CN118664057A - Metal product butt welding device - Google Patents

Abstract

The present invention relates to the technical field of metal welding, and specifically to a butt welding device for metal products, comprising a base plate and a longitudinal movable rod installed thereon, a positioning base being installed at one end of a transverse rotating shaft at the top end of the longitudinal movable rod, a synchronous tightening mechanism being installed in the positioning base for fixing the metal product, a directional flipping mechanism moving synchronously with the longitudinal movable rod, two sides of the connecting mechanism being connected to the transverse rotating shaft 2 to maintain smooth transmission of the directional flipping mechanism, a constant distance welding mechanism abutting against the surface of the metal product, and a working end of the constant distance welding mechanism being dynamically adjusted as the metal product rotates; the device has the characteristics of wide adaptability, multiple clamping types, stable welding process and constant welding distance, and can realize welding work on a variety of similar metal products, not only running smoothly when adjusting the welding position, but also being able to automatically adjust the position of the working end of the welding head according to the changes in the weld during the welding process, thereby effectively ensuring the welding accuracy.

Description

Metal product butt welding device

Technical Field

The invention belongs to the technical field of metal welding, and in particular relates to a butt welding device for metal products.

Background Art

The metal products industry includes the manufacturing of structural metal products, metal tools, containers and metal packaging containers, stainless steel and similar daily metals, etc. With the progress of society and the development of science and technology, metal products are increasingly used in industry, agriculture and all areas of people's lives, creating more and more value for society.

A butt welding device is required for connecting two metal products. When the current butt welding device is used, the metal products are placed on the mounting seats respectively, and the metal products are fixed by adjusting multiple tightening bolts. The relative positions of the metal products are changed by using the set driving parts, and the metal pipes are welded by friction welding. However, during the welding process, it is only suitable for butt welding of round pipes. There is a problem of a single welding type. At the same time, it is difficult to effectively control the distance between the weld of metal products such as cubes and the welding working end, resulting in uneven quality of the welded products, affecting the subsequent use of the metal products.

Summary of the invention

The purpose of the embodiments of the present invention is to provide a metal product butt welding device, aiming to solve the problems existing in the above-mentioned background technology.

The embodiment of the present invention is implemented as follows: a metal product butt welding device includes a base plate and further includes:

Longitudinal movable rods, which are arranged in pairs on the bottom plate, and the top ends of the longitudinal movable rods on both sides are rotatably mounted with a transverse rotating shaft 1;

A positioning base, the positioning base is installed at one end opposite to the two lateral rotating shafts, and a groove is provided inside the positioning base to facilitate the placement of metal products of different sizes;

A synchronous tightening mechanism, which is installed in the positioning base to fix two metal products placed in the positioning base;

A directional flip mechanism, wherein the directional flip mechanism is slidably arranged on the bottom plate, the bottom end of the directional flip mechanism is rotatably connected to the longitudinal movable rod, the directional flip mechanism moves synchronously with the longitudinal movable rod, the top end of the directional flip mechanism is also fixedly connected to the transverse rotating shaft 1, and when the directional flip mechanism is working, the transverse rotating shaft 1, the positioning base and the metal product are driven to rotate synchronously;

A connection mechanism, the connection mechanism is arranged at the bottom end of the bottom plate, and the two sides of the connection mechanism are connected to the second transverse rotating shaft, so as to maintain the smooth transmission of the directional flip mechanism during the movement of the longitudinal movable rod;

A constant distance welding mechanism, wherein the constant distance welding mechanism is fixedly mounted on the side of the bottom plate, wherein the working end of the constant distance welding mechanism abuts against the surface of the metal product, and the working end of the constant distance welding mechanism is dynamically adjusted as the metal product rotates, so as to ensure the quality of welding;

Among them, a reverse drive mechanism is also installed on the base plate and the longitudinal movable rod. The driving ends on both sides of the reverse drive mechanism are respectively connected to the independently arranged longitudinal movable rods, which are used to control the longitudinal movable rods on both sides to move in opposite directions along the base plate, thereby adjusting the relative distance between the two sections of metal products.

Preferably, the synchronous pressing mechanism comprises a longitudinal rotating shaft, a cross frame, a driving gear plate, a movable gear plate, a spiral bar, a pressing rod and a limiting groove;

The longitudinal rotating shaft is rotatably mounted in the positioning base, and a cross-type shifting frame is mounted on the top of the longitudinal rotating shaft for shifting the longitudinal rotating shaft to move;

A driving toothed disc is installed at the bottom end of the longitudinal rotating shaft, and a movable toothed disc is arranged inside the positioning base to rotate along the axial direction of the transverse rotating shaft, and a plurality of teeth meshing with the driving toothed disc are arranged at the side edge position of the movable toothed disc, and a spiral strip is arranged on the movable toothed disc, so that the longitudinal rotating shaft, the driving toothed disc, the movable toothed disc and the spiral strip can be driven to rotate by rotating the cross-type rack;

A plurality of clamping rods are evenly arranged inside the positioning base, and the clamping rods are slidably connected to the limiting grooves on the positioning base. The sides of the clamping rods are also provided with grooves that cooperate with the spiral strips, which are used to pull the clamping rods to slide along the limiting grooves during the rotation of the movable toothed disc and the spiral strips;

The working end of the clamping rod is provided with an arc groove, and a protective layer is bonded in the arc groove to avoid damaging the surface layer of the metal product during clamping.

Preferably, the reverse drive mechanism comprises a fixed plate, a bidirectional lead screw, a horizontal guide groove and a cross frame;

The fixing plate is fixedly mounted on the upper surface of the bottom plate, a bidirectional lead screw is rotatably mounted on the surface of the fixing plate, and both ends of the bidirectional lead screw are respectively connected to the longitudinal movable rods on both sides;

The bidirectional lead screw is driven by a second independently arranged cross-shift frame, and when the second cross-shift frame is rotated, the longitudinal movable rods on both sides are pushed to slide in opposite directions along the horizontal guide grooves arranged on the bottom plate.

Preferably, a limiting block is also installed on the longitudinal movable rod, and the limiting block is slidably connected to a horizontal limiting groove arranged inside the bottom plate, so as to prevent the longitudinal movable rod from falling and improve the stability of the movement.

Preferably, the directional flipping mechanism comprises a second transverse rotating shaft, a stepped shaft, a pulley, a synchronous belt, a driving motor and a T-shaped inclined tie rod;

The second transverse rotating shaft is rotatably mounted on the bottom end of the longitudinal movable rod, and the stepped shaft is fixedly mounted on the end of the first transverse rotating shaft. Pulleys are mounted on both the second transverse rotating shaft and the stepped shaft, and the pulleys on the second transverse rotating shaft and the stepped shaft are connected by a synchronous belt, and a guide groove for the synchronous belt to move is provided on the bottom plate;

The second transverse rotating shaft is driven by an independently arranged driving motor, a T-shaped inclined tie rod is installed on the top end of the driving motor, and the T-shaped inclined tie rod is also slidably connected to the bottom end of the bottom plate.

Preferably, the connection mechanism comprises a limiting ring, a support, a limiting sleeve and a horizontal slot;

The limiting ring is installed on the second transverse rotating shaft, and the limiting ring is rotatably connected with the longitudinal movable rod;

The support is installed at the middle of the bottom end of the base plate, and a limit sleeve is rotatably arranged inside the support. The limit sleeve is slidably connected with horizontal slots opened on the two transverse rotating shafts at both ends.

Preferably, the constant distance welding mechanism comprises an L-rod, a sleeve, a feeler rod, a connecting rod, a welding head and a connecting piece;

The L-rod is fixedly mounted on the side of the bottom plate, and sleeves are arranged in pairs on one side of the L-rod. A contact rod is elastically inserted on the sleeve, and the contact rod abuts against the surface of the metal product;

Wherein, a welding head is arranged between the two side contact rods, and the contact rods are connected to the welding head through a connecting rod;

A connecting piece is installed inside the L-rod, one end of the connecting piece is connected to a welding head, and the other end of the connecting piece is connected to a welding device.

A metal product butt welding device provided by an embodiment of the present invention has the characteristics of wide adaptability, multiple clamping types, stable welding process and constant welding distance. It can realize welding work on multiple similar metal products, and does not need to manually clamp the metal products one by one, which can shorten the fixing time. Not only does it run smoothly when adjusting the welding position, but the position of the working end of the welding head can be automatically adjusted according to the changes in the weld during the welding process, thereby effectively ensuring the welding accuracy.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a three-dimensional structural diagram of a metal product butt welding device provided by an embodiment of the present invention;

FIG2 is a cross-sectional view of a positioning base in a metal product butt welding device provided by an embodiment of the present invention;

FIG3 is a partial three-dimensional structural diagram of a synchronous tightening mechanism in a metal product butt welding device provided by an embodiment of the present invention;

FIG4 is a partial enlarged view of point A in FIG1 ;

FIG5 is a partial enlarged view of point B in FIG1;

FIG6 is a three-dimensional structural diagram of a constant distance welding mechanism in a metal product butt welding device provided by an embodiment of the present invention;

In the attached drawings: 1-bottom plate; 2-longitudinal movable rod; 3-transverse rotating shaft 1; 4-positioning base; 5-groove; 6-longitudinal rotating shaft; 7-cross-shifting frame 1; 8-driving gear plate; 9-movable gear plate; 10-spiral strip; 11-tightening rod; 12-limiting groove; 13-fixing plate; 14-bidirectional lead screw; 15-horizontal guide groove; 16-cross-shifting frame 2; 17-limiting block; 18-horizontal limiting groove; 19-transverse rotating shaft 2; 20-step shaft; 21- Pulley; 22-synchronous belt; 23-guide groove; 24-driving motor; 25-T-type inclined rod; 26-limiting ring; 27-support; 28-limiting sleeve; 29-horizontal slot; 30-L rod; 31-sleeve; 32-touch rod; 33-connecting rod; 34-welding head; 35-connecting piece; 100-synchronous tightening mechanism; 200-directional flipping mechanism; 300-connecting mechanism; 400-constant distance welding mechanism; 500-reverse driving mechanism.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

As shown in Figures 1 to 6, a structural diagram of a metal product butt welding device provided by an embodiment of the present invention includes a base plate 1, a longitudinal movable rod 2, a positioning base 4, a synchronous pressing mechanism 100, a directional flipping mechanism 200, a connection mechanism 300 and a constant distance welding mechanism 400, wherein the longitudinal movable rods 2 are arranged in pairs on the base plate 1, and the top ends of the longitudinal movable rods 2 on both sides are rotatably installed with a transverse rotating shaft 3; the positioning base 4 is installed at the opposite end of the transverse rotating shaft 3 on both sides, and a groove 5 is provided inside the positioning base 4 to facilitate the placement of metal products of different sizes; the synchronous pressing mechanism 100 is installed in the positioning base 4 to fix two metal products placed in the positioning base 4; the directional flipping mechanism 200 is slidably arranged on the base plate 1, the bottom end of the directional flipping mechanism 200 is rotatably connected to the longitudinal movable rod 2, the directional flipping mechanism 200 moves synchronously with the longitudinal movable rod 2, and the top of the directional flipping mechanism 200 is also connected to the transverse rotating shaft 3. The directional turning mechanism 200 is fixedly connected to the lateral rotating shaft 13, and drives the lateral rotating shaft 13, the positioning base 4 and the metal product to rotate synchronously when the directional turning mechanism 200 is working; the connecting mechanism 300 is arranged at the bottom end of the base plate 1, and the two sides of the connecting mechanism 300 are connected to the lateral rotating shaft 19, so as to maintain the smooth transmission of the directional turning mechanism 200 during the movement of the longitudinal movable rod 2; the constant distance welding mechanism 400 is fixedly installed on the side of the base plate 1, and the working end of the constant distance welding mechanism 400 abuts against the surface of the metal product, and the working end of the constant distance welding mechanism 400 is dynamically adjusted with the rotation of the metal product, so as to ensure the quality of welding; wherein, a reverse driving mechanism 500 is also installed on the base plate 1 and the longitudinal movable rod 2, and the driving ends on both sides of the reverse driving mechanism 500 are respectively connected to the independently arranged longitudinal movable rods 2, which are used to control the longitudinal movable rods 2 on both sides to move in opposite directions along the base plate 1, thereby adjusting the relative distance between the two sections of the metal product.

In one example of the present invention, the fixing of two sections of metal products is achieved in advance by means of a synchronous clamping mechanism 100, the distance between the two sections of metal products is adjusted by means of a reverse driving mechanism 500, and the smooth transmission of the directional flipping mechanism 200 is maintained by means of a connecting mechanism 300. During the process of welding metal products by means of the directional flipping mechanism 200 in combination with the constant distance welding mechanism 400, the welding working position can be adjusted throughout the entire process.

The device provides a metal product butt welding device, which has the characteristics of wide adaptability, multiple clamping types, stable welding process and constant welding distance. It can realize the welding of multiple similar metal products. Not only does it run smoothly when adjusting the welding position, but the position of the working end of the welding head 34 can be automatically adjusted according to the changes in the weld during the welding process, thereby effectively ensuring the welding accuracy.

As shown in FIG. 1 , FIG. 2 and FIG. 3 , as a preferred embodiment of the present invention, the synchronous pressing mechanism 100 includes a longitudinal shaft 6, a cross frame 7, a driving gear 8, a movable gear 9, a spiral bar 10, a pressing rod 11 and a limiting groove 12;

The longitudinal rotating shaft 6 is rotatably mounted in the positioning base 4, and a cross-shaped shifting frame 7 is mounted on the top of the longitudinal rotating shaft 6 for shifting the longitudinal rotating shaft 6 to move;

A driving toothed disc 8 is installed at the bottom end of the longitudinal rotating shaft 6, and a movable toothed disc 9 is arranged inside the positioning base 4 to rotate along the axial direction of the transverse rotating shaft 3. A plurality of teeth meshing with the driving toothed disc 8 are arranged at the side edge of the movable toothed disc 9, and a spiral strip 10 is arranged on the movable toothed disc 9, so that the longitudinal rotating shaft 6, the driving toothed disc 8, the movable toothed disc 9 and the spiral strip 10 can be driven to rotate by rotating the cross-pickup frame 7;

A plurality of clamping rods 11 are evenly arranged inside the positioning base 4, and the clamping rods 11 are slidably connected to the limiting grooves 12 on the positioning base 4. The side of the clamping rods 11 is also provided with grooves that cooperate with the spiral bars 10, which are used to pull the clamping rods 11 to slide along the limiting grooves 12 during the rotation of the movable toothed disc 9 and the spiral bars 10.

In one embodiment of the present invention, the working end of the clamping rod 11 is provided with an arc groove, and a protective layer is bonded in the arc groove. The protective layer is made of rubber material to avoid damaging the surface of the metal product during clamping.

In addition, a chamber for driving the gear plate 8 and the movement of the teeth is provided in the positioning base 4 of the device, so that when the metal product is placed between adjacent clamping rods 11, the longitudinal rotating shaft 6 and the driving gear plate 8 are driven to rotate by rotating the cross-shift frame 7. Since the driving gear plate 8 is engaged with the teeth on the side of the movable gear plate 9, the movable gear plate 9 and the spiral bar 10 are driven to rotate. The spiral bar 10 pulls the clamping rod 11 to slide along the groove set on the limiting groove 12. In order to improve the adaptability of the device, the number of the clamping rods 11 arranged can be adjusted as needed.

As shown in FIG. 1 , FIG. 4 and FIG. 5 , as another preferred embodiment of the present invention, the reverse drive mechanism 500 includes a fixed plate 13, a bidirectional lead screw 14, a horizontal guide groove 15 and a cross frame 16;

The fixing plate 13 is fixedly mounted on the upper surface of the bottom plate 1, and a bidirectional lead screw 14 is rotatably mounted on the surface of the fixing plate 13, and both ends of the bidirectional lead screw 14 are respectively connected to the longitudinal movable rods 2 on both sides;

The bidirectional lead screw 14 is driven by an independently arranged cross frame 2 16 , and when the cross frame 2 16 is rotated, the longitudinal movable rods 2 on both sides are pushed to slide in opposite directions along the horizontal guide grooves 15 provided on the bottom plate 1 .

In one embodiment of the present invention, a limit block 17 is further installed on the longitudinal movable rod 2, and the limit block 17 is slidably connected to a horizontal limit groove 18 provided inside the bottom plate 1, so as to prevent the longitudinal movable rod 2 from falling and improve the stability of the movement;

When the cross-shift frame 2 16 is rotated, the cross-shift frame 2 16 drives the bidirectional screw 14 to rotate along the fixed plate 13. The bidirectional screw 14 also pushes the longitudinal movable rods 2 on both sides to move in opposite directions along the horizontal guide groove 15. The transverse rotating shaft 1 3, the positioning base 4, the synchronous clamping mechanism 100 and the metal product move synchronously.

As shown in FIG. 1 , FIG. 4 and FIG. 5 , as another preferred embodiment of the present invention, the directional flipping mechanism 200 includes a transverse rotating shaft 19 , a stepped shaft 20 , a pulley 21 , a synchronous belt 22 , a driving motor 24 and a T-shaped inclined rod 25 ;

The second transverse rotating shaft 19 is rotatably mounted on the bottom end of the longitudinal movable rod 2, and the stepped shaft 20 is fixedly mounted on the end of the first transverse rotating shaft 3. The second transverse rotating shaft 19 and the stepped shaft 20 are both equipped with pulleys 21, and the pulleys 21 on the second transverse rotating shaft 19 and the stepped shaft 20 are connected by a synchronous belt 22, and a guide groove 23 for the synchronous belt 22 to move is provided on the bottom plate 1;

The second transverse rotating shaft 19 is driven by an independently arranged driving motor 24 , and a T-shaped inclined tie rod 25 is installed on the top end of the driving motor 24 . The T-shaped inclined tie rod 25 is also slidably connected to the bottom end of the bottom plate 1 .

In one example of the present invention, the driving motor 24 drives the transverse rotating shaft 19 on one side to rotate when working, and the transverse rotating shaft 19 also drives the transverse rotating shaft 19 on the other side to rotate synchronously through the connecting mechanism 300. At the same time, the transverse rotating shaft 19 drives the stepped shaft 20 and the pulley 21 to move synchronously during the rotation process, thereby making the stepped shafts 20 and the transverse rotating shaft 13 on both sides rotate at the same frequency.

As shown in FIG. 1 , FIG. 4 and FIG. 5 , as another preferred embodiment of the present invention, the connection mechanism 300 includes a limiting ring 26 , a support 27 , a limiting sleeve 28 and a horizontal slot 29 ;

The limiting ring 26 is installed on the second transverse rotating shaft 19, and the limiting ring 26 is rotatably connected with the longitudinal movable rod 2;

The support 27 is installed at the middle of the bottom end of the base plate 1. A limit sleeve 28 is rotatably arranged in the support 27. The limit sleeve 28 is slidably connected to the horizontal slots 29 opened on the horizontal rotating shafts 19 at both ends.

In one example of the present invention, when the longitudinal movable rod 2 moves in opposite directions along the horizontal guide groove 15, the transverse rotating shaft 13 and the stepped shaft 20 move accordingly, and the transverse rotating shaft 19 on the corresponding side moves synchronously through the set limit ring 26, and the transverse rotating shaft 19 on both sides slide along the limit sleeve 28, thereby ensuring that the pulley 21 and the synchronous belt 22 move synchronously along the guide groove 23. During this process, the drive motor 24 and the T-shaped inclined rod 25 slide along the bottom end of the base plate 1 to ensure that the transverse rotating shaft 19 can maintain smooth transmission during horizontal movement.

As shown in FIG. 1 and FIG. 6 , as another preferred embodiment of the present invention, the constant distance welding mechanism 400 includes an L rod 30 , a sleeve 31 , a feeler rod 32 , a connecting rod 33 , a welding head 34 and a connecting member 35 ;

The L-rod 30 is fixedly mounted on the side of the bottom plate 1, and a pair of sleeves 31 are arranged on one side of the L-rod 30. A contact rod 32 is elastically inserted into the sleeve 31, and the contact rod 32 abuts against the surface of the metal product.

A welding head 34 is provided between the two side contact rods 32, and the contact rods 32 are connected to the welding head 34 through a connecting rod 33;

A connecting piece 35 is installed inside the L-bar 30 , one end of the connecting piece 35 is connected to the welding head 34 , and the other end of the connecting piece 35 is connected to a welding device.

In one example of the present invention, the metal product pushes the feeler rod 32 to slide along the sleeve 31 during the rotation process after docking, and the feeler rod 32 also drives the welding head 34 to move synchronously through the arranged connecting rod 33, and when the connecting member 35 is connected to an external welding device, the arranged welding head 34 realizes the welding work of the metal product.

In summary, the metal product is placed between adjacent clamping rods 11, and the longitudinal rotating shaft 6 and the driving gear plate 8 are driven to rotate by rotating the cross-pickup frame 17. Since the driving gear plate 8 is engaged with the teeth on the side of the movable gear plate 9, the movable gear plate 9 and the spiral bar 10 are driven to rotate. The spiral bar 10 pulls the clamping rod 11 to slide along the groove set on the limiting groove 12, so that the metal product is fixed by the clamping rod 11. When the cross-pickup frame 2 16 is rotated, the bidirectional lead screw 14 is driven to rotate along the fixed plate 13. The bidirectional lead screw 14 also pushes the longitudinal movable rods 2 on both sides to move in opposite directions along the horizontal guide groove 15. The top end of the longitudinal movable rod 2 pulls the transverse rotating shaft 13 and the stepped shaft 20 to move, and the bottom end of the longitudinal movable rod 2 pulls the transverse rotating shaft 13 through the limiting ring 26. The lateral rotating shaft 19 moves along the limiting sleeve 28. When the driving motor 24 drives the lateral rotating shaft 19 on one side to rotate, it also drives the lateral rotating shaft 19 on the other side to rotate through the limiting sleeve 28. The lateral rotating shafts 19 on both sides can drive the pulley 21, the stepped shaft 20, the lateral rotating shaft 1 3, the positioning base 4 and the metal product to rotate in sequence through the synchronous belt 22. At the same time, the T-shaped inclined rod 25 is connected to the external welding equipment, and the welding head 34 welds the welds of adjacent metal products. During rotational welding, the metal product pushes the feeler rod 32 to slide along the sleeve 31, and the elastic part inside the sleeve 31 is deformed by force. The feeler rod 32 drives the welding head 34 to move synchronously through the connecting rod 33, thereby keeping the distance between the welding head 34 and the weld of the metal product constant in the rotating state. The device has the characteristics of wide adaptability, multiple clamping types, stable welding process and constant welding distance, and can realize welding work on a variety of similar metal products. Not only does it run smoothly when adjusting the welding position, but the position of the working end of the welding head 34 can be automatically adjusted according to the changes in the weld during the welding process, thereby effectively ensuring the welding accuracy.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims (7)

1. A butt welding device for metal products, comprising a base plate, characterized in that it also includes: Longitudinal movable rods, which are arranged in pairs on the bottom plate, and the top ends of the longitudinal movable rods on both sides are rotatably mounted with a transverse rotating shaft 1; A positioning base, the positioning base is installed at one end opposite to the two lateral rotating shafts, and a groove is provided inside the positioning base to facilitate the placement of metal products of different sizes; A synchronous tightening mechanism, which is installed in the positioning base to fix two metal products placed in the positioning base; A directional flip mechanism, wherein the directional flip mechanism is slidably arranged on the bottom plate, the bottom end of the directional flip mechanism is rotatably connected to the longitudinal movable rod, the directional flip mechanism moves synchronously with the longitudinal movable rod, the top end of the directional flip mechanism is also fixedly connected to the transverse rotating shaft 1, and when the directional flip mechanism is working, the transverse rotating shaft 1, the positioning base and the metal product are driven to rotate synchronously; A connection mechanism, the connection mechanism is arranged at the bottom end of the bottom plate, and the two sides of the connection mechanism are connected to the second transverse rotating shaft, so as to maintain the smooth transmission of the directional flip mechanism during the movement of the longitudinal movable rod; A constant distance welding mechanism, wherein the constant distance welding mechanism is fixedly mounted on the side of the bottom plate, wherein the working end of the constant distance welding mechanism abuts against the surface of the metal product, and the working end of the constant distance welding mechanism is dynamically adjusted as the metal product rotates, so as to ensure the quality of welding; Among them, a reverse driving mechanism is also installed on the base plate and the longitudinal movable rod. The driving ends on both sides of the reverse driving mechanism are respectively connected to the independently arranged longitudinal movable rods, which are used to control the longitudinal movable rods on both sides to move in opposite directions along the base plate, thereby adjusting the relative distance between the two sections of metal products. 2. A metal product butt welding device according to claim 1, characterized in that the synchronous clamping mechanism comprises a longitudinal rotating shaft, a cross frame, a driving gear plate, a movable gear plate, a spiral bar, a clamping rod and a limiting groove; The longitudinal rotating shaft is rotatably mounted in the positioning base, and a cross-type shifting frame is mounted on the top of the longitudinal rotating shaft for shifting the longitudinal rotating shaft to move; A driving toothed disc is installed at the bottom end of the longitudinal rotating shaft, and a movable toothed disc is arranged inside the positioning base to rotate along the axial direction of the transverse rotating shaft, and a plurality of teeth meshing with the driving toothed disc are arranged at the side edge position of the movable toothed disc, and a spiral strip is arranged on the movable toothed disc, so that the longitudinal rotating shaft, the driving toothed disc, the movable toothed disc and the spiral strip can be driven to rotate by rotating the cross-type rack; A plurality of clamping rods are evenly arranged inside the positioning base, and the clamping rods are slidably connected to the limiting grooves on the positioning base. The sides of the clamping rods are also provided with grooves that cooperate with the spiral strips, which are used to pull the clamping rods to slide along the limiting grooves during the rotation of the movable toothed disc and the spiral strips; The working end of the clamping rod is provided with an arc groove, and a protective layer is bonded in the arc groove to avoid damaging the surface layer of the metal product during clamping. 3. A metal product butt welding device according to claim 1, characterized in that the reverse drive mechanism comprises a fixed plate, a bidirectional lead screw, a horizontal guide groove and a cross frame; The fixing plate is fixedly mounted on the upper surface of the bottom plate, a bidirectional lead screw is rotatably mounted on the surface of the fixing plate, and both ends of the bidirectional lead screw are respectively connected to the longitudinal movable rods on both sides; The bidirectional lead screw is driven by a second independently arranged cross-shift frame, and when the second cross-shift frame is rotated, the longitudinal movable rods on both sides are pushed to slide in opposite directions along the horizontal guide grooves arranged on the bottom plate. 4. A metal product butt welding device according to claim 3, characterized in that a limit block is also installed on the longitudinal movable rod, and the limit block is slidably connected to a horizontal limit groove arranged inside the bottom plate, so as to prevent the longitudinal movable rod from falling and improve the stability of the movement. 5. A metal product butt welding device according to claim 1, characterized in that the directional flipping mechanism comprises a second transverse rotating shaft, a stepped shaft, a pulley, a synchronous belt, a driving motor and a T-shaped inclined tie rod; The second transverse rotating shaft is rotatably mounted on the bottom end of the longitudinal movable rod, and the stepped shaft is fixedly mounted on the end of the first transverse rotating shaft. Pulleys are mounted on both the second transverse rotating shaft and the stepped shaft, and the pulleys on the second transverse rotating shaft and the stepped shaft are connected by a synchronous belt, and a guide groove for the synchronous belt to move is provided on the bottom plate; The second transverse rotating shaft is driven by an independently arranged driving motor, a T-shaped inclined tie rod is installed on the top end of the driving motor, and the T-shaped inclined tie rod is also slidably connected to the bottom end of the bottom plate. 6. A metal product butt welding device according to claim 5, characterized in that the connection mechanism comprises a limit ring, a support, a limit sleeve and a horizontal slot; The limiting ring is installed on the second transverse rotating shaft, and the limiting ring is rotatably connected with the longitudinal movable rod; The support is installed at the middle of the bottom end of the base plate, and a limit sleeve is rotatably arranged inside the support. The limit sleeve is slidably connected with horizontal slots opened on the two transverse rotating shafts at both ends. 7. A metal product butt welding device according to claim 1, characterized in that the constant distance welding mechanism comprises an L rod, a sleeve, a feeler rod, a connecting rod, a welding head and a connecting piece; The L-rod is fixedly mounted on the side of the bottom plate, and sleeves are arranged in pairs on one side of the L-rod. A contact rod is elastically inserted on the sleeve, and the contact rod abuts against the surface of the metal product; Wherein, a welding head is arranged between the two side contact rods, and the contact rods are connected to the welding head through a connecting rod; A connecting piece is installed inside the L-rod, one end of the connecting piece is connected to a welding head, and the other end of the connecting piece is connected to a welding device.