Rotary clamp for shaft parts

Abstract

A rotary clamp for shaft parts comprises a machine body, the front end of the machine body is fixedly connected with a machine cover through a connecting screw rod, a feeding port is formed in the middle of the machine cover, a shaft sleeve is fixedly installed at the rear end of the machine body, and a plurality of clamping arm inlets and outlets are further formed in the outer edge of the machine cover. A balancing weight is further fixed to one end of the centrifugal rotating disc. The centrifugal force generated by rotation of the machine body is utilized, the balancing weight drives the centrifugal rotating disc to rotate around the mounting ring, the clamping ends of the clamping arms are driven to get close to each other in the rotating process so as to clamp a part, the part is continuously clamped in the process along with increase of the rotating speed, and only the proper rotating speed needs to be controlled; therefore, the clamping part of the part cannot be damaged while the part is clamped. And secondly, the structure is simple, in the process of reducing the rotating speed, the clamping arms are gradually moved out of the clamping arm inlets and outlets under the action of the torsion springs, and the clamping arms return to the initial positions after shutdown, so that the parts can be taken out without independently adjusting the clamping arms.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of shaft parts machining equipment, in particular to a kind of shaft parts rotary fixture. BACKGROUND

[0002] Machine tool fixture is used to fix parts and ensure that its position does not change during processing. They play a crucial role in the machinery manufacturing and metal processing industry, as they can ensure the correct positioning of parts, improve machining accuracy, ensure product consistency, and improve production efficiency. Traditional machine tool fixtures include general fixtures, special fixtures and combined fixtures, among which the general fixture is used more frequently, such as three-jaw chuck and four-jaw single-action chuck. However, the existing general fixture is prone to damage to the clamping part of the shaft part during machining, especially for important shaft parts that play a transmission role. Damage not only affects the quality of the parts, but also requires subsequent processing, which usually adopts secondary turning. Secondary turning will make the diameter smaller and affect the quality of the parts. SUMMARY

[0003] The utility model aims at solving that shaft parts are damaged by machine tool fixture during clamping process. Through the technical scheme of the application, the speed can be adjusted during clamping operation to reduce damage, and the parts can be directly taken out after stopping, without the need to adjust the clamping arm.

[0004] The utility model adopts the following technical scheme:

[0005] A kind of shaft parts rotary fixture, including machine body, the front end of the machine body is fixedly connected with machine cover by connecting screw rod, feeding port is set in the middle of the machine cover, the rear end of the machine body is fixedly installed with shaft sleeve, a plurality of clamping arm inlets and outlets are also set in the outer edge of the machine cover, installation cavity is also set in the inside of the machine body, shaft cavity is also set in the installation cavity, the center of the shaft cavity and the center axis of the machine cover are located on the same straight line, the shaft cavity is movably installed with shaft, centrifugal turntable is fixed on the upper portion of the shaft, counterweight is also fixed to one end of the centrifugal turntable, the top of the centrifugal turntable is fixedly connected with each clamping arm by connecting pin.

[0006] Through the technical scheme, the fixture is fixedly installed on the power output end of machine tool through the installation of shaft sleeve. When processing parts, the parts are inserted into the feeding port of the machine cover through the mechanical arm, so that the end of the parts extends into the inside of the centrifugal turntable. Then the machine tool is started. The centrifugal turntable rotates under the action of the counterweight during the rotation of the machine body. With the increase of rotation speed, the centrifugal turntable drives the clamping arm to move, so that the clamping arm gradually approaches and clamps the parts. After stopping rotation, the centrifugal turntable gradually returns to the initial position, so that the clamping arm also moves out from the clamping arm inlet and outlet.

[0007] Preferably, the mounting shaft sleeve is provided with a plurality of inner threaded holes in a circumferential array, which are matched with the fastening screw.

[0008] By the technical scheme, the fastening screw can fix the clamp on the machine tool output shaft, and the clamp can be conveniently disassembled and replaced.

[0009] Preferably, an installation ring is further fixedly arranged in the installation cavity, the central axis of the installation ring coincides with the central axis of the rotating shaft cavity, and the installation ring is matched with the centrifugal turntable.

[0010] By the technical scheme, the centrifugal turntable rotates in the installation ring, and the installation ring mainly plays a guiding and positioning role, and can prevent the centrifugal turntable from being separated in the process of being driven to rotate by the counterweight.

[0011] Preferably, a groove is further arranged in the installation ring, and a convex edge is further arranged at the edge of the centrifugal turntable, and the convex edge extends into the groove.

[0012] By the technical scheme, the centrifugal turntable will not shake up and down in the process of rotation, so that the centrifugal turntable rotates more stably under the action of the counterweight.

[0013] Preferably, a torsional spring is further sleeved on the rotating shaft, the top end of the torsional spring is fixedly connected with the centrifugal turntable, and the bottom end of the torsional spring is further fixedly connected with the bottom surface of the rotating shaft cavity.

[0014] By the technical scheme, in the process of rotation of the centrifugal turntable, the torsional spring torque increases, the faster the rotating speed is, the greater the torsional spring deformation is, so that the clamping of the clamping arm is also tighter, and when the rotating speed is reduced or the machine is stopped, the torsional spring torque is greater than the centrifugal force, so that the torsional spring continuously resets until the initial position is reached.

[0015] Preferably, a plurality of positioning rods are further fixedly arranged at the front end of the machine body, and a straight slot is further arranged on the clamping arm, and each positioning rod partially extends into the straight slot of the corresponding clamping arm.

[0016] By the technical scheme, in the process of movement of the clamping arm, the positioning rod plays a positioning role, that is, the straight slot moves left and right along the positioning rod.

[0017] A limiting circular hole is further arranged on the centrifugal turntable, the limiting circular hole coincides with the axis of the feeding port, and the diameters are the same.

[0018] By the technical scheme, the end of the part extending into the clamp reaches the limiting circular hole, so that in the process of turning, the machined end face of the part is stressed, and if the part cannot extend into the limiting circular hole or there is no limiting circular hole, the part will be unstable under stress and will easily shake, thereby causing damage to the clamping surface.

[0019] The beneficial effects of the utility model lie in:

[0020] 1. The utility model discloses a centrifugal force produced by the rotation of the body, so that the counterweight drives the centrifugal turntable to rotate around the mounting ring, the clamping end of the clamping arm is approached to each other in the process of rotation, so that the part is clamped, and the process is clamped constantly with the increase of the rotating speed, and only the proper rotating speed needs to be controlled, so that the part can not be damaged in the clamping.

[0021] 2. The utility model discloses simple structure, and in the process of reducing the rotating speed, the clamping arm is removed from the clamping arm inlet and outlet gradually under the action of torsion spring until after shutdown, and the clamping arm returns to the initial position, so that the part can be taken out without adjusting the clamping arm separately. DRAWINGS

[0022] Figure 1 It is a three-dimensional structure diagram of a shaft part rotary clamp;

[0023] Figure 2 It is an internal three-dimensional structure diagram of a shaft part rotary clamp;

[0024] Figure 3 It is a sectional structure diagram of a shaft part rotary clamp;

[0025] Figure 4 It is an internal end face structure diagram of a cover;

[0026] Figure 5 It is a working principle schematic diagram of the utility model;

[0027] Figure 6 It is an initial working schematic diagram of a clamping arm;

[0028] Figure 7 It is a clamping working schematic diagram of a clamping arm;

[0029] In the drawing: body 1, connecting screw rod 2, cover 3, feed inlet 4, mounting shaft sleeve 5, clamping arm inlet and outlet 6, mounting cavity 7, rotating shaft cavity 8, rotating shaft 9, centrifugal turntable 10, clamping arm 11, connecting pin 12, fastening screw rod 13, mounting ring 14, recess 15, convex edge 16, torsion spring 17, positioning rod 18, straight slot 19, limiting round hole 20 and counterweight 21. DETAILED DESCRIPTION

[0030] The technical scheme in the embodiments of the utility model will be apparently and completely described in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0031] Embodiment 1:

[0032] Reference Figures 1-7The utility model provides a kind of shaft parts rotary clamp, including machine body 1, the front end of the machine body 1 is fixedly connected cover 3 by connecting screw rod 2, the middle of the cover 3 is opened feed inlet 4, the rear end of the machine body 1 is fixedly installed shaft sleeve 5, the outer edge of the cover 3 is also opened several clamping arm inlet and outlet 6, the inside of the machine body 1 is also opened installation cavity 7, the inside of the installation cavity 7 is also opened shaft cavity 8, the center axis of the shaft cavity 8 is located on the same straight line with the center axis of cover 3, the shaft cavity 8 is movably installed shaft 9, the upper portion of the shaft 9 is fixed centrifugal turntable 10, one end of the centrifugal turntable 10 is also fixed counterweight 21, the top of the centrifugal turntable 10 is fixedly connected with each clamping arm 11 by connecting pin 12.Starting, directly by installation shaft sleeve 5, the clamp is installed on the output shaft of machine tool, then mechanical arm is directly sent into the clamp from feed inlet 4 with part, then start machine tool, in the process of machine tool whole rotation, centrifugal force will be generated, so that counterweight 21 drives centrifugal turntable 10 to rotate around installation ring 14, so that connecting pin 12 fixedly connected on centrifugal turntable 10 will drive clamping arm 11 to move, so that clamping arm 11 will be close to part, the process can hold part, the rotating speed cannot exceed the specified rotating speed, once exceeding the specified rotating speed, will damage part, after turning, the rotating speed is gradually reduced until stopping, clamping arm 11 will return to initial position, so that part can be directly taken out, the process does not need to adjust the position of clamping arm 11 separately.

[0033] The installation shaft sleeve 5 is circumferentially arranged with a plurality of internally threaded holes, which are matched with fastening screw rods 13. When installing the clamp, the installation shaft sleeve 5 is sleeved on the output shaft, and then is fixed by the fastening screw rods 13.

[0034] The installation cavity 7 is also fixedly provided with an installation ring 14, the center axis of the installation ring 14 coincides with the center axis of the shaft cavity 8, and the centrifugal turntable 10 is fitted in the installation ring 14, rotates around the installation ring 14 in the process of rotation, the installation ring 14 rotates synchronously with the machine body 1, and the counterweight 21 causes the centrifugal turntable 10 and the installation ring 14 to have a rotating speed difference, so that the clamping arm 11 moves.

[0035] The installation ring 14 is also provided with a groove 15, and the edge of the centrifugal turntable 10 is also provided with a convex edge 16, the convex edge 16 extends into the groove 15, so as to mainly avoid the centrifugal turntable 10 from moving up and down in the installation ring 14.

[0036] The rotating shaft 9 is also sleeved with a torsion spring 17, the top end of the torsion spring 17 is fixedly connected with the centrifugal turntable 10, and the bottom end of the torsion spring 17 is also fixedly connected with the bottom surface of the rotating shaft cavity 8. The centrifugal turntable 10 rotates to continuously twist the torsion spring 17, so that the torsion moment of the torsion spring 17 is increased, the centrifugal force is greater than the initial torsion moment of the torsion moment in the process, and when the rotating speed is reduced, the torsion moment of the torsion spring 17 is gradually greater than the centrifugal force. Thus, the torsion spring 17 is reset, the centrifugal turntable 10 is reversely rotated, and thus the clamping arm 11 is gradually separated from the part.

[0037] The machine body 1 is also fixedly provided with a plurality of positioning rods 18 at the front end, and the clamping arm 11 is also provided with a straight slot 19, and each positioning rod 18 partially extends into the straight slot 19 of the corresponding clamping arm 11.

[0038] The centrifugal turntable 10 is also provided with a limiting circular hole 20, the limiting circular hole 20 is coaxial with the axis of the feeding port 4 and has the same diameter, and the end of the part extending into the clamp reaches the limiting circular hole 20. Thus, in the process of turning, the part processing end face is stressed, if the part cannot extend into the limiting circular hole 20 or there is no limiting circular hole 20, the part is unstable under stress and is easy to shake, so that the clamping surface is damaged.

[0039] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A rotary clamp for a shaft-like part, characterized in that: Including the body (1), the front end of the body (1) is fixedly connected to the cover (3) through the connecting screw rod (2), the middle of the cover (3) is provided with the feeding port (4), the rear end of the body (1) is fixedly installed with the shaft sleeve (5), the outer edge of the cover (3) is also provided with a plurality of clamping arm inlets and outlets (6), the inside of the body (1) is also provided with the installation cavity (7), the inside of the installation cavity (7) is also provided with the rotating shaft cavity (8), the central axis of the rotating shaft cavity (8) is located on the same straight line as the central axis of the cover (3), the rotating shaft (9) is movably installed in the rotating shaft cavity (8), the upper part of the rotating shaft (9) is fixedly provided with the centrifugal turntable (10), one end of the centrifugal turntable (10) is also fixedly provided with the counterweight (21), the top of the centrifugal turntable (10) is fixedly connected with each clamping arm (11) through the connecting pin (12).

2. The rotary clamp for a shaft part according to claim 1, characterized in that: A plurality of inner threaded holes are circumferentially arranged on the installation shaft sleeve (5), and the inner threaded holes are matched with the fastening screw rod (13).

3. The rotary clamp for a shaft part according to claim 1, characterized in that: The installation cavity (7) is also fixedly provided with the installation ring (14), the central axis of the installation ring (14) coincides with the central axis of the rotating shaft cavity (8), and the installation ring (14) is matched with the centrifugal turntable (10).

4. The rotary clamp for a shaft part according to claim 3, characterized in that: The installation ring (14) is also provided with the groove (15), and the edge of the centrifugal turntable (10) is also provided with the convex edge (16), the convex edge (16) extends into the groove (15).

5. The rotary clamp for a shaft part according to claim 1, characterized in that: The rotating shaft (9) is also sleeved with the torsional spring (17), the top end of the torsional spring (17) is fixedly connected with the centrifugal turntable (10), and the bottom end of the torsional spring (17) is also fixedly connected with the bottom surface of the rotating shaft cavity (8).

6. The rotary clamp for a shaft part according to claim 1, characterized in that: The front end of the body (1) is also fixedly provided with a plurality of positioning rods (18), the clamping arm (11) is also provided with the straight slot (19), and each positioning rod (18) partially extends into the straight slot (19) of the corresponding clamping arm (11).

7. The rotary clamp for a shaft part according to claim 1, characterized in that: The centrifugal turntable (10) is also provided with the limiting circular hole (20), the limiting circular hole (20) coincides with the axis of the feeding port (4), and the diameters are the same.

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