CN101412001B - Hydraulic spring automatic hydraulic load-variable device - Google Patents
Hydraulic spring automatic hydraulic load-variable device Download PDFInfo
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- CN101412001B CN101412001B CN2008102278707A CN200810227870A CN101412001B CN 101412001 B CN101412001 B CN 101412001B CN 2008102278707 A CN2008102278707 A CN 2008102278707A CN 200810227870 A CN200810227870 A CN 200810227870A CN 101412001 B CN101412001 B CN 101412001B
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Abstract
The invention discloses an automatic variable loading device for a hydraulic spring. A central power unit with dual pumps is adopted and is connected with an independent valve station corresponding to each coal pulverizer; a pipeline is connected to the valve station to three hydraulic cylinders of the bottom of the coal pulverizer; and the hydraulic cylinder is connected with a spring rack of the coal pulverizer through a loading lever near the coal pulverizer. Each oil pump set of the central power unit comprises a high-pressure axle flow piston pump, a low-pressure gear pump and an electric motor. The electric motor of each pump set drives the high-pressure axle flow piston pump and the low-pressure gear pump to operate so as to pump hydraulic oil to an oil supply pipeline and transport the hydraulic oil to the valve station. The hydraulic oil with constant pressure from a main oil station is transported to the hydraulic cylinder through the valve station; and subsequently, the hydraulic oil reflows to a main oil tank of the main oil station. The device can solve the technical problems that the prior MPS coal pulverizer fails to automatically adjust the loading force in time according to the power output of the coal pulverizer in operation, thereby causing the weak capacity of load adaptability.
Description
Technical field
The present invention relates to a kind of hydraulic spring automatic hydraulic load-variable device.
Technical background
In the coal-fired power plant of domestic early stage construction at present, considerable MPS coal pulverizer still adopts old-fashioned load mode: spring loads surely.In actual motion, this coal pulverizer exposes many shortcomings, and wherein Zui Da drawback is that its loading force is in operation and can not in time adjusts (be and decide loading) according to exerting oneself of coal pulverizer automatically.The size of its loading force is adjusted under off-line state in advance.In order to reduce the vibration of coal pulverizer, the minimum that must guarantee coal pulverizer is exerted oneself or on it, like this its minimum exert oneself just big, the operation stability when influencing the unit underload; In the time of will improving pulverizer capacity simultaneously, can not exceed exerting oneself under its set loading force again, just thisly decide a little less than the load mode load performance.Therefore, how to change this present situation and become one of problem that presses for solution at present.
Summary of the invention
The object of the present invention is to provide a kind of hydraulic spring automatic hydraulic load-variable device, can not in time adjust loading force automatically according to exerting oneself of coal pulverizer because of being in operation to solve traditional MPS coal pulverizer, and the weak technical problem of the load performance that causes.
Technical scheme of the present invention is as follows:
Adopt the central power unit of a configuration double pump, and be connected with every corresponding independent valve station of coal pulverizer, stainless steel pipes connects three hydraulic cylinders of valve station to the coal pulverizer bottom, and hydraulic cylinder is connected on the spring(-supported) mount of coal pulverizer by the load bar on coal pulverizer next door;
Described central power unit is made up of two oil pump groups, and each oil pump group all comprises a high pressure axial flow piston pump, a low pressure gear pump and an electro-motor, and when normally moving, pump group one fortune one is equipped with; Described high pressure axial flow piston pump (6,9) is one in front and one in back arranged installation with low pressure gear pump (7,10), the electro-motor of each pump group (5,8) drives high pressure axial flow piston pump (6,9) and low pressure gear pump (7,10) running, by inlet filter (1,2,3,4) and inlet ball valve (48,49,50,51), high pressure axial flow piston pump (6,9) pumps into hydraulic oil in the oil supply line, by the high-pressure ball valve (15) on high-pressure ball valve (11,13), high pressure non-return valve (12,14) and the female pipe, last hydraulic oil is transported to place, valve station; Be provided with the isolating valve (17) that is used to measure female pipe hydraulic coupling on female pipe, the relief tube that is connected between female pipe and the main fuel tank is provided with relief valve (16); The pipeline that inlet filter in the main fuel tank (2,4), inlet ball valve (49,51) and low pressure gear pump (7,10) are formed, the lubricated hydraulic oil that part is used for high pressure axial flow piston pump is sent into high pressure axial flow piston pump (6,9), most of hydraulic oil is pumped to and carries out in the hydronic low-pressure hydraulic oil pipeline, and described low-pressure hydraulic oil pipeline comprises filter (24) in low pressure check valve (19,20), heat exchanger (53), low pressure check valve (21), the low-pressure hydraulic oil pipeline successively, flow back in the main fuel tank (34) at last; Described low-pressure hydraulic oil pipeline also comprises the return line of low pressure check valve (22) composition that is connected with main fuel tank (34);
Come the constant pressure hydraulic oil at autonomous oil station to enter the valve station through pipeline and interface, by filter (36), inlet isolating valve (37), pressure-control valve (46), guide valve (43), outlet isolating valve (39) hydraulic oil under the operating pressure is transported in the hydraulic cylinder epicoele, in hydraulic cylinder, by the piston seal face, the hydraulic oil that belongs to the micro-seepage in the normal range (NR) finally flow back into the oil return pipe T1 interface that main oil is stood by hydraulic cylinder cavity of resorption, oil return pipe, inlet isolating valve (40) and outlet isolating valve (38), again to main fuel tank; Be connected with relief valve (45) and debugging flushing bypass valve (42) between oil supply line and oil return pipeline, described guide valve (43) is connected with directional control valve 44.
The oil return pipe T1 interface at aforesaid main oil station is connected with the inlet of triple valve (23), behind the hydraulic oil arrival triple valve (23) from the female pipe of oil return, three paths are arranged: the one, normal operation period, oil return directly by triple valve (23), flow back into main fuel tank (34); The 2nd, oil return is through triple valve (23) between the systemic circulation flush period, and the filter in the low-pressure hydraulic oil pipeline (24) flow back into main fuel tank (34); The 3rd, if the filter in the low-pressure hydraulic oil pipeline (24) stops up between flush period, then oil return is flowed back to fuel tank to main fuel tank by the relief valve (25) in triple valve (23) and the low-pressure hydraulic oil pipeline.
The invention has the beneficial effects as follows:
This hydraulic spring automatic hydraulic load-variable device with decide charger and compare: can adapt to wider load variations, improved the running status of coal pulverizer under the unit underload, reduced the recirculation of the inner raw coal of coal pulverizer, improved the adaptability of coal pulverizer to coal, improve the fineness of pulverized coal of coal pulverizer outlet, reduced vibration and the starting torque under the underload, lower coal pulverizer unit consumption and unburned carbon in flue dust thereof, can keep loading force constant in the wearing and tearing later stage of grinding roller, reduced carry state surely spring adjustment amount and because it has adopted the pattern of a main oil station with a plurality of valves stations, improvement cost is low, and maintenance is little.
Description of drawings
Fig. 1 is the overall system view of hydraulic spring automatic hydraulic load-variable device
Fig. 2 is the main oil station of central hydraulic power unit and the system diagram at valve station.
The specific embodiment
The present invention has adopted the network analysis design concept of machine configuration set one a cover hydraulic oil unit, and improvement cost is low, and the plant maintenance amount is little, simple and reliable for structure, and kept the partial devices of deciding loading, and can better adapt to the variation of unit load, can satisfy wider load variations.
This cover hydraulic spring automatic hydraulic load-variable device adopts the central power unit of a configuration double pump, and be connected with every corresponding independent valve station of coal pulverizer, stainless steel pipes connects three hydraulic cylinders of valve station to the coal pulverizer bottom, and hydraulic cylinder is connected on the spring(-supported) mount of coal pulverizer by the load bar on coal pulverizer next door.When the hydraulic pressure that comes from central power unit, by the valve station, when putting on the top of hydraulic cylinder, load bar moves down indentation, and spring(-supported) mount is pulled down, and the spring between spring(-supported) mount and the pressure frame is compressed, thereby has applied load on grinding roller.Reduce the pressure hydraulic pressure on hydraulic cylinder top, the spring of compression obtains discharging, thereby has reduced to be applied to the load on the grinding roller.
This device provides a kind of method, and promptly with the difference of the suffered hydraulic pressure of hydraulic cylinder load bar, the suffered load of grinding roller also changes accordingly, and the variation of native system hydraulic pressure changes with the variation of feeder coal-supplying amount among the DCS, can control the loading force of grinding roller automatically.
The main element of this hydraulic spring automatic hydraulic load-variable device is summarized as follows:
Central authorities' power unit
1, central power unit is in two chief components of spring auto-loading system one, and another is the valve station.Central authorities' power unit is made up of two oil pump groups, and each oil pump group all comprises a high pressure axial flow piston pump, a low pressure gear pump and an electro-motor.During normal the operation, pump group one fortune one is equipped with.When coal pulverizer normally moved, the flow that hydraulic cylinder needs was very little, and the flow size of high pressure axial flow piston pump depends on the interior leakage and the valve outlet port pressure drop of hydraulic cylinder, relief valve.High pressure axial flow piston pump provides constant compression force for the valve station.
2, oil circulating pump (cooling and filtration cycle pump)
An oil circulating pump (gear pump) is one in front and one in back arranged installation with each high-pressure pump, and its effect is cooling and filters main pump with oily.The inlet screen that every pump (comprising high pressure axial flow piston pump and gear pump) configuration is independent, inlet screen is provided with standby filter screen, is the pump continuous oil supply with the assurance.In most cases, wish that coal pulverizer moves under stable load, this just requires main pump pressure to keep constant, and oil stream is very little.When coal pulverizer moves under steady load like this, hydraulic system will produce considerable heat and very small amount of hydraulic oil stream.The effect of circulating pump is the heat of taking away in the oil, and effectively with its filtration.After coming out from circulating pump, the oil heat exchanger of flowing through, its cooling water flow is controlled by a temperature-sensing valve.The temperature sense instrument is arranged in the temperature sense instrument sleeve pipe of fuel tank.When temperature was enough low, valve closes was cut off cooling water.This valve is a control valve, can come the aperture of control valve according to given temperature range.In service normally, according to practical requirements, aperture can be regulated automatically, can make the oil temperature so evenly.Come the oil of automatic heat-exchanger to flow to dual oil strainer, be furnished with an electronic visual indicator above, be used for determining the pollution level of filter.The differential pressure of filter of flowing through can trigger indicator, and when filter screen was dirty, the indicator lamp on the central on the spot power unit electrical control cabinet door was bright, reports to the police on the spot.
3, central power unit electrical control cabinet
Central authorities' power unit is furnished with an electrical control cabinet, comprise electrical source of power disconnect, oil pump motor starter, dc source, the dirty light warning of filter screen in the cabinet, oil level is low and oil level is low-low light warning, the warm high light warning of oil, low oil pressure light warning, the indication of three-way valve positonlight, hydraulic pump start and stop button, power set stop promptly that emergency button, heater light are indicated, the terminal row of all leads on oily heating current contactor and the power set.
4, fuel tank
The visual glass of fuel tank one side is as the oil level indication.A type of respiration air cleaner is installed at the fuel tank top.Filter prevents that tank pressure from raising, and prevents that dirt from entering.Two float oil level switch are installed in the fuel tank, and one of them is set at, and oil level is low reports to the police, and another occurs obviously leaking in system, and oil level is low-when low, the intertripping oil pump.The startup loop of low-low oil level trip switch and oil pump, heater starting loop interlocking, when the oil level place low-during lower position, automatic trip pump and oil heater.During low oil level switch and low-low oil level switch triggering, provide low oil level to report to the police for distant place DCS simultaneously and low-low oil level tripping operation shows.Oil heater is installed on the oil extraction well in the fuel tank.Only this heater work when oily temperature is lower than uniform temperature.The control of heater is finished by DCS, and one group of K type armoured thermocouple is provided, and is connected the remote monitoring of realizing the oil temperature with DCS.
5, pressure sensor
Main pump outlet pressure (system's main-piping pressure) DCS in the distance shows by the pressure sensor realization that is installed on power unit.The startup of stand-by pump was finished by DCS when main pump low oil pressure warning and oil pressure reduced.When pressure reduced, " LOW PUMP PRESSURE " alarm settings was in a certain force value, and reporting to the police has time-delay.When pump pressure is low, " LOW PUMP PRESSURE " alarm lamp light on the power unit switch board on the spot.The pump low pressure alarming makes the directional control valve dead electricity at mill side valve door station simultaneously, causes hydraulically-controlled one-way valve to close.When hydraulically-controlled one-way valve was closed, cylinder pressure can increase and can not reduce, and pump low pressure alarming condition makes the hydraulic pressure locking like this, thereby prevented the reduction that hydraulic cylinder loads.When pressure is reduced to a certain value, the automatic startup of stand-by pump is set, the delayed startup stand-by pump in DCS.
6, pressure relief valve
On filtration and the cooling circuit pressure is installed and discharges valve, the effect of pressure relief valve is to prevent gear pump and system overpressure.Also be provided with a pressure relief valve on the power unit outlet conduit, the effect of this valve is to prevent high-pressure oil pump and loading system superpressure.
The valve station
1, valve station electrical control cabinet
Each valve all is furnished with electrical control cabinet.Switch board contain dc source, on the spot high/low pressure light warning, digital display, valve station emergency shutdown button, proportioning valve amplifier fastener, valve station inlet screen stop up the light indication, far grasp the terminal row of all leads on light indication and the valve operation platform on the spot with regard to ground pressure adjustment control, hydraulic cylinder locking on the spot/not latch buttons, cylinder pressure.
2, pressure control
The fuel feeding main-piping pressure comes from central power unit, and each valve station is connected with the female pipe of confession/oil return.Each separate operation in valve station.Each hydraulic station operate to an open cycle system, satisfy pressure control requirement by the solenoid of regulating ratio adjusting valve.When command signal increases or reduce, proportional pressure-reducing valve will be regulated the outlet flow of pressure-reducing valve.Signal increases regulates pressure-reducing valve reduction oil return flow, makes the pressure that improves load cylinder.On the contrary, signal reduces and increases the oil return flow, makes the pressure of pressure decline or minimizing oil cylinder.
3, hydraulically-controlled one-way valve and directional control valve
Directional control valve and hydraulically-controlled one-way valve are integrated to be installed on the valve station, hydraulically-controlled one-way valve between proportional pressure-reducing valve and the hydraulic cylinder, go on the pipeline of hydraulic cylinder, the inlet of directional control valve is taken from the pressure line between proportional pressure-reducing valve and the hydraulically-controlled one-way valve.Directional control valve is that magnetic valve is at normal operation period, solenoid energising on the directional control valve door, this just allows hydraulic action on the pilot valve valve port of hydraulically-controlled one-way valve, make one-way valve opens, after allowing full flow and pressure to act on the fooled direction valve electromagnetism dead electricity of hydraulic cylinder, spring loads axle and just gets to the side that direction valve connects oil return or fuel tank.Under the power down or the situation of promptly stopping, check valve will be closed like this, and hydraulic oil is locked in hydraulic cylinder.In addition, DCS selects " LOCK/UNLOCK " or in valve station switch board selection " LOCK/UNLOCK " on the spot, also will make the direction valve dead electricity, and hydraulic oil is locked on the hydraulic cylinder, thereby prevent that the grinding roller load from having bigger variation in the distance.
4, pressure relief valve
Coming on the pipe downstream of pressure-control valve relief valve to be installed between oil and the oil return.Purpose is to prevent that grinding roller from loading superpressure.
5, ball valve
The high pressure that ball valve is contained in gateway, a plurality of valves station respectively comes the oil return pipeline of oil pipeline and gateway, valve station.Unless be connected with hydraulic cylinder at portable hydraulic power unit, beyond oil return pipeline maintenance or the emergency, these ball valves usually should be in the position of " opening ".In the position of " opening ", valve does not limit the import and export flow of hydraulic cylinder.
6, pressure sensor
Hydraulic cylinder come to be equipped with on the oil pipe pressure transmitter, can provide an output signal to the digital pressure gauge of valve station regulator cubicle on the spot, be used for showing on the spot pressure, export distant place DCS simultaneously to and realize that teletransmission pressure shows.
7, pressure switch
Two pressure switches are installed on the pressure line in check valve downstream, and pressure switch is used to provide " low hydraulic pressure is reported to the police ", and another pressure switch provides one " high hydraulic pressure warning ", these switches simultaneously on the spot/distant place provides the indication of reporting to the police.
8, filter system
Each valve station inlet is provided with a high pressure inner core twin filter, has a visualizer to be used for determining whether filter is dirty on the filter, and indicator is triggered by the pressure drop at filter two ends, and when pressure drop reached a certain value, the expression filter was dirty.Filter does not have bypass.Filter dirty distant place indication is provided simultaneously.
Also have relatively simple hydraulic pressure cylinder assembly and load bar assembly in addition, more than four parts formed a cover hydraulic spring automatic hydraulic load-variable device.
The total system that has shown this device in Fig. 1 provides hydraulic power by a main oil station, adopts piping-main scheme to be connected with four deck valve door stations, be respectively coal pulverizer loading force is provided, according to power plant coal actual table number, be designed to the pattern of 1 band N, i.e. a main oil station band N N platform coal pulverizer.
At Fig. 2, in 3: 1.2.3.4. pump inlet strainer, 5. electro-motor, 6. high pressure axial flow piston pump, 7. low pressure gear pump, 8. electro-motor, 9. high pressure axial flow piston pump, 10. low pressure gear pump, 11. high-pressure ball valves, 12. high pressure non-return valves, 13. high-pressure ball valve, 14. high pressure check valves, 15. high-pressure ball valves, 16. relief valve, 17. isolating valves, 18. pressure dial plates, 19. low pressure check valve, 20. low pressure check valve, 21. low pressure check valve, 22. low pressure check valve, 23. triple valves, 24. filters, 25. relief valve, 26. the low pressure ball valve, 27. filters, 28. automatic regulating valves, 29. low pressure ball valve, 30. low pressure ball valve (standby), 31. low-low oil level switches, 32. low oil level switches, 33. breather valve, 34. main fuel tank, 35. heaters, 36. filters, 37. inlet isolating valve (oil supply line), 38. outlet isolating valve (oil return pipeline), 39. outlet isolating valves (oil supply line), 40. inlet isolating valves (oil return pipeline), 41. maintenance ball valve, 42. bypass valve, 43. guide valves, 44. directional control valves, 45. relief valve, the ball valve 46. pressure-control valve, 47. pressure dial plates, 48.49.50.51. enter the mouth, 52. thermometer, 53 heat exchangers.
Fig. 1 is an embodiment of the present invention, and wherein A, B, C, D are that four coal pulverizers, E, F, G, H are four deck valve door stations, and I is main oil station.Therefrom as can be seen, comprise a main oil station and four deck valve door stations in this example, 12 hydraulic cylinders and relevant connector are formed the complete hydraulic spring grease cup automatic loading device of a cover; Fig. 2 is the system diagram of this device, and main oil station (central power unit) is made up of two cover oil pump groups as can be seen in system diagram, and next fortune one of normal condition is equipped with, and is occurring under the situation of decompression, and the stand-by pump chain promoter is to keep enough pressure.Now introducing the operation logic of system: Fig. 2 with one operation of pump group is main oil station system diagram, introduce the workflow at main oil station earlier, in the pump group one, electro-motor 5 drives high pressure axial flow piston pump 6 and low pressure gear pump 7 runnings, by inlet filter 1 and inlet ball valve 48, high pressure axial flow piston pump pumps into hydraulic oil in the oil supply line, by high-pressure ball valve 11, high-pressure ball valve 15 on high pressure individual event ball valve 12 and the female pipe, last hydraulic oil is transported to place, valve station.Wherein isolating valve 17 is used to measure female pipe hydraulic fluid pressure, if the main-piping pressure overrate, relief valve 16 is opened automatically, discharges hydraulic oil to main fuel tank 34, is stabilized in setting value to keep oil pressure.Low pressure gear pump 7 plays double action lubricated and cooling, enter gear pump 7 by inlet filter 2 and inlet ball valve 49 hydraulic oil, part is used for lubricated high pressure axial flow piston pump 6, major part is pumped in the low-pressure hydraulic oil pipeline, successively by low pressure check valve 19, heat exchanger 53, low pressure check valve 21, filter 24 flow back in the main fuel tank 34 at last, and when flowing through heat exchanger 53, hydraulic oil is cooled water cooling to running temperature, cooling water is by low pressure ball valve 26, filter 27, automatic regulating valve 28 enters into heat exchanger, carries out discharging heat exchanger by low pressure ball valve 29 after the heat exchange with hydraulic oil.Stop up as filter, then directly flow back in the main fuel tank 34 by low pressure check valve 22 from the hydraulic oil of low pressure gear pump; Behind the hydraulic oil arrival triple valve 23 from the female pipe of oil return T1, three paths are arranged: the one, normal operation period, oil return directly by triple valve 23, flow back into main fuel tank; The 2nd, oil return is through triple valve 23 between the systemic circulation flush period, and filter 24 flow back into main fuel tank; The 3rd, if filter 24 stops up between flush period, then oil return is flowed back to fuel tank to main fuel tank by triple valve 23 and relief valve 25.
Fig. 3 is a valve station system diagram, be to combine in the frame of broken lines, the valve piece group that concurs, come the constant pressure hydraulic oil at autonomous oil station at first to arrive the F1 interface, by filter 36, inlet isolating valve (oil supply line) 37 enters in the valve piece group, control by central switch board, operating load according to coal pulverizer, be scaled corresponding hydraulic loaded pressure value signal and deliver to the hydraulic loaded switch board of substation, at pressure-control valve 46, relief valve 45, directional control valve 44, under the acting in conjunction of guide valve 43, be adjusted to the hydraulic working oil pressure that needs, at last by outlet isolating valve (oil supply line) 39, hydraulic oil under the operating pressure is transported in the hydraulic cylinder epicoele, and the different displacements by the hydraulic cylinder pull bar are delivered to the pressure frame successively to different loading forces, spring, last loading force is applied on the grinding roller, thereby make coal pulverizer realize that hydraulic pressure becomes loading, the hydraulic oil of the leakage of the trace in the hydraulic cylinder is by the hydraulic cylinder cavity of resorption, oil return pipe, inlet isolating valve (oil return pipeline) 40, outlet isolating valve (oil return pipeline) 38 finally flow back into the T1 interface at main oil station, enter into main fuel tank.
Claims (2)
1. hydraulic spring automatic hydraulic load-variable device, it is characterized in that: the central power unit that adopts a configuration double pump, and be connected with every corresponding independent valve station of coal pulverizer, stainless steel pipes connects three hydraulic cylinders of valve station to the coal pulverizer bottom, and hydraulic cylinder is connected on the spring(-supported) mount of coal pulverizer by the load bar on coal pulverizer next door;
Described central power unit is made up of two oil pump groups, and each oil pump group all comprises a high pressure axial flow piston pump, a low pressure gear pump and an electro-motor, and when normally moving, pump group one fortune one is equipped with; Described high pressure axial flow piston pump (6,9) is one in front and one in back arranged installation with low pressure gear pump (7,10), the electro-motor of each pump group (5,8) drives high pressure axial flow piston pump (6,9) and low pressure gear pump (7,10) running, by inlet filter (1,2,3,4) and inlet ball valve (48,49,50,51), high pressure axial flow piston pump (6,9) pumps into hydraulic oil in the oil supply line, by the high-pressure ball valve (15) on high-pressure ball valve (11,13), high pressure non-return valve (12,14) and the female pipe, last hydraulic oil is transported to place, valve station; Be provided with the isolating valve (17) that is used to measure female pipe hydraulic coupling on female pipe, the relief tube that is connected between female pipe and the main fuel tank is provided with relief valve (16); The pipeline that inlet filter in the main fuel tank (2,4), inlet ball valve (49,51) and low pressure gear pump (7,10) are formed, the lubricated hydraulic oil that part is used for high pressure axial flow piston pump is sent into high pressure axial flow piston pump (6,9), most of hydraulic oil is pumped to and carries out in the hydronic low-pressure hydraulic oil pipeline, and described low-pressure hydraulic oil pipeline comprises filter (24) in low pressure check valve (19,20), heat exchanger (53), low pressure check valve (21), the low-pressure hydraulic oil pipeline successively, flow back in the main fuel tank (34) at last; Described low-pressure hydraulic oil pipeline also comprises the return line of low pressure check valve (22) composition that is connected with main fuel tank (34);
The constant pressure hydraulic oil that comes autonomous oil to stand at first arrives the interface (F1) at valve station and locates, enter the valve station, by filter (36), inlet isolating valve (37), pressure-control valve (46), guide valve (43), outlet isolating valve (39) is transported to the hydraulic oil under the operating pressure in the hydraulic cylinder epicoele, in hydraulic cylinder, by the piston seal face, the hydraulic oil that belongs to the micro-seepage in the normal range (NR) is by the hydraulic cylinder cavity of resorption, oil return pipe, inlet isolating valve (40) and outlet isolating valve (38) finally flow back into the oil return pipe interface (T1) at main oil station and locate, again to main fuel tank; Be connected with relief valve (45) and debugging flushing bypass valve (42) between oil supply line and oil return pipeline, described guide valve (43) is connected with directional control valve (44).
2. a kind of hydraulic spring automatic hydraulic load-variable device as claimed in claim 1, it is characterized in that: the oil return pipe interface (T1) at main oil station is connected with the inlet of triple valve (23), behind the hydraulic oil arrival triple valve (23) from the female pipe of oil return, three paths are arranged: the one, normal operation period, oil return directly by triple valve (23), flow back into main fuel tank (34); The 2nd, oil return is through triple valve (23) between the systemic circulation flush period, and the filter in the low-pressure hydraulic oil pipeline (24) flow back into main fuel tank (34); The 3rd, if the filter in the low-pressure hydraulic oil pipeline (24) stops up between flush period, then oil return is flowed back to fuel tank to main fuel tank by the relief valve (25) in triple valve (23) and the low-pressure hydraulic oil pipeline.
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| CN2008102278707A CN101412001B (en) | 2008-12-02 | 2008-12-02 | Hydraulic spring automatic hydraulic load-variable device |
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|---|---|---|---|
| CN2008102278707A CN101412001B (en) | 2008-12-02 | 2008-12-02 | Hydraulic spring automatic hydraulic load-variable device |
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| CN101412001B true CN101412001B (en) | 2011-05-18 |
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