CN107246415A - A kind of servo-drive band variable pump low speed control hydraulic circuit - Google Patents

A kind of servo-drive band variable pump low speed control hydraulic circuit Download PDF

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Publication number
CN107246415A
CN107246415A CN201710646856.XA CN201710646856A CN107246415A CN 107246415 A CN107246415 A CN 107246415A CN 201710646856 A CN201710646856 A CN 201710646856A CN 107246415 A CN107246415 A CN 107246415A
Authority
CN
China
Prior art keywords
oil
pump
valve
servo
low speed
Prior art date
Application number
CN201710646856.XA
Other languages
Chinese (zh)
Inventor
张旭峰
龚滨王
李日生
储进静
Original Assignee
无锡海天机械有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 无锡海天机械有限公司 filed Critical 无锡海天机械有限公司
Priority to CN201710646856.XA priority Critical patent/CN107246415A/en
Publication of CN107246415A publication Critical patent/CN107246415A/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02Installations or systems with accumulators
    • F15B1/024Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04Special measures taken in connection with the properties of the fluid
    • F15B21/041Removal or measurement of solid or liquid contamination, e.g. filtering
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/20Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205Systems with pumps
    • F15B2211/20507Type of prime mover
    • F15B2211/20515Electric motor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/20Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205Systems with pumps
    • F15B2211/2053Type of pump
    • F15B2211/20546Type of pump variable capacity
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/20Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/212Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/60Circuit components or control therefor
    • F15B2211/615Filtering means

Abstract

The present invention discloses a kind of servo-drive band variable pump low speed control hydraulic circuit, loop oil filter F2 is connected with system oil-out T and system safety valve V1, system oil inlet P prevents back check valve V2 to be connected with system safety valve V1, Variable plunger pump P2 and control oil, Variable plunger pump P2 is connected with servomotor MTR, oil-suction oil filter F1 and oil pump swinging angle control valve V4, and control oil prevents back check valve V2 to be connected with pressure gauge B1, oil pump swinging angle control valve V4, accumulator F3 and relief valve V3.Oil pump capacity is variable adjustable in the present invention, the pivot angle size of oil pump can be adjusted according to different demands, to meet different working condition requirements, the particularly low occasion of rate request, reduce the pivot angle of oil pump to reduce discharge capacity output, the traffic demand of system is met by putting forward high-revolving mode, the speed setting of servo power is based on its limit value, both parameters of matching in the range of its stability contorting.

Description

A kind of servo-drive band variable pump low speed control hydraulic circuit

Technical field

The present invention relates to a kind of hydraulic circuit, especially a kind of servo-drive band variable pump low speed control hydraulic circuit.

Background technology

Modern injection machine often uses hydraulic circuit of the servo power with gear pump (quantitative) pattern, as shown in figure 1, system oil-feed Mouth P, quantitative gear pump P1 and oil-suction oil filter F1 are sequentially connected, and quantitative gear pump P1 is connected with servomotor MTR, loop oil strain Device F2 is connected with system oil-out T and system safety valve V1, system safety valve V1 and system oil inlet P and quantitative gear pump P1 is connected.It is characterized in simple and reliable, most production requirement can be met, but for the specific demand of special industry, there is it Weak point, for needing the high occasion of low-speed performance, because quantitative gear pump P1 discharge capacities are fixed, can only control its rotating speed to reduce Flow is exported, and the stability that servomotor MTR is exported for minimum speed has a limit value, less than its stability meeting after this value It is uncontrollable, so as to influence the stability of system.

The content of the invention

To solve the defect that prior art is present, the present invention provides a kind of servo-drive band variable pump low speed control hydraulic pressure and returned Road.

To achieve the above object, the present invention uses following technical proposals:

A kind of servo-drive band variable pump low speed control hydraulic circuit, low speed control hydraulic circuit includes system oil inlet P, oil-suction oil filter F1, servomotor MTR, system oil-out T and return oil filter F2, loop oil filter F2 and system oil-out T and system safety valve V1 be connected, the low speed control hydraulic circuit also include Variable plunger pump P2, oil pump swinging angle control valve V4, Relief valve V3, accumulator F3, pressure gauge B1 and control oil prevent back check valve V2, system oil inlet P and system safety valve V1, change Amount plunger pump P2 and control oil prevent back check valve V2 to be connected, Variable plunger pump P2 and servomotor MTR, oil-suction oil filter F1 And oil pump swinging angle control valve V4 is connected, control oil prevents back check valve V2 and pressure gauge B1, oil pump swinging angle control valve V4, accumulation of energy Device F3 and relief valve V3 is connected.

Using above-mentioned technical proposal, system oil inlet P, oil-suction oil filter F1, system oil-out T and return oil filter F2 shapes Into an oil circuit loop.Power matches somebody with somebody Variable plunger pump P2 using servomotor MTR, and oil pump swinging angle control valve V4 can be according to different need Ask to control the action of small oil tank to go to change oil pump pivot angle, realize that small displacement is exported.Accumulator F3 stores as the pressure of control oil Energy.Relief valve V3, normality is normally opened, is closed mode during work, accumulator F3 is kept operating pressure.Pressure gauge B1 is used for real When monitoring and controlling oil pressure.Control oil prevents back check valve V2 from stopping that relief valve V3 controls oil to be back to oil-feed stream after opening In.

Further, electric Enable Pin D4 is provided with to obtain on oil pump swinging angle control valve V4.

Further, electric same electric motor starting Enable Pin D3 is provided with to obtain on relief valve V3.

Beneficial effect:

Compared to hydraulic circuit of the servo power with gear pump (quantitative) pattern, oil pump capacity is variable adjustable in the present invention , the pivot angle size of oil pump can be adjusted according to different demands, to meet the field that different working condition requirements, particularly rate request are low Close, reduce the pivot angle of oil pump to reduce discharge capacity output, the traffic demand of system is met by putting forward high-revolving mode, servo is moved The speed setting of power is based on its limit value, both parameters of matching in the range of its stability contorting.

Brief description of the drawings

Fig. 1 is that existing conventional servo controls hydraulic loop structure figure.

Fig. 2 is servo-drive of the present invention band variable pump low speed control hydraulic loop structure figure.

Embodiment

The present invention is further described with reference to the accompanying drawings and examples.

A kind of servo-drive band variable pump low speed control hydraulic circuit of the present invention, as shown in Fig. 2 it includes system oil inlet P, oil-suction oil filter F1, servomotor MTR, system oil-out T, return oil filter F2, Variable plunger pump P2, oil pump swinging angle control Valve V4, relief valve V3, accumulator F3, pressure gauge B1 and control oil prevent back check valve V2, and loop oil filter F2 and system are fuel-displaced Mouth T and system safety valve V1 is connected, and system oil inlet P is prevented with system safety valve V1, Variable plunger pump P2 and control oil Back check valve V2 is connected, Variable plunger pump P2 and servomotor MTR, oil-suction oil filter F1 and oil pump swinging angle control valve V4 phases Even, control oil prevents back check valve V2 to be connected with pressure gauge B1, oil pump swinging angle control valve V4, accumulator F3 and relief valve V3;

Electric Enable Pin D4 is provided with to obtain on oil pump swinging angle control valve V4;

Electric same electric motor starting Enable Pin D3 is provided with to obtain on relief valve V3.

A kind of servo-drive band variable pump low speed of the present invention controls hydraulic circuit, and its operation principle is:Power uses servo Motor MTR matches somebody with somebody Variable plunger pump P2, and oil pump pivot angle can be changed by small oil tank, by machinery positioning after the angle setting of change, Discharge capacity output when ensureing small pivot angle is highly stable, flow oscillation will not be produced because of the change of pivot angle, so as to influence flow waves Dynamic, the action of small oil tank is controlled by oil pump swinging angle control valve V4, and small oil tank is failure to actuate during normality, i.e., oil pump pivot angle is maximum, is needed Want to obtain electric Enable Pin D4 during small pivot angle and obtain electric, control oil ejects small oil tank, even if oil pump pivot angle shifts setting pivot angle onto, realizes small Discharge capacity is exported.Wherein, system oil inlet P, oil-suction oil filter F1, system oil-out T and return oil filter F2 one oil circuit of formation Loop.Power matches somebody with somebody Variable plunger pump P2 using servomotor MTR, and oil pump swinging angle control valve V4 can control small according to different demands The action of oil cylinder goes to change oil pump pivot angle, realizes that small displacement is exported.Accumulator F3 is used as the oily pressure accumulation of energy of control.Relief valve V3, normality is normally opened, obtains electric same electric motor starting Enable Pin D3 and obtains electric, that is, is closed mode when working, accumulator F3 is kept work Make pressure.Pressure gauge B1 is used for the pressure of real-time inspection and control oil.Control oil prevents back check valve V2 from stopping that relief valve V3 is opened Control oil is back in oil-feed stream afterwards.

The setting of small pivot angle is determined by each working condition requirement, it is assumed that small displacement requires 10% maximum pump discharge, and just setting is worked as When the input of computer sets requirement flow is 10% and is following, small pivot angle is switched to, real electrical machinery rotating speed is corresponding to setting data Rotating speed is multiplied by 10, is 2000 turns of calculating by motor maximum (top) speed, during 10% input requirements, and motor speed is 200 turns, now oil pump Small pivot angle has been switched to, has now been transferred to 200 with 10, real electrical machinery rotating speed is 2000 turns, that is, maximum speed, and works as rotating speed During fluctuation, because discharge capacity is small, reality output flowed fluctuation is smaller, in this way in big swing angle, and 200 turns of rotating speed is defeated when the fluctuation of speed The fluctuation of outflow will relatively small pivot angle high rotating speed when fluctuation will be big it is many, for the high occasion of low speed requirement, such a control Mode processed can be highly stable.

In summary, the present invention avoids the slow-speed of revolution unstable region of motor, makes motor speed in reasonably stability Regional work, eliminates a destabilizing factor of servomotor in low speed control;(pump hardware requirement is most in small pivot angle for oil pump It is more than small pivot angle) when discharge capacity export than huge discharge when fluctuation it is small, be conducive in low speed improve to moving component Stability;In normal time pressurize, because oil pump pivot angle is small, motor output torque can be substantially reduced, and motor current value now is just Can be very small, reach the effect of energy-conservation.

Limiting the scope of the invention, one of ordinary skill in the art should be understood that in technical scheme On the basis of, those skilled in the art need not pay the various modifications that creative work can make or deformation still the present invention's Within protection domain.

Claims (3)

1. a kind of servo-drive band variable pump low speed control hydraulic circuit, the low speed control hydraulic circuit includes system oil inlet P, oil-suction oil filter F1, servomotor MTR, system oil-out T and return oil filter F2, loop oil filter F2 and system oil-out T and system safety valve V1 is connected, it is characterised in that:The low speed control hydraulic circuit also includes Variable plunger pump P2, oil pump Swinging angle control valve V4, relief valve V3, accumulator F3, pressure gauge B1 and control oil prevent back check valve V2, and system oil inlet P is with being System safety valve V1, Variable plunger pump P2 and control oil prevent back check valve V2 to be connected, Variable plunger pump P2 and servomotor MTR, oil-suction oil filter F1 and oil pump swinging angle control valve V4 are connected, and control oil prevents back check valve V2 and pressure gauge B1, oil pump Swinging angle control valve V4, accumulator F3 and relief valve V3 are connected.
2. servo-drive band variable pump low speed control hydraulic circuit according to claim 1, it is characterised in that:The oil pump Electric Enable Pin D4 is provided with to obtain on swinging angle control valve V4.
3. servo-drive band variable pump low speed control hydraulic circuit according to claim 1, it is characterised in that:The pressure release Electric same electric motor starting Enable Pin D3 is provided with to obtain on valve V3.
CN201710646856.XA 2017-08-01 2017-08-01 A kind of servo-drive band variable pump low speed control hydraulic circuit CN107246415A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710646856.XA CN107246415A (en) 2017-08-01 2017-08-01 A kind of servo-drive band variable pump low speed control hydraulic circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710646856.XA CN107246415A (en) 2017-08-01 2017-08-01 A kind of servo-drive band variable pump low speed control hydraulic circuit

Publications (1)

Publication Number Publication Date
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5943203A (en) * 1982-09-03 1984-03-10 Kayaba Ind Co Ltd Hydraulic pressure control circuit
US5845493A (en) * 1996-05-31 1998-12-08 Dr. Boy Gmbh Method and apparatus for operating a hydraulic drive
CN202412646U (en) * 2011-12-29 2012-09-05 浙江申达机器制造股份有限公司 Multi-pump energy-saving hydraulic loop for large-injection amount injection molding machine
CN202623216U (en) * 2012-05-30 2012-12-26 无锡海天机械有限公司 Servo injection molding machine injection flow precise control system
CN103267034A (en) * 2013-05-10 2013-08-28 浙江大学 Load sensitive hydraulic system with compensation valve energy recovery function
CN204284038U (en) * 2014-11-25 2015-04-22 无锡海天机械有限公司 A kind of energy-saving dynamic system for Servo Injection Molding Machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5943203A (en) * 1982-09-03 1984-03-10 Kayaba Ind Co Ltd Hydraulic pressure control circuit
US5845493A (en) * 1996-05-31 1998-12-08 Dr. Boy Gmbh Method and apparatus for operating a hydraulic drive
CN202412646U (en) * 2011-12-29 2012-09-05 浙江申达机器制造股份有限公司 Multi-pump energy-saving hydraulic loop for large-injection amount injection molding machine
CN202623216U (en) * 2012-05-30 2012-12-26 无锡海天机械有限公司 Servo injection molding machine injection flow precise control system
CN103267034A (en) * 2013-05-10 2013-08-28 浙江大学 Load sensitive hydraulic system with compensation valve energy recovery function
CN204284038U (en) * 2014-11-25 2015-04-22 无锡海天机械有限公司 A kind of energy-saving dynamic system for Servo Injection Molding Machine

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Application publication date: 20171013

RJ01 Rejection of invention patent application after publication