WO2022252336A1

WO2022252336A1 - Automatic cylindrical butt welding apparatus and welding method

Info

Publication number: WO2022252336A1
Application number: PCT/CN2021/104483
Authority: WO
Inventors: 刘敏; 彭明花; 刘俊
Original assignee: 南京昱晟机器人科技有限公司
Priority date: 2021-06-02
Filing date: 2021-07-05
Publication date: 2022-12-08
Also published as: CN113369758A

Abstract

The present invention relates to an automatic cylindrical butt welding apparatus and a welding method. It is only necessary to manually place a welding workpiece on a drive shaft and control, by means of a belt pulley, the circumferential rotation of the welding workpiece so as to enable the position of a welding seam to be adjustable. An upper limiting block of the transmission shaft can control the welding seam distance of the welding workpiece, thus ensuring that welding seam spacing can be controlled. During welding, vertical and horizontal linear movement by a welding head can be controlled by means of a combined cam and connecting rod structure; manual and electrical manipulations are combined, operation is simple, and the working efficiency is effectively improved. During movement, a first tension spring and a second tension spring provide a preset tightening force to the welding head to ensure the stable movement of the welding head. In addition, the periphery of a base is provided with a protective cover, so that it can be observed at any time during the welding process whether the direction of the welding head is correct without harming the eyes; and if there is an error, the position of the welding head can be adjusted immediately by means of a rotary knob.

Description

An automatic cylindrical butt welding device and welding method

technical field

The invention relates to the field of welding equipment, in particular to an automatic cylindrical butt welding device and a welding method.

Background technique

With the development of modern science and technology, welding has developed into an independent science, widely used in various fields of the national economy, and penetrated into household daily necessities. Butt welding refers to the method of placing the weldment between two clamping devices, aligning the end faces, and heating the contact point for welding.

In the traditional welding technology, manual welding is usually used. During the welding process, it is necessary to observe the position of the weld seam with the naked eye through the hand-held welding cap, while manually moving the welding tool. Not only is the work efficiency low, the machining accuracy of the welding workpiece is difficult to control, and , often accompanied by sparks, which poses a safety hazard.

technical problem

An automatic cylindrical butt welding device is provided, and a welding method based on the automatic cylindrical butt welding device is further provided, thereby solving the above-mentioned problems in the prior art.

technical solution

A fully automatic cylindrical butt welding device, including welding components, transmission components and protective cover three parts,

Wherein the welding assembly includes a transmission mechanism arranged on both sides of the connecting plate, and a welding head slidably connected to the end of the transmission mechanism,

transport assemblies, including conveyor assemblies mated in pairs on bases,

The protective cover is slidably arranged on the bottom edge of the base, and the monitoring surface on the protective cover is parallel to the welding head. The protective cover can be moved to any position of the machine base at will, so as to observe the welding position in different directions, and protect the welder while observing. The monitoring surface adopts the light control electric welding surface.

In a further embodiment, the transmission mechanism includes a vertical transmission mechanism, and a vertical transmission mechanism oppositely arranged on the other side of the connecting plate, and the connecting plate is sawed with a groove along the transverse direction, which is used to place the motor to facilitate the control of the first A cam turns. The transmission mechanism controls the moving direction of the welding head. The vertical transmission mechanism is manually controlled to independently control the welding depth. The groove is equipped with a motor to control the longitudinal transmission mechanism independently. ,Improve work efficiency.

In a further embodiment, the longitudinal transmission mechanism includes a transmission chain fixedly connected to the motor, the output shaft of the transmission chain is connected to a first cam, the first cam is arranged on the same axis as the transmission chain, and the first cam is arranged on the same axis as the transmission chain. The edge of a cam is connected with a first runner to form a cam mechanism, and the first runner is on the same axis as the center of the first cam, and the first runner is connected with a first connecting rod in rotation, and the first connecting rod One end is rotatably connected to a slider, and the other end is connected to the first rotating column to form a crank-slider mechanism. The slider moves with a predetermined stroke, and the other end is fixedly connected to the end of the first transmission rod. The motor automatically controls the rotation of the first cam to finally drive the welding head to move longitudinally. The contour curve of the first cam is designed according to the predetermined travel trajectory of the welding head. The first cam rotates one circle, and the welding head moves back and forth longitudinally, reciprocating in turn. The design of the first cam It can effectively control the moving stroke of the welding head to avoid the welding position deviation during the automatic movement.

In a further embodiment, the vertical transmission mechanism includes a second cam fixed at the other end of the connecting plate, the edge of the second cam is connected with a second wheel to form a cam mechanism, and the second wheel and the first The centers of the two cams are on the same axis, and the second rotating wheel is rotatably connected to the turning point of the second connecting rod. One end of the second connecting rod is rotatably connected to the second rotating column, and the other end is rotatably connected to the second slider. Fixed with the slide plate, the slide plate slides on the second transmission rod with a predetermined stroke, and the slide block and the slide plate move perpendicularly to each other. The vertical movement of the welding workpiece can be adjusted by manually rotating the knob, so that the welding depth can be self-controlled.

The law of motion of the first cam in the present invention is as follows: when the first cam rotation angle is 0° to 90°, the follower rises to the highest point at a constant speed; when the first cam rotation angle is 90° to 180°, the follower rises to the highest point When the first cam rotation angle is 180° to 270°, the follower drops to the lowest point at a constant speed; when the first cam rotation angle is 270° to 360°, the follower stops at the lowest position;

The law of motion of the second cam in the present invention is as follows: when the first cam rotation angle is 0° to 180°, the follower rises to the highest point at a constant velocity; when the first cam rotation angle is 180° to 360°, the follower descends at a constant velocity to the lowest point;

The process of stopping the rotation of the first cam is the welding process, and cooperates with the second cam to control the welding speed to ensure smooth welding.

Assume that the radius of the base circle of the cam is r ₀ , and the radius of the rotating cylinder is r _T. When the minimum curvature radius of the theoretical profile ρ _min >r _T , transitional cutting can be avoided. At this time, an allowable curvature radius [ρ _s ] is assumed

ρ ' _s,min = ρ _min - r _T ≥ [ ρ _s ]

Then [ ρ _s ]=3-5mm, and ρ _min is known at this time _, then the maximum value of the radius of the rotating column r _T ≤ρ _min -[ρ _s ] can be obtained.

In this way, the stroke of the welding head moving back and forth can be modified only by adjusting the radius of the rotating column, and the operation is simple and convenient.

In a further embodiment, a first extension spring is fixedly arranged at the center of the first rotating wheel and the slider, and one end of the first extension spring is connected to the first positioning block through a connecting rod. The first positioning block is fixed and vertically installed on one side of the connecting plate.

In a further embodiment, a second tension spring is fixedly connected to a second positioning block on the side of the sliding plate, and the second positioning block is fixed on the end of the first transmission rod and is perpendicular to the connecting plate. The tension spring gives a predetermined tension when the welding head moves, preventing the welding head from being unstable during the moving process, and the random shaking will affect the appearance of the weld seam.

In a further embodiment, the welding head includes a body, a conductive plate slidably connected to the first transmission rod, a protective piece connected to one end of the conductive plate, and a buckle fixedly connected to the other end. The buckle is movably connected with the body. The protective parts are made of insulating and heat-insulating materials to reduce the sparks generated by the welding head during welding and prevent splashing everywhere.

In a further embodiment, the conveying assembly includes a base fixed on the base, a transmission shaft symmetrically arranged on the base, and a limit block is arranged at one end of the drive shaft, and the limit block is fixed on the drive shaft with a predetermined distance superior. The transmission shaft is controlled by the belt pulley to drive the workpiece to be welded in the forward and reverse direction, and the welding position is controlled. The limit block can control the distance of the welding seam.

A welding method of an automatic cylindrical butt welding device, comprising the following steps:

S1. Manually place the workpieces to be welded on the drive shaft respectively, match the surface to be welded with the position of the limit block, and reserve the width of the weld to be welded between the welding surfaces;

S2. Start the motor that controls the transmission shaft, the transmission shaft rotates for 2-3 seconds, automatically corrects the horizontal position of the welding workpiece, adjusts the steering of the motor to adjust the forward and reverse of the welding workpiece;

S3. Manually adjust the rotary knob to control the second cam mechanism to drive the second link mechanism, thereby controlling the welding head to move up and down, and the welding head corresponds to the welding surface, and a predetermined distance is reserved;

S4. At this time, the welding head has no power supply, directly observe whether the welding position is correct, and whether the welding rod is aligned with the middle position of the welding seam;

S5. Manually adjust the rotary knob again to control the welding head to move down slowly to prepare for subsequent welding. At this time, the second cam rotates one circle, and the welding head moves vertically back and forth;

S6. First move the protective cover to the welding position, and then turn on the power of the motor. The motor rotates the belt to drive the first cam to rotate, the first runner moves according to the contour curve of the first cam, and the crank slider mechanism drives the slider to control the first cam. A transmission rod moves longitudinally, so reciprocating, the welding head automatically reciprocates longitudinally;

S7. During the welding process, observe whether the welding position is correct and whether the welding seam is complete from the protective cover at any time;

S8. If there is a problem with welding, adjust the rotary knob at any time to control the position of the welding rod;

S9. When the welding seam is completed, control the rotary knob to place the steering column at the highest point of the first cam. At this time, the welding rod is separated from the welding surface, stop welding, and disconnect the power supply;

S10, and so on, repeat the work of S2, S3, S4, S5, S6, S7, S8, S9, until the welding work is finished.

Beneficial effect

The invention relates to an automatic cylindrical butt welding device and a welding method. It only needs to manually place the welding workpiece on the transmission shaft, and the circumferential rotation of the welding workpiece is controlled by the belt pulley, so that the position of the welding seam can be adjusted, and the upper limit block of the transmission shaft can be controlled. The welding seam distance of the welding workpiece ensures the controllability of the welding seam spacing. During welding, the vertical and longitudinal linear movement of the welding head can be controlled by the combined structure of the cam and the connecting rod. The combination of manual and electric operation is simple and effectively improves the work efficiency. Efficiency, and at the same time stretch the spring to give the welding head a certain pre-tightening force during the moving process to ensure the smooth movement of the welding head. In addition, there is a protective cover around the machine base, which can ensure that the welding head can be observed at any time while not hurting the eyes during the welding process. If there is a mistake, the position of the welding head can be adjusted in time by turning the knob.

Description of drawings

Fig. 1 is the overall structure diagram of the present invention.

Fig. 2 is a structural schematic diagram of the longitudinal transmission mechanism in the present invention.

Fig. 3 is a structural schematic diagram of the vertical transmission mechanism in the present invention.

Fig. 4 is a schematic diagram of the structure and connection of the welding joint in the present invention.

Fig. 5 is a schematic structural diagram of the transmission assembly of the present invention.

The reference signs in the figure are: machine base 1, transmission mechanism 2, transmission assembly 3, welding head 4, protective cover 5, monitoring surface 6, second positioning block 201, first positioning block 202, connecting plate 203, first Tension spring 204, first transmission rod 205, slide block 206, chute 207, first connecting rod 208, first runner 209, first rotation column 210, first cam 211, transmission chain 212, second stretching Spring 213, second transmission rod 214, rotary knob 215, second cam 216, motor 217, slide plate 218, second runner 219, second rotating column 220, second connecting rod 221, base 301, limit block 302, Transmission shaft 303 , welding rod 401 , protective piece 402 , conductive block 403 , body 404 , buckle 405 .

Embodiments of the present invention

In the following description, numerous specific details are given in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without one or more of these details. In other examples, some technical features known in the art are not described in order to avoid confusion with the present invention.

The applicant believes that in the traditional welding technology, manual welding is usually used. During the welding process, it is necessary to observe the position of the weld seam with the naked eye through a hand-held welding cap, and at the same time manually move the welding tool. Not only is the work efficiency low, but the machining accuracy of the welded workpiece is difficult to control. During the welding process, sparks are often accompanied, which poses a safety hazard.

For this reason, the applicant has designed an automatic cylindrical butt welding device and welding method, only needing to manually place the welding workpiece on the transmission shaft 303, and the circumferential rotation of the welding workpiece is controlled by the belt pulley, so that the position of the welding seam can be adjusted, and the transmission shaft 303 The upper limit block 302 can control the welding seam distance of the welding workpiece, thereby ensuring the controllability of the welding seam spacing. During welding, the vertical and longitudinal linear direction movement of the welding head 4 can be controlled through the combined structure of the cam and the connecting rod. Manual and electric Combined, the operation is simple, and the work efficiency is effectively improved. In the process of moving, the stretching spring simultaneously gives the welding head 4 a certain pre-tightening force to ensure that the welding head 4 moves smoothly. In addition, the periphery of the machine base 1 is provided with a protective cover 5, which can While ensuring that the eyes are not hurt, it is possible to observe whether the direction of the welding head 4 is correct at any time. If there is a mistake, the position of the welding head 4 can be adjusted in time by the rotary knob 215.

As shown in Fig. 1 to Fig. 5, the present invention discloses an automatic cylindrical butt welding device and a welding method. Among them, a fully automatic cylindrical butt welding device includes three parts: a welding assembly 2 , a transmission assembly 3 and a protective cover 5 .

Wherein the welding assembly 2 includes the transmission mechanism 2 arranged on both sides of the connecting plate 203, and the welding head 4 slidably connected to the end of the transmission mechanism 2,

The transmission assembly 3 includes a pair of conveying assemblies fitted on the base 301,

The protective cover 5 is slidably arranged on the bottom edge of the machine base 1 , and the monitoring surface 6 on the protective cover 5 is parallel to the welding head 4 . The protective cover 5 adopts the roller chute 207 to half-enclose the machine base 1, and can move to any position of the machine base 1 at will during the welding process. For welding positions in different directions, if the position of the welding seam is wrong, or the welding seam is not beautiful, you can cut off the power at any time and readjust the transmission mechanism 2 to adjust the welding position. In order to ensure that the electric spark will not hurt the welder during observation, the protective The cover 5 adopts high-temperature-resistant and heat-insulating materials, which can also prevent electric sparks from splashing everywhere, and can collect welding waste, which is convenient for cleaning and handling.

The transmission mechanism 2 includes a vertical transmission mechanism 2, and a vertical transmission mechanism 2 oppositely arranged on the other side of the connecting plate 203. The connecting plate 203 has grooves cut along the transverse direction, and is used to place the motor 217 to facilitate the control of the first The cam 211 rotates. The transmission mechanism 2 controls the moving direction of the welding head 4, and the vertical transmission mechanism 2 adopts manual and can independently control the welding depth, and the groove is provided with a motor 217 to separately control the longitudinal transmission mechanism 2, and the electric longitudinal transmission mechanism 2 automatically moves the longitudinal movement of the welding head 4, Effectively ensure the weld seam is beautiful and labor-saving, and improve work efficiency.

The longitudinal transmission mechanism 2 includes a transmission chain 212 fixedly connected to the motor 217, the output shaft of the transmission chain 212 is connected to the first cam 211, the first cam 211 and the transmission chain 212 are arranged on the same axis, and the first cam 211 is arranged on the same axis as the transmission chain 212. The edge of a cam 211 is connected with a first wheel 209 to form a cam mechanism. The first wheel 209 is on the same axis as the center of the first cam 211. The first wheel 209 is rotatably connected with a first connecting rod 208. One end of the first connecting rod 208 is rotatably connected to the slider 206, and the other end is connected to the first rotating column 210 to form a crank slider 206 mechanism. The slider 206 moves with a predetermined stroke, and the other end is fixedly connected to the first transmission rod. At the end of 205, the motor 217 automatically controls the rotation of the first cam 211 to finally drive the welding head 4 to move longitudinally. The contour curve of the first cam 211 is designed according to the predetermined travel track of the welding head 4. The contour curve of the first cam 211 in the present invention is shown in the figure As shown in 2, when the first cam 211 turns to the highest point, the welding head 4 is at the outermost edge of the weld seam, the first cam 211 rotates the welding head 4 and starts to move forward until the first cam 211 turns to the next arc point, The welding head 4 starts to go back, so that the first cam 211 rotates one circle, and the welding head 4 can move back and forth longitudinally, reciprocating in turn. The design of the first cam 211 can effectively control the moving stroke of the welding head 4, avoiding the automatic movement. During the process, the welding position shifts.

Described vertical transmission mechanism 2 comprises the second cam 216 that is fixed on the other end of connecting plate 203, and the edge of described second cam 216 is connected with second rotating wheel 209 to form cam mechanism, and described second rotating wheel 209 and second The center of the cam 216 is on the same axis, the second rotating wheel 209 is rotatably connected to the turning point of the second connecting rod 208, one end of the second connecting rod 208 is rotatably connected to the second rotating post 220, and the other end is rotatably connected to The second sliding block 206 is fixed to the sliding plate 218, and the sliding plate 218 slides on the second transmission rod 214 with a predetermined stroke, and the sliding block 206 and the sliding plate 218 move perpendicularly to each other. The contour curve of the second cam 216 in the present invention is shown in Figure 2, the second cam 216 rotates to the highest point, the second connecting rod 208 drives the slide plate 218 to move the welding head 4 to the top, at this time the welding head 4 is welded in principle surface, twist the rotary knob 215, the welding head 4 starts to move downwards, and the welding can be carried out when it comes into contact with the welding surface. Since the cylindrical welding seam is an arc curve, during the welding process, it is enough to manually twist the rotary knob 215 slowly. The moving height of the welding head 4 corresponds to the height of the welding surface. When the welding is completed, control the rotary knob 215 to place the steering column at the highest point of the first cam 211. At this time, the welding rod 401 can be separated from the welding surface to stop welding. It is so simple and convenient. The vertical movement of the welding workpiece can be adjusted only by adjusting the rotary knob 215, so that the welding depth can also be self-controlled.

The center of the first rotating wheel 209 and the slider 206 is fixed with a first tension spring 204, and one end of the first tension spring 204 is connected to the first positioning block 202 through a connecting rod. The positioning block 202 is fixed and vertically installed on one side of the connecting plate 203 . The first tension spring 204 gives a certain tension in the longitudinal direction when the connecting rod moves, so as to finally control the welding head 4 to move smoothly in the longitudinal direction.

The side of the sliding plate 218 is connected with a second tension spring 213 and is fixedly connected with the second positioning block 201 , and the second positioning block 201 is fixed at the end of the first transmission rod 205 and is perpendicular to the connecting plate 203 . The second tension spring 213 provides a predetermined tension force when the welding head 4 moves vertically, so as to prevent the welding head 4 from being unstable during its movement and randomly shaking to affect the appearance of the weld seam.

The welding head 4 includes a body 404, a conductive plate slidably connected to the first transmission rod 205, a protective piece 402 connected to one end of the conductive plate, and a buckle 405 fixedly connected to the other end. Buckle 405 is movably connected with body 404 . The bayonet lock fixes the body 404 to prevent it from falling, and when replacing the welding rod 401, the body 404 can be removed for replacement and installation only by opening the buckle 405. Since a large number of electric sparks are generated during the welding process, the protective part 402 adopts The micro-nano heat shield and the protective part 402 block part of the welding rod sparks during welding, thereby reducing the sparks generated by the welding head 4 during welding and preventing splashing everywhere.

The conveying assembly includes a base 301, and transmission shafts 303 symmetrically arranged on the base 301, wherein two transmission shafts 303 are provided with limiting blocks 302 at opposite ends, and the limiting blocks 302 are fixed on the transmission shafts 303 at a predetermined distance. The limit block 302 is fixed at a predetermined position with a gap in the middle. According to the required weld distance, the welding surface of the welded workpiece corresponds to a suitable position on the limit block 302 to ensure smooth welding. The transmission shaft 303 is controlled by the pulley to rotate , so that the rotation of the welded part can be controlled smoothly, so that when a welding error is found, the welded workpiece can be driven to rotate forward and backward in the circumferential direction to control the welding position.

In addition, the motion law of the first cam 211 in the present invention is as follows: when the rotation angle of the first cam 211 is 0° to 90°, the follower rises to the highest point at a constant speed, and the first cam 211 moves toward the welding workpiece at a constant speed; When the rotation angle of the first cam 211 is 90° to 180°, the follower stops at the highest position, and the welding head 4 starts welding; when the rotation angle of the first cam 211 is 180° to 270°, the follower drops to the lowest point at a constant speed , the first cam 211 moves away from the welding workpiece at a constant speed; when the rotation angle of the first cam 211 is 270° to 360°, the follower stops at the lowest position, and the first cam 211 waits for the second cam 216 to empty back to the starting point;

The law of motion of the second cam 216 in the present invention is as follows: when the second cam 216 rotation angle is 0 ° to 180 °, the follower rises to the highest point at a constant speed, and the welding head 4 starts to move along the weld seam, and the second cam 216 rotation angle is From 180° to 360°, the follower drops to the lowest point at a constant speed, and the welding head 4 returns to the starting point;

The process of the first cam 211 stopping the rotation is a welding process, and cooperates with the second cam 216 to control the welding speed to ensure smooth welding.

In addition, assuming that the radius of the base circle of the cam is r ₀ , and the radius of the rotating cylinder is r _T , when the minimum curvature radius of the theoretical profile ρ _min >r _T , transitional cutting can be avoided. At this time, an allowable curvature radius [ρ _s ] is assumed which is

ρ ' _s,min = ρ _min - r _T ≥ [ ρ _s ]

Then [ρ _s ]=3-5mm, if ρ _min is known at this time _, the maximum value of the radius of the rotating column r _T ≤ρ _min -[ρ _s ] can be obtained.

In this way, the stroke of the welding head 4 moving back and forth can be modified only by adjusting the radius of the rotating column, and the operation is simple and convenient.

Based on the above-mentioned technical scheme, the specific working process of the welding method of a kind of automatic cylindrical butt welding device proposed by the present invention is as follows:

First, the workpieces to be welded are manually placed on the drive shaft 303 respectively, the faces to be welded correspond to the position of the limit block 302, the weld seam width to be welded is reserved between the welded faces, and the motor 217 to control the drive shaft 303 is started , make the transmission shaft 303 rotate for 2-3 seconds, automatically correct the horizontal position of the welding workpiece, adjust the rotation of the motor 217 to adjust the forward and reverse of the welding workpiece, manually adjust the rotary knob 215, and control the second cam 216 mechanism to drive the second connecting rod 208 mechanism , so as to control the welding head 4 to move up and down. Before welding, align the welding head 4 with the welding surface and keep a predetermined distance, and directly observe whether the welding position is correct and whether the welding rod 401 is aligned with the middle position of the weld seam. At this time, the welding head 4 The power supply is not connected, so after confirming that there is no problem, the rotary knob 215 can be manually adjusted again to control the welding head 4 to move down slowly to prepare for follow-up welding. Before turning on the power supply of the motor 217, at first the protective cover 5 is moved to the corresponding welding position, and then ready to start welding, the motor 217 rotates the belt and drives the first cam 211 to rotate, and the first runner 209 moves according to the contour curve of the first cam 211, The crank slider 206 mechanism drives the slider 206, thereby controlling the longitudinal movement of the first transmission rod 205, so reciprocating, the welding head 4 automatically reciprocates longitudinally, and the welding head 4 is connected to the power supply through the conductive block 403. At this time, it is only necessary to ensure that the welding head 4 is vertical To the position, you can weld smoothly. During the welding process, it is necessary to observe from the protective cover 5 at any time whether the welding position is correct and whether the weld is complete. If there is a problem in welding, adjust the rotary knob 215 at any time to control the position of the welding rod 401. After the weld is completed, adjust the rotary knob 215 again. The contour curve of the second cam 216 is designed, the second cam 216 rotates to the highest point, the second connecting rod 208 drives the slide plate 218 to move the welding head 4 to the top, when the welding rod 401 breaks away from the welding surface, the welding can be stopped. Turn on the power, and so on, and repeat the work in turn until the welding work is finished.

As stated above, while the invention has been shown and described with reference to certain preferred embodiments, this should not be construed as limiting the invention itself. Various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

An automatic cylindrical butt welding device, its features include:

The welding assembly includes a transmission mechanism arranged on both sides of the connecting plate, and a welding head fixed at the end of the transmission mechanism,

The transmission assembly includes a transmission assembly perpendicular to the transmission mechanism and fixedly installed on the machine base,

The protective cover is slidably arranged on the bottom edge of the base, and the outer surface of the protective cover is provided with a monitoring surface, and the monitoring surface is parallel to the welding head.
An automatic cylindrical butt welding device according to claim 1, characterized in that: the transmission mechanism includes a vertical transmission mechanism, and a longitudinal transmission mechanism oppositely arranged on the other side of the connecting plate, and the connecting plate is cut along the transverse direction. The saw has grooves.
An automatic cylindrical butt welding device according to claim 2, characterized in that: the longitudinal transmission mechanism includes a transmission chain fixedly connected to the motor, the output shaft of the transmission chain is connected to the first cam, and the first cam Set on the same axis as the transmission chain, the edge of the first cam is connected with a first wheel to form a cam mechanism, the first wheel is on the same axis as the center of the first cam, and the first wheel is connected in rotation There is a first connecting rod, one end of the first connecting rod is rotatably connected to a slider, and the other end is connected to the first rotating column to form a crank-slider mechanism, the slider moves with a predetermined stroke, and the other end is fixedly connected to the first transmission end of the rod.
An automatic cylindrical butt welding device according to claim 2, characterized in that: the vertical transmission mechanism includes a second cam fixed on the other end of the connecting plate, and a second wheel is connected to the edge of the second cam A cam mechanism is formed, the second rotating wheel is on the same axis as the second cam center, the second rotating wheel is rotatably connected to the turning point of the second connecting rod, and one end of the second connecting rod is connected to the second rotating column Rotationally connected, the other end of the second sliding block is fixed to the sliding plate, and the sliding plate slides on the second transmission rod with a predetermined stroke, and the sliding block and the sliding plate move perpendicularly to each other.
An automatic cylindrical butt welding device according to claim 3, characterized in that: a first tension spring is fixedly arranged at the center of the first rotating wheel and the slider, and one end of the first tension spring passes through The connecting rod is connected with the first positioning block, and the first positioning block is fixed and vertically installed on one side of the connecting plate.
An automatic cylindrical butt welding device according to claim 4, characterized in that: the side of the slide plate is connected with a second tension spring and is fixedly connected with a second positioning block, and the second positioning block is fixed on the first transmission The end of the rod is perpendicular to the connecting plate.
An automatic cylindrical butt welding device according to claim 1, wherein the welding head includes a conductive plate slidably connected to the first transmission rod, and a protective piece connected to one end of the conductive plate, and the other end The buckle is fixedly connected, and the buckle is movably connected with the body.
An automatic cylindrical butt welding device according to claim 1, characterized in that: the conveying assembly includes a base fixed on the machine base, a transmission shaft symmetrically arranged on the base, and a limit stop is set at one end of the transmission shaft block, and the limit block is fixed on the transmission shaft with a predetermined distance.
A welding method for an automatic cylindrical butt welding device according to any one of claims 1 to 8, characterized in that it comprises the following steps:

S1. Manually place the workpieces to be welded on the transmission shaft respectively, match the surface to be welded with the position of the limit block, and reserve the width of the weld to be welded between the welding surfaces;

S2. Start the motor that controls the transmission shaft, the transmission shaft rotates for 2-3 seconds, automatically corrects the horizontal position of the welding workpiece, adjusts the steering of the motor to adjust the forward and reverse of the welding workpiece;

S3. Manually adjust the rotary knob to match the welding head to the welding surface and keep a predetermined distance;

S4. At this time, the welding head has no power supply, directly observe whether the welding position is correct, and whether the welding rod is aligned with the middle position of the welding seam;

S5. Manually adjust the rotary knob again to control the welding head to move down slowly to prepare for subsequent welding;

S6. First move the protective cover to the welding position, turn on the power supply of the motor, and the motor rotates the belt to drive the crank slider mechanism to drive the slider, thereby controlling the longitudinal movement of the first transmission rod. In this way, the welding head automatically reciprocates longitudinally;

S7. During the welding process, observe from the protective cover whether the welding position is correct and whether the welding seam is complete;

S8. If there is a problem with welding, adjust the rotary knob to control the position of the welding rod;

S9. When the welding seam is completed, control the rotary knob to place the steering column at the highest point of the first cam. At this time, the welding rod is separated from the welding surface, stop welding, and disconnect the power supply;

S10, and so on, repeat the work of S2, S3, S4, S5, S6, S7, S8, S9, until the welding work is finished.