Quick positioning and pre-clamping tool for numerical control machine tool

Abstract

The invention discloses a quick positioning and pre-clamping tool for a numerical control machine tool, and relates to the technical field of part machining. The rapid positioning and pre-clamping tool for the numerical control machine tool comprises the numerical control machine tool, a limiting assembly and a replacing assembly, a workbench is arranged on the numerical control machine tool, the replacing assembly comprises a movable frame, a connecting plate, a sliding plate, a second sliding block and a clamping block, the sliding plate is slidably installed in the movable frame, and a limiting groove is formed in one side of the sliding plate; a second sliding block is slidably installed in the limiting groove, a clamping block is fixedly installed on one side of the second sliding block, a clamping groove is formed in the top of the connecting plate, and the bottom end of the clamping block is installed in the clamping groove in a clamped mode. Through the arrangement of the replacement assembly, an operator is allowed to rapidly disassemble and replace the clamping plate moving in the two directions according to the specific requirements and shapes of workpieces, it means that the tool can adapt to the workpieces of different sizes, shapes and materials, a special clamp does not need to be customized for each workpiece, and therefore the machining flexibility and adaptability are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of parts processing, and in particular to a fast positioning pre-clamping tool for a numerically controlled machine tool. Background Art

[0002] CNC machine tool is the abbreviation of digital control machine tool. It is an automated machine tool equipped with a program control system. The control system can logically process programs specified by control codes or other symbolic instructions, decode them, express them in coded numbers, input them into the CNC device through information carriers, and after calculation and processing, the CNC device sends out various control signals to control the movement of the machine tool and automatically process parts according to the shape and size required by the drawing.

[0003] After exploration and analysis, the following shortcomings exist in actual use:

[0004] The clamping plate on some CNC machine tools' rapid positioning clamping fixtures in the prior art is fixed, so the clamping plate cannot be replaced according to the shape of the workpiece. Then it can only be used for workpieces of specific shapes or sizes. When workpieces of different shapes or sizes need to be processed, this fixture cannot meet the needs unless the entire fixture is replaced or adjusted, which will undoubtedly increase the complexity of the operation and the time cost.

[0005] In summary, the present application now proposes a CNC machine tool rapid positioning pre-clamping tool to solve the above-mentioned problems. Summary of the invention

[0006] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a CNC machine tool rapid positioning pre-clamping tool, which can solve the problem that the clamping plate on some CNC machine tool rapid positioning clamping tooling in the prior art is fixed, so the clamping plate cannot be replaced according to the shape of the workpiece, and it can only be used for workpieces of specific shapes or sizes.

[0007] To achieve the above object, the present invention provides the following technical solution: a fast positioning pre-clamping tool for a CNC machine tool, comprising:

[0008] CNC machine tools, which are equipped with work tables;

[0009] A limit assembly is arranged on a workbench, and includes a threaded column, a threaded block, a first sliding block, a vertical plate, an elastic limit plate and a rotating roller. The threaded column is threadedly mounted with a threaded block, the top of the threaded block is fixedly mounted with the first sliding block, the top of the first sliding block is fixedly mounted with the vertical plate, one side of the vertical plate is provided with an elastic limit plate, one side of the elastic limit plate is provided with a groove, and a plurality of groups of rotating rollers are rotatably mounted on the inner top of the groove;

[0010] A replacement component is arranged on a workbench, and the replacement component includes a movable frame, a connecting plate, a sliding plate, a second sliding block and a clamping block. The sliding plate is slidably installed inside the movable frame, a limiting groove is provided on one side of the sliding plate, a second sliding block is slidably installed inside the limiting groove, a clamping block is fixedly installed on one side of the second sliding block, a clamping groove is provided on the top of the connecting plate, and the bottom end of the clamping block is clamped and installed in the clamping groove.

[0011] Preferably, a driving device is provided on the top of the CNC machine tool, and the driving device drives the workbench to move forward and backward.

[0012] Preferably, the limit assembly also includes a fixed plate and a first slide groove, two groups of fixed plates are fixedly installed on the inner bottom of the workbench and are symmetrically distributed, the threaded column has two groups and is rotatably installed on one side of the fixed plate, the other end of the threaded column passes through the workbench and is fixedly installed with a rotating plate, the threaded column is threadedly installed with the workbench, and the top of the workbench is provided with a first slide groove, and the first sliding block is slidably installed inside the first slide groove, and the elastic limit plate can quickly and accurately position and clamp the workpiece, and can provide uniform clamping force, avoiding the risk of the workpiece falling off due to loose clamping, and also reducing the possibility of deformation of the workpiece due to excessive clamping force, reducing the time for clamping and positioning of the workpiece, thereby improving the overall processing efficiency. At the same time, the design of the threaded column enables the operator to quickly adjust the position of the elastic limit plate by rotating the threaded column, thereby realizing rapid positioning and clamping of the workpiece, such design greatly shortens the time for clamping and positioning of the workpiece, improves the overall processing efficiency, and the rotating roller on the elastic limit plate can play an auxiliary sliding role in the movement of the workpiece.

[0013] Preferably, a first spring is arranged between the vertical plate and the elastic limiting plate, one end of the first spring is fixedly installed on one side of the vertical plate, and the other end of the first spring is fixedly installed on one side of the elastic limiting plate, and a damper is arranged inside the first spring, so that the elastic limiting plate can apply a uniform clamping force, thereby ensuring accuracy and stability during the processing.

[0014] Preferably, the replacement component includes a clamping plate, a pull rod and a second spring. Two groups of clamping plates are arranged on the top of the workbench and are symmetrically distributed front to back. A movable frame is arranged on the front side of the clamping plate. The rear side of the clamping block is fixedly installed with the front side of the clamping plate. A pull rod is fixedly installed on the top of the sliding plate. The top end of the pull rod extends to the top of the movable frame. A second spring is sleeved and installed on the pull rod. One end of the second spring is fixedly installed with the top of the sliding plate, and the other end of the second spring is fixedly installed with the inner top of the movable frame, allowing the operator to quickly disassemble and replace the bidirectionally movable clamping plate according to the specific needs and shape of the workpiece, which means that the tooling can adapt to workpieces of different sizes, shapes and materials without the need to customize special fixtures for each workpiece, thereby greatly improving the flexibility and adaptability of processing. At the same time, the replaceability of the clamping plate also means that when a clamping plate is worn or damaged, only the clamping plate needs to be replaced instead of the entire tooling, which further reduces the maintenance and replacement costs and helps to improve processing efficiency, because the operator can quickly adjust the clamping plate to adapt to different workpieces, reducing the time required to replace tooling and reposition the workpiece.

[0015] Preferably, there are multiple groups of connecting plates and the rear side of the connecting plates is fixedly mounted to the front side of the clamping plates, so that the movement of the connecting plates drives the synchronous movement of the clamping plates.

[0016] Preferably, a driving motor is fixedly installed on the inner bottom of the workbench, and a rotating plate is fixedly installed on the output shaft of the driving motor. The top of the rotating plate is rotatably installed with the inner top of the workbench, a hinged plate is hingedly installed on the top of the rotating plate, and a movable plate is hingedly installed on the other end of the hinged plate. A second slide groove is opened on the top of the workbench, and a third sliding block is slidingly installed inside the second slide groove. The bottom of the third sliding block is fixedly installed on the top of the movable plate, and the top of the third sliding block is fixedly installed on the bottom of the movable frame, which can center the position of the workpiece after clamping, thereby improving the symmetry accuracy and overall quality of the product.

[0017] Preferably, two groups of fixed rods are fixedly installed on the front and rear inner walls of the workbench and are symmetrically distributed, and there are two groups of movable plates that are slidably installed on the fixed rods. Its arrangement facilitates the auxiliary support of the movement of the movable plates.

[0018] Preferably, the elastic limiting plate, the rotating roller and the clamping plate are all made of rubber material, and the rubber material has high elasticity to avoid damage to the workpiece.

[0019] Preferably, the CNC machine tool is externally connected to a controller, and the CNC machine tool, the driving device and the driving motor are all electrically connected to the controller.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The CNC machine tool rapid positioning pre-clamping fixture uses a fixed plate, a threaded column, a threaded block, a first slide groove, a first sliding block, a vertical plate, an elastic limit plate and a rotating roller in coordination. The elastic limit plate can quickly and accurately position and clamp the workpiece, and can provide a uniform clamping force, thereby avoiding the risk of the workpiece falling off due to loose clamping. At the same time, it also reduces the possibility of the workpiece being deformed due to excessive clamping force, and reduces the time for clamping and positioning the workpiece, thereby improving the overall processing efficiency. At the same time, the design of the threaded column allows the operator to quickly adjust the position of the elastic limit plate by rotating the threaded column, thereby achieving rapid positioning and clamping of the workpiece. This design greatly shortens the time for clamping and positioning the workpiece, improves the overall processing efficiency, and the rotating roller on the elastic limit plate can play an auxiliary sliding role in the movement of the workpiece.

[0022] (2) The CNC machine tool quick positioning pre-clamping fixture allows the operator to quickly disassemble and replace the bidirectional movable clamping plate according to the specific needs and shape of the workpiece through the coordinated use of the clamping plate, movable frame, connecting plate, sliding plate, second sliding block, clamping block, pull rod and second spring. This means that the fixture can adapt to workpieces of different sizes, shapes and materials without the need to customize special fixtures for each workpiece, thereby greatly improving the flexibility and adaptability of processing. At the same time, the replaceability of the clamping plate also means that when a clamping plate is worn or damaged, only the clamping plate needs to be replaced instead of the entire fixture, further reducing the cost of maintenance and replacement, and helping to improve processing efficiency, because the operator can quickly adjust the clamping plate to adapt to different workpieces, reducing the time required to replace the fixture and reposition the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0024] Figure 1 A perspective view of the present invention;

[0025] Figure 2 The present invention is a three-dimensional cutaway view Figure 1 ;

[0026] Figure 3 The present invention is a three-dimensional cutaway view Figure 2 ;

[0027] Figure 4 It is a partial stereogram of the present invention;

[0028] Figure 5 for Figure 4 A three-dimensional cross-sectional view of

[0029] Figure 6 It is a schematic diagram of a partial three-dimensional structure of the present invention;

[0030] Figure 7It is a schematic diagram of the internal structure of the workbench of the present invention.

[0031] Figure numerals: 1. CNC machine tool; 2. driving device; 3. workbench; 4. fixed plate; 5. threaded column; 6. threaded block; 7. first slide groove; 8. first sliding block; 9. vertical plate; 10. elastic limit plate; 11. rotating roller; 12. first spring; 13. clamping plate; 14. movable frame; 15. connecting plate; 16. sliding plate; 17. second sliding block; 18. clamping block; 19. pull rod; 20. second spring; 21. driving motor; 22. rotating plate; 23. fixed rod; 24. movable plate; 25. hinged plate; 26. second slide groove; 27. third sliding block. DETAILED DESCRIPTION

[0032] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0033] See also Figure 1-7 The present invention provides a technical solution: a CNC machine tool rapid positioning pre-clamping tool, comprising a CNC machine tool 1, a limiting assembly and a replacement assembly, wherein a workbench 3 is arranged on the CNC machine tool 1; the limiting assembly is arranged on the workbench 3, and the limiting assembly comprises a threaded column 5, a threaded block 6, a first sliding block 8, a vertical plate 9, an elastic limiting plate 10 and a rotating roller 11, the threaded column 5 is threadedly installed with a threaded block 6, the top of the threaded block 6 is fixedly installed with a first sliding block 8, the top of the first sliding block 8 is fixedly installed with a vertical plate 9, one side of the vertical plate 9 is provided with an elastic limiting plate 10, and the elastic A groove is provided on one side of the limit plate 10, and a plurality of sets of rotating rollers 11 are rotatably installed on the inner top of the groove; the replacement component is arranged on the workbench 3, and the replacement component includes a movable frame 14, a connecting plate 15, a sliding plate 16, a second sliding block 17 and a clamping block 18. The sliding plate 16 is slidably installed inside the movable frame 14, a limit groove is provided on one side of the sliding plate 16, a second sliding block 17 is slidably installed inside the limit groove, a clamping block 18 is fixedly installed on one side of the second sliding block 17, a clamping groove is provided on the top of the connecting plate 15, and the bottom end of the clamping block 18 is clamped and installed in the clamping groove.

[0034] Furthermore, a driving device 2 is provided on the top of the CNC machine tool 1, and the driving device 2 drives the workbench 3 to move forward and backward.

[0035] Furthermore, the limiting assembly also includes a fixed plate 4 and a first slide groove 7. Two groups of fixed plates 4 are fixedly installed at the inner bottom of the workbench 3 and are symmetrically distributed. There are two groups of threaded columns 5 and are rotatably installed on one side of the fixed plate 4. The other end of the threaded column 5 passes through the workbench 3 and is fixedly installed with a rotating plate. The threaded column 5 is threadedly installed with the workbench 3. A first slide groove 7 is provided on the top of the workbench 3. A first sliding block 8 is slidably installed inside the first slide groove 7. The position of the elastic limiting plate 10 is adjusted according to the width of the workpiece. First, the threaded column 5 is rotated so that the threaded column 5 drives the threaded block 6 to move, and the vertical plate 9 is driven by the first sliding block 8 on the threaded block 6 to move, so that the vertical plate 9 drives the elastic limiting plate 10 to move to the appropriate position, and then the workpiece is placed on the workbench 3. The workpiece is elastically clamped by two groups of elastic limiting plates 10. The elastic limiting plate 10 can quickly and accurately position and clamp the workpiece, can provide uniform clamping force, and avoid The risk of the workpiece falling off due to loose clamping is reduced, and the possibility of the workpiece being deformed due to excessive clamping force is also reduced, and the time for clamping and positioning the workpiece is reduced, thereby improving the overall processing efficiency. At the same time, the design of the threaded column 5 allows the operator to quickly adjust the position of the elastic limit plate 10 by rotating the threaded column 5, thereby realizing rapid positioning and clamping of the workpiece. This design greatly shortens the time for clamping and positioning the workpiece and improves the overall processing efficiency. The rotating roller 11 on the elastic limit plate 10 can assist the sliding of the workpiece. A first spring 12 is arranged between the vertical plate 9 and the elastic limit plate 10. One end of the first spring 12 is fixedly installed on one side of the vertical plate 9, and the other end of the first spring 12 is fixedly installed on one side of the elastic limit plate 10. A damper is arranged inside the first spring 12, which can enable the elastic limit plate 10 to apply a uniform clamping force, thereby ensuring accuracy and stability during the processing.

[0036] Furthermore, the replacement component includes a clamping plate 13, a pull rod 19 and a second spring 20. Two groups of clamping plates 13 are arranged on the top of the workbench 3 and are symmetrically distributed front to back. A movable frame 14 is arranged on the front side of the clamping plate 13. The rear side of the clamping block 18 is fixedly installed with the front side of the clamping plate 13. A pull rod 19 is fixedly installed on the top of the sliding plate 16. The top end of the pull rod 19 extends to the top of the movable frame 14. A second spring 20 is sleeved and installed on the pull rod 19. One end of the second spring 20 is fixedly installed with the top of the sliding plate 16, and the other end of the second spring 20 is fixedly installed with the inner top of the movable frame 14. The clamping plate 13 can be replaced according to the workpiece. First, the pull rod 19 is pulled to drive the sliding plate 16 to move upward and compress the second spring 20, so that the sliding plate 16 drives the clamping block 18 on the second sliding block 17 away from the connecting plate 15, and the clamping plate 13 can be disassembled. When replacing, repeat the above steps to move the connecting plate 15 to the bottom of the clamping block 18, and drive the clamping block 18 to move downward through the reaction force of the second spring 20, so that the clamping block 18 can be clamped in the clamping slot installed on the connecting plate 15, allowing the operator to quickly disassemble and replace the bidirectional movable clamping plate 13 according to the specific needs and shape of the workpiece, which means that the tooling can adapt to workpieces of different sizes, shapes and materials, without the need to customize special fixtures for each workpiece, thereby greatly improving the flexibility and adaptability of processing. At the same time, the replaceability of the clamping plate 13 also means that when a clamping plate 13 is worn or damaged, only the clamping plate 13 needs to be replaced instead of the entire tooling, further reducing the cost of maintenance and replacement, and helping to improve processing efficiency, because the operator can quickly adjust the clamping plate 13 to adapt to different workpieces, reducing the time required to replace tooling and reposition the workpiece.

[0037] Furthermore, there are multiple groups of connecting plates 15 and the rear side of the connecting plates 15 is fixedly installed with the front side of the clamping plate 13 , and the movement of the connecting plates 15 drives the synchronous movement of the clamping plate 13 .

[0038] Secondly, a driving motor 21 is fixedly installed on the inner bottom of the workbench 3, and a rotating plate 22 is fixedly installed on the output shaft of the driving motor 21. The top of the rotating plate 22 is rotatably installed with the inner top of the workbench 3, and a hinged plate 25 is hingedly installed on the top of the rotating plate 22. The other end of the hinged plate 25 is hingedly installed with a moving plate 24. A second slide groove 26 is opened on the top of the workbench 3, and a third sliding block 27 is slidably installed inside the second slide groove 26. The bottom of the third sliding block 27 is fixedly installed with the top of the moving plate 24. The third sliding block The top of 27 is fixedly installed with the bottom of the movable frame 14, and the rotating plate 22 is driven to rotate by the driving motor 21, so that the movable plate 24 is driven to slide on the fixed rod 23 through the hinged plate 25, and the movable frame 14 is driven to move by the rotating plate 22 on the movable plate 24, so that the clamping plate 13 is driven by the movable frame 14 to clamp the workpiece in the center, and at the same time, the rotating roller 11 on the elastic limiting plate 10 assists the workpiece to move, so that the position of the clamped workpiece can be centered, thereby improving the symmetry accuracy and overall quality of the product.

[0039] Secondly, two groups of fixed rods 23 are fixedly installed on the front and rear inner walls of the workbench 3 and are symmetrically distributed. There are two groups of movable plates 24 and they are slidably installed on the fixed rods 23. The arrangement is convenient for auxiliary support for the movement of the movable plates 24. The elastic limit plate 10, the rotating roller 11 and the clamping plate 13 are all made of rubber material. The rubber material has high elasticity to avoid damage to the workpiece. A controller is externally connected to the CNC machine tool 1, and the CNC machine tool 1, the drive device 2 and the drive motor 21 are all electrically connected to the controller.

[0040] Working principle: When in use, the position of the elastic limit plate 10 is adjusted according to the width of the workpiece. First, the threaded column 5 is rotated to make the threaded block 6 driven by the threaded column 5 move, and the vertical plate 9 is driven to move by the first sliding block 8 on the threaded block 6, so that the vertical plate 9 drives the elastic limit plate 10 to move to the appropriate position, and then the workpiece is placed on the workbench 3, and the workpiece is elastically clamped by two sets of elastic limit plates 10, and then the driving motor 21 is started, and the driving motor 21 drives the rotating plate 22 to rotate, so that the movable plate 24 is driven to slide on the fixed rod 23 through the hinged plate 25, and the movable frame 14 is driven to move through the rotating plate 22 on the movable plate 24, so that the clamping plate 13 is driven by the movable frame 14 to clamp the workpiece in the center, and at the same time, the elastic The rotating roller 11 on the limit plate 10 assists the workpiece to move, so that the workpiece moves to the center position for clamping and fixing. Secondly, the driving device 2 is started. The driving device 2 can drive the workpiece on the workbench 3 to move forward and backward for processing. The clamping plate 13 can be replaced according to the workpiece. First, pull the pull rod 19 to drive the sliding plate 16 to move upward and compress the second spring 20, so that the sliding plate 16 drives the block 18 on the second sliding block 17 away from the connecting plate 15, and the clamping plate 13 can be disassembled. When replacing, repeat the above steps, move the connecting plate 15 to the bottom of the block 18, and drive the block 18 to move downward through the reaction force of the second spring 20, so that the block 18 can be clamped and installed in the slot on the connecting plate 15.

[0041] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A fast positioning pre-clamping tool for a CNC machine tool, characterized in that: include: A numerically controlled machine tool (1), wherein a workbench (3) is provided on the numerically controlled machine tool (1); A limit assembly is arranged on a workbench (3), the limit assembly comprising a threaded column (5), a threaded block (6), a first sliding block (8), a vertical plate (9), an elastic limit plate (10) and a rotating roller (11); the threaded column (5) is threadedly mounted with a threaded block (6); the top of the threaded block (6) is fixedly mounted with a first sliding block (8); the top of the first sliding block (8) is fixedly mounted with a vertical plate (9); one side of the vertical plate (9) is provided with an elastic limit plate (10); one side of the elastic limit plate (10) is provided with a groove; a plurality of groups of rotating rollers (11) are rotatably mounted on the top of the inner side of the groove; A replacement component is arranged on a workbench (3), and comprises a movable frame (14), a connecting plate (15), a sliding plate (16), a second sliding block (17) and a clamping block (18); the sliding plate (16) is slidably installed inside the movable frame (14); a limiting groove is provided on one side of the sliding plate (16); a second sliding block (17) is slidably installed inside the limiting groove; a clamping block (18) is fixedly installed on one side of the second sliding block (17); a clamping groove is provided on the top of the connecting plate (15); and the bottom end of the clamping block (18) is clamped and installed in the clamping groove.

2. The fast positioning pre-clamping fixture for CNC machine tools according to claim 1, characterized in that: A driving device (2) is arranged on the top of the numerically controlled machine tool (1), and the driving device (2) drives the workbench (3) to move forward and backward.

3. The rapid positioning pre-clamping fixture for CNC machine tools according to claim 2, characterized in that: The limiting assembly also includes a fixed plate (4) and a first slide groove (7). Two groups of fixed plates (4) are fixedly installed on the inner bottom of the workbench (3) and are symmetrically distributed. There are two groups of threaded columns (5) and they are rotatably installed on one side of the fixed plate (4). The other end of the threaded column (5) passes through the workbench (3) and is fixedly installed with a rotating plate. The threaded column (5) is threadedly installed on the workbench (3). The top of the workbench (3) is provided with a first slide groove (7), and the first sliding block (8) is slidably installed inside the first slide groove (7).

4. The rapid positioning pre-clamping fixture for CNC machine tools according to claim 3, characterized in that: A first spring (12) is arranged between the vertical plate (9) and the elastic limiting plate (10), one end of the first spring (12) is fixedly mounted on one side of the vertical plate (9), the other end of the first spring (12) is fixedly mounted on one side of the elastic limiting plate (10), and a damper is arranged inside the first spring (12).

5. The rapid positioning pre-clamping fixture for CNC machine tools according to claim 4, characterized in that: The replacement component comprises a clamping plate (13), a pull rod (19) and a second spring (20). Two groups of clamping plates (13) are arranged on the top of the workbench (3) and are symmetrically distributed front to back. A movable frame (14) is arranged on the front side of the clamping plate (13). The rear side of the clamping block (18) is fixedly installed on the front side of the clamping plate (13). A pull rod (19) is fixedly installed on the top of the sliding plate (16). The top end of the pull rod (19) extends to the top of the movable frame (14). A second spring (20) is sleeved on the pull rod (19). One end of the second spring (20) is fixedly installed on the top of the sliding plate (16), and the other end of the second spring (20) is fixedly installed on the inner top of the movable frame (14).

6. The rapid positioning pre-clamping fixture for CNC machine tools according to claim 5, characterized in that: There are multiple groups of connecting plates (15), and the rear side of the connecting plates (15) is fixedly mounted to the front side of the clamping plate (13).

7. The rapid positioning pre-clamping fixture for CNC machine tools according to claim 6, characterized in that: A driving motor (21) is fixedly mounted on the inner bottom of the workbench (3); a rotating plate (22) is fixedly mounted on the output shaft of the driving motor (21); the top of the rotating plate (22) is rotatably mounted on the inner top of the workbench (3); a hinged plate (25) is hingedly mounted on the top of the rotating plate (22); a movable plate (24) is hingedly mounted on the other end of the hinged plate (25); a second slide groove (26) is opened on the top of the workbench (3); a third sliding block (27) is slidably mounted inside the second slide groove (26); the bottom of the third sliding block (27) is fixedly mounted on the top of the movable plate (24); and the top of the third sliding block (27) is fixedly mounted on the bottom of the movable frame (14).

8. The fast positioning pre-clamping fixture for CNC machine tools according to claim 7, characterized in that: Two groups of fixed rods (23) are fixedly installed on the front and rear inner walls of the workbench (3) and are symmetrically distributed. There are two groups of movable plates (24) which are slidably installed on the fixed rods (23).

9. The fast positioning pre-clamping fixture for CNC machine tools according to claim 8, characterized in that: The elastic limiting plate (10), the rotating roller (11) and the clamping plate (13) are all made of rubber.

10. The fast positioning pre-clamping fixture for CNC machine tools according to claim 9, characterized in that: The numerically controlled machine tool (1) is externally connected to a controller, and the numerically controlled machine tool (1), the driving device (2) and the driving motor (21) are all electrically connected to the controller.

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