CN104493345A - Whole-process tracing automatic adjusting system for steel pipe pre-welding machine and control method of whole-process tracing automatic adjusting system - Google Patents
Whole-process tracing automatic adjusting system for steel pipe pre-welding machine and control method of whole-process tracing automatic adjusting system Download PDFInfo
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- CN104493345A CN104493345A CN201410661869.0A CN201410661869A CN104493345A CN 104493345 A CN104493345 A CN 104493345A CN 201410661869 A CN201410661869 A CN 201410661869A CN 104493345 A CN104493345 A CN 104493345A
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Classifications
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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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
- B23K9/235—Preliminary treatment
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
Abstract
The invention provides a whole-process tracing automatic adjusting system for a steel pipe pre-welding machine. By using the system combining a proportional overflow valve, a proportional electronic reversing valve, a pressure senor, electric control and welding, the initial pressure load of the dead zone pressure of the proportional overflow valve acting on a main oil cylinder can be lowered, the initial pressure of the main oil cylinder is insufficient to damage a steel plate and mechanical parts, the problem that the welding quality of ultra-thick, ultra-thin, ultra-small and ultra-large steel pipes cannot be guaranteed in the prior art is solved, the problems that the steel pipes are bent under pressure and have pressing marks, or welding cannot be performed due to the fact that misalignment of the steel pipes during welding moving exists are solved, cost and manpower resources are saved greatly, steel plate rejection rate is reduced, automation is achieved greatly, and production efficiency is increased.
Description
Technical field
The type of the invention belongs to belongs to the pre-welding machine made of steel tubes control system technical field of tubulation industry, and the steel pipe being specifically related to various different size carries out pre-welding machine made of steel tubes all-the-way tracking automatic adjustment system and the control method thereof of misalignment when tracking adjustment eliminates weld defect and welding in welding process in the whole process of automatic welding steel pipe.
Background technology
Prewelding is not had in longitudinal submerged arc welded pipe is in one's early years produced, until just start in second generation UOE welded pipe units to have emerged in large numbers Prewelding machine, but prewelding is now discontinuous welding, spacing is about 300mm, arrive the third generation (asking for 1968 ~ 1979 years) of UOE welded pipe units development, prewelding obtains to be focused on greatly and development, will not successively form become form successively, the pre-welding technology in this stage is laid a good foundation for pre-welding technology in the present age.Also the development of pre-welding technology can be reflected from the quality standard of steel pipe, in up-to-date relevant ocean, in low gentle acid condition pipe standards IS03183-3 and GB/T9711.3 6.3 sections, clearly propose to disapprove employing intermittent point welding, indicated the main property of prewelding form to steel pipe quality.
At present, along with the smooth enforcement of China's transfering natural gas from the west to the east project, growing to the demand of gas pipeline, simultaneously also stricter to the quality requirement of gas pipeline.Pre-welding machine made of steel tubes in large-size pipe processing, welding equipment is the crucial special equipment in transferring oil, gas steel pipes with straight production line, its effect has following: if Welding Problems does not reach required weld strength in oil, gas course of conveying, its economic loss is inestimable.Welding decides the quality of the welded seam of steel pipe in welding process, intensity plays an important role, make it to reach related standards or instructions for use according to the different size of caliber, pre-welding machine made of steel tubes welded in welding process is in the past all manually adjust, also consumptive material of not only mistaking when welding also takes human resources, and in welding quality, most of welding finished product does not all reach the requirement of tube quality yet.Form these reasons and have the 2 articles: 1st article: in welding, carry out human weld, when human weld due to welding can produce a large amount of welding bubbles, also producing the weldering eyesight influence of mist to people, to add labour intensity large, in long welding process, the work muscle power of the people welding quality that also can decline also can decline, the welding bubble simultaneously produced due to welding in welding process and whole welded seam quality cannot be ensured.Article 2: electrical control and hydraulic system have employed console switch control and electro-hydraulic reversing valve control, suppress steel pipe time cannot reach synchronous or check pressure time can only see that Pressure gauge and empirical value operate artificially.Can make in pressing process the steel tube surface of different size damage, be out of shape or weld on the problem such as defective have a strong impact on quality, be also that whole steel pipe cancels.Also can not adjust because of when adopting electro-hydraulic reversing valve in pressure release at system decompression and return, during pressure release, reversal valve commutates instantaneously and produces impulsive sound, also create a large amount of oil film in oil return line while impacting in drain charge the moment produced and affect the stability of whole lathe, also have impact on the welding quality of whole lathe in welding process and use, the requirement for operator is also very high.Due to Artificial Control and operate in cannot ensureing qualitatively of welding in welding process, just carry out Mass Control problem by detection methods, Artificial Control cannot ensure that steel pipe occurs the problems such as defect on welding with operating.Also because detection methods is limited and be also a kind of waste greatly on manpower and resource, to produce and processing cost also significantly improves, the productive profit brought is also limited.
Summary of the invention
Technical problem to be solved by this invention provides a kind of both can follow the tracks of that carrying out constantly in welded still pipe overall process monitors welding quality and pressure, the change of weld seam can according to all even standard of the quality weld seam of the pressure of welding and welding for shortcoming of the prior art, to eliminate after terminating because of pressurize the pre-welding machine made of steel tubes all-the-way tracking automatic adjustment system of the impact produced in pressure leak process, the present invention also provides the control method of above-mentioned pre-welding machine made of steel tubes all-the-way tracking automatic adjustment system again.
Following technical scheme is adopted for solving technical problem of the present invention:
A kind of pre-welding machine made of steel tubes all-the-way tracking automatic adjustment system, comprise the infrared inspection sensor be connected with pre-welding machine made of steel tubes head, described infrared inspection sensor is connected with PLC and carries out operation screen control by PLC convert information, described operation screen mainly realizes human-computer exchange information, and drive motors followed the tracks of by described operation screen joint steel pipe Prewelding machine welding gun; also comprise welded still pipe compacting pressure-retaining system, described to welded still pipe compacting pressure-retaining system be included in Set scale pressure valve on pre-welding machine made of steel tubes master cylinder in-line, proportional pressure valve is transferred to data signal analog signal transmission realizes controlling pre-welding machine made of steel tubes master cylinder in-line pressure size to operation screen, described proportional pressure valve is connected with pressure sensor respectively with ratio solenoid directional control valve, by pressure sensor, data signal to be converted into analog information by PLC by the pressure of collection and uninterrupted to be transferred to operation screen and to control, described ratio solenoid directional control valve is transformed by PLC signal and is transferred to operation screen, ratio solenoid directional control valve is by controlling the size of welding pressure roller joint close pressure, ratio solenoid directional control valve is transferred to openings of sizes that operation screen carrys out the commutation of control ratio constantly and controls pressure roller by pressure on the number signal being converted into analog information and be pressed in welding quality in welding process, described ratio solenoid directional control valve is connected with pressure sensor, described pressure sensor is arranged on the oil-in of the oil cylinder of pre-welding machine made of steel tubes, described pressure sensor is connected with operation screen.
The model of described infrared inspection sensor is VDM18-300/20/88/122/151.
Described master cylinder in-line is epicoele safety valve in parallel and cavity of resorption safety valve respectively; carry out system pressure safeguard protection; be provided with proportional pressure control valve at oil pump oil-out and carry out principal pressure control; at oil cylinder oil inlet be fuel-displacedly respectively equipped with ratio solenoid directional control valve and pressure sensor, carry out the oil stream size and the pressure size that control and detect in-line and vent line respectively.
Described infrared inspection sensor is connected with the image pick-up card of controller, and the image pick-up card of described controller connects PLC and operation screen.
A kind of control method of pre-welding machine made of steel tubes all-the-way tracking automatic adjustment system, the monitoring of steel pipe seam situation and welding quality treated by described infrared inspection sensor when pre-welding machine made of steel tubes welds, the image pick-up card of the controller be connected by PLC with infrared inspection sensor is fed back treats that the internal groove form parameter of welding line is transferred to operation screen, operation screen controls to adjust the position of welding and the size of groove, digital given unit is converted into pulse signal transmission and follows the tracks of drive motors to pre-welding machine made of steel tubes welding gun by the PLC in operation screen, pre-welding machine made of steel tubes welding gun is followed the tracks of drive motors and is moved the motion of welding gun tracking weld seam with Setting signal, operation screen is Digital Detecting and monitoring welding gun welding position simultaneously, simultaneously to welded still pipe compacting pressurize, the proportional pressure valve that the oil that oil pump is got flows through on pre-welding machine made of steel tubes master cylinder in-line carries out Stress control, oil stream controls the stroke of pre-welding machine made of steel tubes master cylinder again through ratio solenoid directional control valve, the displacement in the descending process of pre-welding machine made of steel tubes master cylinder is checked by the grating scale on pre-welding machine made of steel tubes master cylinder, by PLC, the shift position data signal of grating scale is transferred to analog information to operation screen, displacement in the descending process of operation screen digitlization display pre-welding machine made of steel tubes master cylinder, according to the opening of the adjustment of displacement ratio solenoid directional control valve in the descending process of pre-welding machine made of steel tubes master cylinder, control different oil cylinder and reach the synchronous of oil cylinder, the pressure sensor of pre-welding machine made of steel tubes master cylinder oil-in checks pressure in pre-welding machine made of steel tubes master cylinder, when pressure sensor reaches the force value of operation screen setting to detected pressure value in pre-welding machine made of steel tubes master cylinder, pre-welding machine made of steel tubes master cylinder stops automatically, infrared inspection sensor controls welding gun and carries out automatic welding.
Described master cylinder in-line is epicoele safety valve in parallel and cavity of resorption safety valve respectively, epicoele safety valve and cavity of resorption safety valve are arranged in the hydraulic system of epicoele oil circuit and the control of cavity of resorption oil circuit respectively, and epicoele safety valve and cavity of resorption safety valve control respectively due to card valve in system oil-way and make the oil cylinder working-pressure of control pressure roller exceed the scope of application.
Pre-welding machine made of steel tubes all-the-way tracking system of the present invention first steel pipe pipe is carried out joint close, carries out gas shielded arc welding successively subsequently, carry out pressing operation by the action button in operation screen.In compacting pressure maintaining period, oil flows through proportional pressure valve and carries out Stress control, oil stream controls the stroke of oil cylinder again through ratio solenoid directional control valve, in the descending process of oil cylinder, system changes into data signal analog signal and imports PLC into and control grating scale and check displacement in oil cylinder descending process, and the opening carrying out resize ratio valve reaches the synchronous of oil cylinder to control different oil cylinder.When pressure roller is pressed into steel pipe, system is carried out building pressure pressure and is checked pressure in oil cylinder by sensor, if automatically stopped when reaching the pressure of needs.On soldering tip, infrared ray sensor checks that weld seam carries out automatic welding, the pressure of pressure roller checks the welding pressure of each point in welding process by pressure sensor, the infrared ray sensor while of automatically carrying out at any time adjusting the pressure suppressing steel pipe on soldering tip checks that the change of weld seam adjusts at any time.Weld seam is not had be partially welded, pore, crackle, slag inclusion, to burn and the weld defect of the flaw such as back side overlap.
Control passing ratio overflow valve at hydraulic system pressure to control, oil-feed controls to be connected with ratio solenoid directional control valve, pressure sensor by pipeline, and its oil revolving end is connected with fuel tank.The control port of ratio solenoid directional control valve is connected with rodless cavity with the rod chamber of each pre-welding machine made of steel tubes master cylinder respectively, one group oil cylinder one group ratio solenoid directional control valve and pressure sensor, moment carries out each oil cylinder stroke, the inspection of pressure and other parameters, when the pressure needed when the steel pipe of different size is different with oil cylinder stroke, each parameter of setting is also different, carry out adjustment parameter and weld carrying out welding process when each oil cylinder and pressure carry out pressure and the stroke reaching needs according to the steel pipe of different size, if the pressure that each steel pipe needs due to the difference of distortion when welding and the Stroke Control of oil cylinder do not coexist, pressure and stroke carry out automation adjustment, function screen shows different pressures and the travel parameters of each point in welding testing process.Carry out adjustment automatically when exceeding setup parameter and reach the parameter of setting, reach qualified product.Also for the steel pipe of various different size provides different reference datas, for later quality and be used as parameter foundation.
The whole-process automatic tracking adjustment system of the above-mentioned pre-welding machine made of steel tubes that type of the present invention provides, owing to applying proportional pressure control valve and ratio solenoid directional control valve, pressure sensor, electrical control, the system that solder technology combines, the blind area pressure of proportional pressure control valve can be acted on the initial pressure off-load reduction of master cylinder, the initial pressure of master cylinder is made to be not enough to cause damage to steel plate and mechanical position thereof, thus solve super thick degree in prior art, ultra-thin, extra small, super large-scale difficulty controls the steel pipe of welding quality, solve occur be bent and be forced out vestige or the problem such as occur misalignment when steel-pipe welding moves and cannot weld, dramatically saves on cost human resources, and decrease the percent defective of steel plate, achieve automation greatly, improve production efficiency." pre-welding machine made of steel tubes all-the-way tracking adjustment System ", the control that have employed automation, be characterized in control, change and easy to maintenance, compact conformation, be active in one's movements, working stability is reliable, the welding of the particularly steel-pipe welding aspect of various different size ensure that its quality of welding and control percent defective, also make to reduce under its prerequisite of ensuring the quality of products, the requirement of operator, be design more humane and rationalize, automation.
Accompanying drawing explanation
Fig. 1 is principle of the invention figure;
In figure: 1-power unit; 2-proportional pressure valve; 3-pre-welding machine made of steel tubes master cylinder; 4-pressure sensor; 5-epicoele safety valve; 6-ratio solenoid directional control valve; 7-cavity of resorption safety valve.
Detailed description of the invention
Below in conjunction with accompanying drawing, type of the present invention is further elaborated:
As shown in Figure 1, a kind of pre-welding machine made of steel tubes all-the-way tracking automatic adjustment system, comprise the infrared inspection sensor be connected with pre-welding machine made of steel tubes head, infrared inspection sensor is connected with the image pick-up card of controller.The model of infrared inspection sensor is VDM18-300/20/88/122/151.Infrared inspection sensor is connected with operation screen, and operation screen mainly realizes human-computer exchange information, is transferred in operation screen by PLC, and drive motors followed the tracks of by operation screen joint steel pipe Prewelding machine welding gun; Also comprise welded still pipe compacting pressure-retaining system, wherein welded still pipe compacting pressure-retaining system is comprised and being made up of power unit 1, proportional pressure control valve 2, oil cylinder 3, pressure sensor 4, epicoele safety valve 5, ratio solenoid directional control valve 6, cavity of resorption safety valve 7; Set scale pressure valve 2 on oil cylinder 3 in-line of pre-welding machine made of steel tubes, proportional pressure valve 2 connects ratio solenoid directional control valve 6, ratio solenoid directional control valve 6 attended operation is shielded, ratio solenoid directional control valve 6 is connected with pressure sensor 4, ratio solenoid directional control valve 6 connects proportional pressure valve 2, proportional pressure valve 2 attended operation is shielded, and pressure sensor 4 is arranged on pre-welding machine made of steel tubes master cylinder oil-in.Master cylinder in-line is epicoele safety valve 5 in parallel and cavity of resorption safety valve 7 respectively.
The pressure that the present invention needs according to the steel pipe of different size when the contraction extruding joint close of pressure roller pressure pipe is different, the pressure of system is by power unit 1 build-up pressure, passing ratio pressure valve 2 carries out the Stress control needed again, reach when needing pressure, fluid passing ratio solenoid directional control valve 6 enters pre-welding machine made of steel tubes master cylinder 3 and carries out descending and pressurize, when carrying out pressurize when pressure reaches and needs pressure, pressure sensor 4 carries out pressurize to control apparatus system signal, ensures that pipe joint close is the circular joint close of a wish.Moving up and down of oil cylinder, thus ensure that steel-pipe welding groove reaches welding requirements.Pressure roller realizes the extruding joint close to pipe.In order to the stable pressure roller proportional pressure valve 2 in pressing process of often organizing ensureing pipe joint close carries out adjustment in various degree and makes oil cylinder synchronous, when steel pipe changes specification tune type, recycling hydraulic coupling is unblanked, and it is radial relies on hydraulic coupling locking, ensures joint close quality.The epicoele hydraulic fluid port of pre-welding machine made of steel tubes master cylinder 3 is provided with oil pressure pressure sensor, and pressure sensor is set with pressure tracking value in advance; Pressurize terminates rear pre-welding machine made of steel tubes master cylinder 3 and carries out release, and the pressure of pre-welding machine made of steel tubes master cylinder 3 epicoele carries out off-load through epicoele ratio solenoid directional control valve 6.In order to avoid pre-welding machine made of steel tubes master cylinder 3 at the end of pressurization in stress-relief process because pressure unloads unclean, high pressure is built up at cylinder upper cavity oil in the process of work, therefore ratio solenoid directional control valve 6 in pressure release time carry out valve opening carry out little opening, the opening that the opening of ratio solenoid directional control valve 6 makes the size of root voltage of control ratio solenoid directional control valve 6 in operation screen carry out control ratio solenoid directional control valve 6 makes complete rear pre-welding machine made of steel tubes master cylinder 3 return of pressure oil liquid off-load to top dead-centre.In whole welding process, oil pump control pressure passing ratio pressure valve 2 leads to the pressure looked into of pressure sensor inspection 4 to control the size of its pressure fuel pump, then the pressure sensor of passing ratio solenoid directional control valve 6 controls the pressure size of pressure roller in steel tube surface in the course of work of its pressure roller.After pressure roller compresses steel pipe, operation screen starts welding gun start button, and in welding process, the welding process of welding gun checks welding process and welding quality constantly by image pick-up card, and the parameter area on function screen adjusts welding machine.At the end of welding, operation screen controls platen pressure to operational order to it, makes it carry out control ratio solenoid directional control valve 6 by pressure sensor 4 and makes its pressure release, while pressure roller return.Operation screen operates pre-welding machine made of steel tubes return button and makes its return.
If do not have passing ratio pressure valve 2, ratio solenoid directional control valve 6, pressure sensor 4 to carry out controlled pressure steel pipe just there will be serious misalignment, there will be when there is steel pipe misalignment and directly cause the degradation of steel pipe or scrap.So, by just the change of controlled pressure sternly unfitness of butt joint will can be controlled during pre-welding machine made of steel tubes all-the-way tracking automatic adjustment system prewelding, pressure roller adjustment (the circumferential angle of pressure roller is not right, or with pipe core-wire for axis, left and right pressure roller is asymmetric) not in place.Back side overlap is there will be in welding process, if remove, consuming time, affect usually carrying out of production process; Involve and do not remove, the tracking of weldering welding fabrication and interior welding line in impact.Burn, outside weld quality in impact, need fill up.
The cause producing back side overlap and burn, the pressure adjusting that is in course of adjustment goes wrong joint close tightly, is also likely that hydraulic system pressure is too low; The choice of prewelding workmanship parameter is improper.Must welding current and arc voltage to be equipped with suitable speed of welding, heat input is excessive or weldering speed is too low, all easily produces back side overlap and burn pore.
Claims (6)
1. a pre-welding machine made of steel tubes all-the-way tracking automatic adjustment system, it is characterized in that: comprise the infrared inspection sensor be connected with pre-welding machine made of steel tubes head, described infrared inspection sensor is connected with operation screen, described operation screen mainly realizes human-computer exchange information, described operation screen is connected with PLC, and drive motors followed the tracks of by described operation screen joint steel pipe Prewelding machine welding gun; Also comprise welded still pipe compacting pressure-retaining system, described to welded still pipe compacting pressure-retaining system be included in Set scale pressure valve on pre-welding machine made of steel tubes master cylinder in-line, described proportional pressure valve attended operation screen, described proportional pressure valve connects ratio solenoid directional control valve, described ratio solenoid directional control valve attended operation screen, described ratio solenoid directional control valve is connected with pressure sensor, and described pressure sensor is arranged on the oil-in of the oil cylinder of pre-welding machine made of steel tubes, described pressure sensor and operation screen.
2. pre-welding machine made of steel tubes all-the-way tracking automatic adjustment system according to claim 1, is characterized in that: the model of described infrared inspection sensor is VDM18-300/20/88/122/151.
3. pre-welding machine made of steel tubes all-the-way tracking automatic adjustment system according to claim 1, is characterized in that: described master cylinder in-line is epicoele safety valve in parallel and cavity of resorption safety valve respectively.
4. pre-welding machine made of steel tubes all-the-way tracking automatic adjustment system according to claim 1, is characterized in that: described infrared inspection sensor is connected with the image pick-up card of controller, and the image pick-up card of described controller connects PLC and operation screen.
5. the control method of above-mentioned arbitrary pre-welding machine made of steel tubes all-the-way tracking automatic adjustment system, it is characterized in that: the monitoring of steel pipe seam situation and welding quality treated by described infrared inspection sensor when pre-welding machine made of steel tubes welds, the parameter transmission that infrared inspection sensor detects is to PLC, by PLC, digital given unit signal is converted into pulse signal transmission operation screen again and drive motors is followed the tracks of to pre-welding machine made of steel tubes welding gun, pre-welding machine made of steel tubes welding gun is followed the tracks of drive motors and is moved the motion of welding gun tracking weld seam with Setting signal, and operation screen is Digital Detecting and monitoring welding gun welding position simultaneously, to welded still pipe, pressurize is suppressed to welded still pipe compacting pressure-retaining system simultaneously, the proportional pressure valve that the oil that oil pump is got flows through on pre-welding machine made of steel tubes master cylinder in-line carries out Stress control, oil stream controls the stroke of pre-welding machine made of steel tubes master cylinder again through ratio solenoid directional control valve, in the descending process of pre-welding machine made of steel tubes master cylinder, the displacement in the descending process of pre-welding machine made of steel tubes master cylinder is checked by the grating scale on pre-welding machine made of steel tubes master cylinder, by PLC, the shift position data signal of grating scale is transferred to analog information to operation screen, displacement in the descending process of operation screen digitlization display pre-welding machine made of steel tubes master cylinder, according to the opening of the adjustment of displacement ratio solenoid directional control valve in the descending process of pre-welding machine made of steel tubes master cylinder, control different pre-welding machine made of steel tubes master cylinder and reach the synchronous of oil cylinder, the pressure sensor of pre-welding machine made of steel tubes master cylinder oil-in checks pressure in pre-welding machine made of steel tubes master cylinder, when pressure sensor reaches the force value of operation screen setting to detected pressure value in pre-welding machine made of steel tubes master cylinder, pre-welding machine made of steel tubes master cylinder stops automatically, infrared inspection sensor controls welding gun and carries out automatic welding.
6. the control method of pre-welding machine made of steel tubes all-the-way tracking automatic adjustment system according to claim 5, it is characterized in that: described pre-welding machine made of steel tubes master cylinder in-line is epicoele safety valve in parallel and cavity of resorption safety valve respectively, epicoele safety valve and cavity of resorption safety valve are arranged in the hydraulic system of epicoele oil circuit and the control of cavity of resorption oil circuit respectively, and epicoele safety valve and cavity of resorption safety valve control respectively due to card valve in system oil-way and make the oil cylinder working-pressure of control pressure roller exceed the scope of application.
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| CN201410661869.0A CN104493345B (en) | 2014-11-19 | 2014-11-19 | Pre-welding machine made of steel tubes all-the-way tracking automatic adjustment system and control method thereof |
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| CN201410661869.0A CN104493345B (en) | 2014-11-19 | 2014-11-19 | Pre-welding machine made of steel tubes all-the-way tracking automatic adjustment system and control method thereof |
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| CN2652577Y (en) * | 2003-04-25 | 2004-11-03 | 北京石油化工学院 | Full position walking photoelectric real time tracking pipeline welder robot |
| CN1546268A (en) * | 2003-12-17 | 2004-11-17 | 南昌大学 | Intelligent control system for weld seam tracking and fusion penetration in spiral pipes |
| CN201344171Y (en) * | 2008-12-14 | 2009-11-11 | 天水锻压机床有限公司 | Servo hydraulic system for tracking steel tube |
| JP2013154397A (en) * | 2012-01-05 | 2013-08-15 | Daihen Corp | Welding equipment |
| CN103615436A (en) * | 2013-12-06 | 2014-03-05 | 天水锻压机床(集团)有限公司 | Numerical control electric-hydraulic proportioning system of steel tube straightening machine |
| JP2014184457A (en) * | 2013-03-22 | 2014-10-02 | Daihen Corp | Output control method of welding electric power source |
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2014
- 2014-11-19 CN CN201410661869.0A patent/CN104493345B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2652577Y (en) * | 2003-04-25 | 2004-11-03 | 北京石油化工学院 | Full position walking photoelectric real time tracking pipeline welder robot |
| CN1546268A (en) * | 2003-12-17 | 2004-11-17 | 南昌大学 | Intelligent control system for weld seam tracking and fusion penetration in spiral pipes |
| CN201344171Y (en) * | 2008-12-14 | 2009-11-11 | 天水锻压机床有限公司 | Servo hydraulic system for tracking steel tube |
| JP2013154397A (en) * | 2012-01-05 | 2013-08-15 | Daihen Corp | Welding equipment |
| JP2014184457A (en) * | 2013-03-22 | 2014-10-02 | Daihen Corp | Output control method of welding electric power source |
| CN103615436A (en) * | 2013-12-06 | 2014-03-05 | 天水锻压机床(集团)有限公司 | Numerical control electric-hydraulic proportioning system of steel tube straightening machine |
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