Irregular workpiece edge electric arc material increasing device

Abstract

The invention discloses an irregular workpiece edge electric arc material adding device, and belongs to the field of electric arc material adding, the irregular workpiece edge electric arc material adding device comprises a support and two groups of universal clamps arranged on the support, and a plurality of piston rods arranged in a linear array are slidably connected to the edges of two vertically symmetrical mounting seats close to a welding part; passive air cylinders corresponding to the multiple sets of piston rods are arranged between the two horizontally-arranged universal clamps, a conveying belt is arranged on the lower portions of the passive air cylinders, when the distance between the two vertically-symmetrical piston rods is reduced, the extending length of the corresponding passive air cylinders is increased, and therefore the multiple passive air cylinders push the conveying belt to be in a broken line shape. A sliding block is linearly arranged on the lower portion of the conveying belt in a sliding mode, an air nozzle is connected to the sliding block, the welding gun moves along with the sliding block, and when the sliding block moves to the protruding position of the conveying belt, wind power of the air nozzle is reduced. The device can automatically adjust the welding power, speed and heat dissipation intensity according to the thickness of the welding position of an irregular workpiece.

Description

Technical Field

[0001] The present invention relates to the technical field of arc additive manufacturing, and particularly to an arc additive device for the edge of an irregular workpiece. Background Art

[0002] In modern manufacturing, with the increasing complexity and diversification of product structures, irregular-shaped workpieces are increasingly widely used, such as complex components in the aerospace field and personalized structural parts in the automotive industry. Additive welding of the edges of irregular workpieces to achieve workpiece repair, strengthening, or dimensional restoration has become an important processing method in the manufacturing industry.

[0003] Traditional welding technologies, such as Gas Metal Arc Welding (GMAW), Gas Tungsten Arc Welding (GTAW), etc., can better meet production requirements when dealing with regular-shaped workpieces. However, when facing the edge additive welding of irregular-shaped workpieces, traditional methods have many problems. For example, when welding thin plate parts, it is difficult for traditional methods to precisely control the welding heat input, which easily leads to burn-through; while when welding thick plates or corner parts, there may be lack of penetration and thus false welding.

[0004] Existing additive manufacturing technologies can, to a certain extent, achieve the processing of irregular shapes, but there are still deficiencies in welding efficiency, cost control, and adaptability to complex shapes. Especially in the additive welding scenario with special requirements for the edges of irregular workpieces, existing equipment and processes cannot adjust welding parameters and cooling effects in real time and precisely according to the thickness changes of different parts of the workpiece, and it is difficult to meet the production requirements of high quality and high efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide an arc additive device for the edge of an irregular workpiece, which solves the problem that it is not easy to control the power, speed, and heat dissipation intensity during the welding of irregular workpieces.

[0006] To achieve the above purpose, the present invention provides the following technical solution: An arc additive device for the edge of an irregular workpiece, comprising a bracket and two sets of universal clamps arranged on the bracket. The universal clamp includes a rectangular box, and a mounting seat is fixedly connected inside the rectangular box. A plurality of piston rods arranged in a linear array are slidably connected to the edges of two vertically symmetric mounting seats near the welding part. A passive cylinder corresponding to multiple groups of the piston rods is arranged between the two horizontally arranged universal clamps. A conveyor belt is arranged below the passive cylinder. When two vertically corresponding piston rods approach each other, they can clamp the workpiece, and when the distance between two vertically symmetric piston rods decreases, the extension length of a corresponding passive cylinder increases, so that multiple passive cylinders push the conveyor belt into a zigzag shape;

[0007] A slider is linearly and slidably arranged at the lower part of the conveyor belt. A nozzle is connected to the slider, and the welding torch follows the slider. When the slider moves to the protruding position of the conveyor belt, the wind force of the nozzle decreases.

[0008] Preferably, a transfer seat is fixedly connected between two universal jigs symmetrically arranged horizontally at the upper part. One end of the transfer seat is rotatably connected with a roller, one end of the conveyor belt is wound around the roller, and the other end of the conveyor belt is fixedly connected to the end of the transfer seat far from the roller.

[0009] A plurality of cross bars in a linear array are fixedly connected to the conveyor belt, and the plurality of cross bars are magnetically attracted to the upper part of the transfer seat.

[0010] Preferably, an air duct is opened in the nozzle. A conical inner wall is arranged at the top of the air duct. A conical plug is vertically slidably connected to the upper part of the conical inner wall in the nozzle. A cylindrical hole which is in clearance fit with the conical plug is opened in the nozzle. An air pipe communicated with the cylindrical hole is connected to the nozzle. The conical plug vertically slides in the nozzle along with the zigzag undulation of the conveyor belt, so as to change the air flow rate of the air duct.

[0011] Preferably, a connecting rod is fixedly connected to the top of the conical plug. A rectangular block is fixedly connected to the top of the connecting rod. The rectangular block is attached to the lower surface of the conveyor belt. A tension spring is connected between the conical plug and the nozzle.

[0012] Preferably, piston chambers which are matched with a plurality of the piston rods are opened at the edges of two vertically symmetric mounting seats close to the welding part. A piston plate is fixedly connected to the top of the piston rod. The piston plate slides in the piston chamber. An air pipe is connected between two vertically symmetric piston chambers and a corresponding passive air cylinder. When two vertically symmetric piston rods approach each other, air is injected into the corresponding passive air cylinder from the two piston chambers. When the distance between two vertically symmetric piston rods decreases, the elongation length of the passive air cylinder increases.

[0013] Preferably, a first locking plate is slidably connected in the transfer seat. Through holes which are in clearance fit with the cylinder rods of a plurality of the passive air cylinders are opened on the first locking plate. When the workpiece is locked by the universal jig, the first locking plate slides, so that the inner wall of the through hole on the first locking plate abuts against the cylinder rod of the passive air cylinder to lock the passive air cylinder.

[0014] Preferably, a gear is fixedly connected to the end of the roller shaft of the roller. A rack is fixedly connected to the first locking plate. When the first locking plate slides, the rack meshes with the gear to drive the roller to rotate, so as to tighten the conveyor belt.

[0015] Preferably, a torsion spring is connected between the gear and the conveying seat.

[0016] Preferably, there is a sealed space between the mounting seat and the rectangular box, and a pressure pipe communicating with the sealed space is connected to the rectangular box;

[0017] A plurality of locking rods arranged in a rectangular array are slidably connected to the mounting seat. Convex rings are provided on both the locking rods and the piston rod, and the convex rings abut against the mounting seat. When the pressure pipe injects gas into the sealed space, the plurality of locking rods can slide and abut against the workpiece;

[0018] Hydraulic rods are connected between the two universal clamps located in the upper part and the bracket.

[0019] Preferably, a locking cylinder is fixedly connected to the bracket. A locking pipe is communicated with the locking cylinder. A pressure valve is arranged on the locking pipe. The locking pipe is communicated with the pressure pipe, and a pressurizing pipe is communicated with the pressure pipe;

[0020] The universal clamp includes a locking surface. The output end of the locking cylinder is fixedly connected with a vertical plate. A second locking plate is slidably connected to the vertical plate. A hole for clearance fit with the plurality of piston rods and the plurality of locking rods is formed on the second locking plate. The second locking plate slides between the mounting seat and the locking surface. After the locking rods lock the workpiece, the locking cylinder extends to push the inner wall of the through hole of the second locking plate to abut against the plurality of piston rods and the plurality of locking rods.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] In the present invention, the extending length of the passive cylinder increases as the distance between the piston rods decreases, thereby pushing the conveyor belt into a zigzag shape. When the slider passes through the relatively high protruding part at the lower part of the conveyor belt, it indicates that the thickness of the workpiece here is low, and the air volume of the air nozzle decreases. When the control system detects that the air volume of the air nozzle decreases, it controls the sliding speed of the slider to increase, and at the same time reduces the voltage of the welding head, thereby preventing the workpiece from being welded through. When the slider moves to the relatively low protruding part at the lower part of the conveyor belt, it indicates that the thickness of the workpiece here is high, and the air volume of the air nozzle increases. When the control system detects that the air volume of the air nozzle increases, it controls the sliding speed of the slider to decrease, and at the same time increases the voltage of the welding head, thereby preventing the workpiece from having a false weld and increasing the cooling effect on the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the overall structure of the present invention Figure 1 ;

[0024] Figure 2 Schematic diagram of the overall structure of the present invention Figure 2 ;

[0025] Figure 3 Cross-sectional view of the universal fixture of the present invention;

[0026] Figure 4 Schematic structural view of the piston rod of the present invention;

[0027] Figure 5 Schematic structural view of the conveyor belt of the present invention;

[0028] Figure 6 Cross-sectional view of the air nozzle of the present invention.

[0029] In the figure: 100, support; 110, hydraulic rod; 120, locking cylinder; 200, universal fixture; 210, mounting seat; 220, locking rod; 221, second locking plate; 230, convex ring; 240, locking surface; 250, vertical plate; 260, pressure pipe; 270, pressurizing pipe; 280, locking pipe; 290, pressure valve; 300, passive cylinder; 310, air pipe; 320, piston rod; 321, piston plate; 330, conveying seat; 340, roller; 341, conveyor belt; 342, cross bar; 350, first locking plate; 351, rack; 360, gear; 361, torsion spring; 400, slider; 410, air nozzle; 420, air duct; 421, conical inner wall; 430, conical plug; 440, connecting rod; 441, tension spring; 450, rectangular block; 460, air pipe. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the 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 those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] Refer to Figures 1-6, this embodiment provides a technical solution: an irregular workpiece edge arc additive manufacturing device, including a bracket 100 and two groups of universal clamps 200 arranged on the bracket 100. The universal clamp 200 includes a rectangular box, and a mounting seat 210 is fixedly connected inside the rectangular box. A plurality of piston rods 320 arranged in a linear array are slidably connected to the edges of two vertically symmetric mounting seats 210 near the welding part. A passive cylinder 300 corresponding to the plurality of piston rods 320 is arranged between the two horizontally arranged universal clamps 200. A conveyor belt 341 is arranged below the passive cylinder 300. When two vertically corresponding piston rods 320 approach each other, they can clamp the workpiece. When the distance between two vertically symmetric piston rods 320 decreases, the extended length of the corresponding passive cylinder 300 increases, so that the plurality of passive cylinders 300 push the conveyor belt 341 into a zigzag shape; A slider 400 is linearly slidably arranged below the conveyor belt 341, and a nozzle 410 is connected to the slider 400. The welding torch follows the slider 400. When the slider 400 moves to the protruding position of the conveyor belt 341, the wind force of the nozzle 410 decreases.

[0032] During use, place the workpiece to be welded on the lower universal clamp 200 so that the welding part is between the two universal clamps 200. Start the universal clamp 200 to lock the workpiece. When the universal clamp 200 locks the workpiece, the upper and lower rows of piston rods 320 near the welding part approach each other, clamping the part of the workpiece near the welding part. If the gap between the two vertical piston rods 320 is small, it means that the clamped part of the workpiece is thinner; otherwise, it means that the clamped part is thicker.

[0033] The welding torch (not shown in the figure) is vertically slidably arranged on the slider 400, and the vertical movement of the welding torch is adjusted by relying on existing technologies such as laser or acoustic ranging, so as to adapt to the shape undulation of the irregular workpiece.

[0034] The passive cylinder 300 corresponds to two vertically symmetric piston rods 320. When the distance between the two piston rods 320 is small, the extended length of the corresponding passive cylinder 300 increases. When the distances between multiple vertically and symmetrically arranged piston rods 320 are different, the extended lengths of multiple passive cylinders 300 are also unequal. Thus, multiple passive cylinders 300 with different lengths can push the conveyor belt 341 to deform, making the side projection of the conveyor belt 341 present a fluctuating zigzag shape. The slider 400 moves under the conveyor belt 341, and the welding torch moves synchronously with the slider 400 to weld a straight and uneven weld. When the slider 400 passes through a relatively high protruding part under the conveyor belt 341, it indicates that the thickness of the workpiece here is low, and the air volume of the air nozzle 410 decreases. When the control system detects that the air volume of the air nozzle 410 decreases, it controls the sliding speed of the slider 400 to increase, and at the same time reduces the voltage of the welding head, thereby preventing the workpiece from being welded through. When the slider 400 moves to a relatively low protruding part under the conveyor belt 341, it indicates that the thickness of the workpiece here is high, and the air volume of the air nozzle 410 increases. When the control system detects that the air volume of the air nozzle 410 increases, it controls the sliding speed of the slider 400 to decrease, and at the same time increases the voltage of the welding head, thereby preventing the workpiece from having a false weld and increasing the cooling effect on the workpiece at the same time;

[0035] The slider 400 can be driven to slide by a lead screw, and the control system controls the sliding speed of the slider 400 by controlling the rotation speed of the lead screw.

[0036] There is a transfer seat 330 fixedly connected between two universal jigs 200 arranged horizontally and symmetrically at the upper part. One end of the transfer seat 330 is rotatably connected with a roller 340, one end of the conveyor belt 341 is wound around the roller 340, and the other end of the conveyor belt 341 is fixedly connected to the end of the transfer seat 330 far from the roller 340; A plurality of cross bars 342 in a linear array are fixedly connected to the conveyor belt 341, and the plurality of cross bars 342 are magnetically attracted to the upper part of the transfer seat 330.

[0037] The end of the cylinder rod of the passive cylinder 300 is provided with a fillet to prevent the end from getting stuck on the cross bar 342 when the passive cylinder 300 extends. The setting of the cross bar 342 can make the surface of the conveyor belt 341 continuous when it is pushed by the passive cylinder 300 without showing a shape similar to a bulge. And when the passive cylinder 300 extends, the conveyor belt 341 on the roller 340 is released, so that the extension of the passive cylinder 300 will not be interfered;

[0038] The cross bar 342 is magnetically attracted to the upper part of the transfer seat 330. Thus, if the passive cylinder 300 between two passive cylinders 300 with longer extended lengths has a shorter extended length, the cross bar 342 under the passive cylinder 300 with a shorter extension is magnetically adsorbed and moves upward, so that a concave part can appear on the conveyor belt 341, ensuring that the conveyor belt 341 can form a zigzag projection reflecting the wall thickness of the workpiece.

[0039] An air duct 420 is provided inside the air nozzle 410. A conical inner wall 421 is provided at the top of the air duct 420. A conical plug 430 is vertically slidably connected inside the air nozzle 410 above the conical inner wall 421. A cylindrical hole that is in clearance fit with the conical plug 430 is provided inside the air nozzle 410. An air duct 460 that communicates with the cylindrical hole is connected to the air nozzle 410. The conical plug 430 vertically slides inside the air nozzle 410 following the zigzag undulation of the conveyor belt 341, thereby changing the air flow rate of the air duct 420.

[0040] When the slider 400 moves to a relatively protruding position of the conveyor belt 341, the conical plug 430 can approach the conical inner wall 421. At this time, the gap between the conical plug 430 and the conical inner wall 421 decreases, thereby reducing the air flow rate. At this time, the wind force blown out by the air nozzle 410 through the air duct 420 decreases. When the slider 400 slides from the protruding part at the lower part of the conveyor belt 341 to the concave part, the conical plug 430 moves upward. At this time, the gap between the conical plug 430 and the conical inner wall 421 increases, thereby increasing the air flow rate. At this time, the wind force blown out by the air nozzle 410 through the air duct 420 increases.

[0041] A connecting rod 440 is fixedly connected to the top of the conical plug 430. A rectangular block 450 is fixedly connected to the top of the connecting rod 440. The rectangular block 450 is in contact with the lower surface of the conveyor belt 341. A tension spring 441 is connected between the conical plug 430 and the air nozzle 410.

[0042] The rectangular block 450 is in contact with the lower surface of the conveyor belt 341. The tension spring 441 applies a pulling force to the conical plug 430 to move the connecting rod 440 upward, ensuring the close contact between the rectangular block 450 and the conveyor belt 341. Thus, when the slider 400 moves, the rectangular block 450 is affected by the surface undulation of the conveyor belt 341 and drives the conical plug 430 to vertically slide inside the air nozzle 410, so that the air output of the air nozzle 410 can be changed in real time according to the welding thickness of the workpiece.

[0043] Piston chambers that cooperate with a plurality of piston rods 320 are provided at the edges of the two vertically symmetric mounting seats 210 near the welding part. A piston plate 321 is fixedly connected to the top of the piston rod 320. The piston plate 321 slides in the piston chamber. An air pipe 310 is connected between the two vertically symmetric piston chambers and a corresponding one of the passive cylinders 300. When the two vertically symmetric piston rods 320 approach each other, the two piston chambers inject air into the corresponding one of the passive cylinders 300, and when the distance between the two vertically symmetric piston rods 320 decreases, the elongation length of the passive cylinder 300 increases.

[0044] When the two vertically symmetric piston rods 320 approach each other, the two piston plates 321 connected thereto slide synchronously. At this time, the piston plates 321 push the air in the corresponding piston chambers and transmit it through the air pipes 310 into the corresponding passive cylinders 300, causing the corresponding passive cylinders 300 to extend. Moreover, by adjusting the distance between the two universal fixtures 200 that are vertically symmetric, the sliding distance of the upper piston rod 320 can be increased or decreased accordingly, so that the extension length of the corresponding passive cylinder 300 is increased to adapt to the workpiece thickness response with different undulation degrees. The length differences between the multiple passive cylinders 300 are determined by the different thicknesses of the workpieces.

[0045] A first locking plate 350 is slidably connected in the transfer seat 330. Through holes that are clearance - fitted with the cylinder rods of the multiple passive cylinders 300 are formed on the first locking plate 350. When the workpiece is locked by the universal fixture 200, the first locking plate 350 slides so that the inner walls of the through holes on the first locking plate 350 abut against the cylinder rods of the passive cylinders 300 to lock the passive cylinders 300.

[0046] The sliding of the first locking plate 350 is driven by an electric push rod (not shown in the figure). The electric push rod is fixedly connected to the transfer seat 330, and the output end is fixedly connected to the first locking plate 350. When the control system detects that the passive cylinder 300 no longer extends, it controls the first locking plate 350 to slide. At this time, the inner walls of the through holes on the first locking plate 350 abut against the cylinder rods of the passive cylinders 300 to lock the passive cylinders 300, ensuring the stability of the passive cylinders 300. Anti - slip lines are provided on both the inner walls of the through holes on the first locking plate 350 and the cylinder rods of the passive cylinders 300 to increase the friction force.

[0047] A gear 360 is fixedly connected to the end of the roller shaft of the roller 340. A rack 351 is fixedly connected to the first locking plate 350. When the first locking plate 350 slides, the rack 351 meshes with the gear 360 to drive the roller 340 to rotate, thereby tightening the conveyor belt 341.

[0048] When the first locking plate 350 slides, the rack 351 connected to the first locking plate 350 slides and meshes with the gear 360, thereby driving the gear 360 to rotate slightly. At this time, the roller 340 rotates slightly, thereby tightening the conveyor belt 341 and ensuring the stable shape of the conveyor belt 341.

[0049] A torsion spring 361 is connected between the gear 360 and the transfer seat 330.

[0050] The torsion spring 361 applies a rotational force to the roller 340, so that when the passive cylinder 300 shortens, the roller 340 can rotate back and retract the conveyor belt 341 to straighten the conveyor belt 341.

[0051] There is a sealed space between the mounting seat 210 and the rectangular box, and a pressure pipe 260 communicating with the sealed space is connected to the rectangular box; a plurality of locking rods 220 arranged in a rectangular array are slidably connected to the mounting seat 210, and convex rings 230 are provided on both the locking rods 220 and the piston rods 320. The convex rings 230 abut against the mounting seat 210. When the pressure pipe 260 injects gas into the sealed space, the plurality of locking rods 220 can slide and abut against the workpiece; Hydraulic rods 110 are connected between the two universal jigs 200 located in the upper part and the bracket 100.

[0052] By controlling the synchronous expansion and contraction of the two hydraulic rods 110, the two universal jigs 200 in the upper part can be made to approach or move away from the two universal jigs 200 in the lower part synchronously. When the pressure pipe 260 inflates the sealed space, the air pressure pushes the plurality of locking rods 220 and the plurality of piston rods 320 to slide closer to the workpiece. As the air pressure increases, the plurality of locking rods 220 and the plurality of piston rods 320 can abut against the workpiece. At this time, the clamping and locking of the workpiece are completed. By extracting the air in the sealed space through the pressure pipe 260, the plurality of locking rods 220 and the plurality of piston rods 320 can be made to move away from the workpiece, thereby releasing the locking of the workpiece. The setting of the convex ring 230 makes the locking rods 220 and the piston rods 320 stop sliding after sliding back to their original positions.

[0053] A locking cylinder 120 is fixedly connected to the bracket 100. A locking pipe 280 is communicated with the locking cylinder 120. A pressure valve 290 is provided on the locking pipe 280. The locking pipe 280 is communicated with the pressure pipe 260. A pressurizing pipe 270 is communicated with the pressure pipe 260; The universal jig 200 includes a locking surface 240. The output end of the locking cylinder 120 is fixedly connected with a vertical plate 250. A second locking plate 221 is slidably connected to the vertical plate 250. The second locking plate 221 is provided with holes that are in clearance fit with the plurality of piston rods 320 and the plurality of locking rods 220. The second locking plate 221 slides between the mounting seat 210 and the locking surface 240. After the locking rods 220 lock the workpiece, the locking cylinder 120 extends to push the inner wall of the through hole of the second locking plate 221 to abut against the plurality of piston rods 320 and the plurality of locking rods 220.

[0054] Air flows through the pressure pipe 270. When locking the workpiece, first place the workpiece on the locking surface 240 of the lower universal fixture 200, and then inject air through the pressure pipe 270. At this time, the air first enters the closed space through the pressure pipe 260. When the workpiece is locked and the air continues to be introduced, the air pressure will break through the limit of the pressure valve 290. At this time, the air enters the locking cylinder 120 through the locking pipe 280, so that the locking cylinder 120 extends, and pushes the second locking plate 221 to slide through the vertical plate 250. At this time, the inner wall of the through hole of the second locking plate 221 abuts against a plurality of piston rods 320 and a plurality of locking rods 220, and anti-slip threads are provided on the inner wall of the through hole of the second locking plate 221 and the outer walls of the plurality of piston rods 320 and the plurality of locking rods 220 to ensure the locking effect on the piston rods 320 and the locking rods 220;

[0055] The two upper universal fixtures 200 are slidably connected to the vertical plate 250 to ensure that the hydraulic rod 110 can drive the two upper universal fixtures 200 to move without interference.

[0056] After welding is completed, air is extracted through the pressure pipe 270. At this time, a negative pressure is generated in the closed space. At the same time, after the negative pressure breaks through the limit of the pressure valve 290, the air in the locking cylinder 120 is extracted. At this time, the workpiece is unlocked and can be taken out from the universal fixture 200.

[0057] Working principle: Place the workpiece to be welded on the lower universal fixture 200 so that the welding part is between the two universal fixtures 200. Start the universal fixture 200 and inject gas into the sealed space between the mounting seat 210 and the rectangular box through the pressure pipe 260. The air pressure pushes multiple locking rods 220 and piston rods 320 to slide close to the workpiece. As the air pressure increases, they abut against the workpiece to complete clamping and locking. The upper and lower rows of piston rods 320 near the welding part move closer to clamp the workpiece. The distance between the two vertically symmetric piston rods 320 reflects the thickness of the clamped part of the workpiece. When the two vertically symmetric piston rods 320 move closer to each other, the two piston plates 321 connected to them slide synchronously, and the air in the corresponding piston chambers is transmitted to the corresponding passive cylinders 300 through the air pipes 310, causing them to extend. The distances between multiple piston rods 320 arranged symmetrically up and down are different, and the extension lengths of multiple passive cylinders 300 are also different, thus deforming the conveyor belt 341 so that its side projection presents a fluctuating zigzag shape. The welding torch is vertically slidably arranged on the slider 400, and its vertical movement is adjusted by technologies such as laser or acoustic ranging to adapt to the shape undulation of the irregular workpiece. The slider 400 is driven by a lead screw to move under the conveyor belt 341, and the welding torch moves synchronously with the slider 400 to weld the straight and uneven weld seams. The tapered plug 430 in the air nozzle 410 slides vertically with the zigzag undulation of the conveyor belt 341, changing the air flow rate of the air duct 420. When the slider 400 moves to a relatively protruding position (low workpiece thickness) of the conveyor belt 341, the tapered plug 430 approaches the tapered inner wall 421, the air flow rate decreases, and the wind force of the air nozzle 410 decreases. After the control system detects this, it controls the sliding speed of the slider 400 to increase, and at the same time reduces the voltage of the welding head to prevent the workpiece from being welded through. When the slider 400 moves to a lower protruding position (high workpiece thickness) at the lower part of the conveyor belt 341, the tapered plug 430 moves upward, the air flow rate increases, and the wind force of the air nozzle 410 increases. After the control system detects this, it controls the sliding speed of the slider 400 to decrease, and at the same time increases the voltage of the welding head to prevent the workpiece from being poorly welded and enhance the cooling effect. When the control system detects that the passive cylinder 300 no longer extends, the electric push rod drives the first locking plate 350 to slide so that the inner wall of the through hole on it abuts against the cylinder rod of the passive cylinder 300 to lock the passive cylinder 300 and ensure its stability.When the first locking plate 350 slides, the rack 351 engages with the gear 360 to drive the roller 340 to rotate slightly to tighten the conveyor belt 341. The torsion spring 361 applies a turning force to the roller 340, so that when the passive cylinder 300 shortens, the roller 340 rotates to store the conveyor belt 341 and straighten it; when locking the workpiece, air is injected through the pressure pipe 270, first enters the closed space through the pressure pipe 260 to lock the workpiece, and the air continues to flow in to make the air pressure break through the limit of the pressure valve 290 and enter the locking cylinder 120 to make it extend, pushing the second locking plate 221 to slide, and the inner wall of its through hole abuts against a plurality of piston rods 320 and a plurality of locking rods 220 to further lock the workpiece; after welding is completed, air is extracted through the pressure pipe 270, a negative pressure is generated in the closed space, and after the negative pressure breaks through the limit of the pressure valve 290, the air in the locking cylinder 120 is extracted to release the locking of the workpiece, and the workpiece can be taken out from the universal fixture 200.

[0058] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An arc material addition device for irregular workpiece edges, comprising a support (100) and two sets of universal clamps (200) arranged on the support (100), characterized in that: The universal clamp (200) comprises a rectangular box, a mounting seat (210) is fixedly connected inside the rectangular box, and a plurality of piston rods (320) arranged in a linear array are slidably connected at the edges of two vertically symmetrical mounting seats (210) near the welding position. A passive cylinder (300) corresponding to the plurality of groups of piston rods (320) is arranged between the two horizontally arranged universal clamps (200), and a conveyor belt (341) is arranged at the lower part of the passive cylinder (300). When the two vertically corresponding piston rods (320) are close to each other, the workpiece can be clamped, and when the distance between the two vertically symmetrical piston rods (320) is reduced, the extension length of the corresponding passive cylinder (300) increases, so that the plurality of passive cylinders (300) push the conveyor belt (341) to form a broken line shape; A slider (400) is linearly slidably arranged at the lower part of the conveyor belt (341), and a wind nozzle (410) is connected to the slider (400). The welding gun moves with the slider (400), and when the slider (400) moves to a protruding position of the conveyor belt (341), the wind force of the wind nozzle (410) is reduced.

2. The arc material adding device for irregular workpiece edge according to claim 1, characterized in that: A conveying seat (330) is fixedly connected between two universal clamps (200) arranged horizontally and symmetrically at the upper part, one end of the conveying seat (330) is rotatably connected to a roller (340), one end of the conveying belt (341) is wound around the roller (340), and the other end of the conveying belt (341) is fixedly connected to an end of the conveying seat (330) away from the roller (340); A plurality of cross bars (342) in a linear array are fixedly connected to the conveyor belt (341), and the plurality of cross bars (342) are magnetically attracted to the upper portion of the conveyor seat (330).

3. The arc material adding device for irregular workpiece edge according to claim 2, characterized in that: The air nozzle (410) is provided with an air duct (420), the top of the air duct (420) is provided with a conical inner wall (421), a conical plug (430) is vertically slidably connected to the upper part of the conical inner wall (421) in the air nozzle (410), a cylindrical hole which is gap-matched with the conical plug (430) is provided in the air nozzle (410), the air duct (460) which is connected with the cylindrical hole is connected to the air nozzle (410), and the conical plug (430) vertically slides in the air nozzle (410) along with the zigzag fluctuations of the conveyor belt (341), thereby changing the air flow rate of the air duct (420).

4. The arc material adding device for irregular workpiece edge according to claim 3, characterized in that: The top of the conical plug (430) is fixedly connected to a connecting rod (440), the top of the connecting rod (440) is fixedly connected to a rectangular block (450), the rectangular block (450) is in contact with the lower surface of the conveyor belt (341), and a tension spring (441) is connected between the conical plug (430) and the air nozzle (410).

5. The arc material adding device for irregular workpiece edge according to claim 4, characterized in that: Piston cavities cooperating with the plurality of piston rods (320) are provided at the edges of two vertically symmetrical mounting seats (210) near the welding position, and a piston plate (321) is fixedly connected to the top of the piston rod (320), and the piston plate (321) slides in the piston cavity. An air pipe (310) is connected between the two vertically symmetrical piston cavities and a corresponding passive cylinder (300). When the two vertically symmetrical piston rods (320) approach each other, the two piston cavities inject air into the corresponding passive cylinder (300), and when the distance between the two vertically symmetrical piston rods (320) decreases, the elongation length of the passive cylinder (300) increases.

6. The arc material adding device for irregular workpiece edge according to claim 5, characterized in that: A first locking plate (350) is slidably connected inside the conveying seat (330), and a through hole is opened on the first locking plate (350) to match the clearance of the cylinder rods of the multiple passive cylinders (300). When the workpiece is locked on the universal clamp (200), the first locking plate (350) slides so that the inner wall of the through hole on the first locking plate (350) abuts against the cylinder rod of the passive cylinder (300), thereby locking the passive cylinder (300).

7. The arc material adding device for irregular workpiece edge according to claim 6, characterized in that: A gear (360) is fixedly connected to the roller shaft end of the rotating roller (340), and a rack (351) is fixedly connected to the first locking plate (350); when the first locking plate (350) slides, the rack (351) engages with the gear (360) to drive the rotating roller (340) to rotate, thereby tightening the conveyor belt (341).

8. The arc material adding device for irregular workpiece edge according to claim 7, characterized in that: A torsion spring (361) is connected between the gear (360) and the transmission seat (330).

9. The arc material adding device for irregular workpiece edge according to claim 8, characterized in that: A closed space is defined between the mounting seat (210) and the rectangular box, and a pressure pipe (260) communicating with the closed space is connected to the rectangular box; A plurality of locking rods (220) in a rectangular array are slidably connected to the mounting seat (210), and a convex ring (230) is provided on the locking rod (220) and the piston rod (320). The convex ring (230) abuts against the mounting seat (210), and when the pressure pipe (260) injects gas into the closed space, the plurality of locking rods (220) can slide and abut against the workpiece; A hydraulic rod (110) is connected between the two universal clamps (200) located at the upper part and the bracket (100).

10. The arc material adding device for irregular workpiece edge according to claim 9, characterized in that: The bracket (100) is fixedly connected with a locking cylinder (120), the locking cylinder (120) is connected with a locking tube (280), the locking tube (280) is provided with a pressure valve (290), the locking tube (280) is connected with the pressure tube (260), and the pressure tube (260) is connected with a pressurizing tube (270); The universal clamp (200) includes a locking surface (240), the output end of the locking cylinder (120) is fixedly connected to a vertical plate (250), and a second locking plate (221) is slidably connected to the vertical plate (250), and the second locking plate (221) is provided with a hole that is clearance-matched with a plurality of the piston rods (320) and a plurality of the locking rods (220), and the second locking plate (221) slides between the mounting seat (210) and the locking surface (240), and after the locking rod (220) locks the workpiece, the locking cylinder (120) extends to push the inner wall of the through hole of the second locking plate (221) to abut against the plurality of the piston rods (320) and the plurality of the locking rods (220).

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