CN103615436A - Numerical control electric-hydraulic proportioning system of steel tube straightening machine - Google Patents
Numerical control electric-hydraulic proportioning system of steel tube straightening machine Download PDFInfo
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- CN103615436A CN103615436A CN201310649669.9A CN201310649669A CN103615436A CN 103615436 A CN103615436 A CN 103615436A CN 201310649669 A CN201310649669 A CN 201310649669A CN 103615436 A CN103615436 A CN 103615436A
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Abstract
The invention provides a numerical control electric-hydraulic proportioning system of a steel tube straightening machine. The numerical control electric-hydraulic proportioning system comprises an oil cylinder under an upper oil tank and a numerical control system, wherein a filling valve is arranged between the upper oil tank and the oil cylinder, a rodless cavity of the oil cylinder is connected with the numerical control system through a first pressure sensor, and a rod cavity of the oil cylinder is connected with the numerical control system through a stay wire type encoder. The output end of the numerical control system is respectively connected with an electric-hydraulic proportion reversing unit and a proportion pressure adjusting unit. The numerical control electric-hydraulic proportioning system adopts a proportional pressure valve to accurately regulate pressures in different working conditions, and pressure setting and displaying are operated on a numerical control panel. The direction and the speed of the working oil cylinder are accurately regulated by using an electric-hydraulic proportion reversing valve, accordingly quick descending, stable switching at the high or low speed, pressing, pressure relief, return and final moving of a main cylinder are achieved. The speed, the position and the pressure of an execution element can be accurately controlled, monitored and regulated at any time. Speed and pressure switching actions are stable, and the impact is small.
Description
Technical field
The present invention relates to a kind of numerical control system, be specifically related to a kind of steel tube straightening machine numerical control electrohydraulic ratio system.
Background technique
At present, the demand of gas pipeline is growing, and the quality requirement of gas pipeline is also stricter.Numerically controlled steel pipe straightener is the special device of transferring oil, gas steel pipes with straight production line indispensability, and it is mainly used in the not good enough Circular Pipe of straightness accuracy to carry out alignment, to improve Circular Pipe straightness accuracy, makes it to reach related standards or usage requirement.
Numerically controlled steel pipe straightener is a kind of numerical control electrohydraulic ratio main equipment, machinery is partly comprised of stationary work-table, moving beam and master cylinder, upper and lower straightening mould, rollgang, rotating roller etc., and the each several part of machinery completes corresponding control by corresponding hydraulic system and electrical system.
Existing numerically controlled steel pipe straightener is located inaccuracy when alignment steel pipe, the control accuracy of speed is not high, and during alignment different size steel pipe, pressure controling precision is not high yet, causes lathe action when work not steady, when speed, pressure transition, impact greatlyr, positional repeatability is not high.
Summary of the invention
The present invention is directed to problems of the prior art, a kind of steel tube straightening machine numerical control electrohydraulic ratio system is provided.
Steel tube straightening machine numerical control electrohydraulic ratio system of the present invention, comprise the oil cylinder that top tank and below thereof are communicated with it, between top tank and oil cylinder, be provided with liquid-filling valve, the rodless cavity of this oil cylinder is connected with numerical control system by the first pressure transducer, and the rod chamber of oil cylinder is connected with numerical control system by boom guy type encoder; The output terminal of numerical control system connects respectively electric-hydraulic proportion reversing unit and ratio pressure regulon.
Described numerical control system is connected with external data input system.
Described electric-hydraulic proportion reversing unit comprises electro-hydraulic proportion reversing valve and the amplification board thereof being connected with the first Oil pump electrical machinery, and the rodless cavity of oil cylinder is connected with electro-hydraulic proportion reversing valve respectively with rod chamber.
In being connected of described the first Oil pump electrical machinery and electro-hydraulic proportion reversing valve, on oil circuit, be provided with ratio pressure regulon, the control loop that it is comprised of the first pressure plug-in unit, proportional pressure valve and amplification board thereof, the first pressure cover plate; The first pressure plug-in unit is connected with lower fuel tank, and electro-hydraulic proportion reversing valve is connected with lower fuel tank.
Oil circuit between described rod chamber and electro-hydraulic proportion reversing valve is provided with soon switching unit at a slow speed, and it comprises direction unit and the throttling unit of series connection, the pressure unit in parallel with throttling unit; Described direction unit is to control by direction plug-in unit, two-position three way magnetic valve, first control loop that cover plate forms; Throttling unit is the control loop being comprised of throttling plug-in unit, the second control cover plate, the first two-position four-way solenoid valve; Pressure unit is the control loop being comprised of the second pressure plug-in unit, the second pressure cover plate; The input end of direction plug-in unit is connected with rod chamber, and the output terminal of direction plug-in unit is connected with the second pressure plug-in unit with throttling plug-in unit respectively.
Described direction plug-in unit is provided with the first direct-acting overflow valve.
Described electric-hydraulic proportion reversing unit is connected with oil circuit control pressurize unit, and this oil circuit control pressurize unit comprises the second Oil pump electrical machinery, the second direct-acting overflow valve, accumulator and the second pressure transducer connecting successively.
Described the second direct-acting overflow valve is connected with liquid-filling valve.
Oil circuit between described the second direct-acting overflow valve and liquid-filling valve is provided with the second two-position four-way solenoid valve.
Oil circuit between described the second Oil pump electrical machinery and the second direct-acting overflow valve is provided with one-way valve, and the oil circuit of the second Oil pump electrical machinery and one-way valve is provided with electromagnetic relief valve.
The present invention is relative, and prior art has the following advantages:
1, numerical control electrohydraulic ratio system adoption rate pressure valve of the present invention to system the pressure under different operating modes accurately set up, pressure setting and be presented at the enterprising line operate of CNC Panel; Adopt electro-hydraulic proportion reversing valve to carry out accuracy controlling to the direction of operating cylinder and speed, thereby realize under master cylinder fast, steadily switch at a slow speed soon, compacting, release, return, fine motion; Can accurately control executive component speed, position, pressure, monitor at any time, regulate at any time; Stable action when speed, pressure switch, impacts little.
2, numerical control electrohydraulic ratio system major control oil circuit of the present invention adopts separately and controls, and without impacting off-load, makes the hydraulic element in system can smooth working, has greatly improved the reliability and stability of system.
3, numerical control electrohydraulic ratio system fast response time of the present invention, oil filling capacity is large, liquid flowing resistance is little, system heating is little, noise is little, leakage is few.
4, simple in structure, highly sensitive, the reliable performance of numerical control electrohydraulic ratio system of the present invention operates steadily.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is fundamental diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, steel tube straightening machine numerical control electrohydraulic ratio system of the present invention is described in further detail.
Steel tube straightening machine numerical control electrohydraulic ratio system as shown in Figure 1, the rodless cavity 11 of oil cylinder 1 is connected with numerical control system 2 by the first pressure transducer 3, and the rod chamber 12 of oil cylinder 1 is connected with numerical control system 2 by boom guy type encoder 4; The output terminal of numerical control system 2 connects respectively electric-hydraulic proportion reversing unit 5 and ratio pressure regulon 6; Numerical control system 2 is connected with external data input system 14.
Steel tube straightening machine numerical control electrohydraulic ratio system as shown in Figure 2, comprises the oil cylinder 1 that top tank 9 and below thereof are communicated with it, between top tank 9 and oil cylinder 1, is provided with liquid-filling valve 10; Electric-hydraulic proportion reversing unit 5 comprises electro-hydraulic proportion reversing valve 51 and the amplification board thereof being connected with the first Oil pump electrical machinery 52, and the rodless cavity 11 of oil cylinder 1 is connected with electro-hydraulic proportion reversing valve 51 respectively with rod chamber 12; The first Oil pump electrical machinery 52 is connected with lower fuel tank 19 respectively with the second Oil pump electrical machinery 81.
In being connected of the first Oil pump electrical machinery 52 and electro-hydraulic proportion reversing valve 51, on oil circuit, be provided with ratio pressure regulon 6, the control loop that it is comprised of the first pressure plug-in unit 61, proportional pressure valve 62 and amplification board thereof, the first pressure cover plate 63; Oil circuit between rod chamber 12 and electro-hydraulic proportion reversing valve 51 is provided with soon switching unit 7 at a slow speed, and it comprises direction unit 71 and the throttling unit 72 of series connection, the pressure unit 73 in parallel with throttling unit 72; Direction unit 71 is to control by direction plug-in unit 711, two-position three way magnetic valve 712, first control loop that cover plate 713 forms; The first pressure plug-in unit 61 is connected with lower fuel tank 19, and electro-hydraulic proportion reversing valve 51 is connected with lower fuel tank 19; Throttling unit 72 is the control loop being comprised of throttling plug-in unit 721, the second control cover plate 722, the first two-position four-way solenoid valve 723; Pressure unit 73 is the control loop being comprised of the second pressure plug-in unit 731, the second pressure cover plate 732; The input end of direction plug-in unit 711 is connected with rod chamber 12, and the output terminal of direction plug-in unit 711 is connected with the second pressure plug-in unit 731 with throttling plug-in unit 721 respectively; Direction plug-in unit 711 is provided with the first direct-acting overflow valve 714.
Electric-hydraulic proportion reversing unit 5 is connected with oil circuit control pressurize unit 8, and this oil circuit control pressurize unit 8 comprises the second Oil pump electrical machinery 81, the second direct-acting overflow valve 84, accumulator 82 and the second pressure transducer 83 connecting successively; The second direct-acting overflow valve 84 is connected with liquid-filling valve 10; Oil circuit between the second direct-acting overflow valve 84 and liquid-filling valve 10 is provided with the second two-position four-way solenoid valve 13; Oil circuit between the second Oil pump electrical machinery 81 and the second direct-acting overflow valve 84 is provided with one-way valve 85, the second Oil pump electrical machineries 81 and is provided with electromagnetic relief valve 86 with the oil circuit of one-way valve 85.
The first Oil pump electrical machinery 52 is comprised of motor, oil pump, for system provides power when the different operating mode; The second Oil pump electrical machinery 81 is comprised of motor, oil pump, for oil circuit control provides power; Ratio pressure regulon 6 is realized different pressure from numerical control system in conjunction with realizing under different requirements, and can adjust by monitoring pressure in real time; Oil circuit control pressurize unit 8, for oil circuit control provides stable pressure, thereby makes electro-hydraulic proportion reversing valve 51, liquid-filling valve 10 property retentions in optimum Working; Electro-hydraulic proportion reversing valve 51, by the input signal of electro-hydraulic proportion reversing valve 51 is controlled, can realize executive component speed, position are accurately controlled, the impact that adjusting causes due to pressure, velocity jump, make lathe accurate positioning, stable action, positional repeatability is high; Switching unit 7 at a slow speed soon, realizes descending switching at a slow speed fast; Liquid-filling valve 7, the fast descending hydraulic oil that large flow is provided.
Specific works process is as follows:
1. under fast
Oil cylinder 1 rod chamber of fast lower time 12 hydraulic oil flow back to lower fuel tank 19 through direction plug-in unit 711, throttling plug-in unit 721, electro-hydraulic proportion reversing valve 51, and because oil cylinder rodless cavity 11 oil streams do not exist resistance, oil cylinder 1 is completely descending fast by deadweight.Oil cylinder rodless cavity 11 is owing to forming vacuum, and liquid-filling valve 10 self-primings are opened, and a large amount of hydraulic oil enters rodless cavity 11 by liquid-filling valve 10.Compare with common valve in the past, the system that common valve forms fast lower time valve core all open, fast lower speed can not regulate, affect the stability of system, and numerical control electrohydraulic ratio system can regulate the input signal of electro-hydraulic proportion reversing valve 51 to change fast lower speed, to meet the requirement of lathe, and speed is to detect by boom guy type encoder 4, the data feedback detecting compares to numerical control system 2 and the value of setting, by regulating electro-hydraulic proportion reversing valve 51 input signals to reach accurately setting value.
2. after switching at a slow speed soon, entering work enters
Under oil cylinder 1 is fast, bump against and switch at a slow speed soon spacingly 17, throttling plug-in unit 721 is closed, and cylinder rod chamber 12 hydraulic oil flow back to lower fuel tank 19 through direction plug-in units 711, the second pressure plug-in unit 731, electro-hydraulic proportion reversing valve 51.The pressure oil that the first Oil pump electrical machinery 52 provides enters oil cylinder rodless cavity 11 through electro-hydraulic proportion reversing valve 51, and now liquid-filling valve 10 resets and cuts out, and it is descending that hydraulic oil promotes oil cylinder 1, enters work and enter state.
While cutting at a slow speed soon, feed electro-hydraulic proportion reversing valve 51 input signal linearities and reduce, valve core opening diminishes gradually so that switch stable action at a slow speed soon, hydraulic shock is little.
3. pressurize
Mould 15 suffers after workpiece, suppresses, and oil cylinder rodless cavity 11 pressure rises, when pressure reaches the setting value of the first pressure transducer 3, proportional pressure valve 62, electro-hydraulic proportion reversing valve 51 power-off, system starts pressurize.In pressure maintaining period, if rodless cavity 11 pressure are due to the interior pressure decreased of letting out, the first pressure transducer 3 signal feed back to numerical control system 2, numerical control system 2 is through processing to proportional pressure valve 62, electro-hydraulic proportion reversing valve 51 signals, the first Oil pump electrical machinery 52 continues to oil cylinder rodless cavity 11 fuel feeding, makes pressure remain on the pressure that the first pressure transducer 3 sets.
4. release
Native system is to lay down rodless cavity 11 pressure by electro-hydraulic proportion reversing valve 51, feed certain signal to electro-hydraulic proportion reversing valve 51, electro-hydraulic proportion reversing valve 51 is in right position, at this moment oil cylinder rodless cavity communicates with lower fuel tank 19 by electro-hydraulic proportion reversing valve 51, rodless cavity 11 pressure are progressively discharged, while avoiding return because pressure sudden outburst causes hydraulic shock.
5. return
Straightener has two kinds of return modes: one is pressure return; Two is position return.Pressure return: press steel pipe and start pressurize when rodless cavity 11 pressure reach the setting pressure of the first pressure transducer 3, after pressurize completes, the first pressure transducer 3 sends signal and carries out return action.Position return: detect travel position by boom guy type encoder 4, when reaching the stroke of setting, carry out return action, match with electro-hydraulic proportion reversing valve 51 by boom guy type encoder 4, each positional error is no more than 0.05mm.
After release completes, the pressure oil that the first Oil pump electrical machinery 52 provides enters cylinder rod chamber 12 by electro-hydraulic proportion reversing valve 51, throttling plug-in unit 721, direction plug-in unit 711.Because providing certain pressure oil, accumulator 82 by the second two-position four-way solenoid valve 13, enters the control mouth of liquid-filling valve 10, liquid-filling valve 10 is opened, rodless cavity 11 hydraulic oil major parts flow back to top tank 9 by liquid-filling valve 10 like this, only have sub-fraction to flow back to lower fuel tank 19 by electro-hydraulic proportion reversing valve 51, oil cylinder 1 starts return.
6. accumulator fluid infusion and effect
Accumulator fluid infusion: the pressure of accumulator 82 is to detect by the second pressure transducer 83, when pressure is set lower limit 8Mpa lower than the second pressure transducer 83, the second Oil pump electrical machinery 81 provides high pressure oil to carry out fluid infusion to accumulator 82, when making accumulator 82 pressure, fluid infusion reaches the second pressure transducer 83 capping 14Mpa, the second Oil pump electrical machinery 81 off-loads, fluid infusion completes, and makes accumulator 82 keep certain pressure.
Accumulator effect: for the control mouth of electro-hydraulic proportion reversing valve 51 provides constant pressure, property retention the optimum state while making electro-hydraulic proportion reversing valve 51 work; For opening normally closed liquid-filling valve 10, provide power.
Above-mentioned numerically controlled steel pipe straightener electro-hydraulic proportional system provided by the invention, the system that can realize, without impacting off-load, can accurately be controlled executive component speed, position, pressure, and fast response time, repetitive positioning accuracy, compact structure, reliable performance operate steadily.
Claims (10)
1. steel tube straightening machine numerical control electrohydraulic ratio system, comprise the oil cylinder (1) that top tank (9) and below thereof are communicated with it, between top tank (9) and oil cylinder (1), be provided with liquid-filling valve (10), it is characterized in that: the rodless cavity (11) of this oil cylinder (1) is connected with numerical control system (2) by the first pressure transducer (3), the rod chamber (12) of oil cylinder (1) is connected with numerical control system (2) by boom guy type encoder (4); The output terminal of numerical control system (2) connects respectively electric-hydraulic proportion reversing unit (5) and ratio pressure regulon (6).
2. steel tube straightening machine numerical control electrohydraulic ratio system as claimed in claim 1, is characterized in that: described numerical control system (2) is connected with external data input system (14).
3. steel tube straightening machine numerical control electrohydraulic ratio system as claimed in claim 1 or 2, it is characterized in that: described electric-hydraulic proportion reversing unit (5) comprises electro-hydraulic proportion reversing valve (51) and the amplification board thereof being connected with the first Oil pump electrical machinery (52), the rodless cavity (11) of oil cylinder (1) is connected with electro-hydraulic proportion reversing valve (51) respectively with rod chamber (12).
4. steel tube straightening machine numerical control electrohydraulic ratio system as claimed in claim 3, it is characterized in that: in being connected of described the first Oil pump electrical machinery (52) and electro-hydraulic proportion reversing valve (51), on oil circuit, be provided with ratio pressure regulon (6), the control loop that it is comprised of the first pressure plug-in unit (61), proportional pressure valve (62) and amplification board thereof, the first pressure cover plate (63); The first pressure plug-in unit (61) is connected with lower fuel tank (19), and electro-hydraulic proportion reversing valve (51) is connected with lower fuel tank (19).
5. steel tube straightening machine numerical control electrohydraulic ratio system as claimed in claim 4, it is characterized in that: the oil circuit between described rod chamber (12) and electro-hydraulic proportion reversing valve (51) is provided with soon switching unit (7) at a slow speed, it comprises direction unit (71) and throttling unit (72) of series connection, the pressure unit (73) in parallel with throttling unit (72); Described direction unit (71) is to control by direction plug-in unit (711), two-position three way magnetic valve (712), first control loop that cover plate (713) forms; Throttling unit (72) is the control loop being comprised of throttling plug-in unit (721), the second control cover plate (722), the first two-position four-way solenoid valve (723); Pressure unit (73) is the control loop being comprised of the second pressure plug-in unit (731), the second pressure cover plate (732); The input end of direction plug-in unit (711) is connected with rod chamber (12), and the output terminal of direction plug-in unit (711) is connected with the second pressure plug-in unit (731) with throttling plug-in unit (721) respectively.
6. steel tube straightening machine numerical control electrohydraulic ratio system as claimed in claim 5, is characterized in that: described direction plug-in unit (711) is provided with the first direct-acting overflow valve (714).
7. the steel tube straightening machine numerical control electrohydraulic ratio system as described in claim 5 or 6, it is characterized in that: described electric-hydraulic proportion reversing unit (5) is connected with oil circuit control pressurize unit (8), this oil circuit control pressurize unit (8) comprises the second Oil pump electrical machinery (81), the second direct-acting overflow valve (84), accumulator (82) and the second pressure transducer (83) connecting successively.
8. steel tube straightening machine numerical control electrohydraulic ratio system as claimed in claim 7, is characterized in that: described the second direct-acting overflow valve (84) is connected with liquid-filling valve (10).
9. steel tube straightening machine numerical control electrohydraulic ratio system as claimed in claim 8, is characterized in that: the oil circuit between described the second direct-acting overflow valve (84) and liquid-filling valve (10) is provided with the second two-position four-way solenoid valve (13).
10. steel tube straightening machine numerical control electrohydraulic ratio system as claimed in claim 9, it is characterized in that: the oil circuit between described the second Oil pump electrical machinery (81) and the second direct-acting overflow valve (84) is provided with one-way valve (85), the second Oil pump electrical machinery (81) is provided with electromagnetic relief valve (86) with the oil circuit of one-way valve (85).
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| CN104154053A (en) * | 2014-07-18 | 2014-11-19 | 国家电网公司 | Main-cylinder hydraulic loop system |
| CN104493345A (en) * | 2014-11-19 | 2015-04-08 | 天水锻压机床(集团)有限公司 | Whole-process tracing automatic adjusting system for steel pipe pre-welding machine and control method of whole-process tracing automatic adjusting system |
| CN105156372A (en) * | 2015-10-22 | 2015-12-16 | 太原科技大学 | Pump-valve compound control hydraulic system for full-hydraulic straightener |
| CN105697471A (en) * | 2014-07-18 | 2016-06-22 | 江苏省电力公司南通供电公司 | Control method of electro-hydraulic proportional loop system with good working effect |
| CN105715629A (en) * | 2014-07-18 | 2016-06-29 | 江苏省电力公司南通供电公司 | Control method for electric-hydraulic proportional loop system reasonable in structure |
| CN105782139A (en) * | 2014-07-18 | 2016-07-20 | 江苏省电力公司南通供电公司 | Electric-hydraulic proportional loop system capable of effectively improving pressing performance |
| CN106438585A (en) * | 2016-12-09 | 2017-02-22 | 山东大学 | Control system with buffering hydraulic cylinder and control method |
| CN108020269A (en) * | 2018-01-30 | 2018-05-11 | 吉林大学 | A kind of acoustic emission test device detected for axial workpiece bending crack with fracture |
| CN114001069A (en) * | 2021-11-12 | 2022-02-01 | 中天钢铁集团有限公司 | Hydraulic system of straightening machine and operation method thereof |
| CN114198348A (en) * | 2021-12-16 | 2022-03-18 | 天水锻压机床(集团)有限公司 | Hydraulic system of super-tonnage servo pump-controlled bending machine and control method thereof |
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| CN105782139A (en) * | 2014-07-18 | 2016-07-20 | 江苏省电力公司南通供电公司 | Electric-hydraulic proportional loop system capable of effectively improving pressing performance |
| CN105697473A (en) * | 2014-07-18 | 2016-06-22 | 江苏省电力公司南通供电公司 | Electro-hydraulic proportional loop system with reasonable structure |
| CN105805061A (en) * | 2014-07-18 | 2016-07-27 | 江苏省电力公司南通供电公司 | Control method of electro-hydraulic proportion loop system with reasonable structure |
| CN105697471A (en) * | 2014-07-18 | 2016-06-22 | 江苏省电力公司南通供电公司 | Control method of electro-hydraulic proportional loop system with good working effect |
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| CN105715629A (en) * | 2014-07-18 | 2016-06-29 | 江苏省电力公司南通供电公司 | Control method for electric-hydraulic proportional loop system reasonable in structure |
| CN104493345A (en) * | 2014-11-19 | 2015-04-08 | 天水锻压机床(集团)有限公司 | Whole-process tracing automatic adjusting system for steel pipe pre-welding machine and control method of whole-process tracing automatic adjusting system |
| CN105156372A (en) * | 2015-10-22 | 2015-12-16 | 太原科技大学 | Pump-valve compound control hydraulic system for full-hydraulic straightener |
| CN106438585A (en) * | 2016-12-09 | 2017-02-22 | 山东大学 | Control system with buffering hydraulic cylinder and control method |
| CN106438585B (en) * | 2016-12-09 | 2018-01-05 | 山东大学 | Control system and control method with pooling feature hydraulic cylinder |
| CN108020269A (en) * | 2018-01-30 | 2018-05-11 | 吉林大学 | A kind of acoustic emission test device detected for axial workpiece bending crack with fracture |
| CN108020269B (en) * | 2018-01-30 | 2023-09-29 | 吉林大学 | Acoustic emission testing device for detecting bending cracks and fractures of shaft parts |
| CN114001069A (en) * | 2021-11-12 | 2022-02-01 | 中天钢铁集团有限公司 | Hydraulic system of straightening machine and operation method thereof |
| CN114198348A (en) * | 2021-12-16 | 2022-03-18 | 天水锻压机床(集团)有限公司 | Hydraulic system of super-tonnage servo pump-controlled bending machine and control method thereof |
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