CN201339618Y - Hydraulic spring automatic variable loading device - Google Patents
Hydraulic spring automatic variable loading device Download PDFInfo
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- CN201339618Y CN201339618Y CNU2008201240676U CN200820124067U CN201339618Y CN 201339618 Y CN201339618 Y CN 201339618Y CN U2008201240676 U CNU2008201240676 U CN U2008201240676U CN 200820124067 U CN200820124067 U CN 200820124067U CN 201339618 Y CN201339618 Y CN 201339618Y
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Abstract
The utility model discloses a hydraulic spring automatic variable loading device, which adopts a central power unit with a dual-pump and is connected with a separate valve station corresponding to each coal pulverizer, and a pipeline is connected with the valve station to three hydraulic cylinders at the bottom of the coal pulverizer; the hydraulic cylinders are connected with the spring bracket of the coal pulverizer through a loading rod beside the coal pulverizer, and each oil pump group of the central power unit comprises a high-pressure axial flow piston pump, a low-pressure gear pump and an electric motor; the electric motor of each pump group drives the high-pressure axial flow piston pump and the low-pressure gear pump to operate to pump the hydraulic oil in an oil supply pipeline, and then the hydraulic oil is conveyed to the valve station; the pressure-constant hydraulic oil from a main oil station is conveyed to the hydraulic cylinders by the valve station, and then the hydraulic oil flows back to the main oil tank of the main oil station. The device can solve the technical problems that the load adaptability is weak because the traditional MPS coal pulverizer can not timely and automatically adjust the loading force according to the output of the coal pulverizer.
Description
Technical field
The utility model 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 low-load; 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 purpose of this utility model is to provide a kind of hydraulic spring automatic hydraulic load-variable device, can not in time adjust loading force automatically to solve traditional MPS coal pulverizer according to exerting oneself of coal pulverizer because of being in operation, and the weak technical problem of the load performance that causes.
The technical solution of the utility model 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 pipeline connects three oil hydraulic cylinders of valve station to the coal pulverizer bottom, and oil hydraulic cylinder is connected on the spring bracket 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 reciprocating pump, a low pressure gear pump and an electric motor, and when normally moving, pump group one fortune one is equipped with; Described high pressure axial flow reciprocating pump (6,9) is one in front and one in back arranged installation with low pressure gear pump (7,10), the electric motor of each pump group (5,8) drives high pressure axial flow reciprocating 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 reciprocating 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 individual event ball valve (12,14) and the female pipe, last hydraulic oil is transported to place, valve station; Be provided with the separating 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 Decompression valves (16); The pipeline that pump inlet strainer 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 reciprocating pump is sent into high pressure axial flow reciprocating 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 low pressure check valve (19,20), heat exchanger (53), low pressure check valve (21), filter (24) 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 at first to arrive the F1 jointing, enter the valve station, by filter (36), oil supply line inlet separating valve (37), pressure controlled valve (46), pilot valve (43), oil supply line outlet separating valve (39) is transported to the hydraulic oil under the working pressure in the oil hydraulic cylinder epicoele, in oil hydraulic cylinder, by the piston seal face, the hydraulic oil that belongs to the micro-seepage in the normal range (NR) is by the oil hydraulic cylinder cavity of resorption, return tube, oil return pipeline inlet separating valve (40) and oil return pipeline outlet separating valve (38) finally flow back into the return tube T1 jointing at main oil station, again to main fuel tank; Be connected with Decompression valves (45) and debugging flushing by-pass valve (42) between oil supply line and oil return pipeline, described pilot valve (43) is connected with position control valve (44).
The return tube T1 interface at aforesaid main oil station is connected with the inlet of three-way valve (23), behind the hydraulic oil arrival three-way valve (23) from the female pipe of oil return, three paths are arranged: the one, normal operation period, oil return directly by three-way valve (23), flow back into main fuel tank (34); The 2nd, oil return is through three-way valve (23) between the systemic circulation flush period, and filter (24) flow back into main fuel tank (34); The 3rd, if filter (24) stops up between flush period, then oil return is flowed back to fuel tank to main fuel tank by three-way valve (23) and Decompression valves (25).
The beneficial effects of the utility model are:
This hydraulic spring automatic hydraulic load-variable device with decide deceleration loading device and compare: can adapt to wider load variations, improved the running state of coal pulverizer under the unit low-load, 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 low-load, 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, reforming 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 system diagram of central hydraulic power unit.
Fig. 3 is the valve station system diagram of central hydraulic power unit.
Embodiment
The utility model has adopted the system analysis design concept of machine configuration set one a cover hydraulic oil unit, and reforming 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 pipeline connects three oil hydraulic cylinders of valve station to the coal pulverizer bottom, and oil hydraulic cylinder is connected on the spring bracket 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 oil hydraulic cylinder, load bar moves down indentation, and spring bracket is pulled down, and the spring between spring bracket and the pressure frame is compressed, thereby has applied load on grinding roller.Reduce the pressure hydraulic pressure on oil 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 oil 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 coal-feeding conveyer coal-supplying amount among the DCS, can control the loading force of grinding roller automatically.
The primary component 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 reciprocating pump, a low pressure gear pump and an electric motor.During normal the operation, pump group one fortune one is equipped with.When coal pulverizer normally moved, the flow that oil hydraulic cylinder needs was very little, and the flow size of high pressure axial flow reciprocating pump depends on the interior leakage and the valve outlet port pressure drop of oil hydraulic cylinder, relief valve.High pressure axial flow reciprocating 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 service pump, and its effect is cooling and filters main pump with oily.The inlet screen that every pump (comprising high pressure axial flow reciprocating 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 high pressure oil stream.The effect of recycle pump is the heat of taking away in the oil, and effectively with its filtration.After coming out from recycle pump, the oil heat exchanger of flowing through, its cooling water flow is controlled by a thermostat 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 modulating valve, can come the aperture of regulating 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 tutorial light 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 Circuit breaker, oil pump motor starter, DC electrical 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 fuel pressure light warning, the indication of three-way valve positonlight, oil hydraulic pump start and stop button, power plant stop promptly that emergency button, heater light are indicated, the terminal row of all leads on oily heating current contactor and the power plant.
4, fuel tank
The visual glass of fuel tank one side is as the oil level indication.A respiration type air filter is installed at the fuel tank top.Filter prevents that tank pressure from raising, and prevents that dirt from entering.Two float oil level switchs 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 sheathed thermocouple is provided, and is connected the remote monitoring of realizing the oil temperature with DCS.
5, pressure transducer
Main pump outlet pressure (system's main-piping pressure) DCS in the distance shows by the pressure transducer realization that is installed on power unit.The startup of stand by pump was finished by DCS when main pump low fuel 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 pumping pressure is low, " LOW PUMP PRESSURE " warning light light on the power unit control cabinet on the spot.The pump low pressure alarming makes the position 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 oil 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.Control cabinet contain DC electrical source, on the spot high/low pressure light warning, digital display, valve station emergency shutdown button, Proportional 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, oil 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 system, satisfy the 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 outer pipe flow of reduction valve.Signal increases regulates reduction 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 position control valve
Position 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 oil hydraulic cylinder, go on the pipeline of oil hydraulic cylinder, the inlet of position control valve is taken from the pressure line between proportional pressure-reducing valve and the hydraulically-controlled one-way valve.Position control valve is that solenoid valve is at normal operation period, electromagnetic coil energising on the position control valve door, this just allows hydraulic pressure 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 directional control valve electromagnetism dead electricity of oil hydraulic cylinder, the spring-loaded axle is just got to the side that directional control valve connects oil return or fuel tank.Under the power down or the situation of promptly stopping, one-way valve will be closed like this, and hydraulic oil is locked in oil hydraulic cylinder.In addition, DCS selects " LOCK/UNLOCK " or in valve station control cabinet selection " LOCK/UNLOCK " on the spot, also will make the directional control valve dead electricity, and hydraulic oil is locked on the oil 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 controlled 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 oil 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 oil hydraulic cylinder.
6, pressure transducer
Oil 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 the teletransmission pressure-display.
7, pressure switch
Two pressure switches are installed on the pressure line in one-way 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 visual indicator 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 platform coal pulverizer.
At Fig. 2, in 3: 1.2.3.4. pump inlet strainer, 5. electric motor, 6. high pressure axial flow reciprocating pump, 7. low pressure gear pump, 8. electric motor, 9. high pressure axial flow reciprocating 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 one-way valves, 15. high-pressure ball valves, 16. Decompression valves, 17. separating 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. three-way valve, 24. filters, 25. Decompression valves, 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. vent valve, 34. main fuel tank, 35. heaters, 36. filters, 37. oil supply line inlet separating valve, 38. oil return pipeline outlet separating valve, 39. oil supply lines outlet separating valve, 40. oil return pipelines inlet separating valve, 41. maintenance ball valve, 42. by-pass valve, 43. pilot valves, 44. position control valves, 45. Decompression valves, the ball valve 46. pressure controlled 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 utility model, 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 oil hydraulic cylinders and relevant link are formed the complete hydraulic spring grease cup automatic loading device of a cover; Fig. 2 is the main oil station 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 running principle 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, electric motor 5 drives high pressure axial flow reciprocating pump 6 and low pressure gear pump 7 runnings, by pump inlet strainer 1 and inlet ball valve 48, high pressure axial flow reciprocating 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 and jointing X1, last hydraulic oil is transported to place, valve station.Wherein separating valve 17 is used to measure female pipe hydraulic fluid pressure, if the main-piping pressure overrate, Decompression valves 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 low pressure gear pump 7 by pump inlet strainer 2 and inlet ball valve 49 hydraulic oil, part is used for lubricated high pressure axial flow reciprocating 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, hydraulic oil from low pressure gear pump then directly flow back in the main fuel tank 34 by low pressure check valve 22, stand the T1 jointing after the hydraulic oil of the female pipe of oil return arrives three-way valve 23 from main oil, three paths are arranged: the one, normal operation period, oil return directly by three-way valve 23, flow back into main fuel tank; The 2nd, oil return is through three-way 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 three-way valve 23 and Decompression valves 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 jointing, by filter 36, oil supply line inlet separating valve 37 enters in the valve piece group, control by central control cabinet, operating load according to coal pulverizer, be scaled corresponding hydraulic loaded pressure value signal and deliver to the hydraulic loaded control cabinet of substation, at pressure controlled valve 46, Decompression valves 45, position control valve 44, under the acting in conjunction of pilot valve 43, be adjusted to the hydraulic working oil pressure that needs, at last by oil supply line outlet separating valve 39, valve station fuel feeding outlet A1, hydraulic oil under the working pressure is transported in the oil hydraulic cylinder epicoele, different displacements by the oil hydraulic cylinder pull bar, different loading forces is delivered to the pressure frame successively, spring, last loading force is applied on the grinding roller, thereby makes coal pulverizer realize that hydraulic pressure becomes loading, the hydraulic oil of the leakage of the trace in the oil hydraulic cylinder, by oil hydraulic cylinder cavity of resorption, return tube, valve station oil return import B1, oil return pipeline inlet separating valve 40, oil return pipeline outlet separating valve 38 finally flow back into the T1 jointing at main oil station, enters into main fuel tank.
Claims (2)
1, a kind of 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 pipeline connects three oil hydraulic cylinders of valve station to the coal pulverizer bottom, and oil hydraulic cylinder is connected on the spring bracket 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 reciprocating pump, a low pressure gear pump and an electric motor, and when normally moving, pump group one fortune one is equipped with; Described high pressure axial flow reciprocating pump (6,9) is one in front and one in back arranged installation with low pressure gear pump (7,10), the electric motor of each pump group (5,8) drives high pressure axial flow reciprocating 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 reciprocating 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 individual event ball valve (12,14) and the female pipe, last hydraulic oil is transported to place, valve station; Be provided with the separating 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 Decompression valves (16); The pipeline that pump inlet strainer 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 reciprocating pump is sent into high pressure axial flow reciprocating 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 low pressure check valve (19,20), heat exchanger (53), low pressure check valve (21), filter (24) 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 at first to arrive the F1 jointing, enter the valve station, by filter (36), oil supply line inlet separating valve (37), pressure controlled valve (46), pilot valve (43), oil supply line outlet separating valve (39) is transported to the hydraulic oil under the working pressure in the oil hydraulic cylinder epicoele, in oil hydraulic cylinder, by the piston seal face, the hydraulic oil that belongs to the micro-seepage in the normal range (NR) is by the oil hydraulic cylinder cavity of resorption, return tube, oil return pipeline inlet separating valve (40) and oil return pipeline outlet separating valve (38) finally flow back into the return tube T1 jointing at main oil station, again to main fuel tank; Be connected with Decompression valves (45) and debugging flushing by-pass valve (42) between oil supply line and oil return pipeline, described pilot valve (43) is connected with position 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 return tube T1 interface at main oil station is connected with the inlet of three-way valve (23), behind the hydraulic oil arrival three-way valve (23) from the female pipe of oil return, three paths are arranged: the one, normal operation period, oil return directly by three-way valve (23), flow back into main fuel tank (34); The 2nd, oil return is through three-way valve (23) between the systemic circulation flush period, and filter (24) flow back into main fuel tank (34); The 3rd, if filter (24) stops up between flush period, then oil return is flowed back to fuel tank to main fuel tank by three-way valve (23) and Decompression valves (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201240676U CN201339618Y (en) | 2008-12-02 | 2008-12-02 | Hydraulic spring automatic variable loading device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201240676U CN201339618Y (en) | 2008-12-02 | 2008-12-02 | Hydraulic spring automatic variable loading device |
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| Publication Number | Publication Date |
|---|---|
| CN201339618Y true CN201339618Y (en) | 2009-11-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201240676U Expired - Lifetime CN201339618Y (en) | 2008-12-02 | 2008-12-02 | Hydraulic spring automatic variable loading device |
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| CN (1) | CN201339618Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101412001B (en) * | 2008-12-02 | 2011-05-18 | 北京博希格动力技术有限公司 | Hydraulic spring automatic hydraulic load-variable device |
| CN103511004A (en) * | 2013-09-17 | 2014-01-15 | 上海新力机器厂 | Closed electro-hydraulic actuator and assembly of closed electro-hydraulic actuator |
-
2008
- 2008-12-02 CN CNU2008201240676U patent/CN201339618Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101412001B (en) * | 2008-12-02 | 2011-05-18 | 北京博希格动力技术有限公司 | Hydraulic spring automatic hydraulic load-variable device |
| CN103511004A (en) * | 2013-09-17 | 2014-01-15 | 上海新力机器厂 | Closed electro-hydraulic actuator and assembly of closed electro-hydraulic actuator |
| CN103511004B (en) * | 2013-09-17 | 2015-05-13 | 上海新力机器厂 | Closed electro-hydraulic actuator and assembly of closed electro-hydraulic actuator |
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Granted publication date: 20091104 Effective date of abandoning: 20081202 |