CN219787112U

CN219787112U - Pipeline welding auxiliary assembly

Info

Publication number: CN219787112U
Application number: CN202321037703.2U
Authority: CN
Inventors: 席晋辉; 张振亚; 张永伟; 袁波; 刘奎林; 郑灼光; 王硕
Original assignee: China Nuclear Industry 23 Construction Co Ltd
Current assignee: China Nuclear Industry 23 Construction Co Ltd
Priority date: 2023-05-04
Filing date: 2023-05-04
Publication date: 2023-10-03
Anticipated expiration: 2033-05-04

Abstract

The utility model relates to the technical field of pipeline welding, in particular to pipeline welding auxiliary equipment, wherein two ends of a flexible soft connecting piece are respectively connected with one sealing device, after the driving device drives the sealing devices to move to the designated positions of a region to be welded, the two ends of a pipeline are blocked by the sealing devices Zhang Kaifeng, a local sealing space of the region to be welded is established, argon is then filled until the argon is filled to meet the welding requirement, the welding operation can be started, after the welding is finished, the sealing is released by the shrinkage of the sealing devices, the pipeline is opened, and when the flaw detection quality is unqualified, the pipeline can still be sealed again, so that the problem that a bulge generated after the manual installation auxiliary workpiece is not normally pushed in from one end of the pipeline is solved. The auxiliary equipment for pipeline welding solves the technical problem that in the process of pipeline welding in the prior art, the whole welding efficiency is affected by manually installing an auxiliary workpiece to establish a sealed argon chamber.

Description

Pipeline welding auxiliary assembly

Technical Field

The utility model relates to the technical field of pipeline welding, in particular to pipeline welding auxiliary equipment.

Background

With the continuous development of the nuclear power industry, a pipeline is used as a common transportation carrier, two sections of pipelines are required to be welded frequently, argon filling is required to be carried out in the pipeline in the welding process, and the pipeline is used for preventing metal on the back of a welding line from being oxidized in the welding process.

In the prior art, the pipeline welding process adopts the manual installation auxiliary workpiece to seal the back argon filling generally, the operation is too loaded down with trivial details, the gas waste is more serious, the auxiliary workpiece that adopts when sealing is a foam board, the foam board contains partial metal material, can produce the shadow when detecting a flaw after the welding is accomplished, influence the accuracy of detecting a flaw, if take down the foam board before detecting a flaw, if detect a flaw disqualified, when needing to install the foam board again, because the pipeline inside that the welding point is located can form one section arch after the welding, lead to the foam board unable to advance to wait the welding point inboard from pipeline one end, need repeat welding work after cutting unqualified welding seam, influence whole welding efficiency.

Disclosure of Invention

The utility model provides auxiliary equipment for pipeline welding, which solves the technical problem that argon is filled after an auxiliary workpiece is installed by a manual hand in the prior art so as to influence the overall welding efficiency.

(II) technical scheme

In order to solve the technical problems, an embodiment of the utility model provides pipeline welding auxiliary equipment, which comprises a flexible soft connecting piece, a driving device and a sealing device;

the flexible soft connecting piece is made of a flexible steel wire rope and a high-temperature-resistant wire, two ends of the flexible soft connecting piece are respectively connected with one sealing device, and the sealing devices can stretch and retract along the radial direction of the flexible soft connecting piece so as to seal and open a pipeline;

the axis of the flexible soft connecting piece is parallel to or coincides with the axis of the pipeline, at least one driving device is connected with the sealing device or the flexible soft connecting piece, and the driving device is used for driving the flexible soft connecting piece to move in the pipeline along the length direction of the flexible soft connecting piece.

Further, the driving device comprises a shell, a driving motor and a driving wheel;

the driving motor is arranged in the shell, the driving wheel is arranged on the shell and can stretch and retract along the radial direction of the flexible soft connecting piece, the driving motor is in transmission connection with the driving wheel so as to drive the driving wheel to rotate, and the rotation direction of the driving wheel is the same as the axial direction of the flexible soft connecting piece.

Further, the driving device further comprises a connecting rod and an elastic piece, one end of the connecting rod is fixed in the shell, and the other end of the connecting rod is in transmission connection with the driving wheel through a first rotating shaft; one end of the elastic piece is connected with the connecting rod, and the other end of the elastic piece is connected with the inner wall of the shell.

Further, the driving device further comprises a transmission mechanism, the driving motor is connected with the driving wheel through the transmission mechanism, and the transmission mechanism, the driving wheel and the driving motor are in one-to-one correspondence.

Further, the transmission mechanism comprises a first bevel gear, a second bevel gear and a synchronous belt; the first bevel gear is meshed with the second bevel gear, the synchronous belt is positioned in the connecting rod, the second bevel gear is connected with the driving wheel through the synchronous belt, and the first bevel gear is connected with an output shaft of the driving motor.

Further, the sealing device comprises a rotating motor, a motor box, rotating blades and a windshield; the rotating motor is arranged in the motor box;

the rotating blades are arranged along the radial direction of the flexible soft connecting piece, one end of each rotating blade is connected with the rotating motor, and the rotating motor drives the rotating blades to rotate so as to enable the rotating blades to expand or contract along the radial direction of the flexible soft connecting piece;

the wind shield is connected with the rotating blades, and the rotating blades shrink or expand to drive the wind shield to shrink or expand synchronously so as to seal or open the pipeline.

Further, the sealing device further comprises a turntable, a second rotating shaft and a limiting pin;

the output shaft of rotating electrical machines with the shaft hole cooperation at carousel middle part, be provided with a plurality of interval distribution's second pivot on the carousel, every the second pivot respectively with one rotating vane rotates to be connected, the through-hole has been seted up at rotating vane middle part, spacer pin one end with the motor box links to each other, and the other end passes the through-hole, just the spacer pin can be in remove in the through-hole.

Further, the rotary blade is provided with a first end and a second end which are opposite, the first end is rotationally connected with the corresponding second rotating shaft, the second end is arc-shaped, and the tracks of the second ends of the rotary blades are located on the same circumference.

Further, the rotary blade includes a first clip and a second clip, and the windshield is made of an elastic material and is clamped between the first clip and the second clip;

and the windshield is disc-shaped, and the track of the outer edge of the windshield coincides with the track of the second ends of the plurality of rotating blades.

Further, three supporting wheels are respectively connected to the outer side wall of the motor box and the outer side wall of the driving device along the circumferential direction;

the supporting wheel is connected with the motor box and the driving device through a telescopic rod respectively, and a damping spring is arranged in the telescopic rod and used for radially stretching and retracting the supporting wheel along the flexible soft connecting piece.

The utility model has the beneficial effects that: the utility model provides auxiliary equipment for pipeline welding, which comprises a flexible soft connecting piece, a driving device and a sealing device; the flexible soft connecting piece both ends respectively are connected with one sealing device, drive arrangement drives after sealing device removes to wait the regional assigned position of welding, through sealing device shutoff pipeline's both ends establish the regional local sealed space of waiting the welding point, fill argon gas afterwards, just can start the welding operation after the argon gas fills and satisfies the welding requirement, after the welding is accomplished, through sealing device releases the seal, and the pipeline is opened, when the quality of detecting a flaw is unqualified, still can get into the pipeline again and seal, has solved the auxiliary workpiece of manual installation because the protruding situation of pushing can't follow one end of pipeline that produces after the welding. The auxiliary equipment for pipeline welding solves the technical problem that in the process of pipeline welding in the prior art, the whole welding efficiency is affected by establishing a sealed argon chamber after manually installing an auxiliary workpiece.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the overall appearance and structure of an auxiliary device for welding a pipeline according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of an internal structure of a driving device of a pipeline welding auxiliary device according to an embodiment of the present utility model;

FIG. 3 is a schematic structural diagram of a sealing device for auxiliary equipment for welding a pipeline according to an embodiment of the present utility model;

fig. 4 is a schematic structural view of a rotary blade of an auxiliary device for welding a pipeline according to an embodiment of the present utility model.

Icon: 1-a flexible soft connection; 2-a driving device; 201-a housing; 202-a drive wheel; 203-a connecting rod; 204-an elastic member; 205-a transmission mechanism; 2051-a first bevel gear; 2052-a second bevel gear; 3-sealing means; 301-a motor box; 302-rotating the blades; 3021-a first clip; 3022-a second clip; 303-a windshield; 304-a turntable; 305-a second spindle; 306-a limiting pin; 4-supporting wheels; 401-telescoping rod; 402-shock absorbing springs.

Detailed Description

The technical solutions of the present utility model will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the communication may be direct or indirect through an intermediate medium, or may be internal to two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. Furthermore, in the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

As shown in fig. 1, the utility model provides a pipeline welding auxiliary device, which comprises a flexible soft connecting piece 1, a driving device 2 and a sealing device 3; the flexible soft connecting piece 1 is made of a flexible steel wire rope and a high-temperature-resistant wire, two ends of the flexible soft connecting piece 1 are respectively connected with one sealing device 3, and the sealing devices 3 can stretch and retract along the radial direction of the flexible soft connecting piece 1 so as to seal and open a pipeline; the axis of the flexible soft connecting piece 1 is parallel to or coincides with the axis of the pipeline, at least one driving device 2 is connected with the sealing device 3 or the flexible soft connecting piece 1, and the driving device 2 is used for driving the flexible soft connecting piece 1 to move in the pipeline along the length direction of the flexible soft connecting piece 1.

In this embodiment, each driving device is required to ensure synchronous forward movement, backward movement or speed change, the driving device 2 provides power for the whole welding auxiliary equipment to travel in a pipeline, backward movement and speed change, and the power device of the welding auxiliary equipment provides guarantee for the welding auxiliary equipment to normally travel in a horizontal straight pipe or a horizontal bent pipe; after the driving device 2 drives the sealing device 3 to move to the appointed position of the area to be welded, two ends of the pipeline are blocked by the sealing device 3, a local sealing space of the area to be welded is established, argon is then filled, the welding operation can be started until the argon is filled to meet the welding requirement, and after the welding is finished, the sealing is released by the sealing device 3, and the pipeline is opened. The pipeline welding device has the advantages that the technical problems of low overall welding efficiency and low welding quality caused by the fact that the sealing space is established by manually installing auxiliary workpieces in the pipeline welding process in the prior art are effectively solved.

Optionally, in this embodiment, the flexible soft connecting piece 1 is formed by a flexible steel wire rope and a high-temperature-resistant wire, and because the bent pipe needs to be able to turn, the flexible soft connecting piece 1 is formed by a flexible steel wire rope and a high-temperature-resistant wire together.

Alternatively, in the present embodiment, at least one driving device 2 is provided; when one driving device 2 is arranged, the driving device can be connected with one sealing device 3 at one end of the upright post, and when two driving devices 2 are arranged, the driving devices can be in one-to-one correspondence with the sealing devices 3 at two ends of the flexible soft connecting piece 1 or are arranged at one end of the driving devices, so that the purpose of the driving device is not deviated from the design concept of the utility model, and the driving device belongs to the protection scope of the utility model.

Optionally, in this embodiment, a control system may further be provided, where the control system includes a controller and a display, and the controller and the display may be used to control the pipeline welding auxiliary device in real time, display information, and enable real-time fault communication. All the commands required for the welding auxiliary equipment can be executed by means of the control system, preferably the control contains all necessary operating and monitoring elements, such as a joystick, switches, and indicating keys, etc.; the display can be an electronic product such as a mobile phone or a tablet personal computer.

Preferably, in this embodiment, a high-definition camera is mounted at the head of the auxiliary device for welding a pipeline, so that the internal environment of the pipeline can be surveyed, the position of a welded junction can be identified and precisely positioned in the running process, the high-definition camera is electrically connected with a display in the hand of an operator outside the pipeline, and the internal condition of the pipeline can be transmitted to the display in the hand of the operator in real time, so that the operator can monitor the internal condition of the pipeline in real time; the high-definition camera is also electrically connected with the controller, and can perform a fixed-point photographing function through remote control.

In this embodiment, the ends of the driving device 2 adjacent to the sealing device 3 are respectively provided with connectors that can correspond to each other. Preferably, the connecting piece can be a ring buckle and a quick-connection plug, so that the ring buckle and the quick-connection plug can be connected together.

Optionally, in this embodiment, the connection manner between the driving device 2 and the sealing device 3 may be a connection manner, such as a link, a hanging connection, or the like, or the flexible soft connection member 1 may directly penetrate through the sealing device 3 to be connected with the driving device 2, and the two may be connected by the connection manner, which does not deviate from the design concept of the present utility model and should be within the scope of protection of the present utility model.

As shown in fig. 2, the driving device 2 includes a housing 201, a driving motor and a driving wheel 202, the driving motor is mounted in the housing 201, the driving wheel 202 is mounted on the housing 201 and is capable of extending and retracting along a radial direction of the flexible connection member 1, the driving motor is in transmission connection with the driving wheel 202 so as to drive the driving wheel 202 to rotate, and a rotation direction of the driving wheel 202 is the same as an axial direction of the flexible connection member 1.

In this embodiment, the driving motor is installed in the housing 201 to drive the driving wheel 202 to rotate, the driving wheel 202 is installed on the housing 201, and the driving wheel 202 can rotate along the axial direction of the housing 201, so as to drive the welding auxiliary device to travel in the pipeline.

Preferably, in order to drive the welding auxiliary device to walk normally in the horizontal straight pipe or the horizontal curved pipe, the driving device is required to have uniform speed and strong pipeline adaptability, so that three driving wheels 202 are arranged on the outer wall of the driving device 2 in a mode of uniformly distributing at three points of circumference.

As shown in fig. 2, the driving device 2 further includes a connecting rod 203 and an elastic member 204, wherein one end of the connecting rod 203 is fixed in the housing 201, and the other end is in transmission connection with the driving wheel 202 through a first rotating shaft; the elastic member 204 has one end connected to the connecting rod 203 and the other end connected to the inner wall of the housing 201.

In this embodiment, one end of the connecting rod 203 is fixed in the housing 201, the other end is in transmission connection with the driving wheel 202 through a rotating shaft, and a cylindrical protruding connecting post is further disposed in the driving device 2 for hooking the elastic member 204. One end of the elastic member 204 bypasses the connecting column and is fixed inside the driving device 2, and the other end is hung on the casing of the driving wheel 202. In order to ensure that the welding auxiliary device can smoothly turn through a curve in a pipeline, the height position of the driving wheel 202 in the radial direction of the driving device 2 needs to be adjusted when the welding auxiliary device turns, so the driving wheel 202 needs to have the capacity of pre-tightening and reducing, the elastic piece 204 is used for providing elastic potential energy for the stretching and retraction of the driving wheel 202, so that the driving wheel 202 can stretch and retract along the radial direction of the driving device 2, and the height position of the driving wheel 202 in the radial direction of the driving device 2 can be adjusted through the connecting rod 203 connected with the driving wheel 202.

Alternatively, the elastic member 204 may be a torsion spring or elastic rubber, and the shape of the connecting post may be a cylindrical protrusion, a diamond protrusion, a T-shaped protrusion, or other protrusions that are easy to connect, which does not depart from the spirit of the present utility model and is intended to be within the scope of the present utility model.

As shown in fig. 2, the driving device 2 further includes a transmission mechanism 205, the driving motor is connected to the driving wheel 202 through the transmission mechanism 205, and the transmission mechanism 205, the driving wheel 202 and the driving motor are in one-to-one correspondence. The transmission mechanism 205 includes a first bevel gear 2051, a second bevel gear 2052, and a timing belt; the first bevel gear 2051 is meshed with the second bevel gear 2052, the synchronous belt is positioned in the connecting rod 203, the second bevel gear 2052 is connected with the driving wheel 202 through the synchronous belt, and the first bevel gear 2051 is connected with an output shaft of the driving motor.

In this embodiment, the driving wheel 202 is driven to rotate by mutual transmission among various components in the transmission mechanism 205, so that sufficient power can be obtained by running, backing or speed changing in a pipeline, the transmission mechanism 205 specifically includes the first bevel gear 2051, the second bevel gear 2052 and a synchronous belt, wherein the center of the first bevel gear 2051 is rotationally connected with an output shaft of the driving motor, and then the first bevel gear 2051 is driven to rotate by the driving motor, the first bevel gear 2051 drives the second bevel gear 2052 to obtain power in a meshing driving manner, the synchronous belt of the second bevel gear 2052 is connected with the driving wheel 202, and under the driving of the first bevel gear 2051, the second bevel gear 2052 transmits the power to the driving wheel 202 through the synchronous belt, so that the driving wheel 202 obtains the power, and the whole welding auxiliary equipment can be driven to run, backing or speed changing in the pipeline.

As shown in fig. 3 to 4, the sealing device 3 includes a rotary electric machine, a motor case 301, a rotary blade 302, and a windshield 303; the rotating electric machine is mounted in the motor case 301; the rotating blades 302 are arranged along the radial direction of the flexible soft connecting piece 1, one end of each rotating blade 302 is connected with the rotating motor, and the rotating motor drives the rotating blades 302 to rotate so as to enable the rotating blades 302 to expand or contract along the radial direction of the flexible soft connecting piece 1; the wind shield 303 is connected with the rotating blades 302, and the rotating blades 302 are contracted or expanded to drive the wind shield 303 to be synchronously contracted or expanded so as to seal or open the pipeline.

In this embodiment, the rotating blades 302 are disposed along the radial direction of the flexible connection unit 1, and one end of the rotating blades 302 is connected to the rotating motor, so that the rotating blades 302 are driven to rotate by the rotating motor, thereby expanding and contracting the rotating blades 302, and the wind shield 303 is connected to the rotating blades 302 and synchronously expands or contracts with the optional blades, thereby sealing or opening the pipeline.

In this embodiment, the sealing device 3 further includes a turntable 304, a second rotating shaft 305, and a limiting pin 306; the output shaft of rotating electrical machines with the shaft hole cooperation in carousel 304 middle part, be provided with a plurality of interval distribution's second pivot 305 on the carousel 304, every second pivot 305 respectively with one rotating vane 302 rotates to be connected, the through-hole has been seted up at rotating vane 302 middle part, spacer pin 306 one end with the motor box links to each other, and the other end passes the through-hole, just spacer pin 306 can be in the through-hole internal movement.

Optionally, the turntable 304 is located at the bottom of the motor box 301, a shaft hole in the middle of the turntable 304 is connected with an output shaft of the rotating motor in a matching manner, and a plurality of second rotating shafts 305 distributed at intervals are disposed on the turntable 304, each second rotating shaft 305 is respectively connected with one rotating blade 302 in a rotating manner, and is used for providing power and direction for the rotation of the rotating blade 302, a through hole is formed in the middle of the rotating blade 302, one end of the limiting pin 306 is connected with the motor casing, the other end of the limiting pin passes through the through hole, and the limiting pin 306 can move in the through hole, so that the positions of opening and shrinking of the rotating blade 302 and the windshield 303 can be limited.

Preferably, the second rotating shafts 305 are uniformly distributed on the turntable 304, and the through holes adopt circular arc tracks and are slightly larger than the limiting pins 306.

In this embodiment, the rotating blade 302 has a first end and a second end opposite to each other, the first end is rotationally connected to the corresponding second rotating shaft 305, the second end is arc-shaped, and the tracks of the second ends of the rotating blades 302 are on the same circumference.

In this embodiment, the rotating blade 302 includes a first clamping piece 3021 and a second clamping piece 3022, the wind shield 303 is made of an elastic material and is clamped between the first clamping piece 3021 and the second clamping piece 3022, the wind shield 303 is in a disc shape, and the track of the outer edge of the wind shield 303 coincides with the tracks of the second ends of the plurality of rotating blades 302.

Before welding, the rotating motor drives the rotating blades 302 to rotate and open to a required limiting point, so that the wind shield 303 can be completely opened, an air leakage opening is blocked, sealing of a required argon chamber is completed, after welding is completed, the rotating motor drives the rotating blades 302 to shrink to the limiting point, and then the wind shield 303 is driven to retreat to the limiting point, and opening of the argon chamber is completed.

Preferably, the plurality of rotating blades 302 are uniformly distributed along the circumferential direction of the output shaft of the driving motor, the wind shield 303 is made of elastic rubber, and is clamped between the first clamping piece 3021 and the second clamping piece 3022, and is in a disc shape, and the edge track of the wind shield 303 coincides with the track where the second ends of the plurality of rotating blades 302 are located, so that the wind shield and the rotating blades 302 can be retracted together to seal and open the pipeline.

As shown in fig. 1 to 3, the outer side wall of the motor box 301 and the outer side wall of the driving device 2 are respectively connected with three supporting wheels 4 along the circumferential direction; the supporting wheel 4 is respectively connected with the motor box 301 and the driving device 2 through a telescopic rod 401, and a damping spring 402 is arranged in the telescopic rod 401 and used for radially stretching and retracting the supporting wheel 4 along the flexible soft connecting piece 1.

In this embodiment, the supporting wheels 4 are disposed on the outer side walls of the driving device 2 and the motor box 301, and are fixedly connected with the driving device and the motor box through a telescopic rod 401, and damping springs 402 are disposed inside the telescopic rod 401. Preferably, the supporting wheels 4 are arranged in a circumferential three-point manner, the included angle between each supporting wheel is 60 °, in order to ensure that the driving device 2 and the sealing device 3 can be automatically centered in the walking process, besides the driving wheels 202, the supporting wheels 4 are uniformly distributed, and the supporting wheels 4 also need to have the diameter-changing capability, so that the supporting wheels 4 are designed to have the expansion and contraction mode of the damping springs 402, that is, the function of expanding or contracting is realized in the mode of the damping springs 402, under the action of the supporting wheels 4, the driving wheels 202 are tightly pressed on the inside of a pipeline, and meanwhile, the interference of unbalanced couples of the driving device 2 and the sealing device 3 in the moving process is counteracted by using the symmetry of the mechanism, so that all forces are concentrated on a vertical plane where the running axis of the driving motor is located. Meanwhile, the proper distance between the gravity center of the driving device 2 and the operation axis of the driving motor is ensured on a vertical plane passing through the axis of the motor, and the stability of the whole driving device 2 and the sealing device 3 in the operation process is ensured.

The auxiliary equipment for pipeline welding provided by the utility model has the advantages that in the process of pipeline internal operation, the parts which possibly contact with the pipeline wall are not polluted, all parts materials do not contain carbon steel elements, the content of halogen elements (CL, F, I) and the like meets the technical requirements, and the content is not more than 0.25 percent

The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.

Claims

1. The auxiliary pipeline welding equipment is characterized by comprising a flexible soft connecting piece (1), a driving device (2) and a sealing device (3);

the flexible soft connecting piece (1) is made of a flexible steel wire rope and a high-temperature-resistant wire, two ends of the flexible soft connecting piece (1) are respectively connected with one sealing device (3), and the sealing devices (3) can stretch and retract along the radial direction of the flexible soft connecting piece (1) so as to seal and open a pipeline;

the axis of the flexible soft connecting piece (1) is parallel to or coincides with the axis of the pipeline, at least one driving device (2) is connected with the sealing device (3) or the flexible soft connecting piece (1), and the driving device (2) is used for driving the flexible soft connecting piece (1) to move in the pipeline along the length direction of the flexible soft connecting piece (1).

2. A pipe welding auxiliary device according to claim 1, characterized in that the drive means (2) comprise a housing (201), a drive motor and a drive wheel (202);

the driving motor is installed in the shell (201), the driving wheel (202) is installed on the shell (201) and can stretch out and draw back along the radial direction of the flexible soft connecting piece (1), the driving motor is in transmission connection with the driving wheel (202) so as to drive the driving wheel (202) to rotate, and the rotation direction of the driving wheel (202) is the same as the axial direction of the flexible soft connecting piece (1).

3. A pipe welding auxiliary device according to claim 2, characterized in that the driving means (2) further comprises a connecting rod (203) and an elastic member (204), one end of the connecting rod (203) being fixed in the housing (201) and the other end being in driving connection with the driving wheel (202) via a first rotation shaft; one end of the elastic piece (204) is connected with the connecting rod (203), and the other end is connected with the inner wall of the shell (201).

4. A pipe welding auxiliary device according to claim 3, characterized in that the driving means (2) further comprises a transmission mechanism (205), the driving motor is connected to the driving wheel (202) through the transmission mechanism (205), and the transmission mechanism (205), the driving wheel (202) and the driving motor are in one-to-one correspondence.

5. The pipe welding auxiliary device according to claim 4, wherein the transmission mechanism (205) comprises a first bevel gear (2051), a second bevel gear (2052) and a timing belt; the first bevel gear (2051) is meshed with the second bevel gear (2052), the synchronous belt is positioned in the connecting rod (203), the second bevel gear (2052) is connected with the driving wheel (202) through the synchronous belt, and the first bevel gear (2051) is connected with an output shaft of the driving motor.

6. A pipe welding auxiliary device according to claim 1, characterized in that the sealing means (3) comprise a rotating electrical machine, a motor box (301), rotating blades (302) and a windscreen (303); the rotating electric machine is mounted in the motor box (301);

the rotating blades (302) are arranged along the radial direction of the flexible soft connecting piece (1), one end of each rotating blade (302) is connected with the rotating motor, and the rotating motor drives the rotating blades (302) to rotate so that the rotating blades (302) can be expanded or contracted along the radial direction of the flexible soft connecting piece (1);

the wind shield (303) is connected with the rotating blades (302), and the rotating blades (302) shrink or expand to drive the wind shield (303) to shrink or expand synchronously so as to seal or open the pipeline.

7. A pipe welding auxiliary device according to claim 6, characterized in that the sealing means (3) further comprises a turntable (304), a second rotation shaft (305) and a stop pin (306);

the output shaft of rotating electrical machines with shaft hole cooperation at carousel (304) middle part, be provided with a plurality of interval distribution's second pivot (305) on carousel (304), every second pivot (305) respectively with one rotating vane (302) rotate and be connected, the through-hole has been seted up at rotating vane (302) middle part, spacer pin (306) one end with the motor box links to each other, and the other end passes the through-hole, just spacer pin (306) can be in the through-hole internal movement.

8. A pipe welding auxiliary device according to claim 7, wherein the rotary blade (302) has opposite first and second ends, the first end being rotatably connected to a corresponding second shaft (305), the second end being circular-arc-shaped, and the second ends of the plurality of rotary blades (302) being located on the same circumference.

9. The pipe welding auxiliary device according to claim 8, wherein the rotary blade (302) comprises a first clip (3021) and a second clip (3022), the wind shield (303) being made of an elastic material and being clamped between the first clip (3021) and the second clip (3022);

and the wind shield (303) is in a disc shape, and the track of the outer edge of the wind shield (303) coincides with the track of the second ends of the plurality of rotating blades (302).

10. The auxiliary pipeline welding equipment according to claim 6, wherein three supporting wheels (4) are respectively connected to the outer side wall of the motor box (301) and the outer side wall of the driving device (2) along the circumferential direction;

the supporting wheel (4) is connected with the motor box (301) and the driving device (2) through a telescopic rod (401) respectively, and a damping spring (402) is arranged in the telescopic rod (401) and used for enabling the supporting wheel (4) to radially stretch and retract along the flexible soft connecting piece (1).