A laser welding device for hydraulic cylinder accessory machining

Abstract

The application relates to the technical field of laser welding, in particular to a laser welding device for hydraulic cylinder accessory machining. The device comprises a main body frame, the main body frame is provided with a top first machining platform, the bottom of the first machining platform is fixedly connected with a second machining platform, and a calibration mechanism is arranged at the second machining platform. The calibration mechanism comprises a plurality of first connecting columns fixedly connected to the top of the first machining platform, the top of the plurality of first connecting columns is fixedly connected with a calibration disc, the top of the calibration disc is placed with a to-be-welded flange, the to-be-welded flange is provided with a sealing groove, and the calibration disc is provided with a calibration groove in communication with the sealing groove. The calibration mechanism further comprises an adjusting rod rotatably arranged in the middle of the second machining platform, and a calibration piece is slidably arranged on the outer wall of the adjusting rod in the height direction. Compared with the prior art, the calibration block is deeply arranged in the sealing groove of the to-be-welded flange, the to-be-welded flange is accurately positioned at the central part of the calibration disc, the uniformity of force of the to-be-welded flange during subsequent clamping is improved, and therefore the stability of the to-be-welded flange during subsequent clamping is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser welding, in particular to a laser welding device for hydraulic cylinder accessory machining. BACKGROUND

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or oscillating motion). The hydraulic cylinder is simple in structure and reliable in operation. When it is used to realize reciprocating motion, the speed reduction device can be omitted, and there is no transmission gap, so the motion is stable. Therefore, it is widely used in various mechanical hydraulic systems. Laser welding focuses high-energy-density laser beams on the material surface, causing the material to melt rapidly to form a molten pool, achieving precise connection. There is a flange in the cylinder accessory, and the flange needs to be laser welded during the assembly of the hydraulic cylinder. The flange needs to be clamped and positioned before laser welding.

[0003] A welding device for hydraulic cylinder accessory machining is disclosed in publication No. CN116275761B. The present application relates to the technical field of hydraulic equipment, which comprises a welding part and a supporting base. The welding part is installed on the side wall of the supporting base. The side wall of the supporting base is fixed with a horizontally placed bracket. The bracket is installed with a driving assembly and a clamping part. The driving assembly is movably connected with the side wall of the clamping part. The clamping part includes a face disc, a bottom frame and a locking linkage assembly. The locking linkage assembly includes a knob, a transition cylinder, a limiting ring, a fan plate and a rack. The welding device for hydraulic cylinder accessory machining can simultaneously tighten the multiple buckles symmetrically distributed in the clamping part. The tightening degree of the buckle is adjustable, which is suitable for a wide range. Only the parts need to be pulled down and rotated, and the workpiece can be released by rotating the parts. The device is convenient and does not require many electrical equipment.

[0004] In the above-mentioned comparative document, when placing and clamping the flange and other hydraulic cylinder accessories, manual placement is used. The flange is difficult to accurately stay in the center position of the clamping part, which may cause deviation when the flange is clamped by the clamp, thereby affecting the stability of the flange clamped by the clamp. Therefore, we propose a laser welding device for hydraulic cylinder accessory machining to solve this technical defect. SUMMARY

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a laser welding device for hydraulic cylinder accessory machining, comprising a main body frame, the main body frame having a top first machining platform, the first machining platform being fixedly connected at the bottom with a second machining platform, a calibration mechanism being arranged at the second machining platform;

[0006] The calibration mechanism comprises a plurality of first connecting columns fixedly connected to the top of the first machining platform, a calibration disc being fixedly connected at the top of the plurality of first connecting columns, a to-be-welded flange being placed at the top of the calibration disc, the to-be-welded flange having a sealing groove, the calibration disc having a calibration groove in communication with the sealing groove;

[0007] The calibration mechanism further comprises an adjusting rod rotatably arranged in the middle of the second machining platform, and a calibration piece slidingly arranged on the outer wall of the adjusting rod in the height direction;

[0008] The calibration piece comprises a moving disc threadedly connected to the lower part of the outer wall of the adjusting rod, a plurality of second connecting columns equidistantly arranged on the top of the outer wall of the moving disc, a combination disc fixedly connected to the top of the outer wall of the second connecting columns, a calibration block penetrating through the calibration groove and extending into the sealing groove, and a driving motor fixedly connected to the bottom of the adjusting rod.

[0009] The calibration block is in the shape of a right trapezoid, and the side away from the center point of the combination disc is an inclined side.

[0010] A communication groove is arranged in the middle of the outer wall of the first machining platform for the adjusting rod and the second connecting columns to penetrate through, and a first moving groove is arranged around the communication groove on the top of the first machining platform, the calibration mechanism further comprises a moving shell fixedly connected to the upper surface of the first machining platform and located on both sides of the first moving groove, a moving block slidingly arranged in the first moving groove, the moving block having a first docking portion, a plurality of second docking portions equidistantly arranged on the outer wall of the moving disc, and a connecting plate rotatably arranged at the first docking portion and rotatably connected to the second docking portions.

[0011] A clamping mechanism is arranged at the moving block, the clamping mechanism comprising an installation plate fixedly connected to the top of the moving block, a square column extending in the height direction fixedly arranged on the top of the installation plate, a second moving groove in communication with the outside in the width direction arranged in the upper part of the outer wall of the square column, a horizontal limiting plate boltedly connected to the inner wall of the second moving groove, and a horizontal limiting portion formed at the end of the horizontal limiting plate away from the second moving groove and in contact with the side wall of the flange to be welded.

[0012] Further, an adjusting groove is arranged in the top of the inner wall of the second moving groove, a guide column is slidingly arranged in the adjusting groove, a vertical limiting plate is slidingly arranged on the top of the inner wall of the second moving groove and located at the top of the horizontal limiting plate, the vertical limiting plate has a vertical limiting portion in contact with the top of the outer wall of the flange to be welded, a connecting disc is fixedly connected to the bottom of the outer wall of the guide column and rotatably connected to the top of the vertical limiting plate, and a spring is sleeved on the outer wall of the guide column.

[0013] Further, a rotary cover is rotatably connected to the top of the square column close to the adjusting groove, the rotary cover has a communication hole for the guide column to slide through, a guide groove slidingly arranged on the upper part of the outer wall of the guide column in the height direction, annular grooves arranged on both sides of the guide groove, and an extension protrusion arranged on the inner side of the communication hole and slidingly connected to the guide groove and the annular grooves.

[0014] Further, a bending plate is connected to both sides of the end of the vertical limiting plate away from the vertical limiting portion, the bending plate has an extension portion, and a telescopic assembly is rotatably arranged between the extension portions of adjacent bending plates.

[0015] Further, the telescopic assembly comprises two rotating bars rotationally connected to the adjacent extension portions, and a telescopic groove is formed in the outer wall of the two rotating bars, and a connecting bar is slidably arranged between the telescopic grooves of the two rotating bars, and the end of the connecting bar is fixedly connected with a mounting bolt.

[0016] Further, the first machining platform and the second machining platform jointly form a recess. Beneficial effects

[0017] Compared with the prior art, the laser welding device for hydraulic cylinder accessory machining has the following beneficial effects:

[0018] 1. The calibration block on the combined disc can be deeply inserted into the calibration groove, and since the calibration block is a right trapezoid, the calibration block can be deeply inserted into the sealing groove of the to-be-welded flange. The calibration block is slid upward, so that the inclined edge of the calibration block is in contact with the inner wall of the sealing groove, thereby driving the to-be-welded flange to slide on the surface of the calibration disc and guiding the to-be-welded flange to the central part of the calibration disc. Compared with the prior art, the to-be-welded flange is accurately positioned at the central part of the calibration disc by being deeply inserted into the sealing groove of the to-be-welded flange, thereby improving the uniformity of the force received by the to-be-welded flange during subsequent clamping, and the stability of the clamping of the to-be-welded flange is improved.

[0019] 2. The connecting plate on the second abutting part can be rotated, thereby driving the moving block on the first abutting part to slide on the moving shell, so that the moving block slides towards the communication groove. The square column connected with the moving shell through the mounting plate can approach the to-be-welded flange, so that the transverse limiting part on the transverse limiting plate is in contact with the to-be-welded flange and multi-directionally clamps and fixes the to-be-welded flange in the width direction.

[0020] 3. The worker lifts the vertical limiting plate to adjust its position, the telescopic assembly drives the adjacent two vertical limiting plates to move synchronously, thereby driving multiple vertical limiting plates to move synchronously. The position of other vertical limiting plates can be adjusted synchronously by rotating the corresponding rotating cover of the single vertical limiting plate to position the single vertical limiting plate. Only the rotating cover corresponding to the other vertical limiting plate needs to be rotated, and the vertical limiting plate does not need to be lifted again, thereby simplifying the operation of fixing multiple vertical limiting plates. When the square column moves, the rotating bar on the extension portion rotates, and the mounting bolt on the connecting bar slides in the telescopic groove, thereby ensuring that the square column can normally move and ensuring that multiple vertical limiting plates are connected with each other. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The present application provides a kind of laser welding device for hydraulic cylinder accessory machining as a whole schematic view;

[0022] Figure 2 It is a kind of hydraulic cylinder accessory processing laser welding device overall side section view schematic diagram proposed in the present application;

[0023] Figure 3 It is a kind of hydraulic cylinder accessory processing laser welding device first processing platform, mobile shell and mobile block position schematic diagram proposed in the present application;

[0024] Figure 4 It is a kind of hydraulic cylinder accessory processing laser welding device adjusting rod, flange to be welded and square column schematic diagram proposed in the present application;

[0025] Figure 5 It is a kind of hydraulic cylinder accessory processing laser welding device calibration piece schematic diagram proposed in the present application;

[0026] Figure 6 It is a kind of hydraulic cylinder accessory processing laser welding device moving disc, second connecting column and combination disc position schematic diagram proposed in the present application;

[0027] Figure 7 It is a kind of hydraulic cylinder accessory processing laser welding device square column schematic diagram proposed in the present application;

[0028] Figure 8 It is a kind of hydraulic cylinder accessory processing laser welding device square column, vertical limiting plate and rotating cover schematic diagram proposed in the present application;

[0029] Figure 9 It is a kind of hydraulic cylinder accessory processing laser welding device square column side section view schematic diagram proposed in the present application;

[0030] Figure 10 It is a kind of hydraulic cylinder accessory processing laser welding device guide column and rotating cover position schematic diagram proposed in the present application;

[0031] Figure 11 It is a kind of hydraulic cylinder accessory processing laser welding device telescopic assembly split schematic diagram proposed in the present application.

[0032] In the figure: 100, main body frame; 110, first processing platform; 111, communication groove; 112, first moving groove; 120, second processing platform; 130, recess; 200, calibration mechanism; 210, first connecting column; 220, calibration disc; 221, calibration groove; 230, to-be-welded flange; 231, sealing groove; 240, adjusting rod; 250, calibration piece; 251, moving disc; 252, second connecting column; 253, combined disc; 254, calibration block; 255, driving motor; 256, second butt joint part; 260, moving shell; 261, moving block; 262, first butt joint part; 263, connecting plate; 300, clamping mechanism; 310, mounting plate; 320, square column; 321, second moving groove; 322, adjusting groove; 330, transverse limiting plate; 331, transverse limiting part; 340, guide column; 341, connecting disc; 342, guide groove; 343, annular groove; 350, vertical limiting plate; 351, vertical limiting part; 352, spring; 353, extension part; 354, bent plate; 360, rotary cover; 361, communication hole; 362, extension protrusion; 370, telescopic assembly; 371, rotating strip; 372, telescopic groove; 373, connecting strip; 374, mounting bolt. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0034] Please refer to Figures 1 to 8 A laser welding device for hydraulic cylinder accessory machining includes a main body frame 100, the main body frame 100 has a top first processing platform 110, the first processing platform 110 is fixedly connected with a second processing platform 120 at the bottom, and a calibration mechanism 200 is arranged at the second processing platform 120.

[0035] The calibration mechanism 200 includes a plurality of first connecting columns 210 fixedly connected to the top of the first processing platform 110, a calibration disc 220 fixedly connected to the top of the plurality of first connecting columns 210, and a to-be-welded flange 230 placed on the top of the calibration disc 220, wherein the to-be-welded flange 230 has a sealing groove 231, the calibration disc 220 has a calibration groove 221 in communication with the sealing groove 231, and when the to-be-welded flange 230 is placed, it is necessary to ensure that one end of the calibration groove 221 close to the center is located inside the sealing groove 231, so as to ensure that a plurality of calibration blocks 254 can be smoothly inserted into the sealing groove 231 in the subsequent process, and the position of the to-be-welded flange 230 is calibrated.

[0036] The calibration mechanism 200 further comprises an adjusting rod 240 rotatably arranged in the middle of the second machining platform 120, and a calibration piece 250 is slidably arranged on the outer wall of the adjusting rod 240 in the height direction.

[0037] Please refer to Figures 2 to 9 The calibration piece 250 comprises a moving disc 251 threadedly connected to the lower part of the outer wall of the adjusting rod 240, a plurality of second connecting columns 252 are equidistantly arranged on the top of the outer wall of the moving disc 251, a combination disc 253 is fixedly connected to the top of the outer wall of the second connecting columns 252, the second connecting columns 252 are fixed to the moving disc 251 through bolts, which facilitates production and adjustment of the distance between the combination disc 253 and the calibration disc 220, and the travel of the combination disc 253 can be flexibly adjusted according to the flanges 230 of different thicknesses to be welded, a calibration block 254 is equidistantly arranged on the top of the outer wall of the combination disc 253 and penetrates through the calibration groove 221 and extends into the sealing groove 231, a driving motor 255 is fixedly connected to the bottom of the second machining platform 120, and the driving end of the driving motor 255 is fixedly connected to the bottom of the adjusting rod 240; the calibration block 254 is shaped as a right trapezoid, and the side away from the center point of the combination disc 253 is an inclined side, so that the inclined side of the calibration block 254 can smoothly contact the bottom of the inner wall of the sealing groove 231, thereby achieving adjustment of the position of the flanges 230 to be welded.

[0038] Please refer to Figures 3 to 11 A communication groove 111 is formed in the middle of the outer wall of the first machining platform 110 and penetrates through the adjusting rod 240 and the second connecting columns 252, and a first moving groove 112 is formed around the communication groove 111 on the top of the first machining platform 110, the calibration mechanism 200 further comprises a moving shell 260 fixedly connected to the upper surface of the first machining platform 110 and located on both sides of the first moving groove 112, a moving block 261 is slidably connected to the inner side of the first moving groove 112, the moving block 261 has a first docking portion 262, a plurality of second docking portions 256 are equidistantly arranged on the outer wall of the moving disc 251, and a connecting plate 263 rotatably connected to the second docking portions 256 is rotatably arranged at the first docking portion 262; a clamping mechanism 300 is arranged at the moving block 261, and the clamping mechanism 300 comprises an installation plate 310 fixedly connected to the top of the moving block 261, a square column 320 extending in the height direction is fixedly arranged on the top of the installation plate 310, a second moving groove 321 in communication with the outside in the width direction is formed in the upper part of the outer wall of the square column 320, a transverse limiting plate 330 is boltedly connected to the inner wall of the second moving groove 321, and a transverse limiting portion 331 in contact with the side wall of the flanges 230 to be welded is formed at the end of the transverse limiting plate 330 away from the second moving groove 321.

[0039] Please refer to Figures 3 to 11, the inner wall of the second moving groove 321 is provided with an adjusting groove 322 at the top, the adjusting groove 322 is slidably connected with a guide column 340, the inner wall of the second moving groove 321 is slidably connected with a vertical limiting plate 350 at the top of the horizontal limiting plate 330, the vertical limiting plate 350 has a vertical limiting part 351 in contact with the top of the outer wall of the flange to be welded 230, the outer wall of the guide column 340 is fixedly connected with a connecting disc 341 at the bottom, and the connecting disc 341 is rotatably connected with the top of the vertical limiting plate 350, and the outer wall of the guide column 340 is sleeved with a spring 352; the square column 320 is rotatably connected with a rotating cover 360 at the top near the adjusting groove 322, the rotating cover 360 has a communication hole 361 for the sliding of the guide column 340, the outer wall of the guide column 340 is slidably provided with a guide groove 342 along the height direction, the guide groove 342 is provided with an annular groove 343 on both sides, and the inner side of the communication hole 361 is provided with an extension block 362, and the extension block 362 is slidably connected with the guide groove 342 and the annular groove 343.

[0040] Please refer to Figures 4 to 11 , the two sides of the end of the vertical limiting plate 350 away from the vertical limiting part 351 are connected with bent plates 354, the bent plates 354 have extension parts 353, and the extension parts 353 between adjacent bent plates 354 are rotatably provided with telescopic assemblies 370; the telescopic assembly 370 comprises two rotating bars 371 rotatably connected with adjacent extension parts 353, the outer wall of the two rotating bars 371 is provided with a telescopic groove 372, and the telescopic groove 372 between the two rotating bars 371 is slidably provided with a connecting strip 373, and the end of the connecting strip 373 is fixedly connected with a mounting bolt 374; the first processing platform 110 and the second processing platform 120 are jointly provided with a recessed part 130, and the telescopic assembly 370 is not arranged between the two adjacent vertical limiting plates 350 near the recessed part 130, so as to avoid affecting the taking of the flange to be welded 230.

[0041] Working principle and use steps: when the laser welding of the to-be-welded flange 230 is needed, the worker stands at the recessed part 130 position and places the to-be-welded flange 230 in the middle position of the calibration disc 220 on the first connecting column 210, starts the driving motor 255, and drives the adjusting rod 240 to rotate forward, so as to drive the moving disc 251 in the calibration piece 250 to move upward along the adjusting rod 240. The moving disc 251 moves upward, drives the second connecting column 252 to move upward, and the calibration block 254 on the combined disc 253 will enter the inside of the calibration groove 221, and since the calibration block 254 is a right trapezoid, the calibration block 254 will enter the sealing groove 231 of the to-be-welded flange 230. The calibration block 254 slides upward, so that the inclined edge of the calibration block 254 slides in contact with the inner wall of the sealing groove 231, thereby driving the to-be-welded flange 230 to slide on the surface of the calibration disc 220 and guiding the to-be-welded flange 230 to slide to the center of the calibration disc 220. Compared with the prior art, the calibration block 254 of the present application enters the sealing groove 231 of the to-be-welded flange 230, and the to-be-welded flange 230 is accurately positioned at the center of the calibration disc 220, thereby improving the uniformity of the force of the to-be-welded flange 230 during subsequent clamping and improving the stability of the to-be-welded flange 230 during subsequent clamping.

[0042] After the to-be-welded flange 230 is moved to the center position of the calibration disc 220, the driving motor 255 is started to drive the adjusting rod 240 to reverse, drive the moving disc 251 in the calibration piece 250 to move downward along the adjusting rod 240, so that the calibration block 254 is separated from the inner wall of the sealing groove 231, and the to-be-welded flange 230 is prevented from being blocked during subsequent welding. The moving disc 251 slides downward, the connecting plate 263 on the second connecting part 256 rotates, thereby driving the moving block 261 on the first connecting part 262 to slide on the moving shell 260, so that the moving block 261 slides in the direction of the communication groove 111. The square column 320 connected with the moving shell 260 through the mounting plate 310 approaches the to-be-welded flange 230, so that the transverse limiting part 331 on the transverse limiting plate 330 contacts the to-be-welded flange 230 and fixes the to-be-welded flange 230 in multiple directions in the width direction.

[0043] The rotating cover 360 on the square column 320 is rotated to make the extension protrusion 362 in the communication hole 361 slide on the surface of the guide groove 342, the spring 352 pushes the connecting disc 341 downward, thereby pushing the vertical limiting plate 350 downward, so that the vertical limiting part 351 is pressed and fixed with the edge part of the top of the outer wall of the to-be-welded flange 230, after the vertical limiting part 351 is in contact with the to-be-welded flange 230, the rotating cover 360 is rotated again to make the extension protrusion 362 in the communication hole 361 rotate from the guide groove 342 to the position of the annular groove 343, thereby limiting the vertical limiting plate 350, when it is needed to cancel the limiting of the vertical limiting plate 350, the extension protrusion 362 is rotated from the annular groove 343 to the guide groove 342 again, the guide column 340 is lifted upward, thereby canceling the limiting of the vertical limiting plate 350 on the to-be-welded flange 230, and the extension protrusion 362 and the annular groove 343 are matched to position the vertical limiting plate 350 after the limiting is canceled, the horizontal limiting plate 330 and the vertical limiting plate 350 are matched to realize the multidirectional limiting and fixing of the to-be-welded flange 230, and the limiting effect of the to-be-welded flange 230 is improved.

[0044] Considering that in actual use, when multiple vertical limiting plates 350 are limited, manual operation is very cumbersome, the staff lifts the vertical limiting plate 350 to adjust the position, the telescopic assembly 370 drives the adjacent two vertical limiting plates 350 to move synchronously, thereby driving multiple vertical limiting plates 350 to move synchronously, the rotating cover 360 corresponding to the current is rotated to position a single vertical limiting plate 350, and the position of other vertical limiting plates 350 can be adjusted synchronously, only the rotating cover 360 corresponding to other vertical limiting plates 350 is rotated, without lifting the vertical limiting plate 350 again, the operation of fixing multiple vertical limiting plates 350 is simplified, and when the square column 320 moves, the rotating strip 371 on the extension part 353 rotates, and the mounting bolt 374 on the connecting strip 373 slides in the telescopic groove 372, while ensuring that the square column 320 can move normally, the multiple vertical limiting plates 350 are connected with each other.

[0045] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A laser welding device for hydraulic cylinder accessory machining, comprising a main frame, the main frame having a top first machining platform, a second machining platform fixedly connected at the bottom of the first machining platform, and a calibration mechanism arranged at the second machining platform; the calibration mechanism comprising a plurality of first connecting columns fixedly connected to the top of the first machining platform, a calibration disc fixedly connected to the top of the plurality of first connecting columns, and a to-be-welded flange placed on the top of the calibration disc, the to-be-welded flange having a sealing groove, and the calibration disc further having a calibration groove in communication with the sealing groove; the calibration mechanism further comprising an adjusting rod rotatably arranged in the middle of the second machining platform, and a calibration piece sliding along the height direction on the outer wall of the adjusting rod; the calibration piece comprising a moving disc threadedly connected to the middle and lower part of the outer wall of the adjusting rod, a plurality of second connecting columns equidistantly arranged on the top of the outer wall of the moving disc, a combination disc fixedly connected to the top of the outer wall of the plurality of second connecting columns, a calibration block equidistantly arranged on the top of the outer wall of the combination disc and penetrating through the calibration groove and into the sealing groove, a driving motor fixedly connected to the bottom of the second machining platform, and the driving motor driving end fixedly connected to the bottom of the adjusting rod; the calibration block being in the shape of a right trapezoid, and the side of the calibration block away from the center point of the combination disc being an inclined side; a communication groove is formed in the middle of the outer wall of the first machining platform for the adjusting rod and the second connecting columns to penetrate through, a first moving groove is formed around the top of the first machining platform, the calibration mechanism further comprising a moving shell fixedly connected to the upper surface of the first machining platform and located on both sides of the first moving groove, a moving block slidingly connected in the first moving groove, the moving block having a first docking portion, a plurality of second docking portions equidistantly arranged on the outer wall of the moving disc, and a connecting plate rotatably connected to the second docking portions and rotatably arranged at the first docking portion; a clamping mechanism is arranged at the moving block, the clamping mechanism comprising an installation plate fixedly connected to the top of the moving block, a square column extending along the height direction fixedly arranged on the top of the installation plate, a second moving groove in communication with the outside in the width direction formed in the upper part of the outer wall of the square column, a transverse limiting plate boltedly connected to the inner wall of the second moving groove, and a transverse limiting portion formed at the end of the transverse limiting plate away from the second moving groove and in contact with the side wall of the to-be-welded flange.

2. The laser welding device for hydraulic cylinder fitting machining according to claim 1, characterized in that: an adjusting groove is formed in the top of the inner wall of the second moving groove, a guide column slidingly connected in the adjusting groove, a vertical limiting plate slidingly connected to the top of the inner wall of the second moving groove and located at the top of the transverse limiting plate, the vertical limiting plate having a vertical limiting portion in contact with the top of the outer wall of the to-be-welded flange, a connecting disc fixedly connected to the bottom of the outer wall of the guide column and rotatably connected to the top of the vertical limiting plate, and a spring sleeved on the outer wall of the guide column.

3. The laser welding device for hydraulic cylinder fitting machining according to claim 2, characterized in that: a rotary cover rotatably connected to the top of the square column near the adjusting groove, the rotary cover having a communication hole for the guide column to slide through, a guide groove sliding along the height direction on the outer wall of the guide column, annular grooves formed on both sides of the guide groove, an extension protrusion arranged on the inner side of the communication hole, and the extension protrusion slidingly connected to the guide groove and the annular grooves.

4. The laser welding device for hydraulic cylinder fitting machining according to claim 2, characterized in that: bent plates connected on both sides of the end of the vertical limiting plate away from the vertical limiting portion, the bent plates having extension portions, and a telescopic assembly rotatably arranged between the extension portions of adjacent bent plates.

5. The laser welding device for hydraulic cylinder fitting machining according to claim 4, characterized in that: The telescopic assembly comprises two rotating bars rotatably connected to adjacent extension parts, and a connecting bar sliding between the telescopic grooves of the two rotating bars.

6. The laser welding device for hydraulic cylinder fitting machining according to claim 1, characterized in that: The first machining platform and the second machining platform jointly form a recess.

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