Adjustable finger-shaped chuck

Abstract

The utility model provides an adjustable finger-shaped chuck, and belongs to the technical field of machinery. The clamp solves the problem that when an existing clamp is used for clamping the side portions of thin-wall parts, the parts are prone to deformation. The adjustable finger-shaped chuck comprises a main body with a disc-shaped base disc, a positioning finger, a floating pull head, a pull disc and a pull column, the floating pull head is in a rod shape, one end of the floating pull head is axially fixed to the pull disc, a plurality of first sliding grooves are formed in the base disc in the radial direction, and a plurality of second sliding grooves are correspondingly formed in the pull disc. The rear ends of the pull columns penetrate through the first sliding grooves and the second sliding grooves in a one-to-one correspondence mode respectively, the pull columns can move back and forth along the first sliding grooves and the second sliding grooves and are positioned, the number of the positioning fingers is the same as that of the pull columns, and the positioning fingers are fixed to the front ends of the pull columns in a one-to-one correspondence mode. One side of each positioning finger extends out of the side face of the corresponding pull column to form a positioning part. The adjustable finger-shaped chuck has the advantage of being good in clamping effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to an adjustable finger chuck. Background Art

[0002] When machining parts, it is often necessary to first clamp the outer side of the part with a fixture to fix the part, and then use a tool to machine the surface of the part, such as turning. Since the shapes of parts are diverse, a variety of different fixtures are required to clamp them for machining.

[0003] Among them, when clamping the outer side of thin-walled parts, due to the small thickness of the side part, the parts are extremely easy to deform during clamping and are not suitable for being clamped and fixed by fixtures for clamping the outer side of the parts.

[0004] Therefore, it is very necessary to design a fixture that can clamp and fix the end face of the part. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the problem that the parts are easy to deform when the existing fixture clamps the side parts of thin-walled parts, and a kind of adjustable finger chuck is proposed in view of the above problems existing in the prior art.

[0006] The purpose of the utility model can be realized by the following technical solutions:

[0007] An adjustable finger chuck includes a main body with a disc-shaped base plate. The adjustable finger chuck is characterized in that it further includes positioning fingers, a floating pull head in the shape of a rod, a pull disc in the shape of a disc, and several pull columns all in the shape of round rods. The pull disc is arranged in the main body. The floating pull head is in the shape of a rod, one end of which is axially fixed to the pull disc, and the other end passes through the pull disc from the rear side of the pull disc. A plurality of first chutes are radially formed on the base plate, and a plurality of second chutes corresponding to the first chutes are formed on the pull disc. The number of the first chutes, the second chutes is the same as that of the pull columns and they are arranged in one-to-one correspondence. The rear ends of the several pull columns respectively pass through the several first chutes and the second chutes one by one, and the pull columns can move back and forth along the first chutes and the second chutes and be positioned. The several pull columns are evenly distributed around the center of the base plate and the several pull columns are axially fixed to the pull disc. The number of the positioning fingers is the same as that of the pull columns and they are fixedly arranged at the front ends of the several pull columns in one-to-one correspondence. One side of the several positioning fingers extends out of the side surface of the corresponding pull column to form a positioning part.

[0008] In this adjustable finger chuck, taking the side of the main body used for clamping parts as the front side, the opposite side is the rear side. During installation, the output end of a driving device, such as a cylinder, is fixedly connected to the end of the floating pull head that passes through the pull plate, that is, the rear end, for driving the axial movement of the floating pull head. When in use, the parts are placed at the central position on the front side of the base plate in a manual or robot feeding manner, that is, between several pull columns. The driving device drives the floating pull head to move backward, thereby driving the pull plate and the pull columns to move backward together, driving the positioning fingers fixed at the front ends of the pull columns to move backward, and pressing the parts against the base plate by relying on the positioning parts that protrude from the sides of the pull columns to abut against the end faces of the parts, so as to realize the clamping and fixing of thin-walled workpieces. Here, relying on the end-face clamping method, compared with the side clamping method, it is not easy to deform thin-walled workpieces, and the clamping effect is good. In addition, for parts with different diameters or non-circular parts, the radial position of the pull columns relative to the base plate can be adjusted along the directions of the first chute and the second chute to achieve adaptive clamping, and the applicable range is wider.

[0009] In the above-mentioned adjustable finger chuck, several cylindrical pull seats are connected to the front side of the base plate. The number of the pull seats is the same as the number of the pull columns, and the several pull seats are sleeved outside the several pull columns in a one-to-one correspondence. Relying on the pull seats being sleeved outside the pull columns to provide guidance for the axial movement of the pull columns and support for the pull columns and the positioning fingers when clamping parts, ensuring the stability of clamping.

[0010] In the above-mentioned adjustable finger chuck, the sides of the pull columns all have long strip-shaped guide grooves. Pins are fixed on the pull seats, and one end of the pin correspondingly extends into the guide groove. When the pull plate drives the pull columns to move backward, the pin can move along the guide groove, enabling the pull columns to rotate circumferentially relative to the pull seats and making the positioning part rotate with the pull columns to a position facing the center of the base plate. The settings of the guide groove and the pin enable the pull columns to rotate circumferentially during the process of the pull plate driving the pull columns to move axially, so that when clamping parts, the positioning part faces the center of the base plate, and when loosening the parts, the positioning part faces the other side relative to the center of the base plate, facilitating loading and unloading and avoiding bumping or interference with the positioning part.

[0011] In the above-mentioned adjustable finger chuck, the guide groove includes a turning groove and a directional groove that are both in the shape of long strips. The turning groove is inclined relative to the axis of the pull column. The length direction of the directional groove is consistent with the axial direction of the pull column. The directional groove is located in front of the turning groove, and the rear end of the directional groove is communicated with one end of the turning groove. The turning groove is inclined to cooperate with the pin to drive the circumferential rotation of the pull column, and the opening of the directional groove enables the pull column to maintain the angle unchanged and continue to move backward after turning to the clamping angle during the backward movement, ensuring the stability of the clamping process.

[0012] In the above-mentioned adjustable finger chuck, the positioning finger is flat and is arranged perpendicular to the axis of the pull rod. Both the front side and the rear side of the positioning finger are planes. The plane is more conducive to the abutting positioning between the positioning finger and the end face of the part.

[0013] In the above-mentioned adjustable finger chuck, a through hole is formed through the center of the pull plate. A recessed notch is formed in the middle of the front side of the pull plate around the through hole. The front end of the floating pull head passes forward through the through hole, and an outwardly protruding annular retaining edge is formed on the outer side of the front end of the floating pull head. The retaining edge is located in the notch. A plate-shaped end cover is fixed at the opening of the notch of the pull plate. The axial positioning of the front end of the floating pull head is realized through the pull plate and the end cover, and the installation is relatively convenient.

[0014] In the above-mentioned adjustable finger chuck, one end of the pull seat facing the base plate has a connecting seat. A block-shaped slider is arranged on the other side of the base plate relative to the pull seat. The connecting seat and the slider are respectively arranged on both sides of the first sliding groove and can move back and forth along the first sliding groove. The connecting seat and the slider are connected by a fastener. The arrangement of the connecting seat and the slider makes it only necessary to slightly loosen the fastener when adjusting the position of the pull rod, and then re-lock it after adjusting the position, and the operation is relatively convenient.

[0015] Compared with the prior art, the clamping of this adjustable finger chuck depends on the end face clamping method. Compared with the side clamping method, it is not easy to deform thin-walled workpieces, and the clamping effect is good. In addition, for parts with different diameters or non-circular parts, the relative radial position of the pull rod relative to the base plate can be adjusted along the directions of the first sliding groove and the second sliding groove to achieve adaptive clamping, and the application range is wider. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the adjustable finger chuck when clamping a part.

[0017] Figure 2 is a schematic cross-sectional structural diagram of the adjustable finger chuck when clamping a part.

[0018] Figure 3 is a schematic structural diagram of the pull rod in the adjustable finger chuck.

[0019] In the figure, 1, main body; 11, base plate; 11a, first sliding groove; 2, positioning finger; 21, positioning part; 3, floating pull head; 31, retaining edge; 4, pull plate; 41, second sliding groove; 42, through hole; 43, notch; 5, pull rod; 51, guiding groove; 51a, turning groove; 51b, orienting groove; 6, limiting part; 7, pull seat; 71, connecting seat; 8, end cover; 9, part. DETAILED DESCRIPTION OF THE INVENTION

[0020] The following are specific embodiments of the present utility model and, in conjunction with the accompanying drawings, further describe the technical solutions of the present utility model. However, the present utility model is not limited to these embodiments.

[0021] As Figure 1 and Figure 2 shown, the adjustable finger chuck of the present invention includes a main body 1 having a disc-shaped base plate 11, a flat positioning finger 2, a floating pull head 3 in the shape of a round rod, a pull plate 4 in the shape of a disc, and several pull columns 5 all in the shape of round rods.

[0022] For the convenience of description, the side of the base plate 11 where the part 9 is provided is defined as the front side, and the other side is the rear side.

[0023] The pull plate 4 is arranged in the cavity inside the main body 1 and is parallel to the base plate 11. The axial length of the cavity inside the main body 1 is greater than the axial length of the pull plate 4, so that the pull plate 4 can axially move inside the main body 1. A through hole 42 is axially penetrated through the center of the pull plate 4. In the middle of the front side of the pull plate 4, there is a recessed notch 43 around the through hole 42. The front end of the floating pull head 3 passes forward through the through hole 42, and on the outside of the front end of the floating pull head 3, there is a circular ring-shaped stop edge 31 protruding outward. The stop edge 31 is located in the notch 43 and can abut against the bottom of the notch 43. A plate-shaped end cover 8 is fixed at the opening of the notch 43 of the pull plate 4. The floating pull head 3 is axially fixed on the pull plate 4 through the end cover 8. The rear end of the floating pull head 3 passes backward through the rear side of the pull plate 4, and a threaded hole is provided inside the rear end of the floating pull head 3 for connecting with the driving device.

[0024] Three straight-slot-shaped second chutes 41 are formed on the pull plate 4. The three second chutes 41 are all axially penetrated through the pull plate 4, and the length direction of the second chutes 41 is the radial direction of the pull plate 4. The three second chutes 41 are evenly distributed around the center of the pull plate 4. In this embodiment, the three second chutes 41 are all stepped chutes, that is, the second chutes 41 are divided into two parts axially. The groove width of the rear part is greater than that of the front part, and a stepped surface is formed between them.

[0025] Correspondingly, three straight-slot-shaped first chutes 11a are formed on the base plate 11. The three first chutes 11a are all axially penetrated through the base plate 11, and the length direction of the first chutes 11a is the radial direction of the base plate 11. The three first chutes 11a are evenly distributed around the center of the base plate 11. In this embodiment, the positions of the three first chutes 11a correspond to those of the three second chutes 41 one by one; the first chutes 11a are also stepped chutes, that is, the first chutes 11a are divided into two parts axially. The groove width of the rear part is greater than that of the front part, and a stepped surface is formed between them.

[0026] The number of the pull columns 5 is also three, and they are arranged in one-to-one correspondence with the first chute 11a and the second chute 41, and the three pull columns 5 are all perpendicular to the base plate 11. The rear ends of the three pull columns 5 respectively pass through the three first chutes 11a and the second chute 41 one by one, and the pull columns 5 can move back and forth along the first chute 11a and the second chute 41. Threaded connection with an annular limiting part 6 is carried out at the rear ends of the three pull columns 5. The limiting part 6 is partially located in the second chute 41, and the front end face of the limiting part 6 abuts against the step surface in the second chute 41. An annular convex shoulder protruding is arranged on the outer side of the rear end of the pull column 5, and the convex shoulder abuts against the front side of the pull plate 4. Through the arrangement of the convex shoulder and the limiting part 6, the pull plate 4 and the pull column 5 are axially fixed. The number of the positioning fingers 2 is three, and they are arranged perpendicular to the axis of the pull column 5. The front side and the rear side of the positioning finger 2 are both planes. The positioning finger 2 is fixed on the front end face of the pull column 5 through a fastener. One side of the positioning finger 2 extends out of the side surface of the corresponding pull column 5 to form a positioning part 21 for positioning the part 9.

[0027] Several cylindrical pull seats 7 are arranged on the front side of the base plate 11. The number of the pull seats 7 is the same as that of the pull columns 5, and the three pull seats 7 are sleeved on the outer sides of the three pull columns 5 one by one. One end of the pull seat 7 facing the base plate 11 has a connecting seat 71, and the connecting seat 71 is partially embedded in the first chute 11a. A block-shaped slider is arranged on the other side of the base plate 11 relative to the pull seat 7. The connecting seat 71 and the slider are respectively arranged on both sides of the first chute 11a and can move back and forth along the first chute 11a. The connecting seat 71 and the slider are connected through a fastener. In this embodiment, the slider is arranged inside the rear side of the first chute 11a, and the front end face of the slider abuts against the step surface of the first chute 11a.

[0028] Long strip-shaped guide grooves 51 are arranged on the side parts of the pull columns 5. Plug pins are fixed on the side parts of the pull seats 7, and one end of the plug pin correspondingly extends into the guide groove 51. When the pull plate 4 drives the pull column 5 to move backward, the plug pin can move along the guide groove 51, and the pull column 5 rotates circumferentially relative to the pull seat 7, and the positioning part 21 rotates along with the pull column 5 to a position facing the center of the base plate 11. As Figure 3 shown, in this embodiment, the guide groove 51 includes a turning groove 51a and a directional groove 51b that are both in the shape of long strips. The turning groove 51a is arranged obliquely relative to the axis of the pull column 5. The length direction of the directional groove 51b is consistent with the axial direction of the pull column 5. The directional groove 51b is located in front of the turning groove 51a, and the rear end of the directional groove 51b is communicated with one end of the turning groove 51a, and the communication part is in arc transition.

[0029] When this adjustable finger chuck is installed, the output end of a driving device, such as a cylinder, is threadedly connected to the rear end of the floating pull head 3 for driving the floating pull head 3 to move axially.

[0030] When the part 9 is not clamped, the driving device pushes the floating pull head 3 forward, driving the pull plate 4 to move forward. The pull plate 4 acts on the shoulder of the pull column 5, driving the pull column 5 to move forward. Since the pull seat 7 does not move axially, the pin on the pull seat 7 does not move. However, relative to the pull column 5, the pin slides along the guide groove 51. When the pin slides to the steering groove 51a, the pull column 5 rotates circumferentially relative to the pull seat 7, driving the positioning finger 2 at the front end of the pull column 5 to rotate, so that the positioning portion 21 rotates away from the center of the base, vacating the position between the three pull columns 5 to facilitate the placement of the part 9.

[0031] During use, the part 9 is placed at the central position on the front side of the base plate 11, that is, between the three pull columns 5, in a manual or robot feeding manner. The driving device drives the floating pull head 3 to move backward, driving the pull plate 4 to move backward. The pull column 5 limited by the limiting portion 6 and the pull plate 4 moves backward together with the pull plate 4, thereby driving the positioning finger 2 fixed at the front end of the pull column 5 to move backward. During the backward movement of the positioning finger 2, relying on the cooperation of the pin and the guide groove 51, it rotates reversely, so that the positioning portion 21 rotates towards the center of the base. At this time, the pin moves into the orientation groove 51b, and the pull column 5 stops rotating and continues to move backward with the pull plate 4. The part 9 is tightly pressed on the base plate 11 by relying on the positioning portion 21 where the positioning finger 2 extends out of the side of the pull column 5 to abut against the end face of the part 9, so as to realize the clamping and fixing of the thin-walled workpiece.

[0032] For parts 9 with different diameters or non-circular parts 9, the fastener connecting the connecting seat 71 and the slider can be loosened, and the radial position of the pull column 5 relative to the base plate 11 can be adjusted by moving along the first chute 11a and the second chute 41. After the position adjustment is completed, the fastener is locked again. In this embodiment, the fasteners mentioned above all adopt screws.

[0033] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An adjustable finger chuck, comprising a main body (1) having a disc-shaped base plate (11), characterized in that: The adjustable finger-shaped chuck also includes a positioning finger (2), a rod-shaped floating pull head (3), a disk-shaped pull plate (4), and a plurality of pull columns (5) all in the shape of round rods. The pull plate (4) is arranged in the main body (1). The floating pull head (3) is rod-shaped, one end of which is axially fixed to the pull plate (4), and the other end passes through the pull plate (4) from the rear side of the pull plate (4). The base plate (11) is provided with a plurality of first slide grooves (11a) in the radial direction, and the pull plate (4) is provided with a plurality of second slide grooves (41) correspondingly. The number of the first slide grooves (11a) and the second slide grooves (41) is the same as the number of the pull columns (5), and the number of the first slide grooves (11a) and the second slide grooves (41) is the same as the number of the pull columns (5). The pull columns (5) are arranged in a one-to-one correspondence, the rear ends of the plurality of pull columns (5) respectively pass through the plurality of slide grooves 1 (11a) and the slide grooves 2 (41) in a one-to-one correspondence, and the pull columns (5) can move back and forth along the slide grooves 1 (11a) and the slide grooves 2 (41) and be positioned, the plurality of pull columns (5) are evenly distributed around the center of the base plate (11), and the plurality of pull columns (5) are axially fixed to the pull plate (4), the number of the positioning fingers (2) is the same as the number of the pull columns (5) and they are fixed in a one-to-one correspondence to the front ends of the plurality of pull columns (5), and one side of the plurality of positioning fingers (2) extends out of the side surface of the corresponding pull column (5) to form a positioning portion (21).

2. An adjustable finger chuck according to claim 1, characterized in that: The front side of the base plate (11) is connected to a plurality of cylindrical pull seats (7), the number of the pull seats (7) is the same as the number of the pull posts (5), and the plurality of pull seats (7) are sleeved on the outside of the plurality of pull posts (5) in a one-to-one correspondence.

3. An adjustable finger chuck according to claim 2, characterized in that: The side of the pulling column (5) is provided with a long strip-shaped guide groove (51), and the pulling seat (7) is fixed with a latch, and one end of the latch extends into the guiding groove (51) accordingly. When the pulling plate (4) drives the pulling column (5) to move backward, the latch can move along the guiding groove (51) and make the pulling column (5) rotate circumferentially relative to the pulling seat (7) and make the positioning portion (21) rotate with the pulling column (5) to a position facing the center of the base plate (11).

4. An adjustable finger chuck according to claim 3, characterized in that: The guide groove (51) comprises a steering groove (51a) and an orientation groove (51b) both of which are in the shape of long strips. The steering groove (51a) is arranged obliquely relative to the axis of the pulling column (5). The length direction of the orientation groove (51b) is consistent with the axial direction of the pulling column (5). The orientation groove (51b) is located at the front side of the steering groove (51a) and the rear end of the orientation groove (51b) is connected to one end of the steering groove (51a).

5. An adjustable finger chuck according to any one of claims 1 to 4, characterized in that: The positioning finger (2) is flat and is arranged perpendicular to the axis of the pulling column (5); the front side surface and the rear side surface of the positioning finger (2) are both planes.

6. An adjustable finger chuck according to any one of claims 1 to 4, characterized in that: A through hole (42) is formed through the center of the pull plate (4), and a concave notch (43) is formed around the through hole (42) in the middle of the front side of the pull plate (4). The front end of the floating slider (3) passes through the through hole (42) forward, and the outer side of the front end of the floating slider (3) has a circular ring-shaped retaining edge (31) protruding outward, and the retaining edge (31) is located in the notch (43). A plate-shaped end cover (8) is fixed at the opening of the notch (43) of the pull plate (4).

7. An adjustable finger chuck according to claim 2, 3 or 4, characterized in that: The pull seat (7) has a connecting seat (71) at one end facing the base plate (11), and a block-shaped sliding block is arranged on the other side of the base plate (11) relative to the pull seat (7). The connecting seat (71) and the sliding block are respectively arranged on both sides of the slide groove (11a) and can move back and forth along the slide groove (11a), and the connecting seat (71) and the sliding block are connected by a fastener.

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