CN104564854A - Multi-executer heavy load digital hydraulic loop based on high-voltage common rail cabin - Google Patents
Multi-executer heavy load digital hydraulic loop based on high-voltage common rail cabin Download PDFInfo
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- CN104564854A CN104564854A CN201410829698.8A CN201410829698A CN104564854A CN 104564854 A CN104564854 A CN 104564854A CN 201410829698 A CN201410829698 A CN 201410829698A CN 104564854 A CN104564854 A CN 104564854A
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- 230000001276 controlling effect Effects 0.000 claims abstract description 60
- 239000012530 fluid Substances 0.000 claims abstract description 49
- 239000002828 fuel tank Substances 0.000 claims description 30
- 239000000945 filler Substances 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 11
- 230000001702 transmitter Effects 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 6
- 230000000875 corresponding Effects 0.000 abstract 3
- 239000003921 oil Substances 0.000 description 28
- 238000005516 engineering process Methods 0.000 description 6
- 210000001367 Arteries Anatomy 0.000 description 4
- 210000003462 Veins Anatomy 0.000 description 4
- 230000000051 modifying Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000003292 diminished Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000004575 stone 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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/25—Pressure control functions
Abstract
The invention relates to the field of fluid drive and control, and aims at providing a multi-executer heavy load digital hydraulic loop based on a high-voltage common rail cabin. The multi-executer heavy load digital hydraulic loop based on the high-voltage common rail cabin comprises an oil supply system, high-speed switch valve groups, an electronic control unit and executers, wherein the oil supply system comprises an engine, a valve flow distributing plunger pump, a high-pressure cabin, a rotation speed and rotation angle sensor, a temperature sensor, a pressure sensor, a pilot proportional overflow valve, an energy accumulator and a safety valve, and each high-speed switch valve group is arranged on an oil port of the corresponding executer, and is used for respectively controlling the connection and disconnection between the corresponding executer and the high-pressure cabin, and between the corresponding executer and an oil tank through the electronic control unit. The multi-executer heavy load digital hydraulic loop has the advantages that by combining the high-pressure common rail method and the digital hydraulic technique, the working pressure of the hydraulic system is improved, and the advantage of high power density of hydraulic drive is further developed; by using the high-speed switch valves as the unique control valves, the hydraulic system is simple, the control is easy, and the system efficiency is improved.
Description
Technical field
The invention relates to mechanical, electrical, that liquid control technique is feature Fluid Transmission and Control field, particularly based on the multi executors heavy duty digital hydraulic loop in high-pressure common rail cabin.
Background technique
The simulated solution pressing system that the many employings of existing engineering machinery are traditional, utilize pump open circuit, multiple final controlling element is controlled by a pump, controlled the action of final controlling element by load-sensitive valve, Proportional valve etc. between pump and final controlling element, because the working pressure of system is generally between 25-35MPa, cause the size of final controlling element can not be too little, therefore cause the size of whole system can not be too little, further cannot reduce the physical dimension of complete machine.
In engineering machinery, the design utilizing digital hydraulic technology to carry out oil hydraulic circuit is also in conceptual phase at present, 2010, on wheel loader, traditional load sensitive system is substituted with the digital hydraulic loop that high-speed switch valve forms by scholar, found by simulation study, the system after improvement can reduce the energy ezpenditure of 33-63%.Engineering machinery has the feature of heavy duty and multi executors, if the demand of flow system flow can be reduced by the pressure improving hydraulic system and then improve the power density ratio of hydraulic element, then significantly can reduce the size of final controlling element, thus also make the overall dimensions of engineering machinery become compact.
High-pressure common rail is the high pressure oil accumulation of high pressure oil pump being carried with the common rail cabin with larger volume, and utilizes electronic control unit, pressure transducer, and pressure regulator valve etc. realize accurate Stress control.At present, high-pressure common rail is mainly used in diesel engine high-pressure common rail fuel oil electric injection system, its common rail pressure can reach 200MPa, main purpose is separated completely jet pressure and course of injection, high pressure oil pressure and engine speed are had nothing to do, regulate fuel injection amount controlling high-speed switch valve by electronic control unit, improve fuel efficiency.
Along with popularizing of digital hydraulic, the digital hydraulic loop be made up of high-speed switch valve receives increasing concern, because high-speed switch valve can realize independent control to filler opening and return opening, thus speed and Bit andits control can be realized more accurately, and there is no chock pressure difference due to high-speed switch valve, be thus higher than from the efficiency in efficiency digital hydraulic loop the oil hydraulic circuit be made up of traditional servovalve and Proportional valve.But when requiring the through-current capability of high-speed switch valve larger, response time of its switch is often comparatively slow again, the high and high-speed switch valve that flow the is large difficult problem often of production frequency response.But if reduce the requirement to high-speed switch valve through-current capability, then it can reach very high frequency response, and its switching response time can reach Millisecond, so the development trend of high-speed switch valve is small flow high frequency sound valve.Frequency response its control performance higher of high-speed switch valve is better, the method of normal employing pulsewidth modulation controls high-speed switch valve, but require too high to the frequency response of valve due to pulsewidth modulation, therefore more feasible way adopts pulse number modulation, namely the high-speed switch valve group of a large discharge is formed with the high-speed switch valve of a lot of small flow high frequency sounds, its flow passed through is controlled by the number opened and close controlling a valve group medium-small flow switch valve, this reduces the requirement to high-speed switch valve frequency response, simultaneously because the high-speed switch valve of small flow high frequency sound is following developing direction, by the method for arteries and veins numerical control high-speed switch valve group, there is very large market using value.
Summary of the invention
Main purpose of the present invention is to overcome deficiency of the prior art, provides a kind of working pressure that further can improve hydraulic system, improves the heavy duty of the multi executors based on the high-pressure common rail cabin digital hydraulic loop of the power density ratio of hydraulic element.For solving the problems of the technologies described above, solution of the present invention is:
Multi executors heavy duty digital hydraulic loop based on high-pressure common rail cabin is provided, comprise oil supply system, high-speed switch valve group, electronic control unit and final controlling element, described oil supply system comprises motor, Flat valve plunger pump, hyperbaric chamber, rotating speed rotary angle transmitter, temperature transducer, pressure transducer, guide proportion relief valve, accumulator and safety valve; Described motor is used for actuating valve assigning plunger pump, and the oil outlet of Flat valve plunger pump is connected with the filler opening of hyperbaric chamber, and the return opening of guide proportion relief valve is connected with fuel tank A, and the inlet port of Flat valve plunger pump, oil-suction oil filter, fuel tank A connect successively; The return opening of hyperbaric chamber is connected with the filler opening of safety valve, and the return opening of safety valve is connected with fuel tank B; Connecting pipeline between Flat valve plunger pump and hyperbaric chamber is provided with guide proportion relief valve, temperature transducer, pressure transducer, accumulator, and the control signal line of temperature transducer, pressure transducer, guide proportion relief valve, safety valve, rotating speed rotary angle transmitter is connected with electronic control unit respectively;
Described Flat valve plunger pump is used for fluid pumping to enter in hyperbaric chamber, obtains stable high-voltage oil liquid (pressure is at more than 60MPa); Rotating speed rotary angle transmitter is arranged in the rotating shaft of Flat valve plunger pump, for obtaining rotating speed, the corner information of Flat valve plunger pump, and the rotating speed of acquisition, corner information input electronic control unit is monitored; Described temperature transducer, pressure transducer are respectively used to the temperature, the pressure that obtain fluid in pipeline, and the temperature of acquisition, pressure information input electronic control unit are monitored; Described electronic control unit, by controlling guide proportion relief valve, regulates the pressure of hyperbaric chamber inner fluid; Described accumulator is for ensureing that the pressure of hyperbaric chamber inner fluid fluctuates within positive and negative 5% of guide's proportional pressure control valve setting pressure; Described safety valve, for limiting the maximum pressure of hyperbaric chamber inner fluid, prevents hyperbaric chamber inner fluid pressure from declining rapidly suddenly simultaneously;
Described high-speed switch valve group arranges on the hydraulic fluid port of final controlling element, is respectively used to control final controlling element and hyperbaric chamber, the break-make of fluid between final controlling element and fuel tank; Described high-speed switch valve group comprises the small flow high frequency sound high-speed switch valve of at least four parallel joins, and each high-speed switch valve group respectively by connection to electronic control unit, the number that electronic control unit is opened by controlling small flow high frequency sound high-speed switch valve, realize the control to the fluid flow by high-speed switch valve group, and then control the action of final controlling element.
In the present invention, described electronic control unit comprises display device and programmable PLC.
In the present invention, described safety valve adopts unloading overflow valve, and its unloading function is controlled by electronic control unit.
In the present invention, described small flow high frequency sound high-speed switch valve adopts two position two-way valve, and rated flow is within the scope of 1 ~ 5L/min.
In the present invention, described motor adopts diesel engine.
In the present invention, described final controlling element comprises the final controlling element of bidirectional-movement, the final controlling element of unidirectional movement;
Two hydraulic fluid ports of the final controlling element of described bidirectional-movement are connected to two groups of high-speed switch valve groups, and two groups of high-speed switch valve groups that each hydraulic fluid port connects, one group of high-speed switch valve group is connected with hyperbaric chamber, another group high-speed switch valve group is connected with fuel tank, and namely each hydraulic fluid port is provided with the high-speed switch valve that the high-speed switch valve that is connected with hyperbaric chamber is connected with fuel tank;
Two hydraulic fluid ports of the final controlling element of described unidirectional movement are respectively filler opening and return opening, and filler opening is connected with hyperbaric chamber by a high-speed switch valve group, and return opening is connected with fuel tank by a high-speed switch valve group.
In the present invention, the final controlling element of described bidirectional-movement comprises single pole double-acting hydraulic cylinder, two-way quantitative motor, and the final controlling element of unidirectional movement comprises unidirectional fixed displacement motor.
Working principle of the present invention: the high-voltage oil liquid that hyperbaric chamber is accumulated is transported to each final controlling element by high-speed switch valve group, what each final controlling element was same simultaneously flows back to fuel tank by high-speed switch valve group by fluid; Whole hydraulic system is controlled by an electronic control unit (ECU), the moving law expected by input load and monitoring system Operational Limits, control the number that each high-speed switch valve group medium-small flow high-speed switch valve is opened simultaneously, and then the motion of control load.
Compared with prior art, the invention has the beneficial effects as follows:
1, the present invention improves the working pressure of hydraulic system by high-pressure common rail method, thus the flow required for reduction final controlling element lays the foundation, and further improves the power density ratio of hydraulic element, makes whole system become more compact.Traditional hydraulic system general work is in below 35MPa.And the method for the employing high-pressure common rail that the present invention proposes, utilize the plunger pump of Flat valve can the pressure oil liquid of pumping at least 60MPa, and utilize the hyperbaric chamber accumulation that a volume is larger, set pressure is carried out by pilot-operated proportional relief valve and accumulator, adopt the method for high-pressure common rail, when system stability is at a certain pressure, motor only needs to consume little energy and rotates just with holding pump.
2, utilize digital hydraulic technology to control the motion of final controlling element and load, instead of controlled by traditional servovalve or Proportional valve.Owing to adopting high-speed switch valve to control, there is no throttling loss, thus improve efficiency, improve the controllability of system simultaneously.
3, general digital hydraulic loop selects the method for pulsewidth modulation to control, and not only require very high to the frequency response of valve, and volume produces pressure surge.The present invention adopts several small flow high frequency sound high-speed switch valve to form a high-speed switch valve group, the fluid amount by this valve group is controlled by the number controlling the small flow high-speed switch valve opened in a valve group simultaneously, not only reduce the requirement to valve frequency response like this, also reduce pressure surge simultaneously.
4, traditional engineering machinery, farm machinery many employings load sensing control technique, hydraulic system is not only complicated, and efficiency is low.High-pressure common rail method and digital hydraulic technology combine by the present invention, not only increase the working pressure of hydraulic system, further play the large advantage of hydraulic transmission specific power, and utilizing high-speed switch valve to make hydraulic system simple and easy to control as unique control valve, the efficiency of simultaneity factor is also improved.
Accompanying drawing explanation
The hydraulic system principle figure that Fig. 1 is.
Reference character in figure is: 1 fuel tank A; 2 oil-suction oil filters; 3 diesel engine; 4 Flat valve plunger pumps; 5 guide proportion relief valves; 6 temperature transducers; 7 pressure transducers; 8 rotating speed rotary angle transmitters; 9 accumulators; 10 electronic control units; 11 hyperbaric chambers; 12 safety valves; 13 fuel tank B; 14 unidirectional fixed displacement motors; 15 two-way quantitative motors; 16 single pole double-acting hydraulic cylinders; 17 other final controlling element; 18.1-18.10 high-speed switch valve group; 19.1-19.4 small flow high frequency sound high-speed switch valve.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail:
The heavy duty of the multi executors based on high-pressure common rail cabin digital hydraulic loop as shown in Figure 1, comprises oil supply system, high-speed switch valve group, electronic control unit 10 and final controlling element.By high-pressure common rail method and digital hydraulic circuit technology being integrated together: the high-voltage oil liquid accumulated by hyperbaric chamber 11 is transported to each final controlling element by high-speed switch valve group, what each final controlling element was same simultaneously flows back to fuel tank by high-speed switch valve group by fluid; Whole hydraulic system is controlled by an electronic control unit 10 (ECU), the moving law expected by input load and monitoring system Operational Limits, control the number that each high-speed switch valve group medium-small flow high-speed switch valve is opened simultaneously, and then the motion of control load.
Oil supply system comprises diesel engine 3, Flat valve plunger pump 4, hyperbaric chamber 11, rotating speed rotary angle transmitter 8, temperature transducer 6, pressure transducer 7, guide proportion relief valve 5, accumulator 9 and safety valve 12; Oil supply system have employed diesel engine electric spray technique mesohigh common rail method, can produce the stable high-voltage oil liquid of pressure at more than 60MPa, and during pressure stability, motor only keeps pump to operate with consuming little power.
Diesel engine 3 be used for actuating valve assigning plunger pump 4, Flat valve plunger pump 4 oil outlet be connected with the filler opening of hyperbaric chamber 11, the return opening of guide proportion relief valve 5 is connected to fuel tank A1, the inlet port of Flat valve plunger pump 4, oil-suction oil filter 2, fuel tank A1 connect successively, the return opening of hyperbaric chamber 11 is connected with the filler opening of safety valve 12, and the filler opening of safety valve 12 is connected with fuel tank B13; Connecting pipeline between Flat valve plunger pump 4 and hyperbaric chamber 11 is provided with guide proportion relief valve 5, temperature transducer 6, pressure transducer 7, accumulator 9, and the control signal line of temperature transducer 6, pressure transducer 7, guide proportion relief valve 5, safety valve 12, rotating speed rotary angle transmitter 8 is connected to electronic control unit 10.
Utilize Flat valve plunger pump 4 high-voltage oil liquid (pressure is at more than 60MPa) pumping to be entered in the larger hyperbaric chamber of volume 11, be similar to common rail cabin.Described electronic control unit 10 is by controlling guide proportion relief valve 5, system pressure is set up by pilot-operated proportional relief valve 5, and utilize accumulator 9 that hyperbaric chamber 11 pressure is fluctuated in very little scope, limit the safety pressure of hyperbaric chamber 11 by safety valve 12 and prevent hyperbaric chamber 11 pressure from reducing suddenly.Rotating speed rotary angle transmitter 8 is arranged in the rotating shaft of Flat valve plunger pump 4, for obtaining rotating speed, the corner information of Flat valve plunger pump 4, and the rotating speed of acquisition, corner information input electronic control unit 10 is monitored.Temperature transducer 6, pressure transducer 7 are respectively used to the temperature, the pressure that obtain fluid in pipeline, and the temperature of acquisition, pressure information input electronic control unit 10 are monitored.Safety valve 12 adopts unloading overflow valve, and its unloading function is controlled by electronic control unit 10.Oil supply system by the method for high-pressure common rail for hydraulic system provides a stable high-voltage oil liquid source, for the power density ratio improving actuator element lays the first stone.
High-speed switch valve group arranges on the hydraulic fluid port of final controlling element, is respectively used to control final controlling element and hyperbaric chamber 11, the break-make of fluid between final controlling element and fuel tank, is raised the efficiency by digital hydraulic technology.High-speed switch valve group comprises the identical small flow high frequency sound high-speed switch valve of at least four (determining according to loading demand) parallel joins, the rated flow of the high-speed switch valve of these small flow high frequency sounds is in the scope of 1-5L/min, because rated flow is very little, the switching response time of high-speed switch valve can reach Millisecond; And small flow high frequency sound high-speed switch valve has the response time soon, the features such as high pressure resistant and through-current capability is little.Each high-speed switch valve group respectively by connection to electronic control unit 10, electronic control unit 10 is by the method for arteries and veins numerical control, namely the number controlling the small flow high frequency sound high-speed switch valve of opening simultaneously or closing in high-speed switch valve group controls the fluid amount passed through, and then the speed of control load, rotating speed, power or moment.Small flow high frequency sound high-speed switch valve adopts two position two-way valve.
This hydraulic system is specially adapted to multi executors loop, and final controlling element comprises the final controlling element of bidirectional-movement, the final controlling element of unidirectional movement; The final controlling element of bidirectional-movement comprises single pole double-acting hydraulic cylinder 16, two-way quantitative motor 15, and the final controlling element of unidirectional movement comprises unidirectional fixed displacement motor 14.In addition, the switching process due to high-speed switch valve does not have throttling loss, so the hydraulic system that system contrasts traditional servovalve and Proportional valve composition has higher efficiency.
Two hydraulic fluid ports of the final controlling element of bidirectional-movement are connected to two groups of high-speed switch valve groups, and two groups of high-speed switch valve groups that each hydraulic fluid port connects, one group of high-speed switch valve group is connected with hyperbaric chamber 11, another group high-speed switch valve group is connected with fuel tank, and namely each hydraulic fluid port is provided with the high-speed switch valve that the high-speed switch valve that is connected with hyperbaric chamber 11 is connected with fuel tank.Such as the rod chamber of single pole double-acting hydraulic cylinder 16 is connected with high-speed switch valve group 18.1 and high-speed switch valve group 18.2 respectively, high-speed switch valve group 18.1 is connected with fuel tank A1 again, control the break-make of fluid between rod chamber and fuel tank A1, high-speed switch valve group 18.2 is connected with hyperbaric chamber 11 again, is responsible for the break-make of fluid between rod chamber and hyperbaric chamber 11; The rodless cavity of single pole double-acting hydraulic cylinder 16 is connected with high-speed switch valve group 18.3 and high-speed switch valve group 18.4 respectively, is responsible for the break-make of fluid between rodless cavity and hyperbaric chamber 11 respectively, the break-make of fluid between rodless cavity and fuel tank A1.All valve groups are all controlled by electronic control unit 10, as needs hydraulic cylinder piston rods increases ouput force to left movement, then need to require to control the n (n=3 in high-speed switch valve group 18.3 according to loading speed, 4, ) individual small flow high frequency sound high-speed switch valve 19 opens, need m the small flow high frequency sound high-speed switch valve 19 opened in high-speed switch valve group 18.1 to open simultaneously, wherein n>m must be met, like this ouput force could be increased, when needs pace of change or when changing ouput force, only need the numerical value being changed n and m by electronic control unit 10, namely desirable speed or power curve of output can be obtained.Move right to piston rod, at this moment the number controlling the small flow high frequency sound high-speed switch valve 19 opened in high-speed switch valve group 18.2 and high-speed switch valve group 18.4 is needed, by changing the size of number, same also can reach required loading speed or power curve of output.For two-way quantitative motor 15, its controlling method is similar to single pole double-acting hydraulic cylinder 16.
Two hydraulic fluid ports of the final controlling element of unidirectional movement are respectively filler opening and return opening, and filler opening is connected with hyperbaric chamber 11 by a high-speed switch valve group, and return opening is connected with fuel tank A1 by a high-speed switch valve group.The filler opening of such as unidirectional fixed displacement motor 14 is connected with hyperbaric chamber 11 by a high-speed switch valve group 18.9, control the break-make of fluid between itself and hyperbaric chamber 11, the return opening of unidirectional fixed displacement motor 14 is connected with fuel tank A1 by another high-speed switch valve group 18.10, controls the break-make of fluid between itself and fuel tank A1.By controlling the number of the small flow high frequency sound high-speed switch valve 19 opened in high-speed switch valve group 18.9 and high-speed switch valve group 18.10, regulate the pressure reduction between unidirectional fixed displacement motor 14 filler opening and return opening, thus the output torque of motor is changed, change the number of the small flow high frequency sound high-speed switch valve 19 opened of filler opening simultaneously, have also been changed the input flow rate of unidirectional fixed displacement motor 14, its rotating speed is changed.Therefore by changing the number of the small flow high frequency sound high-speed switch valve 19 opened in high-speed switch valve group 18.9 and high-speed switch valve group 18.10, rotating speed and the torque of unidirectional fixed displacement motor 14 can be changed, make it change according to the demand of load.
In addition, electronic control unit 10 can adopt display device to add programmable PLC to form.
In sum, high-pressure common rail method and digital hydraulic technology combine by the present invention, not only increase the pressure (more than 60MP) of hydraulic system, improve the power density ratio of hydraulic element, make whole hydraulic system more compact, improve the efficiency of system simultaneously.And by improving pressure, under the prerequisite exporting equal-wattage, the flow required for load is diminished, thus the high-speed switch valve group enabling the high-speed switch valve of small flow high frequency sound form is applied in this type of oil hydraulic circuit, and due to the controllability that high-speed switch valve is good, can better control effects be reached.
The present invention is operationally:
First system boosting, reach the pressure of specifying: fluid is pumped into hyperbaric chamber 11 by Flat valve plunger pump 4, now high-speed switch valve group is all in normally off, the oil pressure relief of pilot-operated proportional relief valve 5 is set up specified pressure, along with increasing of hyperbaric chamber 11 fluid, oil liquid pressure rises gradually, observes pressure transducer 7 when reaching specified pressure, the fluid of pumping overflows from pilot-operated proportional relief valve 5, and now diesel engine 3 need consume small part energy holding pump low-speed running.Safety valve 12 is used for limiting the pressure maximum of hyperbaric chamber 11 fluid, and simultaneously when oil liquid pressure declines suddenly (leakage has appearred in high pressure oil pipeline or hyperbaric chamber 11), electronic control unit 10 can control safety valve 12 and open in time and carry out off-load.Rotating speed rotary angle transmitter 8, temperature transducer 6 etc. is used for monitoring the parameter that hydraulic system is run, to be used for carrying out the assessment of efficiency.
Each high-speed switch valve group is made up of several small flow high frequency sound high-speed switch valve 19, and concrete quantity will according under actual conditions, and the maximum functional flow required for load is determined.Each small flow high frequency sound high-speed switch valve 19 can reach very high frequency response, its switching time can again within 1ms, therefore its control performance is superior, be together in parallel several small flow high frequency sound high-speed switch valve 19 composition high-speed switch valve group, just be equivalent to the high-speed switch valve of a large discharge, and regulate the flow flowing into or flow out high-speed switch valve group due to the number adopting the method for arteries and veins numerical control namely to control the small flow high frequency sound high-speed switch valve 19 opened simultaneously, thus high-speed switch valve group not only has larger flow also has higher switching speed concurrently simultaneously, and traditional high-speed switch valve does not often reach the switching speed of Millisecond when large discharge, therefore adopt in this way: namely utilize the small flow high-speed switch valve of several parallel connection to form a large discharge high-speed switch valve, and utilize the method for arteries and veins numerical control, not only just can obtain one to be equivalent to there is large discharge and to respond but also fast high-speed switch valve simultaneously.
Finally, it should be noted that above what enumerate is only specific embodiments of the invention.Obviously, the invention is not restricted to above embodiment, a lot of distortion can also be had.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention, all should think protection scope of the present invention.
Claims (7)
1. based on the multi executors heavy duty digital hydraulic loop in high-pressure common rail cabin, comprise oil supply system, high-speed switch valve group, electronic control unit and final controlling element, it is characterized in that, described oil supply system comprises motor, Flat valve plunger pump, hyperbaric chamber, rotating speed rotary angle transmitter, temperature transducer, pressure transducer, guide proportion relief valve, accumulator and safety valve; Described motor is used for actuating valve assigning plunger pump, and the oil outlet of Flat valve plunger pump is connected with the filler opening of hyperbaric chamber, and the return opening of guide proportion relief valve is connected with fuel tank A, and the inlet port of Flat valve plunger pump, oil-suction oil filter, fuel tank A connect successively; The return opening of hyperbaric chamber is connected with the filler opening of safety valve, and the return opening of safety valve is connected with fuel tank B; Connecting pipeline between Flat valve plunger pump and hyperbaric chamber is provided with guide proportion relief valve, temperature transducer, pressure transducer, accumulator, and the control signal line of temperature transducer, pressure transducer, guide proportion relief valve, safety valve, rotating speed rotary angle transmitter is connected with electronic control unit respectively;
Described Flat valve plunger pump is used for fluid pumping to enter in hyperbaric chamber, obtains stable high-voltage oil liquid; Rotating speed rotary angle transmitter is arranged in the rotating shaft of Flat valve plunger pump, for obtaining rotating speed, the corner information of Flat valve plunger pump, and the rotating speed of acquisition, corner information input electronic control unit is monitored; Described temperature transducer, pressure transducer are respectively used to the temperature, the pressure that obtain fluid in pipeline, and the temperature of acquisition, pressure information input electronic control unit are monitored; Described electronic control unit, by controlling guide proportion relief valve, regulates the pressure of hyperbaric chamber inner fluid; Described accumulator is for ensureing that the pressure of hyperbaric chamber inner fluid fluctuates within positive and negative 5% of guide's proportional pressure control valve setting pressure; Described safety valve, for limiting the maximum pressure of hyperbaric chamber inner fluid, prevents hyperbaric chamber inner fluid pressure from declining rapidly suddenly simultaneously;
Described high-speed switch valve group arranges on the hydraulic fluid port of final controlling element, is respectively used to control final controlling element and hyperbaric chamber, the break-make of fluid between final controlling element and fuel tank; Described high-speed switch valve group comprises the small flow high frequency sound high-speed switch valve of at least four parallel joins, and each high-speed switch valve group respectively by connection to electronic control unit, the number that electronic control unit is opened by controlling small flow high frequency sound high-speed switch valve, realize the control to the fluid flow by high-speed switch valve group, and then control the action of final controlling element.
2. the heavy duty of the multi executors based on high-pressure common rail cabin digital hydraulic loop according to claim 1, it is characterized in that, described electronic control unit comprises display device and programmable PLC.
3. the heavy duty of the multi executors based on high-pressure common rail cabin digital hydraulic loop according to claim 1, it is characterized in that, described safety valve adopts unloading overflow valve, and its unloading function is controlled by electronic control unit.
4. the heavy duty of the multi executors based on high-pressure common rail cabin digital hydraulic loop according to claim 1, it is characterized in that, described small flow high frequency sound high-speed switch valve adopts two position two-way valve, and rated flow is within the scope of 1 ~ 5L/min.
5. the heavy duty of the multi executors based on high-pressure common rail cabin digital hydraulic loop according to claim 1, it is characterized in that, described motor adopts diesel engine.
6. the heavy duty of the multi executors based on high-pressure common rail cabin digital hydraulic loop according to claim 1, it is characterized in that, described final controlling element comprises the final controlling element of bidirectional-movement, the final controlling element of unidirectional movement;
Two hydraulic fluid ports of the final controlling element of described bidirectional-movement are connected to two groups of high-speed switch valve groups, and two groups of high-speed switch valve groups that each hydraulic fluid port connects, one group of high-speed switch valve group is connected with hyperbaric chamber, another group high-speed switch valve group is connected with fuel tank, and namely each hydraulic fluid port is provided with the high-speed switch valve that the high-speed switch valve that is connected with hyperbaric chamber is connected with fuel tank;
Two hydraulic fluid ports of the final controlling element of described unidirectional movement are respectively filler opening and return opening, and filler opening is connected with hyperbaric chamber by a high-speed switch valve group, and return opening is connected with fuel tank by a high-speed switch valve group.
7. the heavy duty of the multi executors based on high-pressure common rail cabin digital hydraulic loop according to claim 6, it is characterized in that, the final controlling element of described bidirectional-movement comprises single pole double-acting hydraulic cylinder, two-way quantitative motor, and the final controlling element of unidirectional movement comprises unidirectional fixed displacement motor.
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| CN104564854B (en) | 2016-10-12 |
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