Self-adaptive quick positioning clamp

Abstract

The utility model discloses a self-adaptive quick positioning clamp which comprises a moving seat, a channel, a clamping seat, a screw rod and a screw sleeve. According to the self-adaptive rapid positioning clamp, two moving seats are symmetrically arranged in the positioning clamp, channels are symmetrically formed in the positions, corresponding to the top faces of the moving seats, of the top face of the positioning clamp, clamping seats are symmetrically connected into the channels in a sliding mode, the clamping seats are fixedly connected to the moving seats, and the bottoms of the clamping seats penetrate through the channels; guide rods are jointly and symmetrically connected to the moving seats in a sliding and penetrating mode, a lead screw is movably connected to the middles of the moving seats in a penetrating mode, the lead screw is rotated through a rotating handle, the lead screw can drive the moving seat provided with a screw sleeve to move towards the middle, and meanwhile the moving moving seat drives the other moving seat to move synchronously through cooperation of a rack and a gear. And during clamping, the two moving seats synchronously move in the middle, and compared with the mode that one moving seat moves, the lead screw can rotate by fewer turns, and middle clamping and fixing are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fixture, concretely is a kind of self-adapting quick positioning fixture. BACKGROUND

[0002] Fixture refers to when the workpiece is machined on machine tool, so that the surface of workpiece can reach the size, geometry shape and mutual position accuracy of other surface of technical requirement specified in drawing, before machining, workpiece must be installed (positioned), clamped (clamped) firmly.

[0003] According to the patent file with the announcement number CN219212847U, a positioning fixture for automobile hub machining is disclosed, which comprises an automobile hub, the automobile hub is installed at the upper end of the positioning fixture, a channel is arranged in the positioning fixture, a lead screw is installed in the channel, one end of the lead screw penetrates the tail of the positioning fixture, the other end of the lead screw is inserted into the inner wall of the positioning fixture, the lead screw is engaged with a screw seat, a movable clamp block is installed at the upper end of the screw seat, the clamping surfaces of the movable clamp block and the fixed clamp block are provided with arc-shaped clamping plates, the fixed clamp block is installed on the top surface of the positioning fixture and is biased towards the front end, a positioning pin is arranged between the fixed clamp block and the movable clamp block, and the positioning pin is fixed on a circular recess provided on the positioning fixture. The positioning fixture for automobile hub machining can clamp the outer diameter of the automobile hub through two groups of arc-shaped clamping plates, and can also position and clamp the upper and lower ends of the automobile hub through the positioning pin and the locking nut.

[0004] In the above-mentioned prior art, only one movable clamp block moves, which results in a large single stroke during movement and clamping, and a large number of turns are required to achieve clamping and fixing, which affects the clamping and positioning speed. Therefore, a new self-adapting quick positioning fixture is proposed to optimize the above-mentioned prior art. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a self-adapting quick positioning fixture to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] An adaptive rapid positioning fixture includes a positioning fixture for placing a wheel hub. The positioning fixture has two symmetrically arranged movable seats inside. A groove is symmetrically formed on the top surface of the positioning fixture corresponding to the top surface of the movable seats. A clamping seat is symmetrically slidably connected within the groove, and the clamping seat is fixedly connected to the movable seat. The bottom of the clamping seat passes through the groove. A guide rod is symmetrically slidably connected through the movable seats. A circular hole is formed on the movable seat for the guide rod to pass through and slide. The guide rod is fixedly connected to the positioning fixture. A lead screw is movably connected through the middle of the movable seat. A slot is formed on the movable seat for the lead screw to pass through and avoid obstacles. A matching threaded sleeve is fixedly installed in the avoidance slot on one of the movable seats. The threaded sleeve is fixedly installed to the movable seat by bolts. The threaded sleeve buffers the slot on the movable seat. The threaded sleeve is threaded onto the outside of the lead screw and is compatible with the lead screw. The lead screw is rotatably connected inside the positioning fixture, with one end protruding from the positioning fixture. A linkage mechanism is provided between the two sides of the movable seats.

[0008] As a further embodiment of this utility model: the linkage mechanism includes two racks arranged in an alternating manner and a gear disposed between the two racks. The racks are respectively fixedly connected to the corresponding movable seats, the racks are slidably connected to the inner side of the positioning fixture, and the gear is rotatably connected to the inner side of the positioning fixture and simultaneously meshes with the two racks for transmission.

[0009] As a further improvement of this utility model: springs are sleeved on both ends of the guide rod, and the springs are disposed between the end face of the movable seat and the inner wall of the positioning fixture.

[0010] As a further improvement of this utility model, a rotating handle is fixedly connected to one end of the lead screw extending from the positioning clamp.

[0011] As a further improvement of this utility model: the bottom surface of the positioning fixture is fixedly connected to a fixing ring, and the fixing ring is symmetrically provided with fixing holes. The fixture is fixedly installed on the processing platform by fasteners in conjunction with the fixing ring and fixing holes.

[0012] As a further embodiment of this utility model: each clamping seat is symmetrically and fixedly connected with a clamping arm, and each end of the clamping arm is rotatably and through-connected with a rotating shaft. A circular arc clamping rod is fixedly connected to the rotating shaft, and a clamping column is fixedly connected to the end of the circular arc clamping rod. An avoidance cavity for the movement of the circular arc clamping rod is provided on the clamping arm.

[0013] As a further embodiment of this utility model: an arc-shaped limiting groove is provided at the end of the rotating shaft, and a stop protrusion is provided on the clamping arm corresponding to the arc-shaped limiting groove. The stop protrusion is inserted into the arc-shaped limiting groove and is adapted to the arc-shaped limiting groove. A torsion spring is sleeved on the outside of the rotating shaft. One end of the torsion spring is fixedly connected to the arc-shaped clamping rod, and the other end of the torsion spring is fixedly connected to the clamping arm. A notch for installing the torsion spring is provided on the arc-shaped clamping rod.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model uses a rotating handle to rotate a lead screw, which drives a movable seat with a lead sleeve to move towards the center. At the same time, the moving movable seat drives another movable seat to move synchronously through the cooperation of a rack and pinion, thereby clamping the hub in the center. When clamping, the two movable seats move synchronously in the center. Compared with the movement of only one movable seat, the lead screw can rotate fewer times to achieve centered clamping and fixation.

[0016] 2. The clamping seat of this utility model uses a clamping arm to drive an arc-shaped clamping rod to clamp the wheel hub. When the arc-shaped clamping rod clamps, it presses the wheel hub tightly through the clamping column. The arc-shaped clamping rod can be rotated by a rotating shaft, which makes it convenient to adapt to wheel hubs of different diameters for multi-point clamping and fixing.

[0017] 3. The rotating shaft of this utility model limits the rotation angle through the stop protrusion and the arc-shaped limiting groove, and the rotating shaft is twisted by the torsion spring, so that the arc clamping rod can be kept at an initial angle, which makes it convenient for the arc clamping rod to drive the clamping column to abut against the hub, avoiding the problem of failure to clamp due to the initial position deviation of the arc clamping rod. Attached Figure Description

[0018] Fig. 1 This is a schematic diagram of an adaptive rapid positioning fixture.

[0019] Fig. 2 This is an enlarged view of A in an adaptive rapid positioning fixture.

[0020] Fig. 3 This is a top-view perspective view of an adaptive rapid positioning fixture.

[0021] Fig. 4 This is a cross-sectional view of an adaptive rapid positioning fixture.

[0022] In the diagram: 1. Positioning clamp; 2. Moving seat; 3. Channel; 4. Clamping seat; 5. Guide rod; 6. Lead screw; 7. Lead sleeve; 8. Linkage mechanism; 9. Rack; 10. Gear; 11. Spring; 12. Rotary handle; 13. Fixing ring; 14. Clamping arm; 15. Rotating shaft; 16. Arc-shaped clamping rod; 17. Clamping column; 18. Torsion spring; 19. Arc-shaped limiting groove; 20. Stop protrusion. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figs. 1-4 In this embodiment of the invention, an adaptive rapid positioning fixture includes a positioning fixture 1 for placing a wheel hub. Two movable seats 2 are symmetrically arranged inside the positioning fixture 1. A groove 3 is symmetrically formed on the top surface of the positioning fixture 1 corresponding to the top surface of the movable seats 2. A clamping seat 4 is symmetrically slidably connected within the groove 3. The clamping seat 4 is fixedly connected to the movable seats 2. The bottom of the clamping seat 4 passes through the groove 3. A guide rod 5 is symmetrically slidably connected through the movable seats 2. A circular hole is formed on the movable seats 2 for the guide rod 5 to pass through and slide. The guide rod 5... The positioning fixture 1 is fixedly connected, and the middle of the movable seat 2 is movably connected to the lead screw 6. The movable seat 2 has a slot for the lead screw 6 to pass through and avoid. A matching threaded sleeve 7 is fixedly installed in the avoidance slot on one of the movable seats 2. The threaded sleeve 7 is fixedly installed to the movable seat 2 by bolts. The threaded sleeve 7 buffers the slot on the movable seat 2. The threaded sleeve 7 is threaded on the outside of the lead screw 6 and is compatible with the lead screw 6. The lead screw 6 is rotatably connected in the positioning fixture 1 and one end of it passes through the positioning fixture 1. A linkage mechanism 8 is provided between the two sides of the movable seat 2.

[0025] The linkage mechanism 8 includes two racks 9 arranged in an alternating manner and a gear 10 disposed between the two racks 9. The racks 9 are fixedly connected to the corresponding movable seats 2 respectively. The racks 9 are slidably connected to the inner side of the positioning fixture 1. The gear 10 is rotatably connected to the inner side of the positioning fixture 1 and simultaneously meshes with the two racks 9 for transmission.

[0026] The lead screw 6 extends out of the positioning clamp 1 and is fixedly connected to the handle 12.

[0027] Rotating the lead screw 6 by the handle 12 drives the movable seat 2 with the screw sleeve 7 to move towards the center. At the same time, the movable seat 2 drives the other movable seat 2 to move synchronously through the cooperation of the rack 9 and the gear 10, thereby clamping the hub in the center. When clamping, the two movable seats 2 move synchronously in the center. Compared with the movement of only one movable seat 2, the lead screw 6 can rotate fewer times to achieve centered clamping and fixation.

[0028] Springs 11 are fitted at both ends of the guide rod 5, and the springs 11 are located between the end face of the movable seat 2 and the inner wall of the positioning fixture 1.

[0029] The movable seat 2 is elastically supported by spring 11, thereby improving the stability after clamping.

[0030] The bottom surface of the positioning fixture 1 is fixedly connected to a fixing ring 13. The fixing ring 13 has symmetrical fixing holes. The fixture is fixedly installed on the processing platform by fasteners through the fixing ring 13 and the fixing holes.

[0031] Each clamping base 4 is symmetrically fixedly connected with a clamping arm 14. The end of each clamping arm 14 is rotatably connected to a rotating shaft 15. A circular arc clamping rod 16 is fixedly connected to the rotating shaft 15. A clamping column 17 is fixedly connected to the end of the circular arc clamping rod 16. An avoidance cavity for the movement of the circular arc clamping rod 16 is provided on the clamping arm 14.

[0032] The clamping seat 4 drives the arc clamping rod 16 to clamp the wheel hub through the clamping arm 14. When clamping, the arc clamping rod 16 presses the wheel hub against the clamping column 17. The arc clamping rod 16 can be rotated through the rotating shaft 15, so as to facilitate multi-point clamping and fixing of wheel hubs of different diameters.

[0033] An arc-shaped limiting groove 19 is provided at the end of the rotating shaft 15. A stop protrusion 20 is provided on the clamping arm 14 corresponding to the arc-shaped limiting groove 19. The stop protrusion 20 is inserted into the arc-shaped limiting groove 19 and is adapted to the arc-shaped limiting groove 19. A torsion spring 18 is sleeved on the outside of the rotating shaft 15. One end of the torsion spring 18 is fixedly connected to the arc-shaped clamping rod 16, and the other end of the torsion spring 18 is fixedly connected to the clamping arm 14. A notch for installing the torsion spring 18 is provided on the arc-shaped clamping rod 16.

[0034] The rotating shaft 15 is limited in rotation angle by the stop protrusion 20 and the arc-shaped limiting groove 19, and the rotating shaft 15 is twisted by the torsion spring 18, so that the arc clamping rod 16 can be kept at an initial angle, which makes it convenient for the arc clamping rod 16 to drive the clamping column 17 to abut against the hub, avoiding the problem of the arc clamping rod 16 failing to clamp due to initial position deviation.

[0035] The working principle of this utility model is as follows:

[0036] In use, the wheel hub to be clamped is first placed on the surface of the positioning fixture 1 and positioned between the two clamping seats 4. Then, the rotating handle 12 is turned, which drives the lead screw 6 to rotate. The rotating lead screw 6 drives the corresponding moving seat 2 to move along the guide rod 5 through the lead sleeve 7. The moving moving seat 2 drives the gear 10 to rotate through the rack 9. When the gear 10 rotates, it drives the other moving seat 2 to move synchronously along the guide rod 5 through another rack 9. Thus, the moving seat 2 drives the clamping seats 4 to move synchronously towards each other. The clamping seat 4 drives the arc clamping rod 16 to clamp the wheel hub through the clamping arm 14. When the arc clamping rod 16 clamps the wheel hub, the clamping post 17 at one end of the arc clamping rod 16 first contacts the wheel hub. At this time, the clamping seat 4 continues to move, and the arc clamping rod 16 deflects, forming an adaptive effect, so that the two clamping posts 17 clamp and fix the wheel hub at the same time, thus forming a multi-point clamping and fixing effect.

[0037] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An adaptive rapid positioning fixture, comprising a positioning fixture (1) for placing a wheel hub, characterized in that: The positioning fixture (1) has two symmetrically arranged movable seats (2) inside. The top surface of the positioning fixture (1) is symmetrically provided with a groove (3) corresponding to the top surface of the movable seat (2). A clamping seat (4) is symmetrically slidably connected in the groove (3). The clamping seat (4) is fixedly connected to the movable seat (2). A guide rod (5) is symmetrically slidably connected through the movable seat (2). The guide rod (5) is fixedly connected to the positioning fixture (1). A lead screw (6) is movably connected through the middle of the movable seat (2). A slot is provided on the movable seat (2) for the lead screw (6) to pass through and avoid. A threaded sleeve (7) is fixedly installed in the avoidance slot on one of the movable seats (2). The threaded sleeve (7) is threaded on the outside of the lead screw (6) and is compatible with the lead screw (6). The lead screw (6) is rotatably connected in the positioning fixture (1) and one end of it passes through the positioning fixture (1). A linkage mechanism (8) is provided between the two sides of the movable seat (2).

2. The adaptive rapid positioning fixture according to claim 1, characterized in that: The linkage mechanism (8) includes two racks (9) arranged in an alternating manner and a gear (10) arranged between the two racks (9). The racks (9) are fixedly connected to the corresponding moving seats (2) respectively. The racks (9) are slidably connected to the inner side of the positioning fixture (1). The gear (10) is rotatably connected to the inner side of the positioning fixture (1) and simultaneously meshes with the two racks (9) for transmission.

3. The adaptive rapid positioning fixture according to claim 1, characterized in that: Both ends of the guide rod (5) are fitted with springs (11), and the springs (11) are located between the end face of the movable seat (2) and the inner wall of the positioning clamp (1).

4. The adaptive rapid positioning fixture according to claim 1, characterized in that: The end of the lead screw (6) extending out of the positioning clamp (1) is fixedly connected to a rotating handle (12).

5. The adaptive rapid positioning fixture according to claim 1, characterized in that: The bottom surface of the positioning fixture (1) is fixedly connected to a fixing ring (13), and fixing holes are symmetrically opened on the fixing ring (13).

6. The adaptive rapid positioning fixture according to claim 1, characterized in that: Each clamping seat (4) is symmetrically fixedly connected with a clamping arm (14), and the end of each clamping arm (14) is rotatably connected with a rotating shaft (15). A circular arc clamping rod (16) is fixedly connected to the rotating shaft (15), and a clamping column (17) is fixedly connected to the end of the circular arc clamping rod (16).

7. The adaptive rapid positioning fixture according to claim 6, characterized in that: The end of the rotating shaft (15) is provided with an arc-shaped limiting groove (19). The clamping arm (14) is provided with a stop protrusion (20) corresponding to the arc-shaped limiting groove (19). The stop protrusion (20) is inserted into the arc-shaped limiting groove (19) and is adapted to the arc-shaped limiting groove (19). A torsion spring (18) is sleeved on the outside of the rotating shaft (15). One end of the torsion spring (18) is fixedly connected to the arc clamping rod (16), and the other end of the torsion spring (18) is fixedly connected to the clamping arm (14). A notch for installing the torsion spring (18) is provided on the arc clamping rod (16).

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