CN115283829A

CN115283829A - Laser butt welding equipment for steel strip

Info

Publication number: CN115283829A
Application number: CN202211058729.5A
Authority: CN
Inventors: 王建忠; 曾丽娜; 张用; 吴葛铭
Original assignee: Hunan Zhongnan Intelligent Laser Technology Co ltd
Current assignee: Hunan Zhongnan Intelligent Laser Technology Co ltd
Priority date: 2022-08-30
Filing date: 2022-08-30
Publication date: 2022-11-04

Abstract

The invention relates to a steel strip laser butt welding device which comprises a welding head moving platform, a butt welding tool, a laser and an electric control cabinet, wherein the welding head moving platform is arranged on the welding head moving platform; the welding head moving platform comprises a bottom mounting plate, a moving mechanism, a welding head mounting plate and a welding head, wherein the moving mechanism is arranged on the bottom mounting plate, the welding head mounting plate is arranged on the moving mechanism, the welding head is arranged on the welding head mounting plate, and the moving mechanism is used for driving the welding head to move; the butt welding tool comprises a workpiece positioning mechanism and a middle positioning mechanism, the two workpiece positioning mechanisms are used for fixing two steel belt workpieces respectively, the middle positioning mechanism comprises an end positioning block which can rotate in a vertical plane, the positioning block is rotatably arranged between the two workpiece positioning mechanisms, the laser is connected with a welding head through an optical fiber, and the electric control cabinet provides electric power for the laser. The laser butt welding equipment is used for butt joint continuous welding of steel strip workpieces, improves weld seam beauty through laser welding, reduces weld seam polishing amount, and improves weld seam toughness through annealing treatment of the weld seams.

Description

Laser butt welding equipment for steel strip

Technical Field

The invention belongs to the technical field of welding, and particularly relates to laser butt welding equipment for steel strips

Background

At present, the steel strip is mostly resistance flash butt welding to the welding that continues adopting equipment, and this kind of welded joint takes shape relatively poorly, need can use after polishing the work piece after the welding is accomplished, and welding strength and aesthetic property are relatively poor, consequently urgently need an equipment to solve above-mentioned problem, improve welding seam intensity, reduce the volume of polishing after welding. In recent years, laser welding technology is widely applied, the laser welding has high strength and attractive weld joint formation, polishing is hardly needed after welding, but part of materials are fragile in the weld joint of a laser welding head and are easy to break.

Therefore, there is a need to develop a laser butt welding apparatus for steel strips to solve the above problems in the prior art and effectively improve the welding efficiency.

The invention content is as follows:

the invention aims to provide laser butt welding equipment for steel strips, which is used for solving the problems in the prior art and effectively improving the welding work efficiency.

In order to achieve the purpose, the invention adopts the following technical scheme:

a steel strip laser butt welding device comprises a welding head moving platform, a butt welding tool, a laser and an electric control cabinet; the welding head moving platform comprises a bottom mounting plate, a moving mechanism, a welding head mounting plate and a welding head, wherein the moving mechanism is arranged on the bottom mounting plate, the welding head mounting plate is arranged on the moving mechanism, the welding head is arranged on the welding head mounting plate, and the moving mechanism is used for driving the welding head mounting plate to move in the horizontal direction or the vertical direction; the butt welding tool comprises a workpiece positioning mechanism and a middle positioning mechanism, the two workpiece positioning mechanisms are used for fixing two steel strip workpieces respectively, the middle positioning mechanism comprises an end positioning block which can rotate in a vertical plane, the end positioning block can be rotatably arranged between the two workpiece positioning mechanisms to position the abutted seams of the two steel strip workpieces, and a welding head is used for welding the abutted seams of the two steel strip workpieces; the laser instrument passes through the optical fiber connection soldered connection, and the automatically controlled cabinet provides electric power for the laser instrument.

On the basis of the scheme, in another improved scheme, the workpiece positioning mechanism comprises a tool bottom plate, a side positioning block and an upper pressing unit, the side positioning block and the upper pressing unit are arranged on the tool bottom plate, the side positioning block is used for positioning the side face of the steel strip workpiece, and the upper pressing unit is used for vertically pressing the steel strip workpiece on the tool bottom plate.

On the basis of above-mentioned scheme, in another modified scheme, on compress tightly the unit and include the cylinder mount pad, compress tightly the cylinder, on compress tightly the subassembly, guiding axle and uide bushing, cylinder mount pad fixed connection is on the frock bottom plate, it installs on the cylinder mount pad to compress tightly the cylinder, on compress tightly the subassembly and link to each other with the expansion end that compresses tightly the cylinder, the uide bushing is fixed at the cylinder mount pad, the guiding axle is fixed on last compressing tightly the subassembly, but the guiding axle sets up in the uide bushing with vertical removal, it is vertical near or keep away from the frock bottom plate to compress tightly the subassembly on driving during the expansion end vertical removal of cylinder to compress tightly.

On the basis of the scheme, in another improved scheme, the upper pressing assembly comprises a floating joint, a pressing plate and an upper pressing block, the top of the floating joint is fixed at the bottom of the movable end of the pressing cylinder, the bottom of the floating joint is connected with the pressing plate, the guide shaft is fixed on the upper surface of the pressing plate, and the upper pressing block is fixed on one side of the upper surface of the pressing plate; and when the movable end of the pressing cylinder vertically moves, the floating joint, the pressing plate and the upper pressing block are driven to vertically approach or keep away from the tool bottom plate.

On the basis of the scheme, in another improved scheme, the steel strip positioning fixture further comprises a pressing cushion block, the pressing cushion block is arranged on the upper surface of the fixture base plate, the side positioning block is arranged on one side of the pressing cushion block, the upper pressing block is arranged above the pressing cushion block, and a steel strip workpiece to be positioned is arranged between the pressing cushion block and the upper pressing block.

On the basis of the scheme, in another improved scheme, the two compression cushion blocks are arranged on two sides of the upper surface of the tool bottom plate, the two upper compression blocks and the two compression cushion blocks are arranged correspondingly, the two upper compression blocks are fixedly connected with the two compression plates respectively, the end faces, adjacent to the two compression plates, are provided with step structures, the step structures of the two compression plates form clamping grooves, and the bottoms of the floating joints are connected with the clamping grooves.

On the basis of the scheme, in another improved scheme, the device further comprises an annealing device for annealing the welded steel strip workpiece, wherein the anode of the annealing device is connected with the upper pressing block through a cable, and the cathode of the annealing device is connected with the pressing cushion block through a cable.

On the basis of the scheme, in another improved scheme, the middle positioning mechanism further comprises a rotary cylinder and a cylinder mounting plate, the cylinder mounting plate and the end positioning block are both arranged on the tool bottom plate, the fixed end of the rotary cylinder is mounted on the cylinder mounting plate, the end positioning block is connected with the movable end of the rotary cylinder, and the movable end of the rotary cylinder drives the end positioning block to be arranged between the tool bottom plates of the two workpiece positioning mechanisms or to leave the tool bottom plates of the two workpiece positioning mechanisms when rotating.

On the basis of the scheme, in another improved scheme, the middle positioning mechanism further comprises a protective cover used for containing the end positioning blocks, the protective cover is fixed on the tool bottom plates, and the end positioning blocks rotate between the two tool bottom plates and in the protective cover.

On the basis of the scheme, in another improved scheme, the moving mechanism comprises a horizontal moving shaft, a vertical moving shaft and a connecting plate; the horizontal moving shaft is arranged on the bottom mounting plate, the bottom surface and the vertical side surface of the connecting plate are respectively connected with the horizontal moving shaft and the vertical moving shaft, and the welding head mounting plate is arranged on the vertical moving shaft; the horizontal migration axle is used for driving the connecting plate and removes at the horizontal direction, and vertical removal axle is used for driving the soldered connection mounting panel and removes at vertical direction, and horizontal migration axle and vertical removal axle are each other to become 90 degrees contained angles.

On the basis of the scheme, in another improved scheme, the horizontal moving shaft is a servo shaft, and the vertical moving shaft comprises a screw rod and a guide rail.

On the basis of the scheme, in another improved scheme, the connecting plate is of an L-shaped structure, and reinforcing ribs are further arranged on the connecting plate.

On the basis of the scheme, in another improved scheme, the welding device further comprises an operating platform used for controlling the working states of the welding head moving platform, the butt welding tool, the laser and the electric control cabinet, and the operating platform comprises a display, an operating box and industrial control equipment which are sequentially and electrically connected.

On the basis of the scheme, in another improved scheme, the system further comprises an equipment cabinet, and the laser, the electric control cabinet and the water chiller are all arranged in the equipment cabinet.

On the basis of the scheme, in another improved scheme, a water cooler for cooling the laser is further arranged in the equipment cabinet.

On the basis of the scheme, in another improved scheme, a control system is preset in the industrial control equipment and controls the laser, the welding head moving platform, the annealing device and the butt welding tool according to program setting.

The invention has at least the following beneficial effects: the laser butt welding equipment for the steel strip is mainly used for butt joint and continuous welding of steel strip workpieces. The position of the butt welding joint is adjusted through the welding joint moving platform, the steel strip workpieces are positioned through the butt welding tool, and the abutted seam of the two steel strip workpieces is welded through the welding joint. The laser welding can improve the beauty of the welding seam, reduce the polishing amount of the welding seam, anneal the welding seam which is finished, improve the toughness of the welding seam and avoid the risk of fracture of the welding seam. The laser welding and annealing device is organically combined, the two steel belt workpieces are welded firstly and then welded and annealed, the clamping times are reduced, the production efficiency is improved, and the problem of using pain points of other similar welding equipment is effectively solved.

Drawings

FIG. 1 is a schematic structural view of a laser butt welding apparatus for a steel strip according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a welding head moving stage according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a butt welding tool in positioning a steel strip workpiece according to an embodiment of the present invention;

FIG. 4 is a front view of a butt welding tool in an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a butt welding tool with an upper pressing unit hidden according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an upper pressing unit according to an embodiment of the present invention;

fig. 7 is a schematic diagram of the connection between the equipment cabinet and the welding head according to an embodiment of the invention.

Reference numerals:

1-operation table 2-annealing device 3-welding head moving platform

4-equipment cabinet 5-butt welding tool 6-steel strip workpiece

7-laser 8-electric control cabinet 9-water cooling machine

3.1-bottom mounting plate 3.2-horizontal moving axis 3.3-vertical moving axis

3.4-connecting plate 3.5-welding head mounting plate 3.6-welding head

5.1-tool bottom plate 5.2-pressing cushion block 5.3-side positioning block

5.4-cylinder mounting base 5.5-pressing cylinder 5.6-upper pressing block

5.7-pressing plate 5.8-protective cover 5.9-rotary cylinder

5.10-end positioning block 5.11-guide shaft 5.12-floating joint

5.13-cylinder mounting plate 5.14-guide sleeve 7.1-optical fiber

7.2-Cooling Water pipe

Detailed Description

The following are presented as preferred embodiments of the invention to aid in a further understanding of the invention. It should be understood by those skilled in the art that the description of the embodiments of the present invention is by way of example only, and not by way of limitation.

Referring to the schematic drawings of fig. 1 to 7, the laser butt welding equipment for the steel strip in one embodiment of the invention comprises a welding head moving platform 3, a butt welding tool 5, a laser 7 and an electric control cabinet 8; the welding head moving platform 3 comprises a bottom mounting plate 3.1, a moving mechanism, a welding head mounting plate 3.5 and a welding head 3.6, wherein the moving mechanism is arranged on the bottom mounting plate 3.1, the welding head mounting plate 3.5 is arranged on the moving mechanism, the welding head 3.6 is arranged on the welding head mounting plate 3.5, and the moving mechanism is used for driving the welding head mounting plate 3.5 to move in the horizontal direction or the vertical direction; the butt welding tool 5 comprises a workpiece positioning mechanism and a middle positioning mechanism, the two workpiece positioning mechanisms are used for fixing two steel strip workpieces 6 respectively, the middle positioning mechanism comprises an end positioning block 5.10 which can rotate in a vertical plane, the end positioning block 5.10 can be rotatably arranged between the two workpiece positioning mechanisms to position the abutted seams of the two steel strip workpieces 6, and a welding head 3.6 is used for welding the abutted seams of the two steel strip workpieces 6; the laser 7 is connected with the welding head 3.6 through an optical fiber 7.1, and the electric control cabinet 8 provides power for the laser 7. The steel strip laser butt welding apparatus of the present embodiment is used for butt joint welding of the steel strip workpiece 6. The position of the butt welding joint 3.6 is adjusted through the welding joint moving platform 3, the steel strip workpieces 6 are positioned through the butt welding tool 5, and the abutted seams of the two steel strip workpieces 6 are welded through the welding joint 3.6.

Referring to the schematic diagrams of fig. 3 to 6, on the basis of the above embodiment, in another modified embodiment, the workpiece positioning mechanism includes a tool bottom plate 5.1, a side positioning block 5.3 and an upper pressing unit, the side positioning block 5.3 and the upper pressing unit are disposed on the tool bottom plate 5.1, the side positioning block 5.3 is used for positioning the side surface of the steel strip workpiece 6, and the upper pressing unit is used for vertically pressing the steel strip workpiece 6 on the tool bottom plate 5.1. Through setting up side locating piece 5.3 and last compressing tightly the unit, can fix a position at the horizontal plane and vertical to steel band work piece 6 on the frock bottom plate 5.1, remove when avoiding welding.

Referring to the illustrations of fig. 3 to fig. 6, on the basis of the above embodiment, in another modified embodiment, the upper pressing unit includes a cylinder mounting seat 5.4, a pressing cylinder 5.5, an upper pressing assembly, a guide shaft 5.11 and a guide sleeve 5.14, the cylinder mounting seat 5.4 is fixedly connected to the tooling bottom plate 5.1, the pressing cylinder 5.5 is mounted on the cylinder mounting seat 5.4, the upper pressing assembly is connected to a movable end of the pressing cylinder 5.5, the guide sleeve 5.14 is fixed to the cylinder mounting seat 5.4, the guide shaft 5.11 is fixed to the upper pressing assembly, the guide shaft 5.11 is vertically movably disposed in the guide sleeve 5.14, and the movable end of the pressing cylinder 5.5 drives the upper pressing assembly to vertically approach or leave the tooling bottom plate 5.1 when vertically moving. The pressing assembly is driven by the pressing cylinder 5.5 to press the steel strip workpiece 6 arranged on the tool bottom plate 5.1, and the vertical moving path of the pressing cylinder 5.5 is ensured not to deviate by arranging the guide shaft 5.11 and the guide sleeve 5.14.

Referring to the illustrations of fig. 3 to 6, on the basis of the above embodiment, in another modified embodiment, the upper pressing assembly comprises a floating joint 5.12, a pressing plate 5.7 and an upper pressing block 5.6, wherein the top of the floating joint 5.12 is fixed at the bottom of the movable end of the pressing cylinder 5.5, the bottom of the floating joint 5.12 is connected with the pressing plate 5.7, a guide shaft 5.11 is fixed on the upper surface of the pressing plate 5.7, and the upper pressing block 5.6 is fixed on one side of the upper surface of the pressing plate 5.7; when the movable end of the pressing cylinder 5.5 vertically moves, the floating joint 5.12, the pressing plate 5.7 and the upper pressing block 5.6 are driven to vertically approach or leave the tool bottom plate 5.1. Through setting up floating joint 5.12, clamp plate 5.7 and last compact heap 5.6, compress tightly 5.5 during operation with the even dispersion of pressure to floating joint 5.12, clamp plate 5.7 and go up compact heap 5.6 on, can be with reliable location of steel band work piece 6 on frock bottom plate 5.1 like this.

With reference to the schematic diagrams of fig. 3 to 5, on the basis of the above embodiment, in another modified embodiment, the fixture further includes a pressure pad 5.2, the pressure pad 5.2 is disposed on the upper surface of the fixture base plate 5.1, the side positioning block 5.3 is disposed on one side of the pressure pad 5.2, the upper pressure block 5.6 is disposed above the pressure pad 5.2, and the steel strip workpiece 6 to be positioned is disposed between the pressure pad 5.2 and the upper pressure block 5.6.

Referring to the schematic diagrams of fig. 3 to 5, on the basis of the above embodiment, in another modified embodiment, two compression cushion blocks 5.2 are arranged on two sides of the upper surface of the tool bottom plate 5.1, two upper compression blocks 5.6 are arranged corresponding to the two compression cushion blocks 5.2, the two upper compression blocks 5.6 are respectively and fixedly connected with two pressing plates 5.7, the end surfaces of the two pressing plates 5.7 adjacent to each other are provided with step structures, the step structures of the two pressing plates 5.7 form clamping grooves, and the bottoms of the floating joints 5.12 are connected with the clamping grooves. Through setting up two and compressing tightly cushion 5.2, two and go up compact heap 5.6 and two floating joint 5.12, can separate the more even dispersion of pressure that compresses tightly cylinder 5.5, avoid the local pressurized of steel band work piece 6 to produce and warp.

Referring to the schematic illustration of fig. 1, on the basis of the above embodiment, in another modified embodiment, the annealing device 2 is further included for annealing the welded steel strip workpiece 6, the positive pole of the annealing device 2 is connected with the upper pressing block 5.6 through a cable, and the negative pole of the annealing device 2 is connected with the pressing pad 5.2 through a cable. The annealing device 2 is used for annealing the welded steel strip, so that the weld performance of the steel strip is improved, the toughness of the weld is improved, and the condition of weld fracture is avoided. The annealing device 2 is a conventional device, and the structure thereof is not described in detail.

Referring to the schematic diagrams of fig. 3 to fig. 5, on the basis of the above embodiment, in another modified embodiment, the middle positioning mechanism further includes a rotary cylinder 5.9 and a cylinder mounting plate 5.13, the cylinder mounting plate 5.13 and the end positioning block 5.10 are both disposed on the tooling bottom plate 5.1, a fixed end of the rotary cylinder 5.9 is mounted on the cylinder mounting plate 5.13, the end positioning block 5.10 is connected with a movable end of the rotary cylinder 5.9, and when the movable end of the rotary cylinder 5.9 rotates, the movable end positioning block 5.10 is driven to be disposed between the tooling bottom plates 5.1 of the two workpiece positioning mechanisms or to leave the tooling bottom plates 5.1 of the two workpiece positioning mechanisms. The end positioning block 5.10 can be driven to rotate by arranging the rotary cylinder 5.9, and when the end positioning block 5.10 is positioned between the tool bottom plates 5.1 of the two workpiece positioning mechanisms, the end positioning block 5.10 provides positioning for the end part of the steel strip workpiece 6; when two steel strip workpieces 6 are butted, the rotary cylinder 5.9 drives the end positioning block 5.10 to leave between the tool bottom plates 5.1 of the two workpiece positioning mechanisms, so that the influence on laser welding is avoided.

Referring to the illustrations of fig. 3 to 5, in another modified embodiment based on the above embodiment, the middle positioning mechanism further includes a protection cover 5.8 for accommodating the end positioning block 5.10, the protection cover 5.8 is fixed on the tooling bottom plate 5.1, and the end positioning block 5.10 rotates between the two tooling bottom plates 5.1 and the protection cover 5.8. The protective cover 5.8 is used for preventing the protective end positioning block 5.10 from hurting operators in the rotating process.

With reference to the schematic illustration of fig. 2, on the basis of the above embodiment, in another modified embodiment, the moving mechanism includes a horizontal moving shaft 3.2, a vertical moving shaft 3.3 and a connecting plate 3.4; the horizontal moving shaft 3.2 is arranged on the bottom mounting plate 3.1, the bottom surface and the vertical side surface of the connecting plate 3.4 are respectively connected with the horizontal moving shaft 3.2 and the vertical moving shaft 3.3, and the welding head mounting plate 3.5 is arranged on the vertical moving shaft 3.3; the horizontal movement shaft 3.2 is used for driving the connecting plate 3.4 to move in the horizontal direction, the vertical movement shaft 3.3 is used for driving the welding head mounting plate 3.5 to move in the vertical direction, and the horizontal movement shaft 3.2 and the vertical movement shaft 3.3 mutually form an included angle of 90 degrees.

Referring to the schematic illustration of fig. 2, on the basis of the above embodiment, in another modified embodiment, the horizontal moving shaft 3.2 is a servo shaft, and the vertical moving shaft 3.3 includes a screw rod and a guide rail. The horizontal moving shaft 3.2 is used for adjusting the welding head 3.6 to be aligned with the welding line, the vertical moving shaft 3.3 is convenient for adjusting the focal length of the welding head 3.6 in the debugging process, and the welding head mounting plate 3.5 is fixed on the vertical moving shaft 3.3 and is provided with the welding head 3.6.

Referring to the schematic diagram of fig. 2, on the basis of the above embodiment, in another modified embodiment, the connecting plate 3.4 is in an L-shaped structure, and the connecting plate 3.4 is further provided with a reinforcing rib. The strength of the connecting plate 3.4 can be improved by arranging the reinforcing ribs.

Referring to the schematic diagram of fig. 1, on the basis of the above embodiment, in another modified embodiment, the welding head welding device further includes an operation table 1 for controlling the working states of the welding head moving platform 3, the butt welding tool 5, the laser 7 and the electric control cabinet 8, and the operation table 1 includes a display, an operation box and an industrial control device which are electrically connected in sequence. The operation platform 1 is installed to complete the man-machine interaction of the equipment and control the overall action condition of the equipment.

In addition to the embodiment described above, in another modified embodiment, a water chiller 9 for cooling the laser 7 is further provided in the equipment cabinet 4, as schematically shown in fig. 7. In another improved embodiment, the system further comprises an equipment cabinet 4, and the laser 7, the electric control cabinet 8 and the water chiller 9 are arranged in the equipment cabinet 4. The equipment cabinet 4 is internally provided with a laser 7, a water chiller 9 and an electric control cabinet 8. The laser 7 is cooled by a water cooler 9 in the process of generating energy, the laser 7 is connected with the water cooler 9 by a cooling water pipe 7.2, and the laser 7 is connected with a welding head 3.6 through an optical fiber 7.1 for energy transmission; meanwhile, the water chiller 9 supplies cooling water to the welding head 3.6 through the cooling water pipe 7.2, and the electric control cabinet 8 provides power guarantee for the laser 7.

Referring to fig. 1 to 7, an operation flow of a steel strip laser butt welding apparatus according to an embodiment of the present invention will be briefly described:

1. manually starting a button, and rotating an air cylinder 5.9 to drive an end positioning block 5.10 to move to a working position;

2. manually feeding, namely placing a first steel strip workpiece 6 on one of workpiece positioning mechanisms of a butt welding tool 5, positioning by using an end positioning block 5.10 and a side positioning block 5.3, and then starting a pressing cylinder 5.5 to drive an upper pressing assembly to vertically clamp the first steel strip workpiece 6 on a tool bottom plate 5.1;

3. starting the rotary cylinder 5.9 to drive the end positioning block 5.10 to rotate until the end positioning block 5.10 is arranged in the protective cover 5.8;

4. manually feeding, namely placing a second steel strip workpiece 6 on the other workpiece positioning mechanism of the butt welding tool 5, positioning by using the side positioning block 5.3 and the end part of the first steel strip workpiece 6, and then starting the pressing cylinder 5.5 to vertically clamp the second steel strip workpiece 6;

5. manually starting the button, driving a welding head 3.6 to move by a moving mechanism, and welding the abutted seams of the first steel strip workpiece 6 and the second steel strip workpiece 6 by the welding head 3.6;

6. starting the annealing device 2 to anneal the welded steel strip workpiece 6;

7. after welding, the moving mechanism drives the welding head 3.6 to return to the initial position and gives an in-place signal;

8. after the annealing is finished, the pressing cylinder 5.5 loosens the steel strip workpiece 6;

9. and manually taking away the welded workpiece.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting the protection scope thereof, and although the present application is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: numerous variations, modifications, and equivalents will occur to those skilled in the art upon reading the present application and are within the scope of the claims as issued or as granted.

Claims

1. The laser butt welding equipment for the steel strip is characterized by comprising a welding head moving platform, a butt welding tool, a laser and an electric control cabinet; the welding head moving platform comprises a bottom mounting plate, a moving mechanism, a welding head mounting plate and a welding head, wherein the moving mechanism is arranged on the bottom mounting plate, the welding head mounting plate is arranged on the moving mechanism, the welding head is arranged on the welding head mounting plate, and the moving mechanism is used for driving the welding head mounting plate to move in the horizontal direction or the vertical direction; the butt welding tool comprises a workpiece positioning mechanism and a middle positioning mechanism, the two workpiece positioning mechanisms are used for fixing two steel strip workpieces respectively, the middle positioning mechanism comprises an end positioning block which can rotate in a vertical plane, the end positioning block can be rotatably arranged between the two workpiece positioning mechanisms to position the abutted seams of the two steel strip workpieces, and the welding head is used for welding the abutted seams of the two steel strip workpieces; the laser is connected with the welding head through an optical fiber, and the electric control cabinet provides electric power for the laser.

2. The steel strip laser butt welding equipment according to claim 1, wherein the workpiece positioning mechanism comprises a tool base plate, a side positioning block and an upper pressing unit, the side positioning block and the upper pressing unit are arranged on the tool base plate, the side positioning block is used for positioning the side face of the steel strip workpiece, and the upper pressing unit is used for vertically pressing the steel strip workpiece on the tool base plate.

3. The steel strip laser butt welding equipment according to claim 2, wherein the upper compressing unit comprises a cylinder mounting seat, a compressing cylinder, an upper compressing assembly, a guide shaft and a guide sleeve, the cylinder mounting seat is fixedly connected to the tool bottom plate, the compressing cylinder is mounted on the cylinder mounting seat, the upper compressing assembly is connected with the movable end of the compressing cylinder, the guide sleeve is fixed to the cylinder mounting seat, the guide shaft is fixed to the upper compressing assembly, the guide shaft is vertically movably arranged in the guide sleeve, and the movable end of the compressing cylinder drives the upper compressing assembly to be vertically close to or far away from the tool bottom plate when moving vertically.

4. The steel strip laser butt welding equipment according to claim 3, wherein the upper pressing assembly comprises a floating joint, a pressing plate and an upper pressing block, the top of the floating joint is fixed to the bottom of the movable end of the pressing cylinder, the bottom of the floating joint is connected with the pressing plate, the guide shaft is fixed to the upper surface of the pressing plate, and the upper pressing block is fixed to one side of the upper surface of the pressing plate; and when the movable end of the pressing cylinder vertically moves, the floating joint, the pressing plate and the upper pressing block are driven to be vertically close to or far away from the tool bottom plate.

5. The steel strip laser butt welding equipment according to claim 4, further comprising a pressing cushion block, wherein the pressing cushion block is arranged on the upper surface of the tool baseplate, the side positioning block is arranged on one side of the pressing cushion block, the upper pressing block is arranged above the pressing cushion block, and a steel strip workpiece to be positioned is arranged between the pressing cushion block and the upper pressing block.

6. The steel strip laser butt welding equipment according to claim 5, further comprising an annealing device for annealing the welded steel strip workpiece, wherein a positive electrode of the annealing device is connected with the upper pressing block through a cable, and a negative electrode of the annealing device is connected with the pressing cushion block through a cable.

7. The laser butt welding equipment for the steel strip according to any one of claims 2 to 6, wherein the middle positioning mechanism further comprises a rotary cylinder and a cylinder mounting plate, the cylinder mounting plate and the end positioning block are both disposed on the tool base plate, a fixed end of the rotary cylinder is mounted on the cylinder mounting plate, the end positioning block is connected with a movable end of the rotary cylinder, and the movable end of the rotary cylinder drives the end positioning block to be disposed between the tool base plates of the two workpiece positioning mechanisms or to leave the tool base plates of the two workpiece positioning mechanisms when rotating.

8. The steel strip laser butt welding equipment according to claim 7, wherein the middle positioning mechanism further comprises a protective cover for accommodating the end positioning block, and the protective cover is fixed on the tooling bottom plate.

9. The apparatus for laser butt welding of steel strip according to claim 7, wherein the moving mechanism includes a horizontal moving shaft, a vertical moving shaft, and a connecting plate; the horizontal moving shaft is arranged on the bottom mounting plate, the bottom surface and the vertical side surface of the connecting plate are respectively connected with the horizontal moving shaft and the vertical moving shaft, and the welding head mounting plate is arranged on the vertical moving shaft; the horizontal moving shaft is used for driving the connecting plate to move in the horizontal direction, and the vertical moving shaft is used for driving the welding head mounting plate to move in the vertical direction.

10. The steel strip laser butt welding equipment according to claim 7, further comprising an operation console for controlling the working states of the welding head moving platform, the butt welding tool, the laser and the electric control cabinet, wherein the operation console comprises a display, an operation box and industrial control equipment which are electrically connected in sequence.