Numerical control machine tool

Abstract

This invention discloses a CNC machine tool, comprising: a machine base assembled from a first base plate and a second base plate arranged sequentially; each of the first and second base plates has a strip-shaped through hole extending in a left-right direction on its upper surface; a limiting housing with an internal receiving groove is installed on the outer sides of both ends of each strip-shaped through hole and on the lower surface of each of the first and second base plates; each limiting housing has several elastic support members extending in a vertical direction at the bottom of the receiving groove; one end of a metal sheet is embedded in the limiting housing and connected to the upper end of the elastic support member; the other end of the metal sheet is detachably connected to a first or second movable block in the strip-shaped through hole and slides in cooperation with the inner wall of the strip-shaped through hole. This invention can meet the processing needs of various workpieces with large size differences, improve the convenience and efficiency of processing, and effectively avoid the adverse interference of debris splashing on precision components such as lead screws during processing.

Description

Technical Field

[0001] This invention relates to the field of machine tool technology, and more particularly to a CNC machine tool. Background Technology

[0002] A CNC machine tool is a highly efficient automated machine tool consisting of mechanical equipment and a CNC system, specifically designed for machining complex parts. It evolved from CNC milling machines and achieves multiple machining functions by mounting different types of cutting tools on a tool magazine. The clamping mechanism of a CNC machine tool typically uses guide rails to drive clamping plates to stably hold the workpiece. This limits the size and specifications of workpieces that each machine tool can process, making it impossible to use a single machine tool to process different types of workpieces with a wide size range. Summary of the Invention

[0003] The purpose of this invention is to provide a CNC machine tool that can meet the processing needs of various workpieces with large size differences, improve the convenience and efficiency of processing, and effectively avoid the adverse interference of debris splashing on precision components such as lead screws during processing, thus ensuring safety and stability during long-term processing.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a CNC machine tool, comprising: a machine base, a three-axis drive assembly disposed above the machine base, and a tool assembly mounted on the three-axis drive assembly. The machine base disposed below the tool assembly is formed by splicing a first base plate and a second base plate arranged sequentially. Each of the first base plate and the second base plate has a strip-shaped through hole extending in the left-right direction on its upper surface. A first movable block and a second movable block are movably disposed in each of the strip-shaped through holes. A bidirectional lead screw extending in the left-right direction is rotatably mounted on the lower surface of each of the first base plate and the second base plate on one side of the strip-shaped through hole. The lower ends of the first movable block and the second movable block are threadedly connected to the corresponding bidirectional lead screw through a first connecting block, so that the first movable block and the second movable block located in the same strip-shaped through hole can move towards each other with the bidirectional lead screw. The two first movable blocks are arranged far apart from each other, and the upper surface of each first movable block is higher than the upper surface of the first substrate and the second substrate. The two second movable blocks are arranged close to each other, and the upper surface of each second movable block is lower than the upper surface of the first substrate and the second substrate. Each second movable block has a vertically extending groove on its upper surface. A baffle is movably embedded in the groove and connected to the piston rod of a cylinder. When the baffle moves with the cylinder to the first position, its upper surface is flush with the upper surface of the first substrate and the second substrate. When the baffle moves with the cylinder to the second position, its upper surface is higher than the upper surface of the first substrate and the second substrate. On the outer sides of both ends of each of the strip-shaped through holes and on the lower surfaces of the first and second substrates, a limiting housing with an internal receiving groove is installed. At the bottom of the receiving groove of each limiting housing, several elastic support members extending vertically are provided. One end of a metal sheet is embedded in the limiting housing and connected to the upper end of the elastic support member. The other end of the metal sheet is detachably connected to the first or second movable block in the strip-shaped through hole and slides in cooperation with the inner wall of the strip-shaped through hole.

[0005] The following are further improvements to the above technical solution: 1. In the above scheme, the tool assembly further includes: a housing and a first cutting head and a second cutting head respectively corresponding to the first substrate and the second substrate. The upper ends of the first cutting head and the second cutting head, which extend outward from the housing, are each mounted in a support block disposed in the housing via a tool holder. One end of each of the two support blocks rotatably mounted in the housing is equipped with a synchronous pulley. The two synchronous pulleys are connected by a synchronous belt drive. A motor that is drively connected to any one of the support blocks is mounted on the upper surface of the housing.

[0006] 2. In the above scheme, a guide groove for embedding a tool holder is provided on the lower end surface of the strip-shaped support block. A sliding rod is installed on the upper end of the tool holder that is movably embedded in the guide groove. The two ends of the sliding rod extend outward from the strip-shaped sliding grooves on the two side surfaces of the support block and slide in cooperation with the corresponding strip-shaped sliding grooves. A hydraulic rod is installed on one side surface of the support block and above the sliding rod. The lower end of the hydraulic rod is connected to one end of the sliding rod.

[0007] 3. In the above scheme, the piston rod of the hydraulic rod is connected to the sliding rod through a hinge.

[0008] 4. In the above scheme, the metal sheet is magnetically connected to the first movable block and the second movable block.

[0009] 5. In the above scheme, the elastic support is always in a tensile state.

[0010] 6. In the above scheme, a guide groove that slides and engages with the metal sheet is provided on the first substrate and the second substrate on the outer side of both ends of the strip-shaped through hole.

[0011] 7. In the above scheme, the guide groove, which is connected to the strip-shaped through hole and the receiving groove at both ends, is an arc-shaped guide groove.

[0012] 8. In the above scheme, the inner wall of the strip-shaped through hole is provided with guide grooves for embedding at the two sides of the metal sheet.

[0013] 9. In the above scheme, a guide rail is provided on the lower surface of the first substrate and the second substrate on the other side of the strip-shaped through hole, and the lower ends of the first movable block and the second movable block are movably connected to the corresponding guide rail through a second connecting block.

[0014] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: 1. The CNC machine tool of the present invention comprises a machine base assembled from a first base plate and a second base plate arranged sequentially. Each of the upper surfaces of the first and second base plates has a strip-shaped through hole extending in a left-right direction. A first movable block and a second movable block are movably disposed within each strip-shaped through hole. The first and second movable blocks located within the same strip-shaped through hole can move towards each other with a bidirectional lead screw. The two first movable blocks are spaced apart from each other, and the upper surface of each first movable block is higher than the upper surfaces of the first and second base plates. The two second movable blocks are spaced close to each other, and the upper surface of each second movable block is lower than the upper surfaces of the first and second base plates. Each second movable block has a vertically extending groove on its upper surface. A baffle is movably embedded in the groove and connected to the piston rod of a cylinder. When the baffle moves with the cylinder to a first position, its upper surface is flush with the upper surfaces of the first and second base plates. When the baffle moves with the cylinder... When in the second position, its upper surface is higher than the upper surfaces of the first and second substrates. A limiting housing with an internal receiving groove is installed on the outer side of each end of the strip-shaped through hole and on the lower surface of the first and second substrates respectively. Several elastic support members extending vertically are provided at the bottom of the receiving groove of each limiting housing. One end of a metal sheet is embedded in the limiting housing and connected to the upper end of the elastic support member. The other end of the metal sheet is detachably connected to the first or second movable block in the strip-shaped through hole and slides in cooperation with the inner sidewall of the strip-shaped through hole. This can realize the clamping, positioning and processing of a group of large-sized workpieces, as well as the simultaneous clamping, positioning and processing of two groups of small-sized workpieces. This meets the processing needs of various workpieces with large size differences, improves the convenience and efficiency of processing, and can also effectively avoid the adverse interference of debris splashing during processing to precision components such as lead screws, ensuring safety and stability during long-term processing.

[0015] 2. The CNC machine tool of the present invention further includes: a housing and a first cutting head and a second cutting head respectively corresponding to the first base plate and the second base plate. The upper ends of the first cutting head and the second cutting head, which extend outward from the housing, are each mounted in a support block disposed within the housing via a tool holder. Two support blocks rotatably mounted within the housing are each equipped with a synchronous pulley at one end. The two synchronous pulleys are connected by a synchronous belt drive. A motor connected to any one of the support blocks is mounted on the upper surface of the housing. A strip-shaped support block has an opening on its lower end surface. There is a guide groove for embedding a tool holder. A sliding rod is installed on the upper end of the tool holder, which is movably embedded in the guide groove. The two ends of the sliding rod extend outward from the strip grooves opened on the two side surfaces of the support block and slide in cooperation with the corresponding strip grooves. A hydraulic rod is installed on one side surface of the support block and above the sliding rod. The lower end of the hydraulic rod is connected to one end of the sliding rod. It can simultaneously process two sets of small workpieces with two tool heads, or process a set of large workpieces with one tool head while avoiding damage to the workpiece by the other tool head. Attached Figure Description

[0016] Appendix Figure 1 This is a schematic diagram of the structure of the CNC machine tool of the present invention; Appendix Figure 2 This is a partial structural cross-sectional view of the CNC machine tool of the present invention; Appendix Figure 3 This is a partial exploded view of the CNC machine tool of the present invention; Appendix Figure 4 This is a partial structural schematic diagram of the tool assembly in the CNC machine tool of the present invention; Appendix Figure 5 for Figure 4 A schematic diagram of the decomposition of a local structure.

[0017] In the above figures: 1. First substrate; 2. Second substrate; 3. Strip-shaped through hole; 41. First movable block; 42. Second movable block; 5. Bidirectional lead screw; 61. First connecting block; 62. Second connecting block; 7. Guide rail; 71. Fixing block; 8. Slide groove; 9. Baffle; 10. Cylinder; 11. Alternating groove; 12. Adapter plate; 13. Bearing seat; 14. Limiting housing; 141. Receiving groove; 15. Metal sheet; 151 152. Guide groove; 16. Elastic support; 17. Housing; 181. First cutter head; 182. Second cutter head; 19. Tool holder; 20. Support block; 21. Machine base; 22. Three-axis drive assembly; 23. Tool assembly; 241. Synchronous pulley; 242. Synchronous belt; 25. Motor; 261. Guide groove; 262. Sliding rod; 263. Strip groove; 27. Hydraulic rod; 28. Hinge. Detailed Implementation

[0018] The present patent can be further understood through the specific embodiments given below, but they are not intended to limit the present patent.

[0019] Example 1: A CNC machine tool includes: a machine base 21, a three-axis drive assembly 22 disposed above the machine base 21, and a tool assembly 23 mounted on the three-axis drive assembly 22. The machine base 21, disposed below the tool assembly 23, is formed by splicing a first base plate 1 and a second base plate 2 arranged sequentially. Each of the first base plate 1 and the second base plate 2 has a strip-shaped through hole 3 extending in the left-right direction on its upper surface. A first movable block 41 and a second movable block 42 are movably disposed in each of the strip-shaped through holes 3. A bidirectional lead screw 5 extending in the left-right direction is rotatably mounted on the lower surface of each of the first base plate 1 and the second base plate 2 on one side of the strip-shaped through hole 3. The lower ends of the first movable block 41 and the second movable block 42 are threadedly connected to the corresponding bidirectional lead screw 5 through a first connecting block 61, so that the first movable block 41 and the second movable block 42 located in the same strip-shaped through hole 3 can move towards each other with the bidirectional lead screw 5. Two first movable blocks 41 are arranged far apart from each other, and the upper surface of each first movable block 41 is higher than the upper surface of the first substrate 1 and the second substrate 2. Two second movable blocks 42 are arranged close to each other, and the upper surface of each second movable block 42 is lower than the upper surface of the first substrate 1 and the second substrate 2. Each second movable block 42 has a vertically extending groove 8 on its upper surface. A baffle 9 is movably embedded in the groove 8 and connected to the piston rod of a cylinder 10. When the baffle 9 moves with the cylinder 10 to the first position, its upper surface is flush with the upper surface of the first substrate 1 and the second substrate 2. When the baffle 9 moves with the cylinder 10 to the second position, its upper surface is higher than the upper surface of the first substrate 1 and the second substrate 2. On the outer sides of both ends of each of the above-mentioned strip-shaped through holes 3 and on the lower surfaces of the first substrate 1 and the second substrate 2, a limiting housing 14 with an internal receiving groove 141 is installed. At the bottom of the receiving groove 141 of each limiting housing 14, several elastic support members 16 extending in the vertical direction are provided. One end of a metal sheet 15 is embedded in the limiting housing 14 and connected to the upper end of the elastic support member 16. The other end of the metal sheet 15 is detachably connected to the first movable block 41 or the second movable block 42 in the strip-shaped through hole 3 and slides in cooperation with the inner sidewall of the strip-shaped through hole 3.

[0020] The aforementioned tool assembly 23 further includes: a housing 17 and a first cutting head 181 and a second cutting head 182 respectively corresponding to the first substrate 1 and the second substrate 2. The upper ends of the first cutting head 181 and the second cutting head 182, which extend outward from the housing 17, are each mounted in a support block 20 disposed in the housing 17 via a tool holder 19. Each of the two support blocks 20 rotatably mounted in the housing 17 has a synchronous pulley 241 mounted on one end. The two synchronous pulleys 241 are connected by a synchronous belt 242. A motor 25 is mounted on the upper surface of the housing 17 and is connected to either support block 20.

[0021] A guide groove 261 for inserting a tool holder 19 is provided on the lower end surface of the strip-shaped support block 20. A sliding rod 262 is installed on the upper end of the tool holder 19, which is movably inserted into the guide groove 261. The two ends of the sliding rod 262 extend outward from the strip-shaped sliding grooves 263 on the two side surfaces of the support block 20 and slide in cooperation with the corresponding strip-shaped sliding grooves 263. A hydraulic rod 27 is installed on one side surface of the support block 20 and above the sliding rod 262. The lower end of the hydraulic rod 27 is connected to one end of the sliding rod 262. The piston rod of the hydraulic rod 27 is connected to the sliding rod 262 through a hinge 28.

[0022] When it is necessary to process a small workpiece, the piston rods of the two cylinders 10 are both in the extended state, so that the two baffles 9 are moved up and above the upper surface of the corresponding first base plate 1 and second base plate 2 under the drive of the cylinders 10. At this time, one end of the metal sheet 15 is connected to the first movable block 41 and the second movable block 42 or the baffle 9 in the second movable block 42 by magnetic attraction, so that it can move with the first movable block 41 and the baffle 9. Two identical workpieces to be processed are placed on the upper surfaces of the first substrate 1 and the second substrate 2, respectively. The two bidirectional lead screws 5 are driven by a motor to rotate, so that the first movable block 41 and the second movable block 42 on each bidirectional lead screw 5 move closer to each other until the first movable block 41 and the baffle 9 that moves with the second movable block 42 cooperate to clamp the workpiece to be processed. At this time, the metal sheet 15 that moves with the first movable block 41 and the baffle 9 blocks the strip-shaped through hole outside the workpiece. The elastic support 16 at the other end of the metal sheet 15 can pull the metal sheet 15 to keep the metal sheet 15 flat, so as to avoid the flying debris during the processing and cause adverse interference to the lead screw and other precision components. Correspondingly, the first cutting head 181 and the second cutting head 182 of the tool assembly 23 are kept in the state of extending out of the housing 17 under the drive of the corresponding hydraulic rod 27. Then, through the cooperation of the motor 25 with the synchronous pulley 241 and the synchronous belt 242, the first cutting head 181 and the second cutting head 182 are synchronously driven to rotate and process the workpieces to be processed that are clamped and fixed on the first substrate 1 and the second substrate 2 respectively. When a large workpiece needs to be processed, and the clamping mechanism on the first base plate 1 and the second base plate 2 is insufficient to clamp the workpiece, the piston rods of the two cylinders 10 are placed in the retracted state so that the two baffles 9 are moved down and retracted to be flush with the upper surface of the first base plate 1 and the second base plate 2 under the drive of the cylinders 10. At this time, one end of the metal sheet 15 is connected to the corresponding first movable block 41 by magnetic attraction so that it can move with the first movable block 41. A large workpiece is placed on the upper surface of the first substrate 1 and the second substrate 2. Then, the two bidirectional lead screws 5 are driven by the motor to rotate, and each of them drives the first movable block 41 to approach the workpiece until the workpiece is clamped. At this time, the metal sheet 15 that moves towards the two first movable blocks 41 shields the strip-shaped through hole outside the workpiece. Correspondingly, the first cutting head 181 of the tool assembly 23 is kept in the state of extending out of the housing 17 under the drive of the corresponding hydraulic rod 27, and the second cutting head 152 of the tool assembly 20 is retracted into the housing 17 under the drive of the corresponding hydraulic rod 27. Then, the first cutting head 181 is driven to rotate by the motor 25 to process the large-sized workpiece that is clamped and fixed. By using two sets of shorter bidirectional lead screw guides, workpieces of different specifications with large spans can be clamped and processed, thereby reducing the requirements for guides, reducing costs, and maintaining the stability and holding capacity of clamping force.

[0023] Example 2: A CNC machine tool includes: a machine base 21, a three-axis drive assembly 22 disposed above the machine base 21, and a tool assembly 23 mounted on the three-axis drive assembly 22. The machine base 21, disposed below the tool assembly 23, is formed by splicing a first base plate 1 and a second base plate 2 arranged sequentially. Each of the first base plate 1 and the second base plate 2 has a strip-shaped through hole 3 extending in the left-right direction on its upper surface. A first movable block 41 and a second movable block 42 are movably disposed in each of the strip-shaped through holes 3. A bidirectional lead screw 5 extending in the left-right direction is rotatably mounted on the lower surface of each of the first base plate 1 and the second base plate 2 on one side of the strip-shaped through hole 3. The lower ends of the first movable block 41 and the second movable block 42 are threadedly connected to the corresponding bidirectional lead screw 5 through a first connecting block 61, so that the first movable block 41 and the second movable block 42 located in the same strip-shaped through hole 3 can move towards each other with the bidirectional lead screw 5. Two first movable blocks 41 are arranged far apart from each other, and the upper surface of each first movable block 41 is higher than the upper surface of the first substrate 1 and the second substrate 2. Two second movable blocks 42 are arranged close to each other, and the upper surface of each second movable block 42 is lower than the upper surface of the first substrate 1 and the second substrate 2. Each second movable block 42 has a vertically extending groove 8 on its upper surface. A baffle 9 is movably embedded in the groove 8 and connected to the piston rod of a cylinder 10. When the baffle 9 moves with the cylinder 10 to the first position, its upper surface is flush with the upper surface of the first substrate 1 and the second substrate 2. When the baffle 9 moves with the cylinder 10 to the second position, its upper surface is higher than the upper surface of the first substrate 1 and the second substrate 2. On the outer sides of both ends of each of the strip-shaped through holes 3 and on the lower surfaces of the first substrate 1 and the second substrate 2, a limiting housing 14 with an internal receiving groove 141 is installed. At the bottom of the receiving groove 141 of each limiting housing 14, several elastic support members 16 extending vertically are provided. One end of a metal sheet 15 is embedded in the limiting housing 14 and connected to the upper end of the elastic support member 16. The other end of the metal sheet 15 is detachably connected to the first movable block 41 or the second movable block 42 in the strip-shaped through hole 3 and slides in cooperation with the inner sidewall of the strip-shaped through hole 3.

[0024] On the first substrate 1 and the second substrate 2, a guide groove 151 is provided on the outer side of both ends of the strip-shaped through hole 3, which slides and engages with the metal sheet 15; the guide groove 151, which is connected to the strip-shaped through hole 3 and the receiving groove 141 at both ends, is an arc-shaped guide groove.

[0025] The inner wall of the above-mentioned strip-shaped through hole 3 is provided with guide grooves 152 for the metal sheet 15 to be embedded at both sides of the edge; the metal sheet 15 is magnetically connected to the first movable block 41 and the second movable block 42; the elastic support member 16 is always in a stretched state.

[0026] Each of the first substrate 1 and the second substrate 2 has a guide rail 7 on its lower surface and on the other side of the strip-shaped through hole 3. The lower ends of the first movable block 41 and the second movable block 42 are movably connected to the corresponding guide rail 7 through a second connecting block 62. Each of the above guide rails 7 is mounted on the first substrate 1 and the second substrate 2 by fixing blocks 71 respectively provided at both ends.

[0027] A clearance groove 11 communicating with the slide 8 is provided on one side surface of the second movable block 42. One end of a transition plate 12 passes through the clearance groove 11 and is connected to the baffle 9 in the slide 8. The other end of the transition plate 12 is connected to the piston rod of the cylinder 10 installed on the second movable block 42.

[0028] Each of the aforementioned bidirectional lead screws 5 is rotatably mounted on the first substrate 1 and the second substrate 2 via at least two spaced bearing seats 13.

[0029] When using the aforementioned CNC machine tool, it can both clamp, position, and process a group of large-sized workpieces, and simultaneously clamp, position, and process two groups of small-sized workpieces. This satisfies the processing needs of various workpieces with significant size differences, improves processing convenience and efficiency, and effectively avoids the adverse interference to precision components such as lead screws caused by flying debris during processing, ensuring safety and stability during long-term processing. Furthermore, it can simultaneously process two groups of small-sized workpieces using two cutting heads, and process a group of large-sized workpieces using one cutting head while avoiding damage to the workpiece from the other cutting head.

[0030] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A CNC machine tool, comprising: The machine base (21), the three-axis drive assembly (22) disposed above the machine base (21), and the tool assembly (23) mounted on the three-axis drive assembly (22) are characterized in that: the machine base (21) disposed below the tool assembly (23) is composed of a first base plate (1) and a second base plate (2) disposed sequentially, and each of the first base plate (1) and the second base plate (2) has a strip-shaped through hole (3) extending in the left and right direction on its upper surface, and a first movable block (4) can be movably disposed in each strip-shaped through hole (3). 1) The second movable block (42) is rotatably mounted on the lower surface of the first substrate (1) and the second substrate (2) on one side of the strip-shaped through hole (3) with a bidirectional lead screw (5) extending in the left and right direction. The lower ends of the first movable block (41) and the second movable block (42) are threadedly connected to the corresponding bidirectional lead screw (5) through a first connecting block (61), so that the first movable block (41) and the second movable block (42) located in the same strip-shaped through hole (3) can move towards each other with the bidirectional lead screw (5); Two first movable blocks (41) are arranged far apart from each other, and the upper surface of each first movable block (41) is higher than the upper surface of the first substrate (1) and the second substrate (2). Two second movable blocks (42) are arranged close to each other, and the upper surface of each second movable block (42) is lower than the upper surface of the first substrate (1) and the second substrate (2). Each second movable block (42) has a vertically extending groove (8) on its upper surface. A baffle (9) is movably embedded in the groove (8) and connected to the piston rod of a cylinder (10). When the baffle (9) moves to the first position with the cylinder (10), its upper surface is flush with the upper surface of the first substrate (1) and the second substrate (2). When the baffle (9) moves to the second position with the cylinder (10), its upper surface is higher than the upper surface of the first substrate (1) and the second substrate (2). Each of the two ends of the strip-shaped through hole (3) and on the lower surface of the first substrate (1) and the second substrate (2) is equipped with a limiting housing (14) with an internal receiving groove (141). The bottom of the receiving groove (141) of each limiting housing (14) is provided with several elastic support members (16) extending in the vertical direction. One end of a metal sheet (15) is embedded in the limiting housing (14) and connected to the upper end of the elastic support member (16). The other end of the metal sheet (15) is detachably connected to the first movable block (41) or the second movable block (42) in the strip-shaped through hole (3) and slides in cooperation with the inner wall of the strip-shaped through hole (3).

2. The CNC machine tool according to claim 1, characterized in that: The cutting tool assembly (23) further includes: a housing (17) and a first cutting head (181) and a second cutting head (182) respectively corresponding to the first substrate (1) and the second substrate (2). The upper ends of the first cutting head (181) and the second cutting head (182) extending outward from the housing (17) are each mounted in a support block (20) disposed in the housing (17) via a tool holder (19). Each of the two support blocks (20) rotatably mounted in the housing (17) is equipped with a synchronous pulley (241) at one end. The two synchronous pulleys (241) are connected by a synchronous belt (242). A motor (25) that is connected to any one of the support blocks (20) is mounted on the upper surface of the housing (17).

3. The CNC machine tool according to claim 2, characterized in that: A guide groove (261) for inserting a tool holder (19) is provided on the lower end surface of the strip-shaped support block (20). A sliding rod (262) is installed on the upper end of the tool holder (19) which is movably inserted into the guide groove (261). The two ends of the sliding rod (262) extend outward from the strip-shaped grooves (263) on the two side surfaces of the support block (20) and slide in cooperation with the corresponding strip-shaped grooves (263). A hydraulic rod (27) is installed on one side surface of the support block (20) and above the sliding rod (262). The lower end of the hydraulic rod (27) is connected to one end of the sliding rod (262).

4. The CNC machine tool according to claim 3, characterized in that: The piston rod of the hydraulic rod (27) is connected to the sliding rod (262) via a hinge (28).

5. The CNC machine tool according to claim 1, characterized in that: The metal sheet (15) is magnetically connected to the first movable block (41) and the second movable block (42).

6. The CNC machine tool according to claim 1, characterized in that: The elastic support (16) is always in a stretched state.

7. The CNC machine tool according to claim 1, characterized in that: On the first substrate (1) and the second substrate (2), a guide groove (151) is provided on the outer side of both ends of the strip-shaped through hole (3) to slide with the metal sheet (15).

8. The CNC machine tool according to claim 7, characterized in that: The guide groove (151), which is connected to the strip-shaped through hole (3) and the receiving groove (141) at both ends, is an arc-shaped guide groove.

9. The CNC machine tool according to claim 1, characterized in that: The inner wall of the strip-shaped through hole (3) is provided with guide grooves (152) for embedding at the two sides of the metal sheet (15).

10. The machine base of the CNC machine tool according to claim 1, characterized in that: The lower surface of the first substrate (1) and the second substrate (2) is provided with a guide rail (7) on the other side of the strip-shaped through hole (3). The lower ends of the first movable block (41) and the second movable block (42) are movably connected to the corresponding guide rail (7) through a second connecting block (62).

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