阅读说明：本技术 一种圆筒直缝连续缝焊电阻焊机及焊接方法 (Cylindrical straight seam continuous seam welding resistance welder and welding method ) 是由 杨健 颜继 于 2019-10-31 设计创作，主要内容包括：一种圆筒直缝连续缝焊电阻焊机及焊接方法,包括壳体、上电极总成和下电极总成；上电极总成包括主动焊轮；下电极总成包括工件导向装置和从动焊轮,从动焊轮设置在工件导向装置的端部；上电极总成设置在壳体的上部,下电极总成设置在壳体的下部；主动焊轮设置在从动焊轮的正上方；具有结构简单、能够满足焊接长度的要求、精度高、效率高和焊接质量好的优点,不但能自动对齐焊缝,而且实现了工件自动送料、自动焊接和自动出料的自动化操作,使得焊接精度高、降低工人劳动强度、生产效率高、产量高,特别适用于大长度圆筒的连续直缝焊接。(A cylinder straight seam continuous seam welding resistance welder and a welding method thereof comprise a shell, an upper electrode assembly and a lower electrode assembly; the upper electrode assembly includes a drive weld wheel; the lower electrode assembly comprises a workpiece guide device and a driven welding wheel, and the driven welding wheel is arranged at the end part of the workpiece guide device; the upper electrode assembly is arranged at the upper part of the shell, and the lower electrode assembly is arranged at the lower part of the shell; the driving welding wheel is arranged right above the driven welding wheel; the automatic straight-seam welding machine has the advantages of simple structure, capability of meeting the requirement of welding length, high precision, high efficiency and good welding quality, can automatically align welding seams, realizes automatic operation of automatic feeding, automatic welding and automatic discharging of workpieces, has high welding precision, reduces the labor intensity of workers, has high production efficiency and high yield, and is particularly suitable for continuous straight-seam welding of large-length cylinders.)

1. A cylindrical straight seam continuous seam welding resistance welder comprises a shell (1), an upper electrode assembly (2) and a lower electrode assembly (3); the method is characterized in that:

the upper electrode assembly (2) comprises a driving welding wheel (11);

the lower electrode assembly (3) comprises a workpiece guide device (15) and a driven welding wheel (20), wherein the driven welding wheel (20) is arranged at the end part of the workpiece guide device (15);

the upper electrode assembly (2) is arranged at the upper part of the shell (1), and the lower electrode assembly (3) is arranged at the lower part of the shell (1); the driving welding wheel (11) is arranged right above the driven welding wheel (20).

2. The cylindrical straight seam continuous seam welding resistance welder according to claim 1, characterized in that: the upper electrode assembly (2) comprises a first mounting seat (5), a cylinder seat (7), a cylinder (8), a piston arm (9), a square copper seat (10), a driving welding wheel (11), a driving shaft (12) and an upper conducting bar (13); the first mounting seat (5) is arranged on the front side of the shell (1), a cylinder seat (7) is arranged at the front end of the first mounting seat (5), a cylinder (8) is arranged at the upper end of the cylinder seat (7), a piston arm (9) is connected to the lower end of the cylinder (8), a square copper seat (10) is connected to the lower end of the piston arm (9), a driving shaft (12) is rotatably arranged in the square copper seat (10), and a driving welding wheel (11) is fixedly arranged at one end of the driving shaft; the lower end of the square copper seat (10) is connected with an upper conducting bar (13).

3. The cylindrical straight seam continuous seam welding resistance welder according to claim 1, characterized in that: lower electrode assembly (3) include second mount pad (14), work piece guider (15), driven welding wheel (20) and square bar copper (21), second mount pad (14) set up the front side at casing (1), be provided with work piece guider (15) on second mount pad (14), work piece guider (15) lower extreme is connected with square bar copper (21), the one end of square bar copper (21) is connected with driven welding wheel (20) with rotatable mode.

4. The cylindrical straight seam continuous seam welding resistance welder according to claim 1, characterized in that: the workpiece guide device (15) comprises a first guide ring (16), a chute plate (19), a front tongue (22), a secondary guide ring (24) and a second guide ring (25); the lower electrode assembly (3) comprises a second mounting seat (14), and the upper end of the chute plate (19) is fixedly connected with the second mounting seat (14); two ends of the chute plate (19) are respectively connected with a first guide ring (16) and a second guide ring (25) in a detachable mode, and one side of the second guide ring (25) is connected with a secondary guide ring (24); a lower sliding groove (18) is arranged on the front side of the sliding groove plate (19), an upper sliding groove (17) is arranged on the rear side of the sliding groove plate (19), a front tongue (22) is arranged at one end of the sliding groove plate (19), and a front tongue sliding groove (23) is arranged on the front tongue (22); the front tongue sliding groove (23) is communicated with the upper sliding groove (17) and the lower sliding groove (18); the lower electrode assembly (3) comprises a driven welding wheel (20) and a square copper rod (21), the lower end of the sliding groove plate (19) is fixedly connected with the square copper rod (21), and the driven welding wheel (20) is positioned inside the secondary guide ring (24); the straight line where the front tongue sliding groove (23) is located is tangent to the driven welding wheel (20).

5. The cylindrical straight seam continuous seam welding resistance welder according to claim 1, characterized in that: the lower electrode assembly (3) comprises a workpiece guide device (15) and a lower conducting bar (26), the workpiece guide device (15) comprises a chute plate (19), one end of the chute plate (19) is provided with a guide hole (27), and the guide hole (27) penetrates through the chute plate (19) from top to bottom; the lower conducting bar (26) passes through the guide hole (27) from the upper end of the guide hole (27) and is connected with the square copper rod (21).

6. The cylindrical straight seam continuous seam welding resistance welder according to claim 1, characterized in that: a first water pipe and a second water pipe are arranged in the shell, the upper electrode assembly (2) comprises a square copper seat (10), the lower electrode assembly (3) comprises a workpiece guide device (15), a driven welding wheel (20) and a square copper rod (21), the workpiece guide device (15) comprises a sliding groove plate (19), and one end of the sliding groove plate (19) is provided with a guide hole (27); a first spray head is arranged on the square copper seat (10) and communicated with a first water pipe; and a second spray head is arranged at one end of the square copper rod (21) close to the driven welding wheel (20), and the second water pipe penetrates through the guide hole (27) from the upper end of the guide hole (27) and is communicated with the second spray head.

7. The cylindrical straight seam continuous seam welding resistance welder according to claim 1, characterized in that: the workpiece guide device (15) is made of alloy steel, and the front tongue (22) is made of wear-resistant die steel.

8. The machine according to claim 4, wherein the diameter of the first guide ring (16) is greater than the diameter of the second guide ring (25) by 1 mm ~ 3 mm, and the first guide ring (16) is provided with a chamfer.

9. A welding method applied to the welding apparatus according to any one of claims 1 to 8, comprising the steps of:

the method comprises the following steps: connecting at least two meshes end to form a mesh connecting piece;

step two: rolling the mesh sheet connecting piece into a cylinder shape to form a mesh cylinder;

step three: putting two sides of the net drum into an upper chute (17) and a lower chute (18) respectively to insert the net drum into a workpiece guide device (15), and moving one end of the net drum above a driven welding wheel (20);

step four: the driving welding wheel (11) is pressed down until the net cylinder is tightly pressed between the driving welding wheel (11) and the driven welding wheel (20);

step five: the driving welding wheel (11) is driven to rotate through the driving shaft (12) so as to drive the net barrel to move, and the net barrel is electrified to be welded to form continuous welding seams until the net barrel is welded, the power is cut off, and the driving welding wheel (11) is lifted to finish welding.

10. The welding method as defined in claim 9, wherein in step three, the vertical projections of the two sides of the mesh cylinder are overlapped with each other, and the overlapped width is 3 mm ~ 5 mm.

The technical field is as follows:

the invention relates to the technical field of resistance welding machines, in particular to a cylindrical straight seam continuous seam welding resistance welding machine and a welding method.

Background art:

resistance welding is a method of welding by applying pressure while locally heating a workpiece by using resistance heat generated by passing a current through the workpiece and a contact portion as a heat source. During welding, metal does not need to be filled, the production efficiency is high, the deformation of a weldment is small, and the automation is easy to realize.

The existing cylinder linear seam welder is mostly fixed by a lower electrode copper bar, an upper welding wheel is welded along the linear walking of a welding line, and the cylinder seam welder is suitable for thin plates, filter screens and other thin parts within 0.5mm of welding thickness. The problems of the cylinder seam welding machine are as follows: the mesh cylinder has higher requirements on the length of the lower electrode copper bar, and can be welded on cylinders with the length within one meter, but after the length of the mesh cylinder is increased, for example, when the length is more than two meters or even more than tens of meters, the welding machine cannot weld due to the rigidity problem of the lower electrode copper bar. In the prior art, the long cylinder needs to be welded in sections and then is butted and connected into a workpiece meeting the length requirement, so that the workpiece is not only complicated to weld, but also the precision after butting is not guaranteed; the existing welding machine has the advantages of low precision, high welding quality influence, high time consumption, low yield, and great difficulty because the operation skill of an operator can only be improved if the precision is improved.

The invention content is as follows:

in order to solve the problems and overcome the defects of the prior art, the invention provides the cylindrical straight seam continuous seam welding resistance welder and the welding method, which have the advantages of simple structure, high precision, high efficiency and good welding quality, and can meet the requirement of welding length.

In order to achieve the purpose, the invention provides a cylindrical straight seam continuous seam welding resistance welding machine, which comprises a shell, an upper electrode assembly and a lower electrode assembly;

the upper electrode assembly includes a drive weld wheel;

the lower electrode assembly comprises a workpiece guide device and a driven welding wheel, and the driven welding wheel is arranged at the end part of the workpiece guide device;

the upper electrode assembly is arranged at the upper part of the shell, and the lower electrode assembly is arranged at the lower part of the shell; the driving welding wheel is arranged right above the driven welding wheel.

Further, the upper electrode assembly comprises a first mounting seat, a cylinder, a piston arm, a square copper seat, a driving welding wheel, a driving shaft and an upper conducting bar; the first mounting seat is arranged on the front side of the shell, a cylinder seat is arranged at the front end of the first mounting seat, a cylinder is arranged at the upper end of the cylinder seat, a piston arm is connected to the lower end of the cylinder, a square copper seat is connected to the lower end of the piston arm, a driving shaft is rotatably arranged in the square copper seat, and a driving welding wheel is fixedly arranged at one end of the driving shaft; the lower end of the square copper seat is connected with an upper conducting bar.

Further, the lower electrode assembly comprises a second mounting seat, a workpiece guide device, a driven welding wheel and a square copper rod, the second mounting seat is arranged on the front side of the shell, the workpiece guide device is arranged on the second mounting seat, the lower end of the workpiece guide device is connected with the square copper rod, and one end of the square copper rod is connected with the driven welding wheel in a rotatable mode.

Further, the workpiece guide device comprises a first guide ring, a chute plate, a front tongue, a secondary guide ring and a second guide ring; the lower electrode assembly comprises a second mounting seat, and the upper end of the chute plate is fixedly connected with the second mounting seat; two ends of the chute plate are respectively connected with a first guide ring and a second guide ring in a detachable mode, and one side of the second guide ring is connected with a secondary guide ring; a lower sliding groove is formed in the front side of the sliding groove plate, an upper sliding groove is formed in the rear side of the sliding groove plate, a front tongue is arranged at one end of the sliding groove plate, and a front tongue sliding groove is formed in the front tongue; the front tongue sliding groove is communicated with the upper sliding groove and the lower sliding groove; the lower electrode assembly comprises a driven welding wheel and a square copper rod, the lower end of the sliding chute plate is fixedly connected with the square copper rod, and the driven welding wheel is positioned inside the secondary guide ring; the straight line where the front tongue sliding groove is positioned is tangent to the driven welding wheel.

Furthermore, the lower electrode assembly comprises a workpiece guide device and a lower conducting bar, the workpiece guide device comprises a chute plate, one end of the chute plate is provided with a guide hole, and the guide hole penetrates through the chute plate from top to bottom; the lower conducting bar penetrates through the guide hole from the upper end of the guide hole and is connected with the square copper rod.

Furthermore, a first water pipe and a second water pipe are arranged in the shell, the upper electrode assembly comprises a square copper seat, the lower electrode assembly comprises a workpiece guide device, a driven welding wheel and a square copper rod, the workpiece guide device comprises a chute plate, and one end of the chute plate is provided with a guide hole; the square copper seat is provided with a first spray head which is communicated with a first water pipe; and a second spray head is arranged at one end of the square copper rod close to the driven welding wheel, and a second water pipe penetrates through the guide hole from the upper end of the guide hole and is communicated with the second spray head.

Furthermore, the workpiece guide device is made of alloy steel, and the front tongue is made of wear-resistant die steel.

Furthermore, the diameter of the first guide ring is larger than that of the second guide ring by 1 mm and ~ 3 mm, and a chamfer is arranged on the first guide ring.

The invention also provides a welding method, wherein the welding method is applied to the welding device, and the welding method comprises the following steps:

the method comprises the following steps: connecting at least two meshes end to form a mesh connecting piece;

step two: rolling the mesh sheet connecting piece into a cylinder shape to form a mesh cylinder;

step three: placing two sides of the net drum into the upper chute and the lower chute respectively to insert the net drum into the workpiece guide device, and moving one end of the net drum to be above the driven welding wheel;

step four: the driving welding wheel is pressed downwards until the net barrel is tightly pressed between the driving welding wheel and the driven welding wheel;

step five: the driving welding wheel is driven to rotate through the driving shaft so as to drive the net barrel to move, the net barrel is electrified to be welded to form a continuous welding line, and the power is cut off and the driving welding wheel is lifted to finish welding until the net barrel is welded.

Further, in step three, the vertical projections of the two sides of the net cylinder are overlapped with each other, and the overlapped width is ~ 5 mm.

The invention has the beneficial effects that:

the cylinder straight seam continuous seam welding resistance welding machine provided by the invention has the advantages of simple structure, high precision, high efficiency and good welding quality, can meet the requirement of welding length, not only can automatically align the welding seam, but also realizes the automatic operation of automatic feeding, automatic welding and automatic discharging of workpieces, so that the welding precision is high, the labor intensity of workers is reduced, the production efficiency is high, the yield is high, and the welding machine is particularly suitable for the continuous straight seam welding of large-length cylinders.

The driving welding wheel and the driven welding wheel are arranged to change the welding direction from the traditional direction perpendicular to the welding machine to the direction parallel to the welding machine, so that the straight welding length is not limited by the length of the lower electrode copper rod any more, and the infinite straight welding can be realized theoretically; and the welded parts do not need to be connected after welding, so that a large number of subsequent steps are omitted, a large amount of time and energy are saved, and the efficiency is greatly improved.

Through the rolling and the rotation of the driving welding wheel and the driven welding wheel, the net barrel can be driven to move forwards by the action force parallel to the front direction and is welded in the moving process, and therefore automatic moving, automatic welding and automatic discharging are achieved.

Through setting up spout, lower spout, first guide ring and second guide ring for the both sides of a net section of thick bamboo are pressed close to gradually and are closed and draw close, and size standard, the position is accurate, thereby makes welding quality good, and is efficient.

Be provided with the guide hole in the spout board, keep away from spout and lower spout through the guide hole to on guiding the circuit to the square bar copper from the guide hole, how the problem of leading from the welding wheel of circuit when having solved the welding of net section of thick bamboo.

Description of the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged schematic view of the upper electrode assembly structure of the present invention;

FIG. 3 is an enlarged schematic view of the lower electrode assembly structure of the present invention;

FIG. 4 is a schematic side view of the lower electrode assembly configuration of the present invention;

FIG. 5 is a schematic view of the construction of the workpiece guide apparatus of the present invention;

FIG. 6 is a schematic view of the construction of the workpiece guide apparatus of the present invention;

FIG. 7 is a flow chart of a welding method of the present invention;

in the drawings: 1. the welding device comprises a shell, 2, an upper electrode assembly, 3, a lower electrode assembly, 4, supporting legs, 5, a first mounting seat, 6, a shield, 7, a cylinder seat, 8, a cylinder, 9, a piston arm, 10, a square copper seat, 11, a driving welding wheel, 12, a driving shaft, 13, an upper conducting bar, 14, a second mounting seat, 15, a workpiece guide device, 16, a first guide ring, 17, an upper chute, 18, a lower chute, 19, a chute plate, 20, a driven welding wheel, 21, a square copper rod, 22, a front tongue, 23, a front tongue chute, 24, a secondary guide ring, 25, a second guide ring, 26, a lower conducting bar, 27 and a guide hole.

The specific implementation mode is as follows:

in order to make the implementation objects, technical solutions and advantages of the present invention more clear, the present invention will be described in more detail below with reference to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6 and fig. 7 of the present invention.

The cylindrical straight seam continuous seam welding resistance welding machine comprises a shell 1, an upper electrode assembly 2 and a lower electrode assembly 3, wherein the upper electrode assembly 2 comprises a driving welding wheel 11, the lower electrode assembly 3 comprises a workpiece guide device 15 and a driven welding wheel 20, the driven welding wheel 20 is arranged at the end part of the workpiece guide device 15, the upper electrode assembly 2 is arranged at the upper part of the shell 1, the lower electrode assembly 3 is arranged at the lower part of the shell 1, the driving welding wheel 11 is arranged right above the driven welding wheel 20, the upper electrode assembly 2 comprises a first mounting seat 5, a cylinder seat 7, a cylinder 8, a piston arm 9, a square copper seat 10, the driving welding wheel 11, a driving shaft 12 and an upper conductive row 13, the first mounting seat 5 is arranged at the front side of the shell 1, a cylinder seat 7 is arranged at the front end of the first mounting seat 5, a cylinder 8 is arranged at the upper end of the cylinder seat 7, a piston arm 9 is connected with the lower end of the piston arm 9, the lower end of the piston arm 9 is connected with a copper seat 10, the interior of the copper seat 10 is rotatably provided with a second guide device 12, a fixed by a guide plate 19, the guide plate 14 is arranged at one end of the first mounting seat 5, the guide plate 19, the guide plate 21 is connected with a guide plate 19, the guide plate 21 is connected with a second guide plate 19, the guide plate 15, the guide plate 19, the guide plate 16, the guide plate 21 is connected with a guide plate 19, the guide plate 15 is connected with a guide plate 15, the guide plate 19, the guide plate 16, the guide plate 15 is connected with the guide plate 15, the guide plate 16, the guide plate 21 is connected with the guide plate 15, the guide plate 16, the guide plate 21, the guide plate 15 is connected with the guide plate 15, the guide plate 16, the guide plate 21, the guide plate 16, the guide plate 21 is connected with the guide plate, the guide plate 21, the guide plate 21 is connected with the guide plate 21, the guide plate 21 is connected with the guide plate 21, the guide plate 15, the guide plate 21, the guide plate 21 is connected with the guide plate 21, the guide plate 15 is connected with the guide plate 21, the guide plate 21 is connected with the guide plate, the guide.

The invention also provides a welding method, which comprises the following steps:

the method comprises the following steps: connecting at least two meshes end to form a mesh connecting piece;

step two: rolling the mesh sheet connecting piece into a cylinder shape to form a mesh cylinder;

step three: placing the two sides of the net drum into the upper chute 17 and the lower chute 18 respectively to insert the net drum into the workpiece guide device 15 and moving one end of the net drum above the driven welding wheel 20;

step four: the driving welding wheel 11 is pressed down until the net cylinder is tightly pressed between the driving welding wheel 11 and the driven welding wheel 20;

step five: the driving welding wheel 11 is driven to rotate through the driving shaft 12 so as to drive the net drum to move, and the net drum is electrified to be welded to form a continuous welding seam until the net drum is welded, the power is cut off, and the driving welding wheel 11 is lifted to finish welding.

Furthermore, in the third step, the vertical projections of the two sides of the net cylinder are overlapped, and the overlapped width is 3 mm ~ 5mm

One of the embodiments of the invention is as follows:

the present invention can be divided into two parts, namely an upper electrode assembly 22 and a lower cantilever assembly 3; the upper electrode assembly 22 is arranged at the upper part of the shell 11, and the lower cantilever assembly 3 is arranged at the lower part of the shell 11;

the upper electrode assembly 2 comprises a first mounting seat 5, a cylinder seat 7, a cylinder 8, a piston arm 9, a square copper seat 10, a driving welding wheel 11, a driving shaft 12 and an upper conducting bar 13, wherein the first mounting seat 5 is fixedly arranged at the upper part of the shell 1, an opening is formed in the upper part of the shell 1, a transformer is arranged in the shell 1, and the transformer is connected with the upper conducting bar 13 and is connected with the upper electrode assembly 2 through the upper conducting bar 13; a driving motor is arranged in the shell 1, is connected with a driving shaft 12 through a universal joint and is connected with the upper electrode assembly 2 through the driving shaft 12; the upper conductor bar 13 and the drive drawer pass through an opening in the upper part of the housing 1.

The cylinder block 7 is fixedly arranged on the front side of the first mounting seat 5, the cylinder 8 is fixedly arranged on the upper portion of the cylinder block 7, the lower portion of the cylinder 8 is connected with a piston arm 9, and when the cylinder 8 contracts to be in the shortest state, the edge of the lower end of the piston arm 9 is slightly lower than the edge of the lower end of the cylinder block 7. When the cylinder 8 is extended, the piston arm 9 is driven by the cylinder 8 to move downward, and when the cylinder 8 is contracted, the piston arm 9 is driven by the cylinder 8 to move upward. The lower end of the piston device is connected with a square copper seat 10, a driving shaft 12 penetrates through the square copper seat 10, and the driving shaft 12 can freely rotate relative to the square copper seat 10; the front end of the driving shaft 12 is fixedly connected with the driving welding wheel 11, the rear end of the driving shaft 12 is connected with a driving motor through a universal joint, and the driving motor applies driving force to the driving welding wheel 11 through the driving shaft 12. The rotation direction of the driving welding wheel 11 is clockwise rotation. The lower end of the square copper seat 10 is connected with an upper conducting bar 13, and the other end of the upper conducting bar 13 is connected with a transformer.

The lower electrode assembly 3 comprises a second mounting seat 14, a workpiece guide device 15, a driven welding wheel 20 and a square copper rod 21, the workpiece guide device 15 comprises a first guide ring 16, a sliding groove plate 19, a front tongue 22, a secondary guide ring 24 and a second guide ring 25, the second mounting seat 14 is fixedly mounted at the lower portion of the shell, the second mounting seat 14 is provided with the sliding groove plate 19, the lower end of the sliding groove plate 19 is fixedly connected with the square copper rod 21, one end of the square copper rod 21 is provided with the driven welding wheel 20, the driven welding wheel 20 can automatically rotate relative to the square copper rod 21, two ends of the sliding groove plate 19 are respectively provided with the first guide ring 16 and the second guide ring 25, the first guide ring 16 and the second guide ring 25 are connected with the sliding groove plate 19 through bolts and can be detached, the first guide ring 16 and the second guide ring 25 which are different in size can be detached according to mesh cylinders with different sizes, the first guide ring 16 and the second guide ring 25 are provided with chamfers at one end to enable the first guide cylinder to penetrate into the first guide ring 16 more easily, the second guide ring 16 is manufactured by adopting a nylon guide ring 351 mm size, the guide ring 16 and the guide ring 25 is manufactured by adopting a nylon guide ring capable of gradually limiting effect of a second guide ring, and a nylon guide ring capable of gradually acting on a second guide ring 25, and a guide ring 25 for limiting effect of a guide ring for limiting effect of a nylon guide ring for limiting effect of gradually.

The two sides of the sliding chute plate 19 are respectively provided with an upper sliding chute 17 and a lower sliding chute 18, the vertical projections of the upper sliding chute 17 and the lower sliding chute 18 are overlapped to a certain extent, the overlapping width is 3 ~ 5mm, and when the two sides of the net cylinder are respectively inserted into the upper sliding chute 17 and the lower sliding chute 18, the vertical projections of the two sides of the net cylinder are also overlapped to 3 ~ 5 mm.

Go up spout 17 and lower spout 18 and keep away from the one end of driven welding wheel 20 and have certain distance each other, conveniently leave the space of arranging the guide hole in the spout board, go up spout 17 and lower spout 18 and be close to until the coincidence gradually towards the one end of driven welding wheel 20 to the both sides of net section of thick bamboo set up respectively in last spout 17 and lower spout 18, and be close to until the superposition is in the same place on the in-process both sides that the net section of thick bamboo moved forward gradually.

One end of the sliding chute plate 19 is provided with a front tongue 22, the front tongue 22 is provided with a front tongue sliding chute 23, the front tongue sliding chute 23 is communicated with the upper sliding chute 17 and the lower sliding chute 18, and the upper sliding chute 17 and the lower sliding chute 18 are gradually overlapped and communicated at the position close to the front tongue sliding chute 23. The front tongue 22 is in a triangular structure, one corner of the front tongue 22, namely the outlet of the front tongue sliding groove 23, is arranged at a position close to the driven welding wheel 20, the straight line where the front tongue sliding groove 23 is located is tangent to the driven welding wheel 20, and when the net cylinder extends out of the front tongue sliding groove 23, the net cylinder can directly move to the driven welding wheel 20.

The end of the chute plate 19 remote from the driven welding wheel 20 is provided with a guide hole 27, the guide hole 27 passing through the inside of the chute plate 19 and being provided with a curved structure to avoid the upper and lower chutes 17 and 18. The upper end of the guide hole 27 is provided at the upper end of the chute plate 19, and the lower end of the guide hole 27 is provided at the lower end of the chute plate 19. The lower conductor bar 26 is connected to the transformer at one end and to the upper end of the chute plate 19 at the other end for fixation, and the lower conductor bar 26 passes through the guide hole 27 to the lower end of the chute plate 19 and is connected to the square copper bar 21 to form a conductive path.

The cooling device is also arranged and adopts a water cooling mode and is divided into external water cooling and internal water cooling. The external water cooling comprises a first spray head and a first water pipe, the first spray head is arranged on the square copper base 10, the first water pipe is connected with the first spray head, and the first spray head faces to the position of a welding seam outside the net cylinder; the internal water cooling comprises a second spray head and a second water pipe, wherein the second spray head is arranged on the square copper bar 21, the second water pipe penetrates from the guide hole 27 to the position below the sliding groove plate 19 and is connected with the second spray head, and the second spray head faces to the welding seam position inside the net barrel.

The insulation effect of the invention is realized by arranging the insulation board in the middle of the second mounting seat 14, the upper part and the lower part of the second mounting seat 14 are separated, and the upper part and the lower part of the second mounting seat 14 are insulated from each other; the shell does not form a loop with the upper electrode assembly 2 and the lower electrode assembly 3, so the shell has an insulating effect.

The conductive paths of the upper electrode assembly 2 are arranged as follows: the transformer, the upper conducting bar 13, the square copper seat 10 and the driving welding wheel 11, and the upper electrode assembly 2 is not insulated from the shell 1;

the conductive paths of the west electrode assembly are arranged as follows: the transformer, the lower conducting bar 26, the sliding groove plate 19, the square copper bar 21, the driven welding wheel 20, and the lower electrode assembly 3 are insulated from the shell 1.

The resistance welder provided by the invention can be used for welding the mesh and the plate.

The lower end of the shell body 1 is provided with at least two support legs, and the functions of supporting and stabilizing the shell are achieved.

The invention also provides a welding method, which comprises the following steps:

the method comprises the following steps: connecting at least two meshes end to form a mesh connecting piece;

step two: rolling the mesh sheet connecting piece into a cylinder shape to form a mesh cylinder;

step three: placing the two sides of the net drum into the upper chute 17 and the lower chute 18 respectively to insert the net drum into the workpiece guide device 15 and moving one end of the net drum above the driven welding wheel 20;

step four: the driving welding wheel 11 is pressed down until the net cylinder is tightly pressed between the driving welding wheel 11 and the driven welding wheel 20;

step five: the driving welding wheel 11 is driven to rotate through the driving shaft 12 so as to drive the net drum to move, and the net drum is electrified to be welded to form a continuous welding seam until the driving welding wheel 11 is lifted after the net drum is welded and the welding is stopped so as to finish the welding.

In the above welding method, in the step one, whether to connect the mesh sheets or what length to connect the mesh sheets is determined according to actual conditions. The mesh sheets can be connected by a welding machine.

In the welding method, in the second step, the pre-rolling of the mesh sheet can be performed by using a two-roll or three-roll winding machine, and the mesh sheet is pre-rolled to the extent that the two sides are in contact.

The welding method comprises the steps that in the third step, two sides of the net drum are respectively inserted into the upper sliding groove 17 and the lower sliding groove 18, the vertical projections of the two sides of the net drum are overlapped, the overlapped width is ~ 5mm, the net drum is easy to slip from the upper sliding groove 17 and the lower sliding groove 18 due to loose structure of the net drum, the first guide ring 16 and the second guide ring 25 are arranged on the sliding groove plate 19 and used for placing the net drum to slip, pre-setting, final setting and sizing, and the first guide ring 16 or the second guide ring 25 with different sizes can be replaced according to the net drums with different sizes in actual work.

In the welding method, in the fourth step, the driving welding wheel 11 is pressed down to be in contact with the driven welding wheel 20, and the net cylinder is tightly pressed between the driving welding wheel 11 and the driven welding wheel 20; because the straight line of the front tongue chute 23 is tangent to the driven welding wheel 20, the net cylinder cannot be deformed improperly in the welding process.

In the welding method, in the fifth step, the driving welding wheel 11 rotates clockwise, the driven welding wheel 20 rotates counterclockwise, the mesh cylinder is driven to move during the rotation of the driving welding wheel 11, and continuous welding is performed during the movement of the mesh cylinder.

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