CN202356469U - Novel hydraulic control system of servo pump-controlled bending machine - Google Patents

Novel hydraulic control system of servo pump-controlled bending machine Download PDF

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Publication number
CN202356469U
CN202356469U CN2011204958914U CN201120495891U CN202356469U CN 202356469 U CN202356469 U CN 202356469U CN 2011204958914 U CN2011204958914 U CN 2011204958914U CN 201120495891 U CN201120495891 U CN 201120495891U CN 202356469 U CN202356469 U CN 202356469U
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CN
China
Prior art keywords
valve
control
oil
pressure
oil cylinder
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CN2011204958914U
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Chinese (zh)
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 CN2011204958914U priority Critical patent/CN202356469U/en
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Publication of CN202356469U publication Critical patent/CN202356469U/en

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Abstract

The utility model belongs to the technical field of hydraulic control and in particular relates to a novel hydraulic control system of a servo pump-controlled bending machine. The system comprises a power source connected with a numerical control system and a control valve bank, and the system is characterized in that the power source comprises a servo motor and a bidirectional fixed displacement pump connected with the servo motor and an oil tank; the control valve bank comprises a shuttle valve, a pressure valve used for adjusting the system pressure and an unloading valve, and the control valve bank further comprises a one-way valve, a reversing valve, a back pressure valve, a poppet valve, a safety valve and a charging valve; the oil inlet and the oil outlet of the bidirectional fixed displacement pump are controlled by the shuttle valve, a positive oil outlet is directly connected with the upper cavity of an oil cylinder, and a negative oil outlet is connected with the lower cavity of the oil cylinder through the poppet valve and the back pressure valve; the oil inlet and the oil outlet of the bidirectional fixed displacement pump are connected with the oil tank through the one-way valve, the reversing valve and the charging valve; the charging valve is connected with a 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 advantages of high efficiency, energy-saving property and high synchronous precision.

Description

Novel servopump control bender hydraulic control system

Technical field

The utility model belongs to technical field of hydraulic, is 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 purpose of the utility model is to present situation, aims at a kind of novel servopump control bender hydraulic control system that servopump control electricity liquid Synchronous Bending machine system is proposed.

The utility model system adopts servomotor to add the volumetric speed control principle of two-way constant displacement pump; Utilize the servomotor speed change, change the output flow of pump, to adapt to the requirement of the various operating mode speed of load; Reduce spill losses greatly, improved 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 utility model control system can replace former valve control system.

The main technical schemes of the utility model: 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, has the prefill valve control that Chang Kai or normally closed mode control valve all are applicable to the utility model.

The closed loop synchronous control system of the utility model system employs volumetric speed control hydraulic principle; 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 controlled system's syndeton sketch map for the utility model embodiment.

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 utility model 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.

The utility model system 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; Through 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 the adaptability of two kinds of prefill valves of normally closed property in the utility model.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.
CN2011204958914U 2011-12-03 2011-12-03 Novel hydraulic control system of servo pump-controlled bending machine CN202356469U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011204958914U CN202356469U (en) 2011-12-03 2011-12-03 Novel hydraulic control system of servo pump-controlled bending machine

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Application Number Priority Date Filing Date Title
CN2011204958914U CN202356469U (en) 2011-12-03 2011-12-03 Novel hydraulic control system of servo pump-controlled bending machine

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102513413A (en) * 2011-12-03 2012-06-27 南京埃尔法电液技术有限公司 Hydraulic control system for novel servo pump control bending machine
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
CN103511360A (en) * 2013-09-06 2014-01-15 天津优瑞纳斯液压机械有限公司 Hydraulic cylinder fast feeding system based on hydraulic servo closed-loop control
CN106122128A (en) * 2016-08-17 2016-11-16 江苏国力锻压机床有限公司 A kind of servo-pump control hydraulic press of high fine positioning

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102513413A (en) * 2011-12-03 2012-06-27 南京埃尔法电液技术有限公司 Hydraulic control system for novel servo pump control bending machine
CN102513413B (en) * 2011-12-03 2013-11-06 南京埃尔法电液技术有限公司 Hydraulic control system for novel servo pump control bending machine
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
CN103511360A (en) * 2013-09-06 2014-01-15 天津优瑞纳斯液压机械有限公司 Hydraulic cylinder fast feeding system based on hydraulic servo closed-loop control
CN103511360B (en) * 2013-09-06 2015-08-19 天津优瑞纳斯液压机械有限公司 The quick feeding system of oil hydraulic cylinder based on hydraulic servo closed loop control
CN106122128A (en) * 2016-08-17 2016-11-16 江苏国力锻压机床有限公司 A kind of servo-pump control hydraulic press of high fine positioning
CN106122128B (en) * 2016-08-17 2017-11-21 江苏国力锻压机床有限公司 A kind of servo-pump control hydraulic press of high fine positioning

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Granted publication date: 20120801

Effective date of abandoning: 20131106