A four-axis linkage numerical control machine tool for processing the upper cover of a reaction kettle

Abstract

The application relates to the technical field of numerical control machine tools, and discloses a four-axis linkage type numerical control machine tool for machining the upper cover of a reaction kettle, which comprises a machine tool main body, a workbench is arranged in the machining bin of the machine tool main body, a supporting mechanism is arranged on the upper portion of the workbench, the supporting mechanism comprises a low-carbon steel sheet, the bottom of the low-carbon steel sheet is rotationally connected to one end of an adaptive rod, the lower portion of the adaptive rod is slidingly connected to a through hole formed in the interior of an electromagnetic shell, array chambers are formed in the central portion of the electromagnetic shell, an electromagnetic monomer is slidingly arranged in the array chambers, a first hydraulic chamber is in communication with and fixedly connected to the bottom of the electromagnetic shell, a fixed base is fixedly connected to the bottom of the first hydraulic chamber, a second hydraulic chamber is in communication with and fixedly connected to one side of the first hydraulic chamber, a piston block is sealingly and slidingly connected in the interior of the second hydraulic chamber, a top block is arranged above the two sides of the second hydraulic chamber and fixedly connected to the side wall of the electromagnetic shell, the supporting mechanism is convenient to install and greatly improves the machining efficiency.

Description

Technical Field

[0001] This invention relates to the field of CNC machine tool technology, specifically a four-axis linkage CNC machine tool for machining the top cover of a reaction vessel. Background Technology

[0002] During the machining of reactor lids, especially for large or high-pressure reactors, in order to perform precision machining such as turning, milling, or drilling, it is necessary to stably fix them on the worktable and prevent deformation during thin-wall machining. Therefore, auxiliary support mechanisms are required for reinforcement.

[0003] Most existing auxiliary support mechanisms adopt contour-following support components, using a set of adjustable mechanical pillars. The height of each support point is precisely adjusted manually or by CNC to ensure a tight fit with the irregular lower surface of the reactor cover flange, thereby providing uniform support force. Each support point requires careful manual measurement and adjustment by skilled workers. For large flanges, there may be dozens or even hundreds of support points. This process takes several hours or even days, seriously consuming valuable machine tool processing time.

[0004] In view of this, the present invention proposes a four-axis linkage CNC machine tool for machining the top cover of a reaction vessel, so as to solve the problems existing in the prior art. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a four-axis linkage CNC machine tool for machining the top cover of a reaction vessel.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A four-axis linkage CNC machine tool for machining the top cover of a reaction vessel includes a machine tool body, a worktable installed in the machining chamber of the machine tool body, and a support mechanism installed on the upper part of the worktable;

[0008] The support mechanism includes a low-carbon steel sheet, the bottom of which is rotatably connected to one end of an adaptive rod. The lower part of the adaptive rod is slidably connected to a through hole inside the electromagnetic housing. An array chamber is arrayed in the center of the electromagnetic housing. An electromagnetic unit is slidably installed inside the array chamber. A first hydraulic chamber is connected and fixedly connected to the bottom of the electromagnetic housing. A fixed base is fixedly connected to the bottom of the first hydraulic chamber. A second hydraulic chamber is connected and fixedly connected to one side of the first hydraulic chamber. A piston block is slidably connected and sealed inside the second hydraulic chamber. Top blocks are provided on the upper sides of the second hydraulic chamber and fixedly connected to the side wall of the electromagnetic housing.

[0009] Preferably, the adaptive rod includes a flexible rod with a ball head at the top and rotatably connected to the bottom of a low-carbon steel sheet. The bottom of the flexible rod has a first limiting end and is slidably engaged with the inside of the top of a sliding column. A first spring is installed between the bottom of the first limiting end and the cavity formed inside the sliding column. The sliding column is slidably connected through the through hole.

[0010] Preferably, the electromagnetic unit includes an electromagnetic rod, a piston rod is fixedly connected to the bottom of the electromagnetic rod, a second limiting end is provided at the bottom end of the piston rod, and the piston rod is slidably and sealed to the lower part of the array chamber.

[0011] Preferably, the electromagnetic unit is provided with electromagnetic rod partitions, the electromagnetic rod partitions including a central electromagnetic rod, an inner adjacent electromagnetic rod, an inner corner electromagnetic rod, an outer central electromagnetic rod, and an outer corner electromagnetic rod. The four sidewalls of the upper part of the central electromagnetic rod have sliding grooves. The inner adjacent electromagnetic rod has a protrusion on its central sidewall, and the other three sidewalls of the inner adjacent electromagnetic rod have sliding grooves. The inner corner electromagnetic rod has a protrusion on its inner sidewall, and the inner corner electromagnetic rod has a sliding groove on its outer sidewall. The outer wall of the clamping electromagnetic rod is fixed to the side wall of the sliding column via a connecting block. The outer ring clamping electromagnetic rod has protrusions on its side wall facing the inner ring and the central axis. The remaining side wall of the outer ring clamping electromagnetic rod has a sliding groove. The outer wall of the outer ring center electromagnetic rod is fixed to the side wall of the sliding column via a connecting block. The outer ring center electromagnetic rod has a protrusion on its side wall facing the inner ring. The remaining two side walls of the outer ring center electromagnetic rod have sliding grooves. The two outer walls of the outer ring corner electromagnetic rod are fixed to the side wall of the sliding column via connecting blocks. The remaining two side walls of the outer ring corner electromagnetic rod have protrusions.

[0012] Preferably, the protrusion is slidably connected to the inside of the slide groove, and both the protrusion and the connecting block are slidably connected to the inside of the slide groove opened inside the electromagnetic housing.

[0013] Preferably, the top of the piston block is fixed to the bottom of the limiting post, the top of the limiting post slides through the middle of the limiting block and is fixedly connected to a locking mechanism, a second spring is sleeved on the outside of the limiting post, the second spring abuts against the bottom of the limiting block and the top of the piston block respectively, the two sides of the limiting block are fixed to the side wall of the second hydraulic chamber, and the top of the second hydraulic chamber is in an open state.

[0014] Preferably, the locking mechanism includes a locking pin, the bottom end of which is fixed to the top of the piston block, the top of which slides through the middle of the limiting block and is fixed to the bottom of the T-shaped block, the top of the T-shaped block is provided with a slide rail, and sliders are symmetrically slidably connected to both sides of the slide rail, the inner end of the slider is hinged to one end of a connecting rod, the other end of the connecting rod is hinged to the output end of a hydraulic cylinder, the hydraulic cylinder is fixed to the top of the T-shaped block, and the input end of the hydraulic cylinder is connected to a pump through a hydraulic pipe.

[0015] Preferably, the fixed base has a hollow structure inside and an opening at the bottom, and a limiting circular block is movably placed inside the fixed base.

[0016] Preferably, the workbench array has a through-hole for positioning, and a screw is slidably installed in the positioning hole. The tip of the screw passes through the positioning hole and the opening in sequence and is threaded to the center of the limiting block.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] The present invention discloses a four-axis linkage CNC machine tool for machining reactor lids. By setting up a support mechanism, with the cooperation of structures such as low-carbon steel sheet, self-adaptive rod, electromagnetic unit, electromagnetic shell, first hydraulic chamber, and second hydraulic chamber, the low-carbon steel sheet can initially fit the inner surface of the workpiece to be machined. The electromagnetic unit provides magnetic assisted support, which changes the previous troublesome need to constantly adjust each support point according to different shaped workpieces, and greatly improves the machining efficiency.

[0019] The present invention provides a four-axis linkage CNC machine tool for processing reactor lids. By setting a locking mechanism, the electromagnetic unit can be stopped at any position under the drive of a hydraulic cylinder, which further improves the adaptability to different types of workpieces to be processed.

[0020] The present invention provides a four-axis linkage CNC machine tool for machining the top cover of a reaction vessel. By setting a fixed base, multiple support mechanisms can be quickly fixed and used, and small-range fine adjustments can be made, thereby further improving the machining accuracy. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a three-dimensional view of the structure of the present invention;

[0023] Figure 2 This is a three-dimensional view of the support mechanism structure of the present invention;

[0024] Figure 3This is an enlarged three-dimensional view of the structure at point A of the present invention;

[0025] Figure 4 This is a three-dimensional half-section view of one side of the support mechanism of the present invention;

[0026] Figure 5 This is a three-dimensional view of the adaptive rod structure of the present invention;

[0027] Figure 6 This is a three-dimensional view of the electromagnetic unit array structure of the present invention;

[0028] Figure 7 This is a three-dimensional half-section view of the electromagnetic shell of the present invention.

[0029] In the diagram: 10 Machine tool body, 20 Worktable, 21 Positioning hole, 30 Support mechanism, 31 Low carbon steel flexible sheet, 32 Adaptive rod, 321 Flexible rod, 3211 First limiting end, 3212 Ball head, 322 First spring, 323 Sliding column, 33 Electromagnetic housing, 331 Array chamber, 332 Through hole, 333 Slide rail, 34 Electromagnetic unit, 341 Electromagnetic rod, 342 Piston column, 343 Second limiting end, 344 Slide groove, 345 Protrusion, 346 Connecting block, 3400 Electromagnetic rod partition, 3401 Central area electromagnetic rod, 34 02 Inner ring adjacent area electromagnetic rod, 3403 Inner ring end corner area electromagnetic rod, 3404 Outer ring clamping area electromagnetic rod, 3405 Outer ring center area electromagnetic rod, 3406 Outer ring end corner area electromagnetic rod, 35 First hydraulic chamber, 36 Fixed base, 361 Opening, 37 Limiting round block, 38 Screw, 39 Top block, 310 Second hydraulic chamber, 311 Piston block, 312 Limiting post, 313 Second spring, 314 Limiting block, 40 Locking mechanism, 41 T-block, 411 Slide rail, 42 Slider, 43 Connecting rod, 44 Hydraulic cylinder, 45 Liquid pipe. Detailed Implementation

[0030] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0031] Please see Figure 1-7This invention relates to a four-axis linkage CNC machine tool for machining the top cover of a reaction vessel, comprising a machine tool body 10, a worktable 20 installed in the machining chamber of the machine tool body 10, a support mechanism 30 installed on the upper part of the worktable 20, the support mechanism 30 including a low-carbon steel flexible sheet 31, the bottom of the low-carbon steel flexible sheet 31 being rotatably connected to one end of an adaptive rod 32, the lower part of the adaptive rod 32 being slidably connected to a through hole 332 opened inside an electromagnetic housing 33, an array chamber 331 arrayed in the center of the electromagnetic housing 33, an electromagnetic unit 34 slidably installed inside the array chamber 331, a first hydraulic chamber 35 being connected and fixedly connected to the bottom of the electromagnetic housing 33, a fixed base 36 being fixedly connected to the bottom of the first hydraulic chamber 35, and a second hydraulic chamber 310 being connected and fixedly connected to one side of the first hydraulic chamber 35. The second hydraulic chamber 310 is internally sealed and slidably connected with a piston block 311. Top blocks 39 are provided on both sides of the second hydraulic chamber 310 and fixed to the side wall of the electromagnetic housing 33. It should be noted that both the first hydraulic chamber 35 and the second hydraulic chamber 310 are filled with hydraulic fluid and the surfaces are at the same height. By abutting the inner wall of the reactor lid against the upper surface of the low carbon steel sheet 31, the low carbon steel sheet 31 bends along the arc of the inner wall of the reactor lid, thereby driving the adaptive rod 32 to move, so that the electromagnetic unit 34 moves up and down accordingly. This makes the distance between the electromagnetic unit 34 and the low carbon steel sheet 31 relatively constant, so that the magnetic support of the electromagnetic unit 34 on the low carbon steel sheet 31 is relatively uniform and there will be no large difference in support force due to the height difference of the arc surface.

[0032] Please see Figure 5-7 The adaptive rod 32 includes a flexible rod 321. The top of the flexible rod 321 has a ball head 3212 and is rotatably connected to the bottom of the low-carbon steel flexible sheet 31. The bottom of the flexible rod 321 has a first limiting end 3211 and is slidably engaged inside the top of the sliding column 323. A first spring 322 is installed between the bottom of the first limiting end 3211 and the cavity formed inside the sliding column 323. The sliding column 323 is slidably connected through the through hole 332. When the low-carbon steel flexible sheet 31 deforms along with the surface of the workpiece, it should be noted that the energizing wires of the electromagnetic unit 34 are embedded in the bottom of the adaptive rod 32 and connected to... Block 346, protrusion 345 and slide groove 344 are embedded and connected, so that electromagnetic unit 34 can be energized and work. First, the first spring 322 is compressed to the bottom, and then the slide column 323 is moved downward. At the same time, the soft rod 321 will bend along with the deformation of the low carbon steel soft sheet 31. This process is only a preliminary fixation of the low carbon steel soft sheet 31. At this time, there is still a certain gap between the low carbon steel soft sheet 31 and the workpiece to be processed. At this time, energizing the electromagnetic rod will cause the low carbon steel soft sheet 31 to continue to move upward a distance and fit against the workpiece to be processed. At this time, the soft rod 321 can extend a distance.

[0033] Please see Figure 6 and 7The electromagnetic unit 34 includes an electromagnetic rod 341, and a piston column 342 is fixedly connected to the bottom of the electromagnetic rod 341. The bottom end of the piston column 342 is provided with a second limiting end 343. The piston column 342 is slidably connected to the lower part of the array chamber 331. When the electromagnetic unit 34 is driven to move downward by the adaptive rod 32, the piston column 342 moves downward and enters the first hydraulic chamber 35, so that the liquid in the first hydraulic chamber 35 is squeezed into the second hydraulic chamber 310.

[0034] Please see Figure 6 The electromagnetic unit 34 is provided with electromagnetic rod partitions 3400, which include a central electromagnetic rod 3401, an inner adjacent electromagnetic rod 3402, an inner corner electromagnetic rod 3403, an outer middle electromagnetic rod 3404, an outer central electromagnetic rod 3405, and an outer corner electromagnetic rod 3406. The four side walls of the upper part of the central electromagnetic rod 3401 have grooves 344. The inner adjacent electromagnetic rod 3402 has a protrusion 345 facing the central side wall, and the other three side walls of the inner adjacent electromagnetic rod 3402 have grooves 344. The inner corner electromagnetic rod 3403 has a protrusion 345 facing the inner side wall, and a groove 344 facing the outer side wall. The outer side wall of the outer middle electromagnetic rod 3404 is fixed to the side wall of the sliding column 323 via a connecting block 346. The inner ring and the side wall facing the central axis are provided with protrusions 345. The remaining side wall of the outer ring clamping middle area electromagnetic rod 3404 is provided with a sliding groove 344. The outer side wall of the outer ring central area electromagnetic rod 3405 is fixed to the side wall of the sliding column 323 through a connecting block 346. The outer ring central area electromagnetic rod 3405 is provided with a protrusion 345 facing the inner ring side wall. The remaining two side walls of the outer ring central area electromagnetic rod 3405 are provided with sliding grooves 344. The two outer side walls of the outer ring end corner area electromagnetic rod 3406 are fixed to the side wall of the sliding column 323 through a connecting block 346. The remaining two side walls of the outer ring end corner area electromagnetic rod 3406 are provided with protrusions 345. By setting up mutually cooperating and connected electromagnetic units 34, the movement of the outer ring electromagnetic unit 34 will drive the inner ring electromagnetic unit 34 to move step by step, thereby forming a progressive slope shape, so that the distance between the top of the electromagnetic rod 3403 and the low carbon steel flexible sheet 31 is relatively constant.

[0035] Please see Figure 6 and 7The protrusion 345 is slidably connected to the inside of the slide groove 344. The protrusion 345 and the connecting block 346 are both slidably connected to the inside of the slide track 333 opened inside the electromagnetic housing 33. It should be noted that the initial position of all the protrusions 345 is at the top of the slide groove 344. The length of the slide groove 344 is sufficient to allow the electromagnetic units 34 to form a stepped arrangement. Through the cooperation of the protrusions 345 and the slide groove 344, the outer ring electromagnetic units 34 can move step by step to drive the inner ring electromagnetic units 34 to move, thereby forming a stepped arrangement to accommodate the newly modified low carbon steel sheet 31.

[0036] Please see Figure 4 The top of the piston block 311 is fixed to the bottom of the limiting post 312. The top of the limiting post 312 slides through the middle of the limiting block 312 and is fixed to the locking mechanism 40. A second spring 313 is sleeved on the outside of the limiting post 312. The second spring 313 abuts against the bottom of the limiting block 314 and the top of the piston block 342 respectively. The two sides of the limiting block 314 are fixed to the side walls of the second hydraulic chamber 310. The top of the second hydraulic chamber 310 is in an open state. When the electromagnetic unit 34 moves downward into the first hydraulic chamber 35, it presses the liquid in the first hydraulic chamber 35 into the second hydraulic chamber 310, thereby driving the piston block 311 to move upward and compress the second spring 313. When the processing is completed, the second spring 313 deforms and rebounds, thereby pushing the piston block 311 to move downward, thereby causing the electromagnetic unit 34 to reset upward.

[0037] Please see Figure 2 and 3 The locking mechanism 40 includes a T-shaped block 41. The bottom of the T-shaped block 41 is fixed to the top of the limiting post 312. The top of the T-shaped block 41 is provided with a slide rail 411. Slider blocks 42 are symmetrically slidably connected to both sides of the slide rail 411. The inner end of the slider 42 is hinged to one end of the connecting rod 43. The other end of the connecting rod 43 is hinged to the output end of the hydraulic cylinder 44. The hydraulic cylinder 44 is fixed to the top of the T-shaped block 41. The input end of the hydraulic cylinder 44 is connected to a pump through a liquid pipe 45. Before the electromagnetic unit 34 is energized, the output end of the hydraulic cylinder 44 can be extended, thereby driving the connecting rod 43 to move, thereby driving the slider 42 to move along the slide rail 411. Then, one end of the slider 42 is squeezed and braked by the top block 39, and finally the position of the electromagnetic unit 34 is fixed.

[0038] Please see Figure 2 and 4 The fixed base 36 has a hollow structure inside and an opening 361 at the bottom. A limiting block 37 is movably placed inside the fixed base 36. It should be noted that the diameter of the limiting block 37 is larger than the diameter of the opening 361, and there is enough room for it to move inside the fixed base 36.

[0039] Please see Figure 1 and 4The workbench 20 has a through-hole 21. A screw 38 is slidably installed in the positioning hole 21. The tip of the screw 38 passes through the positioning hole 21 and the opening 361 in sequence and is threaded to the center of the limiting block 37. It should be noted that the diameter of the screw 38 used here is smaller than that of the opening 361, so that the fixed base 36 can be moved slightly before the screw 38 is tightened to achieve a suitable support position.

[0040] Working principle: When using the CNC machine tool with this technical solution, firstly, according to the required support position of the workpiece, place the support mechanism 30 of this solution in a suitable position on the worktable 20, and tighten the screws 38 through the positioning hole 21 and the opening 361 from the bottom of the worktable 20 and thread them onto the limiting block 37. Before tightening the screws 38, the fixed base 36 can be moved slightly to achieve a suitable support position. Then, the workpiece is placed on the worktable 20 and fixed. When the inner surface of the workpiece contacts the upper surface of the low-carbon steel sheet 31, the low-carbon steel sheet 31 follows the reaction vessel upwards. The inner wall of the cover is curved, which in turn causes the adaptive rod 32 to move, so that the electromagnetic unit 34 moves downward and the piston rod 342 enters the first hydraulic chamber 35, which presses the liquid in the first hydraulic chamber 35 into the second hydraulic chamber 310, thereby causing the piston block 342 to move upward and compress the second spring 313. At this time, the hydraulic cylinder 44 is activated to extend its output end, which in turn causes the connecting rod 43 to move, which in turn causes the slider 42 to move along the slide rail 411. Then, one end of the slider 42 is squeezed and braked by the top block 39, which finally fixes the position of the electromagnetic unit 34.

[0041] In the description of this invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0042] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A four-axis linkage CNC machine tool for machining the top cover of a reaction vessel, characterized in that: Includes a machine tool body (10), a worktable (20) is installed in the processing chamber of the machine tool body (10), and a support mechanism (30) is installed on the upper part of the worktable (20). The support mechanism (30) includes a low-carbon steel sheet (31), the bottom of which is rotatably connected to one end of an adaptive rod (32). The lower part of the adaptive rod (32) is slidably connected to a through hole (332) inside the electromagnetic housing (33). An array chamber (331) is arrayed in the center of the electromagnetic housing (33). An electromagnetic unit (34) is slidably installed inside the array chamber (331). A first hydraulic chamber (35) is connected and fixed to the bottom of the electromagnetic housing (33). A fixed base (36) is fixed to the bottom of the first hydraulic chamber (35). A second hydraulic chamber (310) is connected and fixed to one side of the first hydraulic chamber (35). A piston block (311) is slidably connected and sealed inside the second hydraulic chamber (310). Top blocks (39) are provided on the upper sides of the second hydraulic chamber (310). The top blocks (39) are fixed to the side wall of the electromagnetic housing (33). The adaptive rod (32) includes a soft rod (321), the top of the soft rod (321) is provided with a ball head (3212) and is rotatably connected to the bottom of the low carbon steel soft sheet (31), the bottom end of the soft rod (321) is provided with a first limiting end (3211) and is slidably locked inside the top of the sliding column (323), a first spring (322) is installed between the bottom of the first limiting end (3211) and the cavity formed inside the sliding column (323), and the sliding column (323) is slidably connected through the through hole (332); The electromagnetic unit (34) includes an electromagnetic rod (341), a piston column (342) is fixedly connected to the bottom of the electromagnetic rod (341), a second limiting end (343) is provided at the bottom end of the piston column (342), and the piston column (342) is sealed and slidably connected to the lower part of the array chamber (331). The electromagnetic unit (34) is provided with electromagnetic rod partitions (3400), the electromagnetic rod partitions (3400) include a central electromagnetic rod (3401), an inner ring adjacent electromagnetic rod (3402), an inner ring corner electromagnetic rod (3403), an outer ring sandwich electromagnetic rod (3404), an outer ring central electromagnetic rod (3405), and an outer ring corner electromagnetic rod (3406). The four side walls of the upper part of the central electromagnetic rod (3401) are provided with grooves (344). The inner ring adjacent electromagnetic rod (3402) has a protrusion (345) facing the central side wall. The other three side walls of the inner ring adjacent electromagnetic rod (3402) are provided with grooves (344). The inner ring corner electromagnetic rod (3403) has a protrusion (345) facing the inner ring side wall. The inner ring corner electromagnetic rod (3403) has a groove (344) facing the outer ring side wall. The outer wall of the clamping zone electromagnetic rod (3404) is fixedly connected to the side wall of the sliding column (323) via a connecting block (346). The outer ring clamping zone electromagnetic rod (3404) has protrusions (345) on the side wall facing the inner ring and the central axis. The remaining side wall of the outer ring clamping zone electromagnetic rod (3404) has a sliding groove (344). The outer wall of the outer ring center zone electromagnetic rod (3405) is fixedly connected to the side wall of the sliding column (323) via a connecting block (346). The outer ring center zone electromagnetic rod (3405) has protrusions (345) on the side wall facing the inner ring. The remaining two side walls of the outer ring center zone electromagnetic rod (3405) have sliding grooves (344). The two outer walls of the outer ring corner zone electromagnetic rod (3406) are fixedly connected to the side wall of the sliding column (323) via a connecting block (346). The remaining two side walls of the outer ring corner zone electromagnetic rod (3406) have protrusions (345). The protrusion (345) is slidably connected to the inside of the slide groove (344), and both the protrusion (345) and the connecting block (346) are slidably connected to the inside of the slide (333) opened inside the electromagnetic housing (33). The piston block (311) is fixed to the bottom of the limiting post (312) at the top. The limiting post (312) slides through the middle of the limiting block (314) and is fixed to a locking mechanism (40). A second spring (313) is sleeved on the outside of the limiting post (312). The second spring (313) abuts against the bottom of the limiting block (314) and the top of the piston block (311) at the top and bottom respectively. The limiting block (314) is fixed to the side wall of the second hydraulic chamber (310) on both sides. The top of the second hydraulic chamber (310) is in an open state. The locking mechanism (40) includes a T-shaped block (41), the bottom of which is fixed to the top of the limiting post (312). The top of the T-shaped block (41) is provided with a slide rail (411). Slider blocks (42) are symmetrically slidably connected on both sides of the slide rail (411). The inner end of the slider (42) is hinged to one end of the connecting rod (43). The other end of the connecting rod (43) is hinged to the output end of the hydraulic cylinder (44). The hydraulic cylinder (44) is fixed to the top of the T-shaped block (41). The input end of the hydraulic cylinder (44) is connected to a pump through a liquid pipe (45).

2. The four-axis linkage CNC machine tool for machining the top cover of a reaction vessel as described in claim 1, characterized in that: The fixed base (36) has a hollow structure inside and an opening (361) at the bottom. A limiting block (37) is movably placed inside the fixed base (36).

3. The four-axis linkage CNC machine tool for machining the top cover of a reaction vessel as described in claim 1, characterized in that: The workbench (20) array has a through-hole (21), and a screw (38) is slidably installed in the through-hole (21). The tip of the screw (38) passes through the through-hole (21) and the opening (361) in sequence and is threaded to the center of the limiting block (37).

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