A multi-directional clamping tool for special-shaped workpieces

Abstract

The present application relates to the technical field of tooling and fixtures, and in particular to a multi-directional clamping tool for special-shaped workpieces, including positioning tools distributed at four corners for clamping the special-shaped workpiece, wherein the special-shaped workpiece includes a first extension portion and two second extension portions extending at different angles, the first extension portion and the second extension portion are vertically arranged, and the main body of the special-shaped workpiece is concave when viewed from above; a single positioning tool includes: a placement table, on which a first positioning block, a second positioning block and a third positioning block are installed, for placing the special-shaped workpiece; a support block, for supporting the first extension portion of the special-shaped workpiece; a first clamping portion, including a first oil cylinder, a first rod, a driven plate, and a second rod, wherein a first clamping block is installed on the second rod for clamping the second extension portion on the special-shaped workpiece; a first trigger plate, and a first contact matching therewith, wherein the first trigger plate is installed on the driven plate.

Description

Technical Field

[0001] The present application relates to the technical field of tooling and fixtures, and in particular to a multi-directional clamping tooling for special-shaped workpieces. Background Art

[0002] The automobile brake system is a key component to ensure driving safety. The brake disc bracket is an important component that supports the brake disc. Its processing accuracy directly affects the performance and stability of the entire brake system. In the traditional processing process, the brake disc bracket often has complex three-dimensional contours and irregular surface features due to its unique shape and structural design, which brings significant challenges to processing positioning and clamping.

[0003] Existing traditional fixtures generally have the following problems when dealing with such special-shaped workpieces: First, since the design of standard fixtures is usually based on regular geometric shapes, they are difficult to adapt to the special contours of brake disc brackets, resulting in unstable clamping, easy vibration and offset during processing, seriously affecting the dimensional accuracy and surface quality of the parts. Secondly, traditional fixtures lack positioning support for specific parts, resulting in uneven distribution of processing stress, which may cause deformation of the workpiece and increase the difficulty of subsequent assembly. Furthermore, the clamping force of traditional fixtures is often difficult to control accurately. Excessive clamping force may cause local compression and deformation of the workpiece, while insufficient clamping force will reduce processing safety.

[0004] In this regard, the present application proposes a multi-directional clamping tool for special-shaped workpieces to solve the problem. Summary of the invention

[0005] The purpose of this application is to solve at least one of the technical deficiencies.

[0006] To this end, one purpose of the present application is to propose a multi-directional clamping fixture for special-shaped workpieces to solve the problems mentioned in the background technology and overcome the shortcomings of the prior art.

[0007] In order to achieve the above-mentioned purpose, an embodiment of one aspect of the present application provides a multi-directional clamping tool for a special-shaped workpiece, including positioning tools distributed at four corners, used to clamp the special-shaped workpiece, wherein the special-shaped workpiece includes a first extension portion and two second extension portions extending at different angles, the first extension portion and the second extension portion are arranged vertically, and the main body of the special-shaped workpiece is concave when viewed from above; a single positioning tool includes: a placement table, on which a first positioning block, a second positioning block and a third positioning block are installed, for placing the special-shaped workpiece; a support block, for supporting the first extension portion of the special-shaped workpiece; The first clamping part includes a first oil cylinder, a first rod, a driven plate, and a second rod, wherein the second rod is equipped with a first clamping block for clamping and locking the second extension part on the special-shaped workpiece; a first trigger plate, and a first contact matched therewith, wherein the first trigger plate is mounted on the driven plate, and is used to cooperate with the first clamping part; the second clamping part includes a second oil cylinder, a connecting plate, and a third rod, wherein the third rod is equipped with a second clamping block for clamping and locking the first extension part on the special-shaped workpiece; a second trigger plate, and a second contact matched therewith, wherein, the second trigger plate is mounted on the connecting plate to cooperate with the second pressing part; the pressing part includes a mounting frame, a third oil cylinder, and a deflection block, wherein the third oil cylinder is mounted with a driving block, the driving block is arranged on the deflection block, the deflection block is rotatably arranged on the mounting frame, and three pressing blocks are mounted on one end of the deflection block to press and lock the first extension part and the second extension part on the special-shaped workpiece; a third trigger plate, and a third contact matched therewith, wherein the third trigger plate is mounted on the driving block to cooperate with the pressing part; when working, the first oil cylinder works first After the first oil cylinder finishes working, the second oil cylinder starts working, and the first clamping block and the second clamping block are driven successively to clamp the second extension part and the first extension part respectively, and the first trigger plate and the second trigger plate follow the movement, and cooperate with the first contact and the second contact for monitoring respectively. When the first trigger plate contacts the first contact, the first oil cylinder stops, and after the second trigger plate contacts the second contact, the second oil cylinder stops, and then the clamping part works, and the clamping block is driven by the third oil cylinder to clamp the first extension part and the second extension part, and the third trigger plate follows the movement, and when the third trigger plate contacts the third contact, the third oil cylinder is stopped.

[0008] Preferably, any of the above schemes is that the clamping part also includes a tensioning assembly for tightening the first extension part on the special-shaped workpiece; the tensioning assembly includes: an expansion plate, installed on the deflection block, and following the movement of the deflection block; a driving rod, on which a spherical part is installed, cooperating with the expansion plate; a driven rod, one end of which is an inclined surface, and is driven to move by the driving rod, and a baffle is installed on the driven rod, and a spring is installed on the baffle, and the spring is used to reset the driven rod; a plurality of tensioning blocks are symmetrically distributed along the axis of the driven rod, one end of the tensioning block is an inclined surface, and is driven to move by the driven rod, and a guide groove is provided on the tensioning block; a guide rod, which slidably cooperates with the guide groove to support and limit the tensioning block.

[0009] Preferably, the two ends of the top of the output rod of the first oil cylinder are inclined surfaces, and a positioning groove is provided on the inclined surface; one end of the first rod is an inclined surface, and a positioning block is installed on the inclined surface, and the positioning block is slidably set in the positioning groove to cooperate with the output rod; a first guide groove is provided on the other end of the first rod; a first stop groove is provided on the second rod, and a second guide groove is provided at one end of the second rod; guide blocks are installed on both ends of the driven plate, and the two guide blocks are slidably set in the first guide groove and the second guide groove respectively.

[0010] Preferably, any of the above schemes is that the first pressing part further includes a fourth oil cylinder, and an output rod of the fourth oil cylinder is provided with an inclined surface, which cooperates with the first stop groove to lock the second rod.

[0011] Preferably, in any of the above schemes, the connecting plate is mounted on the output rod of the second oil cylinder, the connecting plate is connected to the third rod, and the third rod is provided with a second stop groove.

[0012] Preferably, any of the above schemes is that the second pressing portion further includes a fifth oil cylinder, and an output rod of the fifth oil cylinder is provided with an inclined surface, which cooperates with the second stop groove to lock the third rod.

[0013] Preferably, the clamping part further includes: a slide rail, inside which a sliding block is slidably arranged, one end of the sliding block is an inclined surface, and a connecting groove is provided on the inclined surface; a connecting block, one end of which is an inclined surface for cooperating with the sliding block, and the connecting block is connected to the third oil cylinder; an eighth oil cylinder, the output rod of the eighth oil cylinder is connected to the sliding block, and is used to drive the sliding block to lock the third oil cylinder.

[0014] Preferably, any of the above schemes is that a sixth oil cylinder is installed at one end of the support block for driving the support block to move.

[0015] Preferably, any of the above schemes is that a groove is provided on the special-shaped workpiece, which is distributed on the first extension part and the second extension part; the number of the first positioning block and the second positioning block are both two, which are symmetrically distributed on the placement table, the first positioning block is used to position the side end of the second extension part on the special-shaped workpiece, and the second positioning block is used to support the bottom end of the special-shaped workpiece; the number of the third positioning block is single, which supports and positions the groove on the special-shaped workpiece, mainly supporting the midpoint position of the groove distributed on the first extension part.

[0016] Preferably, any of the above schemes includes a single positioning tool that also includes an auxiliary support portion for auxiliary supporting and tightening the second extension portion on the special-shaped workpiece; the auxiliary support portion includes: an auxiliary rod having a driving groove formed thereon, an auxiliary block being installed at one end of the auxiliary rod; and a seventh oil cylinder, wherein an output rod of the seventh oil cylinder is provided with an inclined surface for cooperating with the driving groove to drive the auxiliary rod to move.

[0017] Compared with the prior art, the advantages and beneficial effects of this application are:

[0018] 1. Through the first clamping part, the second clamping part and the pressing part, the top, bottom and side ends of each extension part of the special-shaped workpiece are clamped in multiple directions and balanced, so that the stress on the workpiece is uniform, the shaking of the workpiece during processing is avoided, and the processing stability is improved.

[0019] 2. The first abutting part, the second abutting part and the pressing part are driven and stopped through the first trigger plate, the first contact point, the second trigger plate, the second contact point, the third trigger plate and the third contact point, and more precise adjustment and instant feedback are provided to improve the accuracy of positioning.

[0020] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 It is a three-dimensional schematic diagram according to an embodiment of the present application;

[0023] Figure 2 It is a partial schematic diagram according to an embodiment of the present application;

[0024] Figure 3 According to the embodiment of the present application Figure 2 The enlarged schematic diagram at A in the middle;

[0025] Figure 4 According to the embodiment of the present application Figure 2 The enlarged schematic diagram of point B in the middle;

[0026] Figure 5 It is a schematic diagram of the internal structure according to an embodiment of the present application;

[0027] Figure 6 It is a schematic diagram of the structure of the placement table according to an embodiment of the present application;

[0028] Figure 7 It is a partial internal schematic diagram according to an embodiment of the present application;

[0029] Figure 8 According to the embodiment of the present application Figure 7 The enlarged schematic diagram at C in the middle;

[0030] Fig. 9 This is a schematic diagram of a first abutting portion according to an embodiment of the present application;

[0031] Fig.10 This is a schematic diagram of the installation of the guide block according to an embodiment of the present application;

[0032] Fig.11 It is a partial cross-sectional schematic diagram of the first abutting portion according to an embodiment of the present application;

[0033] Fig.12 This is a schematic diagram of a second abutting portion according to an embodiment of the present application;

[0034] Fig.13 It is a partial schematic diagram of the pressing part according to an embodiment of the present application;

[0035] Fig.14 This is a schematic diagram of a tensioning assembly according to an embodiment of the present application;

[0036] Fig.15 This is a schematic diagram of the connection of the driving rod according to an embodiment of the present application;

[0037] Fig.16 It is a partial cross-sectional schematic diagram of a pressing portion according to an embodiment of the present application;

[0038] Fig.17 This is a schematic top view of a special-shaped workpiece according to an embodiment of the present application;

[0039] Fig.18 This is a schematic diagram of a special-shaped workpiece from a first perspective according to an embodiment of the present application;

[0040] Fig.19 is a schematic diagram of a second viewing angle of a special-shaped workpiece according to an embodiment of the present application;

[0041] Fig. 20 This is a schematic diagram of the connection of support blocks according to an embodiment of the present application;

[0042] Fig.21 It is a schematic cross-sectional view of the auxiliary support portion according to an embodiment of the present application.

[0043] In the figure: 1, special-shaped workpiece, 101, first extension part, 102, second extension part, 2, placement table, 201, first positioning block, 202, second positioning block, 203, third positioning block, 3, support block, 301, sixth oil cylinder, 4, first pressing part, 401, first oil cylinder, 402, first rod, 403, driven plate, 404, second rod, 405, first pressing block, 406, guide block, 407, fourth oil cylinder, 5, first trigger plate, 501, first contact point, 6, second pressing part, 601, second oil cylinder, 602, connecting plate, 603, third rod, 604, second pressing block, 605, fifth oil cylinder, 7. Second trigger plate, 701, second contact point, 8. Clamping part, 801, mounting frame, 802, third oil cylinder, 803, eighth oil cylinder, 804, deflection block, 805, driving block, 806, clamping block, 807, slide rail, 808, sliding block, 809, guide rod, 810, connecting block, 811, tensioning assembly, 812, expansion plate, 813, driving rod, 814, spherical part, 815, driven rod, 816, baffle, 817, spring, 818, tensioning block, 9. Third trigger plate, 901, third contact point, 10. Auxiliary support part, 1001, auxiliary rod, 1002, auxiliary block, 1003, seventh oil cylinder. DETAILED DESCRIPTION

[0044] like Figures 1 to 21 As shown, a multi-directional clamping fixture for a special-shaped workpiece includes positioning fixtures distributed at four corners for clamping a special-shaped workpiece 1, wherein the special-shaped workpiece 1 includes a first extension portion 101 and two second extension portions 102 extending at different angles, the first extension portion 101 and the second extension portion 102 are vertically arranged, and the special-shaped workpiece 1 is concave in main body when viewed from above.

[0045] Specifically, the special-shaped workpiece 1 is used as a brake disc bracket for an automobile. The number of the second extension parts 102 is two, which are distributed at both ends of the first extension part 101 . The special-shaped workpiece 1 is provided with grooves, which are distributed on the first extension part 101 and the second extension part 102 .

[0046] A single positioning tool comprises: a placement table 2 on which a first positioning block 201 , a second positioning block 202 and a third positioning block 203 are mounted for placing the special-shaped workpiece 1 .

[0047] Specifically, the number of the first positioning block 201 and the second positioning block 202 are both two, which are symmetrically distributed on the placement table 2. The first positioning block 201 is used to position the side end of the second extension portion 102 on the special-shaped workpiece 1, and the second positioning block 202 is used to support the bottom end of the special-shaped workpiece 1.

[0048] The number of the third positioning block 203 is single, and it supports and positions the groove on the special-shaped workpiece 1 , and mainly supports the midpoint position of the groove distributed on the first extension portion 101 .

[0049] The supporting block 3 is used to support the first extending portion 101 of the special-shaped workpiece 1 .

[0050] The first pressing part 4 includes a first oil cylinder 401, a first rod 402, a driven plate 403, and a second rod 404, wherein a first pressing block 405 is installed on the second rod 404 for pressing and locking the second extension part 102 on the special-shaped workpiece 1;

[0051] The first pressing portion 4 not only presses the second extending portion 102 , but also performs a centering operation on the special-shaped workpiece 1 , so that the special-shaped workpiece 1 is located in the middle of the placement table 2 .

[0052] A first trigger plate 5 and a first contact 501 matched therewith, wherein the first trigger plate 5 is mounted on the driven plate 403 to match the first abutting portion 4 .

[0053] The second pressing part 6 comprises a second oil cylinder 601 , a connecting plate 602 and a third rod 603 , wherein a second pressing block 604 is mounted on the third rod 603 for pressing and locking the first extending part 101 on the special-shaped workpiece 1 .

[0054] A second trigger plate 7 and a second contact 701 matched therewith, wherein the second trigger plate 7 is mounted on the connecting plate 602 for matching with the second abutting portion 6 .

[0055] The clamping part 8 includes a mounting frame 801, a third oil cylinder 802, and a deflection block 804, wherein a driving block 805 is installed on the third oil cylinder 802, and the driving block 805 is arranged on the deflection block 804. The deflection block 804 is rotatably set on the mounting frame 801, and three clamping blocks 806 are installed at one end of the deflection block 804 for clamping and locking the first extension part 101 and the second extension part 102 on the special-shaped workpiece 1.

[0056] A third trigger plate 9 and a third contact 901 cooperating therewith, wherein the third trigger plate 9 is mounted on the driving block 805 to cooperate with the pressing portion 8 .

[0057] During operation, the first oil cylinder 401 works first, and the second oil cylinder 601 works after the first oil cylinder finishes working. The first clamping block 405 and the second clamping block 604 are driven successively to clamp the second extension part 102 and the first extension part 101 respectively. The first trigger plate 5 and the second trigger plate 7 follow the movement, and cooperate with the first contact 501 and the second contact 701 for monitoring respectively. When the first trigger plate 5 contacts the first contact 501, the first oil cylinder 401 stops. After the second trigger plate 7 contacts the second contact 701, the second oil cylinder 601 stops. Then the clamping part works, and the clamping block 806 is driven by the third oil cylinder 802 to clamp the first extension part 101 and the second extension part 102. The third trigger plate 9 follows the movement. When the third trigger plate 9 contacts the third contact 901, the third oil cylinder 802 is stopped.

[0058] Further, such as Figure 14 to Figure 15 As shown, the clamping part 8 also includes a tensioning assembly 811 for tightening the first extension part 101 on the special-shaped workpiece 1; the tensioning assembly includes: an expansion plate 812, which is installed on the deflection block 804 and moves with the deflection block 804; a driving rod 813, on which a spherical piece 814 is installed, which cooperates with the expansion plate 812; a driven rod 815, one end of which is an inclined surface, which is driven by the driving rod 813 to move, and a baffle 816 is installed on the driven rod 815, and a spring 817 is installed on the baffle 816, and the spring 817 is used to reset the driven rod 815; a plurality of tensioning blocks 818, which are symmetrically distributed along the axis of the driven rod 815, one end of which is an inclined surface, which is driven by the driven rod 815 to move, and a guide slot is provided on the tensioning block 818; a guide rod 809, which slides with the guide slot to support and limit the tensioning block 818.

[0059] Further, such as Fig.16 As shown, the clamping part 8 also includes: a slide rail 807, inside which a slide block 808 is slidably arranged, and one end of the slide block 808 is a slope; a connecting block 810, one end of which is a slope for cooperating with the slide block 808, and the connecting block 810 is connected to the third oil cylinder 802; an eighth oil cylinder 803, and the output rod of the eighth oil cylinder 803 is connected to the slide block 808, which is used to drive the slide block 808 to lock the third oil cylinder 802.

[0060] The locking process of the third oil cylinder 802 is performed after the pressing action is completed.

[0061] Specifically, the inclined surface on the driven rod 815 cooperates with the driving rod 813, so that when the driving rod 813 moves downward, the driven rod 815 is synchronously driven, thereby driving the tensioning block 818 to assist in clamping the special-shaped workpiece 1;

[0062] After being pressed into place, the eighth oil cylinder 803 is started, driving the sliding block 808 to move. The sliding block 808 moves until the inclined surface on it touches the inclined surface of the connecting block 810. At this time, the third oil cylinder 802 cannot be driven back and is locked.

[0063] Further, such as Figures 9 to 11 As shown, the two ends of the top of the output rod of the first oil cylinder 401 are inclined surfaces, and a positioning groove is provided on the inclined surface; one end of the first rod 402 is an inclined surface, and a positioning block is installed on the inclined surface, and the positioning block is slidably set in the positioning groove to cooperate with the output rod; a first guide groove is provided on the other end of the first rod 402; a first stop groove is provided on the second rod 404, and a second guide groove is provided at one end of the second rod 404; guide blocks 406 are installed at both ends of the driven plate 403, and the two guide blocks 406 are respectively slidably set in the first guide groove and the second guide groove, so as to clamp the side ends of the two second extension parts 102 on the special-shaped workpiece 1, and simultaneously position the workpiece in the middle position of the placement table 2.

[0064] Specifically, the positioning block cooperates with the positioning slot so that the first rod 402 is driven when the output rod of the first oil cylinder 401 is pushed out and retracted.

[0065] The first pressing part 4 further includes a fourth oil cylinder 407 . An output rod of the fourth oil cylinder 407 is provided with an inclined surface, which cooperates with the first stop groove to lock the second rod 404 .

[0066] Specifically, the fourth oil cylinder 407 is controlled by the first trigger plate 5 and the first contact 501. When the first clamping block 405 moves into place, that is, the first trigger plate 5 contacts the first contact 501 and triggers the first contact 501, the fourth oil cylinder 407 is triggered to lock the second rod 404 to avoid the second rod 404 shaking during processing, which leads to reduced processing accuracy.

[0067] The process of locking the second rod 404 is performed after the pressing process is completed.

[0068] Further, such as Fig.12 As shown, the connecting plate 602 is installed on the output rod of the second oil cylinder 601, and the connecting plate 602 is connected to the third rod 603. The third rod 603 is provided with a second stop groove. The second tightening part 6 also includes a fifth oil cylinder 605. The output rod of the fifth oil cylinder 605 is provided with an inclined surface, which cooperates with the second stop groove to lock the third rod 603.

[0069] Specifically, when the second trigger plate 7 contacts the second contact point 701, the second oil cylinder 601 is stopped, and then the fifth oil cylinder 605 is started to lock the third rod 603 to prevent the third rod 603 from shaking during the processing, thereby reducing the processing accuracy.

[0070] The process of locking the third rod 603 is performed after the pressing process is completed.

[0071] Further, such as Fig. 20 As shown, a sixth oil cylinder 301 is installed at one end of the support block 3 for driving the support block 3 to move. When placed, the extended length of the support block 3 can be longer. After clamping, the support block 3 can be driven to retract, thereby not affecting the processing process.

[0072] Further, such as Fig.21 As shown, the single positioning fixture also includes an auxiliary support portion 10, which is used to auxiliary support and tighten the second extension portion 102 on the special-shaped workpiece 1; the auxiliary support portion 10 includes: an auxiliary rod 1001, which is provided with a driving groove, and an auxiliary block 1002 is installed at one end of the auxiliary rod 1001; a seventh oil cylinder 1003, and the output rod of the seventh oil cylinder 1003 is provided with an inclined surface, which is used to cooperate with the driving groove to drive the auxiliary rod 1001 to move.

[0073] The auxiliary rod 1001 is driven by the output rod of the seventh oil cylinder 1003 in cooperation with the driving groove, so that the auxiliary rod 1001 moves toward the second extension portion 102 on the special-shaped workpiece 1, and the auxiliary rod 1001 drives the auxiliary block 1002 to auxiliary support and tighten the second extension portion 102.

[0074] The auxiliary support part 10 is activated after the pressing process is completed.

[0075] A multi-directional clamping tool for a special-shaped workpiece 1, the working principle is as follows:

[0076] Place the irregular workpiece 1 on the placement table 2, and make the first extension portion 101 contact the support block 3 and the third positioning block 203 respectively, and make the second extension portion 102 contact the first positioning block 201 and the second positioning block 202, so as to pre-place the irregular workpiece 1;

[0077] The first oil cylinder 401 is controlled, and the output rod of the first oil cylinder 401 drives the first rod 402 to move, and the first rod 402 drives the guide block 406 to move, thereby moving the driven plate 403, driving another guide block 406 to move, so that the second rod 404 is driven, and the movement of the second rod 404 drives the first clamping block 405 to clamp and lock the second extension portion 102 of the workpiece;

[0078] The driven plate 403 moves synchronously with the first trigger plate 5. When the first trigger plate 5 contacts the first contact point 501, the first oil cylinder 401 is stopped. Then the fourth oil cylinder 407 is started to cooperate with the first stop groove on the second rod 404 to lock the second rod 404 to avoid shaking during the subsequent processing.

[0079] The output rod of the second oil cylinder 601 drives the connecting plate 602 to move, and the connecting rod drives the third rod 603 to move, and then drives the second clamping block 604 to move, so as to clamp and lock the first extension portion 101 of the workpiece. In this process, the movement direction of the second clamping portion 6 is to move toward the first positioning block 201.

[0080] The movement of the connecting plate 602 synchronously drives the second trigger plate 7. When the second trigger plate 7 contacts the second contact point 701, the second oil cylinder 601 is stopped. Then the fifth oil cylinder 605 is started to cooperate with the second stop groove to lock the third rod 603, thus preventing shaking during the subsequent processing.

[0081] When the driven plate 403 and the connecting plate 602 have finished moving, the first trigger plate 5 and the second trigger plate 7 are in contact with the first contact point 501 and the second contact point 701 respectively, the third oil cylinder 802 is started, driving the driving block 805 to move, and then driving the deflection block 804 to move, and the movement of the deflection block 804 drives the pressing block 806 to press and lock the workpiece;

[0082] The movement of the deflection block 804 synchronously drives the expansion plate 812, and the movement of the expansion plate 812 drives the spherical member 814 on the driving rod 813 to move, and then drives the driving rod 813 to move, and the driving rod 813 drives the driven rod 815 to move, and the movement of the driven rod 815 drives the tensioning block 818 to move, and the groove on the workpiece is pressed outward and locked;

[0083] The movement of the driving block 805 synchronously drives the third trigger plate 9 to move. When the third trigger plate 9 contacts the third contact point 901, the third oil cylinder 802 is stopped. At this time, the workpiece is clamped and cutting can be carried out.

Claims

1. A multi-directional clamping fixture for special-shaped workpieces, characterized in that: It includes positioning fixtures distributed at four corners, which are used to clamp a special-shaped workpiece, wherein the special-shaped workpiece includes a first extension portion and two second extension portions extending at different angles, the first extension portion and the second extension portion are arranged vertically, and the special-shaped workpiece is concave in a top view; A single positioning tool includes: A placing table, on which a first positioning block, a second positioning block and a third positioning block are installed, for placing special-shaped workpieces; A support block, used to support the first extension portion of the special-shaped workpiece; The first abutting portion comprises a first oil cylinder, a first rod, a driven plate, and a second rod, wherein a first abutting block is mounted on the second rod for abutting and locking the second extension portion on the special-shaped workpiece; A first trigger plate and a first contact matched therewith, wherein the first trigger plate is mounted on the driven plate and is used to match the first abutting portion; The second abutting portion comprises a second oil cylinder, a connecting plate and a third rod, wherein a second abutting block is mounted on the third rod for abutting and locking the first extension portion on the special-shaped workpiece; A second trigger plate and a second contact matched therewith, wherein the second trigger plate is mounted on the connecting plate and is used to match the second abutting portion; The clamping part includes a mounting frame, a third oil cylinder, and a deflection block, wherein the third oil cylinder is mounted with a driving block, the driving block is arranged on the deflection block, the deflection block is rotatably arranged on the mounting frame, and three clamping blocks are mounted on one end of the deflection block for clamping and locking the first extension part and the second extension part on the special-shaped workpiece; A third trigger plate and a third contact matched therewith, wherein the third trigger plate is mounted on the driving block and is used to match the pressing portion; During operation, the first oil cylinder works first, and then the second oil cylinder works after the first oil cylinder finishes working. The first clamping block and the second clamping block are driven successively to clamp the second extension part and the first extension part respectively. The first trigger plate and the second trigger plate follow the movement, and respectively cooperate with the first contact and the second contact for monitoring. When the first trigger plate contacts the first contact, the first oil cylinder stops. After the second trigger plate contacts the second contact, the second oil cylinder stops. Then the clamping part works, and the clamping block is driven by the third oil cylinder to clamp the first extension part and the second extension part. The third trigger plate follows the movement. When the third trigger plate contacts the third contact, the third oil cylinder is stopped.

2. The multi-directional clamping fixture for special-shaped workpieces according to claim 1, characterized in that: The clamping portion further comprises a tensioning assembly for tightening the first extension portion on the special-shaped workpiece; The tensioning assembly comprises: The expansion plate is mounted on the deflection block and moves with the deflection block; A driving rod, on which a spherical piece is mounted, which cooperates with the expansion plate; A driven rod, one end of which is an inclined surface, is driven to move by the driving rod, a baffle is installed on the driven rod, a spring is installed on the baffle, and the spring is used to reset the driven rod; A plurality of tensioning blocks are symmetrically distributed along the axis of the driven rod, one end of the tensioning block is an inclined surface, and is driven to move by the driven rod, and a guide slot is provided on the tensioning block; The guide rod is slidably matched with the guide slide groove to support and limit the tensioning block.

3. The multi-directional clamping fixture for special-shaped workpieces according to claim 1, characterized in that: The top ends of the output rod of the first oil cylinder are inclined surfaces, and positioning grooves are provided on the inclined surfaces; One end of the first rod is an inclined surface, on which a positioning block is mounted, and the positioning block is slidably arranged in the positioning slot to match the output rod; A first guide groove is provided on the other end of the first rod; The second rod is provided with a first stop groove, and one end of the second rod is provided with a second guide groove; Guide blocks are installed at both ends of the driven plate, and the two guide blocks are slidably arranged in the first guide groove and the second guide groove respectively.

4. The multi-directional clamping fixture for special-shaped workpieces according to claim 3, characterized in that: The first abutting portion further comprises a fourth oil cylinder, and an output rod of the fourth oil cylinder is provided with an inclined surface, which cooperates with the first stop groove to lock the second rod.

5. The multi-directional clamping fixture for special-shaped workpieces according to claim 1, characterized in that: The connecting plate is installed on the output rod of the second oil cylinder. The connecting plate is connected to the third rod. The third rod is provided with a second stop groove.

6. The multi-directional clamping fixture for special-shaped workpieces according to claim 5, characterized in that: The second abutting portion further comprises a fifth oil cylinder, and an output rod of the fifth oil cylinder is provided with an inclined surface, which cooperates with the second stop groove to lock the third rod.

7. The multi-directional clamping fixture for special-shaped workpieces according to claim 2, characterized in that: The pressing portion further comprises: A slide rail, wherein a slide block is slidably arranged inside, wherein one end of the slide block is an inclined surface, and a connecting groove is arranged on the inclined surface; A connecting block, one end of which is an inclined surface, for cooperating with the sliding block, wherein the connecting block is connected to the third oil cylinder; An eighth oil cylinder, wherein the output rod of the eighth oil cylinder is connected to the sliding block, and is used to drive the sliding block to lock the third oil cylinder.

8. The multi-directional clamping fixture for special-shaped workpieces according to claim 1, characterized in that: A sixth oil cylinder is installed at one end of the support block for driving the support block to move.

9. The multi-directional clamping fixture for special-shaped workpieces according to claim 1, characterized in that: The special-shaped workpiece is provided with grooves distributed on the first extension part and the second extension part; The number of the first positioning block and the second positioning block are both two, which are symmetrically distributed on the placement table. The first positioning block is used to position the side end of the second extension portion on the special-shaped workpiece, and the second positioning block is used to support the bottom end of the special-shaped workpiece; The number of the third positioning block is single, and the groove on the special-shaped workpiece is supported and positioned, mainly supporting the midpoint position of the groove distributed on the first extension part.

10. The multi-directional clamping fixture for special-shaped workpieces according to claim 1, characterized in that: The single positioning fixture also includes an auxiliary support portion, which is used to provide auxiliary support and tightening to the second extension portion on the special-shaped workpiece; The auxiliary support portion comprises: An auxiliary rod, on which a driving groove is formed, and an auxiliary block is mounted on one end of the auxiliary rod; The seventh oil cylinder, the output rod of the seventh oil cylinder is provided with an inclined surface, which is used to cooperate with the driving groove to drive the auxiliary rod to move.

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