A high-precision welding CNC machine tool

Abstract

The present invention relates to the technical field of shell welding, and in particular to a high-precision welding CNC machine tool, comprising a main body plate, wherein the upper end of the main body plate is provided with a lifting and sealing mechanism for sealing the internal welding point of a tank body, the lifting and sealing mechanism comprises a sixth electric telescopic rod fixedly penetrating the upper end of the main body plate, the telescopic end of the sixth electric telescopic rod is fixedly connected to a fixing rod, the upper end of the main body plate is provided with a rotating welding mechanism for vertically welding the outer surface of the tank body, and the lower end of the main body plate is provided with a movable clamping mechanism for moving and fixing the tank body; the second motor drives the second fixed body of the fourth fixed body to rotate to a position on the same vertical plane as the fifth fixed body, and then the fourth motor drives the fifth electric telescopic rod to rotate to a position colinear with the fifth fixed body, so that the sealed welder welds the welding point vertically.

Description

Technical Field

[0001] The present invention relates to the technical field of shell welding, in particular to a high-precision welding numerical control machine tool. Background Art

[0002] Small metal storage tanks have the characteristics of high strength, good sealing, and the ability to withstand a certain pressure. They play an important storage function in chemical production, laboratory research and energy supply. Small metal storage tanks are generally spherical structures. During production, multiple components are generally welded into a spherical structure by welding. An empty groove is opened at the upper end of the spherical shell for connecting the inside of the shell with the outside world. Support columns are symmetrically arranged on the side of the spherical shell. Some volatile and corrosive liquids are generally stored inside the spherical shell. The material of the spherical shell is generally aluminum alloy or other non-corrosive materials.

[0003] Since small metal storage tanks are welded together by several layers of components, there are many welds on the surface of the tank body. The welds may crack under long-term pressure and contact with corrosive liquids. In order to improve the utilization rate of the tank body, the tank body is re-welded under the detection of an ultrasonic detector after long-term use if the rigidity is reduced or slag inclusions occur, thereby increasing the service life of the tank body. In the prior art, when welding the tank body, the welds on the outside of the tank body are welded by a welding gun, and inert gas is introduced into the welds during welding to prevent the metal tank body from reacting with the air at high temperature. However, due to the thin thickness of the tank body, the temperature of the inner wall of the tank body rises during welding, resulting in the position inside the weld being easily oxidized by the air during welding, reducing the overall quality of the tank body after welding. When welding the tank body with the current device, it cannot ensure that the welding gun is completely perpendicular to the weld, which reduces the uniform heating of the welding area during welding and is prone to slag inclusions. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a high-precision welding CNC machine tool.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a high-precision welding CNC machine tool, comprising a main body plate, the upper end of the main body plate is provided with a lifting and sealing mechanism for sealing the internal welding of the tank body, the lifting and sealing mechanism comprises a sixth electric telescopic rod fixedly arranged through the upper end of the main body plate, the telescopic end of the sixth electric telescopic rod is fixedly connected to a fixing rod, the upper end of the fixing rod is fixedly connected to a sixth motor, the transmission shaft end of the sixth motor is fixedly connected to a fixing plate, fourth slots are symmetrically provided on both sides of the fixing plate, two rotating blocks are rotatably arranged in the two fourth slots, and the sides of the two rotating blocks are respectively fixedly connected to the seventh electric telescopic rod, the telescopic end of one of the seventh electric telescopic rods is fixedly connected to the fifth fixed body, and the telescopic end of the other seventh electric telescopic rod is fixedly connected to an ultrasonic detection head, the upper end of the main body plate is provided with a rotating welding mechanism for vertically welding the outer surface of the tank body, and the lower end of the main body plate is provided with a mobile clamping mechanism for moving and fixing the tank body.

[0006] Preferably, two fifth motors are fixedly connected to the side of the fixed plate, and the transmission shaft ends of the two fifth motors are fixedly connected to the rotating blocks respectively. A third empty slot is provided on the side of the fifth fixed body, and an inert gas tank is fixedly connected to the side of the fifth fixed body. A gas pipe is provided through the side of the fifth fixed body, and the other end of the gas pipe is communicated with the inert gas tank.

[0007] Preferably, a second limiting groove is provided on the side of the fifth fixed body, and a number of circumferentially arranged pressure sensors are fixedly connected in the second limiting groove, and the ends of several of the pressure sensors are respectively fixedly connected with springs, and the other ends of several of the springs are fixedly connected with flexible rings that slide with the second limiting groove, and a number of air outlet holes are provided on the side of the flexible ring.

[0008] Preferably, the rotary welding mechanism includes a rotary groove provided on the upper end of the main body plate, a cavity communicating with the rotary groove provided on the upper end of the main body plate, a fixed ring rotatably connected to the main body plate in the cavity, the upper end of the fixed ring is fixedly connected to two symmetrically arranged second fixed bodies, the upper ends of the two second fixed bodies are respectively provided with a first limiting groove, the side surfaces of the two second fixed bodies are fixedly connected to the first motor, the transmission shaft ends of the two first motors are respectively fixedly connected to threaded rods, the side surfaces of the two threaded rods are respectively connected to the limiting bodies through threaded cooperation, the side surfaces of the two limiting bodies are respectively slidably cooperated with the first limiting groove, and the upper ends of the two limiting bodies are respectively fixedly connected to the third electric telescopic rod.

[0009] Preferably, the telescopic end of one of the third electric telescopic rods is fixedly connected to a third fixed body, a first empty slot is opened at the upper end of the third fixed body, the third fixed body is rotatably connected to the fourth electric telescopic rod in the first empty slot, the side of the third fixed body is fixedly connected to a third motor, the transmission shaft end of the third motor is fixedly connected to the side of the fourth electric telescopic rod, and the telescopic end of the fourth electric telescopic rod is fixedly connected to a sealed welder.

[0010] Preferably, the telescopic end of another of the third electric telescopic rods is fixedly connected to a fourth fixed body, a second empty groove is opened on the side of the fourth fixed body, a fifth electric telescopic rod is rotatably connected in the second empty groove, a fourth motor is fixedly connected to the side of the fourth fixed body, a transmission shaft end of the fourth motor is fixedly connected to the side of the fifth electric telescopic rod, and the telescopic end of the fifth electric telescopic rod is fixedly connected to a sealed welder.

[0011] Preferably, a second motor is fixedly connected in the cavity, a gear is fixedly connected to the transmission shaft end of the second motor, and a gear ring meshing with the gear is fixedly connected to the side surface of the fixing ring.

[0012] Preferably, the mobile clamping mechanism includes two first electric telescopic rods symmetrically arranged at the lower end of the main body plate, the telescopic ends of the four first electric telescopic rods are respectively fixedly connected to the first fixed body, the lower ends of the four first fixed bodies are respectively rotatably connected to rollers, and the upper end of the main body plate is provided with four symmetrically arranged first placement grooves, the four first placement grooves are respectively fixedly connected to the second electric telescopic rods, and the telescopic ends of the four second electric telescopic rods are respectively fixedly connected to the limiting blocks.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The rotation of the fifth motor is controlled by several pressure sensors on the side of the fifth fixed body, ensuring that the values ​​of the several symmetrical pressure sensors are consistent, thereby ensuring that the fifth fixed body is perpendicular to the weld. The fifth motor drives the two seventh electric telescopic rods to rotate to a position aligned with the weld seam. The two seventh electric telescopic rods then extend, driving the flexible ring and ultrasonic detector on the side of the fifth fixed body to contact the inner wall of the tank. The inert gas tank and the sixth motor are then activated. The inert gas tank then fills the third slot with inert gas through the gas pipe. During rotation, the ultrasonic detector can detect problems such as pores in the weld seam that reduce the connection strength, and drives the fifth fixed body to a position with weaker connection strength. At the same time, the second motor rotates, driving the gears. The meshing of the gears drives the fixed ring to rotate, which in turn drives the two second fixed bodies to rotate. The second motor is connected to the sixth motor via electrical wires. When the ultrasonic detector detects the weld seam in the upper part, the second motor drives the second fixed body of the fourth fixed body to rotate to a position on the same vertical plane as the fifth fixed body. The fourth motor then drives the fifth electric telescopic rod to rotate to a position colinear with the fifth fixed body. As a result, the sealed welder welds the weld perpendicularly.

[0015] During welding, the inert gas tank can ensure that the third empty slot is filled with inert gas to prevent the inner side of the tank from reacting with the air at high temperature. At the same time, the gas is discharged through a number of air outlets, and the directions of the air outlets correspond to the tank body. The blown gas can blow away the impurities inside the tank body, preventing the impurities on the inner wall of the tank from sticking to the inner wall of the tank at high temperature, thereby improving the quality of the tank body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0017] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ;

[0018] Figure 3 The present invention is a sectional view of the whole Figure 1 ;

[0019] Figure 4 The present invention is a sectional view of the whole Figure 2 ;

[0020] Figure 5 For the present invention Figure 3 A magnified view of point A;

[0021] Figure 6 For the present invention Figure 3 Enlarged view of point B;

[0022] Figure 7 For the present invention Figure 3 Enlarged view of point C;

[0023] Figure 8 For the present invention Figure 3 Enlarged view of point D;

[0024] Figure 9 For the present invention Figure 4 Enlarged view of point E.

[0025] 1. Main plate; 2. Mobile clamping mechanism; 3. Rotating welding mechanism; 4. Lifting and sealing mechanism; 21. First electric telescopic rod; 22. First fixed body; 23. Roller; 24. First placement slot; 25. Second electric telescopic rod; 26. Stopper; 31. Rotating slot; 32. Fixed ring; 33. Second fixed body; 34. First motor; 35. First stopper slot; 36. Gear ring; 37. Threaded rod; 38. Cavity; 39. Second motor; 310. Gear; 311. Stopper; 312. Third electric telescopic rod; 313. Third fixed body; 314. First slot; 315. Fourth electric telescopic rod Retractable rod; 316, third motor; 317, sealed welder; 318, fourth fixed body; 319, second empty slot; 320, fourth motor; 321, fifth electric telescopic rod; 41, sixth electric telescopic rod; 42, seventh electric telescopic rod; 43, gas pipe; 44, inert gas tank; 45, fifth fixed body; 46, third empty slot; 47, second limit slot; 48, spring; 49, pressure sensor; 410, flexible ring; 411, air outlet; 412, rotating block; 413, fixed plate; 414, fourth empty slot; 415, fifth motor; 416, fixed rod; 418, sixth motor. DETAILED DESCRIPTION

[0026] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0027] See also Figure 1 - Figure 9 A high-precision welding CNC machine tool includes a main body plate 1, and the upper end of the main body plate 1 is provided with a lifting sealing mechanism 4 for sealing the welding position inside the tank body.

[0028] The lifting and sealing mechanism 4 includes a sixth electric telescopic rod 41 fixedly provided through the upper end of the main body plate 1, the telescopic end of the sixth electric telescopic rod 41 is fixedly connected to a fixed rod 416, a sixth motor 418 is fixedly connected to the upper end of the fixed rod 416, and the transmission shaft end of the sixth motor 418 is fixedly connected to a fixed plate 413. Fourth slots 414 are symmetrically provided on both sides of the fixed plate 413, and rotating blocks 412 are rotatably provided in two of the fourth slots 414. The sides of the two rotating blocks 412 are respectively fixedly connected to the seventh electric telescopic rod 42, the telescopic end of one of the seventh electric telescopic rods 42 is fixedly connected to the fifth fixed body 45, and the telescopic end of the other seventh electric telescopic rod 42 is fixedly connected to the ultrasonic detection head.

[0029] Two fifth motors 415 are fixedly connected to the side of the fixed plate 413, and the transmission shaft ends of the two fifth motors 415 are respectively fixedly connected to the rotating block 412. A third slot 46 is provided on the side of the fifth fixed body 45, and an inert gas tank 44 is fixedly connected to the side of the fifth fixed body 45. A gas pipe 43 is provided through the side of the fifth fixed body 45, and the other end of the gas pipe 43 is connected to the inert gas tank 44.

[0030] A second limiting groove 47 is provided on the side of the fifth fixed body 45, and a plurality of circumferentially arranged pressure sensors 49 are fixedly connected in the second limiting groove 47. The ends of the plurality of pressure sensors 49 are respectively fixedly connected with springs 48, and the other ends of the plurality of springs 48 are fixedly connected with flexible rings 410 that slide with the second limiting groove 47, and a plurality of air outlet holes 411 are provided on the side of the flexible ring 410.

[0031] Specifically, the fifth motor 415 is started, and the rotation of the fifth motor 415 is controlled by several pressure sensors 49 on the side of the fifth fixed body 45, so that the values ​​of several symmetrical pressure sensors 49 are consistent, thereby ensuring that the fifth fixed body 45 is perpendicular to the welding point, and the fifth motor 415 drives the two seventh electric telescopic rods 42 to rotate to a position aligned with the weld.

[0032] The upper end of the main body plate 1 is provided with a rotating welding mechanism 3 for vertically welding the outer surface of the tank body.

[0033] The rotary welding mechanism 3 includes a rotary groove 31 provided at the upper end of the main body plate 1, a cavity 38 communicating with the rotary groove 31 provided at the upper end of the main body plate 1, and a fixing ring 32 rotatably connected to the main body plate 1 in the cavity 38, and the upper end of the fixing ring 32 is fixedly connected to two symmetrically arranged second fixing bodies 33, and the upper ends of the two second fixing bodies 33 are respectively provided with a first limiting groove 35, and the side surfaces of the two second fixing bodies 33 are fixedly connected to the first motor 34, and the transmission shaft ends of the two first motors 34 are respectively fixedly connected to the threaded rods 37, and the side surfaces of the two threaded rods 37 are respectively connected to the limiting bodies 311 through threaded cooperation, and the side surfaces of the two limiting bodies 311 are respectively slidably cooperated with the first limiting groove 35, and the upper ends of the two limiting bodies 311 are respectively fixedly connected to the third electric telescopic rod 312.

[0034] The telescopic end of the third electric telescopic rod 312 is fixedly connected to a third fixed body 313. A first slot 314 is defined at the upper end of the third fixed body 313. The third fixed body 313 is rotatably connected to a fourth electric telescopic rod 315 within the first slot 314. A third motor 316 is fixedly connected to the side of the third fixed body 313. The drive shaft end of the third motor 316 is fixedly connected to the side of the fourth electric telescopic rod 315. A sealed welder 317 is fixedly connected to the telescopic end of the fourth electric telescopic rod 315.

[0035] The telescopic end of the other third electric telescopic rod 312 is fixedly connected to the fourth fixed body 318, and a second slot 319 is opened on the side of the fourth fixed body 318. The fifth electric telescopic rod 321 is rotatably connected in the second slot 319. The side of the fourth fixed body 318 is fixedly connected to the fourth motor 320, and the transmission shaft end of the fourth motor 320 is fixedly connected to the side of the fifth electric telescopic rod 321. The telescopic end of the fifth electric telescopic rod 321 is fixedly connected to the sealed welder 317.

[0036] A second motor 39 is fixedly connected in the cavity 38 . A gear 310 is fixedly connected to a transmission shaft end of the second motor 39 . A gear ring 36 meshing with the gear 310 is fixedly connected to a side surface of the fixing ring 32 .

[0037] Specifically, the second motor 39 drives the gear 310 to rotate, the gear 310 engages to drive the fixed ring 32 to rotate, the fixed ring 32 drives the two second fixed bodies 33 to rotate, and the second motor 39 is connected to the sixth motor 418 through wires. When the ultrasonic detector detects the weld in the upper part of the position, the second motor 39 drives the second fixed body 33 of the fourth fixed body 318 to rotate to a position on the same vertical plane as the fifth fixed body 45.

[0038] A movable clamping mechanism 2 for moving and fixing the tank body is provided at the lower end of the main body plate 1 .

[0039] The mobile clamping mechanism 2 includes two first electric telescopic rods 21 symmetrically arranged at the lower end of the main body plate 1, the telescopic ends of the four first electric telescopic rods 21 are respectively fixedly connected to the first fixed body 22, and the lower ends of the four first fixed bodies 22 are respectively rotatably connected to the rollers 23. The upper end of the main body plate 1 is provided with four symmetrically arranged first placement grooves 24, and the four first placement grooves 24 are respectively fixedly connected to the second electric telescopic rods 25, and the telescopic ends of the four second electric telescopic rods 25 are respectively fixedly connected to the limiting blocks 26.

[0040] Specifically, the main plate 1 moves to the bottom of the tank body through the four rollers 23. At this time, the sixth electric telescopic rod 41 is retracted and the two seventh electric telescopic rods 42 are in a vertical state. Then, the four second electric telescopic rods 25 are extended, and the four second electric telescopic rods 25 drive the limit blocks 26 to fix the lower end of the tank body.

[0041] When in use, the main body plate 1 is moved to the bottom of the tank body through the four rollers 23. At this time, the sixth electric telescopic rod 41 is retracted and the two seventh electric telescopic rods 42 are in a vertical state. Then, the four second electric telescopic rods 25 are extended, and the four second electric telescopic rods 25 drive the limit blocks 26 to fix the lower end of the tank body. Then, the sixth electric telescopic rod 41 is extended, and the sixth electric telescopic rod 41 drives the fixing plate 413 to move into the inside of the tank body. Then, the two seventh electric telescopic rods 42 are extended. At the same time, the fifth motor 415 is started, and the rotation of the fifth motor 415 is controlled by the several pressure sensors 49 on the side of the fifth fixed body 45, so that the values ​​of the several symmetrical pressure sensors 49 are consistent, thereby ensuring that the fifth fixed body 45 is perpendicular to the welding point. The fifth motor 415 drives the two seventh electric telescopic rods 42 to rotate to the position aligned with the weld seam respectively. Then, the two seventh electric telescopic rods 42 are extended, driving the flexible ring 410 and the ultrasonic detector on the side of the fifth fixed body 45 to contact the inner wall of the tank. Then, the fifth motor 415 is started. The inert gas tank 44 and the sixth motor 418 are driven. At this time, the inert gas tank 44 fills the third empty groove 46 with inert gas through the gas pipe 43. While rotating, the ultrasonic detector can detect problems such as pores in the weld that reduce the connection strength, and drive the fifth fixed body 45 to rotate to a position where the connection strength is weaker. At the same time, the second motor 39 rotates, and the second motor 39 drives the gear 310 to rotate. The gear 310 engages and drives the fixing ring 32 to rotate. The fixing ring 32 drives the two second fixed bodies 33 to rotate. The second motor 39 is connected to the sixth motor 418 through an electric wire. When the ultrasonic detector detects the weld in the upper part of the position, the second motor 39 drives the second fixed body 33 of the fourth fixed body 318 to rotate to a position on the same vertical plane as the fifth fixed body 45. Then, the fourth motor 320 drives the fifth electric telescopic rod 321 to rotate to a position colinear with the fifth fixed body 45. Therefore, the sealed welder 317 welds the weld vertically, thereby improving the quality of the weld after welding.

[0042] During welding, the inert gas tank 44 can ensure that the third empty groove 46 is filled with inert gas to prevent the inner side of the tank from reacting with the air at high temperature. At the same time, the gas is discharged through a plurality of gas outlet holes 411. The directions of the plurality of gas outlet holes 411 correspond to the tank body. The blown gas can blow away impurities on the inner wall of the tank body to prevent the impurities on the inner wall of the tank body from sticking to the inner wall of the tank body at high temperature, thereby improving the quality of the tank body.

[0043] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision welding CNC machine tool, comprising a main body plate (1), characterized in that: The upper end of the main body plate (1) is provided with a lifting sealing mechanism (4) for sealing the internal welding portion of the tank body. The lifting sealing mechanism (4) comprises a sixth electric telescopic rod (41) fixedly provided through the upper end of the main body plate (1). The telescopic end of the sixth electric telescopic rod (41) is fixedly connected to a fixing rod (416). A sixth motor (418) is fixedly connected to the upper end of the fixing rod (416). The transmission shaft end of the sixth motor (418) is fixedly connected to a fixing plate (413). Fourth slots (414) are symmetrically provided on both sides of the fixing plate (413). Rotating blocks (412) are rotatably provided in two of the fourth slots (414). The sides of the two rotating blocks (412) are respectively fixedly connected to the second slots (414). Seven electric telescopic rods (42), the telescopic end of one of the seventh electric telescopic rods (42) is fixedly connected to a fifth fixed body (45), the telescopic end of the other seventh electric telescopic rod (42) is fixedly connected to an ultrasonic detection head, the upper end of the main body plate (1) is provided with a rotating welding mechanism (3) for vertically welding the outer surface of the tank body, the lower end of the main body plate (1) is provided with a mobile clamping mechanism (2) for moving and fixing the tank body, the side of the fixed plate (413) is fixedly connected to two fifth motors (415), the transmission shaft ends of the two fifth motors (415) are respectively fixedly connected to the rotating block (412), the side of the fifth fixed body (45) is provided with a third empty slot (46), the fifth fixed body The side of the fifth fixed body (45) is fixedly connected to an inert gas tank (44), the side of the fifth fixed body (45) is penetrated by a gas delivery pipe (43), the other end of the gas delivery pipe (43) is communicated with the inert gas tank (44), the side of the fifth fixed body (45) is provided with a second limiting groove (47), a plurality of circumferentially arranged pressure sensors (49) are fixedly connected in the second limiting groove (47), the ends of the plurality of pressure sensors (49) are respectively fixedly connected to springs (48), the other ends of the plurality of springs (48) are fixedly connected to a flexible ring (410) that is slidably matched with the second limiting groove (47), the side of the flexible ring (410) is provided with a plurality of air outlet holes (411), and the rotating welding mechanism (3) includes a rotation groove (31) provided at the upper end of the main plate (1), a cavity (38) communicating with the rotation groove (31) provided at the upper end of the main plate (1), a fixing ring (32) rotatably connected to the main plate (1) in the cavity (38), the upper end of the fixing ring (32) is fixedly connected to two symmetrically arranged second fixing bodies (33), the upper ends of the two second fixing bodies (33) are respectively provided with a first limiting groove (35), the side surfaces of the two second fixing bodies (33) are fixedly connected to the first motor (34), the transmission shaft ends of the two first motors (34) are respectively fixedly connected to the threaded rods (37), and the side surfaces of the two threaded rods (37) are respectively connected to the limiting body (311) through threaded matching.The side surfaces of the two limiting bodies (311) are respectively slidably matched with the first limiting groove (35), the upper ends of the two limiting bodies (311) are respectively fixedly connected to the third electric telescopic rod (312), the telescopic end of one of the third electric telescopic rod (312) is fixedly connected to the third fixed body (313), the upper end of the third fixed body (313) is provided with a first empty groove (314), the third fixed body (313) is rotatably connected to the fourth electric telescopic rod (315) in the first empty groove (314), the side surface of the third fixed body (313) is fixedly connected to the third motor (316), the transmission shaft end of the third motor (316) is fixedly connected to the side surface of the fourth electric telescopic rod (315), and the telescopic end of the fourth electric telescopic rod (315) is fixedly connected to a sealed welder (317).

2. A high-precision welding CNC machine tool according to claim 1, characterized in that: The telescopic end of the other third electric telescopic rod (312) is fixedly connected to a fourth fixed body (318), a second slot (319) is provided on the side of the fourth fixed body (318), a fifth electric telescopic rod (321) is rotatably connected in the second slot (319), a fourth motor (320) is fixedly connected to the side of the fourth fixed body (318), a transmission shaft end of the fourth motor (320) is fixedly connected to the side of the fifth electric telescopic rod (321), and a sealed welder (317) is fixedly connected to the telescopic end of the fifth electric telescopic rod (321).

3. A high-precision welding CNC machine tool according to claim 1, characterized in that: A second motor (39) is fixedly connected in the cavity (38), a gear (310) is fixedly connected to a transmission shaft end of the second motor (39), and a gear ring (36) meshing with the gear (310) is fixedly connected to a side surface of the fixing ring (32).

4. A high-precision welding CNC machine tool according to claim 1, characterized in that: The mobile clamping mechanism (2) comprises two first electric telescopic rods (21) symmetrically arranged at the lower end of the main body plate (1), the telescopic ends of the four first electric telescopic rods (21) are respectively fixedly connected to the first fixed body (22), the lower ends of the four first fixed bodies (22) are respectively rotatably connected to the rollers (23), the upper end of the main body plate (1) is provided with four symmetrically arranged first placement grooves (24), the four first placement grooves (24) are respectively fixedly connected to the second electric telescopic rods (25), and the telescopic ends of the four second electric telescopic rods (25) are respectively fixedly connected to the limit blocks (26).

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