High-speed gantry machining center large workpiece anti-rotation rapid positioning clamp

Abstract

The utility model relates to a high -speed gantry machining center large -scale workpiece anti -rotation quick positioning fixture belongs to high -speed gantry machining technical field. In order to solve the problem that traditional fixture poor adaptability, cannot satisfy the processing demand of large -scale workpiece of many length, the stability is influenced by the unreasonable support position, the top of the fixed support of the utility model is equipped with multiple T -type sliding slot, and at least four moving mechanisms slide in it, drive clamping assembly and support assembly to move along the sliding slot and lock tightly to adapt to different length workpiece. Clamping assembly drives the jaw to clamp workpiece through rotating block, and there is angle adjusting mechanism. Support assembly adjusts the position of arc support plate through two -way screw rod, and can change different size arc support plate to adapt to workpiece height and size. The utility model improves the universality, processing precision, and the operation is simple, prolongs the service life, and reduces the cost and maintenance difficulty.

Description

Technical Field

[0001] This utility model relates to the field of high-speed gantry machining technology, and in particular to a fast positioning fixture for large workpieces in a high-speed gantry machining center to prevent rotation. Background Technology

[0002] In the machining process of a high-speed gantry machining center, the positioning and clamping of large workpieces is a critical and challenging task. Due to their large size and weight, large workpieces are prone to rotation or displacement during machining due to their own weight and cutting forces, which can affect machining accuracy and product quality.

[0003] Traditional fixtures have several shortcomings when positioning and clamping large workpieces. Some fixtures can only fix the workpiece at a specific position, making it difficult to flexibly adjust the clamping and support positions according to the workpiece length. This results in poor adaptability and an inability to meet the processing needs of large workpieces of various lengths. Some fixtures have fixed clamping and support points, which either fail to clamp effectively or result in unreasonable support positions when processing workpieces with significant length variations, affecting workpiece stability. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a fast positioning fixture for large workpieces in a high-speed gantry machining center to prevent rotation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A fast positioning fixture for preventing rotation of large workpieces in a high-speed gantry machining center includes a fixed bracket, the top of which is provided with multiple T-shaped grooves; At least four moving mechanisms are slidably connected within the T-shaped groove; At least two clamping assemblies are fixedly mounted on the top of the two moving mechanisms located on both sides, for clamping both ends of the workpiece; At least two support components are fixedly installed on the top of the two moving mechanisms located in the middle, for supporting the middle part of the workpiece. The moving mechanisms can drive the clamping components and the support components to move and lock along the T-shaped slide to adapt to workpieces of different lengths.

[0006] In one possible design, the moving mechanism includes: A movable plate, with a T-shaped slider fixedly installed at its bottom, the T-shaped slider slidingly engaging with the T-shaped groove; A pad is placed on top of the movable plate; The limit screw passes through the through-slot thread of the moving plate and through the threaded hole of the T-shaped slider, and finally connects with the threaded hole at the bottom of the T-shaped slide.

[0007] In one possible design, the clamping assembly includes: A support plate is fixedly connected to the top of the moving mechanism; A first outer shell and a second outer shell, wherein the first outer shell is rotatably connected to the supporting vertical plate via a pivot, and the second outer shell is detachably connected to the first outer shell; Multiple grippers are slidably disposed at the end of the second housing; A drive mechanism, disposed within the first housing and the second housing, is used to drive the multiple grippers to move synchronously closer or further away to clamp or release the workpiece.

[0008] In one possible design, the drive mechanism includes: A rotating block that rotates through the first outer shell and the second outer shell; A bevel gear is fixed to the end of the rotating block; The gear disk is rotatably connected to the inner wall of the second housing and meshes with the bevel gear; The Archimedean spiral is fixed to the side of the gear disk; The movable block is slidably connected to the strip groove opened at the end of the second housing. One end of the block is detachably connected to the gripper, and the other side has a mating part that engages with the Archimedes spiral.

[0009] In one possible design, the clamping assembly further includes an angle adjustment mechanism, the angle adjustment mechanism comprising: A worm gear is fixedly sleeved on the outer wall of the shaft connected to the first housing; The worm gear is rotatably connected to the fixed side plate and meshes with the worm wheel; the fixed side plate is fixed to the support vertical plate. The first handwheel is fixedly connected to one end of the worm gear.

[0010] In one possible design, the angle adjustment mechanism further includes a dial fixedly mounted on the end of the rotating shaft, and a protective cover fixedly mounted on one side of the support vertical plate to protect the worm gear and the worm.

[0011] In one possible design, the support component includes: A rectangular box is fixedly connected to the top of the moving mechanism; Two sliding vertical plates are slidably connected to two rectangular cavities opened at the top of the rectangular box; A two-way lead screw rotates through the rectangular box and is threaded through the two sliding vertical plates; The second handwheel is fixedly installed at one end of the bidirectional lead screw; A support block is detachably connected to the top of the sliding vertical plate; An arc-shaped support plate is fixedly installed on the top of the support block. Rotating the second handwheel can drive the bidirectional lead screw to move the two sliding vertical plates closer or further apart, thereby adjusting the distance between the two arc-shaped support plates.

[0012] In one possible design, the top of the sliding vertical plate can be fitted with support blocks and arc-shaped support plates of different sizes to accommodate the height and size of the workpiece.

[0013] In this application, during use, two clamping mechanisms can clamp the two ends of the large workpiece, two supporting mechanisms can support the middle position of the large workpiece, and multiple moving mechanisms can adjust the positions of the supporting mechanisms and clamping mechanisms, thereby adapting to large workpieces of various lengths. After the moving plate is adjusted to the position, multiple limit screws can be used to lock the moving plate to the top of the fixed bracket, thereby ensuring the stability of the position of the multiple moving plates. One end of the workpiece is placed between multiple jaws. By rotating the rotating block, the rotating block drives the bevel gear to rotate, the bevel gear drives the gear disk to rotate, the gear disk drives the Archimedean spiral to rotate, the Archimedean spiral engages with the mating parts, and can also drive multiple moving blocks to move closer to each other. The moving blocks drive the jaws to move closer to each other, thereby clamping the workpiece. Furthermore, it can support the workpiece at the corresponding position to ensure the stability of large workpieces. By rotating the second handwheel, the second handwheel drives the double-acting screw to rotate, and the double-acting screw drives the sliding vertical plate to move, thereby adjusting the distance between the two support blocks and thus adjusting the position of the arc-shaped support plate. Moreover, by installing arc-shaped support plates of different sizes on the top of the sliding vertical plate, it is convenient to adapt to the height and size of the workpiece.

[0014] Beneficial effects: The multiple moving mechanisms of this fixture can slide within the T-shaped grooves on the top of the fixed bracket, allowing for flexible adjustment of the positions of the clamping and supporting components according to the different lengths of large workpieces. This ensures that suitable clamping and support points can be found regardless of the workpiece length, thus adapting to large workpieces of various lengths and improving the fixture's versatility and range of applications.

[0015] After the movable plates are adjusted into position, they are locked to the top of the fixed bracket using multiple limit screws, effectively ensuring the stability of the multiple movable plates. This ensures that the clamping and support components do not shift during operation, providing a stable positioning environment for large workpieces, avoiding workpiece rotation or displacement caused by movement of the clamping components, and improving machining accuracy.

[0016] When clamping a workpiece, one end of the workpiece is placed between multiple jaws. By rotating the rotating block, the bevel gear rotates, which in turn rotates the gear disc and the Archimedean spiral. The Archimedean spiral, in conjunction with the mating parts, drives multiple moving blocks to move closer together, thereby bringing the jaws closer together and clamping the workpiece. This clamping method is simple to operate; simply rotating the rotating block completes the clamping action, greatly improving clamping efficiency and saving processing time.

[0017] By rotating the second handwheel, the double-acting lead screw is driven to rotate, thereby moving the sliding vertical plate. This allows for easy adjustment of the distance between the two support blocks, thus adjusting the position of the arc-shaped support plate. Furthermore, arc-shaped support plates of different sizes can be installed on the top of the sliding vertical plate to accommodate the height and size of the workpiece. This flexible support adjustment method provides precise and reliable support for large workpieces, ensuring their stability during processing.

[0018] The components of this fixture are tightly connected and have a rational structure. The use of worm gear and gear drives ensures smooth and accurate transmission. Meanwhile, the protective cover protects the worm gear and other components, reducing external interference and wear, extending the fixture's service life, and lowering operating costs and maintenance difficulty. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of a high-speed gantry machining center large workpiece anti-rotation rapid positioning fixture proposed in this utility model; Figure 2 This is an exploded view of the moving mechanism in a high-speed gantry machining center large workpiece anti-rotation rapid positioning fixture proposed in this utility model; Figure 3 This is a three-dimensional structural diagram of the clamping mechanism in a high-speed gantry machining center's large workpiece anti-rotation rapid positioning fixture proposed in this utility model; Figure 4 This is a three-dimensional structural diagram of the clamping mechanism in a high-speed gantry machining center's large workpiece anti-rotation rapid positioning fixture, taken from a second perspective, according to the present invention. Figure 5 This is an exploded view of the clamping mechanism in a high-speed gantry machining center's large workpiece anti-rotation rapid positioning fixture. Figure 6 This is an exploded view of the support mechanism in a high-speed gantry machining center's large workpiece anti-rotation rapid positioning fixture, as proposed in this utility model.

[0020] In the diagram: 1. Fixed bracket; 2. T-shaped slide; 3. Moving plate; 4. Rectangular box; 5. Supporting vertical plate; 6. Pad; 7. Limiting screw; 8. T-shaped slider; 9. First outer shell; 10. Gripper; 11. Moving block; 12. Mating part; 13. First handwheel; 14. Fixed side plate; 15. Worm gear; 16. Worm wheel; 17. Protective cover; 18. Second outer shell; 19. Dial; 20. Rotating block; 21. Bevel gear; 22. Gear disk; 23. Archimedean spiral; 24. Strip groove; 25. Arc-shaped support plate; 26. Support block; 27. Rectangular cavity; 28. Sliding vertical plate; 29. ​​Bidirectional lead screw; 30. Second handwheel. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] In one embodiment: Refer to Figure 1-6 A clamp, the specific implementation of which is as follows: The fixture mainly consists of a fixed bracket 1, a moving mechanism, a clamping assembly, and a support assembly. The fixed bracket 1 is made of high-strength alloy steel, possessing sufficient rigidity and stability to withstand the weight of large workpieces and various forces during processing. Multiple T-shaped grooves 2 are provided on its top. The T-shaped grooves 2 have high precision, ensuring smooth sliding of the moving mechanism within them without any wobbling.

[0023] There are four moving mechanisms, slidably connected inside the T-shaped slide groove 2. Each moving mechanism includes a moving plate 3, with multiple T-shaped sliders 8 fixedly installed at the bottom of the moving plate 3. The T-shaped sliders 8 fit tightly with the T-shaped slide groove 2, ensuring that the moving plate 3 can move stably along the T-shaped slide groove 2. Multiple pads 6 are placed on the top of the moving plate 3. The T-shaped sliders 8 have threaded through holes. The screw of the limit screw passes through the through groove of the moving plate 3, through the threaded through hole of the T-shaped slider 8, and finally connects with the threaded hole at the bottom of the T-shaped slide groove 2. The end of the limit screw 7 presses against the moving plate 3. The interior of the T-shaped slide groove 2 has multiple threaded holes. When the moving plate 3 is adjusted to the appropriate position, the limit screw 7 is tightened and connected to the threaded hole, thereby locking the moving plate 3 to the top of the fixed bracket 1, ensuring the stability of the moving plate 3.

[0024] Furthermore, such as Figure 2 As shown, a pad 6 is provided between the end of the limiting screw 7 and the moving plate 3. The pad 6 can effectively disperse the pressure applied by the limiting screw 7 and enhance the reliability of locking. For example, the pad 6 can be an elastic washer.

[0025] Furthermore, such as Figure 2As shown, the movable plate 3 has four through slots located on opposite sides of the movable plate 3. Each through slot is provided with a limiting screw 7, so that the movable plate 3 can be firmly fixed in four directions. For example, the through slot is provided through the thickness direction of the movable plate 3, and the through slot extends through to the adjacent side edge of the movable plate 3 to form an opening, which facilitates the installation and removal of the limiting screw 7.

[0026] In use, the positions of the support mechanism and clamping mechanism can be adjusted via at least four moving mechanisms to accommodate large workpieces of various lengths. The clamping assemblies at the top of the two moving mechanisms on either side are adjusted to a suitable position to clamp the ends of the workpiece; the support assemblies at the top of the two moving mechanisms in the middle are adjusted to a suitable position to support the middle of the workpiece.

[0027] The clamping assembly is mounted on the movable plate 3. Each clamping assembly includes a supporting vertical plate 5, which is fixedly connected to the movable plate 3. A rotating shaft rotatably passes through one side of the supporting vertical plate 5. A worm gear 16 is fixedly sleeved on the outer wall of the rotating shaft. A scale 19 is fixedly mounted on one end of the rotating shaft, which helps the operator to precisely control the rotation angle of the shaft. A first outer shell 9 is fixedly mounted on one end of the scale 19. A second outer shell 18 is detachably connected to one end of the first outer shell 9 by screws. This detachable connection method facilitates the maintenance and replacement of internal parts. Two symmetrically arranged fixed side plates 14 are fixedly mounted on one side of the supporting vertical plate 5. A worm gear 15 is rotatably connected inside the fixed side plate 14, and the worm gear 15 meshes with the worm gear 16. A protective cover 17 is also fixedly mounted on one side of the supporting vertical plate 5. The protective cover 17 is made of transparent plastic, which can protect the worm gear 16 from dust and debris entering and affecting the transmission, and also allows the operator to easily observe the internal transmission. One of the fixed side plates 14 has a first handwheel 13 that rotates through one end, and the first handwheel 13 is fixedly connected to one end of the worm gear 15.

[0028] A gear disk 22 is rotatably connected to the inner wall of the second outer shell 18. The gear disk 22 has an Archimedean spiral 23 on the side facing the slotted groove 24. Multiple rotating blocks 20 rotatably pass through the interior of both the first outer shell 9 and the second outer shell 18. A bevel gear 21 is fixedly mounted at one end of each rotating block 20, meshing with the gear disk 22. Multiple slotted grooves 24 are formed at one end of the second outer shell 18. A moving block 11 is slidably connected inside each slotted groove 24. One side of the moving block 11 has a mating part 12 that engages with the slotted groove 24 and the Archimedean spiral 23. A clamping jaw 10 is detachably connected to one end of the moving block 11 via screws. The clamping jaw 10 can be made of wear-resistant metal to ensure its service life.

[0029] Specifically, the mating part 12 can be a pin or other driven mating part. For example, in this embodiment, it is a plurality of arc-shaped plates. The arc-shaped plates are adapted to the spiral groove of the Archimedean spiral 23. The arc-shaped plates are embedded in the spiral groove of the Archimedean spiral 23. When the Archimedean spiral 23 rotates, the radial change acts on the arc-shaped plates, thereby driving the gripper 10 to reciprocate along the strip groove 24.

[0030] Specifically, such as Figure 4 , Figure 5 As shown, multiple rotating blocks 20 are rotatably passed through the first outer shell 9 and the second outer shell 18. In this embodiment, four mounting cavities are formed at the first outer shell 9 and the second outer shell 18. Each mounting cavity is provided with a rotating block 20. The mounting cavity is a circular cavity with a circular through hole at the bottom. The rotating block 20 is a cylindrical structure with a coaxial circular boss at the top. The circular boss is embedded in the mounting cavity. The end face of the circular boss is provided with a hexagonal screw hole. The other side of the rotating block 20 is fixedly connected to the bevel gear 21, and this side is in contact with the side wall of the gear disk 22. The axis of the bevel gear 21 is perpendicular to the axis of the gear disk 22, and the bevel gear 21 meshes with the gear disk 22.

[0031] Furthermore, the shape of the gripper 10 can be customized to be arc-shaped, V-shaped, or flat according to the shape of the workpiece, so as to adapt to the clamping requirements of workpieces with different cross-sectional shapes, ensuring stable clamping and no damage to the workpiece surface.

[0032] The number of slots 24 can be set to three or four according to actual clamping requirements, and they are evenly distributed on the end face of the second housing 18 to achieve multi-point synchronous clamping and improve clamping stability and centering. For example, in this embodiment, three slots 24 are provided, and the three slots 24 are evenly distributed at 120°, which, together with the three grippers 10, achieve equidistant clamping of the circular workpiece and ensure balanced force.

[0033] One end of the workpiece is placed between multiple jaws 10. By rotating the rotating block 20, the rotating block 20 drives the bevel gear 21 to rotate, the bevel gear 21 drives the gear disk 22 to rotate, and the gear disk 22 drives the Archimedean spiral 23 to rotate. The Archimedean spiral 23 cooperates with the mating part 12, causing multiple moving blocks 11 to move closer to each other. The moving blocks 11 drive the jaws 10 to move closer to each other, thereby clamping the workpiece. By rotating the worm gear 15 through the first handwheel 13, the worm gear 15 drives the worm wheel 16 to rotate, and the worm wheel 16 drives the rotating shaft to rotate, thereby driving the scale 19, the first outer shell 9, and the second outer shell 18 to rotate, realizing the adjustment of the angle of the jaws 10 to better adapt to workpieces of different shapes.

[0034] The support components are mounted on the movable plate 3. Each support component includes a rectangular box 4, which is fixedly connected to the movable plate 3. The top of the rectangular box 4 has two symmetrically arranged rectangular cavities 27, and sliding vertical plates 28 are slidably connected inside the rectangular cavities 27. A bidirectional lead screw 29 rotates through the rectangular box 4, threaded through the two sliding vertical plates 28. A support block 26 is detachably connected to the top of the sliding vertical plates 28 by screws. An arc-shaped support plate 25 is fixedly mounted on the top of the support block 26. The arc-shaped support plate 25 can be made of a rubber material with a certain degree of flexibility to better conform to the workpiece surface.

[0035] Specifically, the two-way lead screw 29 has threads with opposite directions at both ends, which are threaded to the two sliding vertical plates 28 respectively. When the second handwheel 30 installed on one side of the rectangular box 4 is rotated, the second handwheel 30 drives the two-way lead screw 29 to rotate, thereby driving the two sliding vertical plates 28 to move synchronously towards or away from each other, thereby adjusting the distance between the two arc-shaped support plates 25 to adapt to the support requirements of workpieces with different diameters.

[0036] The bidirectional lead screw 29 is connected to the rectangular box 4 via bearings to ensure smooth rotation and axial fixation, preventing radial movement.

[0037] The two sides of the sliding vertical plate 28 are fitted against the inner wall of the rectangular cavity 27 to ensure smooth movement without shaking.

[0038] In practical use, first adjust the position of the moving plate 3 on the guide rail according to the length of the workpiece, so that the support assembly is located at an appropriate position below the workpiece, such as at one-third and two-thirds of the workpiece length, to provide the best support effect. Then, adjust the bidirectional lead screw 29 by the second handwheel 30 so that the distance between the two arc-shaped support plates 25 is greater than the diameter of the workpiece. After initially clamping the workpiece between the jaws 10, rotate the second handwheel 30 to move the two arc-shaped support plates 25 inward synchronously until they fit against the outer circular surface of the bottom of the workpiece, providing stable support. Then, fine-tune the first handwheel 13 to precisely correct the jaw angle through the worm gear transmission, ensuring that the clamping force is evenly distributed on the workpiece surface and preventing deformation or slippage.

[0039] Furthermore, it can support the workpiece at appropriate positions, ensuring the stability of large workpieces. By rotating the second handwheel 30, the second handwheel 30 drives the double-acting lead screw 29 to rotate, which in turn moves the sliding vertical plate 28, thereby adjusting the distance between the two support blocks 26 and thus adjusting the position of the arc-shaped support plate 25. Moreover, by installing arc-shaped support plates 25 of different sizes on the top of the sliding vertical plate 28, it is convenient to adapt to the height and size of the workpiece.

[0040] Through the aforementioned structure and working principle, this fixture can quickly position, flexibly adjust, and stably and reliably clamp and support large workpieces. It effectively solves the problems of poor adaptability, inconvenient operation, inflexible support adjustment, and easy wear and loosening of parts that exist in traditional fixtures, thereby improving processing accuracy and efficiency, and reducing usage costs and maintenance difficulties.

[0041] This application can be used in the field of high-speed gantry machining, or in other fields applicable to this application.

[0042] In another embodiment: Reference Figure 1-6 A high-speed gantry machining center for preventing large workpieces from rotating and for quick positioning is used in the field of high-speed gantry machining. A second handwheel 30 is fixedly installed at one end of the bidirectional lead screw 29.

[0043] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A rapid positioning fixture for large workpieces in a high-speed gantry machining center to prevent rotation, characterized in that, include: Fixed bracket (1), the top of the fixed bracket (1) is provided with multiple T-shaped grooves (2); At least four moving mechanisms are slidably connected within the T-shaped groove (2); At least two clamping assemblies are fixedly mounted on the top of the two moving mechanisms located on both sides, for clamping both ends of the workpiece; At least two support components are fixedly installed on the top of the two moving mechanisms located in the middle, for supporting the middle part of the workpiece. The moving mechanism can drive the clamping component and the support component to move and lock along the T-shaped slide (2) to adapt to workpieces of different lengths.

2. The high-speed gantry machining center large workpiece anti-rotation rapid positioning fixture according to claim 1, characterized in that, The moving mechanism includes: The movable plate (3) has a T-shaped slider (8) fixedly installed at its bottom, and the T-shaped slider (8) slides in cooperation with the T-shaped groove (2); A pad (6) is placed on top of the movable plate (3); The limit screw (7) passes through the through groove of the moving plate (3) and through the threaded hole of the T-shaped slider (8), and finally connects with the threaded hole at the bottom of the T-shaped slide (2).

3. The high-speed gantry machining center large workpiece anti-rotation rapid positioning fixture according to claim 1, characterized in that, The clamping assembly includes: A support vertical plate (5) is fixedly connected to the top of the moving mechanism; A first outer shell (9) and a second outer shell (18), wherein the first outer shell (9) is rotatably connected to the supporting vertical plate (5) via a rotating shaft, and the second outer shell (18) is detachably connected to the first outer shell (9); Multiple grippers (10) are slidably disposed at the end of the second housing (18); A drive mechanism, disposed within the first housing (9) and the second housing (18), is used to drive the plurality of grippers (10) to move closer or further away synchronously to clamp or release the workpiece.

4. The high-speed gantry machining center large workpiece anti-rotation rapid positioning fixture according to claim 3, characterized in that, The drive mechanism includes: Rotating block (20) rotates through the first outer shell (9) and the second outer shell (18); A bevel gear (21) is fixed to the end of the rotating block (20); The gear disk (22) is rotatably connected to the inner wall of the second housing (18) and meshes with the bevel gear (21); Archimedes spiral (23) is fixed to the side of the gear disk (22); The movable block (11) is slidably connected to the strip groove (24) opened at the end of the second housing (18). One end of the block is detachably connected to the gripper (10), and the other side has a mating part (12) that mates with the Archimedes spiral (23).

5. The high-speed gantry machining center large workpiece anti-rotation rapid positioning fixture according to claim 3, characterized in that, The clamping assembly further includes an angle adjustment mechanism, the angle adjustment mechanism comprising: The worm gear (16) is fixedly sleeved on the outer wall of the shaft that connects to the first housing (9); The worm (15) is rotatably connected to the fixed side plate (14) and meshes with the worm wheel (16). The fixed side plate (14) is fixed to the support vertical plate (5). The first handwheel (13) is fixedly connected to one end of the worm (15).

6. The high-speed gantry machining center large workpiece anti-rotation rapid positioning fixture according to claim 5, characterized in that: The angle adjustment mechanism also includes a dial (19), which is fixedly installed at the end of the rotating shaft. A protective cover (17) is fixedly installed on one side of the support vertical plate (5) to protect the worm gear (16) and the worm (15).

7. The high-speed gantry machining center large workpiece anti-rotation rapid positioning fixture according to claim 1, characterized in that, The support components include: A rectangular box (4) is fixedly connected to the top of the moving mechanism; Two sliding vertical plates (28) are slidably connected to two rectangular cavities (27) opened at the top of the rectangular box (4); A two-way lead screw (29) rotates through the rectangular box (4) and threaded through the two sliding vertical plates (28); The second handwheel (30) is fixedly installed at one end of the bidirectional lead screw (29); The support block (26) is detachably connected to the top of the sliding vertical plate (28); An arc-shaped support plate (25) is fixedly installed on the top of the support block (26). Rotating the second handwheel (30) can drive the bidirectional screw (29) to move the two sliding vertical plates (28) closer or further apart, so as to adjust the distance between the two arc-shaped support plates (25).

8. The high-speed gantry machining center large workpiece anti-rotation rapid positioning fixture according to claim 7, characterized in that: The top of the sliding vertical plate (28) can be fitted with support blocks (26) of different sizes and arc-shaped support plates (25) to accommodate the height and size of the workpiece.

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