CN103615436B - Steel tube straightening machine numerical control electrohydraulic ratio system - Google Patents
Steel tube straightening machine numerical control electrohydraulic ratio system Download PDFInfo
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Abstract
The steel tube straightening machine numerical control electrohydraulic ratio system of the present invention, including the oil cylinder below top tank and digital control system, replenishing valve it is provided with between top tank and oil cylinder, the rodless cavity of described oil cylinder is connected with digital control system by the first pressure transducer, and the rod chamber of oil cylinder is connected with digital control system by stay-supported encoder；The outfan of digital control system connects electric-hydraulic proportion reversing unit and ratio pressure regulon respectively, system pressure under different operating modes is accurately set up by the numerical control electrohydraulic ratio system adoption rate pressure valve of the present invention, pressure setting and be shown in CNC Panel to be operated；Adopt electro-hydraulic proportion reversing valve that direction and the speed of operating cylinder are carried out accuracy controlling, thus realize master cylinder fast under, fast steadily switching at a slow speed, compacting, release, return, fine motion；Executive component speed, position, pressure can be carried out accurately control, at any time monitoring, regulates at any time；The stable action during switching of speed, pressure, impacts little.
Description
Technical field
The present invention relates to a kind of digital control system, be specifically related to a kind of steel tube straightening machine numerical control electrohydraulic ratio system.
Background technology
At present, the demand of gas pipeline is growing, and the prescription of gas pipeline is also stricter.Numerically controlled steel pipe straightener is the special equipment of conveying oil, gas steel pipes with straight production line indispensability, and its Circular Pipe being mainly used in linearity is not good enough carries out alignment, to improve Circular Pipe linearity, makes up to relevant standard or instructions for use.
Numerically controlled steel pipe straightener is a kind of numerical control electrohydraulic ratio main equipment, plant equipment is made up of the part such as stationary work-table, moving beam and master cylinder, upper and lower straightening mould, rollgang, rotating roller, and each several part of plant equipment is completed corresponding control by corresponding hydraulic system and electrical system.
Existing numerically controlled steel pipe straightener positions 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 that lathe operationally action is unstable, impacting relatively big when speed, pressure transition, positional repeatability is not high.
Summary of the invention
The present invention is directed to problems of the prior art, it is provided that a kind of steel tube straightening machine numerical control electrohydraulic ratio system.
The steel tube straightening machine numerical control electrohydraulic ratio system of the present invention, including top tank and the oil cylinder that communicates therewith below, replenishing valve it is provided with between top tank and oil cylinder, the rodless cavity of this oil cylinder is connected with digital control system by the first pressure transducer, and the rod chamber of oil cylinder is connected with digital control system by stay-supported encoder；The outfan of digital control system connects electric-hydraulic proportion reversing unit and ratio pressure regulon respectively.
Described digital control system is connected to external data input system.
Described electric-hydraulic proportion reversing unit includes the electro-hydraulic proportion reversing valve and the amplification board thereof that are connected with the first Oil pump electrical machinery, and rodless cavity and the rod chamber of oil cylinder are connected with electro-hydraulic proportion reversing valve respectively.
The connection oil circuit of described first Oil pump electrical machinery and electro-hydraulic proportion reversing valve is provided with ratio pressure regulon, its control loop being made up of the first pressure plug-in unit, proportional pressure valve and amplification board thereof, the first pressure cover plate；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 fast switch unit at a slow speed, it direction unit including series connection and throttling unit, the pressure unit in parallel with throttling unit；Described direction unit is the control loop being made up of direction plug-in unit, two-position three way magnetic valve, the first control cover plate；Throttling unit is the control loop being made up 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 made up of the second pressure plug-in unit, the second pressure cover plate；The input of direction plug-in unit is connected with rod chamber, and the outfan of direction plug-in unit is connected with throttling plug-in unit and the second pressure 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 to oil circuit control pressurize unit, and this oil circuit control pressurize unit includes the second Oil pump electrical machinery, the second direct-acting overflow valve, accumulator and the second pressure transducer that are sequentially connected with.
Described second direct-acting overflow valve is connected with replenishing valve.
Oil circuit between described second direct-acting overflow valve and replenishing valve is provided with the second two-position four-way solenoid valve.
Oil circuit between described second Oil pump electrical machinery and the second direct-acting overflow valve is provided with check valve, and the oil circuit of the second Oil pump electrical machinery and check valve is provided with electromagnetic relief valve.
Hinge structure of the present invention has the advantage that
1, system pressure under different operating modes is accurately set up by the numerical control electrohydraulic ratio system adoption rate pressure valve of the present invention, pressure setting and be shown in CNC Panel to be operated；Adopt electro-hydraulic proportion reversing valve that direction and the speed of operating cylinder are carried out accuracy controlling, thus realize master cylinder fast under, fast steadily switching at a slow speed, compacting, release, return, fine motion；Executive component speed, position, pressure can be carried out accurately control, at any time monitoring, regulates at any time；The stable action during switching of speed, pressure, impacts little.
2, the numerical control electrohydraulic ratio system major control oil circuit of the present invention adopts and individually controls, and without impacting off-load, enables the Hydraulic Elements smooth working in system, substantially increases the reliability and stability of system.
3, the present invention numerical control electrohydraulic ratio system fast response time, oil filling capacity is big, liquid flowing resistance is little, system heat generation is little, noise is little, leakage is few.
4, the numerical control electrohydraulic ratio system simple in construction of the present invention, highly sensitive, dependable performance operate steadily.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the fundamental diagram of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the 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 digital control system 2 by the first pressure transducer 3, and the rod chamber 12 of oil cylinder 1 is connected with digital control system 2 by stay-supported encoder 4；The outfan of digital control system 2 connects electric-hydraulic proportion reversing unit 5 and ratio pressure regulon 6 respectively；Digital control system 2 is connected to external data input system 14.
Steel tube straightening machine numerical control electrohydraulic ratio system as shown in Figure 2, including top tank 9 and the oil cylinder 1 that communicates therewith below, is provided with replenishing valve 10 between top tank 9 and oil cylinder 1；Electric-hydraulic proportion reversing unit 5 includes the electro-hydraulic proportion reversing valve 51 and the amplification board thereof that are connected with the first Oil pump electrical machinery 52, and rodless cavity 11 and the rod chamber 12 of oil cylinder 1 are connected with electro-hydraulic proportion reversing valve 51 respectively；First Oil pump electrical machinery 52 and the second Oil pump electrical machinery 81 are connected with lower fuel tank 19 respectively.
The first Oil pump electrical machinery 52 connection oil circuit with electro-hydraulic proportion reversing valve 51 is provided with ratio pressure regulon 6, its control loop being made up 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 fast switch unit 7 at a slow speed, it direction unit 71 including series connection and throttling unit 72, the pressure unit 73 in parallel with throttling unit 72；Direction unit 71 is controlled, by direction plug-in unit 711, two-position three way magnetic valve 712, first, the control loop that cover plate 713 forms；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 controlled, by throttling plug-in unit 721, second, the control loop that cover plate the 722, first two-position four-way solenoid valve 723 forms；Pressure unit 73 is the control loop being made up of second pressure plug-in unit the 731, second pressure cover plate 732；The input of direction plug-in unit 711 is connected with rod chamber 12, and the outfan of direction plug-in unit 711 is connected with throttling plug-in unit 721 and the second pressure plug-in unit 731 respectively；Direction plug-in unit 711 is provided with the first direct-acting overflow valve 714.
Electric-hydraulic proportion reversing unit 5 is connected to oil circuit control pressurize unit 8, and this oil circuit control pressurize unit 8 includes second Oil pump electrical machinery the 81, second direct-acting overflow valve 84, accumulator 82 and the second pressure transducer 83 that are sequentially connected with；Second direct-acting overflow valve 84 is connected with replenishing valve 10；Oil circuit between second direct-acting overflow valve 84 and replenishing valve 10 is provided with the second two-position four-way solenoid valve 13；Oil circuit between second Oil pump electrical machinery 81 and the second direct-acting overflow valve 84 is provided with check valve 85, and the oil circuit of the second Oil pump electrical machinery 81 and check valve 85 is provided with electromagnetic relief valve 86.
First Oil pump electrical machinery 52 is made up of motor, oil pump, provides power for system when different operating mode；Second Oil pump electrical machinery 81 is made up of motor, oil pump, provides power for oil circuit control；Ratio pressure regulon 6, combines from digital control system and can realize realizing different pressure under different requirements, and can be adjusted by monitoring pressure in real time；Oil circuit control pressurize unit 8, provides stable pressure for oil circuit control, so that electro-hydraulic proportion reversing valve 51, replenishing valve 10 property retention are in optimum Working；Electro-hydraulic proportion reversing valve 51, by controlling the input signal of electro-hydraulic proportion reversing valve 51, it may be achieved executive component speed, position are accurately controlled, regulate the impact owing to pressure, velocity jump cause, making lathe accurate positioning, stable action, positional repeatability is high；Fast switch unit 7 at a slow speed, it is achieved descending quick switching at a slow speed；Replenishing valve 7, fast downlink provides the hydraulic oil of big flow.
Specific works process is as follows:
1. under fast
Time under oil cylinder 1 is fast, rod chamber 12 hydraulic oil flows back to lower fuel tank 19 through direction plug-in unit 711, throttling plug-in unit 721, electro-hydraulic proportion reversing valve 51, and owing to oil cylinder rodless cavity 11 oil stream is absent from resistance, oil cylinder 1 is completely by deadweight fast downlink.Oil cylinder rodless cavity 11 is owing to forming vacuum, and replenishing valve 10 self-priming is opened, and a large amount of hydraulic oil enter rodless cavity 11 by replenishing valve 10.Compared with conventional common valve, when the system of common valve composition is under soon, valve core is all turned on, fast lower speed can not regulate, the stability of influential system, and the input signal change that numerical control electrohydraulic ratio system can regulate electro-hydraulic proportion reversing valve 51 descends speed soon, to meet the requirement of lathe, and speed is to be detected by stay-supported encoder 4, the data feedback detected compares with the value set to digital control system 2, inputs signal by adjustment electro-hydraulic proportion reversing valve 51 and reaches setting value accurately.
2. enter work after fast switching at a slow speed to enter
Bumping against under oil cylinder 1 is fast and switch at a slow speed spacing 17 soon, throttling plug-in unit 721 is closed, and cylinder rod chamber 12 hydraulic oil flows back to lower fuel tank 19 through direction plug-in unit the 711, second pressure plug-in unit 731, electro-hydraulic proportion reversing valve 51.The pressure oil that first Oil pump electrical machinery 52 provides enters oil cylinder rodless cavity 11 through electro-hydraulic proportion reversing valve 51, and now replenishing valve 10 resets and cuts out, and hydraulic oil promotes oil cylinder 1 descending, enters work and enters state.
When cutting at a slow speed soon, feeding electro-hydraulic proportion reversing valve 51 input signal cable and reduce, valve core opening tapers into, so that fast, switching action is steady at a slow speed, hydraulic shock is little.
3. pressurize
Mould 15 is suppressed after suffering workpiece, and oil cylinder rodless cavity 11 pressure rises, and 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 reduces due to interior pressure release power, first pressure transducer 3 signal feeds back to digital control system 2, digital control system 2 is through processing to proportional pressure valve 62, electro-hydraulic proportion reversing valve 51 signal, first Oil pump electrical machinery 52 continues, to oil cylinder rodless cavity 11 fuel feeding, to make pressure be maintained at the pressure set by the first pressure transducer 3.
4. release
Native system is to lay down rodless cavity 11 pressure by electro-hydraulic proportion reversing valve 51, certain signal is fed to electro-hydraulic proportion reversing valve 51, electro-hydraulic proportion reversing valve 51 is in right position, at this moment oil cylinder rodless cavity is communicated with lower fuel tank 19 by electro-hydraulic proportion reversing valve 51, rodless cavity 11 pressure is made progressively to be released, it is to avoid to discharge suddenly due to pressure during return and cause 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 reaches the setting pressure of the first pressure transducer 3, after pressurize completes, the first pressure transducer 3 sends signal and performs return action.Position return: detect travel position by stay-supported encoder 4, when the stroke reaching setting, is performed return action, is matched with electro-hydraulic proportion reversing valve 51 by stay-supported encoder 4, and each site error is less 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.The control mouth of replenishing valve 10 is entered owing to accumulator 82 provides certain pressure oil to pass through the second two-position four-way solenoid valve 13, replenishing valve 10 is opened, such rodless cavity 11 hydraulic oil major part flows back to top tank 9 by replenishing valve 10, only sub-fraction flows back to lower fuel tank 19 by electro-hydraulic proportion reversing valve 51, and oil cylinder 1 starts return.
6. accumulator fluid infusion and effect
Accumulator fluid infusion: the pressure of accumulator 82 is to be detected by the second pressure transducer 83, when pressure sets lower limit 8Mpa lower than the second pressure transducer 83, second Oil pump electrical machinery 81 provides hydraulic oil that accumulator 82 is carried out fluid infusion, when fluid infusion makes accumulator 82 pressure reach the second pressure transducer 83 capping 14Mpa, second Oil pump electrical machinery 81 off-load, fluid infusion completes, and makes accumulator 82 keep certain pressure.
Accumulator effect: the control mouth for electro-hydraulic proportion reversing valve 51 provides constant pressure, property retention optimum state when making electro-hydraulic proportion reversing valve 51 work；Power is provided for opening normally closed replenishing valve 10.
Above-mentioned numerically controlled steel pipe straightener electro-hydraulic proportional system provided by the invention, executive component speed, position, pressure, without impacting off-load, can accurately be controlled by the system that can realize, and fast response time, repetitive positioning accuracy, compact conformation, dependable performance operate steadily.
Claims (7)
1. steel tube straightening machine numerical control electrohydraulic ratio system, including top tank (9) and the oil cylinder (1) that communicates therewith below, replenishing valve (10) it is provided with between top tank (9) and oil cylinder (1), it is characterized in that: the rodless cavity (11) of this oil cylinder (1) is connected with electric-hydraulic proportion reversing unit (5), the pipeline connected is provided with the first pressure transducer (3), is connected with digital control system (2) by electric-hydraulic proportion reversing unit (5)；The rod chamber (12) of oil cylinder (1) is connected with fast switch unit (7) at a slow speed, is then connected with electric-hydraulic proportion reversing unit (5)；The straightening mould (15) of oil cylinder (1) is connected with stay-supported encoder (4), and then stay-supported encoder (4) is connected with digital control system (2)；The outfan of digital control system (2) connects electric-hydraulic proportion reversing unit (5) and ratio pressure regulon (6) respectively；nullDescribed electric-hydraulic proportion reversing unit (5) includes the electro-hydraulic proportion reversing valve (51) and the amplification board thereof that are connected with the first Oil pump electrical machinery (52)，The connection oil circuit of the first Oil pump electrical machinery (52) and electro-hydraulic proportion reversing valve (51) is provided with ratio pressure regulon (6)，Ratio pressure regulon (6) is by the first pressure plug-in unit (61)、Proportional pressure valve (62) and amplification board thereof、The control loop that first pressure cover plate (63) forms，The rodless cavity (11) of oil cylinder (1) is connected with electro-hydraulic proportion reversing valve (51)，The rod chamber (12) of oil cylinder (1) is respectively with switch unit (7) and electro-hydraulic proportion reversing valve (51) are sequentially connected at a slow speed soon，First pressure plug-in unit (61) is connected with lower fuel tank (19)，Electro-hydraulic proportion reversing valve (51) is connected with lower fuel tank (19)；Oil circuit between described rod chamber (12) and electro-hydraulic proportion reversing valve (51) is provided with fast switch unit (7) at a slow speed, fast switch unit (7) at a slow speed includes direction unit (71) and the throttling unit (72) of series connection and the pressure unit (73) in parallel with throttling unit (72)；Described direction unit (71) is the control loop being made up of direction plug-in unit (711), two-position three way magnetic valve (712), the first control cover plate (713)；Throttling unit (72) is the control loop being made up 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 made up of the second pressure plug-in unit (731), the second pressure cover plate (732)；The input of direction plug-in unit (711) is connected with rod chamber (12), and the outfan of direction plug-in unit (711) is connected with throttling plug-in unit (721) and the second pressure plug-in unit (731) respectively.
2. steel tube straightening machine numerical control electrohydraulic ratio system as claimed in claim 1, it is characterised in that: described digital control system (2) is connected to external data input system (14).
3. steel tube straightening machine numerical control electrohydraulic ratio system as claimed in claim 1, it is characterised in that: described direction plug-in unit (711) is provided with the first direct-acting overflow valve (714).
4. steel tube straightening machine numerical control electrohydraulic ratio system as claimed in claim 1, it is characterized in that: described electric-hydraulic proportion reversing unit (5) is connected to oil circuit control pressurize unit (8), this oil circuit control pressurize unit (8) includes the second Oil pump electrical machinery (81), the second direct-acting overflow valve (84), accumulator (82) and the second pressure transducer (83) that are sequentially connected with.
5. steel tube straightening machine numerical control electrohydraulic ratio system as claimed in claim 4, it is characterised in that: described second direct-acting overflow valve (84) is connected with replenishing valve (10).
6. the steel tube straightening machine numerical control electrohydraulic ratio system as described in claim 4 or 5, it is characterised in that: the oil circuit between described second direct-acting overflow valve (84) and replenishing valve (10) is provided with the second two-position four-way solenoid valve (13).
7. steel tube straightening machine numerical control electrohydraulic ratio system as claimed in claim 4, it is characterized in that: the oil circuit between described second Oil pump electrical machinery (81) and the second direct-acting overflow valve (84) is provided with the oil circuit of check valve (85), the second Oil pump electrical machinery (81) and check valve (85) and is provided with electromagnetic relief valve (86).
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| CN114001069B (en) * | 2021-11-12 | 2024-06-04 | 中天钢铁集团有限公司 | Hydraulic system of straightener 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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