CN101865186B - Online oil filling and purifying device for hydraulic equipment - Google Patents
Online oil filling and purifying device for hydraulic equipment Download PDFInfo
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- CN101865186B CN101865186B CN 201010144827 CN201010144827A CN101865186B CN 101865186 B CN101865186 B CN 101865186B CN 201010144827 CN201010144827 CN 201010144827 CN 201010144827 A CN201010144827 A CN 201010144827A CN 101865186 B CN101865186 B CN 101865186B
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Abstract
The invention discloses an online oil filling and purifying device for hydraulic equipment. The main design points are that: an oil tank is provided with a vacuumization control system; the oil tank is divided into an absolute oil tank and a dirty oil tank; the absolute oil tank is provided with an oil inlet pipeline; the dirty oil tank is provided with an oil drain valve; an online circulating filtration system comprises a dirty oil pipeline communicated with the dirty oil tank and an absolute oil pipeline communicated with the absolute oil tank; the dirty oil pipeline is provided with a dirty oil electromagnetic control valve; the tips of the dirty oil pipeline and the absolute oil pipeline are respectively provided with a dirty oil pipeline quick connector and an absolute oil pipeline quick connector which are communicated with the oil tank of the hydraulic equipment; the dirty oil pipeline is communicated with the absolute oil pipeline through an isolation electromagnetic valve, a one-way valve and a gear pump; and a pressure filter is arranged in the absolute oil pipeline. The online oil filling and purifying device for the hydraulic equipment designed in the invention has the characteristics of high integration degree, complete functions, compact structure, and high maneuverability and maintainability.
Description
Technical field
The present invention relates to hydraulic equipment, specifically hydraulic equipment oil filling and the clean special purpose device filtered.
Background technique
Hydraulic equipment is widely used in the machinery of industry-by-industry, and the cleaning of its fluid and oil circuit is the essential condition that assurance equipment runs well.In order to guarantee the clean of hydraulic system, people will adopt following measures usually: 1) periodic replacement hydraulic oil (must change hydraulic oil about general half a year, hydraulic oil must meet the requirements); 2), before fresh oil is injected to fuel tank, must first through precision, filter; 3) adopt the qualified filter core of crossing, when crossing filter core and reporting to the police or must change once in three months; 4) make regular check on oil, change oil once oil descends.Said method not only operation is various, and cost is high.For addressing these problems, people, when regularly hydraulic equipment being changed oil, are also cleaned hydraulic system.At present the cleaning means are mainly to use the manually operated type device such as manual pump to be cleaned hydraulic equipment, this class device has complex operation, can't carry out the fluid filtration, can not carry out the oil circuit cleaning, can't know contamination level of oil liquid, easily cause secondary pollution, the shortcoming such as thorough that is difficult to annotate, and also can't realize the effective control to the filling Oil Quality simultaneously.And such device can't realize the quick discharge of gas in fluid, after filling, hydraulic equipment needs standingly more than 24 hours, can use, therefore consuming time longer.
Summary of the invention
Purpose of the present invention just is to provide a kind of online oil filling and purification plant of hydraulic equipment, so that hydraulic equipment can complete oil filling, the clean filtration of oil circuit, sump oil detection, sump oil replacing overall process in the course of the work automatically, thereby hydraulic equipment is implemented to high maintenance.
The present invention is achieved in that
The online oil filling of hydraulic equipment provided by the present invention and purification plant, include fuel reserve tank, vacuumize control system, online circulated filter system, power-supply system, circuit control system, and its design main points are on fuel reserve tank, to be provided with to vacuumize control system; Fuel reserve tank is divided into absolute oil case and sump oil case, and the absolute oil case is provided with in-line, and the sump oil case is provided with fuel outlet valve; Described online circulated filter system includes the sump oil pipeline linked with the sump oil case and the absolute oil pipeline linked with the absolute oil case, be provided with the sump oil solenoid electric valve at the sump oil pipeline, the termination of sump oil pipeline and absolute oil pipeline be respectively equipped with can with contaminated-oil pipeline quick connector and the absolute oil quick-mountable pipe jointer of hydraulic equipment fuel tank UNICOM; The sump oil pipeline is connected by isolation solenoid valve, one-way valve, gear pump with the absolute oil pipeline; Be provided with filter-press in the absolute oil pipeline.
The online oil filling of hydraulic equipment and the purification plant that so design, filling fluid enters described absolute oil case after processing after filtration; Described sump oil case is used for depositing the waste oil from hydraulic equipment from extracting out, by described fuel outlet valve, waste oil is discharged; On fuel reserve tank, the set control system that vacuumizes, control by the vacuum pressure in absolute oil case, sump oil box body, realizes the on-line oil cleaning filling of hydraulic equipment, contaminated oil, residual air discharge.Its online circulated filter system carries out filtration treatment to the fluid of extracting out from the hydraulic equipment fuel tank, and then is transmitted back in the hydraulic equipment fuel tank, thereby has realized the on-line cleaning of hydraulic equipment fluid and oil circuit is purified.
The online oil filling of hydraulic equipment that the present invention the is designed and integrated degree of purification plant is high, complete function, compact structure, operability and maintenance are good, are applicable to multiple industry and department.
The accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention.
Fig. 2 is the structural representation of the specific embodiment of the invention.
Fig. 3 is control panel structural drawing of the present invention.
Embodiment
As shown in Figure 1 and Figure 2, the present invention includes fuel reserve tank, vacuumized control system, online circulated filter system, power-supply system, circuit control system, be provided with on fuel reserve tank and vacuumize control system; Circuit control system wherein comprises array PLC programmable controller (as the LOGO 12/24RC type programmable controller of SIEMENS), according to the program arranged, the control of oil circuit switching and related system under the various working staties of completion system, thus realize the automatic control of apparatus of the present invention.Its control panel of circuit control system in the present invention as shown in Figure 3, includes power knob 31, vacuum pump button 32, oil pump button 33, detector button 34, filling/self-loopa button 37, vacuum pressure dial plate 21a, filling pressure dial plate 3a.Also can establish as required product cleans button 35, drains the oil and prepare button 36, manual/auto button 38.
Power-supply system is comprised of power module, is used for to the whole system power supply, and input voltage is AC220V, and output voltage is DC24V.
Fuel reserve tank is divided into absolute oil case 13 and sump oil case 14, and absolute oil case 13 is provided with in-line, and sump oil case 14 is provided with fuel outlet valve 16; The absolute oil case is for depositing clean fluid, and sump oil case 14 is used for depositing the waste oil from hydraulic equipment from extracting out, and by fuel outlet ball valve 16, waste oil is discharged.The foundation that is set to sump oil pipeline and absolute oil pipeline of only/sump oil case provides assurance with separating.
Described online circulated filter system includes the sump oil pipeline linked with the sump oil case and the absolute oil pipeline linked with the absolute oil case, and the sump oil pipeline is connected by isolation solenoid valve 26, one-way valve 27, gear pump 10 with the absolute oil pipeline; Be provided with filter-press 4 in the absolute oil pipeline; Be provided with sump oil solenoid electric valve 23 at the sump oil pipeline; The termination of sump oil pipeline and absolute oil pipeline is respectively equipped with contaminated-oil pipeline quick connector 24 and absolute oil quick-mountable pipe jointer 1; This device can be connected with the hydraulic equipment fuel tank fast by this quick connector (24,1), makes thus hydraulic equipment fuel tank and online circulated filter system form loop.
In order effectively to control the degree of purity of filling fluid, can in the in-line on absolute oil case 13, be provided with oil sucting valve 9, oil absorption filter 12 and solenoid electric valve 11.So filling fluid enters described absolute oil case 13 after filtering by described oil suction ball valve 9, solenoid electric valve 11 and oil absorption filter 12 under the effect of gear pump.The filter core of native system middle filtrator can adopt ARGO company 3 μ m glass fibre filter cores, and it is single twin-stage external gear pump that gear pump can adopt SG0535 type prestige to agree pump.
For the ease of observing height and the temperature of liquid in absolute oil case, sump oil case, on described fuel reserve tank (absolute oil case, sump oil case), can be provided with liquid level liquid temperature display device (17,29).
Above design, when solenoid electric valve 11 cuts out, described gear pump 10 is extracted the fluid in the hydraulic equipment fuel tank out by the isolation solenoid valve 26 in the sump oil pipeline, one-way valve 27, again after filter-press 4 filters, enter the absolute oil pipeline through Flow valve 2, and flow into the hydraulic equipment fuel tank by the hydraulic pressure quick connector, realized that thus hydraulic equipment fuel tank, oil circuit reach the wherein online circulating filtration of fluid.
In order to realize the circulation auto purification of absolute oil case filling fluid, can be provided with in said apparatus and add the oiling circulated filter system, the gear pump 10 of this system in absolute oil case 13, pipeline, online circulated filter system, the filter-press 4 in the absolute oil pipeline form.When gear pump 10 starts, the fluid in absolute oil case 13 is passed through to oil absorption filter 12 and 11 extractions of absolute oil case solenoid valve, then flow into absolute oil casees 13 through filter-press 4 filtrations by Flow valve 2, thereby realized the circulation auto purification of absolute oil case filling fluid.
For the ease of contamination level of oil liquid in absolute oil case 13, online circulated filter system and hydraulic equipment fuel tank is faced to control in real time, can in above-mentioned online circulated filter system, be provided with granule detecting instrument 6.This granule detecting instrument 6, by online sampling, granule detecting, shows the cleanliness of fluid in online circulated filter system in real time.Solved thus that fluid in traditional filling cleaning equipment can not quantitatively detect, sump oil changes the unscientific problem of controlling.
In order to prevent that filter-press 4 in this device from causing whole system breakdown because of cleaning in time, a clogging indicator 5 can be set on upward pressure filter 4, when filter-press 4 overwork, clogging indicator 5 can send warning in time, so that clean in time or change filter-press.
Vacuum system in apparatus of the present invention can adopt the JP-40V type of VACUAIR company to realize without oily piston type vacuum pump.Arranging on the one hand of this system can force the discharge fully of contaminated oil in hydraulic equipment, residual air for hydraulic equipment is pumped, bled, thereby solved the problems such as repeated contamination that thoroughly do not cause because of the discharge of equipment sump oil; On the other hand also can vacuum oil-pumping, bleed basis on, switch to the vacuum filling state of hydraulic equipment fluid by circuit control system, abundant to guarantee oil filling; Meanwhile, because gas in filling fluid can be separated out fast under the suction function of vacuum system, therefore without long-time standing exhaust again.
Described its most simple and practical scheme of control system that vacuumizes is, vacuumize control system and include vacuum pump 19, vacuum-pumping pipeline, be provided with on vacuum-pumping pipeline and control solenoid valve 20 and pressure-releasing electromagnetic valve 18, at the end of vacuum-pumping pipeline, be provided with air filter 22; Absolute oil case 13, sump oil case 14 are in parallel by unicom pipeline, are provided with Vacuum ball valve 15 in parallel pipeline.By Vacuum ball valve 15, can vacuumize sump oil case 14, also can vacuumize absolute oil case 13, the gas of separating out from the fluid that sump oil case 14 and absolute oil case 13 are deposited is discharged after filtering by described pressure-releasing electromagnetic valve 18 and air filter 22, and air filter 22 also can prevent the pollution of ambient atmos.
In order further to improve apparatus of the present invention function, can be provided with liquid level liquid temperature display device (17,29) on described fuel reserve tank, so that observe height and the oil liquid temperature of fuel reserve tank inner fluid face; Can be provided with filling pressure gauge 3 in described absolute oil pipeline, so that control the pressure state in the absolute oil pipeline.Viewing window 28 is set in the sump oil pipeline, can observes the discharge situation of fluid in hydraulic equipment.
The working procedure that apparatus of the present invention are more detailed is as follows:
When the liquid level liquid thermometer 29 of absolute oil case repairing-----on system absolute oil case 13 shows lower than 1/2 scale, carry out repairing.Now the oil suction flexible pipe is put into to the finished product oil drum, open oil suction ball valve 9, absolute oil case solenoid valve 11, in closed condition, is pressed power switch button 31 and is connected general power, press oil pump button 33, electric motor starting gear pump 10, fluid is under gear pump 10 entrance negative pressure effects, by oil suction flexible pipe, oil suction ball valve 9, absolute oil case solenoid valve 11 is opened, and enter absolute oil case 113 after oil absorption filter 12 filters, when absolute oil case 13 liquid level liquid thermometers 29 reach 2/3 scale, repairing finishes.
Filling fluid automatic fitration------, before hydraulic equipment being annotated at every turn and purifying, is filtered filling fluid.Now close oil suction ball valve 9, connect general power, press filling/self-loopa button 37, absolute oil case solenoid valve 11 is opened, and isolation solenoid valve 26 is closed, and Flow valve 2 disconnects with rapid pipe joint 1.Press pump start button 33 starter receiver pumps 10, fluid passes through oil absorption filter 12 oil suction from absolute oil case 13 under gear pump 10 entrance negative pressure effects, and returns to absolute oil case 13 through filter-press 4 and internal oil passages.So circulation, the particle in fluid is progressively by filter-press 4 filterings.After moving 15 minutes, press the counter test button 34 of granule detecting instrument, fluid enters detection port by sampling loop, and demonstrates the dustiness NAS grade of fluid, can make fluid reach more high-cleanness, high by extending filtration time if necessary.
Vacuum oil-pumping-----is connected with absolute oil case quick connector 1 absolute oil pipe 30, contaminated oil pipe 25 respectively with sump oil case quick connector 24, this device and hydraulic equipment fuel tank are connected.Open sump oil case solenoid valve 23, make it to form path, open Vacuum ball valve 15, close pressure-releasing electromagnetic valve 18 and fuel outlet ball valve 16.Press vacuum pump button 32 and start vacuum pump, under vacuum pump 19 effects, at the oil outlet of hydraulic equipment, set up certain degree of vacuum, under vacuum action, in hydraulic equipment, fluid is drawn out of, and enters sump oil case 14.Can observe the discharge situation of fluid in hydraulic equipment by viewing window 28, when viewing window 28 can't see the oil outflow, show that the hydraulic equipment inner fluid is discharged totally.Vacuum pump 19 also vacuumizes by 15 pairs of absolute oil casees 13 of Vacuum ball valve simultaneously, and in absolute oil case 13 inner fluids, bubble can be separated out fully, has effectively guaranteed the cleanliness of filling fluid.Pump complete, press vacuum pump button 32, vacuum pump 19 shuts down.While needing the discharge vacuum, open pressure-releasing electromagnetic valve 18, the value of pressure vacuum gauge 21 is made zero, then it is clean the discharge of the fluid in sump oil case 14 to open fuel outlet ball valve 16.
Fluid vacuum filling------need to carry out oil filling to it after fluid in hydraulic equipment is extracted out fully.Absolute oil pipe 30 filler openings and hydraulic equipment fuel tank are joined, open Vacuum ball valve 15, open pressure-releasing electromagnetic valve 18, ambient air will enter absolute oil case 13 by air filter 22, absolute oil case 13 is removed vacuum, so that the fluid in absolute oil case 13 can be taken away by gear pump 10.Close oil suction ball valve 9, prevent that extraneous fluid from entering system, open absolute oil case solenoid valve 11, press oil pump button 33 starting electrical machinerys 7, by coupling 8 driven gear pumps 10, absolute oil case 13 inner fluids are inhaled into gear pump 10, then under the effect of gear pump 10, flow into filter-press 4 and are filtered, and by clogging indicator 5, observe blocking state of filter.Slowly open Flow valve 2, observe the output stream value, the fluid after filtration will flow into the hydraulic equipment fuel tank by absolute oil pipe 30, thereby realize the oil filling to hydraulic equipment.In filling process, the hydraulic equipment loop keeps the vacuum state after vacuum oil-pumping, can guarantee the adequacy of oil filling.
Online circulating filtration------is opened granule detecting instrument 6 switches, and fluid enters granule detecting instrument 6, but real-time online detects the particulate pollutant dustiness, gives and determines that filtration time provides foundation.Press product and clean button 35, connect absolute oil case solenoid valve 11 and Flow valve 2, press oil pump button 33 starting electrical machinerys 10, by coupling 8 driven gear pumps 10, fluid flows into filter-press 4 under the effect of gear pump 10, the fluid of 4 pairs of inflows of filter-press carries out high-precision filtration, by pollutant filtering in fluid.Fluid after filtration will flow into hydraulic equipment fuel tank filler opening, wherein the clean fluid of the fluid in fuel tank and pipeline and inflow flows out from oil outlet by hydraulic equipment fuel tank and pipeline after mixing, and then under the effect of gear pump 10, repeated to filter, complete the stroke that circulating filtration cleans.By constantly filtering cleaning, can take pollutant in hydraulic equipment fuel tank and pipeline out of then filtering, effectively reduced pollutant in hydraulic equipment fluid and oil circuit, improved Oil Quality.At circulating filtration, detected in 30 minutes, oil quality can reach the standard of NAS-5 level.
The filling of the designed device oil-collecting of the present invention liquid, fluid filtration, on-line cleaning, online detection, fluid gas quick drain, automatic control are integrated, and it is rational in infrastructure, and cost is low.
The present invention more specifically usefulness shows the following aspects:
One, closed system design.Prior art (hydraulic oil is manually annotated), when carrying out oil filling, repeatedly convert oil pipe, and new fluid also is exposed in air fully, belongs to open filling, and pollutants in air is easy to contaminated equipment and fluid causes secondary pollution.The present invention is built into the locking system fully isolated with the external world by finished product fluid, filtrating equipment, detection facility etc. by corresponding pipeline liquid injecting device, solenoid valve etc., then utilize the corresponding connection mouth of airtight Special connecting device, pipeline and hydraulic equipment to be connected and sealed, because hydraulic equipment itself is also a closed system, therefore in the closed circuit that the whole working procedure of system all forms between hydraulic equipment, Special connecting device and native system, carry out, with the external world without any exchange.Build closed system except will be for the special oil storage system of system, also to guarantee that all parts in oil circuit do not produce leakage, native system has been selected leak free single twin-stage external gear pump, VX21,23 for this reason, 33 series electronic two are logical and tee ball valve, Sealing ball-valve, granule detecting instrument etc., realizes the airtight design of system by the seamless link by these parts (with extraneous without any exchange) and seamless control (noiseless, pollution mutually in state conversion process).
Two, vacuum oil-pumping, fuel loading system design.The general oil circuit complexity of hydraulic equipment, section of tubing is very fine and closely woven, uses manual filing provision, and not only contaminated oil discharge not exclusively, and easily causes at the filling process Air and enters fluid, makes filling not exclusively, and brings pollution to fluid in hydraulic equipment.The present invention has designed by vacuum pump sump oil case vacuum pumping method, at the oil drain out of hydraulic equipment, sets up certain negative pressure, makes pollution fluid wherein progressively be discharged into the sump oil case.Along with the minimizing of fluid in hydraulic equipment, degree of vacuum is more and more higher, and after degree of vacuum acquires a certain degree, the pollution fluid in hydraulic equipment and air venting totally, reach the purpose of discharge fully.In addition, also take full advantage of vacuum pump on conceptual design the fluid in the absolute oil case is vacuumized, the bubble in hydraulic oil is fully separated out, to reduce atmospheric pollution.After vacuum oil-pumping finishes, do not change the vacuum state of system, by controlling associated solenoid valve, associated loop is switched, can conveniently realize vacuum filling.For the assurance system can work under high vacuum state, absolute oil case and sump oil case adopt stainless steel pressure-bearing fuel tank, and pipeline has been selected the pressure-bearing flexible pipe.
Three, lube purification system.The fluid of new filling must be purified, and just can prevent the secondary pollution to Hydrauservo System; When hydraulic equipment suffers severe contamination, only have the cleaning through certain way could effectively reduce pollution.For the main cause that causes the hydraulic equipment oil circuit to stop up, be the characteristics of oil/liquid particle pollution, the present invention is connected in series a precise filtering device in working connection, fluid under the effect of gear pump with certain pressure and flow velocity by precision Filter element, make the particle that is greater than certain size in fluid progressively by filtering.When the system auto purification, this filtrating equipment is access in the absolute oil case, thereby realizes intending the purification of filling fluid; When hydraulic equipment is cleaned, this filtrating equipment becomes the fuel feeding district of a by-passing filter system access hydraulic equipment, thereby realizes the on-line cleaning to the hydraulic equipment oil circuit.Apparatus of the present invention can be controlled at the dustiness of fluid below the NAS-6 level, can reach the NAS-2 level.
Four, on-line detecting system design.Native system adopts the granule detecting instrument to carry out the online detection of contamination level of oil liquid, and owing to having adopted the inner looping testing scheme, test environment and conditional stability are constant, the test result good stability.
Five, automatic mode conceptual design: under automatic mode of the present invention, system can complete vacuum oil-pumping, oiling and on-line cleaning automatically, and without manual intervention, the operation of being more convenient for is used.
Claims (7)
1. the online oil filling of hydraulic equipment and purification plant, include fuel reserve tank, vacuumize control system, online circulated filter system, power-supply system, circuit control system, it is characterized in that on fuel reserve tank being provided with vacuumizing control system; Fuel reserve tank is divided into absolute oil case (13) and sump oil case (14), and absolute oil case (13) is provided with in-line, and sump oil case (14) is provided with fuel outlet valve (16); Described online circulated filter system includes the sump oil pipeline (25) linked with the sump oil case and the absolute oil pipeline (30) linked with the absolute oil case, be provided with sump oil solenoid electric valve (23) at the sump oil pipeline, the termination of sump oil pipeline (25) and absolute oil pipeline (30) be respectively equipped with can with contaminated-oil pipeline quick connector (24) and the absolute oil quick-mountable pipe jointer (1) of hydraulic equipment fuel tank UNICOM, the sump oil pipeline is connected by isolation solenoid valve (26), one-way valve (27), gear pump (10) with the absolute oil pipeline; Be provided with filter-press (4) in the absolute oil pipeline; In-line on absolute oil case (13) is provided with oil sucting valve (9), oil absorption filter (12) and solenoid electric valve (11); This device is provided with filling oil circulation filtration system, and the filter-press (4) of this system in described absolute oil case in-line, described gear pump (10), described absolute oil pipeline forms.
2. the online oil filling of hydraulic equipment according to claim 1 and purification plant, is characterized in that in described online circulated filter system being provided with granule detecting instrument (6).
3. the online oil filling of hydraulic equipment according to claim 1 and 2 and purification plant, is characterized in that described filter-press (4) is provided with clogging indicator (5)
.
4. the online oil filling of hydraulic equipment according to claim 1 and 2 and purification plant, it is characterized in that the described control system that vacuumizes, include vacuum pump (19), vacuum-pumping pipeline, be provided with on vacuum-pumping pipeline and control solenoid valve (20) and pressure-releasing electromagnetic valve (18), at the end of vacuum-pumping pipeline, be provided with air filter (22); Absolute oil case (13), sump oil case (14) are in parallel by unicom pipeline, are provided with Vacuum ball valve (15) in parallel pipeline.
5. the online oil filling of hydraulic equipment according to claim 2 and purification plant, is characterized in that described fuel reserve tank is provided with liquid level liquid temperature display device (17,29).
6. the online oil filling of hydraulic equipment according to claim 4 and purification plant, is characterized in that in described absolute oil pipeline being provided with filling pressure gauge (3).
7. the online oil filling of hydraulic equipment according to claim 5 and purification plant, is characterized in that in described sump oil pipeline arranging viewing window (28).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010144827 CN101865186B (en) | 2010-04-13 | 2010-04-13 | Online oil filling and purifying device for hydraulic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010144827 CN101865186B (en) | 2010-04-13 | 2010-04-13 | Online oil filling and purifying device for hydraulic equipment |
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| CN101865186A CN101865186A (en) | 2010-10-20 |
| CN101865186B true CN101865186B (en) | 2013-06-26 |
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| CN 201010144827 Expired - Fee Related CN101865186B (en) | 2010-04-13 | 2010-04-13 | Online oil filling and purifying device for hydraulic equipment |
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| DE3839268A1 (en) * | 1988-11-21 | 1990-05-23 | Kugelfischer G Schaefer & Co | Hydraulic compensating valve |
| CN2490351Y (en) * | 2001-07-26 | 2002-05-08 | 同济大学 | Automatic cleaning equipment for hydraulic system pipe line |
| CN201220229Y (en) * | 2008-05-12 | 2009-04-15 | 江苏恒力化纤有限公司 | On-line cleaning winding oil path oil supplying device |
-
2010
- 2010-04-13 CN CN 201010144827 patent/CN101865186B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0209019A2 (en) * | 1985-07-12 | 1987-01-21 | Vickers Incorporated | Hydraulic control system |
| DE3839268A1 (en) * | 1988-11-21 | 1990-05-23 | Kugelfischer G Schaefer & Co | Hydraulic compensating valve |
| CN2490351Y (en) * | 2001-07-26 | 2002-05-08 | 同济大学 | Automatic cleaning equipment for hydraulic system pipe line |
| CN201220229Y (en) * | 2008-05-12 | 2009-04-15 | 江苏恒力化纤有限公司 | On-line cleaning winding oil path oil supplying device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110879288A (en) * | 2018-09-05 | 2020-03-13 | 中国石油天然气股份有限公司 | Lubrication detection device |
| CN110879288B (en) * | 2018-09-05 | 2023-02-28 | 中国石油天然气股份有限公司 | Lubrication detection device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101865186A (en) | 2010-10-20 |
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