Machine tool for processing inner cavity of metal reflector of nuclear power plant

Abstract

This invention relates to a dedicated machine tool for machining the inner cavity of a nuclear power plant's metal reflector layer. It includes a main machine, a rotary table, an outer gantry, clamping fixtures, and a recovery mechanism. The main machine includes an inner column, a crossbeam, and a tool post. A universal milling head with a milling cutter disc is mounted at the front end of the tool post. The main machine is connected to the rotary table. The rotary table is driven by two sets of power mechanisms and uses a circular grating for precise positioning at 0°, 90°, 180°, and 270°. Clamping cylinders achieve locking. The outer gantry is located on both sides of the main machine, with a movable crossbeam at the top. Locking cylinders lock the outer gantry to the movable crossbeam, and the movable crossbeam to the inner column. The clamping fixture includes a workpiece platform, chucks, a waist clamp platform, and locating pins for workpiece positioning. The machine tool is also equipped with a chip and cutting fluid recovery mechanism. This invention solves the technical problems of vibration, insufficient accuracy, and low efficiency that occur when using conventional machine tools, achieving the machining and accuracy requirements for the inner cavity shape of the metal reflector layer.

Description

Technical Field

[0001] This invention relates to a special machine tool for machining the inner cavity of the metal reflector layer of a nuclear power plant, belonging to the field of machine tool technology. Background Technology

[0002] The metal reflector of nuclear power reactors in civilian nuclear projects such as AP1000, Hualong One, and CAP1400 is a cylindrical part with the machined surface located in the inner cavity of the part. It is mainly made of steel plates welded together, and the material is austenitic stainless steel. The cross-section is a closed area. The machined surface of the inner cavity is a stepped plane evenly distributed in four directions about the center. The inscribed circle of the cross-section space is about 3000mm, and the height of the machined surface is about 4800mm.

[0003] The machining accuracy requirements for each machined surface of the inner cavity of the metal reflector layer of a nuclear power plant are as follows: the flatness of the entire length is not greater than 2.1 mm, the flatness within any 300 mm range is not greater than 1.2 mm, the roughness is better than 3.2 μm, the single-side width of the inner cavity dimension tolerance zone is 2 mm, and the workpiece shall not be deformed due to cutting heat.

[0004] The difficulty in processing the above-mentioned workpieces lies in the fact that conventional CNC gantry milling machines, CNC vertical lathes, and CNC boring and milling machines cannot meet the processing requirements in terms of processing range and processing efficiency. At the same time, the thickness of the inner cavity after machining is about 25.4mm, which is a thin-walled part. Vibration is easily generated during processing, which affects the processing accuracy. There are certain requirements for the positioning and clamping of the workpiece. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies and the precision and technical requirements for workpiece processing by providing a special machine tool for machining the inner cavity of the metal reflective layer of a nuclear power plant. This machine tool can rotate 90 degrees four times, clamps the workpiece only once, and processes it in four stages, machining one-quarter each time, thereby completing the machining of all surfaces of the inner cavity of the metal reflective layer. This overcomes the defects of existing technologies and meets the requirements for machining precision.

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

[0007] A special machine tool for machining the inner cavity of the metal reflector layer of a nuclear power plant includes a main unit, a rotary worktable, an outer gantry, a clamping device, and a recovery mechanism. The main unit includes an inner column, a crossbeam, and a tool post. A universal milling head with a milling cutter disc is mounted at the front end of the tool post. The traversing mechanism and the tool post are mounted on the crossbeam. The entire main unit is connected to the rotary worktable. The rotary worktable employs two sets of drive mechanisms. A circular grating capable of precise positioning at 0°, 90°, 180°, and 270° is installed in the rotary worktable. A [further details about the machine tool are missing from the original text.] The machine tool is equipped with a clamping cylinder for locking the worktable, and the worktable also has an annular T-slot for engaging the clamping cylinder head. The outer gantry is symmetrically arranged on both sides of the main machine, with a moving crossbeam and transmission mechanism at its top. The outer gantry is equipped with a locking mechanism to lock the outer gantry to the moving crossbeam, and a clamping mechanism to lock the moving crossbeam to the inner column. The clamping device includes a workpiece platform, a waist hoop platform, and chucks, with positioning pins to facilitate workpiece positioning and clamping. A chip and cutting fluid recovery mechanism is provided at the bottom of the machine tool.

[0008] Furthermore, the inner columns are arranged vertically, with left and right columns, and a crossbeam between them. The crossbeam has a U-shaped groove (the purpose of the U-shaped groove is to effectively utilize space, compact the machine tool's volume, and reduce its weight). The tops of the left and right columns are connected to the gantry top, and the bottoms are connected to the lower connecting beam. The inner columns are mounted on the worktable, and lifting piles are installed on both sides of the top of the left and right columns. Four sets of No. 1 linear guide rails are installed on the front and inner sides of the inner columns. A balance cylinder is installed on each side of the front plane of the inner columns, and the balance cylinders are connected to the crossbeam via brackets. The inner columns are equipped with… The system includes a lifting mechanism, which is divided into two groups, left and right, respectively housed in U-shaped grooves on the left and right columns. The lifting mechanism comprises a ball screw assembly (number I), a flange, a locking nut, a coupling, a reducer (number I), a servo motor (number I), a bearing (number I), a bearing housing, and an adjusting shim. The ball screw assembly (number I) is connected to the inner column via the bearing (number I) and bearing housing. The servo motor (number I) is connected to the reducer (number I). The reducer (number I) is installed in a pre-drilled hole in the top of the gantry via the adjusting shim. The output end of the reducer (number I) is connected to the ball screw (number I) via a coupling. The crossbeam is connected to the nut (number I) in the ball screw assembly (number I) via a nut housing.

[0009] Furthermore, the crossbeam can move up and down within the inner column, achieved by: mounting a No. I linear guide slider on the crossbeam that mates with the No. I linear guide rail on the inner column; and mounting No. I nut seats on both sides of the crossbeam that mate with the No. I ball screw pair; also mounting No. I inserts on both sides of the crossbeam, the No. I inserts being divided into eight groups (up, down, left, right, front, and back); the No. I inserts are assembled with the crossbeam; there is a No. I adjusting shim between the No. I inserts and the crossbeam; and a scraper is mounted on the No. I insert. A No. I flexible belt is positioned between the No. I inlay surface and the No. I flexible belt contacts the smooth inner surface of the inner column, forming a sliding pair. A walkway is installed at the front end of the crossbeam, and a drag chain bracket is installed at the rear end. A transverse movement mechanism is installed within the U-shaped groove of the crossbeam. This transverse movement mechanism is similar to a lifting mechanism. The No. II ball screw pair of the transverse movement mechanism is arranged parallel to the No. II servo motor. One side of the No. II ball screw pair is connected to the No. I synchronous pulley. The No. II servo motor is connected to the No. II reducer, which is mounted on a fixed support. Mounted on the crossbeam, the output end of reducer II is connected to the synchronous pulley of pair I. A cylindrical pin is provided on the support plate, and a cylindrical pin hole is provided on the slide block to mate with the cylindrical pin. The support plate and slide block are positioned by the cylindrical pin, and the support plate is connected to the slide block. The support plate is mounted above the crossbeam via a crossbeam pressure plate, forming a sliding pair. The crossbeam pressure plate is divided into left and right groups, connected to the support plate. A strip of type II is arranged between the support plate and the crossbeam. The strip of type II is divided into front and rear groups, and is connected to the support plate. There is a No. II adjusting pad between the pallets; No. III insert strips are arranged between the crossbeam and the crossbeam pressure plate. The No. III insert strips are divided into four groups in total, left, right, front and back. The No. III insert strips are connected to the crossbeam pressure plate. There is a No. III adjusting pad between the No. III insert strips and the crossbeam pressure plate. There is a No. II soft strip between the crossbeam and the No. II insert strips and the No. III insert strips, as well as between the crossbeam and the pallet contact surface. The bottom surface of the pallet is connected to the mounting plate. The mounting plate is connected to the No. II nut in the No. II ball screw pair, so as to realize the left and right movement of the tool holder.

[0010] Furthermore, the tool holder includes a slide, a feed box, a ram, a spindle, a spindle motor, and a universal milling head. The tool holder is fixedly connected to the support plate via the slide. The feed box includes a No. III ball screw assembly, a No. II bearing, a flange, a gasket, a protective cover, a No. III nut, a mounting bracket, a No. III reducer, and a No. III servo motor. The No. III ball screw assembly is fitted with the No. II bearing and the flange at the front and rear. The flange is connected to the gasket, and the No. III ball screw assembly is installed in the slide via the gasket. The front end of the No. III ball screw pair is equipped with a protective cover, and the rear end is connected to the No. III reducer and the No. III servo motor. The No. III reducer is connected to the mounting bracket, and the mounting bracket is connected to the pad. The ram is mounted above the slide block via a ram pressure plate to form a sliding pair. The ram pressure plate is connected to the slide block. A No. IV insert is arranged between the contact surfaces of the slide block and one side of the ram. The No. IV insert is divided into two groups, front and rear. The No. IV insert is connected to the slide block, and there is a No. IV adjusting shim between the No. IV insert and the slide block. The contact surfaces of the ram and the ram pressure plate... V-shaped inserts are arranged between the slide block and the slide ram pressure plate. These inserts are divided into four groups: front, back, left, and right. Each V-shaped insert connects to the slide ram pressure plate, and a V-shaped adjusting shim is placed between the insert and the pressure plate. A III-shaped soft strip is placed between the sliding block and the slide ram, and between the slide ram and the IV-shaped and V-shaped inserts. The bottom of the slide ram has a positioning hole that mates with the positioning shaft, and a II-shaped nut seat has a positioning groove that mates with the positioning shaft. The positioning shaft positions the II-shaped nut seat and the slide ram. After positioning, the II-shaped nut seat connects to the slide ram. The II-shaped nut seat and the III-shaped nut seat... The ball screw assembly is connected to nut III, enabling the slide to move back and forth. The main shaft is installed in the inner cavity of the slide. The front end of the main shaft is connected to a universal milling head via a custom interface. A milling cutter disc is installed on the universal milling head. A cutter cylinder is installed at the end of the main shaft. A synchronous pulley II is installed at the rear end of the main shaft. The output end of the gearbox is connected to synchronous pulley II. The gearbox and the main shaft motor are installed above the slide. A support is installed at the output end of the gearbox, and the support is connected to the slide. A protective cover for synchronous pulley II is installed on the support.

[0011] Furthermore, the rotary worktable has two sets of power drive mechanisms and a circular grating for precise positioning, as well as a clamping cylinder for locking the worktable. The circular grating is connected to a pad, the pad is connected to an upper pressure plate, and the upper pressure plate is connected to the main shaft of the worktable. The clamping cylinder includes an oil chamber, a piston, upper and lower cylinder covers, a sealing ring, a piston rod, a disc spring, and a pressure head. The upper end of the piston rod is connected to the pressure head, and the lower end is connected to the piston. One end of the piston is installed in the oil chamber. The disc spring and sealing ring are placed, and the upper and lower cylinder covers are installed. The clamping cylinder is installed on the base of the rotary worktable, and the pressure head is installed in the annular T-slot below the worktable. When the clamping cylinder is working, the pressure head moves down, and the worktable is locked.

[0012] Furthermore, the outer gantry is symmetrically arranged on both sides of the main unit, consisting of a left outer column and a right outer column, which are respectively connected to the load-bearing platforms of the left and right outer gantry columns; a movable crossbeam is provided at the top of the outer gantry, and a support pad is installed between the movable crossbeam and the outer gantry, as well as two sets of identical transmission mechanisms and locking mechanisms on each side, arranged symmetrically. The transmission mechanism includes a linear guide, a No. IV ball screw pair, a No. III synchronous pulley, a No. III secondary synchronous pulley, a No. IV reducer, a synchronous pulley tensioning mechanism, and a transmission shaft, wherein the No. II linear guide and the No. IV ball screw pair are... Connected to the outer gantry, the No. II linear guide slider is connected to the moving crossbeam. The No. IV nut in the No. IV ball screw pair is connected to the No. III synchronous pulley. The corresponding No. III synchronous pulley is connected to the output end of the No. IV reducer. The No. IV reducer is connected to the moving crossbeam. The synchronous pulley tensioning mechanism is mounted on the moving crossbeam. The drive shaft is connected to the input end of the No. IV reducer, and the other end of the drive shaft is connected to the output end of the distribution gearbox. The distribution gearbox is installed in the middle of the moving crossbeam, and the input end of the distribution gearbox is connected to the No. IV servo motor. The locking mechanism includes No. I... The system includes a locking cylinder, a cylinder support, and a locking pad. Locking cylinder I is mounted on the cylinder support, which is connected to the outer gantry. The locking pad is connected to the moving crossbeam. A clamping mechanism is also provided on the moving crossbeam to lock it to the inner column. This clamping mechanism includes a connecting plate, a cylinder seat, locking cylinder II, a clamping seat, locking cylinder III, a bushing, an end cap, a connecting seat, a limiting plate, a cylinder base plate, a cylinder, and an anti-rotation pin. The connecting plate is connected to the top of the upper gantry. The cylinder seat is mounted on the connecting plate, and locking cylinder II is mounted on the cylinder seat. A clamping pad is mounted on the clamping seat. Install No. III locking cylinder. The cylindrical end of the connecting seat is fitted with the bushing. The bushing and connecting seat are assembled in the clamping seat. A limiting plate is installed on the upper end of the clamping seat, and an end cap is installed on its lower end. The end cap is connected to the connecting seat installed in the inner cavity of the clamping seat. The connecting seat is connected to the moving crossbeam (the limiting plate and end cap restrict the connecting seat to a suitable position in the inner cavity of the clamping seat). The cylinder base plate is installed on the connecting seat, and the cylinder is installed on the cylinder base plate. The anti-rotation pin is installed on the cylinder. The clamping seat is provided with a pin hole that mates with the anti-rotation pin. There is a sliding groove between the connecting plate and the cylinder seat, which forms a moving pair with the clamping seat.

[0013] Furthermore, the clamping device includes a workpiece platform, jaws, and a waist hoop platform. The workpiece platform is provided with positioning pins that facilitate workpiece positioning and clamping, as well as T-slots for accommodating the jaws and waist hoop platform. The positioning pins are connected to the workpiece platform. The workpiece platform includes left and right workpiece support platforms and left and right outer gantry column support platforms. The left and right outer gantry column support platforms are connected to the left and right workpiece support platforms and are connected to the foundation by anchor bolts. There are ground anchors and adjusting shims between the workpiece platform and the foundation for leveling the workpiece platform. The top of the waist hoop platform is provided with a T-slot for installing jaws.

[0014] Furthermore, the recycling mechanism is arranged at the bottom of the machine tool and includes a chip recycling mechanism and a cutting fluid recycling mechanism. The chip recycling mechanism includes a chip conveyor and a hoist. The chip conveyor is arranged in a ring around the rotary table. One end of the hoist is located below the chip conveyor, and the other end is located above the ground. A chip collection trolley is located below the hoist at the end above the ground. The cutting fluid recycling mechanism includes a filter and a high-pressure pump. After the cutting fluid falls into the pit, it is filtered and pumped back to the machining area by the high-pressure pump for cooling the cutting tools and flushing away chips.

[0015] The problem solved by this invention is that conventional machine tools are difficult to use to process the inner cavity of a metal reflective layer, resulting in low processing efficiency, easy vibration during processing, and substandard accuracy.

[0016] The advantage of this invention is that it can complete the machining of all machining surfaces of the workpiece cavity in one clamping, thereby meeting the machining requirements and accuracy requirements of the inner cavity shape of the metal reflective layer. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the host structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal column structure of the present invention;

[0020] Figure 4 This is a schematic diagram of the lifting mechanism structure of the present invention;

[0021] Figure 5 This is a schematic diagram of the beam structure of the present invention;

[0022] Figure 6 This is a schematic diagram of the rear view of the beam structure of the present invention;

[0023] Figure 7 This is a schematic diagram of the crossbeam inlay structure of the present invention;

[0024] Figure 8 This is a schematic diagram of the tool holder structure of the present invention;

[0025] Figure 9 This is a schematic diagram of the internal structure of the tool holder of the present invention;

[0026] Figure 10 This is a schematic diagram of the rotary table structure of the present invention;

[0027] Figure 11 This is a schematic diagram of the circular grating of the present invention;

[0028] Figure 12 This is a schematic diagram of the clamping cylinder structure of the present invention;

[0029] Figure 13 This is a schematic diagram of the external gantry moving crossbeam structure of the present invention;

[0030] Figure 14 This is a schematic diagram of the clamping mechanism structure of the present invention;

[0031] Figure 15 This is a schematic diagram of the left-side view of the external gantry structure of the present invention;

[0032] Figure 16 This is a schematic diagram of the clamping device structure of the present invention;

[0033] Figure 17 This is a schematic diagram of the recycling mechanism of the present invention.

[0034] Wherein: 1-Main unit; 2-Inner column; 3-Left column; 4-Right column; 5-Gantry top; 6-Lower connecting beam; 7-Lifting pile; 8-No. I linear guide rail; 9-Balance cylinder; 10-Bracket; 11-Lifting mechanism; 12-No. I ball screw pair; 13-Flange; 14-Locking nut; 15-Coupling; 16-No. I reducer; 17-No. I servo motor; 18-No. I bearing; 19-Bearing seat; 20-Adjusting shim; 21-Adjusting plate; 22-No. I nut; 23-Crossbeam; 24-No. I linear guide slider; 25-No. I nut seat; 26-No. I insert; 27-No. I adjusting shim; 28-Scraper plate; 29-No. I soft belt; 30-Walkway; 31-Drag chain bracket; 32-Transverse movement mechanism; 33-No. II Ball screw assembly; 34-Servo motor II; 35-Synchronous pulley I; 36-Reducer II; 37-Fixed support; 38-Synchronous belt I; 39-Cylindrical pin; 40-Support plate; 41-Crossbeam pressure plate; 42-Insertion II; 43-Adjusting shim II; 44-Insertion III; 45-Adjusting shim III; 46-Soft belt II; 47-Mounting plate; 48-Nut II; 49-Tool post; 50-Slide; 51-Feed box; 52-Roller; 53-Spindle; 54-Spindle motor; 55-Universal milling head; 56-Ball screw assembly III; 57-Bearing II; 58-Flange; 59-Plate; 60-Guard cover; 61-Nut III; 62-Mounting support; 63 - Reducer III; 64- Servo Motor III; 65- Slide Plate; 66- Inlay IV; 67- Adjusting Shim IV; 68- Inlay V; 69- Adjusting Shim V; 70- Soft Belt III; 71- Positioning Shaft; 72- Nut Seat II; 73- Milling Cutter Disc; 74- Tool-Clamping Cylinder; 75- Secondary Synchronous Belt Pulley II; 76- Gearbox; 77- Synchronous Belt Pulley II; 78- Support; 79- Protective Cover for Synchronous Belt Pulley II; 80- Rotary Worktable; 81- Drive Mechanism; 82- Circular Grating; 83- Worktable; 84- Clamping Cylinder; 85- Pad Block; 86- Upper Platen; 87- Worktable Spindle; 88- Oil Chamber; 89- Piston; 90- Upper and Lower Cylinder Heads; 91- Sealing Ring; 92- Liver 93-Plug rod; 94-Disc spring; 95-Pressure head; 96-Base; 97-Outer gantry; 98-Left outer column; 99-Right outer column; 100-Left and right outer gantry column support platform; 101-Moving crossbeam; 102-Support pad; 103-Transmission mechanism; 104-Locking mechanism; 105-Linear rail; 106-No. IV ball screw pair; 107-No. III synchronous pulley; 108-No. III auxiliary synchronous pulley; 109-No. IV reducer; 110-Synchronous pulley tensioning mechanism; 111-Drive shaft; 112-No. II linear rail guide; 113-No. II linear rail slider; 114-No. IV nut; 115-Distribution gearbox; 116-No. IV servo motor; 117-No. I locking cylinder; 118-Cylinder support;118-Locking pad; 119-Clamping mechanism; 120-Connecting plate; 121-Cylinder seat; 122-Locking cylinder II; 123-Clamping seat; 124-Locking cylinder III; 125-Bushing; 126-End cap; 127-Connecting seat; 128-Limiting plate; 129-Cylinder base plate; 130-Cylinder; 131-Anti-rotation pin; 132-Clamping device; 133-Workpiece flat Platform; 134-Claw; 135-Waist hoop platform; 136-Positioning pin; 137-Left and right workpiece support platform; 138-Anchor bolt; 139-Ground anchor; 140-Adjusting shim; 141-Recovery mechanism; 142-Scrap metal recovery mechanism; 143-Cutting fluid recovery mechanism; 144-Scrap conveyor; 145-Hoist; 146-Scrap collection trolley; 147-Filter; 148-High pressure pump. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0036] like Figure 1The diagram shows the overall structure of the special machine tool for machining the inner cavity of the metal reflector layer of a nuclear power plant according to the present invention. It includes a main unit 1, a rotary table 80, an outer gantry 96, a clamping device 132, and a recovery mechanism 141. The main unit 1 includes an inner column 2, a crossbeam 23, and a tool holder 49. A universal milling head 55 is mounted at the front end of the tool holder 49, and a milling cutter disc 73 is configured. The entire main unit 1 is connected to the rotary table 80. The rotary table 80 uses two sets of drive mechanisms 81 and a circular grating 82 to achieve precise positioning at 0°, 90°, 180°, and 270°. The upper part is also equipped with a clamping cylinder 84 to lock the worktable 83; the outer gantry 96 is symmetrically arranged on both sides of the main unit 1, and a moving crossbeam 100 is provided at the top. The outer gantry 96 is equipped with a locking mechanism 103 that can lock the outer gantry 96 and the moving crossbeam 100, and a clamping mechanism 119 that locks the moving crossbeam 100 and the inner column 2; the clamping device 132 includes a workpiece platform 133, a waist hoop platform 135 and a chuck 134, and is also equipped with a positioning pin 136 to facilitate the positioning and clamping of the workpiece; and is equipped with a chip and cutting fluid recovery mechanism 141. In the above embodiment, the host machine 1 realizes the movement of the machine tool in the x, y, and z directions. Considering the height of the machine tool, an outer gantry 96 is added to improve the rigidity of the inner column 2. Before processing, the locking mechanism 103 and the clamping mechanism 119 are not working. The moving crossbeam 100 opens from above the host machine 1, the workpiece is hoisted in from above, the positioning pin 136 positions the workpiece, the clamping device 132 clamps it, the moving crossbeam 100 opens back, the locking mechanism 103 works, the moving crossbeam 100 is locked with the outer gantry 96, the clamping mechanism 119 works, and after the moving crossbeam 100 is locked with the inner column 2, the machine tool processes one-quarter of the workpiece. After processing is completed, the No. III locking cylinder 124 and cylinder 130 stop working, the No. II locking cylinder 122 remains unchanged, the rotary table 80 rotates 90°, the No. III locking cylinder 124 and cylinder 133 work, and the machine tool processes the other one-quarter of the workpiece. This process is repeated four times until the workpiece is processed.

[0037] like Figure 1-4As shown in a further preferred embodiment, the inner columns 2 are arranged vertically, with a left column 3 and a right column 4. The tops of the left and right columns are connected to the gantry top 5, and the bottoms are connected to the lower connecting beam 6. The inner columns 2 are placed on the workbench 83, and lifting piles 7 are set on both sides of the tops of the left and right columns. Four sets of No. 1 linear guide rails 8 are installed on the front plane and the inner opposite side of the inner columns 2. At the same time, one balance cylinder 9 is installed on the left and one on the right on the front plane of the inner columns 2. The balance cylinders 9 are connected to the crossbeam 23 through the bracket 10. A lifting mechanism 11 is installed on the inner columns 2. The lifting mechanism 11 is divided into two groups, left and right, and is installed in the U-shaped grooves on the left column 3 and the right column 4, respectively. The lifting mechanism 11 includes The system consists of a ball screw assembly 12, flange 13, locking nut 14, coupling 15, reducer 16, servo motor 17, bearing 18, bearing seat 19, and adjusting shim 20. The ball screw assembly 16 is connected to the inner column 2 via bearing 18 and bearing seat 19. The servo motor 17 is connected to the reducer 16. The reducer 16 is installed in the pre-drilled hole of the gantry top 5 via adjusting shim 20. The output end of the reducer 16 is connected to the ball screw assembly 12 via coupling 15. The crossbeam 23 is connected to nut 22 in the ball screw assembly 12 via nut seat 25, enabling the crossbeam 23 to move up and down. In the above embodiment, the crossbeam 23 moves up and down in the inner column 2 as the y-axis, and the stroke of the y-axis must meet the requirements of the workpiece machining height; the y-axis is equipped with hydraulic load reduction, and the balance cylinder 9 is installed in the left column 3 and the right column 4 to balance the external load, such as the action of gravity or other forces, so that the load is kept in a balanced state and the machine tool runs smoothly.

[0038] like Figure 1 and Figure 5-7As shown, a No. I rail slider 24 is mounted on the crossbeam 23, which can cooperate with the No. I rail guide rail 8 mounted on the inner column 2. No. I nut seats 25, which cooperate with No. I nuts 22, are mounted on both sides of the crossbeam 23. No. I inserts 26 are mounted on both sides of the crossbeam 23. The No. I inserts 26 are divided into eight groups: up, down, left, right, front, and back. The No. I inserts 26 are assembled with the crossbeam 23. A No. I adjusting shim 27 is placed between the No. I inserts 26 and the crossbeam 23. A scraper 28 is mounted on the No. I insert 26. A No. I flexible strip 29 is placed between the inner column 2 and the contact surface of the No. I insert 26. The No. I flexible strip 29 and... The inner side of the inner column 2 has a smooth surface in contact, forming a sliding pair; a walkway 30 is installed at the front end of the crossbeam 23, and a drag chain bracket 31 is installed at the rear end; a transverse movement mechanism 32 is installed in the U-shaped groove of the crossbeam. The transverse movement mechanism 32 is similar to the lifting mechanism 11. The No. II ball screw pair 33 of the transverse movement mechanism 32 is arranged in parallel with the No. II servo motor 34. One side of the No. II ball screw pair 33 is connected to the No. I synchronous pulley 35. The No. II servo motor 34 is connected to the No. II reducer 36. The No. II reducer 36 is connected to the crossbeam 23 through a fixed support 37. The output end of the No. II reducer 36 is connected to the No. I pair. A synchronous pulley 38 is connected. A cylindrical pin 39 is provided on the support plate 40. A cylindrical pin hole that mates with the cylindrical pin 39 is provided on the slide block 50. The support plate 40 and the slide block 50 are positioned by the cylindrical pin 39. The support plate 40 is connected to the slide block 50. The support plate 40 and the crossbeam 23 form a sliding pair through the crossbeam pressure plate 41. The crossbeam pressure plate 41 is divided into two groups, left and right, and is connected to the support plate 40. A No. II insert 42 is arranged between the support plate 40 and the crossbeam 23. The No. II insert 42 is divided into two groups, front and back. The No. II insert 42 is connected to the support plate 40. There is a No. II adjustment between the No. II insert 42 and the support plate 40. A pad 43 is used; a No. III insert 44 is arranged between the crossbeam 23 and the crossbeam pressure plate 41. The No. III insert 44 is divided into four groups: front, back, left, and right. The No. III insert 44 is connected to the crossbeam pressure plate 41. There is a No. III adjusting pad 45 between the No. III insert 44 and the crossbeam pressure plate 41. There is a No. II soft strip 46 between the crossbeam 23 and the No. II insert 42 and the No. III insert 44, and between the crossbeam 23 and the contact surface of the support plate 40. The bottom surface of the support plate 40 is connected to the mounting plate 47. The mounting plate 47 is connected to the No. II nut 48 in the No. II ball screw pair 33, so as to realize the left and right movement of the tool holder 49. In the above embodiment, the left and right movement of the tool holder 49 is used as the x-axis. The stroke of the x-axis must meet the requirements of the machining length in the horizontal direction of the workpiece.

[0039] like Figure 1 and Figure 8-9As shown, the tool holder 49 includes a slide 50, a feed box 51, a ram 52, a spindle 53, a spindle motor 54, and a universal milling head 55. The tool holder 49 is fixedly connected to the support plate 40 via the slide 50. The feed box 51 includes a No. III ball screw assembly 56, a No. II bearing 57, a flange 58, a pad 59, a protective cover 60, a No. III nut 61, a mounting bracket 62, a No. III reducer 63, and a No. III servo motor 64. The No. III ball screw assembly 56 is fitted with the No. II bearing 57 and the flange 58 at the front and rear. The flange 58 is connected to the pad 59. The No. III ball screw assembly 56 is placed on the slide 50 via the pad 59. Inside the 0, the front end of the No. III ball screw pair 56 is equipped with a protective cover 60, and the rear end is connected to the No. III reducer 63 and the No. III servo motor 64. The No. III reducer 63 is connected to the mounting bracket 62, and the mounting bracket 62 is connected to the pad 59. The ram 52 is connected to the slide seat 50 through the ram pressure plate 65 to form a sliding pair. The ram pressure plate 65 is connected to the slide seat 50. The No. IV insert 66 is arranged between the sliding seat 50 and the side contact surface of the ram 52. The No. IV insert 66 is divided into two groups, front and rear. The No. IV insert 66 is connected to the slide seat 50. There is a No. IV adjusting shim 67 between the No. IV insert 66 and the slide seat 50. The ram 52 and the ram pressure plate 65 are in contact. V-shaped inserts 68 are arranged between the mating surfaces. These inserts are divided into four groups: front, back, left, and right. Each V-shaped insert 68 is connected to the slide plate 65. A V-shaped adjusting pad 69 is located between the V-shaped inserts 68 and the slide plate 65. A III-shaped soft band 70 is located between the sliding block 50 and the slide block 52, and between the slide block 52 and the IV-shaped inserts 66 and V-shaped inserts 68. The bottom of the slide block 52 has a positioning hole that mates with the positioning shaft 71. A II-shaped nut seat 72 has a positioning groove that mates with the positioning shaft 71. The positioning shaft 71 positions the II-shaped nut seat 72 and the slide block 52. The II-shaped nut seat 72 is connected to the slide block 52. The II-shaped nut seat 72 and the III-shaped nut seat 70 are connected... The ball screw assembly 56 is connected to nut 61 of type III, enabling the slide ram 52 to move back and forth. The main shaft 53 is housed in the inner cavity of the slide ram 52. The front end of the main shaft 53 is connected to the universal milling head 55 via a custom interface. The universal milling head 55 is equipped with a milling cutter disc 73. A cutter cylinder 74 is installed at the end of the main shaft 53. A synchronous pulley 75 of type II is installed at the rear end of the main shaft 53. The output end of the gearbox 76 is connected to synchronous pulley 77 of type II. The gearbox 76 and the main shaft motor 54 are installed above the slide ram 52. A support 78 is installed at the output end of the gearbox 76 and is connected to the slide ram 52. A protective cover 79 for synchronous pulley type II is installed on the support 78.In the above embodiment, the slide 52 moves back and forth as the z-axis, and the travel of the z-axis must meet the requirements of the machining width in the horizontal direction of the workpiece; the gearbox 76 has two speed ratios, high and low; the front end of the spindle 53 is equipped with a universal milling head 55, which can turn in different directions to mill different surfaces, thereby expanding the machining range. The universal milling head 55 can be adapted to various specifications of milling cutter heads 73. When machining large-sized workpieces, selecting a milling cutter head 73 with a larger diameter and more cutting teeth can greatly improve the milling efficiency.

[0040] like Figure 1 and Figure 10-12 As shown, the rotary worktable 80 has two sets of power drive mechanisms 81 and a circular grating 82 for precise positioning, as well as a clamping cylinder 84 for locking the worktable 83. The circular grating 82 is connected to a pad 85, the pad 85 is connected to an upper pressure plate 86, and the upper pressure plate 86 is connected to the main shaft 87 of the worktable. The clamping cylinder 84 includes an oil chamber 88, a piston 89, upper and lower cylinder covers 90, a sealing ring 91, a piston rod 92, a disc spring 93, and a pressure head 94. The upper end of the piston rod 92 is connected to the pressure head 94, and the lower end is connected to the piston 89. One end of the piston 89 is fitted into the oil chamber 88. The disc spring 93 and the sealing ring 91 are placed in place, and the upper and lower cylinder covers 90 are installed. The clamping cylinder 84 is installed on the base 95 in the rotary worktable 80, and the pressure head 94 is installed in the annular T-slot below the worktable 83. In the above embodiment, when processing the workpiece, the clamping cylinder 84 operates, and the piston rod 92 drives the pressure head 94 to move down, contacting the annular T-slot below the worktable 83 and generating a certain pressure to lock the worktable 83. When the worktable 83 is about to move to the next station, the clamping cylinder 84 stops working, and under the action of the disc spring 93, the pressure head 94 returns to the non-working position. Under the action of the circular grating 82, the worktable 83 achieves precise positioning at four stations: 0°, 90°, 180°, and 270°.

[0041] like Figure 1 and Figure 13-15As shown, the outer gantry 96 is symmetrically arranged on both sides of the main unit 1, consisting of a left outer column 97 and a right outer column 98, which are respectively connected to the left and right outer gantry column support platforms 99; a movable crossbeam 100 is provided at the top of the outer gantry 96, and a support pad 101 is installed between the movable crossbeam 100 and the outer gantry 96; and two sets of identical transmission mechanisms 102 and locking mechanisms 103 are arranged symmetrically on the left and right sides. The transmission mechanism 102 includes a linear guide 104, a No. IV ball screw pair 105, a No. III synchronous pulley 106, a No. III secondary synchronous pulley 107, a No. IV reducer 108, a synchronous pulley tensioning mechanism 109, and a transmission shaft 110. Among them, the No. II linear guide 111 and the No. IV ball screw pair 105 of the linear guide 104 are connected to the main unit 104. 05 is connected to the outer gantry 96, II linear guide slider 112 is connected to the moving crossbeam 100, IV nut 113 in IV ball screw pair 105 is connected to III synchronous pulley 107, and the corresponding III synchronous pulley 106 is connected to the output end of IV reducer 108. IV reducer 108 is connected to the moving crossbeam 100, and synchronous pulley tensioning mechanism 109 is installed on the moving crossbeam 100. The drive shaft 110 is connected to the input end of IV reducer 108, and the other end of the drive shaft 110 is connected to the output end of distribution gearbox 114. Distribution gearbox 114 is installed in the middle of the moving crossbeam 100, and the input end of distribution gearbox 114 is connected to IV servo motor 115. The locking mechanism... 103 includes a No. I locking cylinder 116, a cylinder support 117, and a locking pad 118. The No. I locking cylinder 116 is mounted on the cylinder support 117, which is connected to the outer gantry 96. The locking pad 118 is connected to the moving crossbeam 100. A clamping mechanism 119 is also provided on the moving crossbeam 100 to lock it to the inner column 2. The clamping mechanism 119 includes a connecting plate 120, a cylinder seat 121, a No. II locking cylinder 122, a clamping seat 123, a No. III locking cylinder 124, a bushing 125, an end cap 126, a connecting seat 127, a limiting plate 128, a cylinder base plate 129, a cylinder 130, and an anti-rotation pin 131. The connecting plate 120 is connected to the gantry top 5. A cylinder seat 121 is installed on the connecting plate 120, and a locking cylinder 122 (II) is installed on the cylinder seat 121. A locking cylinder 124 (III) is installed on the clamping seat 123. The cylindrical end of the connecting seat 127 is assembled with the bushing 125. The bushing 125 and the connecting seat 127 are assembled in the clamping seat 123. A limiting plate 128 is installed on the upper end of the clamping seat 123, and an end cover 126 is installed on its lower end. The end cover 126 is connected to the connecting seat 127 installed in the inner cavity of the clamping seat 123. The connecting seat 127 is connected to the moving crossbeam 100. A cylinder base plate 129 is installed on the connecting seat 127, and a cylinder 130 is installed on the cylinder base plate 129. An anti-rotation pin 131 is installed on the cylinder 130. A pin hole that mates with the anti-rotation pin 131 is provided on the clamping seat 123.A sliding groove exists between the connecting plate 120 and the cylinder seat 121, forming a sliding pair with the clamping seat 123. In the above embodiment, the moving crossbeam 100 is connected to the clamping mechanism 119. When clamping a workpiece, the locking mechanism 103 is not working, that is, the No. I locking cylinder 116 is not working, and the No. II locking cylinder 122 is also not working. The No. III locking cylinder 124 and the cylinder 130 are working. Under the action of the transmission mechanism 102, the moving crossbeam 100, along with the clamping seat 123, moves away from the top of the main machine 1. After the workpiece is clamped, the moving crossbeam 100 and the clamping seat 123 move back to the top of the main machine 1, and then the No. I locking cylinder 116 works, moving... The moving crossbeam 100 is locked to the outer gantry 96, and locking cylinder II 122 operates, locking the moving crossbeam 100 to the inner column 2. When processing enters the next stage, the workpiece needs to rotate 90°. At this time, locking cylinders III 124 and 130 stop operating, and connecting seat 127 and clamping seat 123 can rotate relative to each other. That is, the degree of freedom of rotation of the inner column 2 around the y-axis is no longer restricted. After rotating to the correct position, locking cylinders III 124 and 130 operate, locking the moving crossbeam 100 to the inner column 2, and continuing the next stage of processing.

[0042] like Figure 1 and 16 As shown, the clamping device 132 includes a workpiece platform 133, jaws 134, and a waist-hoop platform 135. The workpiece platform 133 is provided with positioning pins 136 to facilitate workpiece positioning and clamping, and T-slots for accommodating the jaws 134 and the waist-hoop platform 135. The positioning pins 136 are connected to the workpiece platform 133. The workpiece platform 133 includes left and right workpiece support platforms 137 and left and right outer gantry column support platforms 99. The left and right outer gantry column support platforms 99 are connected to the left and right workpiece support platforms 137 and are connected to the foundation by anchor bolts 138. There are ground anchors 139 and adjusting shims 140 between the workpiece platform 133 and the foundation for leveling the workpiece platform 133. The top of the waist-hoop platform 135 is provided with a T-slot for installing the jaws 134. In the above embodiment, the workpiece is placed on the workpiece platform 133, the positioning pins 136 position the workpiece, and the workpiece is clamped by the jaws 134.

[0043] like Figure 1 and 17As shown, the recycling mechanism 141 is located at the bottom of the machine tool and includes a chip recycling mechanism 142 and a cutting fluid recycling mechanism 143. The chip recycling mechanism 142 includes a chip conveyor 144 and a hoist 145. The chip conveyor 144 is arranged in a ring around the rotary table 80. One end of the hoist 145 is located below the chip conveyor 144, and the other end is located above the ground. A chip collection trolley 146 is located below the hoist 145 at the end above the ground. The cutting fluid recycling mechanism 143 includes a filter 147 and a high-pressure pump 148. In the above embodiment, the chips are collected by the chip conveyor 144 and converged into the chip collection trolley 146 by the hoist 145. After the cutting fluid falls into the pit, it is filtered and pumped back to the machining area by the high-pressure pump 148 for cooling the cutting tools and flushing away chips.

[0044] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims. The use of these terms herein is merely for the convenience of describing and explaining the essence of the invention, and interpreting them as any additional limitation would be contrary to the spirit of the invention.

Claims

1. A machine tool for machining the inner cavity of a metal reflector of a nuclear reactor, comprising a main machine, a rotary table, an outer gantry, a clamping device and a recovery mechanism, characterized in that: The main unit includes an inner column, a crossbeam, and a tool post. A universal milling head with a milling cutter disc is mounted at the front of the tool post. The traversing mechanism and the tool post are mounted on the crossbeam. The entire main unit is connected to a rotary table. The rotary table employs two sets of drive mechanisms. A circular grating capable of precise positioning at 0°, 90°, 180°, and 270° is installed on the rotary table. An annular T-slot for locking the worktable is also provided on the rotary table. The outer gantry is symmetrically arranged on both sides of the main unit, with a moving crossbeam and transmission mechanism at its top. The outer gantry is equipped with a locking mechanism to lock the outer gantry to the moving crossbeam, and a clamping mechanism to lock the moving crossbeam to the inner column. The clamping device includes a workpiece platform, a waist-hoop platform, chucks, and positioning pins. A chip recovery mechanism and a cutting fluid recovery mechanism are installed at the bottom of the machine tool. The inner columns are arranged vertically, consisting of left and right columns, with a crossbeam between them. The crossbeam has a compact U-shaped groove. The tops of the left and right columns are connected to the top of the gantry, and the bottoms are connected to the lower connecting beam. The inner columns are placed on a workbench, and lifting piles are installed on both sides of the top of the left and right columns. Four sets of No. 1 linear guide rails are installed on the front and inner opposite sides of the inner columns. A balance cylinder is installed on each side of the front plane of the inner columns, and these balance cylinders are connected to the crossbeam via brackets. A lifting mechanism is installed on the inner columns, consisting of two sets, left and right. The lifting mechanism, consisting of a ball screw assembly (No. I), a flange, a locking nut, a coupling, a reducer (No. I), a servo motor (No. I), a bearing (No. I), a bearing housing, and an adjusting shim, is installed in U-shaped grooves on the left and right columns respectively. The ball screw assembly (No. I) is connected to the inner column via the bearing (No. I) and the bearing housing. The servo motor (No. I) is connected to the reducer (No. I). The reducer (No. I) is installed in a pre-drilled hole on the top of the gantry via the adjusting shim. The output end of the reducer (No. I) is connected to the ball screw assembly (No. I) via a coupling. The crossbeam is connected to the nut (No. I) in the ball screw assembly (No. I) via a nut housing. The clamping mechanism refers to a clamping mechanism installed on the moving crossbeam that can lock the moving crossbeam to the inner column. The clamping mechanism includes a connecting plate, a cylinder seat, a No. II locking cylinder, a clamping seat, a No. III locking cylinder, a bushing, an end cap, a connecting seat, a limiting plate, a cylinder base plate, a cylinder, and an anti-rotation pin. The connecting plate is connected to the top of the gantry. The cylinder seat is installed on the connecting plate, and the No. II locking cylinder is installed on the cylinder seat; the No. III locking cylinder is installed on the clamping seat. The cylindrical end of the connecting seat is fitted together with the bushing. The bushing and the connecting seat are assembled in the clamping seat. A limiting plate is installed on the upper end of the clamping seat, and an end cap is installed on its lower end. The end cap is connected to the connecting seat installed in the inner cavity of the clamping seat. The connecting seat is connected to the moving crossbeam. A cylinder base plate is installed on the connecting seat, and a cylinder is installed on the cylinder base plate. An anti-rotation pin is installed on the cylinder. The clamping seat is provided with a pin hole that mates with the anti-rotation pin. There is a sliding groove between the connecting plate and the cylinder seat, which together with the clamping seat form a moving pair.

2. The machine tool according to claim 1, wherein: The crossbeam is equipped with a No. I linear guide slider that mates with the No. I linear guide rail mounted on the inner column. No. I nut seats that mate with No. I nuts are mounted on both sides of the crossbeam. Eight sets of No. I inserts are mounted on both sides of the crossbeam. The No. I inserts are assembled with the crossbeam, and there is a No. I adjusting shim between the No. I insert and the crossbeam. A scraper is mounted on the No. I insert. A No. I soft belt is located between the inner column and the contact surface of the No. I insert, and the No. I soft belt contacts the smooth inner surface of the inner column, forming a sliding pair. A walkway is installed at the front end of the crossbeam, and a drag chain bracket is installed at the rear end. A transverse movement mechanism is installed in the U-shaped groove of the crossbeam. The No. II ball screw pair of the transverse movement mechanism is arranged parallel to the No. II servo motor. One side of the No. II ball screw pair is connected to the No. I synchronous pulley. The No. II servo motor is connected to the No. II reducer. The No. II reducer is connected to the crossbeam through a fixed support. The output end of the device is connected to the No. I synchronous pulley. A cylindrical pin is provided on the support plate, and a cylindrical pin hole is provided on the slide to mate with the cylindrical pin. The support plate and the slide are positioned by the cylindrical pin. The support plate is connected to the slide. The support plate forms a sliding pair with the crossbeam through the crossbeam pressure plate. The crossbeam pressure plate is divided into left and right groups and is connected to the support plate. Two sets of No. II inserts are arranged between the support plate and the crossbeam. The No. II inserts are connected to the support plate. There is a No. II adjusting shim between the No. II inserts and the support plate. Four sets of No. III inserts are arranged between the crossbeam and the crossbeam pressure plate. The No. III inserts are connected to the crossbeam pressure plate. There is a No. III adjusting shim between the No. III inserts and the crossbeam pressure plate. There is a No. II soft belt between the crossbeam and the No. II inserts and No. III inserts, as well as between the crossbeam and the support plate. The bottom surface of the support plate is connected to the mounting plate. The mounting plate is connected to the No. II nut in the No. II ball screw pair.

3. The machine tool according to claim 1, wherein: the machine tool is a machine tool for processing a metal reflector inner cavity of a nuclear reactor, and the first and second processing heads are arranged to be capable of processing the metal reflector inner cavity of the nuclear reactor. The tool holder includes a slide, feed box, ram, spindle, spindle motor, and universal milling head. The tool holder is fixedly connected to the support plate via the slide. The feed box includes a No. III ball screw assembly, a No. II bearing, a flange, a pad, a cover, a No. III nut, a mounting bracket, a No. III reducer, and a No. III servo motor. The No. III ball screw assembly is fitted with the No. II bearing and the flange at the front and rear, respectively. The flange is connected to the pad, and the No. III ball screw assembly is placed in the slide via the pad. The front end of the No. III ball screw assembly is equipped with a cover, and the rear end is connected to the No. III reducer and the No. III servo motor. The No. III reducer is connected to the mounting bracket, and the mounting bracket is connected to the pad. The ram is connected to the slide via a ram pressure plate to form a sliding pair. The ram pressure plate is connected to the slide. Two sets of No. IV inserts are arranged between the contact surfaces of the slide and the ram on one side. The No. IV inserts are connected to the slide, and there is a No. IV adjusting shim between the No. IV inserts and the slide. Four sets of V-shaped inserts are arranged between the mating surfaces of the pressure plates. The V-shaped inserts are connected to the slide plate, and there is a V-shaped adjusting shim between the V-shaped inserts and the slide plate. There is a III-shaped soft belt between the mating surfaces of the slide block and the slide block, the slide block and the IV-shaped inserts and the V-shaped inserts. The bottom of the slide block has a positioning hole that mates with the positioning shaft, and the II-shaped nut seat has a positioning groove that mates with the positioning shaft. The II-shaped nut seat and the slide block are positioned by the positioning shaft. The II-shaped nut seat is connected to the slide block, and the II-shaped nut seat is connected to the III-shaped nut in the III-shaped ball screw pair. The main shaft is placed in the inner cavity of the slide block. The front end of the main shaft is connected to the universal milling head, which is equipped with a milling cutter disc. The cutter cylinder is installed at the end of the main shaft. The rear end of the main shaft is equipped with the II-shaped synchronous pulley, and the output end of the gearbox is connected to the II-shaped synchronous pulley. The gearbox and the main shaft motor are installed above the slide block. The output end of the gearbox is equipped with a support, which is connected to the slide block. A protective cover for the II-shaped synchronous pulley is installed on the support.

4. The machine tool according to claim 1, wherein: The rotary table has two sets of drive mechanisms and a circular grating for precise positioning, as well as a clamping cylinder for locking the table. The circular grating is connected to a pad, the pad is connected to an upper pressure plate, and the upper pressure plate is connected to the main shaft of the table. The clamping cylinder includes an oil chamber, a piston, upper and lower cylinder covers, a sealing ring, a piston rod, a disc spring, and a pressure head. The upper end of the piston rod is connected to the pressure head, and the lower end is connected to the piston. One end of the piston is installed in the oil chamber. The clamping cylinder is installed on the base of the rotary table, and the pressure head is placed in an annular T-slot below the table.

5. A special machine tool for machining the inner cavity of a nuclear power plant metal reflector layer according to claim 1, characterized in that: The outer gantry is symmetrically arranged on both sides of the main unit, consisting of a left outer column and a right outer column, which are respectively connected to the support platforms of the left and right outer gantry columns; a movable crossbeam is provided at the top of the outer gantry, and a support pad is installed between the movable crossbeam and the outer gantry; and two sets of transmission mechanisms and locking mechanisms with the same structure are arranged symmetrically on the left and right sides.

6. A special machine tool for machining the inner cavity of a nuclear power plant metal reflector layer according to claim 1, characterized in that: The transmission mechanism includes a linear guide rail, a No. IV ball screw pair, a No. III synchronous pulley, a No. III secondary synchronous pulley, a No. IV reducer, a synchronous pulley tensioning mechanism, and a transmission shaft. The No. II linear guide rail and the No. IV ball screw pair are connected to the outer gantry, and the No. II linear guide rail slider is connected to the moving crossbeam. The No. IV nut in the No. IV ball screw pair is connected to the No. III secondary synchronous pulley, and the corresponding No. III synchronous pulley is connected to the output end of the No. IV reducer. The No. IV reducer is connected to the moving crossbeam. The synchronous pulley tensioning mechanism is mounted on the moving crossbeam. The transmission shaft is connected to the input end of the No. IV reducer, and the other end of the transmission shaft is connected to the output end of the distribution gearbox. The distribution gearbox is mounted in the middle of the moving crossbeam, and its input end is connected to the No. IV servo motor. The locking mechanism includes a No. I locking cylinder, a cylinder support, and a locking pad. The No. I locking cylinder is mounted on the cylinder support, which is connected to the outer gantry. The locking pad is connected to the moving crossbeam.

7. A special machine tool for machining the inner cavity of a nuclear power plant metal reflector layer according to claim 1, characterized in that: The clamping device includes a workpiece platform, jaws, and a waist hoop platform. The workpiece platform is equipped with positioning pins that facilitate workpiece positioning and clamping, as well as T-slots for accommodating the jaws and waist hoop platform. The positioning pins are connected to the workpiece platform. The workpiece platform includes left and right workpiece support platforms and left and right outer gantry column support platforms. The left and right outer gantry column support platforms are connected to the left and right workpiece support platforms and are connected to the foundation by anchor bolts. There are ground anchors and adjusting shims between the workpiece platform and the foundation for leveling the workpiece platform. The top of the waist hoop platform is equipped with a T-slot for installing jaws.

8. A special machine tool for machining the inner cavity of a nuclear power plant metal reflector layer according to claim 1, characterized in that: The recycling mechanism is located at the bottom of the machine tool and includes a chip recycling mechanism and a cutting fluid recycling mechanism. The chip recycling mechanism includes a chip conveyor and a hoist. The chip conveyor is arranged in a ring around the rotary table. One end of the hoist is located below the chip conveyor, and the other end is located above the ground. A chip collection trolley is located below the hoist at the end above the ground. The cutting fluid recycling mechanism includes a filter and a high-pressure pump.

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