CN104929992A - Energy-saving design method for variable-load servo control system - Google Patents
Energy-saving design method for variable-load servo control system Download PDFInfo
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- 238000013461 design Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000004146 energy storage Methods 0.000 claims abstract description 34
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 239000012530 fluid Substances 0.000 claims description 31
- 230000000694 effects Effects 0.000 claims description 16
- 238000006073 displacement reaction Methods 0.000 claims description 14
- 238000005086 pumping Methods 0.000 claims description 8
- 239000002828 fuel tank Substances 0.000 claims description 7
- 238000009825 accumulation Methods 0.000 claims description 2
- 238000004886 process control Methods 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 230000008929 regeneration Effects 0.000 abstract description 5
- 238000011069 regeneration method Methods 0.000 abstract description 5
- 238000004064 recycling Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 113
- 239000013589 supplement Substances 0.000 description 12
- 239000000945 filler Substances 0.000 description 11
- 238000001802 infusion Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000004134 energy conservation Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 239000010727 cylinder oil Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
- F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
- F15B9/04—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by varying the output of a pump with variable capacity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/14—Energy-recuperation means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
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- Fluid Mechanics (AREA)
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- General Engineering & Computer Science (AREA)
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- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to an energy-saving design method for a variable-load servo control system. According to a hydraulic system designed through the design method, fitting of matched load force is achieved through arbitrary combination of different pressure grades, and throttling losses of a valve port are reduced. Overall management of energy is achieved by means of an energy transmission unit and an energy storage unit. Control is conducted according to the working condition, so that regeneration and recycling of energy are achieved. The transmission efficiency of the system is improved on the premise that the control characteristic is guaranteed.
Description
Technical field
The invention belongs to hydraulics application, relate to a kind of energy-saving design method of varying load servo-control system.
Background technique
Hydraulic servocontrol as develop after 20th century 50, the sixties and the emerge science technology formed, high by means of its control accuracy, response is fast, stable drive, antijamming capability strong and the advantage such as high power density, obtains important application in national defense industry, Aero-Space, nonferrous smelting, energetics, Vehicle Engineering, field of petrochemical industry.But due in conventional hydraulic transmission, owing to there is a large amount of pressure unmatcheds, flow do not mate, and causes a large amount of restriction losses and spill losses.Bring the problems such as Hydrauservo System transmission efficiency is low, heating value is large, cause serious energy waste and environmental pollution, more very have influence on competitive ability and the application area of Hydraulic servo technology.Therefore seek a kind of novel energy match servo-control system, matched load power to greatest extent, and reduce system spill losses and restriction loss, very urgent.
At present, patent for Energy-saving Design of Hydraulic has a kind of independent electrohydraulic load sensitive energy regeneration hydraulic system of engineering machinery load port disclosed in CN101413522A, divided working status selects control strategy, decreases the energy-conservation loss of system, achieves the regeneration of energy surmounting load; Pump control and valve control combine the speed that realizes and Energy Saving Control, but using scope is limited, and versatility is not strong.Disclosed in patent CN201575006U, a kind of start and stop, discontinuous operation utilizing Frequency Converter Control pump, reaches the energy-conservation of system.But be limited to the feature of the low-response of variable-frequency motor, require that higher occasion should not use in control accuracy.A kind of positive flow hydraulic energy-saving control system disclosed in patent CN202215255U, by the comparison of logical groups to all pilot control signals, exports controlled variable pump by maximum pilot pressure and adapts with it, thus reduces the by-pass throttle loss of pump.But the existence of logical valve group, not only adds the complexity of system, but also has influence on the speed of response of system.The disclosed a kind of accumulator that uses of patent CN103174688A reclaims rod chamber fluid when hydraulic cylinder piston rod stretches out, during backhaul and pumping source jointly as power source, solve return line and overflow passage hydraulic oil loss, reach energy-conservation object, but without coupling, valve port restriction loss is still serious.For the defect in above-mentioned research, technical problem to be solved by this invention is to provide a kind of energy-saving design method of varying load servo-control system, the method, and consider energy regenerating simultaneously and reduce restriction loss problem, full working scope covers.
Summary of the invention
The object of the invention is for the low problem of the capacity usage ratio existed in varying load Hydrauservo System, a kind of energy-saving design method of the varying load servo-control system based on load force coupling is provided.
The object of the invention is to be achieved through the following technical solutions:
Varying load servocontrol energy conserving system involved by energy-saving design method of the present invention is made up of switch valve, motor, metering pump, one-way valve, safety valve, quantitative pump/motor, clutch, pump/motor, pressure transducer, accumulator, controller, servovalve, selector valve, oil hydraulic cylinder, low-pressure reservoir and fuel tank, it is characterized in that: varying load servocontrol energy conserving system comprises 4 oil circuits, be respectively the stored energy oil circuit R high-pressure oil passage H different with three pressure ratings, middle force feed road M, low pressure oil way T; In system, metering pump is by driven by motor, and oil circuit is divided into three oil circuits in parallel at pumping hole: a connecting valve valve, plays pumping source Unloading Effect; , a connection safety valve, plays safety effect; Article one, after pumping hole one-way valve, be connected to system high pressure oil circuit H, as working oil path, high-pressure oil passage H connects four points of oil circuits again respectively, wherein one connects high pressure accumulator H, play [constant effect, and be connected to pressure transducer, gather pressure signal and feed back to controller; A link variable pump/motor after switch valve, logical oil sump tank, as a part for energy transferring unit; Remain two oil circuits be connected to left and right two switch valves in one, as the high-pressure oil passage leading to final controlling element; Middle force feed road M connects four points of oil circuits respectively, and wherein one connects intermediate-pressure accumulator M, plays [constant effect, and is connected to pressure transducer, gathers pressure signal and feeds back to controller; One connects quantitative pump/motor after switch valve, and logical oil sump tank, as a part for energy transferring unit; Remain two oil circuits be connected to left and right two switch valves in one, as leading to force feed road in final controlling element; Low pressure oil way T connects three points of oil circuits, two be connected to left and right two switch valves in one, as the low pressure oil way leading to final controlling element, remain one connection low-pressure reservoir after oil sump tank; Stored energy oil circuit R connects three points of oil circuits, and wherein one connects energy storage accumulator R, plays energy storage effect, and is connected to pressure transducer, gathers pressure signal and feeds back to controller; One after switch valve link variable pump/motor and fuel tank connect, and to be connected, as a part for energy transferring unit with quantitative pump/motor that is high, middle force feed road respectively by clutch; Remain an oil circuit connection safety valve, play safety protection effect; Oil circuit is after the switch valve of left and right two, Left-wing Federation's switch valve connects a hydraulic fluid port of two position and four-way reversing valves after servovalve, right switch valve then directly connects another hydraulic fluid port of two position and four-way reversing valves, two position and four-way reversing valve oil outlets respectively connecting fluid cylinder pressures into and out of hydraulic fluid port, oil hydraulic cylinder two chamber is connected to pressure transducer respectively, gathers pressure signal and feeds back to controller; Hydraulic cylinder piston rod is connected to displacement transducer, gather displacement signal and feed back to controller, the input signal of controller is the displacement signal that the pressure signal that gathers of each pressure transducer and displacement transducer gather, output signal the make-and-break signal for controlling each switch valve, selector valve commutation signal, control the electrical signal of servovalve valve port opening and pump/motor.
Described controller is PC process control machine or programmable controller.
The energy-saving design method of described varying load servo-control system, its energy-saving principle is specially:
Constant voltage oil circuit and the accumulation of energy oil circuit R of H, M, T tri-pressure ratings are set in system, without spill losses, only there is the off-load loss of metering pump; By any combination of two of oil hydraulic cylinder into and out of oil circuit high, medium and low different pressures grade, draw 9 kinds of ouput forces varied in size at the most, controller controls the transfer sequence of different pressures grade combination flexibly, oil hydraulic cylinder ouput force is mated with load force matching to greatest extent, reduces the restriction loss of servovalve valve port; Each pressure rating oil circuit (except T) is communicated with energy storage oil circuit R through energy transferring unit, controller is according to feedback signal, efficiently, each switch valve of conservative control, pump/motor, the constant voltage oil circuit of effective management three pressure ratings and energy storage oil circuit R, realize the transmission (standard differential circuit and equivalent differential circuit) of energy and energy storage (recovery of energy), improve the energy saving of system.
The constant voltage oil circuit combination of two of three described pressure ratings, more pressure rating and energy transferring unit can be set on this basis, often add a pressure rating, namely 2n+1 kind force combination is increased, the grade of exerting oneself of oil hydraulic cylinder incites somebody to action more crypto set, strengthen the ability of matching varying load power, obtain better energy-saving effect.
Advantage of the present invention:
1) efficiency is high.In traditional hydraulic system, pumping hole, throttle orifice exist larger spill losses and and restriction loss, and varying load servo energy-saving control system, partial pressure grade designs, by load force is mated, any pressure rating combination of two, achieves the coupling of load force substantially, reduces valve port restriction loss.And system is without overflow, energy is recyclable, therefore energy utilization rate is high, good energy-conserving effect.
2) regeneration of energy.The differential circuit of standard only can be produced in traditional hydraulic system, and varying load servo energy-saving control system, due to the existence of energy transferring unit, making different pressures grade form equivalent differential circuit becomes possibility, achieve the regeneration of energy, further enhance the energy-saving effect of system.
3) energy regenerating utilizes.Varying load servo energy-saving control system, adds energy storage oil circuit R, in energy recuperation mode stored energy, for other mode of operation fault offset, reduces the input of system.
4) full working scope covers.Present invention covers the various operating modes of load, moving direction change, all can reach energy-saving effect, applied range, full working scope covers.
Accompanying drawing explanation
The structural representation of Fig. 1 load force matching coupling of the present invention;
The schematic diagram of Fig. 2 varying load servo-control system of the present invention;
The controller function module map of Fig. 3 varying load servo-control system of the present invention;
The schematic diagram of Fig. 4 standard differential circuit of the present invention;
The schematic diagram of Fig. 5 the present invention equivalence differential circuit;
Fig. 6 standard energy of the present invention reclaims the schematic diagram in loop;
Fig. 7 equivalent energy of the present invention reclaims the schematic diagram in loop.
In figure: 1, switch valve, 2, motor, 3, metering pump, 4, individual event valve, 5, safety valve, 6, pump/motor, 7, clutch, 8, quantitatively pump/motor, 9, fuel tank, 10, pressure transducer, 11, accumulator, 12, low-pressure reservoir, 13, controller, 14, servovalve, 15, selector valve, 16, oil hydraulic cylinder, 17, displacement transducer.
Embodiment
Varying load servocontrol energy conserving system forms primarily of 4 oil circuits, is respectively the stored energy oil circuit R high-pressure oil passage H different with three pressure ratings, middle force feed road M, low pressure oil way T.In system, metering pump 3 is driven by motor 2, and quantitative delivery side of pump divides three oil circuits, is connected respectively with the filler opening of one-way valve 4, safety valve 5.1, switch valve 1; The oil outlet of safety valve 5.1, switch valve 1 directly and fuel tank 9 connect; The oil outlet of one-way valve 4 meets high-pressure oil passage H, and high-pressure oil passage H is connected with high pressure accumulator 11.2, pressure transducer 10.2, left and right two switch valve 1.4,1.7 filler opening, energy transferring unit switch valve 1.2 filler opening respectively; Middle force feed road M is connected with intermediate-pressure accumulator 11.3, pressure transducer 10.3, left and right two switch valve 1.5,1.8 filler opening, energy transferring unit switch valve 1.4 filler opening respectively; Low pressure oil way T is connected with low-pressure reservoir 12, left and right two switch valve 1.6,1.9 filler opening respectively; The direct connected tank of low-pressure reservoir 12 oil outlet; Stored energy oil circuit R is connected with storage accumulator 11.1, pressure transducer 10.1, safety valve 5.2 filler opening, energy transferring unit switch valve 1.3 filler opening respectively; Energy transferring unit switch valve 1.2,1.3,1.4 oil outlet connects pump/motor 6.1, pump/motor 6.2 and quantitative pump/motor 8 respectively; Pump/motor 6.1, pump/motor 6.2 and quantitative another hydraulic fluid port of pump/motor 8 directly take back fuel tank; Pump/motor 6.1, pump/motor 6.2 and quantitatively connect by clutch 7.1,7.2 between pump/motor 8; Left-wing Federation's switch valve 1.4,1.5,1.6 oil outlet collects and connects servovalve 14 filler opening; Servovalve 14 oil outlet connects two position and four-way reversing valve 15 filler openings; Right switch valve 1.7,1.8,1.9 oil outlet collects connection two position and four-way reversing valve 15 filler opening; The rodless cavity of two position and four-way reversing valve 15 oil outlets difference connecting fluid cylinder pressures and rod chamber, the rodless cavity of oil hydraulic cylinder and rod chamber connect pressure transducer 10.4,10.5 respectively, piston rod connection bit displacement sensor 17; Controller respectively with pressure transducer 10.1,10.2,10.3,10.4,10.5, displacement transducer 17, switch valve 1.1,1.2,1.3,1.4,1.5,1.6,1.7,1.8,1.9, servovalve 14, selector valve 15, pump/motor 6.1,6.2 be electrically connected.
Working principle of the present invention is as follows:
As shown in Figure 2, input displacement signal is passed to controller, and pressure transducer 10.4,10.5 detects the pressure in oil hydraulic cylinder two chamber in real time, and displacement transducer 17 detects the displacement of piston rod in real time, and controller is according to the direction of piston rod movement and load force F
l=p
aa
1-p
ba
2size, direction, select the combination of suitable pressure rating, make the exportable power F=p of oil hydraulic cylinder
1a
1-p
2a
2with F
ldifference Δ F
min=F-F
lminimum, be reduced in the restriction loss on discharge opeing servovalve 14.For system as shown in Figure 2, according to the direction of the combination of different pressure ratings, load force and motion, general mode, differential mode and energy recuperation mode three kinds of mode of operations can be divided into.In working procedure, oil hydraulic cylinder oil outlet meets pressure rating T through servovalve, is defined as general mode; Hydraulic cylinder direction is contrary with load force direction, and oil outlet meets non-pressure grade T through servovalve, is defined as differential mode; Whether equally press the pressure rating connected in oil hydraulic cylinder two chamber, be divided into again standard differential mode and equivalent differential mode.Pressure rating is equal, be then standard differential mode, otherwise is equivalent differential mode, respectively as shown in Figure 3, Figure 4.Hydraulic cylinder direction and load force direction together, are defined as energy recuperation mode.Whether be T by oil hydraulic cylinder two chamber inlet pressure grade, be divided into again standard energy take-back model and differential energy take-back model.Inlet pressure grade is T, be then energy recuperation mode, otherwise is differential energy take-back model, respectively as shown in Figure 5, Figure 6.Controller 13 is according to residing mode of operation, respectively energy transferring unit, energy storage oil circuit R, metering pump, unloading valve are regulated, each pressure rating of rational allocation, make each pressure rating keep constant voltage, under the prerequisite ensureing control characteristic, reduce the power loss of system.
Concrete operation step is as follows:
When controller 13 is by judging, when identification system is in normal mode of operation, it is system dynamic source that oil hydraulic cylinder in-line connects high-pressure oil passage H or middle force feed road M, high-pressure oil passage H or middle force feed road M.When power source oil circuit is high-pressure oil passage H, first starting energy storage oil circuit R is that high-pressure oil passage H supplements fluid, and switch valve 1.3,1.2 is opened, and clutch 7.1 is fitted, 7.2 separation, and pump/motor 6.1 immobilizes after setting up discharge capacity.Controller 13 adjusts pump/motor 6.2 discharge capacity in real time according to pressure transducer 10.1,10.2 feedback signal, makes rotatingshaft balance, maintains high-pressure oil passage H constant voltage.After energy storage oil circuit R Pressure Drop is low to moderate the setting lowest limit, switch valve 1.2,1.3 disconnects, and clutch 7.1,7.2 is separated, and energy storage oil circuit R quits work, and changes by metering pump 3 as high-pressure oil passage H supplements fluid.Controller 13 completes fluid infusion task by the break-make of control switch valve 1.1.When power source oil circuit is middle force feed road M, also taking the lead in starting energy storage oil circuit R is that middle force feed road M supplements fluid, and switch valve 1.3,1.4 is opened, and clutch 7.1 is separated, 7.2 laminatings.Controller 13 adjusts pump/motor 6.2 discharge capacity in real time according to pressure transducer 10.1,10.3 feedback signal, makes rotatingshaft balance, force feed road M constant voltage in maintenance.After energy storage oil circuit R Pressure Drop is low to moderate the setting lowest limit, switch valve 1.3 disconnects, and energy storage oil circuit R quits work, and changes and supplements fluid by metering pump 3 for middle force feed road M.Switch valve 1.2,1.4 is opened, immobilize after the adjustment of pump/motor 6.1 discharge capacity, pump/motor 6.2 discharge capacity is adjusted to zero, and controller 13 monitoring pressure sensor 10.2,10.3 feedback signal, completes the fluid infusion task of middle force feed road M by the break-make of control switch valve 1.1.
When controller 13 is by judging, identification system be in standard deviation start building operation mode time, high-pressure oil passage H or middle force feed road M devotes oneself to work, and system is its supplementary fluid.When controller 13 identifies that high-pressure oil passage H is working oil path, first starting energy storage oil circuit R is that high-pressure oil passage H supplements fluid, and switch valve 1.2,1.3 is opened, and clutch 7.1 is fitted, 7.2 separation, and pump/motor 6.1 immobilizes after setting up discharge capacity.Controller 13 adjusts pump/motor 6.2 discharge capacity in real time according to pressure transducer 10.1,10.2 feedback signal, maintains high-pressure oil passage H constant voltage.After energy storage oil circuit R Pressure Drop is low to moderate the setting lowest limit, switch valve 1.2,1.3 disconnects, and clutch 7.1,7.2 is separated, and energy storage oil circuit R quits work, and changes by metering pump 3 as high-pressure oil passage H supplements fluid.Controller 13 completes fluid infusion task by the break-make of control switch valve 1.1.When during controller 13 identifies, force feed road M is working oil path, also taking the lead in starting energy storage oil circuit R is that middle force feed road M supplements fluid, and switch valve 1.3,1.4 is opened, and clutch 7.2 is fitted.Controller 13 adjusts pump/motor 6.2 discharge capacity in real time according to pressure transducer 10.1,10.3 feedback signal, force feed road M constant voltage in maintenance.After energy storage oil circuit R Pressure Drop is low to moderate the setting lowest limit, switch valve 1.3 disconnects, and energy storage oil circuit R quits work, and changes and supplements fluid by metering pump 3 for middle force feed road M.Switch valve 1.2,1.4 is opened, the adjustment of pump/motor 6.1 discharge capacity immobilizes, pump/motor 6.2 discharge capacity is adjusted to zero, and controller 13 monitoring pressure sensor 10.2,10.3 feedback signal, completes the fluid infusion task of middle force feed road M by the break-make of control switch valve 1.1.
When controller 13 is by judging, when identification system is in equivalent differential mode of operation, high-pressure oil passage H and middle force feed road M devotes oneself to work, and system is its supplementary fluid.When controller 13 judges that high-pressure oil passage H is power oil-duct, first starting energy storage oil circuit R is that high-pressure oil passage H supplements fluid, and switch valve 1.2,1.3,1.4 is opened, and clutch 7.1,7.2 is fitted, and pump/motor 6.1 immobilizes after setting up discharge capacity.Controller 13 adjusts pump/motor 6.2 discharge capacity in real time according to pressure transducer 10.1,10.2 feedback signal, makes rotatingshaft balance, maintains high-pressure oil passage H constant voltage.After energy storage oil circuit R Pressure Drop is low to moderate the setting lowest limit, switch valve 1.3 disconnects, and pump/motor 6.2 discharge capacity is adjusted to zero, and energy storage oil circuit R quits work, and changes by metering pump 3 as high-pressure oil passage H supplements fluid.Controller 13 completes fluid infusion task by the break-make of control switch valve 1.1.When during controller 13 judges, force feed road M is power oil-duct, also taking the lead in starting energy storage oil circuit R is that middle force feed road M supplements fluid, and switch valve 1.2,1.3,1.4 is opened, and clutch 7.1,7.2 is fitted.Controller 13 adjusts pump/motor 6.2 discharge capacity in real time according to pressure transducer 10.1,10.3 feedback signal, makes rotatingshaft balance, force feed road M constant voltage in maintenance.After energy storage oil circuit R Pressure Drop is low to moderate the setting lowest limit, switch valve 1.3 disconnects, and pump/motor 6.2 discharge capacity is adjusted to zero, and energy storage oil circuit R quits work, and changes and supplements fluid by metering pump 3 for middle force feed road M.Switch valve 1.2,1.4 is opened, and clutch 7.1,7.2 is fitted, and the adjustment of pump/motor 6.1 discharge capacity immobilizes, and controller 13 monitoring pressure sensor 10.2,10.3 feedback signal, completes the fluid infusion task of middle force feed road M by the break-make of control switch valve 1.1.
When controller 13 is by judging, when identification system is in standard energy recovery operation pattern, high-pressure oil passage H or middle force feed road M connects oil-discharging cavity, its energy of system recoveries.When controller 13 judges that high-pressure oil passage H is oil extraction, start energy storage oil circuit R stored energy, switch valve 1.2,1.3 is opened, and clutch 7.1 is fitted, 7.2 separation, and pump/motor 6.1 immobilizes after setting up discharge capacity.Controller 13 adjusts pump/motor 6.2 discharge capacity in real time according to pressure transducer 10.1,10.2 feedback signal, makes rotatingshaft balance, absorbs high-pressure oil passage H energy.When during controller 13 judges, force feed road M is oil extraction, start energy storage oil circuit R stored energy, switch valve 1.3,1.4 is opened, and clutch 7.1 is separated, 7.2 laminatings.Controller 13 adjusts pump/motor 6.2 discharge capacity in real time according to pressure transducer 10.1,10.3 feedback signal, makes rotatingshaft balance, force feed road M energy in absorption.
When controller 13 is by judging, when identification system is in differential energy recovery operation pattern, start energy storage oil circuit R stored energy, switch valve 1.2,1.3,1.4 is opened, and clutch 7.1,7.2 is fitted, and pump/motor 6.1 immobilizes after setting up discharge capacity.Controller 13 adjusts pump/motor 6.2 discharge capacity in real time according to pressure transducer 10.1,10.2,10.3 feedback signal, makes rotatingshaft balance, absorbs the energy from high-pressure oil passage H or middle force feed road M.
Technological scheme of the present invention is not limited to described mode of execution, if other people design has a little different from institute's partial pressure rate range in the present invention, or pressure rating number is different, should not be considered as and the present invention's difference to some extent.
Claims (3)
1. the energy-saving design method of a varying load servo-control system, varying load servocontrol energy conserving system involved by energy-saving design method is made up of switch valve, motor, metering pump, one-way valve, safety valve, quantitative pump/motor, clutch, pump/motor, pressure transducer, accumulator, controller, servovalve, selector valve, oil hydraulic cylinder, low-pressure reservoir and fuel tank, it is characterized in that: varying load servocontrol energy conserving system comprises 4 oil circuits, be respectively the stored energy oil circuit R high-pressure oil passage H different with three pressure ratings, middle force feed road M, low pressure oil way T; In system, metering pump is by driven by motor, and oil circuit is divided into three oil circuits in parallel at pumping hole: a connecting valve valve, plays pumping source Unloading Effect; , a connection safety valve, plays safety effect; Article one, after pumping hole one-way valve, be connected to system high pressure oil circuit H, as working oil path, high-pressure oil passage H connects four points of oil circuits again respectively, wherein one connects high pressure accumulator H, play [constant effect, and be connected to pressure transducer, gather pressure signal and feed back to controller; A link variable pump/motor after switch valve, logical oil sump tank, as a part for energy transferring unit; Remain two oil circuits be connected to left and right two switch valves in one, as the high-pressure oil passage leading to final controlling element; Middle force feed road M connects four points of oil circuits respectively, and wherein one connects intermediate-pressure accumulator M, plays [constant effect, and is connected to pressure transducer, gathers pressure signal and feeds back to controller; One connects quantitative pump/motor after switch valve, and logical oil sump tank, as a part for energy transferring unit; Remain two oil circuits be connected to left and right two switch valves in one, as leading to force feed road in final controlling element; Low pressure oil way T connects three points of oil circuits, two be connected to left and right two switch valves in one, as the low pressure oil way leading to final controlling element, remain one connection low-pressure reservoir after oil sump tank; Stored energy oil circuit R connects three points of oil circuits, and wherein one connects energy storage accumulator R, plays energy storage effect, and is connected to pressure transducer, gathers pressure signal and feeds back to controller; One after switch valve link variable pump/motor and fuel tank connect, and to be connected, as a part for energy transferring unit with quantitative pump/motor that is high, middle force feed road respectively by clutch; Remain an oil circuit connection safety valve, play safety protection effect; Oil circuit is after the switch valve of left and right two, Left-wing Federation's switch valve connects a hydraulic fluid port of two position and four-way reversing valves after servovalve, right switch valve then directly connects another hydraulic fluid port of two position and four-way reversing valves, two position and four-way reversing valve oil outlets respectively connecting fluid cylinder pressures into and out of hydraulic fluid port, oil hydraulic cylinder two chamber is connected to pressure transducer respectively, gathers pressure signal and feeds back to controller; Hydraulic cylinder piston rod is connected to displacement transducer, gather displacement signal and feed back to controller, the input signal of controller is the displacement signal that the pressure signal that gathers of each pressure transducer and displacement transducer gather, output signal the make-and-break signal for controlling each switch valve, selector valve commutation signal, control the electrical signal of servovalve valve port opening and pump/motor.
2. the energy-saving design method of varying load servo-control system according to claim 1, is characterized in that: described controller is PC process control machine or programmable controller.
3. the energy-saving design method of varying load servo-control system according to claim 1, is characterized in that: the constant voltage oil circuit and the accumulation of energy oil circuit R that arrange H, M, T tri-pressure ratings in system, without spill losses, only there is the off-load loss of metering pump; By any combination of two of oil hydraulic cylinder into and out of oil circuit high, medium and low different pressures grade, draw 9 kinds of ouput forces varied in size at the most, controller controls the transfer sequence of different pressures grade combination flexibly, oil hydraulic cylinder ouput force is mated with load force matching to greatest extent, reduces the restriction loss of servovalve valve port; Each pressure rating oil circuit except T oil circuit is communicated with energy storage oil circuit R through energy transferring unit, controller is according to feedback signal, efficiently, each switch valve of conservative control, pump/motor, effectively the constant voltage oil circuit of management three pressure ratings and energy storage oil circuit R, realize transmission and the energy storage of energy.
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