Self-centering fixture for circular arc type parts

Abstract

The application belongs to the technical field of part machining, in particular to a self-centering fixture for arc-shaped parts, which comprises a base plate, an internally hollow fixing plate arranged on the base plate, three sliding grooves arranged on the fixing plate, and symmetrically and obliquely arranged outer sliding grooves, a fixing rod slidingly connected in each of the sliding grooves, a connecting block fixedly connected to the fixing rod corresponding to the inner sliding groove, a sliding rod slidingly connected to the fixing plate corresponding to the middle sliding groove and contacting the arc surface of the arc-shaped part, and a pressure applied to gradually move the arc-shaped part towards the middle of the fixing plate until the two ends of the arc-shaped part contact the limiting sliding block, so that the fixing assembly contacts the arc surface and the ends of the arc-shaped part at multiple points, and the sliding rod drives the connecting block to continuously displace axially, so that the ends of the arc-shaped part abut against the limiting sliding block, and the arc-shaped part is clamped and fixed.

Description

Technical Field

[0001] This invention belongs to the field of parts processing technology, specifically a self-centering fixture for arc-shaped parts. Background Technology

[0002] In the mechanical manufacturing process, various parts need to be drilled, cut, ground, polished, and inspected. Fixtures are needed to fix the parts in place during the processing to facilitate the processing of the parts.

[0003] Traditional parts fixing fixtures are generally divided into universal fixtures such as bench vises, suction cups and rotary tables, special fixtures such as lathe fixtures, milling machine fixtures and drilling molds, and combination fixtures used for small batch production. These fixtures can fix all kinds of parts.

[0004] However, when it comes to clamping arc-shaped parts, although universal clamps such as bench vises are highly applicable, they cannot center the parts, making the operation cumbersome when centering arc-shaped parts. When using special clamps, although they meet the requirement of self-centering clamping, their applicability is low and they cannot fix arc-shaped parts of different specifications. Summary of the Invention

[0005] To address the aforementioned problems, this invention proposes a self-centering fixture for arc-shaped parts.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: A self-centering fixture for arc-shaped parts, comprising a base plate; a hollow fixing plate is provided on the base plate; three sliding grooves are provided on the fixing plate, and the outer sliding grooves are symmetrically inclined; a fixing rod is slidably connected in each sliding groove; a connecting block is fixedly connected to the fixing rod corresponding to the inner sliding groove; a sliding rod is slidably connected to the fixing plate corresponding to the middle sliding groove, and the end of the sliding rod is rotatably connected to the connecting block; a limiting block is provided inside the fixing plate corresponding to the outer sliding groove; a first limiting groove is provided on each limiting block, and the fixing rod is located in the corresponding first limiting groove; a fixing component is provided at the upper end of each fixing rod, and the fixing component includes a limiting slider for fixing the arc-shaped part.

[0007] Preferably, the fixing component includes a circular hole; a linkage block is rotatably connected to each circular hole; a first positioning rod is symmetrically arranged and rotatably connected to each linkage block; a limit slider is slidably connected to one end of the fixing plate away from the slide rod; a locking component is provided on both sides of the limit slider, and the locking component is used to fix the limit slider.

[0008] Preferably, the locking assembly includes a cavity; each of the limiting sliders is slidably connected to a rod at a position corresponding to the cavity; each of the rods is fixedly connected to a limiting ring at a position corresponding to the cavity; each of the cavities is fitted with a return spring at a position corresponding to the outer side of the limiting ring; and each of the fixed plates has equally spaced cuts at positions corresponding to the rods.

[0009] Preferably, the slide rod is a ball screw; a first hinge block is fixedly connected to one side of the limiting block near the slide rod; a second hinge block is rotatably connected to the slide rod; a support rod is rotatably connected to each of the second hinge blocks, and the other end of each support rod is rotatably connected to the corresponding first hinge block; a connecting hole is provided in the connecting block; a second round block is fixedly connected to the slide rod at the position corresponding to the connecting hole, and the second round block is rotatably connected to the connecting hole.

[0010] Preferably, the end of the slide bar away from the second circular block is fixedly connected to the first circular block; an electric actuator is fixedly connected to the base plate by screws; the output end of the electric actuator is fixedly connected to a connector, and the first circular block is rotatably connected within the connector.

[0011] Preferably, the cut is wedge-shaped, and the end of the insert rod is inserted into the cut; the edge of the substrate is provided with a scale, and the scale is used to adjust the position of the limiting slider.

[0012] Preferably, the limiting slider has a groove; a bidirectional lead screw that penetrates the side wall of the limiting slider is rotatably connected inside the groove; a second positioning rod is rotatably connected inside the bidirectional lead screw at a position corresponding to both sides of the groove, and the end of the second positioning rod is semi-circular; a handwheel is fixedly connected to the outer end of the bidirectional lead screw; a guide rod is fixedly connected inside the groove at a position corresponding to both sides of the bidirectional lead screw, and the second positioning rod is slidably connected to the guide rod.

[0013] Preferably, the four corners of the bottom of the fixing plate are fixed with connecting posts; the fixing plate and the base plate are fixedly connected by the connecting posts and countersunk nails.

[0014] Preferably, the center of the fixed plate is provided with a second limiting groove arranged symmetrically in the upper and lower parts corresponding to the position of the sliding groove, and the connecting block is slidably connected in the second limiting groove.

[0015] Preferably, the limiting slider is made of silicone.

[0016] The beneficial effects of this invention are:

[0017] 1. This invention provides a self-centering fixture for arc-shaped parts. First, the position of the fixing component is adjusted and fixed according to the specifications of the arc-shaped part. Then, the arc-shaped part is placed on the upper surface of the fixing plate with the arc surface facing the slide rod. Then, by moving the slide rod horizontally, the slide rod drives the connecting block to move axially, which in turn drives the limiting block to move horizontally. As the slide rod drives the connecting block to slide axially in the second limiting groove, the fixing component moves synchronously with the limiting block and contacts the arc surface of the arc-shaped part through the cooperation of the first limiting groove and the slide groove in the limiting block. By applying pressure, the arc-shaped part gradually moves towards the center of the fixing plate until the two ends of the arc-shaped part contact the limiting slider. This causes the fixing component to contact the arc surface and ends of the arc-shaped part at multiple points. The slide rod drives the connecting block to continuously move axially, so that the ends of the arc-shaped part press against the limiting slider, thereby achieving the clamping and fixing of the arc-shaped part.

[0018] 2. This invention provides a self-centering fixture for arc-shaped parts. When the sliding rod moves horizontally, it is configured as a unidirectional lead screw rotatably connected to a fixed plate. The sliding rod can rotate synchronously. Because the limiting block is hinged to the second hinge block via the cooperation of the first hinge block and the support rod, when the sliding rod rotates, the second hinge block is threadedly connected to the sliding rod, and the second hinge block does not rotate under the cooperation of the support rod. The second hinge block moves horizontally on the sliding rod, causing the symmetrically arranged limiting blocks to deflect synchronously. Through the coordinated limiting of the fixed rod by the first limiting groove and the sliding groove, the limiting blocks, when deflected synchronously, can drive the symmetrically arranged... The fixed rods move synchronously. As the slide bar continues to move axially toward the fixed plate, the two outer fixed rods gradually move away from the middle fixed rod, and the angle of the arc around which the three fixed rods are located increases. According to the principle that three points form a circle, the angle of the arc formed between the three fixed rods changes. With the upper end of the fixed rod rotatably connected to the linkage block and the first positioning rod rotatably connected to the linkage block, arcs of different sizes and specifications can be clamped. When the first positioning rod clamps and fixes the arc part, it can always be in contact with the surface of the arc part and drive the eccentric arc part to be centered. With the help of the limiting slider, the arc part is clamped and fixed. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0020] Figure 1 This is a perspective view of the present invention;

[0021] Figure 2 This is a cross-sectional view of the present invention;

[0022] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 This is an exploded view of the slide bar structure in this invention;

[0024] Figure 5 This is a cross-sectional view of the locking component structure of the present invention;

[0025] Figure 6 This is a cross-sectional view of the bidirectional lead screw structure of the present invention;

[0026] Figure 7 This is an exploded view of the first positioning rod structure of the present invention;

[0027] Legend:

[0028] 1. Base plate; 2. Fixing plate; 3. Slide groove; 4. Electric actuator; 5. Slide rod; 6. Fixing rod; 7. Connecting block; 8. Limiting block; 9. First limiting groove; 10. First hinge block; 11. Support rod; 12. Second hinge block; 13. Circular hole; 14. Linkage block; 15. First positioning rod; 16. Limiting slider; 17. Groove; 18. Bidirectional lead screw; 19. Second positioning rod; 20. Handwheel; 21. Guide rod; 22. Cutout; 23. Cavity; 24. Insert rod; 25. Limiting ring; 26. Return spring; 27. Scale; 28. First circular block; 29. ​​Connector; 30. Second circular block; 31. Connecting hole; 32. Connecting post; 33. Second limiting groove. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figure 1 - Figure 7This invention provides a self-centering fixture for arc-shaped parts, comprising a base plate 1; a hollow fixing plate 2 is provided on the base plate 1; three sliding grooves 3 are provided on the fixing plate 2, and the outer sliding grooves 3 are symmetrically inclined; a fixing rod 6 is slidably connected in each of the sliding grooves 3; a connecting block 7 is fixedly connected to the fixing rod 6 corresponding to the inner sliding groove 3; a sliding rod 5 is slidably connected on the fixing plate 2 corresponding to the position of the middle sliding groove 3, and the end of the sliding rod 5 is rotatably connected to the connecting block 7; a limiting block 8 is provided inside the fixing plate 2 at the position corresponding to the outer sliding groove 3; a first limiting groove 9 is provided on each limiting block 8, and the fixing rod 6 is located in the corresponding first limiting groove 9; a fixing component is provided at the upper end of each fixing rod 6, and the fixing component includes a limiting slider 16 for fixing the arc-shaped parts. To achieve self-centering and expand the clamping range when fixing arc-shaped parts, the device is first adjusted and fixed according to the specifications of the arc-shaped part. Then, the arc-shaped part is placed on the upper surface of the fixing plate 2 with its curved surface facing the slide rod 5. The slide rod 5 is then moved horizontally, causing the connecting block 7 to move axially, which in turn moves the limiting block 8 horizontally. As the slide rod 5 moves the connecting block 7, it slides within the second limiting groove 33, resulting in axial displacement. Through the cooperation of the first limiting groove 9 and the sliding groove 3 within the limiting block 8, the fixing component moves synchronously with the limiting block 8 and contacts the arc surface of the arc-shaped part. By applying pressure, the arc-shaped part gradually moves towards the center of the fixing plate 2 until the two ends of the arc-shaped part contact the limiting slider 16. This causes the fixing component to contact the arc surface and ends of the arc-shaped part at multiple points. The sliding rod 5 drives the connecting block 7 to continuously move axially, causing the ends of the arc-shaped part to press against the limiting slider 16, thus achieving the clamping and fixing of the arc-shaped part.

[0031] It is worth noting that when fixing arc-shaped parts, the device continuously applies forces at multiple points due to the symmetrically arranged fixing components, forcing the arc-shaped parts to constantly adjust their position and gradually move closer to the center line, achieving a self-centering effect. Therefore, the parts can be placed arbitrarily in the middle of the fixing plate 2 without deliberately aligning the middle of the arc-shaped parts with the center line of the fixing plate 2. In other words, the device can self-center and fix arc-shaped parts of various specifications by arbitrarily placing them, as long as the arc surface faces the slide bar 5. The operation is simple, convenient and practical.

[0032] Furthermore, such as Figure 1 and Figure 7As shown, the fixing component includes a circular hole 13 coaxially opened on the top of the fixing rod 6; a linkage block 14 is rotatably connected to the circular hole 13; first positioning rods 15 are symmetrically arranged and rotatably connected to both ends of the linkage block 14; a limit slider 16 is slidably connected to one end of the fixing plate 2 away from the slide rod 5; locking components are provided on both sides of the limit slider 16, and the locking components are used to fix the limit slider 16. To achieve the desired fixation of the arc-shaped part, during the actual operation, the position of the limiting slider 16 is first adjusted according to the size of the arc-shaped part and the processing requirements. After adjustment, arc-shaped parts of the same specification or batch can be placed on the upper surface of the fixing plate 2. Then, the fixing rod 6 drives the linkage block 14 and the first positioning rod 15 to move. The first positioning rod 15 applies pressure to the arc-shaped part, causing the arc-shaped part to move towards the limiting slider 16. During the movement, the position of the arc-shaped part is adjusted to be centered, specifically until the arc surface of the arc-shaped part contacts multiple first positioning rods 15. At this point, the arc-shaped part is centered, and finally, both ends of the arc-shaped part are pressed against the surface of the limiting slider 16, completing the fastening and clamping of the arc-shaped part. During this process, multiple points on the surface of the arc-shaped part are clamped and fixed, resulting in good clamping stability and improved processing accuracy.

[0033] It is worth noting that by positioning the limiting slider 16 away from the slide bar 5, it can be used for arc-shaped parts of various sizes. However, considering the overall size of the device, the slide bar 5 should not be set too long. Therefore, when clamping arc-shaped parts, the position of the limiting slider 16 can be adjusted first so that there is enough space between the limiting slider 16 and the connecting block 7 to place the arc-shaped part. Then, the slide bar 5 can be operated, and the adjustment stroke required for the slide bar 5 is small.

[0034] Furthermore, such as Figure 5 As shown, the locking assembly includes a cavity 23; each of the limiting sliders 16 is slidably connected to a rod 24 at a position corresponding to the cavity 23; each of the rods 24 is fixedly connected to a limiting ring 25 at a position corresponding to the cavity 23; each of the cavity 23 is fitted with a return spring 26 at a position corresponding to the outer side of the limiting ring 25; and each of the fixing plates 2 has equally spaced cuts 22 at positions corresponding to the rods 24. To facilitate adjustment and fixation of the limiting slider 16, in practical use, if it is necessary to adjust and fix the position of the limiting slider 16, the end of the rod 24 can be separated from the cut 22 by pushing the rod 24 outward, thus releasing the engagement between the rod 24 and the cut 22. At this time, the limiting slider 16 can be moved. After adjustment, the outward force applied to the rod 24 is released, and the rod 24, under the action of the return spring 26, inserts into the corresponding cut 22, achieving the purpose of fixing the limiting slider 16.

[0035] Furthermore, such as Figure 2 and Figure 4As shown, the slide rod 5 is a ball screw; a first hinge block 10 is fixedly connected to the side of the limiting block 8 near the slide rod 5; a second hinge block 12 is threadedly connected to the slide rod 5; a support rod 11 is rotatably connected to each of the second hinge blocks 12, and the other end of each support rod 11 is rotatably connected to the corresponding first hinge block 10; a connecting hole 31 is provided in the connecting block 7; a second round block 30 is fixedly connected to the slide rod 5 at the position corresponding to the connecting hole 31, and the second round block 30 is rotatably connected to the connecting hole 31. Since this device can only clamp parts with a fixed curvature during use, to further expand its applicability, when the slide rod 5 moves horizontally, it is configured as a one-way lead screw rotatably connected to the fixed plate 2. The slide rod 5 can rotate synchronously. Because the limiting block 8 is hinged to the second hinge block 12 through the cooperation of the first hinge block 10 and the support rod 11, when the slide rod 5 rotates, the second hinge block 12 is threadedly connected to the slide rod 5, and the second hinge block 12 will not rotate under the cooperation of the support rod 11. The second hinge block 12 moves horizontally on the slide rod 5, and drives the symmetrically arranged limiting blocks 8 to deflect synchronously. Through the coordinated limiting of the fixed rod 6 by the first limiting groove 9 and the sliding groove 3, the limiting blocks... 8. During synchronous deflection, the symmetrically arranged fixed rods 6 can be driven to move synchronously. As the slide rod 5 continues to move axially toward the fixed plate 2, the two outer fixed rods 6 gradually move away from the middle fixed rod 6, and the angle of the arc around which the three fixed rods 6 are located increases. According to the principle of three points forming a circle, the angle of the arc formed between the three fixed rods 6 changes. With the upper end of the fixed rod 6 rotatably connected to the linkage block 14 and the first positioning rod 15 rotatably connected to the linkage block 14, arcs of different sizes and specifications can be clamped. When the first positioning rod 15 clamps and fixes the arc part, it can always be in contact with the surface of the arc part and drive the eccentric arc part to be centered. With the help of the limiting slider 16, the arc part can be clamped and fixed.

[0036] Furthermore, such as Figure 2 As shown, the end of the slide rod 5 away from the second circular block 30 is fixedly connected to the first circular block 28; an electric actuator 4 is fixedly connected to the base plate 1 by screws; the output end of the electric actuator 4 is fixedly connected to a connector 29, and the first circular block 28 is rotatably connected within the connector 29. The electric actuator 4 can drive the slide rod 5 to move axially, and with the cooperation of the connector 29 and the first circular block 28, when the electric actuator 4 drives the slide rod 5 to move axially, it cooperates with the threads on the fixing plate 2, causing the slide rod 5 to rotate.

[0037] Furthermore, such as Figure 5As shown, the cut 22 is wedge-shaped, and the end of the insert rod 24 is inserted into the cut 22. The edge of the base plate 1 is provided with a scale 27, which is used to adjust the position of the limiting slider 16. In order to further facilitate the adjustment and fixing of the position of the limiting slider 16, in actual use, the position of the limiting slider 16 can be directly adjusted according to the distance shown by the scale 27. With the cooperation of the wedge-shaped cut 22, the insert rod 24 can move outward without hindering the limiting slider 16 from moving towards the side of the slide rod 5. At the same time, when clamping and fixing the arc part, since the other end of the cut 22 is not set as a wedge, the insert rod 24 cannot move, which can achieve the purpose of quickly and conveniently fixing the limiting slider 16.

[0038] Furthermore, such as Figure 6 As shown, the limiting slider 16 has a groove 17; a bidirectional lead screw 18, penetrating the side wall of the limiting slider 16, is rotatably connected inside the groove 17; a second positioning rod 19 is rotatably connected inside the bidirectional lead screw 18 at positions corresponding to both sides of the groove 17, and the end of the second positioning rod 19 is semi-circular; a handwheel 20 is fixedly connected to the outer end of the bidirectional lead screw 18; a guide rod 21 is fixedly connected inside the groove 17 at positions corresponding to both sides of the bidirectional lead screw 18, and the second positioning rod 19 is slidably connected to the guide rod 21. When the arc-shaped part to be fixed is a complete circle, the handwheel 20 is manually rotated or the bidirectional lead screw 18 is driven by a motor to rotate, causing the second positioning rod 19 to move synchronously in opposite directions. The semi-circular end of the second positioning rod 19 is used to clamp the complete circular arc-shaped part close to both sides of the limiting slider 16, improving the fixing stability of the complete circular arc-shaped part. During this process, the guide rod 21 improves the sliding stability of the second positioning rod 19.

[0039] Furthermore, such as Figure 1 As shown, connecting posts 32 are fixed to the four corners of the bottom of the fixing plate 2; the fixing plate 2 and the base plate 1 are fixedly connected by the connecting posts 32 and countersunk nails. In order to achieve the effect of fixing the fixing plate 2, in actual use, the fixing plate 2 and the base plate 1 are connected by the connecting posts 32 and countersunk nails, with a certain distance between them, so as to facilitate the limiting slider 16 to be limited and improve the movement stability of the limiting slider 16.

[0040] Furthermore, such as Figure 2 and Figure 5 As shown, the center of the fixed plate 2 is provided with a second limiting groove 33 arranged symmetrically in the upper and lower parts corresponding to the position of the sliding groove 3, and the connecting block 7 is slidably connected within the second limiting groove 33. The second limiting groove 33 limits the connecting block 7, improves the stability of the connecting block 7 during horizontal movement, and prevents the connecting block 7 from getting stuck during movement.

[0041] Furthermore, such as Figure 1 As shown, the limiting slider 16 is made of silicone. Silicone has the characteristics of wear resistance, temperature resistance, corrosion resistance, tear resistance and high toughness. It is suitable for contact clamping of curved parts. It can not only protect the curved parts and avoid local damage, but also increase friction and improve clamping fixation.

[0042] Working principle:

[0043] First, the position of the fixing component is adjusted and fixed according to the specifications of the arc-shaped part. Then, the arc-shaped part is placed on the upper surface of the fixing plate 2 with the arc surface of the arc-shaped part facing the slide bar 5. Then, by moving the slide bar 5 horizontally, the slide bar 5 drives the connecting block 7 to move axially, which in turn drives the limiting block 8 to move horizontally. As the slide bar 5 drives the connecting block 7 to slide axially in the second limiting groove 33, the fixing component moves synchronously with the limiting block 8 through the cooperation of the first limiting groove 9 and the slide groove 3 in the limiting block 8, and contacts the arc surface of the arc-shaped part. By applying pressure, the arc-shaped part gradually moves towards the middle of the fixing plate 2 until the two ends of the arc-shaped part contact the limiting slider 16. This causes the fixing component to contact the arc surface and the ends of the arc-shaped part at multiple points. The slide bar 5 drives the connecting block 7 to continuously move axially, so that the ends of the arc-shaped part press against the limiting slider 16, thereby achieving the clamping and fixing of the arc-shaped part.

[0044] When the slide rod 5 moves horizontally, it is configured as a one-way lead screw rotatably connected to the fixed plate 2. The slide rod 5 can rotate synchronously. Since the limiting block 8 is hinged to the second hinge block 12 through the cooperation of the first hinge block 10 and the support rod 11, when the slide rod 5 rotates, the second hinge block 12 is threadedly connected to the slide rod 5, and the second hinge block 12 will not rotate under the cooperation of the support rod 11. The second hinge block 12 moves horizontally on the slide rod 5 and drives the symmetrically arranged limiting blocks 8 to deflect synchronously. Through the coordinated limiting of the fixed rod 6 by the first limiting groove 9 and the sliding groove 3, the limiting block 8 can drive the symmetrically arranged fixed rod 6 to move forward when it deflects synchronously. As the slide bar 5 moves axially toward the fixed plate 2, the two outer fixed bars 6 gradually move away from the middle fixed bar 6, and the angle of the arc formed by the three fixed bars 6 increases. According to the principle of three points forming a circle, the angle of the arc formed between the three fixed bars 6 changes. With the upper end of the fixed bar 6 rotatably connected to the linkage block 14 and the first positioning rod 15 rotatably connected to the linkage block 14, arcs of different sizes and specifications can be clamped. When the first positioning rod 15 clamps and fixes the arc part, it can always be in contact with the surface of the arc part and drive the eccentric arc part to be centered. With the help of the limiting slider 16, the arc part is clamped and fixed.

[0045] When the arc-shaped part to be fixed is a complete circle, the handwheel 20 is turned manually or the bidirectional lead screw 18 is driven by a motor to rotate, so that the second positioning rod 19 moves synchronously in opposite directions. The semi-circular end of the second positioning rod 19 is used to clamp the arc-shaped part close to both sides of the limiting slider 16, thereby improving the fixing stability of the arc-shaped part. During this process, the sliding stability of the second positioning rod 19 is improved by the setting of the guide rod 21.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A self-centering fixture for arc-shaped parts, characterized in that: The system includes a base plate (1); a hollow fixing plate (2) is provided on the base plate (1); three sliding grooves (3) are provided on the fixing plate (2), including two outer sliding grooves (3) and one middle sliding groove (3), and the two outer sliding grooves (3) are symmetrically inclined about the middle sliding groove (3) as the axis of symmetry. A fixing rod (6) is slidably connected in each of the sliding grooves (3); a connecting block (7) is fixedly connected to the fixing rod (6) corresponding to the middle sliding groove (3); a sliding rod (5) is slidably connected on the fixing plate (2) at the position corresponding to the middle sliding groove (3), and the end of the sliding rod (5) is rotatably connected to the connecting block (7); a limiting block (8) is provided in the interior of the fixing plate (2) at the position corresponding to the outer sliding groove (3); a first limiting groove (9) is provided on each limiting block (8), and the fixing rod (6) is located in the corresponding first limiting groove (9); the system also includes a fixing component, and the fixing component includes a limiting slider (16) for fixing arc-shaped parts; The fixing component includes a circular hole (13); a linkage block (14) is rotatably connected to each circular hole (13); a first positioning rod (15) is rotatably connected to each linkage block (14); a limit slider (16) is slidably connected to one end of the fixing plate (2) away from the slide rod (5); a locking component is provided on both sides of the limit slider (16), and the locking component is used to fix the limit slider (16). The locking assembly includes a cavity (23); the limiting slider (16) is slidably connected to a rod (24) at a position corresponding to the cavity (23); the rod (24) is fixedly connected to a limiting ring (25) at a position corresponding to the cavity (23); a return spring (26) is sleeved inside the cavity (23) at a position corresponding to the outside of the limiting ring (25); and the fixing plate (2) has equidistant cuts (22) at positions corresponding to the rod (24).

2. The self-centering fixture for arc-shaped parts according to claim 1, characterized in that: The slide rod (5) is a ball screw; a first hinge block (10) is fixedly connected to one side of the limiting block (8) near the slide rod (5); a second hinge block (12) is rotatably connected to the slide rod (5); a support rod (11) is rotatably connected to the second hinge block (12), and the other end of the support rod (11) is rotatably connected to the corresponding first hinge block (10); a connecting hole (31) is provided in the connecting block (7); a second round block (30) is fixedly connected to the slide rod (5) at the position corresponding to the connecting hole (31), and the second round block (30) is rotatably connected to the connecting hole (31).

3. A self-centering fixture for arc-shaped parts according to claim 2, characterized in that: The first round block (28) is fixedly connected to one end of the slide bar (5) away from the second round block (30); an electric push rod (4) is fixedly connected to the base plate (1) by screws; a connector (29) is fixedly connected to the output end of the electric push rod (4), and the first round block (28) is rotatably connected within the connector (29).

4. A self-centering fixture for arc-shaped parts according to claim 3, characterized in that: The cut (22) is wedge-shaped, and the end of the insert (24) is inserted into the cut (22); the substrate (1) has a scale (27) on its side, and the scale (27) is used to adjust the position of the limiting slider (16).

5. A self-centering fixture for arc-shaped parts according to claim 4, characterized in that: The limiting slider (16) has a groove (17); a bidirectional lead screw (18) that penetrates the side wall of the limiting slider (16) is rotatably connected inside the groove (17); a positioning slide rod (5) is rotatably connected inside the bidirectional lead screw (18) corresponding to the two sides of the groove (17), and the end of the second positioning rod (19) is semi-circular; a handwheel (20) is fixed to the outer end of the bidirectional lead screw (18); a guide rod (21) is fixed to the two sides of the bidirectional lead screw (18) inside the groove (17), and the second positioning rod (19) is slidably connected to the guide rod (21).

6. A self-centering fixture for arc-shaped parts according to claim 5, characterized in that: The fixing plate (2) has connecting posts (32) fixed at the four corners of its bottom; the fixing plate (2) and the base plate (1) are fixedly connected by the connecting posts (32) and countersunk nails.

7. A self-centering fixture for arc-shaped parts according to claim 6, characterized in that: The fixed plate (2) has a second limiting groove (33) arranged symmetrically in the upper and lower parts corresponding to the position of the sliding groove (3) at its center, and the connecting block (7) slides within the second limiting groove (33).

8. A self-centering fixture for arc-shaped parts according to claim 7, characterized in that: The limiting slider (16) is made of silicone.

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