Welding numerical control machine tool

Abstract

The invention relates to the technical field of welding, and discloses a welding numerical control machine tool which comprises a machine tool platform and further comprises a workpiece clamping assembly, and the workpiece clamping assembly comprises two sleeves capable of being in butt joint and a three-point inner supporting actuator which is arranged on the two sleeves and can be adjusted in an opening or closing mode. The two groups of three-point inner support actuators are arranged in a staggered manner in the axial direction; the welding execution component is used for welding the butt seam of the two thin-walled pipes; and the air pressure differential assembly comprises a jet flow spray head arranged in the butt joint area of the two sections of thin-walled pipes and two backflow cavities located on the two sides of the jet flow spray head. According to the method, through a closed-loop detection path of opposite seam jet flow, double-side recovery and differential pressure judgment, the butt joint step of the thin-walled tube is converted into a quantifiable steady-state differential pressure signal, and the signal is modulated into a periodic quantity during rotation, so that online identification of the interference magnitude of the inner support is realized, and the effect of calibrating the roundness in real time without an additional measuring instrument is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding, in particular to a welding numerical control machine tool. BACKGROUND

[0002] A numerical control welding machine is an advanced manufacturing equipment that realizes the automation and precision of the welding process through a computer numerical control (CNC) system. It combines welding technology, numerical control technology, and robot technology and is widely used in industrial scenarios that require high welding quality and consistency.

[0003] Currently, in the butt welding process of thin-walled metal pipes, it is necessary to ensure that the axes of the two metal pipes coincide to make their circular end faces concentric, so as to ensure the welding quality; Therefore, a welding auxiliary device for precision mechanical part machining is disclosed in Chinese authorized patent publication No. CN118268809B. The device can centerally clamp the thin-walled pipe by setting two groups of outer expansion centering clamping assemblies, ensure the axial position of the thin-walled pipe, and then use the cooperation of the limiting cylinder and the limiting shaft to limit the axial position of the two groups of outer expansion centering clamping assemblies, thereby ensuring the axial coincidence of the two outer expansion centering clamping assemblies and the axial coincidence of the two thin-walled pipes, and improving the welding quality.

[0004] The device is aimed at the field of auxiliary positioning of workpieces before welding. However, it is difficult to control the force of the inner support in this way, and it is easy to cause excessive force of the inner support. For high-strength thin pipes, excessive force of the inner support only makes the fixation more stable. Then, for thin pipes with weak strength, excessive force of the inner support will cause the inner support to deform, resulting in the loss of circularity. Taking the disclosed case as an example, when the force of the three-point inner support is too large, it will cause the cross-section of the thin pipe to change from a circle to a triangle. Similarly, if it is a four-point inner support, it will change to a square. In this way, the butt-jointed thin pipes may be completed by the same force of the two pipes, but the cross-section of the welded pipe is no longer circular. Therefore, when the inner support force is removed after welding, the deformation of the thin pipe itself will exert an internal stress on the weld position, thereby burying hidden dangers in the subsequent weld. SUMMARY

[0005] The present application aims to provide a welding numerical control machine tool to solve at least one of the technical problems existing in the prior art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solution: a welding numerical control machine tool, comprising a machine tool platform, further comprising: Workpiece clamping assembly, comprising two butt-jointable sleeves, and three-point inner support actuators arranged on the sleeves and capable of being opened or closed for adjustment, the two sets of three-point inner support actuators being arranged axially offset from each other; Welding execution component for welding a butt joint of two thin-walled pipes; Air pressure differential assembly, comprising a jet nozzle arranged at a butt joint area of two thin-walled pipes and two return flow cavities arranged at two sides of the jet nozzle, the jet nozzle being used for jetting air flow at the butt joint position, and the two return flow cavities being used for taking return flow static pressure from two sides of the butt joint respectively and obtaining pressure components of the left and right sides.

[0007] Optionally, the air pressure differential assembly further comprises a fixing frame fixed on a top surface of a machine tool platform, an outer wall of the fixing frame is fixed with an equalizing cavity, the equalizing cavity is connected with an external air supply device, the jet nozzle is fixedly connected with an outer wall of the equalizing cavity in communication, and a differential pressure device is mounted on the outer wall of the fixing frame, and the two return flow cavities are connected with the differential pressure device through communication pipes.

[0008] Optionally, the workpiece clamping assembly further comprises two sliding shaft seats mounted on the top of the machine tool platform and capable of being adjusted to approach or move away from each other, and the two sleeves are rotatably mounted on the shaft centers of the two sliding shaft seats and driven by external structures. The three-point inner support actuator comprises a fixing ring fixed on an end of the sleeve, and further comprises an adjusting ring slidably mounted on an outer wall of the sleeve, two connecting rods rotatably connected between the fixing ring and the adjusting ring, and an inner support member mounted at a hinged joint between the two connecting rods.

[0009] Optionally, inner shafts are rotatably mounted on inner walls of the two sleeves, opposite ends of the two inner shafts are slidably inserted, a servo motor for driving the inner shafts to rotate is further mounted on one of the sliding shaft seats, a portion of an outer wall of the inner shaft is provided with a thread, a thread wedge is fixed on an inner wall of the adjusting ring and meshes with the thread, and a long groove is formed in the outer wall of the sleeve for the thread wedge to pass through and slide.

[0010] Optionally, sleeves are fixed on outer walls of opposite sides of the two sliding shaft seats, piston rings are slidably mounted on inner walls of the sleeves, the two ends of the inner shafts pass through the sleeves and the piston rings respectively, a cam groove is formed in the outer wall of the inner shaft in a head-to-tail manner, a slide pin is slidably mounted in the cam groove and fixed on the inner ring wall of the sleeve, a sealing space in the sleeve is connected with the equalizing cavity in one-way communication through a one-way air pipe, and a one-way air inlet hole is formed in the outer wall of the sleeve.

[0011] Optionally, the opposite end of the two sleeves is provided with a spline structure capable of sliding insertion, and the outer wall of one of the sleeves is further fixed with a transmission gear, which is in meshing transmission with an external gear driving member.

[0012] Optionally, the top surface of the machine tool platform is provided with a horizontal groove, and the two sliding shaft seats are slidingly installed in the horizontal groove. A guide rod is fixed in the horizontal groove and penetrates the two sliding shaft seats, and the guide rod is slidingly connected with the penetration positions of the two sliding shaft seats. A bidirectional screw rod driven by a servo motor is also rotatably installed in the horizontal groove, and the bidirectional screw rod penetrates the two sliding shaft seats and is threadedly connected with the penetration positions of the two sliding shaft seats.

[0013] Optionally, the contact point position of the inner support member and the sliding shaft seat is provided with a reserved length relative to the port position of the sliding shaft seat.

[0014] Optionally, the welding execution component is at least one of laser welding, argon arc welding, or electric arc welding.

[0015] Compared with the prior art, the present application has the following advantages: Firstly, the present application converts the butt joint step of a thin-walled pipe into a quantifiable steady-state pressure difference signal through a closed-loop detection path of "opposite jet flow - double-sided recovery - differential pressure determination", and modulates it into a periodic quantity in rotation, thereby realizing online identification of the interference amount of the inner support, achieving real-time calibration of roundness without additional measuring instruments, eliminating out-of-roundness and post-weld stress concentration caused by "over-supporting", and significantly improving the quality of one-time welding of ultra-thin-walled precision pipes.

[0016] Secondly, the present application arranges multiple groups of "connecting rod - wedge block" type three-point inner support actuators on the same sleeve, and uses the inner shaft thread - wedge block pair and the spline insertion structure to enable the servo motor to accurately adjust the tensioning force of each point in a static state, and to drive the workpiece to rotate at a uniform speed during the welding stage, thereby achieving the effects of uniform tensioning of the thin-walled pipe, no local indentation, and arbitrary adjustment of the welding position.

[0017] Thirdly, the present application directly converts mechanical energy into continuous pulsating supply of protective gas through a cam groove - piston ring mechanism by utilizing the rotational motion of the inner shaft, and alternately injects gas into the uniform pressure chamber from both sides, so that the jet flow nozzle always maintains laminar flow protection during the entire welding process, thereby eliminating the need for an independent air compressor and a flow valve group, achieving the effects of simplifying the gas circuit, reducing energy consumption, and simultaneously realizing the effects of back forming protection of the welding seam and self-sufficient gas source for differential pressure detection. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a front view of the present application; Figure 2 is a partial perspective view of the machine tool platform and the structure thereon of the present application; Figure 3Front view of the workpiece clamping assembly of the present application; Figure 4 Front view of the workpiece clamping assembly of the present application Figure 3 Front view of the workpiece clamping assembly of the present application Figure 5 Front view of the workpiece clamping assembly of the present application Figure 6 Front view of the workpiece clamping assembly of the present application Figure 7 Front view of the workpiece clamping assembly of the present application Figure 8 Front view of the workpiece clamping assembly of the present application Figure 9 Front view of the workpiece clamping assembly of the present application Figure 10 Front view of the workpiece clamping assembly of the present application Figure 11 Front view of the workpiece clamping assembly of the present application

[0019] In the figure: 1, machine tool platform; 2, welding execution component; 3, thin-walled pipe; 4, sliding shaft seat; 5, inner shaft; 6, sleeve; 7, fixed ring; 8, adjusting ring; 9, connecting rod; 10, inner support; 11, sleeve; 12, piston ring; 13, threaded wedge; 14, fixed frame; 15, uniform pressure cavity; 16, jet nozzle; 17, backflow cavity; 18, differential pressure device; 19, one-way air pipe; 20, cam groove; 21, sliding pin. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0021] Please refer to Figures 1 to 11 The present application provides a technical solution: a welding numerical control machine tool, comprising a machine tool platform 1, further comprising: A workpiece clamping assembly, the workpiece clamping assembly comprising two butt-jointable sleeves 6, and three-point inner support executors arranged on the two sleeves 6 and capable of being adjusted to open or close, the two groups of three-point inner support executors being arranged in axial staggered positions; A welding execution component 2, the welding execution component 2 being used for welding the butt joints of two thin-walled pipes 3, and the welding execution component 2 being at least one of laser welding, argon arc welding or electric arc welding; The air pressure differential assembly includes a jet nozzle 16 disposed in the docking area of ​​the two thin-walled tubes 3 and two return chambers 17 located on both sides thereon. The jet nozzle 16 is used to jet out airflow at the docking seam position, and the two return chambers 17 respectively take the return static pressure from both sides of the docking seam and obtain the pressure components on the left and right sides.

[0022] When using this welding CNC machine tool, the thin-walled tube 3 to be welded is first fixed by the workpiece clamping assembly. This involves inserting the thin-walled tube 3 into the sleeve 6 and using a three-point internal support actuator to radially tighten the inner wall of the thin-walled tube 3 from the inside, achieving precise centering and clamping. Then, the two sections of the thin-walled tube 3 are axially aligned to ensure a tight fit. Secondly, for thin tubes with lower strength, to avoid excessive internal support force from the three-point internal support actuator (which could also be four-point or five-point, but three-point is used in this case) causing the thin-walled tube 3 to become out of round, it is still necessary to inspect and calibrate it after internal support fixation to ensure the subsequent welding quality. The specific method is as follows: Activating the differential pressure assembly, the jet nozzle 16 sprays protective gas towards the joint, directing the airflow to the joint. The airflow is geometrically divided into three paths—through the joint (middle path) + along the two side pipe walls (left / right paths), as shown below. Figure 9 As shown, when there are steps (staggered) on both side walls, the flow resistance of the flow along the walls on both sides is different. Therefore, a static pressure difference ΔP is generated between the left and right return cavities 17. When the inner support actuator (or workpiece) is rotated, ΔP will change periodically, and its amplitude reflects the "over-support strength". Figure 10 and Figure 11 This indicates the degree of deformation of the thin-walled tube 3 when subjected to excessive internal support force. Figure 11 This is the viewing angle of the two thin-walled tubes 3 along the axial direction. At this point, it is necessary to adjust the internal support force of the three-point internal support actuator until the steps on both sides of the wall disappear, thus completing the adjustment process of the internal support force. Finally, the welding execution component 2 performs precision welding on the butt joint along a preset trajectory to complete the connection of the thin-walled tube 3.

[0023] In this way, the "staggered steps" can be converted into a robust differential pressure signal through "joint jetting - double-sided recovery - differential pressure judgment", and then "modulated" into a periodic quantity that is easy to lock into phase by rotating the inner support component, thereby accurately adjusting the inner support degree of the three-point inner support actuator.

[0024] In one preferred embodiment, an implementation of a pneumatic differential assembly is provided; The pneumatic differential assembly also includes a fixed frame 14 fixed on the top surface of the machine tool platform 1. A pressure equalization chamber 15 is fixed on the outer wall of the fixed frame 14 and the pressure equalization chamber 15 is connected to an external air supply device. A jet nozzle 16 is fixed on the outer wall of the pressure equalization chamber 15. A differential pressure device 18 is also installed on the outer wall of the fixed frame 14. Both return chambers 17 are connected to the differential pressure device 18 through connecting pipes.

[0025] For details, please refer to [link / reference]. Figure 7 and Figure 9 The external air supply device first injects air into the pressure equalization chamber 15, and after equalization in the pressure equalization chamber 15, it sprays out from the jet nozzle 16. The wall-adhering flow on both sides flows back to the two return chambers 17 respectively. The pressure difference in the two return chambers 17 is monitored by the differential pressure device 18, and then the pressure difference is determined.

[0026] It is worth mentioning that the interior of the return cavity 17 can be set as a small expansion cavity. The purpose is to reduce the velocity of the wall jet, leaving only static pressure, and then P can be measured.

[0027] In one preferred embodiment, an implementation of a workpiece clamping assembly is provided; The workpiece clamping assembly also includes two sliding bearings 4 mounted on the top of the machine tool platform 1 and adjustable to be close to or far from each other. Two sleeves 6 are rotatably mounted on the axes of the two sliding bearings 4 and are driven by an external structure. The three-point internal support actuator includes a fixed ring 7 fixed to the end of the sleeve 6, and an adjusting ring 8 installed on the outer wall of the sleeve 6 and adjustable by sliding. Three sets of two connecting rods 9 are rotatably connected between the fixed ring 7 and the adjusting ring 8, and an internal support member 10 is installed at the hinge point between the two connecting rods 9.

[0028] For details, please refer to [link / reference]. Figure 3 - Figure 6 After the thin-walled tube 3 is fitted onto the sleeve 6, the external structure moves and adjusts the adjusting ring 8 to move it closer to the fixed ring 7. The connecting rod 9 between them causes the inner support 10 to move centrifugally, thereby completing the inner support fixation of the thin-walled tube 3. Then, the two sliding bearings 4 are driven to approach each other by the external structure so that the two thin-walled tubes 3 are connected to each other. A certain gap is reserved before they are fully in contact to facilitate the subsequent inspection process. Then, the position of the adjusting ring 8 is adjusted according to the pressure difference detection of the air pressure differential component until the internal support force of the inner support member 10 on the thin-walled tube 3 makes the cross section of the thin-walled tube 3 in a circular state and then stops. Finally, the final welding is completed after the two thin-walled tubes 3 are fully butted together.

[0029] It is worth mentioning that the three-point internal support actuators can also be designed side by side on the sleeve 6, with two or three sets, depending on the length of the thin-walled tube 3. Moreover, the three-point internal support actuators on the same sleeve 6 are designed synchronously, which ensures that the three-point internal support actuators between the two sleeves 6 are distributed in a cross pattern.

[0030] In one preferred embodiment, an implementation method for adjusting the position of the regulating ring 8 is provided; The inner walls of both sleeves 6 are rotatably mounted with inner shafts 5, and the opposite ends of the two inner shafts 5 can be slidably inserted. A servo motor for driving the rotation of the inner shaft 5 is also mounted on one of the sliding shaft seats 4. A thread is opened on part of the outer wall of the inner shaft 5. A threaded wedge 13 that meshes with the thread is fixed on the inner wall of the adjusting ring 8. A long groove is opened on the outer wall of the sleeve 6 for the threaded wedge 13 to pass through and slide and limit.

[0031] For details, please refer to [link / reference]. Figure 4 and Figure 6 When the two sliding bearing seats 4 approach each other, the opposite ends of the two sleeves 6 and the two inner shafts 5 will slide and insert into each other, specifically by using spline insertion, so that the sleeves 6 and inner shafts 5 after docking can form a whole shaft. Secondly, see Figure 8 The outer wall of the inner shaft 5 is provided with an annular groove, while the inner wall of the sleeve 6 is fixed with an inner ring embedded in the annular groove. This design allows the inner shaft 5 and the sleeve 6 to move synchronously in the axial direction, while also being able to rotate relative to each other. Therefore, when the servo motor drives the inner shaft 5 to rotate, the sleeve 6 remains stationary due to the stop of the external drive structure. At this time, through the meshing action between the thread on the outer wall of the inner shaft 5 and the threaded wedge 13, the adjusting ring 8 can be driven to make axial adjustment along the sleeve 6, thereby achieving the purpose of adjusting the degree of inner support of the inner support 10.

[0032] When the inner shaft 5 and the sleeve 6 rotate simultaneously under the drive of the servo motor and the external drive assembly, the inner support 10 and the thin-walled tube 3 can rotate, while maintaining the inner support function, so as to cooperate with the pneumatic differential assembly to complete the detection. In one preferred embodiment, a method for continuously injecting gas into the pressure equalization chamber 15 is provided; Both sliding shaft seats 4 have sleeves 11 fixed on their opposite outer walls. Piston rings 12 are slidably installed on the inner walls of both sleeves 11. Both ends of the inner shaft 5 pass through the sleeves 11 and the piston rings 12 respectively. The outer wall of the inner shaft 5 has a cam groove 20 that connects the two ends. The inner ring wall of the sleeve 11 has a sliding pin 21 that is slidably installed in the cam groove 20. The sealing space inside the sleeve 11 is unidirectionally connected to the pressure equalization chamber 15 through a one-way air pipe 19. The outer wall of the sleeve 11 also has a one-way air inlet.

[0033] For details, please refer to [link / reference]. Figure 7 and Figure 8During the process of the inner shaft 5 and the sleeve 6 being driven to rotate simultaneously, causing the thin-walled tube 3 to rotate, the rotation of the inner shaft 5 will also cause the piston ring 12 to slide back and forth in the sleeve 11 through the sliding fit between the cam groove 20 on it and the sliding pin 21 on the inner wall of the piston ring 12, thereby drawing gas into the internal sealed space through the one-way air inlet, and then injecting it into the pressure equalization chamber 15 through the one-way air pipe 19. Among them, the piston rings 12 inside the two sleeves 11 on both sides are designed to face each other, so that the sealed space inside the two sleeves 11 alternately injects air into the pressure equalization chamber 15, thereby ensuring continuous air injection in the pressure equalization chamber 15, and thus enabling the jet nozzle 16 to continuously spray air.

[0034] In one preferred embodiment, the two sleeves 6 are provided with a slidable spline structure at their opposite ends, and a transmission gear is fixed to the outer wall of one of the sleeves 6, which meshes with an external gear drive component for transmission.

[0035] For details, please refer to [link / reference]. Figure 3 and Figure 4 The two sleeves 6 are also connected by splines. When the transmission gear is driven by an external gear drive (the motor shaft fixed gear and meshes with the transmission gear), the two sleeves 6 can be driven to rotate together.

[0036] In one preferred embodiment, an implementation method is provided for controlling the two sliding bearings 4 to be adjusted relative to or away from each other; The top surface of the machine tool platform 1 is provided with a transverse groove, and two sliding shaft seats 4 are slidably installed in the transverse groove. A guide rod is fixed in the transverse groove, passing through the two sliding shaft seats 4 and slidably connected to them at the point of penetration. A bidirectional screw driven by a servo motor is also rotatably installed in the transverse groove. The bidirectional screw passes through the two sliding shaft seats 4 and is threadedly connected to the point of penetration of the two sliding shaft seats 4.

[0037] In one preferred embodiment, the contact point between the inner support 10 and the sliding shaft seat 4 is reserved with a length relative to the port position of the sliding shaft seat 4.

[0038] The standard parts used in this embodiment can be purchased directly from the market, while the non-standard structural parts described in the specification and drawings can be processed directly based on existing technical knowledge without any doubt. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A welding CNC machine tool, comprising a machine tool platform (1), characterized in that, Also includes: The workpiece clamping assembly includes two sleeves (6) that can be mated, and a three-point internal support actuator disposed on the two sleeves (6) and adjustable for opening or closing. The two sets of the three-point internal support actuators are arranged offset from each other in the axial direction. Welding execution component (2), which is used for welding the butt joint of two thin-walled tubes (3); The differential pressure assembly includes a jet nozzle (16) disposed in the docking area of ​​two thin-walled tubes (3) and two return chambers (17) located on both sides thereon. The jet nozzle (16) is used to jet out airflow at the docking seam. The two return chambers (17) respectively take back static pressure from both sides of the docking seam and obtain pressure components on the left and right sides.

2. The welding CNC machine tool according to claim 1, characterized in that: The pneumatic differential assembly also includes a fixed frame (14) fixed on the top surface of the machine tool platform (1). The outer wall of the fixed frame (14) is fixed with a pressure equalization chamber (15), and the pressure equalization chamber (15) is connected to an external air supply device. The jet nozzle (16) is connected and fixed on the outer wall of the pressure equalization chamber (15). The outer wall of the fixed frame (14) is also equipped with a differential pressure device (18). Both return chambers (17) are connected to the differential pressure device (18) through a connecting pipe.

3. The welding CNC machine tool according to claim 2, characterized in that: The workpiece clamping assembly also includes two sliding bearings (4) mounted on the top of the machine tool platform (1) and adjustable to be close to or far from each other. The two sleeves (6) are respectively rotatably mounted on the axis of the two sliding bearings (4) and are both driven by an external structure. The three-point internal support actuator includes a fixed ring (7) fixed to the end of the sleeve (6) and an adjusting ring (8) installed on the outer wall of the sleeve (6) and adjustable. Three sets of two connecting rods (9) are rotatably connected between the fixed ring (7) and the adjusting ring (8), and an internal support member (10) is installed at the hinge point between the two connecting rods (9).

4. The welding CNC machine tool according to claim 3, characterized in that: The inner walls of both sleeves (6) are rotatably mounted with inner shafts (5), and the opposite ends of the two inner shafts (5) can be slidably inserted. A servo motor for driving the inner shaft (5) to rotate is also mounted on one of the sliding shaft seats (4). A thread is opened on part of the outer wall of the inner shaft (5). A threaded wedge (13) that meshes with the thread is fixed on the inner wall of the adjusting ring (8). A long groove is opened on the outer wall of the sleeve (6) for the threaded wedge (13) to pass through and slide.

5. The welding CNC machine tool according to claim 4, characterized in that: Both of the sliding shaft seats (4) have sleeves (11) fixed on their opposite outer walls. Both of the sleeves (11) have piston rings (12) slidably installed on their inner walls. The two ends of the inner shaft (5) pass through the sleeves (11) and the piston rings (12) respectively. The outer wall of the inner shaft (5) has a cam groove (20) connected end to end. The inner ring wall of the sleeve (11) has a sliding pin (21) slidably installed in the cam groove (20). The sealing space in the sleeve (11) is unidirectionally connected to the pressure equalization chamber (15) through a one-way air pipe (19). The outer wall of the sleeve (11) also has a one-way air inlet.

6. The welding CNC machine tool according to claim 3, characterized in that: The two sleeves (6) are provided with a spline structure that can be slidably inserted at one end, and a transmission gear is fixed on the outer wall of one of the sleeves (6), which meshes with an external gear drive.

7. The welding CNC machine tool according to claim 3, characterized in that: The top surface of the machine tool platform (1) is provided with a transverse groove, and the two sliding shaft seats (4) are slidably installed in the transverse groove. A guide rod is fixed in the transverse groove, passing through the two sliding shaft seats (4) and slidably connected to them at the point of penetration. A bidirectional screw driven by a servo motor is also rotatably installed in the transverse groove. The bidirectional screw passes through the two sliding shaft seats (4) and is threadedly connected to the point of penetration of the two sliding shaft seats (4).

8. The welding CNC machine tool according to claim 3, characterized in that: The contact point between the inner support (10) and the sliding shaft (4) has a reserved length relative to the port position of the sliding shaft (4).

9. The welding CNC machine tool according to any one of claims 1-8, characterized in that: The welding execution component (2) is at least one of laser welding, argon arc welding or electric arc welding.

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