CN111906409B - Arc striking device and method for electric welding machine - Google Patents
Arc striking device and method for electric welding machine Download PDFInfo
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- CN111906409B CN111906409B CN202010821895.0A CN202010821895A CN111906409B CN 111906409 B CN111906409 B CN 111906409B CN 202010821895 A CN202010821895 A CN 202010821895A CN 111906409 B CN111906409 B CN 111906409B
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- 238000003466 welding Methods 0.000 title claims abstract description 185
- 238000000034 method Methods 0.000 title claims abstract description 54
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 158
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 158
- 239000010937 tungsten Substances 0.000 claims abstract description 158
- 238000012360 testing method Methods 0.000 claims abstract description 51
- 230000000694 effects Effects 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 20
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 230000010355 oscillation Effects 0.000 claims description 31
- 239000007789 gas Substances 0.000 claims description 15
- 238000007790 scraping Methods 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 6
- 239000011261 inert gas Substances 0.000 claims description 6
- 239000000615 nonconductor Substances 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000010891 electric arc Methods 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 239000011796 hollow space material Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 description 36
- 230000002829 reductive effect Effects 0.000 description 10
- 230000002441 reversible effect Effects 0.000 description 9
- 239000010410 layer Substances 0.000 description 7
- 239000002893 slag Substances 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 238000013459 approach Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
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- 238000004146 energy storage Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
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- 230000000903 blocking effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
- B23K9/067—Starting the arc
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
- B23K9/067—Starting the arc
- B23K9/0671—Starting the arc by means of brief contacts between the electrodes
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- Arc Welding In General (AREA)
Abstract
The invention belongs to the technical field of electric welding machines, and particularly relates to an arc striking device and an arc striking method of an electric welding machine, which comprise the following steps: s1: placing a workpiece to be welded on the first base, and pressing the workpiece tightly through a fixing plate; adjusting the distance between the two workpieces through a third air cylinder; placing test blocks with the same material in the test clamp groove; s2: on the basis of the step S1, switching on a power supply, starting an arc striking box, controlling a tungsten electrode to be close to a test block, and testing the arc striking effect; s3: after the step S2 is completed, the test block is taken down, and the distance between the tungsten electrode and the workpiece is adjusted; s4: on the basis of the step of S3, adjusting the angle of the welding part of the tungsten electrode and the workpiece; s5: selecting whether to use a welding wire according to the material of a welding workpiece; when the welding wire is used, the welding wire is sent to a welding position, the motor is controlled to operate, the protection plate is close to the tungsten electrode, and the protection gas is released; the arc striking device has the advantages of good arc striking effect, stable work, reliable performance and safe use.
Description
Technical Field
The invention belongs to the technical field of electric welding machines, and particularly relates to an arc striking device and an arc striking method of an electric welding machine.
Background
In the welding process of the electric welding machine, due to the existence of an oxidation layer with poor conductivity or other impurities on the surface layer of the metal to be welded, the arc striking welding cannot be smoothly carried out in the welding process. The current common method for solving the problems is to break down an oxide layer by means of a high-voltage arc striking device so as to achieve the purpose of striking an arc. The existing arc striking device can not strike arc smoothly when the distance between the electric welding machine and a welding construction site is relatively long, namely when an electrode wire of a welding gun is relatively long. Because the distant wire has the resistance and equivalent inductance resistance effect for high frequency current, the high frequency arc striking energy is attenuated sharply, the success rate of arc striking is reduced directly, even the arc striking can not be performed. The blocking effect of the equivalent inductance is usually solved by reducing the frequency of the ignition pulse power supply or increasing the supply margin of the ignition device to the ignition energy.
In the prior art, some technical solutions also exist, for example, chinese patent with application number CN201220135845.8, including a control switch circuit module, a high-frequency filter circuit module, an energy storage circuit module, a high-frequency step-up transformer T1, a rectifier filter circuit module, and an energy conversion voltage limiting circuit module, where the energy storage circuit module is connected to an output end of the high-frequency filter circuit module after being connected in series with a primary coil of the high-frequency step-up transformer T1, and an input end of the high-frequency filter circuit module is electrically connected to a high-frequency ac power supply.
Disclosure of Invention
The invention provides an arc striking device and an arc striking method of an electric welding machine, aiming at overcoming the defects of the prior art and solving the problem that arc striking cannot be smoothly performed under the condition that an electrode wire of a welding gun is long.
The technical scheme adopted by the invention for solving the technical problems is as follows: the arc striking device of the electric welding machine comprises a first base, wherein a plurality of uniformly distributed conveying rollers are arranged on the first base; a plurality of balls which are uniformly distributed are arranged on the first base; the conveying roller is positioned on the left side of the ball, and the conveying roller and the ball are not in contact; the highest point of the conveying roller and the highest point of the ball are at the same height; a clamping plate is arranged on the first base; the two clamping plates are symmetrically distributed on two sides of the base, and are mirror images of each other; the ball is positioned on the first base between the clamping plates; a groove is formed in the side surface of the clamping plate facing to the base in one direction; a vertical sliding groove is formed in the vertical side wall of the groove; a horizontal sliding groove is formed in the horizontal side wall of the groove above the groove; a vertical sliding block is arranged in the vertical sliding groove in a sliding manner; a horizontal sliding block is arranged in the horizontal sliding groove in a sliding manner; a first cylinder is mounted on the vertical sliding block; a second air cylinder is installed on the horizontal sliding block; a mounting seat is fixedly mounted on a first extension rod of the first air cylinder; an extension rod II of the cylinder II is fixedly connected to the mounting seat; a third air cylinder is fixedly arranged on the mounting seat; a third extension rod of the third cylinder is provided with a fixed plate; the fixing plate is positioned above the first base; the lower surface of the fixed plate is provided with a rubber layer; a common metal electrode is arranged in the rubber layer; the metal electrode is connected to the positive electrode of a power supply; a second base is arranged on the right side of the first base; the lower surface of the second base is provided with universal wheels; the upper surface of the base II is provided with a first electric cylinder; a first moving plate is hinged above the fourth extension rod of the first electric cylinder; a second electric cylinder is arranged between the fourth extension rod and the first moving plate; two ends of the second electric cylinder are respectively hinged to the left side surface of the extension rod IV and the lower surface of the first moving plate; one end of the first moving plate, far away from the fourth extension rod, is hinged with a second moving plate; a third electric cylinder is arranged between the first moving plate and the second moving plate; two ends of the third electric cylinder are respectively hinged to the lower surface of the first moving plate and the lower surface of the second moving plate; the hinge points of the second electric cylinder and the third electric cylinder on the first moving plate are respectively positioned at two ends of the first moving plate; an arc striking box is arranged on the upper surface of the second moving plate; one end of the second moving plate, far away from the first moving plate, is provided with a tungsten electrode; the tungsten electrode is used as a negative electrode; a medium-frequency pulse generator and a high-frequency pulse generator are arranged in the arc ignition box; after entering an arc striking box, the power supply passes through a medium-frequency pulse generator and a high-frequency pulse generator in sequence and is combined and output to a tungsten electrode and a metal electrode to initiate an electric arc; an adjusting knob is arranged on the arc striking box; the adjusting knob can adjust the pulse frequency and the pulse width output by the pulse generator and the high-frequency pulse generator; the arc striking box comprises a rectifier bridge, a silicon controlled rectifier, an intermediate frequency step-up transformer, a spark discharger, a high-frequency transformer, an intermediate frequency oscillation capacitor and a high-frequency oscillation capacitor;
when in work, a workpiece is placed on the first base, and is conveyed to a welding position through the conveying roller and the roller on the first base, so that the manual operation is reduced, the labor intensity of operators is reduced, and simultaneously, after the workpiece reaches the welding position, the first air cylinder and the second air cylinder on the clamping plates at the two sides are started, the mounting seat is driven to move in a vertical plane through the actions of the first air cylinder and the second air cylinder, because the third cylinder is arranged on the mounting seat, after the mounting seat moves to a fixed position, the fixed plate arranged on the third extension rod of the third cylinder is pressed on the surface of the workpiece to fix the workpiece, and simultaneously, after the workpiece is pressed by the fixing plate, the third cylinder is started to drive the fixing plate to move oppositely, the workpiece below the fixing plate moves under the action of the balls, therefore, the width of the welding seam between the workpieces is adjusted to be proper, and meanwhile, after the workpieces are fixed, the materials of the workpieces are placed into the test clamp groove in the fixing plate.The same test block, later, start electric jar one to electric jar three, through the motion of accurate control electric jar one to electric jar three, drive extension bar four, movable plate one and movable plate two motion, thereby the angle between the tungsten utmost point of adjustment installation at two tail ends of movable plate and the work piece, thereby be convenient for striking and welding, effect and quality after the improvement work piece welding, simultaneously, through the motion of accurate control electric jar one to electric jar three, can realize tungsten utmost point automatic movement when formal welding, weld, reduce manual operation, improve welding quality's stability, simultaneously, after supplying power to the intermediate frequency pulse generator in the striking box, VRBBy R5To C2Charging at t1Time Vφ2To reach VDZDZ breakdown, rapid SCR turn-on, VL1＝Vφ2＝VDZForm the first positive peak, thereafter C2And L1Generating electromagnetic oscillation; first is C2Through L1Positive discharge followed by L1To C2Reversely charge until t2End of time reverse charging, VL1＝Vφ2A first inverted peak is reached; at this time C2And through L1Reverse discharge, whereby the SCR is forced to block by the reverse voltage, C2Only by means of a diode D connected in parallel with the SCR for reverse discharge and then for forward charging until t3End of time, VL1＝Vφ2Reaching a second positive peak; at this time C2And through L1Discharge in the forward direction, but stopped because SCR has been blocked, VL1Rapidly attenuating to zero, and ending the electromagnetic oscillation; at the same time VRBBy R5To C again2Charging, and preparing for next oscillation; this process cycles through until VRBLess than VDZUntil then, is at L1Thereby obtaining the amplitude value Vφ2Intermediate frequency pulse voltage VL1(ii) a Then, the high-frequency pulse generator is electrified to work, and after the high-frequency pulse generator is electrified, Vφ2′Through Tφ2Primary side inductance L of2To C4Fast charge (due to time constant L)2C4Very small) when Vφ2′To reach VFD(kind of electrode Material by FDAnd air gap size), a spark discharge occurs, the air gap of FD approaches an electrical short circuit condition, Vφ2′Quickly decreases to a lower value (from T)φ1Determined by the equivalent short circuit impedance) and then C has been charged4Will pass through the spark gap and L2Energy exchange takes place, so that high-frequency electromagnetic oscillations are formed in the circuit, via Tφ2The coupling can output high frequency and high voltage, and in the process of electromagnetic oscillation, the circuit has equivalent resistance formed by spark gap and wire, so that the oscillation process is a damped oscillation process. After the end of one-time ringing, the same process will occur in the other half cycle of the intermediate frequency, and the number and width of the ringing of the high frequency pulse determined by the frequency and width of the intermediate frequency pulse are formed by cycling.
Preferably, a protection plate is arranged at one end of the second moving plate far away from the first moving plate; the protection plate is C-shaped and surrounds the tungsten electrode; the interior of the protection plate is hollow; micropores which are uniformly distributed are formed in the surface, facing the tungsten electrode, of the protection plate; the micropores are communicated with the inside of the protection plate; the hollow space in the protection plate is communicated with an external inert gas source through a pipeline; the protective plate is provided with a rotating shaft; the rotating shaft is arranged on the second moving plate; the protection plate can rotate freely; a motor is installed at one end, far away from the first moving plate, of the second moving plate; the output shaft of the motor is connected with the rotating shaft through a synchronous belt;
when the welding device works, after the distance and the angle between the tungsten electrode and a workpiece are adjusted to be in a proper range, the motor is started, the protection plate is driven to move by the motor to be close to the tungsten electrode, meanwhile, in the welding process, an external air source is opened, inert gas is dispersed to the tungsten electrode and the position near a welding point through the protection plate and the micropores on the protection plate to protect the welding process, the workpiece at the welding point in the welding process is prevented from being oxidized, the welding effect of the workpiece is improved, meanwhile, the protection gas can be more uniformly distributed near the tungsten electrode through the micropores on the protection plate, the protection failure caused by the uneven distribution of the protection gas is avoided, meanwhile, the consumption of the protection gas in the welding process is reduced through the uniform distribution of the gas, the production cost is reduced, meanwhile, after the welding is finished, the motor is started again to enable the protection plate to rotate, and the protection plate is far away from the tungsten electrode, the end faces of the tungsten electrode and the second moving plate are cleaned after welding is finished, and meanwhile, the protective plate can prevent molten liquid generated during welding from splashing in the welding process to generate potential safety hazards.
Preferably, a plurality of welding wire guide rings are arranged on the upper surface of the second moving part; the welding wire guide rings are uniformly arranged along the length direction of the second moving plate, and the plurality of welding wire guide rings are all positioned on the same straight line; the protective plate is provided with a through hole; a welding wire guide ring is arranged on the end face of one end, far away from the first moving plate, of the second moving plate; the welding wire guide ring is parallel to the tungsten electrode; the welding wires pass through the passing holes after passing through the welding wire guide rings on the upper surfaces of the second moving plate and finally reach the welding wire guide rings on the two end surfaces of the moving plate; when the second moving plate rotates, the angle of the welding wire is driven to change; the upper surface of the fixing plate is provided with a test clamp groove; the bottom of the test clamp groove is provided with a test electrode; the test electrode is electrically connected with the positive electrode of the power supply;
when the welding device works, when a tungsten electrode is welded, the welding wire is conveyed to a welding point through the welding wire guide ring, the welding effect is ensured to be stable, meanwhile, the welding wire reaches the welding point after passing through a through hole on the protection plate, the protection plate can be driven to move slightly by the operation of the motor in the welding process, so that the angle when the welding wire reaches the welding point is changed, the welding quality is improved, meanwhile, before the distance and the angle between the tungsten electrode and a workpiece are adjusted, the tungsten electrode is controlled to touch the test block, the arc striking effect and the arc stability of the arc striking box are tested, meanwhile, the pulse frequency and the pulse width output from the arc striking box are adjusted by the touch of the tungsten electrode to the test block, so that the size and the intensity of the arc between the tungsten electrode and the workpiece are proper, the phenomenon that the arc intensity is too high, the workpiece is punctured or the arc intensity is low, the normal and continuous work is not realized, the production is influenced, and after the test is finished, and (4) moving away the tungsten electrode, taking down the test block, adjusting the distance and the angle between the tungsten electrode and the workpiece to a proper range, and formally starting welding.
Preferably, an electric cylinder III is installed inside the second moving plate; a connecting rod is fixedly connected to a fourth extension rod of the third electric cylinder; the connecting rod is fixedly connected with the tungsten electrode; the connecting rod is made of a non-conductor material; the tungsten electrode can freely move in the second moving plate along the length direction of the second moving plate; the contact part of the interior of the second moving plate and the tungsten electrode is made of a non-conductor material; an annular scraper is arranged on the end face of the second moving plate; the inner side surface of the annular scraper is tightly attached to the surface of the tungsten electrode;
when the welding device works, after the angle between the tungsten electrode and a workpiece is adjusted, the electric cylinder four is started, the extension rod four on the electric cylinder four is moved, the tungsten electrode is connected with the extension rod four through the connecting rod, so that the extension and retraction of the tungsten electrode are controlled through the movement of the extension rod four, the distance between the tungsten electrode and the workpiece is adjusted, the quality and the effect of the workpiece after welding are further improved, meanwhile, after the welding is finished, the electric cylinder four is started, the extension rod four is controlled to retract, the tungsten electrode is completely retracted into the moving plate two, the tungsten electrode is prevented from being exposed to the outside after the welding is finished, accidental collision is avoided, the tungsten electrode is damaged, meanwhile, the extension length of the tungsten electrode during the welding is ensured to be in a proper range through accurately controlling the movement of the electric cylinder four, the distance between the tungsten electrode and the workpiece during the welding is proper, the welding effect and quality are improved, and meanwhile, the annular scraper blade arranged on the two end faces of the moving plate is arranged, can stretch out and the in-process of withdrawal at the tungsten utmost point, through the mode of hugging closely with the tungsten utmost point surface, clear away the welding slag of adhesion when the welding on the tungsten utmost point surface, guarantee the clean and tidy of tungsten utmost point, avoid the welding slag on the tungsten utmost point to influence welded effect and quality.
Preferably, the annular scraper is made of rubber material; a hard scraping blade is arranged on the inner side surface of the annular scraping plate; the hard scraping blade is tightly attached to the surface of the tungsten electrode; the hard scraping blades are alternately distributed on the periphery of the inner side surface and in the length direction; an air bag is arranged on the extension rod IV of the electric cylinder III; the air bag is annular; a pressure plate is arranged on the extension rod IV; the air bag is positioned between the pressure plate and the electric cylinder III; an expansion cavity is formed in the annular scraper; the thickness of the side wall of the expansion cavity close to the tungsten electrode is smaller than that of the side wall far away from the tungsten electrode; the expansion cavity is communicated with the air bag through a pipeline;
the during operation, start when electricity jar four, when control extension bar four begins to retract, install the gasbag on extension bar four and receive the extrusion of the clamp plate on extension bar four, pressure in the gasbag increases, gas in the gasbag enters into the inflation chamber in the annular scraper blade, thereby make the contact between annular scraper blade and the tungsten utmost point inseparabler, and simultaneously, when extension bar four retracts, the tungsten utmost point is driven in step, begin to retract, through the inseparabler contact of annular scraper blade, improve the clearance effect of annular scraper blade to the welding slag of adhesion on the tungsten utmost point, and simultaneously, because the equal alternate distribution of stereoplasm doctor-bar in the inboard face border and length direction, the tungsten utmost point all receives the clearance at retraction in-process whole lateral surface, improve the clearance effect of annular scraper blade to the tungsten utmost point.
An arc striking method of an electric welding machine is suitable for the arc striking device of the electric welding machine; the method comprises the following steps:
s1: placing a workpiece to be welded on a first base, conveying the workpiece to a proper position through a conveying roller and a ball on the first base, starting a first air cylinder and a second air cylinder on clamping plates on two sides, adjusting the position of a mounting seat to enable a fixing plate on the mounting seat to be tightly pressed on the surface of the workpiece, then starting a third air cylinder, pushing the two workpieces to approach each other, adjusting the distance between the two workpieces to enable the width of a welding seam to be proper, and then placing a test block which is made of the same material as the workpiece to be welded in a test clamping groove on the fixing plate;
s2: on the basis of the step S1, switching on a power supply, starting an arc striking box, controlling the first electric cylinder to the fourth electric cylinder to work, enabling a tungsten electrode to be close to the test block, testing the arc striking effect, and meanwhile, generating stable and reliable electric arc intensity and stability between the tungsten electrode and the test block through adjustment of an adjusting knob on the arc striking box;
s3: after the step S2 is completed, the test block is taken down, the first electric cylinder to the third electric cylinder are controlled to operate, and the distance between the tungsten electrode and the workpiece is adjusted; starting the electric cylinder IV according to the hardness of the workpiece to be processed, and adjusting the distance between the tungsten electrode and the workpiece to be within the range of 1-4 mm;
s4: on the basis of the step S3, adjusting the angle of the welding position of the tungsten electrode and the workpiece according to the angle change of the welding interface between the workpieces to be welded, and controlling the angle between the welding position of the tungsten electrode and the workpiece within the range of 5-15 degrees;
s5: selecting whether to use a welding wire according to the material of a welding workpiece; when the welding wire is used, the welding wire is sent to the welding position of the tungsten electrode on the workpiece through the welding wire guide ring, meanwhile, the motor is controlled to operate, the protection plate is enabled to be close to the tungsten electrode, and inert protection gas is released around the tungsten electrode through the protection plate.
The invention has the following beneficial effects:
1. according to the arc striking device and the arc striking method of the electric welding machine, the arc striking box and the second moving plate are arranged, so that the length of an electrode wire of a welding gun is fully reduced, the phenomenon that a large equivalent inductance is generated in an overlong circuit to block arc striking is avoided, meanwhile, the arc striking box is arranged on the second moving plate, the arc striking box is enabled to be close to a tungsten electrode, the energy attenuation of high-frequency current output by the arc striking box is reduced, and the arc striking effect of the arc striking box is improved.
2. According to the arc striking device and the arc striking method of the electric welding machine, the third electric cylinder, the air bag and the annular scraper are arranged, so that the distance between a tungsten electrode and a workpiece can be accurately controlled in the welding process, the welding effect is improved, meanwhile, when the tungsten electrode retracts, an expansion cavity in the annular scraper can be inflated through the air bag, the contact force of the annular scraper to the tungsten electrode is improved, and the cleaning effect of the annular scraper to the tungsten electrode is improved.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a schematic structural view of an arc striking device of the present invention;
FIG. 2 is a partial cross-sectional view of a second moving plate of the arc striking device;
FIG. 3 is an enlarged view of a portion of FIG. 1 at A;
FIG. 4 is an enlarged view of a portion of FIG. 2 at B;
FIG. 5 is a flow chart of a method of the present invention;
FIG. 6 is a schematic diagram of the circuit within the arc ignition box of the arc ignition device;
in the figure: base 1, conveying roller 11, ball 12, splint 2, vertical slider 21, cylinder 22, cylinderSecond 23, a mounting seat 24, a third cylinder 25, a fixed plate 251, a rubber layer 252, a test clamp groove 253, a second base 3, a universal wheel 31, a first electric cylinder 32, a fourth extension rod 321, a first moving plate 33, a second electric cylinder 331, a second moving plate 34, a second electric cylinder 341, a third electric cylinder 342, an air bag 343, a pressing plate 344, a connecting rod 345, an arc striking box 35, an adjusting knob 351, a tungsten electrode 36, an annular scraper 361, a welding wire guide ring 37, a protection plate 38, a rotating shaft 381, a motor 382, a rectifier bridge RB, a silicon controlled rectifier SCR and a medium-frequency step-up transformer Tφ1Spark discharger FD and high-frequency transformer Tφ2An intermediate frequency oscillation capacitor C2High frequency oscillation capacitor C4。
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 6, the arc striking device of the electric welding machine according to the present invention includes a base 1, wherein a plurality of uniformly distributed conveying rollers 11 are mounted on the base 1; a plurality of balls 12 which are uniformly distributed are arranged on the base I1; the conveying roller 11 is positioned on the left side of the ball 12 and is not contacted with the ball; the highest point of the conveying roller 11 and the highest point of the ball 12 are at the same height; a clamping plate 2 is arranged on the base I1; the number of the clamping plates 2 is two, the clamping plates are symmetrically distributed on two sides of the base I1, and the clamping plates and the base I are mirror images; the ball 12 is positioned on the first base 1 between the clamping plates 2; a groove is formed in the side surface of the clamping plate 2 facing the first base 1; a vertical sliding groove is formed in the vertical side wall of the groove; a horizontal sliding groove is formed in the horizontal side wall of the groove above the groove; a vertical sliding block 21 is arranged in the vertical sliding groove in a sliding manner; a horizontal sliding block is arranged in the horizontal sliding groove in a sliding manner; a first cylinder 22 is mounted on the vertical sliding block 21; a second air cylinder 23 is mounted on the horizontal sliding block; a mounting seat 24 is fixedly mounted on a first extension rod of the first air cylinder 22; a second extension rod of the second air cylinder 23 is fixedly connected to the mounting seat 24; a third air cylinder 25 is fixedly arranged on the mounting seat 24; a fixing plate 251 is arranged on a third extension rod of the cylinder III 25; the fixing plate 251 is positioned above the first base 1; lower table of the fixing plate 251A rubber layer 252 is mounted on the surface; a common metal electrode is arranged in the rubber layer 252; the metal electrode is connected to the positive electrode of a power supply; a second base 3 is arranged on the right side of the first base 1; the lower surface of the second base 3 is provided with a universal wheel 31; a first electric cylinder 32 is arranged on the upper surface of the second base 3; a first moving plate 33 is hinged above a fourth extension rod 321 of the first electric cylinder 32; a second electric cylinder 341331 is arranged between the fourth extension rod 321 and the first moving plate 33; two ends of the second electric cylinder 341331 are respectively hinged to the left side surface of the fourth extension rod 321 and the lower surface of the first moving plate 33; one end of the first moving plate 33, far away from the fourth extension bar 321, is hinged with a second moving plate 34; a third electric cylinder 342 is arranged between the first moving plate 33 and the second moving plate 34; two ends of the third electric cylinder 342 are respectively hinged to the lower surface of the first moving plate 33 and the lower surface of the second moving plate 34; the second electric cylinder 341331 and the third electric cylinder 342 are respectively positioned at two ends of the first moving plate 33 at the hinge point of the first moving plate 33; an arc ignition box 35 is arranged on the upper surface of the second moving plate 34; one end of the second moving plate 34, which is far away from the first moving plate 33, is provided with a tungsten electrode 36; the tungsten electrode 36 serves as a negative electrode; a medium-frequency pulse generator and a high-frequency pulse generator are arranged in the arc ignition box 35; after entering the arc striking box 35, the power supply passes through the intermediate frequency pulse generator and the high frequency pulse generator in sequence and is combined and output to the tungsten electrode 36 and the metal electrode to initiate electric arc; an adjusting knob 351 is arranged on the arc ignition box 35; the adjusting knob 351 can adjust the pulse frequency and the pulse width output by the pulse generator and the high-frequency pulse generator; the arc striking box 35 comprises a rectifier bridge RB, a silicon controlled rectifier SCR and a medium-frequency step-up transformer Tφ1Spark discharger FD and high-frequency transformer Tφ2An intermediate frequency oscillation capacitor C2And a high-frequency oscillation capacitor C4；
During operation, place the work piece on base 1, transport the work piece to the welding position through conveying roller 11 and the roller on base 1, reduce manual operation, reduce operating personnel's intensity of labour, simultaneously, after the work piece reachd the welding position, cylinder one 22 and cylinder two 23 on the splint 2 of both sides start, through the action of cylinder one 22 and cylinder two 23, drive mount pad 24 and remove in vertical plane, because cylinder three 25 ann movesThe device is arranged on the mounting seat 24, after the mounting seat 24 moves to a fixed position, a fixed plate 251 arranged on a third extending rod of a third air cylinder 25 is pressed on the surface of a workpiece to fix the workpiece, meanwhile, after the workpiece is pressed by the fixed plate 251, the third air cylinder 25 is started to drive the fixed plate 251 to move oppositely, the workpiece below the fixed plate 251 moves under the action of balls 12, so that the width of a welding seam between the workpieces is adjusted to be a proper size, meanwhile, after the workpiece is fixed, a test block with the same material as the workpiece is placed in a test clamp groove 253 on the fixed plate 251, then, a first electric cylinder 32 to a third electric cylinder 342 are started, the fourth extending rod 321, a first moving plate 33 and a second moving plate 34 are driven to move by precisely controlling the movement of the first electric cylinder 32 to the third electric cylinder 342, so that the angle between a tungsten electrode 36 arranged at the tail end of the second moving plate 34 and the workpiece is adjusted, thereby being convenient for arc striking and welding, the effect and the quality of the welded workpiece are improved, meanwhile, the tungsten electrode 36 can be automatically moved during formal welding through accurately controlling the movement of the first electric cylinder 32 to the third electric cylinder 342, welding is carried out, manual operation is reduced, the stability of welding quality is improved, and meanwhile, after the medium-frequency pulse generator in the arc striking box 35 is powered on, the V isRBBy R5To C2Charging at t1Time Vφ2To reach VDZDZ breakdown, rapid SCR turn-on, VL1＝Vφ2＝VDZForm the first positive peak, thereafter C2And L1Generating electromagnetic oscillation; first is C2Through L1Positive discharge followed by L1To C2Reversely charge until t2End of time reverse charging, VL1＝Vφ2A first inverted peak is reached; at this time C2And through L1Reverse discharge, whereby the SCR is forced to block by the reverse voltage, C2Only by means of a diode D connected in parallel with the SCR for reverse discharge and then for forward charging until t3End of time, VL1＝Vφ2Reaching a second positive peak; at this time C2And through L1Discharge in the forward direction, but stopped because SCR has been blocked, VL1Rapidly attenuating to zero, and ending the electromagnetic oscillation; at the same time VRBBy R5Again, theTo C2Charging, and preparing for next oscillation; this process cycles through until VRBLess than VDZUntil then, is at L1Thereby obtaining the amplitude value Vφ2Intermediate frequency pulse voltage VL1(ii) a Then, the high-frequency pulse generator is electrified to work, and after the high-frequency pulse generator is electrified, Vφ2′Through Tφ2Primary side inductance L of2To C4Fast charge (due to time constant L)2C4Very small) when Vφ2′To reach VFD(Depending on the kind of electrode material of the FD and the size of the air gap), spark discharge occurs, the air gap of the FD approaches an electrical short-circuit state, Vφ2′Quickly decreases to a lower value (from T)φ1Determined by the equivalent short circuit impedance) and then C has been charged4Will pass through the spark gap and L2Energy exchange takes place, so that high-frequency electromagnetic oscillations are formed in the circuit, via Tφ2The coupling can output high frequency and high voltage, and in the process of electromagnetic oscillation, the circuit has equivalent resistance formed by spark gap and wire, so that the oscillation process is a damped oscillation process. After the end of one-time ringing, the same process will occur in the other half cycle of the intermediate frequency, and the number and width of the ringing of the high frequency pulse determined by the frequency and width of the intermediate frequency pulse are formed by cycling.
As an embodiment of the present invention, a protection plate 38 is installed on one end of the second moving plate 34 away from the first moving plate 33; the protective plate 38 is C-shaped and surrounds the tungsten electrode 36; the interior of the guard plate 38 is hollow; the surface of the protection plate 38 facing the tungsten electrode 36 is provided with uniformly arranged micropores; the micropores are communicated with the protection plate 38; the hollow space inside the protection plate 38 is communicated with an external inert gas source through a pipeline; the protective plate 38 is provided with a rotating shaft 381; the rotating shaft 381 is arranged on the second moving plate 34; the guard plate 38 is freely rotatable; one end of the second moving plate 34, which is far away from the first moving plate 33, is provided with a motor 382; the output shaft of the motor 382 is connected with the rotating shaft 381 through a synchronous belt;
when the welding device works, after the distance and the angle between the tungsten electrode 36 and a workpiece are adjusted to be in a proper range, the motor 382 is started, the protection plate 38 is driven by the motor 382 to move, so that the protection plate 38 is close to the tungsten electrode 36, meanwhile, in the welding process, an external gas source is opened, inert gas is dispersed to the tungsten electrode 36 and the position near a welding point through the protection plate 38 and micropores on the protection plate 38, the welding process is protected, the workpiece at the welding point in the welding process is prevented from being oxidized, the welding effect of the workpiece is improved, meanwhile, the protection gas can be more uniformly distributed near the tungsten electrode 36 through the micropores on the protection plate 38, the failure of protection caused by the uneven distribution of the protection gas is avoided, meanwhile, the using amount of the protection gas in the welding process is reduced through the uniform distribution of the gas, the production cost is reduced, meanwhile, after the welding is completed, the motor 382 is started again, the protection plate 38 is rotated to be away from the tungsten electrode 36, so that the tungsten electrode 36 and the end face of the second moving plate 34 can be cleaned conveniently after welding is finished, and meanwhile, the protection plate 38 can prevent molten liquid generated in the welding process from splashing to generate potential safety hazards.
As an embodiment of the present invention, a plurality of wire guide rings 37 are disposed on the upper surface of the second movable member; the welding wire guide rings 37 are uniformly arranged along the length direction of the second moving plate 34, and the welding wire guide rings 37 are all positioned on the same straight line; the protection plate 38 is provided with a through hole; a welding wire guide ring 37 is arranged on the end face of one end of the second moving plate 34 far away from the first moving plate 33; the welding wire guide ring 37 is parallel to the tungsten electrode 36; the welding wire passes through the passing hole after passing through the welding wire guide ring 37 on the upper surface of the second moving plate 34 and finally reaches the welding wire guide ring 37 on the end surface of the second moving plate 34; when the second moving plate 34 rotates, the angle of the welding wire is driven to change; the upper surface of the fixing plate 251 is provided with a test clamp groove 253; the bottom of the test clip groove 253 is provided with a test electrode; the test electrode is electrically connected with the positive electrode of the power supply;
during operation, when the tungsten electrode 36 is welded, the welding wire is conveyed to the welding point through the welding wire guide ring 37, so that the welding effect is stable, meanwhile, the welding wire reaches the welding point after passing through the through hole on the protection plate 38, in the welding process, the protection plate 38 is driven to move slightly through the operation of the motor 382, so that the angle of the welding wire reaching the welding point is changed, the welding quality is improved, meanwhile, before the distance and the angle between the tungsten electrode 36 and the workpiece are adjusted, the tungsten electrode 36 is controlled to touch the test block, the arc striking effect and the arc stability of the arc striking box 35 are tested, meanwhile, the pulse frequency and the pulse width output from the arc striking box 35 are adjusted through the touch of the tungsten electrode 36 to the test block, so that the size and the intensity of the arc between the tungsten electrode 36 and the workpiece are proper, the phenomenon that the arc intensity is too large, the workpiece is punctured or the arc intensity is small, the normal and continuous operation cannot be carried out, and the production is influenced is avoided, after the test is completed, the tungsten electrode 36 is removed, the test block is removed, the distance and the angle between the tungsten electrode 36 and the workpiece are adjusted to a proper range, and the welding is formally started.
As an embodiment of the present invention, a third cylinder 342 is installed inside the second moving plate 34; a connecting rod 345 is fixedly connected to the fourth extension rod 321 of the third electric cylinder 342; the connecting rod 345 is fixedly connected with the tungsten electrode 36; the connecting rod 345 is made of a non-conductor material; the tungsten electrode 36 can freely move in the second moving plate 34 along the length direction of the second moving plate 34; the contact part of the interior of the second moving plate 34 and the tungsten electrode 36 is made of non-conductor materials; an annular scraper 361 is arranged on the end surface of the second moving plate 34; the inner side surface of the annular scraper 361 is tightly attached to the surface of the tungsten electrode 36;
during operation, after the angle between the tungsten electrode 36 and the workpiece is adjusted, the electric cylinder four is started, the extension rod four 321 on the electric cylinder four is moved, the tungsten electrode 36 is connected with the extension rod four 321 through the connecting rod 345, so that the extension and retraction of the tungsten electrode 36 are controlled through the movement of the extension rod four 321, the distance between the tungsten electrode 36 and the workpiece is adjusted, the welded quality and effect of the workpiece are further improved, meanwhile, after the welding is completed, the electric cylinder four is started, the extension rod four 321 is controlled to retract, the tungsten electrode 36 is completely retracted into the moving plate two 34, the tungsten electrode 36 is prevented from being exposed outside after the welding is completed, accidental collision is caused, the tungsten electrode 36 is damaged, meanwhile, the extension length of the tungsten electrode 36 during welding is ensured to be within a proper range through accurate control of the movement of the electric cylinder four, and the distance between the tungsten electrode 36 and the workpiece is proper in the welding process, the welding effect and the welding quality are improved, meanwhile, the annular scraping plate 361 arranged on the end face of the second moving plate 34 can remove welding slag adhered to the surface of the tungsten electrode 36 during welding in a mode of being tightly attached to the surface of the tungsten electrode 36 in the process of extending and retracting the tungsten electrode 36, the neatness of the tungsten electrode 36 is guaranteed, and the welding slag on the tungsten electrode 36 is prevented from influencing the welding effect and the welding quality.
As an embodiment of the present invention, the annular scraper 361 is made of a rubber material; a hard scraper is arranged on the inner side surface of the annular scraper 361; the hard scraper is tightly attached to the surface of the tungsten electrode 36; the hard scraping blades are alternately distributed on the periphery of the inner side surface and in the length direction; an air bag 343 is arranged on the fourth 321 extending rod of the third electric cylinder 342; the balloon 343 is annular; a pressing plate 344 is arranged on the fourth extension rod 321; the air bag 343 is positioned between the pressure plate 344 and the electric cylinder III 342; an expansion cavity is formed in the annular scraping plate 361; the thickness of the side wall of the expansion cavity close to the tungsten electrode 36 is smaller than that of the side wall far away from the tungsten electrode 36; the expansion cavity is communicated with the air bag 343 through a pipeline;
during operation, when the electric cylinder IV is started, the extension rod IV 321 is controlled to retract, the air bag 343 mounted on the extension rod IV 321 is squeezed by the pressing plate 344 on the extension rod IV 321, the pressure in the air bag 343 is increased, and air in the air bag 343 enters the expansion cavity in the annular scraping plate 361, so that the annular scraping plate 361 and the tungsten electrode 36 are in closer contact, meanwhile, when the extension rod IV 321 retracts, the tungsten electrode 36 is synchronously driven to retract, and the annular scraping plate 361 is in closer contact, so that the cleaning effect of the annular scraping plate 361 on welding slag adhered to the tungsten electrode 36 is improved, meanwhile, as the hard scraping plates are alternately distributed on the inner surface circumference and the length direction, the whole outer side surface of the tungsten electrode 36 is cleaned in the retracting process, and the cleaning effect of the annular scraping plate 361 on the tungsten electrode 36 is improved.
An arc striking method of an electric welding machine is suitable for the arc striking device of the electric welding machine; the method comprises the following steps:
s1: placing a workpiece to be welded on a first base 1, conveying the workpiece to a proper position through a conveying roller 11 and a ball 12 on the first base 1, starting a first air cylinder 22 and a second air cylinder 23 on clamping plates 2 on two sides, adjusting the position of a mounting seat 24 to enable a fixing plate 251 on the mounting seat 24 to be tightly pressed on the surface of the workpiece, then starting a third air cylinder 25 to push the two workpieces to be close to each other, adjusting the distance between the two workpieces to enable the width of a welding seam to be proper, and then placing a test block which is the same as the material of the workpiece to be welded in a test clamping groove 253 on the fixing plate 251;
s2: on the basis of the step S1, switching on a power supply, then starting the arc ignition box 35, controlling the first cylinder to the fourth cylinder to work, enabling the tungsten electrode 36 to be close to the test block, testing the arc ignition effect, and meanwhile, generating stable and reliable arc intensity and stability between the tungsten electrode 36 and the test block through adjustment of an adjusting knob 351 on the arc ignition box 35;
s3: after the step S2 is completed, the test block is removed, the first cylinder 32 to the third cylinder 342 are controlled to operate, and the distance between the tungsten electrode 36 and the workpiece is adjusted; starting the electric cylinder IV according to the hardness of the workpiece to be processed, and adjusting the distance between the tungsten electrode 36 and the workpiece to be within the range of 1-4 mm;
s4: on the basis of the step S3, adjusting the angle of the welding position of the tungsten electrode 36 and the workpiece according to the angle change of the welding interface between the workpieces to be welded, and controlling the angle between the tungsten electrode 36 and the welding position of the workpiece within the range of 5-15 degrees;
s5: selecting whether to use a welding wire according to the material of a welding workpiece; in use, the welding wire is fed through wire guide ring 37 to the location where tungsten electrode 36 is to be welded to the workpiece, and motor 382 is controlled to operate so that shield 38 is adjacent to tungsten electrode 36 and so that inert shielding gas is released around tungsten electrode 36 through shield 38.
The specific working process is as follows:
during operation, place the work piece on base 1, transport the work piece to welding position through conveying roller 11 and the roller on base 1, simultaneously, after the work piece reachd welding position, cylinder one 22 and cylinder two 23 on the splint 2 of both sides start, through the action of cylinder one 22 and cylinder two 23, drive mount pad 24 and remove in vertical plane, because cylinder three 25 installs on mount pad 24, after mount pad 24 removes the fixed position, the fixed plate 251 of the installation on cylinder three 25 extension bar three compresses tightly at the work piece surface, simultaneously, after the work piece is compressed tightly by fixed plate 251, start cylinder three 25, thereby drive fixed plate 251 and remove in opposite directions, the work piece of fixed plate 251 below 251, the work piece 251 of fixed plate below compresses tightly the back, thereby the work piece is pressed tightly to the fixed plate surfaceThe workpiece is moved under the action of the balls 12, meanwhile, after the workpiece is fixed, a test block which is made of the same material as the workpiece is placed into the test clamp groove 253 on the fixing plate 251, then, the first electric cylinder 32 to the third electric cylinder 342 are started, the movement of the first electric cylinder 32 to the third electric cylinder 342 is precisely controlled, the extension rod four 321, the moving plate one 33 and the moving plate two 34 are driven to move, the angle between the tungsten electrode 36 arranged at the tail end of the moving plate two 34 and the workpiece is adjusted, and meanwhile, after the medium-frequency pulse generator in the arc striking box 35 is powered on, the V isRBBy R5To C2Charging at t1Time Vφ2To reach VDZDZ breakdown, rapid SCR turn-on, VL1＝Vφ2＝VDZForm the first positive peak, thereafter C2And L1Generating electromagnetic oscillation; first is C2Through L1Positive discharge followed by L1To C2Reversely charge until t2End of time reverse charging, VL1＝Vφ2A first inverted peak is reached; at this time C2And through L1Reverse discharge, whereby the SCR is forced to block by the reverse voltage, C2Only by means of a diode D connected in parallel with the SCR for reverse discharge and then for forward charging until t3End of time, VL1＝Vφ2Reaching a second positive peak; at this time C2And through L1Discharge in the forward direction, but stopped because SCR has been blocked, VL1Rapidly attenuating to zero, and ending the electromagnetic oscillation; at the same time VRBBy R5To C again2Charging, and preparing for next oscillation; this process cycles through until VRBLess than VDZUntil then, is at L1Thereby obtaining the amplitude value Vφ2Intermediate frequency pulse voltage VL1(ii) a Then, the high-frequency pulse generator is electrified to work, and after the high-frequency pulse generator is electrified, Vφ2′Through Tφ2Primary side inductance L of2To C4Fast charge (due to time constant L)2C4Very small) when Vφ2′To reach VFD(Depending on the kind of electrode material of the FD and the size of the air gap), spark discharge occurs, the air gap of the FD approaches an electrical short-circuit state, Vφ2′Quickly decreases to a lower value (from T)φ1Determined by the equivalent short circuit impedance) and then C has been charged4Will pass through the spark gap and L2Energy exchange takes place, so that high-frequency electromagnetic oscillations are formed in the circuit, via Tφ2The coupling can output high frequency and high voltage, and in the process of electromagnetic oscillation, the circuit has equivalent resistance formed by spark gap and wire, so that the oscillation process is a damped oscillation process. After the first-time decaying oscillation is finished, the same process will occur in the other half cycle of the intermediate frequency, and the oscillation times and the width of the high-frequency pulse determined by the frequency and the pulse width of the intermediate frequency pulse are formed after the cycle; after the distance and the angle between the tungsten electrode 36 and the workpiece are adjusted to a proper range, the motor 382 is started, the protection plate 38 is driven to move through the motor 382, so that the protection plate 38 is close to the tungsten electrode 36, meanwhile, in the welding process, an external gas source is opened, inert gas is dispersed to the tungsten electrode 36 and the vicinity of a welding point through the protection plate 38 and micropores on the protection plate 38, and meanwhile, after the welding is finished, the motor 382 is started again, so that the protection plate 38 rotates and is far away from the tungsten electrode 36; when the tungsten electrode 36 is welded, a welding wire is conveyed to a welding point through the welding wire guide ring 37, meanwhile, in the welding process, the protection plate 38 is driven to slightly move through the operation of the motor 382, the angle of the welding wire reaching the welding point is changed, and meanwhile, before the distance and the angle between the tungsten electrode 36 and a workpiece are adjusted, the tungsten electrode 36 is controlled to touch a test block, and the arc striking effect and the arc stability of the arc striking box 35 are tested; after the angle between the tungsten electrode 36 and the workpiece is adjusted, starting the fourth electric cylinder to move the fourth extension rod 321 on the fourth electric cylinder, and controlling the extension and retraction of the tungsten electrode 36 through the movement of the fourth extension rod 321 to adjust the distance between the tungsten electrode 36 and the workpiece because the tungsten electrode 36 is connected with the fourth extension rod 321 through the connecting rod 345; when the electric cylinder four is started and the control extension rod four 321 starts to retract, the electric cylinder four is installedThe air bag 343 on the four extension bars 321 is pressed by the pressure plate 344 on the four extension bars 321, the pressure in the air bag 343 is increased, the gas in the air bag 343 enters an expansion cavity in the annular scraper 361, meanwhile, when the four extension bars 321 retract, the tungsten electrode 36 is synchronously driven to retract, and the annular scraper 361 clears welding slag adhered on the tungsten electrode 36.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The utility model provides an electric welding machine striking device, includes base (1), its characterized in that: a plurality of uniformly distributed conveying rollers (11) are arranged on the base I (1); a plurality of balls (12) which are uniformly distributed are arranged on the base I (1); the conveying roller (11) is positioned on the left side of the ball (12) and is not contacted with the ball; the highest point of the conveying roller (11) and the highest point of the ball (12) are at the same height; a clamping plate (2) is arranged on the first base (1); the two clamping plates (2) are symmetrically distributed on two sides of the first base (1) and are mirror images; the ball (12) is positioned on the first base (1) between the clamping plates (2); a groove is formed in the side surface, facing the direction of the first base (1), of the clamping plate (2); a vertical sliding groove is formed in the vertical side wall of the groove; a horizontal sliding groove is formed in the horizontal side wall of the groove above the groove; a vertical sliding block (21) is arranged in the vertical sliding groove in a sliding manner; a horizontal sliding block is arranged in the horizontal sliding groove in a sliding manner; a first cylinder (22) is mounted on the vertical sliding block (21); a second air cylinder (23) is mounted on the horizontal sliding block; a mounting seat (24) is fixedly mounted on a first extension rod of the first air cylinder (22); a second extension rod of the second air cylinder (23) is fixedly connected to the mounting seat (24); a third air cylinder (25) is fixedly arranged on the mounting seat (24); a fixing plate (251) is mounted on a third extension rod of the third cylinder (25); the fixing plate (251) is positioned above the first base (1); a rubber layer (252) is arranged on the lower surface of the fixing plate (251); a common metal electrode is arranged in the rubber layer (252); the metal electrode is connected to the positive electrode of a power supply; a second base (3) is arranged on the right side of the first base (1); the lower surface of the second base (3) is provided with a universal wheel (31); a first electric cylinder (32) is mounted on the upper surface of the second base (3); a first moving plate (33) is hinged above an extension rod four (321) of the first electric cylinder (32); a second electric cylinder (341) (331) is arranged between the fourth extension rod (321) and the first moving plate (33); two ends of the second electric cylinder (341) (331) are respectively hinged on the left side surface of the extension rod four (321) and the lower surface of the first moving plate (33); one end, far away from the extension bar IV (321), of the first moving plate (33) is hinged with a second moving plate (34); a third electric cylinder (342) is arranged between the first moving plate (33) and the second moving plate (34); two ends of the third electric cylinder (342) are respectively hinged to the lower surface of the first moving plate (33) and the lower surface of the second moving plate (34); the second electric cylinder (341) (331) and the third electric cylinder (342) are respectively positioned at two ends of the first moving plate (33) at the hinge point of the first moving plate (33); an arc ignition box (35) is arranged on the upper surface of the second moving plate (34); one end of the second moving plate (34) far away from the first moving plate (33) is provided with a tungsten electrode (36); the tungsten electrode (36) is used as a negative electrode; a medium-frequency pulse generator and a high-frequency pulse generator are arranged in the arc ignition box (35); after entering an arc striking box (35), the power supply passes through a medium-frequency pulse generator and a high-frequency pulse generator in sequence and is combined and output to a tungsten electrode (36) and a metal electrode to initiate electric arcs; an adjusting knob (351) is arranged on the arc ignition box (35); the adjusting knob (351) can adjust the pulse frequency and the pulse width output by the pulse generator and the high-frequency pulse generator; the arc striking box (35) comprises a rectifier bridge RB, a silicon controlled rectifier SCR, an intermediate frequency step-up transformer T phi 1, a spark discharger FD, a high frequency transformer T phi 2, an intermediate frequency oscillation capacitor C2 and a high frequency oscillation capacitor C4;
a plurality of welding wire guide rings (37) are arranged on the upper surface of the second moving plate (34); the welding wire guide rings (37) are uniformly arranged along the length direction of the second moving plate (34), and the welding wire guide rings (37) are all positioned on the same straight line; the protective plate (38) is provided with a through hole; a welding wire guide ring (37) is arranged on the end face of one end, far away from the first moving plate (33), of the second moving plate (34); the welding wire guide ring (37) is parallel to the tungsten electrode (36); the welding wire passes through the wire guide ring (37) on the upper surface of the second moving plate (34) and then passes through the passing hole, and finally reaches the wire guide ring (37) on the end face of the second moving plate (34); when the second moving plate (34) rotates, the angle of the welding wire is driven to change; the upper surface of the fixing plate (251) is provided with a test clamp groove (253); the bottom of the test clip groove (253) is provided with a test electrode; the test electrode is electrically connected with the positive electrode of the power supply.
2. The arc striking device of an electric welding machine as claimed in claim 1, wherein: a protection plate (38) is arranged at one end of the second moving plate (34) far away from the first moving plate (33); the protection plate (38) is C-shaped and surrounds the tungsten electrode (36); the interior of the protection plate (38) is hollow; the surface of the protection plate (38) facing the tungsten electrode (36) is provided with uniformly arranged micropores; the micropores are communicated with the inside of the protection plate (38); the hollow space inside the protection plate (38) is communicated with an external inert gas source through a pipeline; the protection plate (38) is provided with a rotating shaft (381); the rotating shaft (381) is arranged on the second moving plate (34); the protection plate (38) can rotate freely; one end of the second moving plate (34) far away from the first moving plate (33) is provided with a motor (382); the output shaft of the motor (382) is connected with the rotating shaft (381) through a synchronous belt.
3. The arc striking device of an electric welding machine as claimed in claim 2, wherein: a third electric cylinder (342) is arranged inside the second moving plate (34); a connecting rod (345) is fixedly connected to an extension rod IV (321) of the electric cylinder III (342); the connecting rod (345) is fixedly connected with the tungsten electrode (36); the connecting rod (345) is made of a non-conductor material; the tungsten electrode (36) can freely move in the second moving plate (34) along the length direction of the second moving plate (34); the contact part of the interior of the second moving plate (34) and the tungsten electrode (36) is made of non-conductor materials; an annular scraper (361) is arranged on the end surface of the second moving plate (34); the inner side surface of the annular scraper (361) is tightly attached to the surface of the tungsten electrode (36).
4. The arc striking device of an electric welding machine as claimed in claim 3, wherein: the annular scraper (361) is made of rubber materials; a hard scraper is arranged on the inner side surface of the annular scraper (361); the hard scraping blade is tightly attached to the surface of the tungsten electrode (36); the hard scraping blades are alternately distributed on the periphery of the inner side surface and in the length direction; an air bag (343) is arranged on the extension rod IV (321) of the electric cylinder III (342); the balloon (343) is annular; a pressing plate (344) is arranged on the fourth extension rod (321); the air bag (343) is positioned between the pressure plate (344) and the electric cylinder III (342); an expansion cavity is formed in the annular scraper (361); the thickness of the side wall of the expansion cavity close to the tungsten electrode (36) is smaller than that of the side wall far away from the tungsten electrode (36); the expansion cavity is communicated with the air bag (343) through a pipeline.
5. An arc striking method of an electric welding machine is characterized in that: the method is suitable for the arc striking device of the electric welding machine as claimed in any one of the claims 1 to 4; the method comprises the following steps:
s1: placing a workpiece to be welded on a first base (1), conveying the workpiece to a proper position through a conveying roller (11) and a ball (12) on the first base (1), starting a first air cylinder (22) and a second air cylinder (23) on clamping plates (2) on two sides, adjusting the position of a mounting seat (24), enabling a fixing plate (251) on the mounting seat (24) to be tightly pressed on the surface of the workpiece, then starting a third air cylinder (25), pushing the two workpieces to be close to each other, adjusting the distance between the two workpieces, enabling the width of a welding seam to be proper, and then placing a test block which is the same as the material of the workpiece to be welded into a test clamping groove (253) on the fixing plate (251);
s2: on the basis of the step S1, switching on a power supply, then starting an arc ignition box (35), controlling a first electric cylinder (32) to a fourth electric cylinder to work, enabling a tungsten electrode (36) to be close to a test block, testing an arc ignition effect, and meanwhile, generating stable and reliable electric arc intensity and stability between the tungsten electrode (36) and the test block through adjustment of an adjusting knob (351) on the arc ignition box (35);
s3: after the step S2 is completed, the test block is taken down, the first electric cylinder (32) to the third electric cylinder (342) are controlled to operate, and the distance between the tungsten electrode (36) and the workpiece is adjusted; starting the electric cylinder IV according to the hardness of the workpiece to be processed, and adjusting the distance between the tungsten electrode (36) and the workpiece to be within the range of 1-4 mm;
s4: on the basis of the step S3, adjusting the angle of the welding position of the tungsten electrode (36) and the workpiece according to the angle change of the welding interface between the workpieces to be welded, and controlling the angle between the tungsten electrode (36) and the welding position of the workpiece to be within the range of 5-15 degrees;
s5: selecting whether to use a welding wire according to the material of a welding workpiece; when the welding wire is used, the welding wire is fed to a welding position of a tungsten electrode (36) on a workpiece through a welding wire guide ring (37), and meanwhile, a motor (382) is controlled to operate, so that a protection plate (38) is close to the tungsten electrode (36), and inert protection gas is released around the tungsten electrode (36) through the protection plate (38).
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| CN113510347B (en) * | 2021-09-02 | 2022-11-04 | 上海迈启盛机电科技有限公司 | Automatic argon arc welder of clearance |
| CN117245174A (en) * | 2023-10-07 | 2023-12-19 | 中核四0四有限公司 | Arc striking device of welding sealing machine and welding sealing machine |
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Denomination of invention: An arc starting device and its arc starting method for an electric welding machine Granted publication date: 20211207 Pledgee: Zhejiang Wenling Rural Commercial Bank Co.,Ltd. Pledgor: Zhejiang lawston Technology Co.,Ltd. Registration number: Y2024330001363 |