Auxiliary control system and control method for sheet metal part welding machining

Abstract

The invention is suitable for the technical field of welding assistance, and provides an auxiliary control system and control method for sheet metal part welding machining, the auxiliary control system comprises a welding assembly, a first positioning piece is in sliding fit with the welding assembly, and a second positioning piece is in sliding fit with the side, away from the first positioning piece, of the welding assembly; the auxiliary control system solves the problems that when an existing auxiliary control system for sheet metal part welding machining is used for conducting welding machining on sheet metal, alignment operation before welding is difficult to conduct on two sheet metal parts to be welded, and consequently the sheet metal parts cannot be welded easily when welding operation is conducted in the later period. The problems that the operation process is too complex and the welding effect of the two sheet metal parts is reduced due to the fact that the two sheet metal parts which are attached to each other need to be aligned and righting by means of other modes in the prior art are solved, the alignment operation of the two sheet metal parts before welding can be completed, and the welding effect of the two sheet metal parts is synchronously improved while the welding process is simplified.

Description

Technical Field

[0001] The present invention relates to the field of welding auxiliary technology, and more specifically, to an auxiliary control system and a control method for sheet metal welding processing. Background Art

[0002] In the process of sheet metal processing, it is often necessary to weld various sheet metal parts. The most common ones are horizontal and vertical butt welding. The auxiliary control system of welding processing includes a set of welding fixing, clamping and positioning fixtures, which are mainly used for welding various weldable materials, large, medium and small materials. The welding auxiliary tooling in the auxiliary control system of welding processing generally controls the clamps to clamp and fix the sheet metal parts by using power mechanisms such as cylinders, so as to facilitate the welding of sheet metal parts by welding guns.

[0003] At present, the auxiliary control systems for sheet metal welding processing on the market often have the following technical problems when welding sheet metal to form sheet metal parts: The existing auxiliary control system for sheet metal welding processing has difficulty in aligning the two sheet metal parts to be welded before welding, resulting in the need to use other methods to align and straighten the two sheet metal parts that are bonded to each other during the subsequent welding operation, which makes the operation process too complicated and reduces the welding effect of the two sheet metals. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an auxiliary control system and control method for sheet metal welding processing that can complete the alignment operation of two sheet metal parts before welding, so as to avoid the need to use other methods to align and straighten the two sheet metal parts that are bonded to each other during the subsequent welding operation. While simplifying the welding process, it also simultaneously improves the welding effect of the two sheet metal parts.

[0005] To achieve the above object, the present invention provides the following technical solutions: An auxiliary control system for sheet metal welding processing comprises a welding assembly, a first positioning piece is slidably matched on the welding assembly, and a second positioning piece is slidably matched on a side of the welding assembly away from the first positioning piece.

[0006] The welding assembly comprises a fixing part and a lifting part which is slidably fitted inside the fixing part.

[0007] The fixing member includes a working frame, and the working frame has cross grooves fixed on two opposite sides thereof for slidingly cooperating with the lifting member. Two symmetrical first side panels are fixed on the outer top of the working frame, and two symmetrical second side panels are fixed on the side of the outer top of the working frame away from the two first side panels. A first inclined slide groove and a second inclined slide groove are respectively penetrated by one side of the first side panel and the second side panel.

[0008] The first positioning member is slidably disposed between the two first inclined sliding grooves, and the second positioning member is slidably disposed between the two second inclined sliding grooves.

[0009] Two symmetrical pins are fixed on the opposite sides of the working frame, and a folding plate is rotatably engaged with the side surface of the pin. A first shifting rod that slides with the lifting member is fixed on one side of the folding plate, and a shifting groove is penetrated through one side of the folding plate, and the shifting groove slides with the first positioning member and the second positioning member.

[0010] The present invention is further configured as follows: a supporting base plate is fixed near the bottom inside the work frame, a telescopic cylinder is fixed on the top of the supporting base plate, and a first connecting flange is fixed on the telescopic end of the telescopic cylinder.

[0011] The lifting member includes a second connecting flange fixedly connected to the first connecting flange, a cross beam plate is fixed on the top of the second connecting flange, cross rails slidably fitted in the cross groove are fixed on the opposite sides of the cross beam plate, lifting plates are fixed on the opposite sides of the two cross rails, two symmetrical third inclined grooves are penetrated on one side of the lifting plate, and the third inclined grooves are slidably fitted with the first shift rod.

[0012] The present invention is further configured as follows: the first positioning member includes two symmetrical first T-shaped inclined slide rails, and the two first T-shaped inclined slide rails are respectively slidably matched with the two first inclined slide grooves.

[0013] A second shifting rod which is slidably matched with the shifting groove is fixed on the opposite side surfaces of the two first T-shaped inclined slide rails.

[0014] The present invention is further configured as follows: a first U-shaped plate is fixed between the two first T-shaped inclined slide rails and is obliquely slidably fitted between the two first side plates; a mounting frame plate is fixed to the bottom of the first U-shaped plate; an electric telescopic rod is fixed to one side of the mounting frame plate; a movable side plate is fixed to the telescopic end of the electric telescopic rod; and a rectangular plug-in block is fixed to one side of the movable side plate.

[0015] The inner wall of the first U-shaped plate is located inside the first U-shaped plate and is rotatably matched with a first rotating shaft. One end of the first rotating shaft is located outside the first U-shaped plate and is provided with a rectangular plug-in groove that is plug-matched with a rectangular plug-in block.

[0016] The present invention is further configured as follows: a first receiving plate is fixed inside the first U-shaped plate relative to the other end surface of the first rotating shaft, two symmetrical first vertical plates are fixed on the top of the first receiving plate, two symmetrical first sliding rods are slidably arranged on the side surfaces opposite to each other of the two first vertical plates, a first limiting circular plate is fixed at one end of the two first sliding rods, and a first trapezoidal moving block is fixed to the other end surface of the two first sliding rods.

[0017] Two first springs are fixed between the first trapezoidal moving block and the first vertical plate and are respectively sleeved and arranged on the peripheral side surfaces of the two first sliding bars.

[0018] The present invention is further configured as follows: two symmetrical first cross grooves are provided on two opposite side surfaces of the first supporting plate; a first cross block is slidably engaged inside the first cross groove; a first guide rod slidably engaged with the first cross block is fixed to the inner wall of the first cross groove; a second spring sleeved on the first guide rod is fixed between the first cross block and the first cross groove; and a first L-shaped clamp located above the first guide rod is fixed to one side of the first cross block.

[0019] A first sliding column is slidably arranged through the center position of the top of the first supporting plate, and two symmetrical first displacement plates are fixed to the bottom of the first sliding column below the first supporting plate. Two symmetrical first hinged seats are fixed on the opposite sides of the two first displacement plates, and a first lifting arm is hingedly cooperated inside the first hinged seat.

[0020] A second hinged seat hingedly matched with the first lifting arm is fixed at the bottom of the first cross block.

[0021] The present invention is further configured as follows: the second positioning member includes two symmetrical second T-shaped inclined slide rails, and the two second T-shaped inclined slide rails are respectively slidably matched with the two second inclined slide grooves.

[0022] A third shifting rod slidably matched with the shifting groove is fixed on the opposite side surfaces of the two second T-shaped inclined slide rails.

[0023] A second U-shaped plate is fixed between the two second T-shaped inclined slide rails and is slidably matched between the two second side plates. A brake motor is fixed to an outer side surface of the second U-shaped plate.

[0024] The present invention is further configured as follows: a second rotating shaft fixedly connected to the output shaft of the brake motor is rotatably cooperated inside the second U-shaped plate, one end of the second rotating shaft is located inside the second U-shaped plate and a second receiving plate is fixed thereto, two symmetrical second vertical plates are fixed on the top of the second receiving plate, two symmetrical second sliding rods are slidably arranged on the opposite side surfaces of the two second vertical plates, a second limiting circular plate is fixed at one end of the two second sliding rods, a second trapezoidal moving block is fixed to the other end surface of the two second sliding rods, and two third springs which are respectively sleeved on the peripheral side surfaces of the two second sliding rods are fixed between the second trapezoidal moving block and the second vertical plate.

[0025] The present invention is further configured as follows: two symmetrical second cross grooves are provided on two opposite side surfaces of the second supporting plate; a second cross block is slidably engaged inside the second cross groove; a second guide rod slidably engaged with the second cross block is fixed inside the second cross groove; a fourth spring sleeved on the second guide rod is fixed between the second cross block and the second cross groove; and a second L-shaped clamp located above the second guide rod is fixed on one side of the second cross block.

[0026] A second sliding column is slidably arranged through the center position of the top of the second supporting plate, and two symmetrical second displacement plates are fixed to the bottom of the second sliding column below the second supporting plate. Two symmetrical third hinged seats are fixed on the opposite sides of the two second displacement plates, and a second lifting arm is hingedly fitted inside the third hinged seat.

[0027] A fourth hinged seat hingedly matched with the second lifting arm is fixed at the bottom of the second cross block.

[0028] The present invention is further configured as: a control method for an auxiliary control system for sheet metal welding processing, comprising the following control method: T1. During the use of the system, one of the sheet metal parts to be welded is horizontally pressed and placed on the top of the first receiving plate, and thereby a pressing operation is performed on one of the sheet metal parts to be welded, driving the two first trapezoidal moving blocks to move away from each other, until the bottom of one of the sheet metal parts to be welded contacts the top of the first sliding column, and then one of the sheet metal parts to be welded continues to be pressed downward.

[0029] T2. While continuing to press one of the sheet metal parts to be welded, the two opposite side surfaces of one of the sheet metal parts to be welded continue to slide downward on the inclined surfaces of the two first trapezoidal moving blocks, generating an articulating rotation force on the first lifting arm respectively hingedly engaged between the first displacement plate and the second articulated seat.

[0030] T3. When the two opposite side surfaces of one of the sheet metal parts to be welded in step T2 slide out from the inclined surfaces of the two first trapezoidal moving blocks and enter the bottom of the two first trapezoidal moving blocks, the first L-shaped clamps respectively fixedly connected to the other opposite side surfaces of the first cross blocks are fitted with the two opposite side surfaces of one of the sheet metal parts to be welded, thereby completing the straightening and positioning operation of one of the sheet metal parts to be welded before welding.

[0031] After steps T4, T1 to T3 are completed, the other sheet metal to be welded is horizontally pressed and placed on the top of the second receiving plate, and the other sheet metal to be welded is pressed to drive the two second trapezoidal moving blocks to move away from each other until the bottom of the other sheet metal to be welded contacts the top of the second sliding column, and then the other sheet metal to be welded continues to be pressed downward.

[0032] T5. While continuing to press the other sheet metal part to be welded, the two opposite side surfaces of the other sheet metal part to be welded continue to slide downward on the inclined surfaces of the two second trapezoidal moving blocks, generating an articulating rotation force on the second lifting arm respectively hingedly engaged between the second displacement plate and the third articulated seat.

[0033] T6. When the two opposite side surfaces of the other sheet metal to be welded in step T5 slide out from the inclined surfaces of the two second trapezoidal moving blocks and enter the bottom of the second trapezoidal moving blocks, the second L-shaped clamps respectively fixedly connected to the other opposite side surfaces of the second cross blocks are fitted with the two opposite side surfaces of the other sheet metal to be welded, thereby completing the straightening and positioning operation of the other sheet metal to be welded before welding.

[0034] After steps T7 and T1 to T6 are completed, the telescopic cylinder is started to drive the lifting member to move downward, so that the two first levers that are respectively slidably engaged in the third inclined slide groove and located on the same side are synchronously moved relative to each other in the third inclined slide groove, driving the folding plates on the same side that are respectively rotatably engaged in the side surfaces of the two pin shafts to rotate synchronously relative to each other, so that the first positioning member and the second positioning member that are slidably engaged between the two first inclined slide grooves and the two second inclined slide grooves move obliquely toward each other, until the welding end surfaces of the two welded sheet metal parts that are respectively positioned and supported in the first positioning member and the second positioning member are fitted to each other, and then the telescopic cylinder is closed.

[0035] T8. After the above steps are completed, the upper surfaces of the two sheet metal parts are welded by an external welding gun. After the welding is completed, the electric telescopic rod is started to separate the rectangular plug-in block from the rectangular plug-in slot, the electric telescopic rod is closed, and the brake motor is started to make the first positioning member, the second positioning member and the two sheet metal parts to be welded positioned therein synchronously perform a 180° flip operation, so as to perform a welding operation on the lower surfaces of the two sheet metal parts to be welded.

[0036] The advantages of the present invention are: 1. The present invention starts the telescopic cylinder to drive the entire lifting member to move downward synchronously inside the two cross grooves, so that the two first levers that are respectively slidably matched inside the third inclined slide groove and located on the same side are synchronously relatively moved inside the third inclined slide groove, so that the folding plates on the same side that are respectively rotated and matched with the two pin shaft peripheral side surfaces are synchronously relatively rotated, driving the first positioning member and the second positioning member that are slidably matched between the two first inclined slide grooves and the two second inclined slide grooves to make oblique movements close to each other, until the welding end faces of the two welded sheet metal parts that are respectively positioned and corrected inside the first positioning member and the second positioning member are fitted to each other, thereby completing the alignment operation of the two sheet metal parts before welding, avoiding the need to use other methods to perform alignment and correction operations on the two sheet metal parts that are fitted to each other during the later welding operation, while simplifying the welding process, it also simultaneously improves the welding effect of the two sheet metal parts.

[0037] 2. The present invention uses the two opposite side surfaces of one of the sheet metal parts to be welded to synchronously extrude the inclined surfaces of the two relatively slidable first trapezoidal moving blocks, so that the two first trapezoidal moving blocks synchronously slide away from each other until the bottom of one of the sheet metal parts to be welded contacts with the top of the first sliding column, and continues to press downward on one of the sheet metal parts to be welded, driving the first sliding column to slide downward, so that the first lifting arms respectively hingedly matched between the first hinge seat and the second hinge seat generate a hinged rotation force, driving the first L-shaped clamps respectively fixedly connected to the other side surfaces of the first cross blocks to synchronously approach the two opposite side surfaces of one of the sheet metal parts to be welded, so as to perform the straightening operation on one of the sheet metal parts to be welded before welding, thereby avoiding the phenomenon that one of the sheet metal parts to be welded is skewed during the later welding and fixing, and preventing it from affecting the later welding process.

[0038] 3. The present invention uses the two opposite side surfaces of the other sheet metal to be welded to synchronously extrude the inclined surfaces of the two second trapezoidal moving blocks that are relatively slidably arranged, so that the two second trapezoidal moving blocks synchronously slide away from each other until the bottom of the other sheet metal to be welded contacts with the top of the second sliding column, and continues to press the other sheet metal to be welded downward, driving the second sliding column to slide downward, so that the second lifting arm that is respectively hingedly engaged between the fourth hinge seat and the third hinge seat generates a hinged rotation force, driving the second L-shaped clamps that are respectively fixedly connected to the other side surfaces of the second cross blocks to synchronously approach the two opposite side surfaces of the other sheet metal to be welded, so as to perform the straightening operation on the other sheet metal to be welded before welding, thereby avoiding the phenomenon that the other sheet metal to be welded is skewed during the later welding and fixing, and preventing it from affecting the later welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 The present invention is a schematic structural diagram of an auxiliary control system for sheet metal welding processing.

[0040] Figure 2 It is a schematic structural diagram of the welding assembly of the present invention.

[0041] Figure 3 It is a schematic structural diagram of the fixing member of the present invention.

[0042] Figure 4 It is a top view of the fixing member of the present invention.

[0043] Figure 5 It is a structural schematic diagram of the lifting member of the present invention.

[0044] Figure 6 It is a front view of the lifting member of the present invention.

[0045] Figure 7 It is a schematic diagram of the structure of the first positioning member of the present invention from a top view.

[0046] Figure 8 This is a schematic diagram of the structure of the first positioning member of the present invention from a bottom-up perspective.

[0047] Fig. 9 It is a top view of the first positioning member of the present invention.

[0048] Fig.10 It is a schematic diagram of the structure of the second positioning member of the present invention from a top view.

[0049] Fig.11 This is a schematic diagram of the structure of the second positioning member of the present invention from a bottom-up perspective.

[0050] Fig.12 It is a top view of the second positioning member of the present invention.

[0051] In the figure: 1, welding assembly; 2, first positioning member; 3, second positioning member; 4, fixing member; 5, lifting member; 201, first T-shaped inclined slide rail; 202, second lever; 203, first U-shaped plate; 204, mounting frame plate; 205, electric telescopic rod; 206, movable side plate; 207, rectangular plug-in block; 208, first rotating shaft; 209, first receiving plate; 210, first vertical plate; 211, first slide bar; 212, first limiting circular plate; 213, first Trapezoidal moving block; 214, first spring; 215, first cross groove; 216, first cross block; 217, first guide rod; 218, second spring; 219, first L-shaped clamping plate; 220, first sliding column; 221, first displacement plate; 222, first articulated seat; 223, first lifting arm; 224, second articulated seat; 301, second T-shaped inclined slide rail; 302, third lever; 303, second U-shaped plate; 304, brake motor; 305, second Rotating shaft; 306, second receiving plate; 307, second vertical plate; 308, second sliding rod; 309, second limiting circular plate; 310, second trapezoidal moving block; 311, third spring; 312, second cross groove; 313, second cross block; 314, second guide rod; 315, fourth spring; 316, second L-shaped clamping plate; 317, second sliding column; 318, second displacement plate; 319, third hinge seat; 320, second lifting arm; 321, fourth hinge Seat; 401, work frame; 402, cross groove; 403, first side plate; 404, second side plate; 405, first inclined slide; 406, second inclined slide; 407, folding plate; 408, first shifting rod; 409, shifting groove; 410, supporting bottom plate; 411, telescopic cylinder; 412, first connecting flange; 413, pin shaft; 501, second connecting flange; 502, cross beam plate; 503, cross rail; 504, lifting plate; 505, third inclined slide. DETAILED DESCRIPTION

[0052] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0053] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0054] In the present invention, unless otherwise specified, the directions used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.

[0055] For example, see Figure 1-12 , the present invention provides the following technical solutions: An auxiliary control system for sheet metal welding processing, specifically, includes a welding assembly 1, a first positioning member 2 is slidably matched on the welding assembly 1, and a second positioning member 3 is slidably matched on the side of the welding assembly 1 away from the first positioning member 2; the welding assembly 1 includes a fixing member 4 and a lifting member 5 slidably matched inside the fixing member 4; the fixing member 4 includes a working frame 401, and the working frame 401 has two opposite side surfaces fixed with cross grooves 402 that are slidably matched with the lifting member 5, two symmetrical first side plates 403 are fixed on the outer top of the working frame 401, and two symmetrical second side plates 403 are fixed on the outer top of the working frame 401 away from the two first side plates 403. Plate 404, the first side plate 403, and the second side plate 404 are respectively penetrated with a first inclined slot 405 and a second inclined slot 406; the first positioning member 2 is slidably set between the two first inclined slots 405, and the second positioning member 3 is slidably set between the two second inclined slots 406; two symmetrical pins 413 are fixed on the opposite sides of the working frame 401, and a folding plate 407 is rotatably engaged with the side surface of the pin 413, and a first shifting rod 408 that slidably cooperates with the lifting member 5 is fixed on one side of the folding plate 407, and a toggle groove 409 is penetrated on one side of the folding plate 407, and the toggle groove 409 is slidably engaged with the first positioning member 2 and the second positioning member 3.

[0056] Furthermore, a supporting base plate 410 is fixed near the bottom inside the working frame 401, a telescopic cylinder 411 is fixed on the top of the supporting base plate 410, and a first connecting flange 412 is fixed on the telescopic end of the telescopic cylinder 411; the lifting member 5 includes a second connecting flange 501 fixedly connected to the first connecting flange 412, a cross beam 502 is fixed on the top of the second connecting flange 501, and cross rails 503 that are slidably matched inside the cross groove 402 are fixed on the opposite sides of the cross rails 502, and lifting plates 504 are fixed on the opposite sides of the two cross rails 503, and two symmetrical third inclined grooves 505 are opened on one side of the lifting plate 504, and the third inclined grooves 505 are slidably matched with the first shift rod 408.

[0057] The specific application of this embodiment 1 is: After the two sheet metal parts to be welded are respectively placed and positioned inside the first positioning member 2 and the second positioning member 3, the telescopic cylinder 411 fixed on the top of the supporting bottom plate 410 is started to drive the cross beam plate 502 fixed on the telescopic cylinder 411 to retract and move between the two cross grooves 402, so that the cross rails 503 fixed on the two sides of the cross beam plate 502 are synchronously moved downward inside the two cross grooves 402. When the cross rails 503 fixed on the two sides of the cross beam plate 502 are synchronously moved downward inside the two cross grooves 402, the lifting plates 504 fixed on the opposite sides of the two cross rails 503 are synchronously moved downward. At this time, the two first levers 408 respectively slidably matched inside the third inclined slot 505 and located on the same side are synchronously moved relative to each other inside the third inclined slot 505, so that the same The folding plates 407 on one side respectively rotate and cooperate with the side surfaces of the two pin shafts 413 to rotate synchronously relative to each other, and thereby provide a force for the first positioning member 2 and the second positioning member 3 slidingly cooperated in the toggle groove 409 to move obliquely towards each other, thereby driving the first positioning member 2 and the second positioning member 3 slidingly cooperated between the two first inclined slide grooves 405 and the two second inclined slide grooves 406 to move obliquely towards each other, until the welding end surfaces of the two sheet metal parts to be welded which are respectively positioned and straightened in the first positioning member 2 and the second positioning member 3 are fitted together, and then the telescopic cylinder 411 is closed to complete the alignment operation of the two sheet metal parts before welding, thereby avoiding the need to use other methods to align and straighten the two sheet metal parts that are fitted together during the later welding operation. While simplifying the welding process, the welding effect of the two sheet metal parts is also improved simultaneously.

[0058] For example 2, please refer to Figure 1-12, the second embodiment is improved on the basis of the first embodiment as follows. Specifically, the first positioning member 2 includes two symmetrical first T-shaped inclined slide rails 201, and the two first T-shaped inclined slide rails 201 are respectively slidably matched with the two first inclined slide grooves 405; the two first T-shaped inclined slide rails 201 are fixed with a second lever 202 that is slidably matched with the toggle groove 409 on the opposite side; a first U-shaped plate 203 that is obliquely slidably matched between the two first side plates 403 is fixed between the two first T-shaped inclined slide rails 201, a mounting frame plate 204 is fixed at the bottom of the first U-shaped plate 203, an electric telescopic rod 205 is fixed on one side of the mounting frame plate 204, a movable side plate 206 is fixed on the telescopic end of the electric telescopic rod 205, and a rectangular The plug-in block 207; the inner wall of the first U-shaped plate 203 is located inside the first U-shaped plate 203 and is rotatably matched with a first rotating shaft 208, one end of the first rotating shaft 208 is located outside the first U-shaped plate 203 and is provided with a rectangular plug-in groove that is plugged and matched with the rectangular plug-in block 207; the first rotating shaft 208 is located inside the first U-shaped plate 203 opposite to the other end surface thereof and is fixed with a first receiving plate 209, two symmetrical first vertical plates 210 are fixed on the top of the first receiving plate 209, and two symmetrical first sliding rods 211 are slidably provided through the opposite side surfaces of the two first vertical plates 210, and a first limiting circular plate 212 is fixed to one end of the two first sliding rods 211, and a first trapezoidal moving block 213 is fixed to the other end surfaces of the two first sliding rods 211; Two first springs 214 are fixed between the first trapezoidal moving block 213 and the first vertical plate 210, which are respectively sleeved on the sides of the two first sliding rods 211; two symmetrical first cross grooves 215 are opened on the opposite sides of the first receiving plate 209, and a first cross block 216 is slidably matched inside the first cross groove 215. A first guide rod 217 that is slidably matched with the first cross block 216 is fixed on the inner wall of the first cross groove 215, and a second spring 218 sleeved on the first guide rod 217 is fixed between the first cross block 216 and the first cross groove 215. A first L-shaped clamping plate 219 located above the first guide rod 217 is fixed on one side of the first cross block 216; the top center position of the first receiving plate 209 is penetrated by A first sliding column 220 is provided for sliding, and two symmetrical first displacement plates 221 are fixed at the bottom of the first sliding column 220 below the first receiving plate 209, and two symmetrical first hinge seats 222 are fixed on the opposite sides of the two first displacement plates 221, and the first hinge seats 222 are hingedly matched with the first lifting arm 223; a second hinge seat 224 hingedly matched with the first lifting arm 223 is fixed at the bottom of the first cross block 216; the second positioning member 3 includes two symmetrical second T-shaped inclined slide rails 301, and the two second T-shaped inclined slide rails 301 are respectively slidably matched with the two second inclined slide grooves 406; a third shifting rod 302 slidably matched with the shifting groove 409 is fixed on the opposite sides of the two second T-shaped inclined slide rails 301;A second U-shaped plate 303 is fixed between the two second T-shaped inclined slide rails 301 and is slidably fitted between the two second side plates 404. A brake motor 304 is fixed to an outer side of the second U-shaped plate 303. A second rotating shaft 305 is rotatably fitted inside the second U-shaped plate 303 and is fixedly connected to the output shaft of the brake motor 304. One end of the second rotating shaft 305 is located inside the second U-shaped plate 303 and is fixed with a second receiving plate 306. Two symmetrical second vertical plates are fixed on the top of the second receiving plate 306. The second vertical plates 307 are provided with two symmetrical second slide bars 308 on the opposite sides of the two second vertical plates 307, and the second limit circular plates 309 are fixed on one end of the two second slide bars 308. The second trapezoidal moving blocks 310 are fixed on the other end faces of the two second slide bars 308. Two third springs 311 are respectively sleeved and arranged on the sides of the two second slide bars 308 between the second trapezoidal moving blocks 310 and the second vertical plates 307. The second receiving plate 306 is provided with two openings on the opposite sides of the second receiving plate 306. There are two symmetrical second cross grooves 312, and a second cross block 313 is slidably matched inside the second cross groove 312. A second guide rod 314 that is slidably matched with the second cross block 313 is fixed inside the second cross groove 312. A fourth spring 315 that is sleeved and matched on the second guide rod 314 is fixed between the second cross block 313 and the second cross groove 312. A second L-shaped clamping plate 316 located above the second guide rod 314 is fixed on one side of the second cross block 313; a second sliding column 317 is slidably set through the center of the top of the second receiving plate 306, and two symmetrical second displacement plates 318 are fixed at the bottom of the second sliding column 317 below the second receiving plate 306. Two symmetrical third hinge seats 319 are fixed on the opposite sides of the two second displacement plates 318, and a second lifting arm 320 is hingedly matched inside the third hinge seat 319; a fourth hinge seat 321 that is hingedly matched with the second lifting arm 320 is fixed at the bottom of the second cross block 313. ;

[0059] The specific application of the second embodiment is as follows: when the first positioning member 2 and the second positioning member 3 move obliquely toward each other, the second lever 202 and the third lever 302 slide inside the toggle groove 409 respectively, and thereby provide a force for the oblique sliding process of the first T-shaped inclined slide rail 201 and the second T-shaped inclined slide rail 301 inside the first inclined slide groove 405 and the second inclined slide groove 406, so as to achieve the effect of synchronously obliquely approaching the first positioning member 2 and the second positioning member 3, so as to facilitate the positioning and straightening operation of the two sheet metal parts to be welded located inside the first positioning member 2 and the second positioning member 3 before welding; One of the sheet metal parts to be welded is horizontally pressed and placed on the top of the first receiving plate 209. During the horizontal placement process, the two opposite side surfaces of one of the sheet metal parts to be welded synchronously squeeze the inclined surfaces of the two first trapezoidal moving blocks 213 that are relatively slidably arranged, driving the two first sliding rods 211 fixed on one side of the first trapezoidal moving block 213 to slide on the first vertical plate 210, and thereby compressing and squeezing the two first springs 214 connected and fixed between the first trapezoidal moving block 213 and the first vertical plate 210, so that the two first trapezoidal moving blocks 213 synchronously slide away from each other until one of the sheet metal parts to be welded When the bottom of the part contacts the top of the first sliding column 220, one of the sheet metal parts to be welded continues to be pressed downward. At this time, the two opposite sides of one of the sheet metal parts to be welded continue to slide downward on the inclined surfaces of the two first trapezoidal moving blocks 213. During the downward sliding process of the first sliding column 220, a hinged rotation force is generated on the first lifting arm 223 respectively hingedly matched between the first hinge seat 222 and the second hinge seat 224, and this is combined with the elastic force of the second spring 218 fixedly connected between the first cross block 216 and the first cross groove 215, so that a plurality of sheet metal parts respectively fixedly connected to the outer top of the second hinge seat 224 can be hinged to each other. The first cross blocks 216 are respectively moved closer to the opposite sides of one of the sheet metal parts to be welded in the first cross grooves 215, until the top of the first sliding column 220 is flush with the top of the first receiving plate 209, and the opposite sides of one of the sheet metal parts to be welded slide out from the inclined surfaces of the two first trapezoidal moving blocks 213 and enter the bottom of the two first trapezoidal moving blocks 213. At this time, the compressed first spring 214 begins to reset, and the two first trapezoidal moving blocks 213 are reset synchronously (after the two first trapezoidal moving blocks 213 are reset, the top of one of the sheet metal parts to be welded and the bottom of the two first trapezoidal moving blocks 213 are aligned). When the first cross blocks 216 respectively fixedly connected to the outer top of the second hinge seat 224 respectively approach the two opposite sides of one of the sheet metal parts to be welded in the first cross grooves 215, the first L-shaped clamping plates 219 respectively fixedly connected to the other opposite sides of the first cross blocks 216 synchronously approach the two opposite sides of one of the sheet metal parts to be welded, so as to perform a straightening operation on one of the sheet metal parts to be welded before welding, so as to avoid the phenomenon that one of the sheet metal parts to be welded is skewed during the later welding and fixing, and prevent it from affecting the later welding process; After the horizontal pressing and placing process of one of the sheet metal parts to be welded is completed, the other sheet metal part to be welded is horizontally pressed and placed on the top of the second receiving plate 306. During the horizontal pressing and placing process, the two opposite side surfaces of the other sheet metal part to be welded synchronously squeeze the inclined surfaces of the two second trapezoidal moving blocks 310 that are relatively slidably arranged, driving the two second sliding rods 308 fixed on one side of the second trapezoidal moving block 310 to slide on the second vertical plate 307, and thereby compressing and squeezing the two third springs 311 connected and fixed between the second trapezoidal moving block 310 and the second vertical plate 307, so that the two second trapezoidal moving blocks 310 synchronously move relative to each other. The second support frame 317 is provided with a plurality of support members 314, 316 and 317. The support members 314 are provided with a plurality of support members 316, 317 and 317 respectively. The second cross block 313 at the top of the fourth hinge seat 320 respectively approaches the opposite sides of the other sheet metal to be welded in the plurality of second cross grooves 312, until the top of the second sliding column 317 is flush with the top of the second receiving plate 306, and the opposite sides of the other sheet metal to be welded slide out from the inclined surfaces of the two second trapezoidal moving blocks 310 and enter the bottom of the two second trapezoidal moving blocks 310. At this time, the compressed third spring 311 begins to reset, and the two second trapezoidal moving blocks 310 are reset synchronously (after the two second trapezoidal moving blocks 310 are reset, the top of the other sheet metal to be welded is flush with the two second trapezoidal moving blocks 3 10 is in a mutually fitted state), when the second cross blocks 313 respectively fixedly connected to the outer top of the fourth hinge seat 321 respectively approach the opposite two sides of the other sheet metal to be welded in the second cross grooves 312, the second L-shaped clamping plates 316 respectively fixedly connected to the other side of the second cross blocks 313 synchronously approach the opposite two sides of the other sheet metal to be welded, so as to perform a straightening operation on the other sheet metal to be welded before welding, so as to avoid the phenomenon that one of the sheet metal to be welded is skewed when it is welded and fixed later, and prevent it from affecting the later welding process; After the two sheet metal parts to be welded are positioned step by step before welding, the first positioning member 2 and the second positioning member 3 are synchronously moved obliquely upward until the welding parts of the two sheet metal parts to be welded after the step-by-step positioning are fitted together, and then the welding parts of the two sheet metal parts to be welded that are fitted together are welded by an external welding gun. After the upper surfaces of the two sheet metal parts are welded, the electric telescopic rod 205 is started to drive the moving side plate 206 fixed at its telescopic end and the rectangular plug-in block 207 fixed at one side of the moving side plate 206 to perform a contraction movement, so that the rectangular plug-in block 207 is gradually The first rotating shaft 208 slides out from the rectangular plug-in slot provided at one end of the first rotating shaft 208. When the rectangular plug-in block 207 completely slides out from the rectangular plug-in slot, the electric telescopic rod 205 is closed, and the brake motor 304 is started synchronously, driving the second receiving plate 306 fixed at one end of the second rotating shaft 305 and another sheet metal part fixed on the top of the second receiving plate 306 for positioning and straightening to synchronously perform a 180° flip operation inside the second U-shaped plate 303 (the 180° flip operation of the brake motor 304 can be specifically realized through the PLC control panel inside the external controller, The PLC control panel inside the external controller is a prior art, which is not shown in the figure and will not be elaborated on here. While performing the 180° flipping operation, since the upper surfaces of the two sheet metal parts to be welded have completed the welding operation after being straightened and positioned step by step, the second receiving plate 306 fixed at one end of the second rotating shaft 305 and the other sheet metal part fixed on the top of the second receiving plate 306 for positioning and straightening are synchronously flipped 180° inside the second U-shaped plate 303, and the first receiving plate fixed at one end of the first rotating shaft 208 is synchronously driven. 209 and a sheet metal part positioned and fixed on the top of the first receiving plate 209 are synchronously flipped 180° inside the first U-shaped plate 203. After the two sheet metal parts synchronously complete the 180° flipping operation, the brake motor 304 is turned off, and then the lower surfaces of the welding point of the two sheet metal parts are welded by an external welding gun. During the whole process, when welding the upper and lower surfaces of the welding point of the two sheet metal parts, there is no need to disassemble the two sheet metal parts that have been preliminarily welded, which simplifies the welding process of the two sheet metal parts and improves the welding efficiency of the two sheet metal parts.

[0060] Embodiment 3, a control method for an auxiliary control system for sheet metal welding processing, includes the following control method: T1. During the use of this system, one of the sheet metal parts to be welded is horizontally pressed and placed on the top of the first receiving plate 209, and thereby a pressing operation is performed on one of the sheet metal parts to be welded, driving the two first trapezoidal moving blocks 213 away from each other until the bottom of one of the sheet metal parts to be welded contacts with the top of the first sliding column 220, and then one of the sheet metal parts to be welded continues to be pressed downward.

[0061] T2. While continuing to press one of the sheet metal parts to be welded, the two opposite side surfaces of one of the sheet metal parts to be welded continue to slide downward on the inclined surfaces of the two first trapezoidal moving blocks 213, generating an articulating rotation force on the first lifting arm 223 respectively hingedly engaged between the first displacement plate 221 and the second articulated seat 224.

[0062] T3. When the two opposite side surfaces of one of the sheet metal parts to be welded in step T2 slide out from the inclined surfaces of the two first trapezoidal moving blocks 213 and enter the bottom of the two first trapezoidal moving blocks 213, the first L-shaped clamps 219 respectively fixedly connected to the other opposite side surfaces of the first cross blocks 216 are fitted with the two opposite side surfaces of one of the sheet metal parts to be welded, thereby completing the straightening and positioning operation of one of the sheet metal parts to be welded before welding.

[0063] After steps T4, T1 to T3 are completed, the other sheet metal to be welded is horizontally pressed and placed on the top of the second receiving plate 306, and the other sheet metal to be welded is pressed to drive the two second trapezoidal moving blocks 310 away from each other until the bottom of the other sheet metal to be welded contacts the top of the second sliding column 317, and then the other sheet metal to be welded continues to be pressed downward.

[0064] T5. While continuing to press the other sheet metal part to be welded, the two opposite side surfaces of the other sheet metal part to be welded continue to slide downward on the inclined surfaces of the two second trapezoidal moving blocks 310, generating an articulating rotation force on the second lifting arm 320 respectively hingedly engaged between the second displacement plate 318 and the third articulated seat 319.

[0065] T6. When the two opposite side surfaces of the other sheet metal to be welded in step T5 slide out from the inclined surfaces of the two second trapezoidal moving blocks 310 and enter the bottom of the second trapezoidal moving blocks 310, the second L-shaped clamps 316 respectively fixedly connected to the other opposite side surfaces of the second cross blocks 313 are fitted with the two opposite side surfaces of the other sheet metal to be welded, thereby completing the straightening and positioning operation of the other sheet metal to be welded before welding.

[0066] After steps T7 and T1 to T6 are completed, the telescopic cylinder 411 is started to drive the lifting member 5 to move downward, so that the two first levers 408 that are respectively slidably engaged in the third inclined slot 505 and located on the same side are synchronously moved relative to each other in the third inclined slot 505, driving the folding plates 407 on the same side that are respectively rotatably engaged in the side surfaces of the two pin shafts 413 to rotate synchronously relative to each other, so that the first positioning member 2 and the second positioning member 3 that are slidably engaged between the two first inclined slots 405 and the two second inclined slots 406 move obliquely toward each other until the welding end surfaces of the two welded sheet metal parts that are respectively positioned and supported in the first positioning member 2 and the second positioning member 3 are fitted to each other, and then the telescopic cylinder 411 is closed.

[0067] T8. After the above steps are completed, the upper surfaces of the two sheet metal parts are welded by an external welding gun. After the welding is completed, the electric telescopic rod 205 is started to separate the rectangular plug-in block 207 from the rectangular plug-in slot, the electric telescopic rod 205 is closed, and the brake motor 304 is started to make the first positioning member 2, the second positioning member 3 and the two sheet metal parts to be welded that are positioned therein synchronously perform a 180° flip operation, so as to perform a welding operation on the lower surfaces of the two sheet metal parts to be welded.

[0068] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0069] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0070] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0072] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An auxiliary control system for sheet metal welding, comprising a welding assembly (1), characterized in that: A first positioning member (2) is slidably engaged with the welding assembly (1), and a second positioning member (3) is slidably engaged with a side of the welding assembly (1) away from the first positioning member (2); The welding assembly (1) comprises a fixing member (4) and a lifting member (5) slidably fitted inside the fixing member (4); The fixing member (4) comprises a working frame (401), and two opposite side surfaces of the working frame (401) are fixed with cross grooves (402) that are slidably matched with the lifting member (5), and the outer top of the working frame (401) is fixed with two symmetrical first side plates (403), and the outer top of the working frame (401) is fixed with two symmetrical second side plates (404) on the side away from the two first side plates (403), and the first side plates (403) and the second side plates (404) are respectively penetrated by a first inclined slide groove (405) and a second inclined slide groove (406); The first positioning member (2) is slidably disposed between the two first inclined slide grooves (405), and the second positioning member (3) is slidably disposed between the two second inclined slide grooves (406); Two symmetrical pins (413) are fixed to opposite sides of the working frame (401); a folding plate (407) is rotatably engaged with the side surface of the pins (413); a first shifting rod (408) slidably engaged with the lifting member (5) is fixed to one side of the folding plate (407); a shifting groove (409) is formed through one side of the folding plate (407); and the shifting groove (409) is slidably engaged with the first positioning member (2) and the second positioning member (3).

2. The auxiliary control system for sheet metal welding processing according to claim 1, characterized in that: A supporting base plate (410) is fixed near the bottom of the working frame (401), a telescopic cylinder (411) is fixed on the top of the supporting base plate (410), and a first connecting flange (412) is fixed on the telescopic end of the telescopic cylinder (411); The lifting member (5) comprises a second connecting flange (501) fixedly connected to the first connecting flange (412); a cross beam (502) is fixed on the top of the second connecting flange (501); cross rails (503) slidably engaged in the cross groove (402) are fixed on two opposite sides of the cross beam (502); a lifting plate (504) is fixed on the opposite sides of the two cross rails (503); two symmetrical third inclined grooves (505) are penetrated through one side of the lifting plate (504); the third inclined grooves (505) are slidably engaged with the first shifting rod (408).

3. The auxiliary control system for sheet metal welding processing according to claim 2, characterized in that: The first positioning member (2) comprises two symmetrical first T-shaped inclined slide rails (201), and the two first T-shaped inclined slide rails (201) are slidably matched with the two first inclined slide grooves (405) respectively; A second shifting rod (202) that slidably cooperates with the shifting groove (409) is fixed on opposite sides of the two first T-shaped inclined slide rails (201).

4. The auxiliary control system for sheet metal welding processing according to claim 3 is characterized in that: A first U-shaped plate (203) is fixed between the two first T-shaped inclined slide rails (201) and is slidably fitted between the two first side plates (403); a mounting frame plate (204) is fixed to the bottom of the first U-shaped plate (203); an electric telescopic rod (205) is fixed to one side of the mounting frame plate (204); a movable side plate (206) is fixed to the telescopic end of the electric telescopic rod (205); and a rectangular plug-in block (207) is fixed to one side of the movable side plate (206); The inner wall of the first U-shaped plate (203) is located inside the first U-shaped plate (203) and is rotatably matched with a first rotating shaft (208), and one end of the first rotating shaft (208) is located outside the first U-shaped plate (203) and is provided with a rectangular plug-in groove that is plug-matched with a rectangular plug-in block (207).

5. The auxiliary control system for sheet metal welding processing according to claim 4, characterized in that: A first receiving plate (209) is fixed inside the first U-shaped plate (203) opposite to the other end surface of the first rotating shaft (208), two symmetrical first vertical plates (210) are fixed on the top of the first receiving plate (209), two symmetrical first sliding rods (211) are slidably provided through the opposite side surfaces of the two first vertical plates (210), a first limiting circular plate (212) is fixed at one end of the two first sliding rods (211), and a first trapezoidal moving block (213) is fixed to the other end surface of the two first sliding rods (211); Two first springs (214) are fixed between the first trapezoidal moving block (213) and the first vertical plate (210), and are respectively sleeved and arranged on the peripheral sides of the two first sliding bars (211).

6. The auxiliary control system for sheet metal welding processing according to claim 5, characterized in that: Two symmetrical first cross grooves (215) are provided on opposite sides of the first receiving plate (209); a first cross block (216) is slidably engaged inside the first cross groove (215); a first guide rod (217) slidably engaged with the first cross block (216) is fixed to the inner wall of the first cross groove (215); a second spring (218) sleeved and engaged on the first guide rod (217) is fixed between the first cross block (216) and the first cross groove (215); and a first L-shaped clamping plate (219) located above the first guide rod (217) is fixed to one side of the first cross block (216); A first sliding column (220) is slidably provided at the center of the top of the first receiving plate (209); two symmetrical first displacement plates (221) are fixed to the bottom of the first sliding column (220) below the first receiving plate (209); two symmetrical first hinge seats (222) are fixed to opposite sides of the two first displacement plates (221); and a first lifting arm (223) is hingedly provided inside the first hinge seat (222); A second hinged seat (224) hingedly matched with the first lifting arm (223) is fixed to the bottom of the first cross block (216).

7. The auxiliary control system for sheet metal welding processing according to claim 6, characterized in that: The second positioning member (3) comprises two symmetrical second T-shaped inclined slide rails (301), and the two second T-shaped inclined slide rails (301) are respectively slidably matched with the two second inclined slide grooves (406); A third lever (302) that is slidably engaged with the toggle groove (409) is fixed on opposite sides of the two second T-shaped inclined slide rails (301); A second U-shaped plate (303) is fixed between the two second T-shaped inclined slide rails (301) and is slidably engaged between the two second side plates (404). A brake motor (304) is fixed to an outer side surface of the second U-shaped plate (303).

8. The auxiliary control system for sheet metal welding processing according to claim 7, characterized in that: A second rotating shaft (305) which is fixedly connected to the output shaft of the brake motor (304) is rotatably matched inside the second U-shaped plate (303); one end of the second rotating shaft (305) is located inside the second U-shaped plate (303) and is fixed with a second receiving plate (306); two symmetrical second vertical plates (307) are fixed on the top of the second receiving plate (306); two symmetrical second sliding rods (308) are slidably arranged through the opposite side surfaces of the two second vertical plates (307); a second limiting circular plate (309) is fixed at one end of the two second sliding rods (308); a second trapezoidal moving block (310) is fixed to the other end surface of the two second sliding rods (308); and two third springs (311) which are respectively sleeved and arranged on the peripheral side surfaces of the two second sliding rods (308) are fixed between the second trapezoidal moving block (310) and the second vertical plate (307).

9. The auxiliary control system for sheet metal welding processing according to claim 8, characterized in that: The second receiving plate (306) is provided with two symmetrical second cross grooves (312) on opposite sides, a second cross block (313) is slidably engaged inside the second cross groove (312), a second guide rod (314) slidably engaged with the second cross block (313) is fixed inside the second cross groove (312), a fourth spring (315) sleeved on the second guide rod (314) is fixed between the second cross block (313) and the second cross groove (312), and a second L-shaped clamping plate (316) located above the second guide rod (314) is fixed on one side of the second cross block (313); A second sliding column (317) is slidably provided at the center of the top of the second receiving plate (306); two symmetrical second displacement plates (318) are fixed to the bottom of the second sliding column (317) below the second receiving plate (306); two symmetrical third hinge seats (319) are fixed to the opposite sides of the two second displacement plates (318); and a second lifting arm (320) is hingedly provided inside the third hinge seat (319); A fourth hinged seat (321) hingedly matched with the second lifting arm (320) is fixed to the bottom of the second cross block (313).

10. The control method of the auxiliary control system for sheet metal welding processing according to claim 9, characterized in that: The following control methods are included: T1. During the use of the system, one of the sheet metal parts to be welded is horizontally pressed and placed on the top of the first receiving plate (209), and the sheet metal parts to be welded are pressed to drive the two first trapezoidal moving blocks (213) to move away from each other until the bottom of the sheet metal parts to be welded contacts the top of the first sliding column (220), and then the sheet metal parts to be welded are continuously pressed downward; T2, while continuing to press one of the sheet metal parts to be welded, the two opposite side surfaces of one of the sheet metal parts to be welded continue to slide downward on the inclined surfaces of the two first trapezoidal moving blocks (213), thereby generating a hinged rotation force on the first lifting arms (223) respectively hingedly engaged between the first displacement plate (221) and the second hinge seat (224); T3, when the two opposite side surfaces of one of the sheet metal parts to be welded in step T2 slide out from the inclined surfaces of the two first trapezoidal moving blocks (213) and enter the bottom of the two first trapezoidal moving blocks (213), a plurality of first L-shaped clamping plates (219) respectively fixedly connected to the other opposite side surfaces of a plurality of first cross blocks (216) are mutually fitted with the two opposite side surfaces of one of the sheet metal parts to be welded, thereby completing the straightening and positioning operation of one of the sheet metal parts to be welded before welding; After steps T4, T1 to T3 are completed, another sheet metal part to be welded is horizontally pressed and placed on the top of the second receiving plate (306), and the other sheet metal part to be welded is pressed thereby, driving the two second trapezoidal moving blocks (310) to move away from each other, until the bottom of the other sheet metal part to be welded contacts the top of the second sliding column (317), and the other sheet metal part to be welded is continuously pressed downward; T5. While continuing to press the other sheet metal part to be welded, the two opposite side surfaces of the other sheet metal part to be welded continue to slide downward on the inclined surfaces of the two second trapezoidal moving blocks (310), thereby generating a force for hinged rotation on the second lifting arms (320) respectively hingedly engaged between the second displacement plate (318) and the third hinge seat (319); T6, when the two opposite side surfaces of the other sheet metal part to be welded in step T5 slide out from the inclined surfaces of the two second trapezoidal moving blocks (310) and enter the bottom of the second trapezoidal moving blocks (310), a plurality of second L-shaped clamping plates (316) respectively fixedly connected to the other opposite side surfaces of the plurality of second cross blocks (313) are mutually fitted with the two opposite side surfaces of the other sheet metal part to be welded, thereby completing the straightening and positioning operation of the other sheet metal part to be welded before welding; After steps T7 and T1 to T6 are completed, the telescopic cylinder (411) is started to drive the lifting member (5) to move downward, so that the two first levers (408) that are respectively slidably engaged in the third inclined slot (505) and located on the same side are synchronously moved relative to each other in the third inclined slot (505), driving the folding plates (407) that are respectively rotatably engaged in the side surfaces of the two pins (413) on the same side to rotate relative to each other synchronously, so that the first positioning member (2) and the second positioning member (3) that are slidably engaged between the two first inclined slots (405) and the two second inclined slots (406) move obliquely toward each other until the welding end surfaces of the two welded sheet metal parts that are respectively positioned and supported in the first positioning member (2) and the second positioning member (3) are in contact with each other, and then the telescopic cylinder (411) is closed; T8. After the above steps are completed, the upper surfaces of the two sheet metal parts are welded by an external welding gun. After the welding is completed, the electric telescopic rod (205) is started to separate the rectangular plug-in block (207) from the rectangular plug-in slot, the electric telescopic rod (205) is closed, and the brake motor (304) is started to make the first positioning member (2), the second positioning member (3) and the two sheet metal parts to be welded that are positioned and corrected therein synchronously perform a 180° flip operation, thereby performing a welding operation on the lower surfaces of the two sheet metal parts to be welded.

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