CN102513413A - Hydraulic control system for novel servo pump control bending machine - Google Patents
Hydraulic control system for novel servo pump control bending machine Download PDFInfo
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- CN102513413A CN102513413A CN2011103953867A CN201110395386A CN102513413A CN 102513413 A CN102513413 A CN 102513413A CN 2011103953867 A CN2011103953867 A CN 2011103953867A CN 201110395386 A CN201110395386 A CN 201110395386A CN 102513413 A CN102513413 A CN 102513413A
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Abstract
The invention belongs to the technical field of hydraulic control and particularly relates to a hydraulic control system of a novel bending machine, i.e. a servo pump control system. The hydraulic control system comprises a motive power source and a control valve group, wherein the motive power source is connected with a numerical control system. The hydraulic control system is characterized in that the motive power source comprises a servo motor, a bidirectional quantitative pump and an oil tank, the bidirectional quantitative pump and the oil tank are connected with the servo motor, the control valve group comprises a shuttle valve, a pressure valve, an unloading valve, a one-way valve, a reversing valve, a back pressure valve, a poppet valve, a safety valve and a liquid filling valve, the pressure valve is used for regulating the system pressure, an oil inlet and outlet of the bidirectional quantitative pump is controlled by the shuttle valve, a positive oil outlet is directly connected with an upper cavity of an oil cylinder, a reverse oil outlet is connected with a lower cavity of the oil cylinder through the poppet valve and the back pressure valve, an oil inlet and outlet of the bidirectional quantitative pump is connected with the oil tank through the one-way valve, the reversing valve and the liquid filling valve, the liquid charging valve is connected with the control valve, and the safety valve is connected between the oil tank and the lower cavity of the oil cylinder. The hydraulic control system has the characteristics that efficiency is high, the energy is saved, and the synchronous precision is high.
Description
Technical field
The invention belongs to technical field of hydraulic, be specifically related to a kind of novel bender hydraulic control system, promptly a kind of servo pump control system.
Background technology
Numerical control bender is mainly used in sheet metal processing, can reduce operation easier according to angle automatic computing engine tool position, increases work efficiency.The main side valve type hydraulic control system equipment that adopts the development fifties in the numerical control bender system, its guiding valve hydraulic control system performance parameter is low, when running into bigger offset loading force in the bender impulse stroke; Can produce bigger unbalance loading moment to equipment, can not guarantee the displacement accuracy of oil cylinder, main frame mechanism is deformed; Cause the bender precision low, while control section complex structure, fault rate is high; Leak seriously, action is unstable, impacts big; Fast speed is unadjustable down, and it is bigger to take up room, and maintenance is inconvenient.
At present, the hydraulic control system principle of domestic electro-hydraulic servo Synchronous Bending machine is similar, and do not become decades basically, is valve control system, adopts the throttle grverning principle, and energy loss is big, and system is prone to heating, and efficient is low.
Along with the development of World Economics, " saving energy and reduce the cost " puts on agenda, and hydraulic technique also develops to energy-efficient direction, for this reason, presses for development of new pump control bender hydraulic system.
Summary of the invention
The objective of the invention is to present situation, aim at a kind of novel servopump control bender hydraulic control system that servopump control electricity liquid Synchronous Bending machine system is proposed.
System of the present invention adopts servomotor to add the volumetric speed control principle of two-way constant displacement pump, utilizes the servomotor speed change, changes the output flow of pump, to adapt to the requirement of the various operating mode speed of load, has reduced spill losses greatly, improves system effectiveness greatly.Simultaneously, adopt two-way constant displacement pump, utilize the rotating of servomotor; Change the fluid flow direction of pump, directly the direction of motion of control load has substituted original proportional servo valve; Reduce the drag losses and the leakage loss of reversal valve, further cut down the consumption of energy, saved cost.Along with the development of hydraulic technique to energy-efficient direction, the present invention controls system can replace former valve control system.
Main technical schemes of the present invention: novel servopump control bender hydraulic control system, comprise the power source, the control valve group that are connected with digital control system, it is characterized in that power source comprises servomotor and the two-way constant displacement pump, the fuel tank that are connected with servomotor; The control valve group comprises pressure valve, the unloader of shuttle valve and regulating system pressure, also comprises check valve, reversal valve, counterbalance valve, poppet valve, safety valve and prefill valve; The oil inlet and outlet of two-way constant displacement pump is controlled through shuttle valve, and the forward oil-out directly connects the oil cylinder epicoele, and reverse oil-out connects the oil cylinder cavity of resorption through poppet valve, counterbalance valve; The oil inlet and outlet of two-way constant displacement pump is through check valve, reversal valve, prefill valve connected tank; Prefill valve connects control valve; Be connected with safety valve between fuel tank and the oil cylinder cavity of resorption.
Usually, have Chang Kai or normally closed mode control valve and all be applicable to prefill valve control of the present invention.
The closed loop synchronous control system of system employs volumetric speed control hydraulic principle of the present invention; Rely on the servomotor rotating to control two-way constant displacement pump and make the flow switching-over; And carry out speed regulation through the flow that the rotating speed that changes servomotor changes pump; Omit proportional servo valve, reduced drag losses and pressure leakage loss and system's spill losses of reversal valve.Through the rotating speed of servomotor control pump, make its no-load power consumption minimum during this system dry run.When servomotor started, pump approaches not have pressure did not have the flow startup, and starting power is minimum.At packing stage, when system pressure reached setting pressure, two-way constant displacement pump almost can stall, and overflow valve does not almost have the fluid overflow.Because the output flow of pump adapts to the requirement of various bending operating modes, greatly degree has reduced loss.Thereby saved quantity, the caloric value of control valve, had energy-efficient characteristics, than original valve control system energy-conservation 1/3; Precise rotation control through servomotor produces higher synchronous precision and response fast.
Description of drawings
Accompanying drawing 1 is embodiment of the invention control system syndeton sketch map.
Among the figure, 25-prefill valve; 30-control valve; 40-reversal valve; 50-unloader; 60-check valve; 80-shuttle valve; 90-pressure valve; 100-dorsad valves; 110-safety valve; 120-poppet valve; 130,140-liquid resistance; A-oil cylinder rodless cavity; B-cylinder rod chamber; X1-oil pump forward oil-out; The reverse oil-out of X2-oil pump; MX1-X1 pressure taps; MX2-X2 pressure taps; MX3-X3 pressure taps; M2.1-cylinder rod chamber pressure taps; T---oil return opening; The electromagnet of Y1-poppet valve; The electromagnet of Y2-reversal valve; The electromagnet of Y3-unloader.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described in detail.
Embodiment: present embodiment control system syndeton mainly comprises the power source, the control valve group that are connected with digital control system shown in accompanying drawing 1, and its main feature is that power source comprises servomotor and the two-way constant displacement pump, the fuel tank that are connected with servomotor; The control valve group comprises pressure valve (90), the unloader (50) that is used for regulating system pressure, also comprises shuttle valve (80), check valve (60), reversal valve (40), counterbalance valve (100), poppet valve (120), safety valve (110) and prefill valve (25).
In the present embodiment; The oil inlet and outlet of two-way constant displacement pump is controlled through shuttle valve (80); Oil pump forward oil-out X1 directly connects oil cylinder epicoele (being oil cylinder rodless cavity A), and the reverse oil-out X2 of oil pump connects oil cylinder cavity of resorption (being cylinder rod chamber B) through poppet valve (120), counterbalance valve (100); The oil inlet and outlet of two-way constant displacement pump is through check valve (60), reversal valve (40), prefill valve (25) connected tank; Prefill valve (25) connection has Chang Kai or normally closed mode control valve (30); Be connected with safety valve (110) between fuel tank and the oil cylinder cavity of resorption.Liquid resistance (130) blocked when prefill valve (25) was the SFE type, and liquid resistance (140) blocked when prefill valve (25) was the PV type.
Present embodiment operates like this, and sequence of movement is as shown in the table
One, pressure control: start Oil pump electrical machinery,, select control, realize bidirection press output through the pressure of shuttle valve (80) according to the difference of working stage; The pressure of pressure valve (90) regulator solution pressing system is to satisfy the requirement of bending power.
Two, operation cycle
1, down fast: digital control system is instructed to servomotor; Servomotor drives two-way constant displacement pump speed change just to be changeed, oil pump output fluid, and fluid gets into the oil cylinder epicoele; One the tunnel through shuttle valve (80), check valve (60), reversal valve (40); Prefill valve (25) is opened, and fuel tank fluid gets into the oil cylinder epicoele from prefill valve, and oil cylinder is downward fast.Oil cylinder cavity of resorption fluid is through the oil sucting cavity of poppet valve (120) inflow pump.Slide block descends speed to obtain friction speed through the rotating speed speed that digital control system is controlled servomotor soon.
2, the worker advances: digital control system is instructed to servomotor, and servomotor drives two-way constant displacement pump speed change just to be changeed, and oil pump output fluid gets into the oil cylinder epicoele, and oil cylinder downward worker advance, and oil cylinder cavity of resorption fluid is through the oil sucting cavity of counterbalance valve (100) inflow pump.Safety valve (110) is to prevent oil cylinder cavity of resorption hypertonia, and setting pressure is higher by 10% than system pressure; Counterbalance valve (100) setting pressure is generally equalizing pressure and adds (30～50) bar.The slide block work speed can obtain friction speed through the rotating speed speed that digital control system is controlled servomotor.
3, pressurize: digital control system is instructed to servomotor, and servomotor drives two-way constant displacement pump speed change and stops operating, thereby cuts off the path in the upper and lower chamber of oil cylinder, and slide block rests on bottom dead centre and carries out pressurize.
4, off-load: digital control system is instructed to servomotor; Servomotor drives two-way constant displacement pump speed change counter-rotating, and oil pump output oil gets into the oil cylinder cavity of resorption, and slide block is slowly up; Top Runby can be adjusted through regulating the digital control system parameter; The used time of off-load process is set by the decompression rate parameter, and the oil of oil cylinder epicoele makes the pressure off-load through prefill valve (25) oil sump tank.
5, return: digital control system is instructed to servomotor; Servomotor drives two-way constant displacement pump speed change counter-rotating, and oil pump output fluid one tunnel is opened prefill valve (25) through shuttle valve (80), check valve (60), reversal valve (40); The fluid of oil cylinder epicoele is through the most of oil sump tank of prefill valve; Another part is got back to the inlet port of two-way constant displacement pump, and another road binders liquid gets into the oil cylinder cavity of resorption through poppet valve (120), and oil cylinder is return upwards fast.Opening speed can obtain friction speed through the rotating speed speed that digital control system is controlled servomotor.
System of the present invention aims at the supporting use of servo pump control system electricity liquid Synchronous Bending machine.Adopt the closed loop synchronous control system of volumetric speed control hydraulic principle,, liquid resistance (130) and liquid resistance (140) replaced to suitable plug through conversion to prefill valve (25) oil inlet and outlet, compatibility open type and two kinds of prefill valves of normally closed property adaptability in the present invention.Have energy-efficient, the characteristics that synchronization accuracy is high.
Claims (2)
1. novel servopump control bender hydraulic control system comprises the power source, the control valve group that are connected with digital control system, it is characterized in that power source comprises servomotor and the two-way constant displacement pump, the fuel tank that are connected with servomotor; The control valve group comprises pressure valve, the unloader of shuttle valve and regulating system pressure, also comprises check valve, reversal valve, counterbalance valve, poppet valve, safety valve and prefill valve; The oil inlet and outlet of two-way constant displacement pump is controlled through shuttle valve, and the forward oil-out directly connects the oil cylinder epicoele, and reverse oil-out connects the oil cylinder cavity of resorption through poppet valve, counterbalance valve; The oil inlet and outlet of two-way constant displacement pump is through check valve, reversal valve, prefill valve connected tank; Prefill valve connects control valve; Be connected with safety valve between fuel tank and the oil cylinder cavity of resorption.
2. control as claimed in claim 1 system is characterized in that prefill valve connects often to open or the control valve of normally closed pattern.
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| CN2011103953867A CN102513413B (en) | 2011-12-03 | 2011-12-03 | Hydraulic control system for novel servo pump control bending machine |
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| CN2011103953867A CN102513413B (en) | 2011-12-03 | 2011-12-03 | Hydraulic control system for novel servo pump control bending machine |
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| CN102513413A true CN102513413A (en) | 2012-06-27 |
| CN102513413B CN102513413B (en) | 2013-11-06 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103170531A (en) * | 2013-03-21 | 2013-06-26 | 安徽中德机床股份有限公司 | Electro-hydraulic synchronization numerically controlled bending machine servo pump driving device |
| CN103611767A (en) * | 2013-12-16 | 2014-03-05 | 南京埃斯顿自动化股份有限公司 | Method for controlling position of sliding block of electro-hydraulic double-cylinder bending machine |
| CN103758811A (en) * | 2014-01-08 | 2014-04-30 | 江苏大洋精锻有限公司 | Bypass pressure relief system |
| CN105240329A (en) * | 2015-11-02 | 2016-01-13 | 山东富力世新型材料有限公司 | Servo pump control hydraulic system |
| CN106424227A (en) * | 2016-10-12 | 2017-02-22 | 中国空气动力研究与发展中心高速空气动力研究所 | Mechanical-electrical-liquid integration control method for multi-actuator system |
| CN106762892A (en) * | 2017-02-14 | 2017-05-31 | 南京麦克菲自动控制有限公司 | A kind of numerical control bending machine hydraulic system of use BID SVP hybrid powers control |
| CN107120324A (en) * | 2017-04-24 | 2017-09-01 | 登派液压技术（上海）有限公司 | Gear pump control hydraulic control system of bender |
| CN107120323A (en) * | 2017-04-24 | 2017-09-01 | 登派液压技术（上海）有限公司 | Bender bidirectional pump liquid pressure control system |
| CN108252967A (en) * | 2017-12-19 | 2018-07-06 | 天水锻压机床(集团)有限公司 | A kind of Hydraulic system and control method for being used to control energy-saving pump |
| CN108317117A (en) * | 2018-04-02 | 2018-07-24 | 中国船舶重工集团公司第七〇九研究所 | A kind of double nargin SERVO CONTROL valve groups of low throttling noise |
| CN108412823A (en) * | 2018-05-09 | 2018-08-17 | 登派液压技术（上海）有限公司 | A kind of single cylinder positioning power unit |
| CN110307195A (en) * | 2019-07-09 | 2019-10-08 | 燕山大学 | A kind of hydraulic bending press electrohydraulic control system of closed model pump control asymmetrical cylinder |
| 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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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103170531A (en) * | 2013-03-21 | 2013-06-26 | 安徽中德机床股份有限公司 | Electro-hydraulic synchronization numerically controlled bending machine servo pump driving device |
| CN103611767A (en) * | 2013-12-16 | 2014-03-05 | 南京埃斯顿自动化股份有限公司 | Method for controlling position of sliding block of electro-hydraulic double-cylinder bending machine |
| CN103758811A (en) * | 2014-01-08 | 2014-04-30 | 江苏大洋精锻有限公司 | Bypass pressure relief system |
| CN105240329A (en) * | 2015-11-02 | 2016-01-13 | 山东富力世新型材料有限公司 | Servo pump control hydraulic system |
| CN106424227A (en) * | 2016-10-12 | 2017-02-22 | 中国空气动力研究与发展中心高速空气动力研究所 | Mechanical-electrical-liquid integration control method for multi-actuator system |
| CN106762892A (en) * | 2017-02-14 | 2017-05-31 | 南京麦克菲自动控制有限公司 | A kind of numerical control bending machine hydraulic system of use BID SVP hybrid powers control |
| CN107120324A (en) * | 2017-04-24 | 2017-09-01 | 登派液压技术（上海）有限公司 | Gear pump control hydraulic control system of bender |
| CN107120323A (en) * | 2017-04-24 | 2017-09-01 | 登派液压技术（上海）有限公司 | Bender bidirectional pump liquid pressure control system |
| CN108252967A (en) * | 2017-12-19 | 2018-07-06 | 天水锻压机床(集团)有限公司 | A kind of Hydraulic system and control method for being used to control energy-saving pump |
| CN108317117A (en) * | 2018-04-02 | 2018-07-24 | 中国船舶重工集团公司第七〇九研究所 | A kind of double nargin SERVO CONTROL valve groups of low throttling noise |
| CN108317117B (en) * | 2018-04-02 | 2024-01-05 | 中国船舶重工集团公司第七一九研究所 | Double-margin servo control valve group with low throttle noise |
| CN108412823A (en) * | 2018-05-09 | 2018-08-17 | 登派液压技术（上海）有限公司 | A kind of single cylinder positioning power unit |
| CN110307195A (en) * | 2019-07-09 | 2019-10-08 | 燕山大学 | A kind of hydraulic bending press electrohydraulic control system of closed model pump control asymmetrical cylinder |
| CN110307195B (en) * | 2019-07-09 | 2021-02-23 | 燕山大学 | Hydraulic bending machine electro-hydraulic control system of closed pump-controlled asymmetric cylinder |
| 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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Effective date of registration: 20151020 Address after: 211100, No. 155, general road, Jiangning Development Zone, Nanjing, Jiangsu Patentee after: Nanjing Estun Automation Co., Ltd. Address before: 211102 No. 178 Yan Hu Road, Jiangning Development Zone, Jiangsu, Nanjing, China Patentee before: Aierfa Electrohydraulic Technology Co., Ltd., Nanjing City Patentee before: Nanjing Estun Automation Co., Ltd. |