Centering tensioning clamp

Abstract

A centering tensioning clamp relates to the technical field of clamp equipment and comprises a clamp bottom plate, and a support is fixedly arranged on the clamp bottom plate. A clamp body of a hollow structure is fixedly arranged on one side of the support. A pull rod is arranged in an inner cavity of the clamp body in the axial direction, and one end of the pull rod penetrates through the support to be connected with the driving end of the tensioning driving mechanism. A limiting part is arranged in an inner cavity of the clamp body and divides the inner cavity of the clamp body into a left mounting cavity and a right mounting cavity which are communicated with each other; and tensioning clamping mechanisms are arranged in the left mounting cavity and the right mounting cavity correspondingly, and clamping parts of the tensioning clamping mechanisms penetrate through the side wall of the clamp body. According to the tensioning device, a workpiece with a long hole structure can be tensioned, clamped and fixed, the structure is simple, and operation is easy; and the clamping device can be suitable for clamping workpieces with various hole diameters and is wide in application range.

Description

Technical Field

[0001] The utility model relates to the technical field of fixture equipment, in particular to a centering and tensioning fixture. Background Art

[0002] The existing centering fixtures are widely used in the processing of workpieces with shaft holes. It is required that the fixture has a good centering effect and can clamp well at the same time. The existing centering clamping technology is to clamp the inner hole of the workpiece with a three-jaw chuck or cover one end of the inner hole of the workpiece with a blind cover and then use a center to hold the blind cover to achieve centering; however, for workpieces with long-hole structures, the above centering methods are not applicable. The existing technology is to set two hydraulic cylinders in the long hole of the workpiece. The two hydraulic cylinders push the wedge blocks to drive the supporting blocks to expand and tighten the inner hole to center and clamp the workpiece. The structure is complex and the operation is cumbersome; moreover, the hydraulic cylinders are arranged in the long hole, and it is difficult to maintain after damage. If oil leakage occurs, it will also contaminate the inner hole of the workpiece and needs to be wiped, reducing the production efficiency. Summary of the Utility Model

[0003] In view of this, the technical problem to be solved by the utility model is: to provide a centering and tensioning fixture that can expand, clamp and fix workpieces with long-hole structures, has a simple structure and is easy to operate; and can adapt to clamping workpieces with multiple apertures, with a wide range of applications.

[0004] To solve the above technical problem, the technical solution of the utility model is:

[0005] A centering and tensioning fixture includes a fixture base plate, and a vertically arranged bracket is fixedly provided on the fixture base plate; a fixture body with a hollow structure is fixedly provided on one side of the bracket, and the fixture body is used to extend into the inner hole of the workpiece;

[0006] A pull rod is arranged along the axial direction in the inner cavity of the fixture body, and one end of the pull rod penetrates through the bracket and is connected to the driving end of a tensioning driving mechanism;

[0007] An annular limiting part is arranged in the inner cavity of the fixture body, and the inner cavity of the fixture body is divided by the limiting part to form a communicating left installation cavity and right installation cavity, and the pull rod penetrates through the left installation cavity and the right installation cavity;

[0008] Tensioning and clamping mechanisms controlled by the pull rod are arranged in both the left installation cavity and the right installation cavity, and the clamping parts of the tensioning and clamping mechanisms penetrate through the side wall of the fixture body;

[0009] When the pull rod reciprocates along the axial direction of the fixture body, the clamping parts of the two tensioning and clamping mechanisms simultaneously extend outward or contract inward along the radial direction of the fixture body to clamp or release the workpiece.

[0010] Preferably, the two tension clamping mechanisms are mirror-symmetrical along the limiting portion, and each tension clamping mechanism includes a main spring, a wedge block, a plurality of tension components, and a plurality of reset components;

[0011] The wedge block is of a hollow structure, and both the wedge block and the main spring are sleeved on the pull rod. The main spring abuts between the wedge block and the limiting portion;

[0012] The tension components penetrate through the side wall of the fixture body in the radial direction of the fixture body. A guiding inclined surface is provided on the tension components, and an inclined groove adapted to the guiding inclined surface is provided on the wedge block. The inclined groove is used to push the clamping portion of the tension components to extend outwards;

[0013] The reset components are installed on the side wall of the fixture body and are adapted to the tension components. The reset components are used to drive the clamping portions of the tension components to contract inwards.

[0014] Preferably, the tension components include a support block guide sleeve and a support block;

[0015] The support block guide sleeve is of a hollow structure and is installed through the side wall of the fixture body in the radial direction of the fixture body;

[0016] The support block is slidably arranged in the inner cavity of the support block guide sleeve. One end of the support block is provided with the guiding inclined surface and extends into the inclined groove. A feeding through hole adapted to the reset components is formed in the support block.

[0017] Preferably, the reset components include a locking screw, a dial block, and a secondary spring;

[0018] A screw receiving cavity for accommodating the locking screw is provided on the side wall of the fixture body. The screw receiving cavity is arranged outside the support block guide sleeve, and the locking screw is installed in the screw receiving cavity;

[0019] One end of the dial block is located in the screw receiving cavity and is sleeved on the locking screw. An avoidance opening for avoiding the dial block is formed on the support block guide sleeve. The other end of the dial block passes through the avoidance opening and extends into the interior of the feeding through hole;

[0020] The secondary spring is sleeved on the locking screw and abuts between the locking screw and the dial block.

[0021] Preferably, a stop surface adapted to the locking screw is formed on the support block guide sleeve, and the head of the locking screw is pressed against the stop surface.

[0022] Preferably, a hollow pressure sleeve is arranged in the left installation cavity;

[0023] The pressure sleeve is sleeved on the pull rod. One end of the pressure sleeve abuts against the wedge block, and the other end extends out of the left installation cavity and is located outside the fixture body.

[0024] Preferably, the tensioning drive mechanism includes a tensioning drive member and a pushing assembly;

[0025] The driving end of the tensioning drive member is connected to the pull rod;

[0026] The pushing assembly is sleeved on the pull rod and is located between the tensioning drive member and the pressure sleeve. One side of the pushing assembly is fixedly connected to the outer shell of the tensioning drive member, and the other side abuts against the pressure sleeve.

[0027] Preferably, the pushing assembly includes a push plate, a plurality of support guide sleeves, and a plurality of fastening bolts;

[0028] One side of the push plate is fixedly connected to the outer shell of the tensioning drive member, and the other side abuts against the pressure sleeve;

[0029] The fastening bolts pass through the support guide sleeves and are fixedly connected to the bracket;

[0030] The support guide sleeves are slidably arranged between the fastening bolts and the push plate.

[0031] Preferably, a clamping drive member is installed on the fixture bottom plate, and the outer shell of the clamping drive member is hinged to the clamping claw;

[0032] The bottom end of the clamping claw is connected to the driving end of the clamping drive member. The top end of the clamping claw is arranged along the axis of the fixture body on its outside. An abutting portion adapted to the clamping claw is provided on the outer shell of the fixture body. The clamping claw is used to abut the workpiece against the abutting portion to clamp the workpiece axially along the fixture body.

[0033] Preferably, a vertically arranged limit post is fixedly provided on the fixture bottom plate. The limit post is located outside the fixture body and is used to support the workpiece and limit its rotation around the axis of the fixture body.

[0034] After adopting the above technical solution, the beneficial effects of the present utility model are:

[0035] Since in the present utility model, it includes a fixture bottom plate, and a vertically arranged bracket is fixedly provided on the fixture bottom plate; a hollow-structured fixture body is fixedly provided on one side of the bracket, and the fixture body is used to extend into the inner hole of the workpiece; when tensioning and clamping the workpiece, the fixture body extends into the inner hole of the workpiece, playing a role of centering and supporting the workpiece.

[0036] A pull rod is arranged along the axial direction in the inner cavity of the fixture body, and one end of the pull rod penetrates through the bracket and is connected to the driving end of the tension driving mechanism; a limiting part with an annular structure is arranged in the inner cavity of the fixture body, and the limiting part divides the inner cavity of the fixture body into a communicated left installation cavity and a right installation cavity, and the pull rod penetrates through the left installation cavity and the right installation cavity; tension clamping mechanisms controlled by the pull rod are arranged in both the left installation cavity and the right installation cavity, and the clamping parts of the tension clamping mechanisms penetrate through the side wall of the fixture body; when the pull rod reciprocates along the axial direction of the fixture body, the clamping parts of the two tension clamping mechanisms simultaneously extend outwards or contract inwards along the radial direction of the fixture body to clamp or release the workpiece. When in use, when it is necessary to perform centering tension clamping on the workpiece, the fixture body is inserted into the inner hole of the workpiece, and then the tension driving mechanism drives the pull rod to contract, and the pull rod drives the clamping parts of the two tension clamping mechanisms to simultaneously extend outwards along the radial direction of the fixture body, so as to realize tensioning of the inner hole of the workpiece and clamp the workpiece to complete the fixing work.

[0037] In this application, only one tension driving mechanism is set to drive the pull rod, and the two tension clamping mechanisms can be controlled to act simultaneously to clamp or release the workpiece, changing the original method of separately controlling by two hydraulic cylinders, reducing the production cost and the control difficulty; moreover, the tension driving mechanism is located outside the bracket. When tension clamping the workpiece, only the fixture body needs to be inserted into the inner hole of the workpiece, and there is no need to insert the tension driving mechanism into the inner hole together, which is convenient for maintenance and improves the stability of use and the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0039] Figure 1 is a schematic structural diagram of the centering tension fixture according to the embodiment of the present utility model;

[0040] Figure 2 is Figure 1 an exploded view of;

[0041] Figure 3 is Figure 2 an exploded view of the wedge block, the tension assembly and the reset assembly in;

[0042] Figure 4 is Figure 1 a schematic structural diagram of the centering tension fixture when clamping the workpiece in;

[0043] Figure 5 is Figure 4 a partial cross-sectional view in a top view state;

[0044] Figure 6 is Figure 5 the A-A cross-sectional view of;

[0045] Figure 7 is Figure 5 the sectional view taken along line B-B;

[0046] Figure 8 is Figure 6 the enlarged view of part C of

[0047] In the figure:

[0048] 1. Fixture base plate; 11. Bracket; 12. Limit post;

[0049] 2. Fixture body; 21. Limiting part; 22. Left mounting cavity; 23. Right mounting cavity; 24. Screw receiving cavity; 25. Bush; 26. Contact part;

[0050] 3. Workpiece; 31. Inner hole; 32. Machined surface;

[0051] 4. Pull rod;

[0052] 5. Tension driving mechanism; 51. Tension driving part; 52. Pushing component; 521. Push plate; 522. Support guide sleeve; 523. Fastening bolt;

[0053] 6. Tension clamping mechanism; 61. Main spring; 62. Wedge block; 621. Inclined groove; 63. Tension component; 631. Guide inclined plane; 632. Support block guide sleeve; 6321. Avoidance opening; 6322. Stop surface; 633. Support block; 6331. Feeding through hole; 64. Reset component; 641. Locking screw; 642. Pushing block; 643. Auxiliary spring;

[0054] 7. Clamping driving part; 71. Clamping jaw. Detailed implementation mode

[0055] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0056] As Figures 1 to 8 collectively shown, the present utility model includes a fixture base plate 1, on which a vertically arranged bracket 11 is fixedly provided; on one side of the bracket 11, a fixture body 2 with a hollow structure is fixedly provided, and the fixture body 2 is used to extend into the inner hole 31 of the workpiece 3; when the workpiece 3 is tensioned and clamped, the fixture body 2 extends into the inner hole 31 of the workpiece 3 to play a role of centering and supporting the workpiece 3.

[0057] A pull rod 4 is arranged axially in the inner cavity of the fixture body 2, and one end of the pull rod 4 penetrates through the bracket 11 and is connected to the driving end of the tension driving mechanism 5; it should be noted that in this application, the tension driving mechanism 5 is not connected to the bracket 11, and only the driving end of the tension driving mechanism 5 needs to be connected to the pull rod 4.

[0058] A limiting part 21 with an annular structure is arranged in the inner cavity of the fixture body 2. The limiting part 21 divides the inner cavity of the fixture body 2 into a connected left installation cavity 22 and a right installation cavity 23, and the pull rod 4 penetrates through the left installation cavity 22 and the right installation cavity 23; tension clamping mechanisms 6 controlled by the pull rod 4 are arranged in both the left installation cavity 22 and the right installation cavity 23, and the clamping parts of the tension clamping mechanisms 6 penetrate through the side wall of the fixture body 2; when the pull rod 4 reciprocates axially along the fixture body 2, the clamping parts of the two tension clamping mechanisms 6 simultaneously extend outward or contract inward along the radial direction of the fixture body 2 to clamp or release the workpiece 3.

[0059] During use, when it is necessary to perform centering tension clamping on the workpiece 3, the fixture body 2 is inserted into the inner hole 31 of the workpiece 3, and then the tension driving mechanism 5 drives the pull rod 4 to contract. The pull rod 4 drives the clamping parts of the two tension clamping mechanisms 6 to simultaneously extend outward along the radial direction of the fixture body 2, so as to tighten the inner hole 31 of the workpiece 3 and clamp the workpiece 3 to complete the fixing work.

[0060] In this application, only one tension driving mechanism 5 is set to drive the pull rod 4, and the two tension clamping mechanisms 6 can be controlled to act simultaneously to clamp or release the workpiece 3, changing the original method of separately controlling by two hydraulic cylinders, reducing the production cost and the control difficulty; moreover, the tension driving mechanism 5 is located outside the bracket 11. When tension clamping the workpiece 3, only the fixture body 2 needs to be inserted into the inner hole 31 of the workpiece 3, and there is no need to insert the tension driving mechanism 5 into the inner hole 31 together, which is convenient for maintenance and improves the stability of use and the production efficiency.

[0061] In this application, the two tension clamping mechanisms 6 are mirror-symmetrical along the limiting part 21. The tension clamping mechanism 6 includes a main spring 61, a wedge block 62, a plurality of tension components 63, and a plurality of reset components 64. Among them, the wedge block 62 is a hollow structure, and both the wedge block 62 and the main spring 61 are sleeved on the pull rod 4. The main spring 61 abuts between the wedge block 62 and the limiting part 21; a wedge block blocking part is arranged on the pull rod in the right installation cavity 23, and the wedge block blocking part is arranged outside the wedge block 62 to block the wedge block 62 in the right installation cavity 23 and abut it with the main spring 61 between the wedge block blocking part and the limiting part 21 to prevent the main spring 61 and the wedge block 62 from slipping off the pull rod 4. A plug cover is installed on the fixture body 2, and the plug cover is arranged outside the wedge block blocking part to seal and dust-proof the inner cavity of the fixture body 2.

[0062] The tensioning assembly 63 penetrates the side wall of the fixture body 2 along the radial direction thereof. A guiding inclined surface 631 is provided on the tensioning assembly 63, and an inclined groove 621 adapted to the guiding inclined surface 631 is provided on the wedge block 62. The inclined groove 621 is used to push the clamping part of the tensioning assembly 63 to extend outwards. When the pull rod 4 drives the wedge block 62 to reciprocate along the radial direction of the fixture body 2, it should be noted that since the two wedge blocks 62 located in the left installation cavity 22 and the right installation cavity 23 are arranged in mirror symmetry, the inclined grooves 621 of the two are also in mirror symmetry, and the moving directions of the two wedge blocks 62 are opposite. They can cooperate through their respective inclined grooves 621 and guiding inclined surfaces 631 to jointly push the clamping parts of the tensioning assembly 63 to extend outwards together.

[0063] The reset assembly 64 is installed on the side wall of the fixture body 2 and is adapted to the tensioning assembly 63. The reset assembly 64 is used to drive the clamping part of the tensioning assembly 63 to contract inwards. In this application, when the clamping part of the tensioning assembly 63 needs to contract inwards along the radial direction of the fixture body 2, a separately provided reset assembly 64 is used to reset it. Among them, the number and positions of the reset assembly 64, the tensioning assembly 63, and the inclined groove 621 correspond one by one.

[0064] In this application, the tensioning assembly 63 includes a support block guide sleeve 632 and a support block 633. Among them, the support block guide sleeve 632 is of a hollow structure and is installed through the side wall of the fixture body 2 along the radial direction thereof; the support block 633 is slidably arranged in the inner cavity of the support block guide sleeve 632. One end of the support block 633 is provided with a guiding inclined surface 631 and extends into the inclined groove 621, and a feeding through hole 6331 adapted to the reset assembly 64 is formed on the support block 633.

[0065] The reset assembly 64 includes a locking screw 641, a shifting block 642, and a secondary spring 643. Among them, a screw accommodating cavity 24 for accommodating the locking screw 641 is provided on the side wall of the fixture body 2. The screw accommodating cavity 24 is arranged outside the support block guide sleeve 632, and the locking screw 641 is installed in the screw accommodating cavity 24; one end of the shifting block 642 is located in the screw accommodating cavity 24 and sleeved on the locking screw 641. An avoidance opening 6321 for avoiding the shifting block 642 is formed on the support block guide sleeve 632. The other end of the shifting block 642 passes through the avoidance opening 6321 and extends into the interior of the feeding through hole 6331; the secondary spring 643 is sleeved on the locking screw 641 and abuts between the locking screw 641 and the shifting block 642.

[0066] In this application, one end of the shifting block 642 is sleeved on the locking screw 641, and the other end of the shifting block 642 extends into the inside of the feeding through hole 6331. When the inclined slot 621 cooperates with the guiding inclined surface 631 and pushes the supporting block 633 to extend outwards, the shifting block 642 is driven to move together, and the shifting block 642 compresses the auxiliary spring 643; after the clamping and fixing are completed, the inclined slot 621 no longer pushes the guiding inclined surface 631, the auxiliary spring 643 releases the elastic force, and pushes the shifting block 642 to move in the reverse direction. The shifting block 642 drives the supporting block 633 to move in the reverse direction together through the feeding through hole 6331, realizing the contraction of the supporting block 633.

[0067] In this application, a stop surface 6322 adapted to the locking screw 641 is provided on the supporting block guide sleeve 632, and the head of the locking screw 641 is pressed against the stop surface 6322; the locking screw 641 is fixed to the supporting block guide sleeve 632 by cooperating with the stop surface 6322.

[0068] In this application, the main spring 61 and the wedge block 62 located in the right mounting cavity 23 are arranged between the wedge block resisting portion and the limiting portion 21 by providing a wedge block resisting portion on the pull rod 4. A hollow pressing sleeve 25 is provided in the left mounting cavity 22; the pressing sleeve 25 is sleeved on the pull rod 4, one end of the pressing sleeve 25 abuts against the wedge block 62, and the other end extends out of the left mounting cavity 22 and is located outside the fixture body 2.

[0069] The limiting method for the wedge block 62 in the left mounting cavity 22 is different from that of the wedge block 62 in the right mounting cavity 23. In the right mounting cavity 23, a wedge block resisting portion is provided on the pull rod 4 to block and limit the internal wedge block; while in the left mounting cavity 22, a pressing sleeve 25 is sleeved on the pull rod 4, and the internal wedge block is blocked and limited by the pressing sleeve 25.

[0070] The limiting methods on the left and right sides are different because the driving methods of the wedge block 62 in the left mounting cavity 22 are different. Since the tensioning driving mechanism 5 is not connected to the bracket 11, for the wedge block 62 in the left mounting cavity 22, the tensioning driving mechanism 5 needs to cooperate with the pressing sleeve 25 to drive it. Specifically, the tensioning driving mechanism 5 includes a tensioning driving member 51 and a pushing assembly 52; the driving end of the tensioning driving member 51 is connected to the pull rod 4; the pushing assembly 52 is sleeved on the pull rod 4 and is located between the tensioning driving member 51 and the pressing sleeve 25. One side of the pushing assembly 52 is fixedly connected to the housing of the tensioning driving member 51, and the other side abuts against the pressing sleeve 25. When the driving end of the tensioning driving member 51 drives the pull rod 4 to move leftwards, the housing of the tensioning driving member 51 moves rightwards relatively. The housing of the tensioning driving member 51 drives the pushing assembly 52 to push the pressing sleeve 25 to move rightwards together. The pressing sleeve 25 pushes the wedge block 62 to compress the main spring 61, and at the same time, the inclined slot 621 on the wedge block 62 pushes the supporting block 633 to extend outwards.

[0071] Specifically, the pushing component 52 includes a push plate 521, a plurality of support guide sleeves 522, and a plurality of fastening bolts 523; one side of the push plate 521 is fixedly connected to the housing of the tensioning driving member 51, and the other side thereof abuts against the pressure sleeve 25; the fastening bolts 523 pass through the support guide sleeves 522 and are fixedly connected to the bracket 11; the support guide sleeves 522 are slidably disposed between the fastening bolts 523 and the push plate 521. The positions and numbers of the fastening bolts 523 and the support guide sleeves 522 correspond one by one. During the movement of the push plate 521, the sliding fit is between the push plate 521 and the support guide sleeves 522, and between the support guide sleeves 522 and the fastening bolts 523.

[0072] In the present application, a clamping driving member 7 is installed on the fixture base plate 1, and the housing of the clamping driving member 7 is hinged to the clamping jaw 71; the bottom end of the clamping jaw 71 is connected to the driving end of the clamping driving member 7, and the top end of the clamping jaw 71 is disposed on the outside along the axis of the fixture body 2. An abutting portion 26 adapted to the clamping jaw 71 is provided on the housing of the fixture body 2, and the clamping jaw 71 is used to abut the workpiece 3 against the abutting portion 26 to clamp it axially along the fixture body 2. Preferably, both the clamping driving member 7 and the tensioning driving member 51 are hydraulic cylinders. When clamping the workpiece 3, the workpiece 3 is sleeved on the outside of the fixture body 2 through its inner hole 31. Then, the clamping driving member 7 drives the clamping jaw 71 to turn up, and cooperates with the abutting portion 26 to clamp the workpiece 3 between the two, realizing axial fixation.

[0073] In the present application, a vertically arranged limit post 12 is fixedly provided on the fixture base plate 1. The limit post 12 is located outside the fixture body 2, and the limit post 12 is used to support the workpiece 3 and limit its rotation around the axis of the fixture body 2. After the workpiece 3 is clamped to the fixture body 2, the processing surface 32 of the workpiece 3 needs to be processed. During the processing, by providing the limit post 12 to support and limit the workpiece 3, its self-rotation can be prevented, enhancing the stability of the processing.

[0074] When this application is in use, align the inner hole 31 of the workpiece 3 with the fixture body 2. Place the workpiece 3 on the fixture body 2. The clamping driving member 7 drives the clamping claw 71, and the clamping claw 71 clamps the workpiece 3 on the abutting portion 26 for axial fixation. Then, the tensioning driving member 51 drives the pull rod 4 to move leftward. During the movement of the pull rod 4, the housing of the tensioning driving member 51 moves relatively rightward. The push plate 521 is used to push the pressure sleeve 25 to move rightward, and the wedge block 62 located in the left mounting cavity 22 is pushed to compress the main spring 61. The inclined groove 621 cooperates with the corresponding guiding inclined surface 631 to push the support block 633 located in the left mounting cavity 22 to move outward to tension the workpiece 3. During this process, the pull rod 4 moves leftward, and the pull rod 4 drives the wedge block 62 located in the right mounting cavity 23 to move leftward together. Therefore, the wedge block 62 in the right mounting cavity 23 also compresses the main spring 61. The inclined groove 621 on this wedge block 62 cooperates with the corresponding guiding inclined surface 631 to push the support block 633 located in the right mounting cavity 23 to move outward to tension the workpiece 3 simultaneously. After the processing is completed, the tensioning driving member 51 drives the pull rod 4 to move in the reverse direction. The support block 633 moves inward under the drive of the corresponding dial block 642 and the auxiliary spring 643 to complete the release of the workpiece 3. Then, the clamping driving member 7 releases the clamping claw 71, and the workpiece 3 can be removed from the fixture body 2.

[0075] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A centering and tensioning fixture, comprising a fixture base plate, and a vertically arranged bracket fixedly provided on the fixture base plate; characterized in that, One side of the bracket is fixedly provided with a clamp body having a hollow structure, and the clamp body is used to extend into the inner hole of the workpiece; A pull rod is arranged along the axial direction in the inner cavity of the clamp body, and one end of the pull rod penetrates through the bracket and is connected with the driving end of the tension driving mechanism; An annular limiting part is arranged in the inner cavity of the clamp body, and the limiting part divides the inner cavity of the clamp body into a communicated left installation cavity and a right installation cavity, and the pull rod penetrates through the left installation cavity and the right installation cavity; Tension clamping mechanisms controlled by the pull rod are arranged in both the left installation cavity and the right installation cavity, and the clamping parts of the tension clamping mechanisms penetrate through the side wall of the clamp body; When the pull rod reciprocates along the axial direction of the clamp body, the clamping parts of the two tension clamping mechanisms simultaneously extend outwards or contract inwards along the radial direction of the clamp body to clamp or release the workpiece.

2. The centering and tensioning fixture according to claim 1, wherein The two tension clamping mechanisms are mirror-symmetrical along the limiting part, and the tension clamping mechanism includes a main spring, a wedge block, a plurality of tension components, and a plurality of reset components; The wedge block has a hollow structure, and both the wedge block and the main spring are sleeved on the pull rod, and the main spring abuts between the wedge block and the limiting part; The tension component penetrates through the side wall of the clamp body along the radial direction of the clamp body, a guiding inclined surface is arranged on the tension component, and an inclined groove adapted to the guiding inclined surface is arranged on the wedge block, and the inclined groove is used to push the clamping part of the tension component to extend outwards; The reset component is installed on the side wall of the clamp body and is adapted to the tension component, and the reset component is used to drive the clamping part of the tension component to contract inwards.

3. The centering and tensioning fixture according to claim 2, characterized in that, The tension component includes a support block guide sleeve and a support block; The support block guide sleeve has a hollow structure and is installed through the side wall of the clamp body along the radial direction of the clamp body; The support block is slidably arranged in the inner cavity of the support block guide sleeve, one end of the support block is provided with the guiding inclined surface and extends into the inclined groove, and a feeding through hole adapted to the reset component is arranged on the support block.

4. The centering and tensioning fixture according to claim 3, characterized in that, The reset component includes a locking screw, a dial block, and a secondary spring; A screw accommodation cavity for accommodating the locking screw is arranged on the side wall of the clamp body, the screw accommodation cavity is arranged outside the support block guide sleeve, and the locking screw is installed in the screw accommodation cavity; One end of the dial block is located in the screw accommodation cavity and is sleeved on the locking screw, an avoidance opening for avoiding the dial block is arranged on the support block guide sleeve, and the other end of the dial block passes through the avoidance opening and extends into the interior of the feeding through hole; The secondary spring is sleeved on the locking screw and abuts between the locking screw and the dial block.

5. The centering and tightening fixture according to claim 4, wherein A stop surface adapted to the locking screw is arranged on the support block guide sleeve, and the head of the locking screw is pressed against the stop surface.

6. The centering and tensioning fixture according to claim 2, characterized in that, A hollow structure pressing sleeve is arranged in the left installation cavity; The pressing sleeve is sleeved on the pull rod, one end of the pressing sleeve abuts against the wedge block, and the other end extends out of the left installation cavity and is located outside the clamp body.

7. The centering and tensioning fixture according to claim 6, wherein, The tension driving mechanism includes a tension driving part and a pushing component; The driving end of the tension driving part is connected with the pull rod; The pushing component is sleeved on the pull rod and located between the tensioning driving part and the pressing sleeve. One side of the pushing component is fixedly connected to the outer shell of the tensioning driving part, and the other side thereof abuts against the pressing sleeve.

8. The centering and tensioning fixture according to claim 7, characterized in that, The pushing component includes a push plate, a plurality of support guide sleeves, and a plurality of fastening bolts; One side of the push plate is fixedly connected to the outer shell of the tensioning driving part, and the other side thereof abuts against the pressing sleeve; The fastening bolts pass through the support guide sleeves and are fixedly connected to the bracket; The support guide sleeves are slidably arranged between the fastening bolts and the push plate.

9. The centering and tensioning fixture according to claim 1, wherein, A clamping driving part is installed on the fixture bottom plate, and the outer shell of the clamping driving part is hinged to the clamping claw; The bottom end of the clamping claw is connected to the driving end of the clamping driving part. The top end of the clamping claw is arranged on the outside along the axis of the fixture body. An abutting part adapted to the clamping claw is arranged on the outer shell of the fixture body. The clamping claw is used to abut the workpiece against the abutting part to clamp it axially along the fixture body.

10. The centering and tensioning fixture according to claim 1, characterized in that A vertically arranged limiting post is fixedly provided on the fixture bottom plate. The limiting post is located outside the fixture body and is used to support the workpiece and limit its rotation around the axis of the fixture body.

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