side walls of the two first cylinders 2 are respectively provided with a second sliding chute 14, and the positions of the two second sliding chutes 14 respectively correspond to the positions of the two second centering mechanisms 5.

The second centering mechanism 5 comprises a fifth connecting rod 51, a sixth connecting rod 52, a seventh connecting rod 53 and an eighth connecting rod 54 (shown in fig. 11-12) which are sequentially hinged end to end; the other end of the fifth link 51 and the other end of the eighth link 54 are hinged to the ends of the two second jaws 32, respectively, so as to connect the two second jaws 32 through the second centering mechanism 5. The rear parts of the sixth link 52 and the seventh link 53 are both connected with second sliding mechanisms 15, the two second sliding mechanisms 15 are slidably mounted in the corresponding second sliding chutes 14, and the second sliding mechanisms 15 slide along the second sliding chutes 14, so that the movement of the sixth link 52 and the seventh link 53 is guided.

When a workpiece is clamped, piston rods of the two second air cylinders 31 extend outwards to drive the two second claws 32 to move towards the central position of the turntable 1, and when the two second claws 32 move, the two second claws respectively drive the fifth connecting rod 51 and the eighth connecting rod 54 to move inwards, and the fifth connecting rod 51 and the eighth connecting rod 54 respectively link the sixth connecting rod 52 and the seventh connecting rod 53 to move inwards along the sliding direction of the second sliding mechanism 15; because the fifth connecting rod 51, the sixth connecting rod 52, the seventh connecting rod 53 and the eighth connecting rod 54 are sequentially hinged end to end, under the action of a reaction force, the sixth connecting rod 52 and the seventh connecting rod 53 respectively link the fifth connecting rod 51 and the eighth connecting rod 54, and force the fifth connecting rod 51 and the eighth connecting rod 54 to move inwards; correspondingly, the fifth connecting rod 51 and the eighth connecting rod 54 are used for respectively linking the two second clamping jaws 32 and forcing the two second clamping jaws 32 to synchronously move towards the center position of the turntable 1, so that the moving distances of the two second clamping jaws 32 towards the center of the turntable 1 are the same, the workpiece is symmetrically clamped, and the concentricity for clamping the workpiece can be improved. In a similar way, after the machining is completed, the piston rod of the second cylinder 31 contracts, and under the linkage action of the second centering mechanism 5, the two second claws 32 synchronously move towards the direction far away from the center of the turntable 1, so that the workpiece is separated from the clamping.

In summary, the first centering mechanism 4 is connected with the first claws 21 on the two first cylinders 2, so that the two first claws 21 synchronously move towards the center of the turntable 1 or synchronously move away from the center of the turntable 1; the second clamping jaws 32 on the two second cylinders 31 are connected through the second centering mechanism 5, so that the two second clamping jaws 32 synchronously move towards the center of the turntable 1 or synchronously move away from the center of the turntable 1, two-two linkage of the four cylinders on the turntable 1 is realized, the condition that each pair of clamping jaws are not concentric during clamping is avoided, and the machining precision of workpieces is improved.

As a preferred embodiment, the first cylinder 2 and the second cylinder 31 are both double-shaft cylinders, each double-shaft cylinder has two cylinder barrels, and the jaws are driven by two piston rods to clamp a workpiece, so that a larger clamping force can be provided, the operation of the jaws can be more stable, the workpiece is not easy to incline when clamped, and the workpiece machining precision is further improved.

In a preferred embodiment, the height of the cushion block 3 is greater than or equal to the height of the first air cylinder 2, the two second air cylinders 31 are positioned in front of the two first air cylinders 2, and the clamping of the workpiece by the two second jaws 32 and the clamping of the workpiece by the two first jaws 21 are in different planes in the vertical direction, so that the angular deviation of the workpiece during clamping can be reduced, and the workpiece can be clamped more stably.

As a preferred embodiment, the first jaw 21 is provided with a first roller seat 22 on one side away from the first cylinder 2, and the first roller seats 22 are provided with first rollers 23 (as shown in fig. 5) in a rolling manner, so that the first rollers 23 contact the workpiece, friction between the workpiece and the first roller seats can be reduced, the workpiece can move during clamping, and different positions can be conveniently machined. The second clamping jaws 32 are provided with second roller seats 33 on the sides far away from the second cylinder 31, the second rollers 34 are mounted on the second roller seats 33 in a rolling manner (as shown in fig. 10), and the second rollers 34 are in contact with the workpiece, so that friction between the workpiece and the second roller seats can be reduced, the workpiece can move in the clamping process, and different positions can be processed conveniently. Preferably, the number of the first rollers 23 on the first roller seat 22 is two, and the two first rollers 23 are distributed in parallel; the number of the second rollers 34 on the second roller seat 33 is two, two of the second rollers 34 are distributed in parallel, the first rollers 23 are distributed in parallel, and the second rollers 34 are distributed in parallel, so that the clamping area of the workpiece can be increased, and the clamping stability is improved.

As a preferred embodiment, first grooves 24 are formed in the middle positions of the two ends of the first jaw 21, the first grooves 24 at the two ends of one of the first jaws 21 are respectively hinged to the end portions of two first links 41 (as shown in fig. 3-4), the first grooves 24 are located in the middle positions of the end portions of the first jaws 21, the first links 41 are hinged in the corresponding first grooves 24, and the first links 41 can be positioned by the inner side walls of the first grooves 24, so that the connection stability is improved. The other first grooves 24 at the two ends of the first jaw 21 are respectively hinged to the end portions of the two fourth connecting rods 44, the first grooves 24 are located in the middle of the end portions of the first jaw 21, the fourth connecting rods 44 are hinged in the corresponding first grooves 24, the fourth connecting rods 44 can be positioned through the inner side walls of the first grooves 24, and the connecting stability is improved.

The middle positions of the two ends of the second jaw 32 are respectively provided with a second groove 35, the second grooves 35 of the two ends of one second jaw 32 are respectively hinged with the end parts of two fifth connecting rods 51 (as shown in fig. 8-9), the second grooves 35 are located in the middle positions of the end parts of the second jaw 32, the fifth connecting rods 51 are hinged in the corresponding second grooves 35, the fifth connecting rods 51 can be positioned through the inner side walls of the second grooves 35, and the connecting stability is improved. The second grooves 35 at the two ends of the second jaw 32 are respectively hinged to the end portions of the two eighth connecting rods 54, the second grooves 35 are located in the middle of the end portions of the second jaw 32, the eighth connecting rods 54 are hinged in the corresponding second grooves 35, the eighth connecting rods 54 can be positioned through the inner side walls of the second grooves 35, and the connecting stability is improved.

As a preferred embodiment, two first guide rods 25 (shown in fig. 3-4) are connected between the two first cylinders 2, and the two first guide rods 25 are symmetrically distributed around the central connecting line of the two first cylinders 2; two first guide holes 26 (as shown in fig. 5) are formed in the first clamping jaw 21, the shapes and positions of the two first guide holes 26 correspond to those of the two first guide rods 25, and the first clamping jaw 21 is slidably sleeved on the two first guide rods 25 through the two first guide holes 26, so that two ends of the first clamping jaw 21 can respectively run along the two first guide rods 25, a guiding effect is achieved, and the stability of the first clamping jaw 21 in the running process is improved.

Two second guide rods 36 (shown in fig. 8-9) are connected between the two second cylinders 31, and the two second guide rods 36 are symmetrically distributed around a central connecting line of the two second cylinders 31; two second guide holes 37 (as shown in fig. 10) are formed in the second jaw 32, the shapes and positions of the two second guide holes 37 correspond to those of the two second guide rods 36, and the second jaw 32 is slidably sleeved on the two second guide rods 36 through the two second guide holes 37, so that two ends of the second jaw 32 can respectively run along the two second guide rods 36, a guiding effect is achieved, and the stability of the second jaw 32 in the running process is improved.

As a preferred embodiment, the first sliding mechanism 13 includes a first connecting shaft 131 and a first bearing 132 (as shown in fig. 7) sleeved on the first connecting shaft 131, the first connecting shaft 131 is connected to the rear portions of the second connecting rod 42 and the third connecting rod 43, the first bearing 132 is slidably mounted in the corresponding first sliding chute 12, the outer side wall of the first bearing 132 is circular, so that the resistance to sliding in the first sliding chute 12 can be reduced, and the first bearing 132 can rotate around the first connecting shaft 131 when sliding, so that the friction between the first bearing 132 and the first sliding chute 12 can be further reduced.

The second sliding mechanism 15 includes a second connecting shaft 151 and a second bearing 152 (as shown in fig. 12) sleeved on the second connecting shaft 151, the rear portions of the sixth connecting rod 52 and the seventh connecting rod 53 are both connected with the second connecting shaft 151, the second bearing 152 is slidably mounted in the corresponding second sliding groove 14, the outer side wall of the second bearing 152 is circular, so that the resistance to sliding in the second sliding groove 14 can be reduced, and when the second bearing 152 slides, the second bearing 152 can rotate around the second connecting shaft 151, so that the friction between the second sliding groove 14 and the second sliding groove can be further reduced.

In a preferred embodiment, in the first centering mechanism 4, the first link 41, the second link 42, the third link 43 and the fourth link 44 are distributed in a W shape (as shown in fig. 6 to 7). If the first centering mechanism 4 is in the in-line distribution, the first link 41 and the second link 42, the second link 42 and the third link 43, and the third link 43 and the fourth link 44 are at the position of the dead point, so that the first link 41, the second link 42, the third link 43 and the fourth link 44 cannot rotate around the corresponding hinge point, and the piston rod is prevented from driving the first claw 21 to move toward the center of the turntable 1, and therefore the first link 41, the second link 42, the third link 43 and the fourth link 44 are arranged in the W-shaped distribution, so that the first link 41, the second link 42, the third link 43 and the fourth link 44 are prevented from being at the position of the dead point and cannot rotate.

In the second centering mechanism 5, the fifth link 51, the sixth link 52, the seventh link 53 and the eighth link 54 are distributed in a W shape (as shown in fig. 11 to 12). If the second centering mechanism 5 is in the straight distribution, the fifth link 51 and the sixth link 52, the sixth link 52 and the seventh link 53, and the seventh link 53 and the eighth link 54 are at the positions of the dead points, so that the fifth link 51, the sixth link 52, the seventh link 53 and the eighth link 54 cannot rotate around the corresponding hinge points, and the piston rod is prevented from driving the second claws 32 to move toward the center of the turntable 1, and therefore, the fifth link 51, the sixth link 52, the seventh link 53 and the eighth link 54 are arranged in the W-shaped distribution, so that the fifth link 51, the sixth link 52, the seventh link 53 and the eighth link 54 are prevented from being at the positions of the dead points and cannot rotate.

In addition, in the utility model, the link mechanism which is composed of four connecting rods and distributed in a W shape has smaller length compared with the link mechanism which is composed of two connecting rods and distributed in a V shape, so that the deformation generated after the stress is smaller, the strength is better, and the service life of the link mechanism can be prolonged; in addition, compared with a V-shaped connecting rod mechanism, in the linkage process of the W-shaped connecting rod mechanism, the chuck space occupied by the movement of the connecting rod is smaller, and the influence of the movement of the connecting rod on other parts on the chuck can be reduced.

In a preferred embodiment, the first link 41, the fourth link 44, the fifth link 51 and the eighth link 54 have the same length, and the second link 42, the third link 43, the sixth link 52 and the seventh link 53 have the same length, so that the synchronized linkage distance of the first centering mechanism 4 to the first jaw 21 is the same as the synchronized linkage distance of the second centering mechanism 5 to the second jaw 32, thereby improving the concentricity when clamping the workpiece.

To sum up, the multi-connecting rod type pneumatic chuck of the present invention connects the first claws of the two first cylinders through the first centering mechanism, so that the two first claws move to the center of the turntable synchronously or keep away from the center of the turntable synchronously; the second clamping jaws on the two second cylinders are connected through the second centering mechanism, so that the two second clamping jaws move towards the center of the turntable synchronously or are away from the center of the turntable synchronously, two-two linkage of the four cylinders on the turntable is realized, the condition that each pair of clamping jaws are not concentric during clamping is avoided, and the machining precision of workpieces is improved.

The parts of the present invention not described in detail are the known techniques of those skilled in the art. Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims (10)

1. The utility model provides a multi-link formula air chuck, includes carousel (1), its characterized in that: a through hole (11) is formed in the center of the turntable (1); two first cylinders (2) and two cushion blocks (3) are respectively and fixedly arranged on the front side wall of the turntable (1); the two first air cylinders (2) are symmetrically distributed by taking a diameter line of the rotating disc (1) as a center; the cushion blocks (3) are fixedly provided with second cylinders (31), and the two second cylinders (31) are symmetrically distributed by taking a diameter line of the turntable (1) as a center; the central connecting line of the two first cylinders (2) is vertical to the central connecting line of the two second cylinders (31);

a piston rod of the first cylinder (2) is connected with a first clamping jaw (21); two first centering mechanisms (4) are arranged between the two first clamping jaws (21), the two first centering mechanisms (4) are symmetrically distributed by taking a central connecting line of the two first cylinders (2) as a center, and the central connecting line of the two first centering mechanisms (4) is coincident with a diameter line of the turntable (1); two first sliding chutes (12) are arranged on the front side wall of the turntable (1), and the positions of the two first sliding chutes (12) correspond to the positions of the two first centering mechanisms (4) respectively;

the first centering mechanism (4) comprises a first connecting rod (41), a second connecting rod (42), a third connecting rod (43) and a fourth connecting rod (44) which are sequentially hinged end to end; the other end of the first connecting rod (41) and the other end of the fourth connecting rod (44) are respectively hinged with the end parts of the two first claws (21); the rear parts of the second connecting rod (42) and the third connecting rod (43) are connected with first sliding mechanisms (13), and the two first sliding mechanisms (13) are slidably installed in corresponding first sliding grooves (12);

a piston rod of the second cylinder (31) is connected with a second clamping jaw (32); two second centering mechanisms (5) are arranged between the two second clamping jaws (32), the two second centering mechanisms (5) are symmetrically distributed by taking a central connecting line of the two second cylinders (31) as a center, and the central connecting line of the two second centering mechanisms (5) is coincident with a diameter line of the turntable (1); second sliding grooves (14) are formed in the front side walls of the two first cylinders (2), and the positions of the two second sliding grooves (14) correspond to the positions of the two second centering mechanisms (5) respectively;

the second centering mechanism (5) comprises a fifth connecting rod (51), a sixth connecting rod (52), a seventh connecting rod (53) and an eighth connecting rod (54) which are sequentially hinged end to end; the other end of the fifth connecting rod (51) and the other end of the eighth connecting rod (54) are respectively hinged with the end parts of the two second claws (32); and the rear parts of the sixth connecting rod (52) and the seventh connecting rod (53) are connected with second sliding mechanisms (15), and the two second sliding mechanisms (15) are arranged in corresponding second sliding grooves (14) in a sliding manner.

2. The multi-link pneumatic chuck of claim 1, wherein: the first cylinder (2) and the second cylinder (31) are both double-shaft cylinders.

3. The multi-link pneumatic chuck of claim 1, wherein: the height of the cushion block (3) is larger than or equal to that of the first cylinder (2).

4. The multi-link pneumatic chuck of claim 1, wherein: one side of the first clamping jaw (21), which is far away from the first cylinder (2), is provided with a first roller base (22), and first rollers (23) are arranged on the first roller base (22) in a rolling manner; and second roller bases (33) are arranged on the sides, far away from the second air cylinder (31), of the second clamping jaws (32), and second rollers (34) are arranged on the second roller bases (33) in a rolling mode.

5. The multi-link pneumatic chuck of claim 4, wherein: the number of the first rollers (23) on the first roller seat (22) is two, and the two first rollers (23) are distributed in parallel; the number of the second rollers (34) on the second roller seat (33) is two, and the two second rollers (34) are distributed in parallel.

6. The multi-link pneumatic chuck of claim 1, wherein: first grooves (24) are formed in the middle positions of two ends of each first jaw (21), the first grooves (24) at two ends of one first jaw (21) are hinged to the end portions of two first connecting rods (41), and the first grooves (24) at two ends of the other first jaw (21) are hinged to the end portions of two fourth connecting rods (44);

second grooves (35) are formed in the middle positions of two ends of each second clamping jaw (32), the second grooves (35) at two ends of one second clamping jaw (32) are hinged to the end portions of the two fifth connecting rods (51) respectively, and the second grooves (35) at two ends of the other second clamping jaw (32) are hinged to the end portions of the two eighth connecting rods (54) respectively.

7. The multi-link pneumatic chuck of claim 1, wherein: two first guide rods (25) are connected between the two first cylinders (2), and the two first guide rods (25) are symmetrically distributed by taking the central connecting line of the two first cylinders (2) as the center; two first guide holes (26) are formed in the first clamping jaw (21), the shapes and the positions of the two first guide holes (26) correspond to those of the two first guide rods (25), and the first clamping jaw (21) is slidably sleeved on the two first guide rods (25) through the two first guide holes (26);

two second guide rods (36) are connected between the two second cylinders (31), and the two second guide rods (36) are symmetrically distributed by taking the central connecting line of the two second cylinders (31) as the center; two second guide holes (37) are formed in the second clamping jaw (32), the shape and the position of the two second guide holes (37) correspond to those of the two second guide rods (36), and the second clamping jaw (32) is slidably sleeved on the two second guide rods (36) through the two second guide holes (37).

8. The multi-link pneumatic chuck of claim 1, wherein: the first sliding mechanism (13) comprises a first connecting shaft (131) and a first bearing (132) sleeved on the first connecting shaft (131), the rear parts of the second connecting rod (42) and the third connecting rod (43) are connected with the first connecting shaft (131), and the first bearing (132) is slidably mounted in the corresponding first sliding groove (12);

the second sliding mechanism (15) comprises a second connecting shaft (151) and a second bearing (152) sleeved on the second connecting shaft (151), the rear portions of the sixth connecting rod (52) and the seventh connecting rod (53) are connected with the second connecting shaft (151), and the second bearing (152) is slidably mounted in the corresponding second sliding groove (14).

9. The multi-link pneumatic chuck of claim 1, wherein: in the first centering mechanism (4), the first connecting rod (41), the second connecting rod (42), the third connecting rod (43) and the fourth connecting rod (44) are distributed in a W shape; in the second centering mechanism (5), the fifth link (51), the sixth link (52), the seventh link (53), and the eighth link (54) are distributed in a W shape.

10. The multi-link pneumatic chuck of claim 1, wherein: the first connecting rod (41), the fourth connecting rod (44), the fifth connecting rod (51) and the eighth connecting rod (54) are equal in length, and the second connecting rod (42), the third connecting rod (43), the sixth connecting rod (52) and the seventh connecting rod (53) are equal in length.

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