Welding gun assembly and air cooler tube box inner longitudinal seam double gun welding machine

Abstract

The application discloses a welding gun assembly, which comprises a welding wire tube assembly, a flux tube, a connecting assembly, a sliding plate assembly and a flux distribution assembly, the welding wire tube assembly is provided with the flux tube on the side edge and is fixed by the connecting assembly, one end of the welding wire tube assembly is fixed on a welding gun frame, and the sliding plate assembly and the flux distribution assembly are fixedly arranged at the other end of the welding wire tube assembly. The air cooler tube tank inner longitudinal seam double-gun welding machine formed by the welding gun assembly comprises a front height adjusting mechanism, a front horizontal adjusting mechanism, a bed body, a balance roller device, the welding gun assembly, a rear height adjusting mechanism, a rear horizontal adjusting mechanism, a flux conveying device, a welding wire disc, a drag chain and a drag chain support, and the front height adjusting mechanism and the front horizontal adjusting mechanism are arranged on the front end of the bed body. The welding gun assembly has the advantages of reducing the welding seam repair rate, ensuring the consistency of welding quality, improving the work efficiency, reducing the labor intensity of operators, improving the production environment, being simple and convenient to operate, and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of double-gun welding machine, in particular to a welding gun assembly and a longitudinal seam double-gun welding machine in a tube box of an air cooler. BACKGROUND

[0002] In the chemical, petroleum, power, metallurgy, building material, polycrystalline silicon, waste incineration power generation and other industries, the heat exchanger air cooler is essential. The air cooler uses ambient air as the cooling medium, and the fan forces air to flow across the outside of the finned tube, so that the high-temperature process fluid in the tube is cooled or condensed. The air cooler uses air temperature rise cooling, saves valuable water resources, and can obtain air at will, without site restrictions. The air has low corrosion and the equipment has a long service life.

[0003] The tube box is a main component of the air cooler, and the manufacturing quality of the tube box is crucial to the air cooler and directly affects the service life of the air cooler. The traditional production equipment mainly has the following problems: the tube box is heavy, it is not too convenient to adjust the tube box, and the adjustment time is long; the distance between the two welding guns needs to be adjusted when the tube box width is different, the welding gun connecting assembly is not convenient to adjust, the adjustment time is long; the welding is prone to deformation, and the efficiency is low; the welding gun is long, and the welding gun droops due to its own weight. SUMMARY

[0004] The present application mainly adopts a fixed tube box, and the height of the welding gun can be adjusted when welding at different positions of the tube box, avoiding the trouble of oil pollution caused by using a hydraulic station. The problems of the background art are solved, including the heavy weight of the tube box, the inconvenience of adjusting the tube box, the long adjustment time, the need to adjust the distance between the two welding guns when the tube box width is different, the inconvenience of adjusting the welding gun connecting assembly, the long adjustment time, the welding deformation, the low efficiency, and the long welding gun drooping due to its own weight.

[0005] The technical scheme provided by the present application is as follows:

[0006] The welding gun assembly comprises a welding wire pipe assembly, a flux pipe, a connecting assembly, a sliding plate assembly and a flux distribution assembly. The welding wire pipe assembly is provided with the flux pipe on the side edge and is fixed by the connecting assembly. One end of the welding wire pipe assembly is fixed on the welding gun holder, and the other end of the welding wire pipe assembly is fixedly provided with the sliding plate assembly and the flux distribution assembly. The welding gun assembly is mainly used for welding and conveying flux in the deep tube box. The width of the welding gun assembly can be adjusted according to the width of the workpiece cavity to adapt to different workpieces. The sliding assembly, as a tool, needs to be made into different sizes according to different workpieces.

[0007] As a further technical scheme, the welding wire pipe assembly and the flux pipe are arranged side by side.

[0008] As a further technical scheme, the welding wire pipe assembly is arranged symmetrically side by side.

[0009] As a further technical solution, the welding gun assembly comprises two groups of welding wire pipe assemblies and flux pipes, each group of welding wire pipe assembly and flux pipe is fixed together through the pressing plate one and the pressing plate two; the dovetail block connects the two groups of welding wire pipe assemblies and flux pipes together, the two welding wire pipe assemblies are on the outside, and the two flux pipes are arranged in the middle; the two welding wire pipe assemblies and the two flux pipes are arranged side by side and are fixed together by at least two groups of connecting assemblies; one end of the welding wire pipe assembly is fixed on the two welding gun racks, and the other end is fixedly provided with a sliding plate assembly and a flux distribution assembly; the welding wire pipe assembly guides the welding wire from the wire feeder to the wire guide nozzle.

[0010] As a further technical solution, the connecting assembly is divided into at least two groups, preferably three groups. The segmented arrangement of the connecting assembly can better fix the welding wire pipe assembly and the flux pipe, so that the fixing force is uniform.

[0011] As a further technical solution, the welding wire pipe assembly comprises a wire guide head, a fixed flange, a conductive block one, a conductive terminal, an insulating block one, a welding wire pipe outer pipe, an insulating pipe, a conductive pipe, a wire guide pipe, an insulating block two, a conductive block two, an insulating block, a guide block and a wire guide nozzle; one end of the wire guide head is inserted into the wire outlet of the wire feeder, the other end is inserted into the fixed flange, and the fixed flange is fixed on the wire feeder; the fixed flange is provided with a conductive block one at the rear end, one end of the conductive block one is screwed with the outer thread of the conductive pipe, and the other end is provided with a conductive terminal for fixing the conductive cable; the rear end of the conductive block one is provided with an insulating block one for isolating the connection between the conductive block one, the conductive pipe and the welding wire pipe outer pipe, so that no current passes through the welding wire pipe outer pipe during welding; the front end of the insulating block two is inserted into the rear end of the welding wire pipe outer pipe; the insulating pipe is inserted into the middle of the welding wire pipe outer pipe, and the two ends are respectively inserted into the rear end of the insulating block one and the front end of the insulating block two; the insulating block one, the insulating pipe and the insulating block two ensure that the welding wire pipe outer pipe is in an insulating state; the rear end of the insulating block two is connected with the conductive block two, one end of the conductive block two is connected with the conductive pipe, and the other end of the conductive block two is fixedly provided with a wire guide nozzle; a fixed insulating block is arranged at the bottom of the conductive block two; the guide block is fixedly arranged on the side surface of the insulating block, and the insulating block is used to ensure that the conductive block two and the guide block and the sliding plate assembly are insulated; the inner layer of the welding wire pipe outer pipe is provided with an insulating pipe, the inner layer of the insulating pipe is provided with a conductive pipe, and the inner layer of the conductive pipe is provided with a wire guide pipe; the two ends of the conductive pipe are respectively connected with the conductive block one and the conductive block two by screw connection, and are used for reliable conduction of welding current; the wire guide pipe is used for smooth wire feeding during welding, and reduces the wear of the conductive pipe; one end of the wire guide nozzle is inserted into the conductive block two and is fixed by a wire guide, and the wire guide can be loosened to adjust the angle between the wire guide nozzle and the workpiece to be welded.

[0012] As a further technical solution, the conductive terminal is a conductive bolt. Or a copper bolt, used for fixing the welding cable.

[0013] As a further technical solution, more preferably, the conductive bolt is a copper bolt.

[0014] As a further technical solution, the welding wire tube outer tube is a steel tube.

[0015] As a further technical solution, the conductive tube is a copper tube, and both ends are provided with threads and are connected with the conductive block one and the conductive block two respectively.

[0016] As a further technical solution, the wire guide nozzle is bent from a copper tube, has a certain angle, and has a middle circular arc transition.

[0017] As a further technical solution, the connecting assembly includes a pressing plate one, a pressing plate two, a dovetail block, and a jackscrew; the pressing plate one is provided with a dovetail groove on the upper part and a semicircular hole on the lower part; the pressing plate two is provided with a semicircular hole on the upper part and forms a whole circle with the semicircular hole on the lower part of the pressing plate one, and is used for fixing the welding wire tube outer tube and the flux tube; the dovetail block has a dovetail cross section, can be inserted into the dovetail groove on the upper part of the pressing plate one, and is fixed together with the pressing plate one on both sides through the jackscrew; the depth of the dovetail block in the dovetail groove on the upper part of the pressing plate one can be adjusted by loosening the jackscrew, so as to adjust the width of the welding gun assembly to adapt to workpieces of different sizes; and the connecting assembly is used for fixing the welding wire tube assembly and the flux tube together, and the width can be adjusted according to the specifications of the workpieces to adapt to workpieces of different specifications.

[0018] As a further technical solution, the sliding plate assembly includes a sliding plate, a bottom plate, and an upper pressing plate; the bottom plate is fixed at one end of the sliding plate, and the upper part of the bottom plate is two semicircles that form a whole circle with the two semicircles on the lower part of the upper pressing plate and are fixed at one end of the welding wire tube assembly; the sliding plate assembly slides on the partition plate in the workpiece together with the welding wire tube assembly during welding to complete the welding of the weld. The sliding plate assembly is fixed at one end close to the wire guide tube and can slide on the partition plate in the workpiece during welding.

[0019] As a further technical solution, the flux distribution assembly includes a concave plate, an upper plate, and a lower plate; the upper plate and the lower plate are clamped to the flux tube through screws, and the upper plate and the lower plate are fixed to the concave plate through screws; the flux is transported from the two flux tubes to the inner wall of the concave plate through pressure, and then flows to the two sides of the to-be-welded area to prepare for welding. The transported flux has a certain pressure, is sprayed into the middle of the concave plate, and is discharged to the two sides, so that the flux covers the weld position. The flux distribution assembly is mainly used for distributing the flux to the weld positions on the two sides.

[0020] The welding wire pipe outer tube is a bearing body of the welding wire pipe assembly, the insulating tube, the conductive tube and the welding wire pass through the hole of the welding wire pipe outer tube, the guide wire pipe is arranged in the conductive tube and is mainly used for guiding and wearing of the welding wire. The insulating block two is mainly used for insulating the connection between the conductive block two and the welding wire pipe outer tube, so that the welding wire pipe outer tube is in an insulating state. The insulating block is used for insulating the conductive block two and the sliding plate assembly, so that the sliding plate assembly is in an insulating state. The guide block is fixedly arranged on the side surface of the insulating block and is used for guiding in the welding process of the workpiece, one side of the guide block is coincident with the surface of the insulating block, and the other side is in contact with the inner side of the workpiece and slides, so as to play a guiding role. The guide wire nozzle is inserted into the guide block two and is bent from the copper pipe, has a certain angle and a middle arc transition, and guarantees good conduction of the welding wire. The welding wire pipe assembly is mainly used for conveying and conducting of the welding wire. The insulating tube is used for insulating the whole conductive tube and the welding wire pipe outer tube, so as to guarantee that no current passes through the welding wire pipe outer tube. The conductive tube is mainly used for conducting in the welding process and is made of copper pipe, and threads are arranged at two ends of the conductive tube and are connected with the conductive block one and the conductive block two respectively.

[0021] The flux pipe is connected with a flux conveying device at one end and is provided with a fixed flux distribution assembly at the other end, and the flux pipe is used for conveying the flux.

[0022] The air cooler pipe box longitudinal seam double-gun welding machine comprises a front height adjusting mechanism, a front horizontal adjusting mechanism, a bed body, a balance roller device, a welding gun assembly, a rear height adjusting mechanism, a rear horizontal adjusting mechanism, a flux conveying device, a welding wire disc, a drag chain and a drag chain support, the front end of the bed body is provided with the front height adjusting mechanism and the front horizontal adjusting mechanism, the bed body is further provided with the balance roller device, the front edge of the moving trolley of the bed body is provided with the rear height adjusting mechanism and the rear horizontal adjusting mechanism, the two side edges of the moving trolley are provided with the flux conveying device, the rear edge of the moving trolley is provided with the welding wire disc, the side edge of the bed body is provided with the drag chain, and one end of the drag chain is fixed on the moving trolley through a screw and moves together with the moving trolley.

[0023] As a further technical scheme, the front height adjusting mechanism comprises a first support, a first linear guide rail, a first guide rail sliding block, a first sliding plate, a first screw rod pair, a support plate, a coupling, a first motor base, a first lifting motor, a nut seat and a first bearing seat, the first support is fixed at the front end of the bed body, the first sliding plate is connected through the first linear guide rail, the first guide rail sliding block and the first support, and slides along the first linear guide rail; the nut of the first screw rod pair is fixed on the nut seat, the nut seat and the back of the first sliding plate are fixed, one end of the screw rod of the first screw rod pair is fixed on the first bearing seat, is connected with the shaft of the first lifting motor through the coupling, and the first lifting motor is connected with the first support through the first motor base; the first lifting motor drives the first sliding plate to move up and down by driving the first screw rod pair.

[0024] The support plate is fixed on the back of the first sliding plate, mainly used for supporting the front end of the welding gun assembly, and supporting the sliding plate of the sliding plate assembly before the welding gun enters the inner cavity of the workpiece.

[0025] As a further technical solution, the front height adjusting mechanism is fixed on one end of the bed body, mainly used for adjusting the position of the welding gun assembly in the height direction, so as to weld the inner weld on different partitions of the workpiece, and make the welding gun at the ideal welding height.

[0026] As a further technical solution, the front horizontal adjusting mechanism includes a second support, a second linear guide rail, a second guide rail slider, a second sliding plate, a second screw pair, a second bearing seat, a first hand wheel, a guide plate and a scale; one side of the second sliding plate is fixed with the first sliding plate of the front height adjusting mechanism and rises and falls together; the other side of the second sliding plate is provided with a fixed second guide rail slider, and the second guide rail slider and the second linear guide rail are in sliding fit; the second linear guide rail is fixed on the second support, and the second support can move along the direction of the second linear guide rail; the second screw pair nut is fixed on the back of the second sliding plate, one end of the second screw pair screw rod is fixed on the second bearing seat through a bearing, and the second bearing seat is fixed on the end of the second support; the first hand wheel is connected to the end of the screw rod of the second screw pair through a key; rotating the first hand wheel realizes horizontal adjustment of the second support through the second screw pair, adjusts the alignment of the welding gun assembly to the inner cavity of the workpiece, and adjusts the interval of the two guide plates on the back of the second support, so that they are consistent with the width of the inner cavity of the workpiece; the scale is fixed on the edge of the back of the second support, and is used for adjusting the interval of the two guide plates.

[0027] As a further technical solution, the bed body includes a bed body, a linear guide rail, a guide rail slider, a moving trolley, a rack, a gear and a driving reduction motor, two linear guide rails are fixedly arranged on the upper edge of the bed body, four guide rail sliders are arranged on each linear guide rail, and the moving trolley is connected with the bed body through two linear guide rail sliders on each linear guide rail; the balance roller device is connected with the bed body through the other two guide rail sliders on each linear guide rail and can move along the guide rail direction; the rack is fixedly arranged on the bed body and is in engagement with the gear; the driving reduction motor is fixed on the upper edge of the moving trolley, the gear is fixed on the output shaft end of the driving reduction motor through a key, and the moving trolley moves along the linear guide rail direction through the gear and the rack to realize welding; the rear height adjusting mechanism is fixedly arranged on the front edge of the moving trolley, the welding agent conveying device is fixedly arranged on the left and right sides, and the welding wire reel is fixedly arranged on the upper rear part. The bed body is fixed to the ground after horizontal adjustment according to requirements, and is used for carrying various components.

[0028] As a further technical solution, the balance roller device includes a third support, a third linear guide rail, a third guide rail slider, a support assembly, a counterweight, a steel wire rope and a pulley block.

[0029] The third support lower edge is fixed by a linear guide rail, a guide rail slider and a bed body, and can move forward and backward along the linear guide rail direction; the third linear guide rail and the third guide rail slider are symmetrically arranged and fixed on the front edge of the third support; the support assembly is fixed on the front edge of the third support through the third linear guide rail and the third guide rail slider, and can move up and down along the third linear guide rail; the pulley set is symmetrically arranged and fixed on the upper edge of the third support; the steel wire rope passes through the pulley set, one end of which is connected to the upper end of the support assembly, and the other end is connected with a counterweight; the welding gun assembly is placed on the rollers of the support assembly, and part of the gravity of the welding gun assembly is balanced by the counterweight; the support assembly comprises a roller support and a roller, the two roller supports are symmetrically fixed on the third guide rail slider, and the roller is connected with the two roller supports through a bearing; the balance roller device moves forward by pulling the chain support through a drag chain, so that the balance roller device can move with the movement of the moving trolley; one end of the drag chain is fixed on the moving trolley, the other end is fixed at the middle position of the moving trolley, the middle passes through the chain support, and the chain support is fixed on the side of the third support; when the moving trolley moves, the drag chain moves, the drag chain drives the chain support to move, thereby driving the movement of the balance roller device.

[0030] The steel wire rope has a pulling force on the support assembly under the gravity of the counterweight, thereby avoiding the drooping of the welding gun assembly caused by its own gravity, that is, the support assembly, the welding gun assembly and the counterweight are balanced.

[0031] As a further technical solution, the rear horizontal adjustment mechanism comprises a fourth support, a fourth linear guide rail, a fourth guide rail slider, a large slide plate, a fourth screw pair, a fourth bearing seat, a second hand wheel, a small slide plate, a pressing plate, a locking wrench, a locking pressing block, a welding gun holder and a wire feeder. The fourth support is fixed on the back of the fifth slide plate and moves up and down with the fifth slide plate. The large slide plate is connected through the fourth linear guide rail, the fourth guide rail slider and the fourth support. The fourth screw pair nut is connected with the back of the large slide plate. One end of the fourth screw pair is fixed on the fourth bearing seat, and the fourth bearing seat is fixed on the end of the fifth slide plate. The second hand wheel is fixed on the end of the fourth screw pair through a key. Rotating the second hand wheel drives the large slide plate to move left and right along the fourth linear guide rail, so as to realize the left and right adjustment of the welding gun assembly. The two small slide plates are fixed on the left and right sides of the front edge of the large slide plate. The small slide plate is fixed in the groove of the large slide plate through the pressing plate. The small slide plate and the large slide plate groove, the pressing plate are clearance fit, and the small slide plate can move left and right in the groove of the large slide plate. Rotating the locking wrench can adjust the locking pressing block to lock the small slide plate, and the position is fixed after adjustment. The welding gun holder and the wire feeder are fixed on the upper side of the small slide plate. Adjusting the relative position of the two small slide plates is to adjust the width of the welding gun assembly. After adjusting the position according to the inner cavity of the workpiece, the locking pressing block is fixed. The two small slide blocks correspond to the two guide plates, and the width of the welding gun assembly is adjusted. After adjusting the width, the welding gun assembly is aligned with the position of the inner cavity of the workpiece by adjusting the position of the second support and the large slide plate.

[0032] The rear height adjustment mechanism comprises a fifth support, a fifth linear guide rail, a fifth guide rail slider, a fifth slide plate, a fifth screw pair, a second motor seat, a fifth bearing seat, a coupling and a second lifting motor. The fifth support is fixed on the front edge of the mobile trolley and moves with the mobile trolley. The fifth slide plate is connected through the fifth linear guide rail, the fourth guide rail slider and the fifth support, and can slide along the fifth linear guide rail. The fifth screw pair nut is fixed on the back of the fifth slide plate, and the fifth screw pair is fixed on the fifth bearing seat through the coupling and the second lifting motor. The second lifting motor is fixed on the fifth support through the second motor seat. The second lifting motor drives the fifth slide plate to realize lifting movement through the fifth screw pair. The rear height adjustment mechanism is mainly used for adjusting the height of the welding gun assembly, and the height position of the welding gun assembly is adjusted together with the front height adjustment mechanism.

[0033] As a further technical solution, one end of the drag chain is fixed on the mobile trolley, the other end is fixed on the middle position of the travel of the mobile trolley, the middle passes through the drag chain support, and the drag chain support is fixed on the side of the third support. When the mobile trolley moves, it pushes the drag chain to move, and the drag chain drives the drag chain support to move, thereby pushing the balance roller device to move.

[0034] Compared with the prior art, the present application has the advantages and positive effects that: the pipe box is fixed, the height of the welding gun is adjusted when welding at different positions of the pipe box, and the trouble of oil pollution caused by using a hydraulic station is avoided; a special welding gun connecting assembly is designed, which is more convenient and fast to adjust the distance of the welding gun; a special double-gun welding assembly is designed, symmetrical welding is adopted, deformation is effectively controlled to ensure the welding quality, and the welding efficiency is improved; a balance roller device is added, which has simple and compact structure. The pipe box production process is more reasonable, after assembling and fixing, symmetrical double-gun welding is adopted, welding deformation is controlled, the welding repair rate is reduced, the consistency of the welding quality is ensured, the work efficiency is improved, the labor intensity of the operator is reduced, the production environment is improved, and the operation is simple and convenient BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a side view of the double-gun welding machine of the present application,

[0036] Figure 2 is a top view of the double-gun welding machine of the present application,

[0037] Figure 3 is a schematic view of the inner weld of the workpiece 1,

[0038] Figure 4 is a front view of the front height adjusting mechanism 3,

[0039] Figure 5 is a side view of the front height adjusting mechanism 3;

[0040] Figure 6 is a side view of the front horizontal adjusting mechanism 4,

[0041] Figure 7 is a top view of the front horizontal adjusting mechanism 4,

[0042] Figure 8 is a front view of the bed body 5,

[0043] Figure 9 is a left view of the bed body 5,

[0044] Figure 10 is a front view of the balance roller device 6,

[0045] Figure 11 is a side view of the balance roller device 6,

[0046] Figure 12 is a sectional view of the balance roller device 6,

[0047] Figure 13 is a front view of the welding gun assembly 7,

[0048] Figure 14 is a top view of the welding gun assembly 7,

[0049] Figure 15is a front view of the welding wire tube assembly 71,

[0050] Figure 16 is a cross-sectional view of the welding wire tube assembly 71,

[0051] Figure 17 is Figure 15 A-A cross-sectional view,

[0052] Figure 18 is Figure 15 B-B cross-sectional view,

[0053] Figure 19 is a front view of the coupling assembly 73,

[0054] Figure 20 is a top view of the coupling assembly 73,

[0055] Figure 21 is a front view of the slide plate assembly 74,

[0056] Figure 22 is a cross-sectional view of the slide plate assembly 74,

[0057] Figure 23 is a front view of the flux dispensing assembly 75,

[0058] Figure 24 is Figure 23 C-C cross-sectional view,

[0059] Figure 25 is a side view of the flux dispensing assembly 75,

[0060] Figure 26 is a rear horizontal adjustment mechanism 8 Figure 23 D-D cross-sectional view,

[0061] Figure 27 is a top view of the rear horizontal adjustment mechanism 8,

[0062] Figure 28 is a left view of the rear horizontal adjustment mechanism 8,

[0063] Figure 29 is a right view of the rear height adjustment mechanism 9,

[0064] Figure 30 is a front view of the rear height adjustment mechanism 9,

[0065] In the figure: 1 is the workpiece, 2 is the workpiece support, 3 is the front height adjustment mechanism, 4 is the front horizontal adjustment mechanism, 5 is the bed body, 6 is the balance roller device, 7 is the welding gun assembly, 8 is the rear height adjustment mechanism, 9 is the rear horizontal adjustment mechanism, 10 is the flux conveying device, 11 is the welding wire reel, 12 is the drag chain, 13 is the drag chain support, 101, 102, 103 are the inner weld, 21 is the table top, 22 is the leg, 31 is the first support, 32 is the first linear guide rail, 33 is the first guide rail slider, 34 is the first sliding plate, 35 is the first screw rod pair, 36 is the support plate, 37 is the coupling, 38 is the first motor seat, 39 is the first lifting motor, 310 nut seat, 311 first bearing seat, 41 is the second support, 42 is the second linear guide rail, 43 is the second guide rail slider, 44 is the second sliding plate, 45 is the second screw rod pair, 46 is the second bearing seat, 47 is the first hand wheel, 48 is the guide plate, 49 is the scale, 51 is the bed body, 52 is the third linear guide rail, 53 is the third guide rail slider, 54 is the moving trolley, 55 is the rack, 56 is the gear, 57 is the driving reduction motor, 61 is the third support, 62 is the third linear guide rail, 63 is the third guide rail slider, 64 is the support assembly, 641 is the roller support, 642 is the roller, 65 is the counterweight, 66 is the steel wire rope, 67 is the pulley block, 71 is the welding wire tube assembly, 72 is the flux tube, 73 is the coupling assembly, 74 is the sliding plate assembly, 75 is the flux distribution assembly, 711 is the wire guide head, 712 is the fixed flange, 713 is the conductive block one, 714 is the conductive terminal, 715 is the insulating block one, 716 is the welding wire tube outer tube, 717 is the insulating tube, 718 is the conductive tube, 719 is the wire guide tube, 720 is the insulating block two, 721 is the conductive block two, 722 is the insulating block, 723 is the guide block, 724 is the wire guide nozzle, 731 is the pressing plate one, 732 is the pressing plate two, 733 is the dovetail block, 734 is the jacking screw, 741 is the sliding plate, 742 is the bottom plate, 743 is the upper pressing plate, 751 is the concave plate, 752 is the upper plate, 753 is the lower plate, 81 is the fourth support, 82 is the fourth linear guide rail, 83 is the fourth guide rail slider, 84 is the large sliding plate, 85 is the fourth screw rod pair, 86 is the fourth bearing seat, 87 is the second hand wheel, 88 is the small sliding plate, 89 is the pressing plate, 810 is the locking wrench, 811 is the locking pressing block, 812 is the welding gun holder, 813 is the wire feeder, 91 is the fifth support, 92 is the fifth linear guide rail, 93 is the fifth guide rail slider, 94 is the fifth sliding plate, 95 is the fifth screw rod pair, 96 is the second motor seat, 97 is the fifth bearing seat, 98 is the coupling, 99 is the second lifting motor. DETAILED DESCRIPTION

[0066] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0067] With reference to Figures 1-30 The present application provides the detailed technical solutions as follows:

[0068] Figure 1 The side view of the double-gun welding machine: the longitudinal seam double-gun welding machine in the air cooler pipe box mainly comprises a workpiece 1, a workpiece support 2, a front height adjusting mechanism 3, a front horizontal adjusting mechanism 4, a bed body 5, a balance roller device 6, a welding gun assembly 7, a rear height adjusting mechanism 8, a rear horizontal adjusting mechanism 9, a flux conveying device 10, a welding wire disc 11, a drag chain 12, a drag chain support 13,

[0069] Figure 2 The top view of the double-gun welding machine, Figure 3 The schematic view of the weld in the workpiece 1,

[0070] The weld 101, 102, 103 in the workpiece 1 and the corresponding welds below.

[0071] The workpiece support 2 is mainly used for supporting the workpiece 1 and comprises a table top 21 and a supporting leg 22. After the workpiece support 2 is adjusted to be horizontal, it is fixedly connected with the ground. The workpiece 1 is hoisted and fixed on the workpiece support 2 and waits for welding.

[0072] Figure 4 The front height adjusting mechanism 3 front view, Figure 5 is the front height adjusting mechanism 3 side view;

[0073] The front height adjusting mechanism 3 is fixed on one end of the bed 5, and is mainly used for adjusting the position of the welding gun assembly 7 in the height direction to weld the inner welds on different partitions of the workpiece 1, from the inner weld 103 to the inner weld 101, so that the welding gun is at the ideal welding height. The front height adjusting mechanism 3 mainly comprises a first support 31, a first linear guide rail 32, a first guide rail sliding block 33, a first sliding plate 34, a first screw rod pair 35, a support plate 36, a coupling 37, a first motor base 38, a first lifting motor 39, a nut seat 310, and a first bearing seat 311. The first support 31 is fixed on the front end of the bed 5. The first sliding plate 34 is connected with the first support 31 through the first linear guide rail 32 and the first guide rail sliding block 33, and can slide along the first linear guide rail 32. The nut of the first screw rod pair 35 is fixed on the nut seat 310, and the nut seat 310 is fixed on the back of the first sliding plate 34. One end of the screw rod of the first screw rod pair 35 is fixed on the first bearing seat 311, and is connected with the shaft of the first lifting motor 39 through the coupling 37. The first lifting motor 39 is connected with the first support 31 through the first motor base 38. The first lifting motor 39 drives the first screw rod pair 35 to drive the first sliding plate 34 to move up and down. The support plate 36 is fixed on the back of the first sliding plate 34, and is mainly used for supporting the front end of the welding gun assembly 7. Before the welding gun enters the inner cavity of the workpiece 1, the sliding plate 741 of the sliding plate assembly 74 is supported.

[0074] Figure 6 FIG. 4 is a side view of the front horizontal adjusting mechanism 4, Figure 7 FIG. 5 is a top view of the front horizontal adjusting mechanism 4,

[0075] The front horizontal adjusting mechanism 4 is fixed on the front of the first sliding plate 34, and moves up and down with the first sliding plate 34. The second support 41 can be adjusted in position left and right by using the first hand wheel 47. The front horizontal adjusting mechanism 4 is mainly used for adjusting the position of the welding gun before the welding gun enters the inner cavity of the workpiece 1, aligning the welding gun with the inner cavity of the workpiece 1, and making the welding gun enter smoothly. The front horizontal adjusting mechanism 4 comprises a second support 41, a second linear guide rail 42, a second guide rail sliding block 43, a second sliding plate 44, a second screw rod pair 45, a second bearing seat 46, a first hand wheel 47, a guide plate 48, and a scale 49. The side edge of the second sliding plate 44 is fixed with the first sliding plate 34, and the upper surface is fixed with the second support 41 through the second linear guide rail 42 and the second guide rail sliding block 43. The nut of the second screw rod pair 45 is fixed on the second sliding plate 44, and the screw rod of the second screw rod pair 45 is fixed on the second bearing seat 46 through a bearing. The first hand wheel 47 is connected with the end of the screw rod through a key. When the first hand wheel 47 is rotated, the second screw rod pair 45 drives the second linear guide rail 42 on the second support 41 to slide on the second guide rail sliding block 43. Two guide plates 48 are fixed on the back of the second support 41, which can make the welding gun assembly 7 enter the inner cavity of the workpiece 1 smoothly. The positions and distances of the two guide plates 48 can be adjusted according to the specifications and sizes of the inner cavity of the workpiece 1, and are locked after adjustment. The scale is fixed on the back of the second support 41, which facilitates the adjustment of the two guide plates 48.

[0076] Figure 8 is the front view of the bed body 5, Figure 9 is the left view of the bed body 5,

[0077] After the bed body 5 is adjusted horizontally as required and fixed to the ground, it is used to carry various components; mainly including a bed body 51, a linear guide rail 52, a guide rail sliding block 53, a moving trolley 54, a rack 55, a gear 56, a driving reduction motor 57, two linear guide rails 52 are fixedly arranged on the upper edge of the bed body 51, four guide rail sliding blocks 53 are arranged on each linear guide rail 52, the moving trolley 54 is connected with the bed body 51 through two guide rail sliding blocks 53 on each linear guide rail; the balance roller device 6 is connected with the bed body 51 through the other two guide rail sliding blocks 53 on each linear guide rail 52 and can move along the guide rail direction; the rack 55 is fixedly arranged in parallel with the linear guide rail, and the gear 56 is engaged with the rack 55; the driving reduction motor 57 is fixed on the upper edge of the moving trolley 54, the gear 56 is fixed on the output shaft end through a key, and the moving trolley 54 is driven to move along the linear guide rail 52 direction through the gear and rack drive, so as to realize the welding completion; the rear height adjusting mechanism 9 is fixedly arranged on the front edge of the moving trolley 54, and the fixed flux conveying device 10 is arranged on the left and right sides, and the welding wire disc 11 is fixedly arranged on the upper rear part.

[0078] Figure 10 is the front view of the balance roller device 6, Figure 11 is the side view of the balance roller device 6, Figure 12 is the sectional view of the balance roller device 6,

[0079] The balance roller device 6 is mainly used to support the welding gun assembly 7, so as to avoid the welding gun assembly 7 from drooping in the middle due to being too long, thereby causing unstable welding quality; mainly including a third support 61, a third linear guide rail 62, a third guide rail sliding block 63, a supporting assembly 64, a counterweight 65, a steel wire rope 66 and a pulley block 67, the lower end of the third support 61 is connected with the bed body 51 through the linear guide rail 52 and the guide rail sliding block 53; one pulley block 67 is arranged on each of the left and right sides of the upper edge of the third support 61, the steel wire rope 66 is wound around the pulley block 67, one end of the steel wire rope 66 is connected with the upper end of the supporting assembly 64, and the other end of the steel wire rope 66 is connected with the counterweight 65; the supporting assembly 64 is connected with the third support 61 through the third linear guide rail 62 and the third guide rail sliding block 63 and can move up and down along the third linear guide rail 62; the welding gun assembly 7 is placed on the roller 642 of the supporting assembly 64, and the supporting assembly 64 has a pulling force under the gravity of the counterweight 65, so as to avoid the drooping of the welding gun assembly 7 caused by its own gravity, that is, the balance between the supporting assembly 64, the welding gun assembly 7 and the counterweight 65 is achieved; the supporting assembly 64 includes a roller support 641 and a roller 642, and the roller 642 is fixed on the two roller supports 641 through bearings; the third support 61 is fixedly arranged with a drag chain support 13 on the side surface, the drag chain support 13 is moved forward by moving the drag chain 12, so that the balance roller device 6 can move with the movement of the moving trolley 54.

[0080] Figure 13 is the front view of the welding gun assembly 7, Figure 14 is the top view of the welding gun assembly 7,

[0081] The welding gun assembly 7 is mainly used for moving inside the pipe box to complete the delivery of the flux and the welding of the inner longitudinal seam; it includes two welding wire pipe assemblies 71, flux pipes 72, connecting assemblies 73, sliding plate assemblies 74, and flux distribution assemblies 75, two flux pipes 72 are arranged between the two welding wire pipe assemblies 71, the four pipes are placed side by side and are fixed together by three groups of connecting assemblies 73, one end is fixed on the welding gun holder 812, and the other end is fixedly arranged with the sliding plate assembly 74 and the flux distribution assembly 75.

[0082] Figure 15 is the front view of the welding wire pipe assembly 71, Figure 16 is the sectional view of the welding wire pipe assembly 71, Figure 17 is Figure 15 A-A sectional view, Figure 18 is Figure 15B-B is a cross-sectional view of the welding wire tube assembly 71, which is mainly used for the delivery and conduction of welding wire, and includes a wire guide head 711, a fixed flange 712, a conducting block one 713, a conducting terminal 714, an insulation block one 715, a welding wire tube outer tube 716, an insulation tube 717, a conducting tube 718, a wire guide tube 719, an insulation block two 720, a conducting block two 721, an insulation block 722, a guide block 723, and a wire guide nozzle 724. The wire guide head 711 is inserted into the wire delivery device 813 at one end and into the fixed flange 712 at the other end, and is fixed to the wire delivery device 813 through the fixed flange. The conducting block one 713 is screwed at one end through an internal thread and an external thread of the conducting tube 718, and is provided with the conducting terminal 714 at the other end, which is used for fixing the conducting cable. The insulation block one 715 is used to separate the conducting block one 713, the conducting tube 718, and the welding wire tube outer tube 716, so that no current passes through the welding wire tube outer tube 716 during welding. The welding wire tube outer tube 716 is a carrier of the welding wire tube assembly 71, through which the insulation tube 717, the conducting tube 718, the wire guide tube 719, and the welding wire pass. The insulation tube 717 is used to insulate the conducting tube 718 and the welding wire tube outer tube 716, so as to ensure that no current passes through the welding wire tube outer tube 716. The conducting tube 718 is mainly used for conduction during welding, and is made of copper pipe, which is provided with threads at both ends and is connected to the conducting block one 713 and the conducting block two 721, respectively. The wire guide tube 719 is arranged in the conducting tube 718 and is mainly used for guiding the welding wire and is wear-resistant. The insulation block two 720 is mainly used to insulate the conducting block two 721 and the welding wire tube outer tube 716, so that the welding wire tube outer tube 716 is in an insulating state. The conducting block two 721 is connected to the conducting tube 718 at one end and is fixedly provided with the wire guide nozzle 724 at the other end, and is provided with the fixed insulation block 722 at the bottom, which is used to separate the conducting block two 721 and the sliding plate assembly 74, so that the sliding plate assembly 74 is in an insulating state. The guide block 723 is fixedly arranged on the side of the insulation block 722 and is used for guiding during welding in the workpiece 1, and one side of the guide block 723 coincides with the side of the insulation block 722, and the other side contacts and slides with the inner side of the workpiece 1, thereby playing a guiding role. The wire guide nozzle 724 is inserted into the guide block two 720 and is made of a copper pipe, which is bent at a certain angle and has a middle arc transition, so as to ensure good conduction of the welding wire.

[0083] The flux tube 72 is used for the delivery of flux, one end of which is connected to a flux delivery device, and the other end is provided with a fixed flux distribution assembly 75.

[0084] Figure 19 FIG. 1 is a front view of the connecting assembly 73, Figure 20 FIG. 2 is a top view of the connecting assembly 73,

[0085] The connecting assembly 73 is used to fix the welding wire tube assembly 71 and the flux tube 72 together, and can be adjusted in width according to the specifications of the workpiece to adapt to different specifications of the workpiece, including the first pressing plate 731, the second pressing plate 732, the dovetail block 733, and the top screw 734; the first pressing plate 731 is provided with a dovetail groove at the upper portion and a semicircular hole at the lower portion; the second pressing plate 732 is provided with a semicircular hole at the upper portion, and the first pressing plate 731 and the second pressing plate 732 are clamped on the welding wire tube assembly 71 and the flux tube 72 by screws, one set on the left and one set on the right; the dovetail block 733 is in the shape of a dovetail, which can be inserted into the dovetail groove at the upper edge of the first pressing plate 731; the top screw 734 on the dovetail block 733 can be tightened to connect the left and right sets of welding wire tube assemblies 71 and flux tubes 72 together, and loosening the top screw 734 can adjust the distance between the two sets of welding wire tube assemblies 71 and flux tubes 72.

[0086] Figure 21 is the front view of the sliding plate assembly 74, Figure 22 is the sectional view of the sliding plate assembly 74,

[0087] The sliding plate assembly 74 is fixed to one end of the welding wire tube assembly 71 close to the wire guide nozzle 724, and can slide on the inner partition of the workpiece 1 during welding, including the sliding plate 741, the bottom plate 742, and the upper pressing plate 743; one end of the sliding plate 741 is fixedly welded to the bottom of the bottom plate 742, and the upper portion of the bottom plate 742 is two semicircles that form a complete circle with the two semicircles at the lower portion of the upper pressing plate 743 and are fixed to one end of the welding wire tube assembly 71 close to the wire guide nozzle 724; during welding, the sliding plate assembly 74 slides on the inner partition of the workpiece together with the welding wire tube assembly 71 to complete the welding of the weld.

[0088] Figure 23 is the front view of the flux distribution assembly 75, Figure 24 is Figure 23 C-C sectional view, Figure 25 is Figure 23 D-D sectional view;

[0089] The flux distribution assembly 75 is mainly used to distribute flux to both sides of the weld position, including the concave plate 751, the upper plate 752, and the lower plate 753; the upper plate 752 and the lower plate 753 are clamped to the flux tube 71 by screws, and the concave plate 751 is fixed to the upper plate 752 by screws; the flux is transported from the two flux tubes 72 to the inner wall of the concave plate 751 under pressure, and flows to the two sides of the to-be-welded area under the action of pressure to prepare for welding.

[0090] Figure 26 is the front view of the rear horizontal adjustment mechanism 8, Figure 27 is the top view of the rear horizontal adjustment mechanism 8, Figure 28 is the left view of the rear horizontal adjustment mechanism 8;

[0091] The rear horizontal adjustment mechanism 8 is mainly used for adjusting the width of the welding gun assembly 7 and the left and right positions of the welding gun assembly 7, and adjusts the left and right positions of the welding gun assembly 7 together with the front horizontal adjustment mechanism 4; the rear horizontal adjustment mechanism 8 comprises a fourth support 81, a fourth linear guide rail 82, a fourth guide rail sliding block 83, a large sliding plate 84, a fourth screw pair 85, a fourth bearing seat 86, a second hand wheel 87, a small sliding plate 88, a pressing plate 89, a locking wrench 810, a locking pressing block 811, a welding gun holder 812 and a wire feeder 813, the fourth support 81 is fixed on the back of the fifth sliding plate 94 and moves up and down with the fifth sliding plate 94; the large sliding plate 84 is connected with the fourth support 81 through the fourth linear guide rail 82 and the fourth guide rail sliding block 83, the large sliding plate 84 is connected with the fourth bearing seat 86 through the fourth screw pair 85, the second hand wheel 87 is connected with the end of the fourth screw pair 85 through a key, rotating the second hand wheel 87 drives the fourth screw pair 85 to move the large sliding plate 84 left and right on the fourth linear guide rail 82, which is convenient for adjusting the left and right positions of the welding gun assembly 7; the large sliding plate 84 is provided with two small sliding plates 88 fixed on the left and right sides of the front edge of the large sliding plate 84, the small sliding plates 88 are fixed in the grooves of the large sliding plate 84 through the pressing plate 89, the small sliding plates 88 and the large sliding plate 84 are in clearance fit with the pressing plate 89, and the small sliding plates 88 can move left and right in the grooves of the large sliding plate 84; the locking wrench 810 can adjust the locking pressing block 811 to lock the small sliding plates 88, and fix the small sliding plates 88 after adjusting the positions; the welding gun holder 812 and the wire feeder 813 are fixed on the upper side of the small sliding plates 88, and adjusting the relative positions of the two small sliding plates 88 is adjusting the width of the welding gun assembly 7, which is fixed by the locking pressing block 811 after adjusting the positions according to the inner cavity of the workpiece 1; the two small sliding blocks 88 correspond to the two guide plates 48, and both are used for adjusting the width of the welding gun assembly 7; after adjusting the width, the positions of the second support 41 and the large sliding plate 84 are adjusted, so that the welding gun assembly 7 is aligned with the inner cavity position of the workpiece.

[0092] Figure 29 is a right view of the rear height adjustment mechanism 9, Figure 30 is a front view of the rear height adjustment mechanism 9,

[0093] The rear height adjusting mechanism 9 is mainly used for adjusting the height of the welding gun assembly 7, and the height position of the welding gun assembly 7 is adjusted together with the front height adjusting mechanism 3; the rear height adjusting mechanism 9 comprises a fifth support 91, a fifth linear guide rail 92, a fifth guide rail sliding block 93, a fifth sliding plate 94, a fifth screw pair 95, a second motor base 96, a fifth bearing base 97, a coupling 98, a second lifting motor 99, etc., the fifth support 91 is fixed at the front edge of the moving trolley 54 and moves together with the moving trolley 54; the fifth sliding plate 94 is connected with the fifth linear guide rail 92, the fifth guide rail sliding block 93 and the fifth support 91, and can slide along the fifth linear guide rail 92; the fifth screw pair 95 is fixed at the back of the fifth sliding plate 94, the screw rod of the fifth screw pair 95 is fixed at the fifth bearing base 97 through a bearing at one end, and the end is connected with the second lifting motor 99 through the coupling 98, and the second lifting motor 99 is fixed on the fifth support 91 through the second motor base 96; the second lifting motor 99 drives the fifth sliding plate 94 to realize the lifting movement through the fifth screw pair 95.

[0094] The drag chain 12 is fixed at one end on the moving trolley 54, and is fixed at the other end at the middle position of the moving trolley 54, and passes through the drag chain support 13 in the middle, and the drag chain support 13 is fixed on the side of the third support 61; when the moving trolley 54 moves, the drag chain is pushed to move, and the drag chain drives the drag chain support 13 to move, so as to push the balance roller device 6 to move.

[0095] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A welding torch assembly characterized by, The application relates to a welding gun assembly, which comprises a welding wire pipe assembly, a flux pipe, a connecting assembly, a sliding plate assembly and a flux distribution assembly, the welding wire pipe assembly is provided with the flux pipe on the side edge, is fixed by the connecting assembly, one end of the welding wire pipe assembly is fixed on a welding gun frame, and the other end of the welding wire pipe assembly is fixedly provided with the sliding plate assembly and the flux distribution assembly; the welding wire pipe assembly comprises a wire guide head, a fixed flange, a conductive block one, a conductive terminal, an insulating block one, a welding wire pipe outer pipe, an insulating pipe, a conductive pipe, a wire guide pipe, an insulating block two, a conductive block two, an insulating block, a guide block and a wire guide nozzle; one end of the wire guide head is inserted into a wire feeding machine wire outlet, the other end is inserted into the fixed flange, and the wire guide head is fixed on the wire feeding machine through the fixed flange; the fixed flange rear end is provided with the conductive block one, one end of the conductive block one is tightly screwed through an inner thread and an outer thread of the conductive pipe, the other end is provided with the conductive terminal, the conductive terminal is a copper bolt, and the conductive terminal is used for fixing a welding cable; the conductive block one rear end is provided with the insulating block one, the insulating block one is used for cutting off the connection of the conductive block one, the conductive pipe and the welding wire pipe outer pipe, and no current passes through the welding wire pipe outer pipe during welding; the insulating block one rear end is connected with the welding wire pipe outer pipe front end, the welding wire pipe outer pipe rear end is connected with the insulating block two, the insulating block two rear end is connected with the conductive block two, one end of the conductive block two is connected with the conductive pipe, the other end of the conductive block two is fixedly provided with the wire guide nozzle, and the fixed insulating block is arranged at the bottom of the conductive block two; the guide block is fixedly arranged on the side surface of the insulating block, and the insulating block is used for ensuring that the conductive block two and the guide block and the sliding plate assembly are insulated; the welding wire pipe outer pipe inner layer is provided with the insulating pipe, the insulating pipe inner layer is provided with the conductive pipe, and the conductive pipe inner layer is provided with the wire guide pipe; the conductive pipe two ends are respectively connected with the conductive block one and the conductive block two, are fixedly connected through threads, and are used for reliably conducting welding current; the wire guide pipe is used for smoothly feeding wire during welding, and reduces abrasion of the conductive pipe; one end of the wire guide nozzle is inserted into the conductive block two, is fixed by a wire guide, and the wire guide can be loosened to adjust the angle between the wire guide nozzle and a workpiece to be welded. The welding gun assembly comprises two groups of welding wire pipe assemblies and flux pipes, each group of welding wire pipe assembly and flux pipe is fixed together through a pressing plate one and a pressing plate two; dovetail blocks are used for connecting the two groups of welding wire pipe assemblies and the two groups of flux pipes together, the two groups of welding wire pipe assemblies are arranged on the outer sides, the two groups of flux pipes are arranged in the middle, the two groups of welding wire pipe assemblies and the two groups of flux pipes are placed side by side, and the two groups of welding wire pipe assemblies and the two groups of flux pipes are fixed together by at least two groups of connecting assemblies; one end of the welding wire pipe assembly is fixed on two welding gun frames, and the other end is fixedly provided with the sliding plate assembly and the flux distribution assembly; the welding wire pipe assembly guides welding wire from the wire feeding machine to the wire guide nozzle.

2. The torch assembly of claim 1 wherein, The connecting assembly comprises the pressing plate one, the pressing plate two, the dovetail block and the wire guide; the pressing plate one upper portion is provided with a dovetail groove, and the lower portion is provided with a semicircular hole; the pressing plate two upper portion is provided with a semicircular hole, and the semicircular hole and the semicircular hole of the pressing plate one lower portion form a whole circle, which is used for fixing the welding wire pipe outer pipe and the flux pipe; the dovetail block cross section is in the shape of a dovetail, can be inserted into the dovetail groove on the pressing plate one upper portion, and the dovetail block and the pressing plate one on the two sides are fixed together through the wire guide; the dovetail block is loosened, the depth of the dovetail groove on the pressing plate one upper portion is adjusted, the width of the welding gun assembly is adjusted, and the welding gun assembly can be adapted to workpieces of different sizes.

3. The torch assembly of claim 1 wherein, The sliding plate assembly comprises a sliding plate, a bottom plate and an upper pressing plate, the bottom plate is fixed at one end of the sliding plate, the upper part of the bottom plate is two semicircles, and the two semicircles form a whole circle together with the two semicircles of the lower part of the upper pressing plate, and the whole circle is fixed at one end of the welding wire pipe assembly, and the whole circle slides on the partition plate in the workpiece together with the welding wire pipe assembly during welding to complete the welding of the weld.

4. The torch assembly of claim 1 wherein, The flux distribution assembly comprises a concave plate, an upper plate and a lower plate, the upper plate and the lower plate are clamped to the flux pipe through screws, and the upper plate and the lower plate are fixed to the concave plate through screws; the flux is transported from the two flux pipes to the inner wall of the concave plate through pressure, and then flows to the two sides of the to-be-welded area.

5. The longitudinal seam double-gun welding machine for the air cooler tube box, characterized in that, The longitudinal seam double-gun welding machine in the tube box of the air cooler comprises a front height adjusting mechanism, a front horizontal adjusting mechanism, a bed body, a balance roller device, a welding gun assembly, a rear horizontal adjusting mechanism, a rear height adjusting mechanism, a flux conveying device, a welding wire disc, a drag chain and a drag chain support; the front end of the bed body is provided with a fixed front height adjusting mechanism, the front horizontal adjusting mechanism is fixed on a first sliding plate of the front height adjusting mechanism and rises and falls together with the first sliding plate, is used for adjusting the up-down and left-right positions of the welding gun assembly, and enables the welding gun assembly to smoothly enter the inner cavity of the workpiece; the balance roller device is connected with the bed body through a linear guide rail, a guide rail sliding block and the bed body, can move along the linear guide rail under the action of the drag chain, is used for supporting the welding gun assembly, avoids the welding gun assembly from sagging in the middle due to being too long, and causes unstable welding quality; the rear height adjusting mechanism is fixedly arranged at the front end of the moving trolley, can move together with the moving trolley, and is mainly used for adjusting the welding gun assembly in the height direction; the rear horizontal adjusting mechanism is fixed on a fifth sliding plate and rises and falls together with the fifth sliding plate, and is used for adjusting the horizontal position of the welding gun assembly; the front height adjusting mechanism, the front horizontal adjusting mechanism, the balance roller device, the rear horizontal adjusting mechanism and the rear height adjusting mechanism realize the up-down and left-right position adjustment of the welding gun assembly, so that the welding gun assembly is opposite to the weld position in the inner cavity of the workpiece.

6. The longitudinal seam double gun welding machine for air cooler tube sheet according to claim 5, characterized in that, The front horizontal adjusting mechanism comprises a second support, a second linear guide rail, a second guide rail sliding block, a second sliding plate, a second screw pair, a second bearing seat, a first hand wheel, a guide plate and a scale; one side of the second sliding plate is fixed with the first sliding plate of the front height adjusting mechanism and rises and falls together with the first sliding plate; the other side of the second sliding plate is fixed through the second linear guide rail, the second guide rail sliding block and the second support, the nut of the second screw pair is fixed on the second sliding plate, the screw rod of the second screw pair is fixed on the second bearing seat through a bearing, the second bearing seat is fixed on one end of the second support, and the first hand wheel is connected to the end of the screw rod of the second screw pair through a key; rotating the first hand wheel drives the second screw pair to make the second support slide horizontally; the guide plates are fixed on the back of the second support and are symmetrically arranged and fixed, two can be adjusted, the interval between the two guide plates is adjusted to be the same as the width of the inner cavity of the workpiece, and the welding gun assembly can conveniently enter the inner cavity of the workpiece.

7. The longitudinal seam double gun welding machine for air cooler tube sheet according to claim 5, wherein, The balancing roller device comprises a third support, a third linear guide rail, a third guide rail slider, a supporting assembly, a counterweight, a steel wire rope and a pulley block; the lower edge of the third support is fixed through the linear guide rail, the guide rail slider and the bed body and can move back and forth along the linear guide rail; the supporting assembly is fixed on the front edge of the third support through the third linear guide rail and the third guide rail slider and can move up and down along the third linear guide rail; the pulley block is symmetrically arranged on the upper edge of the third support; the steel wire rope is wound around the pulley block, one end of the steel wire rope is connected to the upper end of the supporting assembly, and the other end of the steel wire rope is connected to the counterweight; the welding gun assembly is placed on the rollers of the supporting assembly, and part of the gravity of the welding gun assembly is balanced by the counterweight; the supporting assembly comprises a roller support and rollers, the two roller supports are symmetrically fixed on the third slider, and the rollers are connected to the two roller supports through bearings; the balancing roller device is moved by the drag chain to push the drag chain support to move forward, so that the balancing roller device can move with the movement of the moving trolley; one end of the drag chain is fixed on the moving trolley, the other end of the drag chain is fixed at the middle position of the moving path of the moving trolley, the middle part of the drag chain passes through the drag chain support, and the drag chain support is fixed on the side surface of the third support; when the moving trolley moves, the drag chain moves, the drag chain drives the drag chain support to move, thereby pushing the movement of the balancing roller device.

8. The longitudinal seam double gun welding machine for air cooler tube sheet according to claim 5, wherein, The rear horizontal adjustment mechanism comprises a fourth support, a fourth linear guide rail, a fourth guide rail slider, a large slide plate, a fourth screw pair, a fourth bearing seat, a second hand wheel, a small slide plate, a pressing plate, a locking wrench, a locking pressing block, a welding gun holder and a wire feeder; the fourth support is fixed on the back of the fifth slide plate and moves up and down with the fifth slide plate; the large slide plate is connected to the fourth support through the fourth linear guide rail, the fourth guide rail slider and the fourth support; the large slide plate is connected to the fourth bearing seat through the fourth screw pair; the second hand wheel is fixed on the end of the fourth screw pair through a key; rotating the second hand wheel drives the fourth screw pair to move the large slide plate left and right along the fourth linear guide rail, thereby adjusting the welding gun assembly left and right; the two small slide plates are fixed on the front edge of the large slide plate; the small slide plate is fixed in the groove of the large slide plate through the pressing plate; the small slide plate can move left and right in the groove of the large slide plate; the locking wrench can adjust the locking pressing block to lock the small slide plate; the welding gun holder and the wire feeder are fixed on the upper edge of the small slide plate; adjusting the relative position of the two small slide plates is to adjust the width of the welding gun assembly; the welding gun assembly is fixed by the locking pressing block after adjusting the position according to the inner cavity of the workpiece; the two small slide plates correspond to the two guide plates and are used to adjust the width of the welding gun assembly; after adjusting the width, the welding gun assembly is aligned with the position of the inner cavity of the workpiece by adjusting the position of the second support and the large slide plate.

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