CN102513413B - Hydraulic control system for novel servo pump control bending machine - Google Patents

Hydraulic control system for novel servo pump control bending machine Download PDF

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Publication number
CN102513413B
CN102513413B CN2011103953867A CN201110395386A CN102513413B CN 102513413 B CN102513413 B CN 102513413B CN 2011103953867 A CN2011103953867 A CN 2011103953867A CN 201110395386 A CN201110395386 A CN 201110395386A CN 102513413 B CN102513413 B CN 102513413B
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China
Prior art keywords
valve
control
oil
pump
pressure
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CN2011103953867A
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Chinese (zh)
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CN102513413A (en
Inventor
余继军
柳倩希
陈华
张党龙
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南京埃尔法电液技术有限公司
南京埃斯顿自动化股份有限公司
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Priority to CN2011103953867A priority Critical patent/CN102513413B/en
Publication of CN102513413A publication Critical patent/CN102513413A/en
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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

The servo-pump control hydraulic control system of bender

Technical field

The invention belongs to technical field of hydraulic, be specifically related to a kind of GIGAbend Folding System hydraulic control system, i.e. 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 larger offset loading force in the bender impulse stroke, can produce larger unbalance loading moment to equipment, can not guarantee the displacement accuracy of oil cylinder, main unit mechanism is deformed, cause the bender precision low, while control section complex structure, fault rate is high, leak serious, move unstablely, impact greatly, descend soon speed unadjustable, take up room larger, maintenance is inconvenient.

At present, the hydraulic control system principle of domestic electro-hydraulic servo Synchronous Bending machine is similar, and substantially do not become decades, is valve control system, adopts the throttle grverning principle, and energy loss is large, and system easily generates heat, and efficient is low.

Along with the development of World Economics, " saving energy and reduce the cost " puts on agenda, and hydraulic technique is also to energy-efficient future development, for this reason, and in the urgent need to development of new pump control bender hydraulic system.

Summary of the invention

The objective of the invention is for present situation, aim at a kind of hydraulic control system for novel servo pump control bending machine that servo-pump control electricity liquid Synchronous Bending machine system proposes.

System of the present invention adopts servomotor to add the volumetric speed control principle of two-way quantitative 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 greatly spill losses, greatly improves system effectiveness.Simultaneously, adopt the two-way quantitative pump, utilize the rotating of servomotor, change the fluid flow direction of pump, directly the direction of motion of control load, substituted original proportional servo valve, reduce drag losses and the leakage loss of reversal valve, further reduced energy consumption, saved cost.Along with the development of hydraulic technique to energy-efficient direction, control system of the present invention can replace former valve control system.

Main technical schemes of the present invention: hydraulic control system for novel servo pump control bending machine, 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 quantitative 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 quantitative pump is controlled through shuttle valve, and the forward oil-out directly connects cylinder upper cavity oil, and oppositely oil-out connects the oil cylinder cavity of resorption through poppet valve, counterbalance valve; The oil inlet and outlet of two-way quantitative 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 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 the two-way quantitative pump and make the commutation of liquid stream, and carry out speed by the flow that the rotating speed that changes servomotor changes pump and regulate, omit proportional servo valve, reduced drag losses and pressure leakage loss and system's spill losses of reversal valve.By the rotating speed of servomotor control pump, make its no-load power consumption minimum during this system dry run.When servomotor started, pump was close to starting without flow without pressure, and starting power is minimum.At packing stage, when system pressure reached setting pressure, the two-way quantitative pump almost can stall, and overflow valve is almost without the fluid overflow.Adapt to the requirement of various bending operating modes due to the output flow of pump, 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; Control by the precise rotation of servomotor and produce higher synchronization accuracy and response fast.

Description of drawings

Accompanying drawing 1 is embodiment of the present invention control system syndeton schematic diagram.

In 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 tap; MX2-X2 pressure tap; MX3-X3 pressure tap; M2.1-cylinder rod chamber pressure tap; 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: the present embodiment control system syndeton mainly comprises the power source, the control valve group that are connected with digital control system as shown in Figure 1, and its main feature is that power source comprises servomotor and the two-way quantitative pump, the fuel tank that are connected with servomotor; The control valve group comprises for the pressure valve of regulating system pressure (90), unloader (50), 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 quantitative pump is controlled through shuttle valve (80), oil pump forward oil-out X1 directly connects cylinder upper cavity oil (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 quantitative 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 oil cylinder cavity of resorption.When prefill valve (25) is the SFE type, liquid resistance (130) blocks, and when prefill valve (25) is the PV type, liquid resistance (140) blocks.

The present embodiment operates like this, and sequence of movement is as shown in the table

One, pressure is controlled: start Oil pump electrical machinery, according to the difference of working stage, control by the pressure selection of shuttle valve (80), realize bidirection press output; The pressure of pressure valve (90) regulator solution pressing system is to satisfy the requirement of bending power.

Two, operation cycle

1, under fast: digital control system is to the servomotor instruction, servomotor drives two-way quantitative pump speed change forward, oil pump output fluid, fluid enters cylinder upper cavity oil, one the tunnel through shuttle valve (80), check valve (60), reversal valve (40), prefill valve (25) is opened, and fuel tank fluid enters cylinder upper cavity oil 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 by the rotating speed speed that digital control system is controlled servomotor soon.

2, work is advanced: digital control system is to the servomotor instruction, and servomotor drives two-way quantitative pump speed change forward, and oil pump output fluid enters cylinder upper cavity oil, and the downward work of oil cylinder is advanced, 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 by the rotating speed speed that digital control system is controlled servomotor.

3, pressurize: digital control system is to the servomotor instruction, and servomotor drives two-way quantitative 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 to the servomotor instruction, servomotor drives the counter-rotating of two-way quantitative pump speed change, oil pump output oil enters the oil cylinder cavity of resorption, slide block is slowly up, Top Runby can be adjusted by regulating the digital control system parameter, the off-load process time used, the oil of cylinder upper cavity oil made the pressure off-load by prefill valve (25) oil return case by the decompression rate setting parameter.

5, return: digital control system is to the servomotor instruction, servomotor drives the counter-rotating of two-way quantitative pump speed change, oil pump output fluid one tunnel is through shuttle valve (80), check valve (60), reversal valve (40), prefill valve (25) is opened, the fluid of cylinder upper cavity oil is by the most of oil return case of prefill valve, another part is got back to the inlet port of two-way quantitative pump, and another road binders liquid enters the oil cylinder cavity of resorption by poppet valve (120), and oil cylinder is return upwards fast.Opening speed can obtain friction speed by the rotating speed speed that digital control system is controlled servomotor.

System of the present invention aims at servo-pump control system electricity liquid Synchronous Bending machine to support the use.Adopt the closed loop synchronous control system of volumetric speed control hydraulic principle, by the conversion to prefill valve (25) oil inlet and outlet, liquid resistance (130) and liquid resistance (140) are replaced to suitable plug, 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. the servo-pump control hydraulic control system of bender, 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 quantitative 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 quantitative pump is controlled through shuttle valve, and the forward oil-out directly connects cylinder upper cavity oil, and oppositely oil-out connects the oil cylinder cavity of resorption through poppet valve, counterbalance valve; The oil inlet and outlet of two-way quantitative 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 oil cylinder cavity of resorption.
2. control system as claimed in claim 1, is characterized in that the prefill valve connection is often left or the control valve of normally closed pattern.
CN2011103953867A 2011-12-03 2011-12-03 Hydraulic control system for novel servo pump control bending machine CN102513413B (en)

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CN102513413B true CN102513413B (en) 2013-11-06

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* Cited by examiner, † Cited by third party
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
CN103611767B (en) * 2013-12-16 2015-06-03 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
CN106424227B (en) * 2016-10-12 2018-04-03 中国空气动力研究与发展中心高速空气动力研究所 A kind of mechanical-electrical-hydraulic integration control method for multi executors 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
CN107120324B (en) * 2017-04-24 2018-07-31 登派液压技术(上海)有限公司 Gear pump control hydraulic control system of bender
CN107120323B (en) * 2017-04-24 2018-10-26 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
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

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US5447027A (en) * 1993-03-23 1995-09-05 Hitachi Construction Machinery Co., Ltd. Hydraulic drive system for hydraulic working machines
CN1865746A (en) * 2005-05-17 2006-11-22 沈阳东北电力调节技术有限公司 Integrated electro-hydraulic actuator capable of carrying out quick action and adjustment
CN101865184A (en) * 2009-04-14 2010-10-20 上海汇益液压控制系统工程有限公司 Direct-drive redundant hydraulic system for servomotor
CN202356469U (en) * 2011-12-03 2012-08-01 南京埃尔法电液技术有限公司 Novel hydraulic control system of servo pump-controlled bending machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5447027A (en) * 1993-03-23 1995-09-05 Hitachi Construction Machinery Co., Ltd. Hydraulic drive system for hydraulic working machines
CN1865746A (en) * 2005-05-17 2006-11-22 沈阳东北电力调节技术有限公司 Integrated electro-hydraulic actuator capable of carrying out quick action and adjustment
CN101865184A (en) * 2009-04-14 2010-10-20 上海汇益液压控制系统工程有限公司 Direct-drive redundant hydraulic system for servomotor
CN202356469U (en) * 2011-12-03 2012-08-01 南京埃尔法电液技术有限公司 Novel hydraulic control system of servo pump-controlled bending machine

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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.

C41 Transfer of patent application or patent right or utility model