Workpiece positioning and clamping device of numerical control machine tool

Abstract

The invention discloses a workpiece positioning and clamping device of a numerical control machine tool, and relates to the technical field of numerical control machine tools, the front end of a clamping seat is fixedly connected with the rear ends of two supporting frames, the outer wall of a rotating shaft is rotatably connected with the front end of an extension plate, and the rear end of a rotary adjusting shaft is rotatably connected with the front end of a distance adjusting plate; the side, away from the rotary adjusting shaft, of the rear end of the distance adjusting plate is fixedly connected with the front end of a clamping plate, the left end of the rotating shaft is fixedly connected with a synchronous shaft through a speed change linkage mechanism, and the outer wall of the synchronous shaft is slidably connected with the inner wall of a sliding control groove. The distance between the two clamping plates in an initial state can be adjusted through a rotary adjusting shaft and a distance adjusting plate, so that the clamping plates can clamp more objects with different sizes, scrap iron in a groove can be cleaned through a lower cleaning plate, movement of the lower cleaning plate can be linked with rotation of an extension plate, and the using effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of numerically controlled machine tools, in particular to a workpiece positioning and clamping device for numerically controlled machine tools. Background Art

[0002] In the fixture, the device used to prevent the workpiece from displacement or vibration during processing is called a clamping device. The clamping device has three functions: opening and closing the mold, ejecting the plastic part, and having enough force to keep the mold closed during injection to resist the three-dimensional pressure of the mold. The clamping force required per unit part projection area is usually 30-70MPa (about 2-5t in2). The pressure generated during filling and the force generated on the core due to part shrinkage may cause the parts to stick, making it difficult to separate the two half molds. The size of the initial mold opening force depends on the filling pressure and the geometric dimensions of the material part (depth and demolding slope), which is approximately equal to 10%-20% of the nominal clamping force;

[0003] The clamping parts of general CNC machine tool workpiece positioning and clamping devices are inconvenient to detach from the base, and the iron filings on the base cannot be cleaned synchronously when the clamping parts are unfolded and stored, resulting in poor linkage between the clamping parts and the cleaning mechanism. For this reason, we propose a CNC machine tool workpiece positioning and clamping device. Summary of the invention

[0004] The object of the present invention is to provide a workpiece positioning and clamping device for a numerically controlled machine tool.

[0005] In order to solve the problems raised in the above-mentioned background technology, the present invention provides the following technical solutions: a CNC machine tool workpiece positioning and clamping device, comprising a clamping device body, the clamping device body comprising a clamping seat and a clamping and cleaning mechanism connected to the upper end of the clamping seat, the clamping and cleaning mechanism comprising a support frame, an extension plate, a rotary adjustment shaft, a clamping plate, a synchronous shaft, a lower cleaning plate, a fan-shaped convex strip and a distance adjustment plate, the front end of the clamping seat is fixedly connected to the rear ends of the two support frames, the two support frames are rotatably connected to a rotating shaft on one side close to each other, the outer wall of the rotating shaft is rotatably connected to the front end of the extension plate, and the rear end of the extension plate The end is connected with the front end of the rotary adjustment shaft through a mobile driving mechanism, the rear end of the rotary adjustment shaft is rotatably connected with the front end of the distance adjusting plate, the rear end of the distance adjusting plate is fixedly connected to the front end of the clamping plate away from the rotary adjustment shaft, the left and right sides of the clamping plate are fixedly connected to the fan-shaped convex strips, the left end of the rotating shaft is fixedly connected to the synchronous shaft through a speed change linkage mechanism, the outer wall of the synchronous shaft is fixedly connected to the lower clearing plate, the upper end of the clamping seat is provided with a groove, and the left and right walls of the groove are provided with control slide grooves, the outer wall of the synchronous shaft is slidably connected to the inner wall of the control slide groove, and the rear end of the clamping plate is connected with a pulling and guiding mechanism.

[0006] As a further solution of the present invention: the mobile driving mechanism includes a driving plate, a threaded column, a rotating frame and a moving block, the front end left side of the extension plate is fixedly connected to the right end of the driving plate, the rear end of the driving plate is provided with a mobile bin, and the right wall of the mobile bin is rotatably connected to the right end of the threaded column.

[0007] As a further solution of the present invention: the left end of the threaded column extends to the outside of the driving plate, the left side of the outer wall of the threaded column is fixedly connected to one end of the rotating frame, the front end of the driving plate is fixedly connected to the limiting strip, and the upper wall of the limiting strip and the lower wall of the mobile bin are in the same horizontal plane.

[0008] As a further solution of the present invention: a threaded hole is penetrated through the left end of the moving block, the inner wall of the threaded hole is spirally connected to the outer wall of the threaded column, and the outer wall of the moving block is slidingly connected to the inner wall of the moving bin, and the rear end of the moving block is rotationally connected to the front end of the rotary adjustment shaft.

[0009] As a further solution of the present invention: the speed change linkage mechanism includes a speed change gear set, a speed receiving shaft, a mounting plate, a bidirectional screw, a bevel gear set, a driving plate and a lifting block. The left end of the left support frame is rotatably connected to the right end of the speed receiving shaft, the left end of the rotating shaft passes through the left support frame, and the speed receiving shaft and the rotating shaft are connected through the speed change gear set.

[0010] As a further solution of the present invention: the left sides of the front and rear ends of the clamping seat are fixedly connected to the mounting plate, the sides of the two mounting plates close to each other are rotatably connected to the two ends of the bidirectional screw rod, and the front end of the bidirectional screw rod passes through the front mounting plate, and the bidirectional screw rod is connected to the speed shaft through a bevel gear set.

[0011] As a further solution of the present invention: a screw hole is formed through the upper side of the front end of the two driving plates, the inner walls of the two screw holes are spirally connected to the outer wall of the same bidirectional screw, a lifting bin is formed at the right end of the two driving plates, the inner wall of the lifting bin is slidingly connected to the outer wall of the lifting block, and the right end of the lifting block is rotatably connected to the left end of the synchronous shaft.

[0012] As a further solution of the present invention: the pulling and pulling guide mechanism includes a guide frame, a pulling groove is provided at the rear end of the clamping plate, and the inner wall of the pulling groove is fixedly connected with a rubber protrusion, the inner wall of the pulling groove is slidably connected to the outer wall of the guide frame, and the rubber protrusion cooperates with the guide frame, a through hole is provided at the upper end of the extension plate, a screw is movably connected inside the through hole, the upper front side of the clamping seat is fixedly connected to the fixing plate, a screw hole is provided at the upper end of the fixing plate, and the screw hole is spirally connected to the screw.

[0013] By adopting the above technical solution, compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The present invention can adjust the working state of the clamping plate by rotating the clamping plate through the extension plate. At this time, the clamping plate can be folded up when not in use. The distance between the two clamping plates in the initial state can be adjusted by rotating the adjustment shaft and the distance adjustment plate, so that the clamping plate can clamp more objects of different sizes. The iron filings inside the groove can be cleaned by the lower cleaning plate, and the movement of the lower cleaning plate can be linked with the rotation of the extension plate, thereby improving the use effect, so that the clamping device needs stronger linkage;

[0015] 2. The present invention can increase the convenience of rotating the threaded column by means of the rotating frame. By means of the setting of the threaded column, when the threaded column rotates, the moving block can be moved synchronously. The moving block can cooperate with the moving bin, so that the moving block can be more stable when moving. The guide frame can further increase the stability of the clamping plate when moving. The angle position of the extension plate can be fixed by means of the cooperation between the screw and the screw hole, so that the clamping is more stable.

[0016] 3. The present invention can transmit the rotation force of the extension plate to the bidirectional screw through the speed change gear set and the bevel gear set, thereby increasing the speed of the bidirectional screw when rotating, and can make the movement of the lower clearing plate and the rotation of the extension plate mutually linked. Through the setting of the lifting bin, when the synchronous shaft moves, it can drive the lifting block to move inside the lifting bin, and can limit the position of the synchronous shaft, so as to better move along the control slide groove, so that the slight rotation of the extension plate can be amplified, so that the driving plate can be moved to the set position more easily. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall three-dimensional schematic diagram of an embodiment of the present invention;

[0018] Figure 2 This is a three-dimensional schematic diagram of a driving plate in an embodiment of the present invention;

[0019] Figure 3 It is a three-dimensional schematic diagram of a moving block in an embodiment of the present invention;

[0020] Figure 4 This is a three-dimensional schematic diagram of a distance adjustment plate in an embodiment of the present invention;

[0021] Figure 5 This is a three-dimensional schematic diagram of the lower cleaning plate in an embodiment of the present invention;

[0022] Figure 6 for Figure 5 The enlarged schematic diagram at A in the middle;

[0023] Figure 7 It is a three-dimensional schematic diagram of a driving plate in an embodiment of the present invention.

[0024] In the figure: 1. Clamping device body; 11. Clamping seat; 2. Clamping and cleaning mechanism; 21. Support frame; 22. Extension plate; 23. Rotary adjustment shaft; 24. Clamping plate; 25. Control slide groove; 26. Synchronous shaft; 27. Lower cleaning plate; 28. Fan-shaped convex strip; 29. ​​Distance adjustment plate; 3. Mobile driving mechanism; 31. Driving plate; 32. Mobile bin; 33. Threaded column; 34. Rotating frame; 35. Mobile block; 4. Speed ​​change linkage mechanism; 41. Speed ​​change gear set; 42. Speed ​​receiving shaft; 43. Mounting plate; 44. Screw; 45. Bevel gear set; 46. Driving plate; 47. Lifting bin; 48. Lifting block; 5. Limiting strip; 6. Pull-out guide mechanism; 61. Guide frame; 62. Pull-out groove; 7. Screw; 8. Screw hole. DETAILED DESCRIPTION

[0025] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0026] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] Please see attached Figure 1 -Attached Figure 7 The present invention discloses a workpiece positioning and clamping device for a numerically controlled machine tool, comprising a clamping device body 1, the clamping device body 1 comprising a clamping seat 11 and a clamping and cleaning mechanism 2 connected to the upper end of the clamping seat 11, the clamping and cleaning mechanism 2 comprising a support frame 21, an extension plate 22, a rotary adjustment shaft 23, a clamping plate 24, a synchronous shaft 26, a lower cleaning plate 27, a fan-shaped convex strip 28 and a distance adjustment plate 29, the front end of the clamping seat 11 is fixedly connected to the rear ends of the two support frames 21, the side of the two support frames 21 close to each other is rotatably connected with a rotating shaft, the outer wall of the rotating shaft is rotatably connected to the front end of the extension plate 22, and the rear end of the extension plate 22 is moved by a driving mechanism 3. It is connected to the front end of the rotary adjustment shaft 23, and the rear end of the rotary adjustment shaft 23 is rotatably connected to the front end of the distance adjusting plate 29. The rear end of the distance adjusting plate 29 is fixedly connected to the front end of the clamping plate 24 away from the rotary adjustment shaft 23. The left and right sides of the clamping plate 24 are fixedly connected to the fan-shaped convex strip 28. The left end of the rotating shaft is fixedly connected to the synchronous shaft 26 through the speed change linkage mechanism 4. The outer wall of the synchronous shaft 26 is fixedly connected to the lower clearing plate 27. A groove is provided at the upper end of the clamping seat 11, and the left and right walls of the groove are provided with a control slide groove 25. The outer wall of the synchronous shaft 26 is slidably connected to the inner wall of the control slide groove 25. The rear end of the clamping plate 24 is connected to a pulling guide mechanism 6.

[0028] In one embodiment of the present invention: the mobile driving mechanism 3 includes a driving plate 31, a threaded column 33, a rotating frame 34 and a moving block 35, the front end left side of the extension plate 22 is fixedly connected to the right end of the driving plate 31, and the rear end of the driving plate 31 is provided with a mobile bin 32, and the right wall of the mobile bin 32 is rotatably connected to the right end of the threaded column 33.

[0029] In one embodiment of the present invention: the left end of the threaded column 33 extends to the outside of the driving plate 31, the left side of the outer wall of the threaded column 33 is fixedly connected to one end of the rotating frame 34, the front end of the driving plate 31 is fixedly connected to the limiting strip 5, and the upper wall of the limiting strip 5 and the lower wall of the moving bin 32 are in the same horizontal plane.

[0030] In one embodiment of the present invention: a threaded hole is penetrated through the left end of the moving block 35, the inner wall of the threaded hole is spirally connected to the outer wall of the threaded column 33, and the outer wall of the moving block 35 is slidingly connected to the inner wall of the moving bin 32, and the rear end of the moving block 35 is rotationally connected to the front end of the rotary adjustment shaft 23.

[0031] In one embodiment of the present invention: the speed shift linkage mechanism 4 includes a speed shift gear set 41, a speed receiving shaft 42, a mounting plate 43, a bidirectional screw 44, a bevel gear set 45, a driving plate 46 and a lifting block 48, the left end of the left support frame 21 is rotatably connected to the right end of the speed receiving shaft 42, the left end of the rotating shaft passes through the left support frame 21, and the speed receiving shaft 42 is connected to the rotating shaft through the speed shift gear set 41.

[0032] In one embodiment of the present invention: the left sides of the front and rear ends of the clamping seat 11 are fixedly connected to the mounting plate 43, the sides of the two mounting plates 43 close to each other are rotatably connected to the two ends of the bidirectional screw rod 44, and the front end of the bidirectional screw rod 44 passes through the front mounting plate 43, and the bidirectional screw rod 44 is connected to the speed shaft 42 through a bevel gear set 45.

[0033] In one embodiment of the present invention: screw holes are formed through the upper sides of the front ends of the two driving plates 46, the inner walls of the two screw holes are spirally connected to the outer wall of the same bidirectional screw 44, and a lifting bin 47 is formed at the right ends of the two driving plates 46, the inner wall of the lifting bin 47 is slidingly connected to the outer wall of the lifting block 48, and the right end of the lifting block 48 is rotatably connected to the left end of the synchronization shaft 26.

[0034] In one embodiment of the present invention: the pulling and pulling guide mechanism 6 includes a guide frame 61, a pulling groove 62 is opened at the rear end of the clamping plate 24, and the inner wall of the pulling groove 62 is fixedly connected with a rubber protrusion, the inner wall of the pulling groove 62 is slidably connected to the outer wall of the guide frame 61, and the rubber protrusion cooperates with the guide frame 61, a through hole is opened at the upper end of the extension plate 22, and a screw 7 is movably connected inside the through hole, the upper front side of the clamping seat 11 is fixedly connected to the fixing plate 8, a screw hole is opened at the upper end of the fixing plate 8, and the screw hole is spirally connected to the screw 7.

[0035] Example 1, please refer to the attached Figure 1 -Attached Figure 7 The fan-shaped convex strip 28 is in the shape of a quarter circle, and the arc-shaped edge is directed downward, so that it can better apply force to the clamped object during clamping. At the same time, the fan-shaped convex strip 28 can also be replaced by a fan-shaped protrusion, a fan-shaped ball, etc.

[0036] Example 2, please refer to the attached Figure 1 -Attached Figure 7 A through hole can also be set at the rear side of the front end of the clamping plate 24, and the guide rod can be slidably installed into the through hole. At this time, when the clamping plate 24 moves, it will be guided by the guide rod, thereby increasing the stability of the clamping plate 24 when moving, and a slide groove can be opened at the upper end of the clamping seat 11, and then the guide frame 61 can be extended into the interior of the slide groove.

[0037] Example 3, please refer to the attached Figure 1 -Attached Figure 7 A groove can be provided at the lower end of the lower cleaning plate 27, wherein the interior of the groove is rotatably connected to a rotating shaft, and the outer surface of the rotating shaft is connected to an inclined cleaning plate, and the lower end of the cleaning plate is in contact with the bottom wall of the groove, and a spring and a limiting block are provided to limit the rotation direction of the cleaning plate, so that the synchronous shaft 26 can rotate when it moves upward and encounters iron filings, thereby breaking the contact between the cleaning plate and the bottom wall of the groove, improving the cleaning effect of the iron filings, and requiring stronger linkage of the clamping device.

[0038] Specifically, the working state of the clamping plate 24 can be adjusted by rotating the clamping plate 24 through the extension plate 22. At this time, the clamping plate 24 can be folded up when not in use, and the distance between the two clamping plates 24 in the initial state can be adjusted by rotating the adjustment shaft 23 and the distance adjustment plate 29, so that the clamping plate 24 can clamp more objects of different sizes, and the iron filings inside the groove can be cleaned through the lower cleaning plate 27, and the movement of the lower cleaning plate 27 can be linked with the rotation of the extension plate 22, thereby improving the use effect.

[0039] Specifically, the rotating frame 34 can increase the convenience of rotating the threaded column 33. Through the setting of the threaded column 33, when the threaded column 33 rotates, the moving block 35 can be moved synchronously. The moving block 35 can cooperate with the moving bin 32, so that the moving block 35 can be more stable when moving. The guide frame 61 can further increase the stability of the clamping plate 24 when moving. The cooperation of the screw 7 and the screw hole 8 can fix the angular position of the extension plate 22, so that it is more stable when clamping.

[0040] Specifically, the force of the rotation of the extension plate 22 can be transmitted to the bidirectional screw 44 through the speed change gear set 41 and the bevel gear set 45, thereby increasing the speed of the rotation of the bidirectional screw 44, and the movement of the lower clearing plate 27 and the rotation of the extension plate 22 can be linked to each other. Through the setting of the lifting bin 47, when the synchronous shaft 26 moves, it can drive the lifting block 48 to move inside the lifting bin 47, and can limit the position of the synchronous shaft 26, so as to better move along the control slide groove 25, so that the slight rotation of the extension plate 22 can be amplified, so that the driving plate 46 can be moved to the set position more easily.

[0041] Working principle:

[0042] First, place the object on the clamping seat 11, then rotate the extension plate 22, and use the extension plate 22 to drive the two clamping plates 24 to move, so that the screw 7 and the screw hole 8 cooperate with each other to fix the angular position of the extension plate 22, and then rotate the screw 7 to move the two clamping plates 24 to the left and right sides of the object. At this time, use the rotating frame 34 to rotate the threaded column 33, and the moving block 35 moves inside the moving bin 32 through the rotation of the threaded column 33. The movement of the moving block 35 can drive the clamping plate 24 to move. When the distance between the two clamping plates 24 is shorter than the clamping length of the object, the distance adjustment plate 29 can be controlled to rotate along the rotation adjustment shaft 23, so as to adjust the position of the clamping plate 24. At this time, the two clamping plates can be adjusted 24, so that objects of different lengths can be clamped. When the clamping plate 24 moves, it can synchronously drive the guide frame 61 to move along the upper wall of the clamping seat 11. At the same time, when the support frame 21 rotates, the speed change gear set 41 can be used to drive the speed receiving shaft 42 to rotate. At this time, the bevel gear set 45 is used to further increase the number of rotations of the two-way screw rod 44. When the two-way screw rod 44 rotates, it can drive the driving plate 46 to move. At this time, the synchronous shaft 26 and the lower cleaning plate 27 will be driven to move through the lifting block 48. When the synchronous shaft 26 moves, it will move along the control slide groove 25 and the lifting bin 47. At this time, the movement of the lower cleaning plate 27 can clean and collect the iron filings in the groove. At this point, the entire workflow ends.

[0043] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0045] It should be noted that the device structure and the drawings of the present invention mainly describe the principle of the present invention. In terms of the technology of the design principle, the settings of the power mechanism, power supply system and control system of the device are not fully described. On the premise that the technical personnel in this field understand the principle of the above invention, the details of the power mechanism, power supply system and control system can be clearly known. The control method of the application document is automatic control through a controller, and the control circuit of the controller can be realized by simple programming by the technical personnel in this field.

[0046] The standard parts used therein can all be purchased from the market and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the structures and principles of the components known to technical personnel in this field can be known by these technical personnel through technical manuals or through conventional experimental methods.

[0047] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations are made to these embodiments without departing from the principle and spirit of the present invention, and they still fall within the protection scope of the present invention.

Claims

1. A workpiece positioning and clamping device for a numerically controlled machine tool, comprising a clamping device body (1), characterized in that: The clamping device body (1) comprises a clamping seat (11) and a clamping and cleaning mechanism (2) connected to the upper end of the clamping seat (11); the clamping and cleaning mechanism (2) comprises a support frame (21), an extension plate (22), a rotary adjustment shaft (23), a clamping plate (24), a synchronous shaft (26), a lower cleaning plate (27), a fan-shaped convex strip (28) and a distance adjustment plate (29); the front end of the clamping seat (11) is fixedly connected to the rear ends of the two support frames (21); the two support frames (21) are rotatably connected to a rotating shaft on one side close to each other; the outer wall of the rotating shaft is rotatably connected to the front end of the extension plate (22); the rear end of the extension plate (22) is connected to the front end of the rotary adjustment shaft (23) via a mobile driving mechanism (3); The rear end of the rotary adjustment shaft (23) is rotatably connected to the front end of the distance adjustment plate (29); the rear end of the distance adjustment plate (29) is fixedly connected to the front end of the clamping plate (24) on the side away from the rotary adjustment shaft (23); the left and right sides of the clamping plate (24) are fixedly connected to the fan-shaped convex strip (28); the left end of the rotating shaft is fixedly connected to the synchronous shaft (26) through the speed change linkage mechanism (4); the outer wall of the synchronous shaft (26) is fixedly connected to the lower cleaning plate (27); the upper end of the clamping seat (11) is provided with a groove, and the left and right walls of the groove are provided with a control slide groove (25); the outer wall of the synchronous shaft (26) is slidably connected to the inner wall of the control slide groove (25); the rear end of the clamping plate (24) is connected to a pulling guide mechanism (6).

2. A workpiece positioning and clamping device for a CNC machine tool according to claim 1, characterized in that: The mobile drive mechanism (3) comprises a drive plate (31), a threaded column (33), a rotating frame (34) and a moving block (35); the left side of the front end of the extension plate (22) is fixedly connected to the right end of the drive plate (31); the rear end of the drive plate (31) is provided with a moving bin (32); the right wall of the moving bin (32) is rotatably connected to the right end of the threaded column (33).

3. A workpiece positioning and clamping device for a CNC machine tool according to claim 2, characterized in that: The left end of the threaded column (33) extends to the outside of the driving plate (31), the left side of the outer wall of the threaded column (33) is fixedly connected to one end of the rotating frame (34), the front end of the driving plate (31) is fixedly connected to the limiting strip (5), and the upper wall of the limiting strip (5) and the lower wall of the movable bin (32) are in the same horizontal plane.

4. A workpiece positioning and clamping device for a CNC machine tool according to claim 3, characterized in that: A threaded hole is formed through the left end of the moving block (35), the inner wall of the threaded hole is spirally connected to the outer wall of the threaded column (33), and the outer wall of the moving block (35) is slidably connected to the inner wall of the moving bin (32), and the rear end of the moving block (35) is rotatably connected to the front end of the rotary adjustment shaft (23).

5. The workpiece positioning and clamping device for a CNC machine tool according to claim 1, characterized in that: The speed-changing linkage mechanism (4) comprises a speed-changing gear set (41), a speed-receiving shaft (42), a mounting plate (43), a bidirectional screw rod (44), a bevel gear set (45), a driving plate (46) and a lifting block (48); the left end of the left support frame (21) is rotatably connected to the right end of the speed-receiving shaft (42); the left end of the rotating shaft penetrates the left support frame (21); and the speed-receiving shaft (42) is connected to the rotating shaft via the speed-changing gear set (41).

6. A workpiece positioning and clamping device for a CNC machine tool according to claim 5, characterized in that: The left sides of the front and rear ends of the clamping seat (11) are fixedly connected to the mounting plate (43), and the sides of the two mounting plates (43) close to each other are rotatably connected to the two ends of the bidirectional screw rod (44), and the front end of the bidirectional screw rod (44) passes through the front mounting plate (43), and the bidirectional screw rod (44) is connected to the speed receiving shaft (42) through a bevel gear set (45).

7. A workpiece positioning and clamping device for a CNC machine tool according to claim 6, characterized in that: The upper sides of the front ends of the two driving plates (46) are penetrated with screw holes, the inner walls of the two screw holes are spirally connected to the outer wall of the same bidirectional screw (44), and the right ends of the two driving plates (46) are provided with lifting bins (47), the inner wall of the lifting bins (47) is slidably connected to the outer wall of the lifting block (48), and the right end of the lifting block (48) is rotatably connected to the left end of the synchronous shaft (26).

8. The workpiece positioning and clamping device for a CNC machine tool according to claim 1, characterized in that: The pulling and pulling guide mechanism (6) comprises a guide frame (61), a pulling groove (62) is provided at the rear end of the clamping plate (24), and a rubber protrusion is fixedly connected to the inner wall of the pulling groove (62), the inner wall of the pulling groove (62) is slidably connected to the outer wall of the guide frame (61), and the rubber protrusion cooperates with the guide frame (61), a through hole is provided at the upper end of the extension plate (22), a screw (7) is movably connected inside the through hole, the upper front side of the clamping seat (11) is fixedly connected to the fixing plate (8), a screw hole is provided at the upper end of the fixing plate (8), and the screw hole is spirally connected to the screw (7).

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