A metal structural member welding device that facilitates marking a welding position

Abstract

The application relates to the technical field of welding, and discloses a metal structural part welding device facilitating marking of welding positions, a plurality of slits are formed in two steel pipes; the device comprises a welding mechanism, a marking mechanism and a driving mechanism, the marking mechanism comprises a shell, rollers are arranged on the shell, the welding mechanism comprises a welding torch and a first ball valve arranged on the shell, acetylene conveying pipelines and gas supply pipelines are arranged at the two ends of the first ball valve, and the acetylene conveying pipelines are connected with the welding torch; and the marking mechanism further comprises a control assembly. The metal structural part welding device facilitating marking of welding positions can automatically mark non-welding positions provided with slits when local welding is performed on two metal structural parts, the welding torch can be automatically opened and closed through the marked positions, manual marking is avoided, and the welding efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of welding technology, specifically to a welding device for metal structural components that facilitates marking welding positions. Background Technology

[0002] When welding two metal structural components, such as steel pipes, together, welding equipment such as electric arc welding, gas welding, or plasma welding is required. For example, acetylene welding equipment uses a welding torch burning acetylene to weld around the joint of the two steel pipes.

[0003] In addition to welding two steel pipes together completely, some welding operations require welding only on specific areas of the two pipes. For example, for some irregularly shaped steel pipes, several slots need to be left at the joint, penetrating the inner and outer walls of the pipe. Welding is not performed at the slots, but at the non-slot areas.

[0004] Welding can be done manually or automatically. When using automated welding equipment, for partial welding of two steel pipes, manual marking of the welding and non-welding areas is required, which reduces welding efficiency. Summary of the Invention

[0005] This invention provides a metal structural component welding device that facilitates marking welding positions. When performing partial welding on two metal structural components, it can automatically mark the non-welding positions with slots, and control the automatic opening and closing of the welding torch by the marked positions, thereby eliminating the need for manual marking and improving welding efficiency. This solves the problem mentioned in the background art that, for partial welding of two steel pipes, manual marking of the welding and non-welding areas is required, which reduces welding efficiency.

[0006] The present invention provides the following technical solution: a metal structural component welding device for easy marking of welding positions, used for welding two steel pipes, both of which have several slots. It also includes a welding mechanism, a marking mechanism, and a driving mechanism. The marking mechanism includes a housing with rollers on it. The welding mechanism includes a welding torch and a first ball valve mounted on the housing. An acetylene delivery pipe and a gas supply pipe are respectively mounted on both ends of the first ball valve, and the acetylene delivery pipe is connected to the welding torch. The marking mechanism also includes a control component that drives the two steel pipes to rotate via the drive mechanism, rolls along the joint of the two steel pipes via the roller, marks the non-joint area as a welding position, and marks the joint area as a non-welding position. The control component controls the first ball valve to open in the welding position and close in the non-welding position.

[0007] As an optional embodiment of the metal structural welding device for easy marking of welding positions described in this invention, it further includes a worktable, wherein the worktable includes two three-jaw chucks, and the two three-jaw chucks are respectively used to fix the two steel pipes; The workbench is provided with a first slide groove, and a slide block is slidably disposed in the first slide groove. The housing is disposed on the slide block. The driving mechanism includes two first turntables rotatably mounted on the worktable, two three-jaw chucks respectively mounted on the two first turntables, and two motors symmetrically mounted on the worktable, with the output shafts of the two motors respectively connected to the two first turntables.

[0008] As an optional embodiment of the metal structural welding device for easy marking of welding positions according to the present invention, the first ball valve includes a valve seat disposed on the housing, a valve stem rotatably disposed within the valve seat, and a valve core disposed on the valve stem.

[0009] As an optional embodiment of the metal structural welding device for easy marking of welding positions described in this invention, wherein: an oxygen delivery pipe is provided on the welding torch, a welding flux container is provided on the housing, a second ball valve is provided on the welding flux container, and the first ball valve is connected to the second ball valve via a belt drive device.

[0010] As an optional embodiment of the metal structural welding device for facilitating the marking of welding positions according to the present invention, the marking mechanism further includes a first lifting seat slidably disposed on the housing, the first lifting seat being elastically connected to the housing via a spring, a second lifting seat slidably disposed on the first lifting seat, and a roller being rotatably connected to the second lifting seat.

[0011] As an optional solution of the metal structural welding device for easy marking of welding positions according to the present invention, the control component includes a second turntable rotatably disposed on the housing, the second turntable having a plurality of discs arranged circumferentially, each of the discs being provided with a sliding rod, the second turntable having a plurality of second sliding grooves circumferentially opened, and the plurality of sliding rods being slidably connected to the plurality of second sliding grooves respectively. The first lifting seat is equipped with a push rod, and the valve stem is equipped with a wing plate.

[0012] As an optional embodiment of the metal structural welding device for easy marking of welding positions according to the present invention, wherein: a first connecting rod is provided on the first turntable, and a second connecting rod is provided on the second turntable, the second connecting rod being slidably connected to the first connecting rod.

[0013] As an optional embodiment of the metal structural welding device for easy marking of welding positions according to the present invention, wherein: the control component further includes a fixing component, the fixing component being used to fix the positions of the plurality of disks; The fixing component includes several screws respectively disposed on several of the discs, and each of the screws is threaded with a nut.

[0014] As an optional embodiment of the metal structural welding device for easy marking of welding positions according to the present invention, the fixing component further includes a first arc-shaped rack and a second arc-shaped rack disposed on the housing, and a plurality of nuts are provided with gears.

[0015] As an optional embodiment of the metal structural welding device for facilitating the marking of welding positions according to the present invention, the marking mechanism further includes a connecting component, wherein the first lifting seat and the second lifting seat are connected through the connecting component; The connecting assembly includes a rotating groove formed on the second lifting seat, a rotating rod rotatably disposed in the rotating groove, the rotating rod being provided with external threads, and the first lifting seat being provided with internal threads.

[0016] The present invention has the following beneficial effects: 1. This metal structural welding device, which facilitates marking welding positions, utilizes rollers that circumferentially encircle the surface of two steel pipes to measure the joint. The rollers rise and fall based on the height variations between the non-seam and seam areas on the pipe surface. These roller movements mark the non-seam areas as welding zones and the seam areas as non-welding zones. The device automatically controls the gas supply to the welding torch and the opening and closing of the welding flux container during the welding process based on these markings. This eliminates the need for manual marking and improves welding efficiency.

[0017] 2. This metal structural welding device, which facilitates marking welding positions, utilizes the lifting and lowering of rollers to control the sliding and changing position of a circular disc. After positioning the disc near and away from the center, a wing plate connected to the valve stem of the first ball valve is positioned between the two disc heights. This allows the wing plate to rotate clockwise or counterclockwise depending on its contact with the disc at different positions, thereby controlling the opening and closing of the first ball valve, and consequently controlling the supply of acetylene gas to the welding torch.

[0018] 3. This metal structural welding device, which facilitates marking welding positions, has a second ball valve installed on the welding flux tank. The second ball valve is connected to the first ball valve via a belt drive, and the two valve stems rotate synchronously. When the welding torch flame is turned off, the welding flux tank also stops dispensing welding flux. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a cross-sectional view of the overall structure of the present invention.

[0021] Figure 3 For the present invention Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0022] Figure 4 For the present invention Figure 3 A magnified schematic diagram of the structure at point B in the middle.

[0023] Figure 5 This is an exploded structural diagram of the driving mechanism in this invention.

[0024] Figure 6 This is a schematic diagram of the exploded structure of the marking mechanism in this invention.

[0025] Figure 7 This is a schematic diagram of the control component in this invention.

[0026] Figure 8 This is an exploded structural diagram of the control component in this invention.

[0027] Figure 9 This is a schematic diagram illustrating the first working principle of the present invention.

[0028] Figure 10 This is a schematic diagram of the second working principle of the present invention.

[0029] In the diagram: 100, steel pipe; 110, slot; 200, workbench; 210, three-jaw chuck; 220, first slide rail; 230, slide block; 300, welding mechanism; 310, welding torch; 320, acetylene delivery pipeline; 330, first ball valve; 331, valve seat; 332, valve stem; 333, valve core; 340, gas supply pipeline; 350, oxygen delivery pipeline; 360, welding flux container; 370, second ball valve; 380, belt drive device; 400, marking mechanism; 410, housing; 420, roller; 430, control component; 431, second turntable; 432. 433. Disc; 434. Slide rod; 435. Second slide groove; 436. Push rod; 437. Wing plate; 438. Fixing assembly; 4371. Screw; 4372. Nut; 4373. Gear; 4374. First arc-shaped rack; 4375. Second arc-shaped rack; 440. First lifting seat; 450. Spring; 460. Second lifting seat; 470. Connecting assembly; 471. Rotary groove; 472. Rotating rod; 473. External thread; 474. Internal thread; 500. Drive mechanism; 510. First turntable; 520. Motor; 530. First connecting rod; 540. Second connecting rod. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1, please refer to Figures 1-5 A welding device for metal structural components that facilitates marking welding positions, used for welding two steel pipes 100, each of which has several slots 110.

[0032] It also includes a welding mechanism 300, a marking mechanism 400 and a driving mechanism 500. The marking mechanism 400 includes a housing 410 and a roller 420 on the housing 410. The welding mechanism 300 includes a welding torch 310 and a first ball valve 330 on the housing 410. The two ends of the first ball valve 330 are respectively provided with an acetylene delivery pipe 320 and a gas supply pipe 340, and the acetylene delivery pipe 320 is connected to the welding torch 310.

[0033] The marking mechanism 400 also includes a control component 430, which drives the two steel pipes 100 to rotate via the drive mechanism 500, rolls along the joint of the two steel pipes 100 via rollers 420, marks the non-joint area as the welding position, and marks the joint 110 area as the non-welding position.

[0034] The first ball valve 330 is controlled by the control component 430 to open in the welding position and close in the non-welding position.

[0035] It also includes a worktable 200, which includes two three-jaw chucks 210, which are used to fix two steel pipes 100 respectively.

[0036] The workbench 200 has a first slide groove 220, and a slide block 230 is slidably disposed in the first slide groove 220. The housing 410 is disposed on the slide block 230.

[0037] The drive mechanism 500 includes two first turntables 510 rotatably mounted on the worktable 200, two three-jaw chucks 210 respectively mounted on the two first turntables 510, and two motors 520 symmetrically mounted on the worktable 200, with the output shafts of the two motors 520 respectively connected to the two first turntables 510.

[0038] In this embodiment, two steel pipes 100 are welded as metal structural components. The steel pipes 100 shown in the figure have two slots 110, but the actual number can be any.

[0039] The three-jaw chuck 210 can be an electric chuck or a manual chuck. First, align the four slots 110 on the steel pipe 100, and then use two three-jaw chucks 210 to fix the two steel pipes 100 in place. Then, pull the slide 230 and the housing 410 to the right position shown in the figure, so that the roller 420 is aligned with the joint of the two steel pipes 100.

[0040] Two motors 520 operate synchronously, driving two first turntables 510 to rotate counterclockwise, which in turn drives two three-jaw chucks 210 and two steel pipes 100 to rotate counterclockwise. The roller 420 rotates clockwise around the joint of the two steel pipes 100, and the roller 420 can rotate under friction.

[0041] Roller 420 rolls in close contact with the surfaces of the two steel pipes 100. When roller 420 contacts the non-slit areas on the two steel pipes 100, roller 420 is in the upper position; when roller 420 contacts the slit area 110, roller 420 descends. When roller 420 is in the upper position, the corresponding surface area of ​​steel pipe 100 is marked as a welding position; when roller 420 is in the lower position, the corresponding surface area of ​​steel pipe 100 is marked as a non-welding position.

[0042] After marking, drag the slide 230 and housing 410 to the left so that the welding torch 310 is aligned with the joint of the two steel pipes 100. The gas supply pipe 340 can be connected to an acetylene cylinder. Open the acetylene cylinder valve to allow acetylene gas to pass through the gas supply pipe 340, the first ball valve 330, and the acetylene delivery pipe 320 to reach the welding torch 310 and react with oxygen to generate a high-temperature flame to weld the joint of the two steel pipes 100. At the same time, the two steel pipes 100 are rotated counterclockwise by two motors 520 to form a weld and connect the two steel pipes 100 together.

[0043] During the counterclockwise rotation of the two steel pipes 100, the first ball valve 330 is open in the welding position and closed in the non-welding position. This ensures that welding is performed only on the non-slit areas, and the flame is turned off when the welding torch 310 is aligned with the slit area 110.

[0044] The specific structure and working principle of the three-jaw chuck 210 and welding torch 310 are conventional technical means and will not be elaborated upon.

[0045] Example 2 is an improvement upon Example 1. For details, please refer to [link / reference]. Figures 1-8 The first ball valve 330 includes a valve seat 331 disposed on the housing 410, a valve stem 332 rotatably disposed inside the valve seat 331, and a valve core 333 disposed on the valve stem 332.

[0046] The welding torch 310 is equipped with an oxygen delivery pipe 350, the casing 410 is equipped with a welding flux tank 360, the welding flux tank 360 is equipped with a second ball valve 370, and the first ball valve 330 is connected to the second ball valve 370 through a belt drive device 380.

[0047] In this embodiment: one end of the valve seat 331 is connected to the gas supply pipeline 340, and the other end of the valve seat 331 is connected to the acetylene delivery pipeline 320. By controlling the rotation of the valve core 333 within the valve seat 331, the valve seat 331 can be switched between closed and open states. The valve stem 332 connected to the valve core 333 extends to the left and out of the valve seat 331.

[0048] Oxygen supply pipe 350 can be connected to an oxygen cylinder to supply oxygen to welding torch 310. In addition to welding torch 310, welding wire or flux is also required during welding; flux is used here to assist welding. A flux container 360 is installed at the rear of welding torch 310, storing welding flux. The specific material of the flux can be selected according to the material of steel pipe 100 and welding requirements. A second ball valve 370 is installed at the lower end of flux container 360.

[0049] The structure of the second ball valve 370 is the same as that of the first ball valve 330. The structure of the corresponding valve stem 332 in the second ball valve 370 is connected to the valve stem 332 itself through a belt drive device 380. The belt drive device 380 includes pulleys respectively installed on the two valve stems 332 and a belt between the two pulleys.

[0050] When the welding torch 310 and the flux container 360 move relative to each other to the area of ​​the corresponding welding position, the first ball valve 330 and the second ball valve 370 are both in the open state. At this time, the flux in the flux container 360 is sprayed onto the joint of the two steel pipes 100 through the second ball valve 370. Then the flame of the welding torch 310 passes through the flux and the joint to form a weld.

[0051] When the welding torch 310 and the flux container 360 move relative to each other to the area corresponding to the welding position, the first ball valve 330 is controlled by the control component 430 to rotate the valve stem 332 to close the first ball valve 330, and the second ball valve 370 also closes simultaneously to stop spraying flux.

[0052] Example 3 is an improvement upon Example 2. For details, please refer to [link / reference]. Figures 1-10 The marking mechanism 400 also includes a first lifting seat 440 slidably disposed on the housing 410. The first lifting seat 440 is elastically connected to the housing 410 by a spring 450. A second lifting seat 460 is slidably disposed on the first lifting seat 440, and a roller 420 is rotatably connected to the second lifting seat 460.

[0053] The control component 430 includes a second turntable 431 rotatably mounted on the housing 410. The second turntable 431 has a plurality of discs 432 arranged circumferentially. Each of the discs 432 is provided with a slide rod 433. The second turntable 431 has a plurality of second slide grooves 434 arranged circumferentially. The slide rods 433 are slidably connected to the plurality of second slide grooves 434 respectively.

[0054] A push rod 435 is provided on the first lifting seat 440, and a wing plate 436 is provided on the valve stem 332.

[0055] One of the first turntables 510 is provided with a first connecting rod 530, and the second turntable 431 is provided with a second connecting rod 540, which is slidably connected to the first connecting rod 530.

[0056] In this embodiment, the spring 450 exerts a downward elastic force on the first lifting seat 440 and the second lifting seat 460, causing the roller 420 to tend to move downward. When the roller 420 contacts the non-slit area on the steel pipe 100, the spring 450 is in a compressed state. When the roller 420 moves relative to the slit 110 area, the roller 420 is ejected downward under the elastic force of the spring 450. The roller 420 is then embedded in the slit 110. When it rotates counterclockwise to the end of the slit 110 area, the roller 420 rolls out of the slit 110 and contacts the surface of the steel pipe 100 again.

[0057] The second turntable 431 is coaxial with the steel pipe 100, and the second turntable 431 is as follows: Figure 7 A circular disc 432 is installed as shown. A second sliding groove 434 is formed on the second rotating disc 431, running horizontally through it. The second sliding groove 434 is distributed along the radial direction of the second rotating disc 431. The disc 432 is limited by the sliding rod 433 and slides only in the radial direction of the second rotating disc 431. The initial position of the push rod 435 is as shown. Figure 9 As shown, it is located between the two disks 432 on the upper side. In the initial state, all disks 432 are located close to the center of the steel pipe 100.

[0058] When the roller 420 contacts the non-slotted area on the steel pipe 100, the first lifting seat 440 and the push rod 435 are in the upper position. At this time, when the circular disc 432 rotates counterclockwise, each disc 432 that passes the push rod 435 will be pushed upward by the push rod 435. That is, the disc 432 at the welding mark position is located away from the center of the steel pipe 100.

[0059] When the roller 420 rolls relative to the slot 110 area, the first lifting seat 440 and the push rod 435 are in the lower position. At this time, each disc 432 passing the push rod 435 will not contact the push rod 435. That is, the disc 432 in the non-welding mark position is located near the center of the steel pipe 100.

[0060] The final circle of disks is distributed as follows: Figure 9 As shown, the corresponding ring of sliders 433 is also distributed in the same way.

[0061] The wing plate 436 connected to the valve stem 332 is initially as follows: Figure 10 The leftmost state distribution is shown, where the position of valve core 333 causes valve seat 331 to be in the open state. It is assumed that the disc 432, which is in a non-welded position, will be in contact with the wing plate 436 at this moment.

[0062] like Figure 10 The leftmost wing plate 436 will contact the sliding rod 433 located on the left side near the center of the steel pipe 100. At this time, the lower end of the wing plate 436 is abutted by the sliding rod 433, and the sliding rod 433 pushes the wing plate 436 to rotate clockwise until it reaches the middle position. At this time, the valve core 333 rotates to make the valve seat 331 closed. Correspondingly, in the area of ​​the slot 110, the welding torch 310 shuts off the flame, and the welding flux canister 360 does not spray welding flux.

[0063] The next contact between the wing plate 436 and the slide rod 433, which is in the welding position, is set. For example... Figure 10 The central wing plate 436 contacts the sliding rod 433 located on the right side, away from the center of the steel pipe 100. At this time, the upper end of the wing plate 436 is abutted by the sliding rod 433, which pushes the wing plate 436 to rotate counterclockwise until it reaches the right-side wing plate position. Simultaneously, the valve core 333 rotates counterclockwise until the valve seat 331 is in the open position. Correspondingly, in the non-slit area, the welding torch 310 ignites the flame, and the welding flux canister 360 sprays welding flux.

[0064] Example 4 is an improvement upon Example 3. For details, please refer to [link / reference]. Figures 2-8 The control component 430 also includes a fixing component 437, which is used to fix the positions of several disks 432.

[0065] The fixing component 437 includes a plurality of screws 4371 respectively disposed on a plurality of discs 432, and each of the plurality of screws 4371 is threadedly connected with a nut 4372.

[0066] The fixing component 437 also includes a first arc-shaped rack 4374 and a second arc-shaped rack 4375 disposed on the housing 410, and a gear 4373 disposed on each of the nuts 4372.

[0067] In this embodiment: after each disk 432 is pushed to the upper position by the push rod 435, or remains in the lower position without contacting the push rod 435, the position of each disk 432 needs to be fixed so that each slide rod 433 can correspondingly push the wing plate 436 to rotate clockwise or counterclockwise.

[0068] Specifically, a certain sliding friction force can be set between the disc 432 and the second turntable 431 to fix the position of the disc 432. A fixing component 437 can also be added.

[0069] When the disc 432 is not pushed by the push rod 435 and is in the lower position, the gear 4373 is in the lower position and engages with the first arc-shaped rack 4374 when rotating counterclockwise, causing the gear 4373 and the nut 4372 to rotate clockwise. The nut 4372 moves to the right in a spiral motion until it contacts the left end of the second turntable 431, thus fixing the position of the screw 4371 and the disc 432.

[0070] When the disc 432 is pushed to the upper position by the push rod 435, it engages with the second arc-shaped rack 4375 when rotating counterclockwise, causing the gear 4373 and the nut 4372 to rotate clockwise. The nut 4372 moves to the right in a spiral motion until it contacts the left end of the second turntable 431, thus fixing the position of the screw 4371 and the disc 432.

[0071] Example 5 is an improvement upon Example 4. For details, please refer to [link / reference]. Figures 2-7 The marking mechanism 400 also includes a connecting component 470, through which the first lifting seat 440 and the second lifting seat 460 are connected.

[0072] The connecting assembly 470 includes a rotating groove 471 formed on the second lifting seat 460, a rotating rod 472 rotatably disposed in the rotating groove 471, an external thread 473 provided on the rotating rod 472, and an internal thread 474 formed in the first lifting seat 440.

[0073] In this embodiment: Considering the variation in the diameter of the steel pipe 100, the position of the second lifting seat 460 can be adjusted to keep the roller 420 in contact with the surface of the steel pipe 100. Specifically, the first lifting seat 440 can be raised or lowered relative to the housing 410 by rotating forward and backward 372.

[0074] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0075] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A welding device for metal structural components that facilitates marking welding positions, used for welding two steel pipes (100), characterized in that: Both of the steel pipes (100) have several slots (110) opened on them; It also includes a welding mechanism (300), a marking mechanism (400), and a driving mechanism (500). The marking mechanism (400) includes a housing (410) on which rollers (420) are provided. The welding mechanism (300) includes a welding torch (310) and a first ball valve (330) on the housing (410). Acetylene delivery pipe (320) and gas supply pipe (340) are respectively provided at both ends of the first ball valve (330). The acetylene delivery pipe (320) is connected to the welding torch (310). The marking mechanism (400) further includes a control component (430) that drives the two steel pipes (100) to rotate via the drive mechanism (500), rolls along the joint of the two steel pipes (100) via the roller (420), marks the non-joint (110) area as the welding position, and marks the joint (110) area as the non-welding position; The control component (430) controls the first ball valve (330) to open in the welding position and close in the non-welding position; The first ball valve (330) includes a valve seat (331) disposed on the housing (410), a valve stem (332) rotatably disposed inside the valve seat (331), and a valve core (333) disposed on the valve stem (332). The marking mechanism (400) further includes a first lifting seat (440) slidably disposed on the housing (410), the first lifting seat (440) being elastically connected to the housing (410) by a spring (450), a second lifting seat (460) being slidably disposed on the first lifting seat (440), and a roller (420) being rotatably connected to the second lifting seat (460); The control component (430) includes a second turntable (431) rotatably mounted on the housing (410). The second turntable (431) has a plurality of discs (432) arranged circumferentially. Each of the discs (432) is provided with a slide rod (433). The second turntable (431) has a plurality of second slide grooves (434) arranged circumferentially. The slide rods (433) are slidably connected to the plurality of second slide grooves (434). A push rod (435) is provided on the first lifting seat (440), and a wing plate (436) is provided on the valve stem (332).

2. The welding device for metal structural parts that facilitates marking welding positions according to claim 1, characterized in that: It also includes a workbench (200), which includes two three-jaw chucks (210), which are used to fix the two steel pipes (100) respectively. The workbench (200) is provided with a first slide groove (220), and a slide block (230) is slidably disposed in the first slide groove (220). The housing (410) is disposed on the slide block (230). The drive mechanism (500) includes two first turntables (510) rotatably mounted on the worktable (200), two three-jaw chucks (210) respectively mounted on the two first turntables (510), and two motors (520) symmetrically mounted on the worktable (200), with the output shafts of the two motors (520) respectively connected to the two first turntables (510).

3. The welding device for metal structural parts that facilitates marking welding positions according to claim 1, characterized in that: The welding torch (310) is provided with an oxygen delivery pipe (350), the shell (410) is provided with a welding flux tank (360), the welding flux tank (360) is provided with a second ball valve (370), and the first ball valve (330) is connected to the second ball valve (370) through a belt drive device (380).

4. The welding device for metal structural parts that facilitates marking welding positions according to claim 2, characterized in that: One of the first turntables (510) is provided with a first connecting rod (530), and the second turntable (431) is provided with a second connecting rod (540), and the second connecting rod (540) is slidably connected to the first connecting rod (530).

5. The welding device for metal structural parts that facilitates marking welding positions according to claim 1, characterized in that: The control component (430) further includes a fixing component (437) for fixing the positions of the plurality of disks (432); The fixing component (437) includes a plurality of screws (4371) respectively disposed on a plurality of discs (432), and each of the plurality of screws (4371) is threaded with a nut (4372).

6. A welding device for metal structural components that facilitates marking welding positions according to claim 5, characterized in that: The fixing component (437) further includes a first arc-shaped rack (4374) and a second arc-shaped rack (4375) disposed on the housing (410), and a gear (4373) is disposed on each of the nuts (4372).

7. The welding device for metal structural parts that facilitates marking welding positions according to claim 1, characterized in that: The marking mechanism (400) further includes a connecting component (470), through which the first lifting seat (440) and the second lifting seat (460) are connected; The connecting assembly (470) includes a rotating groove (471) opened on the second lifting seat (460), a rotating rod (472) is rotatably arranged in the rotating groove (471), the rotating rod (472) is provided with an external thread (473), and the first lifting seat (440) is provided with an internal thread (474).

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