CN206339442U - Hydraulic pressure intelligently loads detection means - Google Patents

Hydraulic pressure intelligently loads detection means Download PDF

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Publication number
CN206339442U
CN206339442U CN201621164965.5U CN201621164965U CN206339442U CN 206339442 U CN206339442 U CN 206339442U CN 201621164965 U CN201621164965 U CN 201621164965U CN 206339442 U CN206339442 U CN 206339442U
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CN
China
Prior art keywords
pressure
bypass
valve
supply channel
water
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201621164965.5U
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Chinese (zh)
Inventor
刘子昂
胡志威
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Han Yu Sen Technology (wuhan) Co Ltd
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Han Yu Sen Technology (wuhan) Co Ltd
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Priority to CN201621164965.5U priority Critical patent/CN206339442U/en
Application granted granted Critical
Publication of CN206339442U publication Critical patent/CN206339442U/en
Expired - Fee Related legal-status Critical Current
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Abstract

The utility model is related to a kind of hydraulic pressure intelligently loading detection means, including the first supply channel supplied water to pressure testing cavity volume, first supply channel is provided with the first control valve, a pressure pipeline is connected with bypass on first supply channel and bypass tie point is located between the described first control valve and the first supply channel port of export, and the pressure pipeline, which is provided with, is used for the pressing mechanism to water stream S.The present apparatus can according to the different phase of pressure process, the not equal factor of different situations change and loading object in actual use, changes in flow rate etc. of pressure process is controlled by bypassing the pressure pipeline of connection, pressure-loaded precision can be effectively improved.

Description

Hydraulic pressure intelligently loads detection means
Technical field
The utility model is related to a kind of hydraulic pressure intelligently loading detection means, for the resistance to of pressure chamber, key components and parts etc. The intelligence loading detection of the closed containing cavity such as pressure loading detection and high pressure nacelle.
Background technology
The products such as key components and parts and pressure chamber that aviation operation, deep ocean work etc. are applied carry out compressive resistance survey Examination is the necessary guarantee of reliability of enhancing product performance, strengthen, and water (ordinary tap water, sea water and fresh water or high water base medium) conduct Wide material sources and free of contamination fluid and frequently as pressure-loaded medium.At present, conventional Water hydraulic static pressure loading mode generally existing adds The shortcomings of precision is not enough, automaticity is relatively low is carried, such as the open type hydraulic pressure system used at present, it is by the pressure setting of system Loaded to on-load pressure, the Stress control of this load mode depends on the precision of pressure regulator valve, want raising precision necessary Adoption rate pressure-control valve;And current, the still aqueous medium proportional pressure control valve without domestic dependable performance;In addition, opening Formula system is unfavorable for the pressure-resistant observation detection of pressure testing cavity volume, and causes water resource waste.
Under current intelligence manufacture and the overall background of industrial automation, current existing load mode can not meet pressure testing Object range wide (on-load pressure span is big, and volume excursion is wide), the requirement of intelligent Water hydraulic static pressure loading.
Utility model content
The utility model embodiment is related to a kind of hydraulic pressure intelligently loading detection means, can at least solve the part of prior art Defect.
The utility model embodiment is related to a kind of hydraulic pressure intelligently loading detection means, including first supplied water to pressure testing cavity volume Supply channel, first supply channel is connected with one provided with the first control valve, in bypass on first supply channel and added Pressure pipe road and bypass tie point be located at described first control valve and the first supply channel port of export between, the pressure pipeline Being provided with is used for the pressing mechanism to water stream S.
As one of embodiment, the pressing mechanism includes hydraulic cylinder, and the hydraulic cylinder correspondence is configured with a flat valve.
As one of embodiment, the hydraulic cylinder for can digit pulse pressurization digital hydraulic cylinder.
As one of embodiment, described first controls valve to use two-position two-way solenoid valve as the inserted valve of pilot valve, The two-position two-way solenoid valve port of export is connected with a water tank.
As one of embodiment, the pressure pipeline arrival end is connected with the water tank, and is set on the pressure pipeline Dynamic mechanism, the actuating unit is located between the pressing mechanism and the pressure pipeline arrival end.
As one of embodiment, intelligently loading detection means also includes central control unit and described for detecting to the hydraulic pressure The level detection mechanism of liquid level in water tank;The level detection mechanism is electrically connected with the input of the central control unit, institute The operating circuit, the operating circuit of the pressing mechanism and the first control valve for stating actuating unit are single with the center control The output end electrical connection of member.
As one of embodiment, the water tank is connected with water pipe, and the water pipe is provided with the second control valve, institute The second control valve is stated to electrically connect with the output end of the central controller.
As one of embodiment, the actuating unit includes plunger water pump, and one is connected with bypass on the pressure pipeline Pressure regulation is bypassed, and the bypass tie point of the pressure regulation bypass is located between the plunger water pump and the pressing mechanism, is adjusted in described Pressure bypass is provided with regulator valve, and the port of export of pressure regulation bypass is connected to the water tank.
As one of embodiment, a failure bypass is connected with also being bypassed on the pressure pipeline, the failure bypass Arrival end is located between the bypass tie point of pressure regulation bypass and the pressing mechanism, and the port of export of the failure bypass is located at Between the port of export of the pressure pipeline and the pressing mechanism, high-pressure ball valve is provided with the failure bypass.
As one of embodiment, the oriented pressure testing cavity volume of bypass connection quickly supplies water on first supply channel the Two supply channels, second supply channel is provided with low-voltage solenoid valve, and first supply channel is provided with high-pressure solenoid valve, The bypass tie point of first supply channel, the high-pressure solenoid valve and the first control valve are along water (flow) direction successively cloth Put.
The utility model embodiment at least has the advantages that:The present apparatus can according to the different phase of pressure process, The not equal factor of different situations change and loading object, is controlled by the pressure pipeline for bypassing connection in actual use Changes in flow rate of pressure process etc., can effectively improve pressure-loaded precision.
The further beneficial effect of the utility model embodiment is:By using can digit pulse pressurization digital hydraulic pressure Cylinder, you can be controlled to hydraulic cylinder by the way of digit pulse, realizes that digit pulse is pressurizeed, can be by changing pulse frequency Real-time change control is carried out to load traffic, loading velocity etc., can be according to needed for load phase and loading object does not enter on an equal basis The corresponding regulation of row, so as to ensure the high-precision control of loading procedure.
The further beneficial effect of the utility model embodiment is:Pilot valve is used as by using using two-position two-way solenoid valve Inserted valve, pressure testing cavity volume can be achieved builds automatically controlling for pressure and pressure release, simple in construction, operation and safeguards etc. all more convenient, Improve the automaticity of Water hydraulic static pressure loading detection work.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art Or the accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, drawings in the following description are only It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 intelligently loads the operation principle schematic diagram of detection means for the hydraulic pressure that the utility model embodiment is provided;
Fig. 2 intelligently loads the surface structure schematic diagram of detection means for the hydraulic pressure that the utility model embodiment is provided.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made The all other embodiment obtained, belongs to the scope of the utility model protection.
Such as Fig. 1, the utility model embodiment provides a kind of hydraulic pressure intelligently loading detection means, including is supplied water to pressure testing cavity volume The first supply channel 21, first supply channel 21 is provided with the first control valve 7, in other on first supply channel 21 Road is connected with a pressure pipeline 23 and bypass tie point is located at the described first control valve 7 and the port of export of the first supply channel 21 Between, the pressure pipeline 23, which is provided with, is used for the pressing mechanism to water stream S.Pass through above-mentioned first supply channel, 21 pairs of examinations Pressure-volume chamber carries out loading water supply, after the completion of being loaded in pressure testing cavity volume, closes above-mentioned first control valve 7, turns into pressure testing cavity volume One closing cavity volume, now starts to pressurize to pressure testing cavity volume, by above-mentioned pressing mechanism, will add by above-mentioned pressure pipeline 23 Current after pressure are progressively injected in pressure testing cavity volume, realize the pressurized operation to pressure testing cavity volume., can be according to pressurization using said structure The not equal factor of the different phase of process, in actual use different situations change and loading object, passes through above-mentioned side Changes in flow rate of the control pressure process of pressure pipeline 23 of road connection etc., can effectively improve pressure-loaded precision.Above-mentioned pressuring machine Structure can be using existing water-pressure booster pump (being preferably variable pump), hydraulic pressure pressure charging system etc., and in the present embodiment, such as Fig. 1 is above-mentioned Pressing mechanism preferably comprises hydraulic cylinder 9, further, and the hydraulic cylinder 9 correspondence is configured with a flat valve 11;The work of flat valve 11 With the motion for being the cooperation piston of hydraulic cylinder 9, the water sucking mouth of the hydraulic cylinder 9, delivery port and the inner chamber of hydraulic cylinder 9 are connect into on-off successively Open, so as to realize the flow of hydraulic cylinder 9;The attachment structure of above-mentioned flat valve 11, hydraulic cylinder 9 and capstan is that this area is conventional Technological means, be that those skilled in the art easily learn.It is further preferred that above-mentioned hydraulic cylinder 9 for can digit pulse add The digital hydraulic cylinder 9 of pressure, you can be controlled to hydraulic cylinder 9 by the way of digit pulse, is realized that digit pulse is pressurizeed, can led to Cross change pulse frequency and real-time change control is carried out to load traffic, loading velocity etc., according to needed for load phase and can load Object is not adjusted accordingly on an equal basis, so as to ensure the high-precision control of loading procedure.In the present embodiment, the digital hydraulic cylinder 9 equivalent impulse stroke in 50 microns, its loading frequency can between 0~2400Hz speed it is controllable;Above-mentioned digital hydraulic pressure Cylinder 9 is preferably to use single cylinder pump configuration.
Further optimize the structure of the intelligent loading detection means of above-mentioned hydraulic pressure, such as Fig. 1, the first control valve 7 is uses Two-position two-way solenoid valve 8 is as the inserted valve 7 of pilot valve, and the port of export of two-position two-way solenoid valve 8 is connected with a water tank 1.Adopt There is function, its concrete structure and the work such as overflow valve and unloading valve as the inserted valve 7 of pilot valve with two-position two-way solenoid valve 8 Principle is that those skilled in the art are readily apparent according to prior art, and here is omitted.Two-position two-way solenoid valve 8 is by returning Flow tube road (having illustrated, do not mark) is connected with water tank 1, and the return line is used as pressure release when overflow passage and pressure testing cavity volume pressure release Pipeline is used.Specifically, when above-mentioned first supply channel 21 loads water-filling to pressure testing cavity volume, pressure testing cavity volume is full of in aqueous medium Afterwards, aqueous medium can be via above-mentioned inserted valve 7 and return line overflow into water tank 1, so as to prevent the wasting of resources and prevent to examination Pressure-volume chamber is damaged;After aqueous medium is full of pressure testing cavity volume, above-mentioned two-position two-way solenoid valve 8 obtains electric, closes the valve port of inserted valve 7 Close, pressure testing cavity volume formation closing cavity volume, above-mentioned pressing mechanism (hydraulic cylinder 9) starts to pressurize to pressure testing cavity volume;It is pressurized to setting value And pressurize is to after setting time, the above-mentioned dead electricity of two-position two-way solenoid valve 8, above-mentioned inserted valve 7 i.e. as unloading valve, aqueous medium via The inserted valve 7 and return line reflow tank 1, the unloading of pressure testing cavity volume.By said structure can realize pressure testing cavity volume build pressure and Automatically controlling for pressure release, simple in construction, operation and maintenance etc. are all more convenient, improve the automation journey of Water hydraulic static pressure loading detection work Degree.In addition, when meeting the emergency cases such as the loss of power accident, pressure testing cavity volume pressure release can be also made by said structure, so as to ensure equipment Safety.
The above-mentioned hydraulic pressure that continues intelligently loads the structure of detection means, such as Fig. 1, the arrival end of pressure pipeline 23 and the water Case 1 is connected, and is provided with actuating unit in the pressure pipeline 23, and the actuating unit is located at the pressing mechanism and added with described Between the arrival end of pressure pipe road 23.The aqueous medium being back in water tank 1 can be used for the aqueous medium of pressure pipeline 23 to use, and this is certain Recycling for aqueous medium is realized in degree, resource consumption is reduced.For avoid in water tank 1 water level it is too low cause this hydraulic pressure intelligently plus Carry in the operation troubles of detection means, the present embodiment, preferably realize automatically controlling for the water level of water tank 1;Specifically, the hydraulic pressure Intelligence loading detection means also includes central control unit and the level detection mechanism for detecting liquid level in the water tank 1, liquid Position detecting mechanism is electrically connected with the input of central control unit;The water tank 1 is connected with water pipe 22, the water pipe 22 Provided with the second control valve 20, the second control valve 20 is electrically connected with the output end of the central controller.When crossing low water level, System-down;During low water level, above-mentioned second control valve 20 is opened, by above-mentioned water pipe 22 to the moisturizing of water tank 1;High water level When, above-mentioned second control valve 20 is closed, stops moisturizing.Above-mentioned second control valve 20 is preferably to use low-voltage solenoid valve, moisturizing effect Rate is of a relatively high;In addition, being provided with filter 2 on above-mentioned water pipe 22.
Further, automatically controlled by the water level of above-mentioned water tank 1, the water level of water tank 1 is alternatively arranged as pressure testing cavity volume water-filling It is vented the foundation of detection;Specifically, in pressure testing cavity volume water-filling exhaust phase, when above-mentioned level detection mechanism detects the water of water tank 1 (aqueous medium overflow is had when position rises), is illustrated to have been filled with aqueous medium in pressure testing cavity volume, can now be started to the pressure testing cavity volume Build pressure.Accordingly, the operating circuit of the actuating unit, the operating circuit of the pressing mechanism and described first control valve 7 (i.e. Above-mentioned use two-position two-way solenoid valve 8 as pilot valve inserted valve 7) output end with the central control unit is electrically connected Connect.Said structure further improves the automaticity of this Water hydraulic static pressure loading detection work.
The above-mentioned hydraulic pressure that continues intelligently loads the structure of detection means, and such as Fig. 1, above-mentioned actuating unit includes plunger water pump 4, in Bypass is connected with pressure regulation bypass 24 on the pressure pipeline 23, and the bypass tie point of the pressure regulation bypass 24 is located at the plunger Between water pump 4 and the pressing mechanism, regulator valve 5 is provided with pressure regulation bypass 24, and the pressure regulation bypasses 24 The port of export is connected to the water tank 1.Above-mentioned plunger water pump 4 is preferably to use high pressure plunger water pump 4, and it is connected with motor 3;It is above-mentioned The port of export of pressure regulation bypass 24 is preferably to be connected on above-mentioned return line.It is that pressure pipeline 23 is carried by above-mentioned actuating unit For high pressure aqueous medium.
It is further preferred that such as Fig. 1, in also bypass is connected with a failure bypass 25, the event on the pressure pipeline 23 The arrival end of barrier bypass 25 is located between bypass tie point and the pressing mechanism that the pressure regulation bypasses 24, the failure bypass 25 port of export is located between the port of export of the pressure pipeline 23 and the pressing mechanism, is provided with the failure bypass 25 High-pressure ball valve 10.Under normal service condition, above-mentioned high-pressure ball valve 10 is normally off;In host computer and above-mentioned pressing mechanism (water Cylinder pressure 9) when breaking down, above-mentioned high-pressure ball valve 10 is opened, according to shock-proof pressure gauge (not shown) and pressure on the number display table (not shown), adjusts above-mentioned regulator valve 5 manually, aqueous medium pressure is reached on-load pressure.
Further optimize other on the structure that above-mentioned hydraulic pressure intelligently loads detection means, such as Fig. 1, first supply channel 21 The second supply channel 17 that road connects that the oriented pressure testing cavity volume quickly supplies water (water-filling pipeline and pressure testing cavity volume not shown in Fig. 1 Connected relation), second supply channel 17 be provided with low-voltage solenoid valve 19, first supply channel 21 be provided with high pressure Magnetic valve 6, the bypass tie point of first supply channel 21, the high-pressure solenoid valve 6 and the first control valve 7 are along current Direction is sequentially arranged.Wherein, above-mentioned second supply channel 17 is used to carry out pressure testing cavity volume quick exhaust of supplying water, and above-mentioned first supplies Water lines 21 then be used for pressure testing cavity volume carry out at a slow speed supply water be vented, the two mutual cooperation, it is ensured that the operating efficiency of the present apparatus and The precision controlling of flow loading, to protect pressure testing cavity volume to be detected;For larger (such as pressure testing cavity volume volume of pressure testing cavity volume volume During more than 2000L) situation, above-mentioned using effect is more preferably.In addition, filter 2 is provided with above-mentioned first supply channel 21, the Configuration or not the configurating filtered device 2 may be selected on two supply channels 17.
In the present embodiment, by using above-mentioned pressing mechanism (digital hydraulic cylinder 9), using the conduct of two-position two-way solenoid valve 8 The structure such as the inserted valve 7 of pilot valve and the cooperation of the supply channel 17 of above-mentioned first supply channel 21 and second so that this hydraulic pressure intelligence Loading detection means is applied widely, loading accuracy is high, high degree of automation, and Operation and Maintenance etc. is all more convenient.It is above-mentioned to be related to To Automated condtrol process using existing conventional Automated condtrol program be that can be achieved, without programming in addition.
It is further preferred that such as Fig. 2, intelligently loading detection means uses case structure to the hydraulic pressure that the present embodiment is provided, i.e., Above-mentioned actuating unit, above-mentioned pressing mechanism, above-mentioned first control valve 7 etc. are integrated in a casing 100, the case structure is preferred To be connected by rotating disk flexible pipe 104 with pressure testing cavity volume.This detection means can connect multiple pressure testing cavity volumes, such as Fig. 1, the present embodiment In, above-mentioned rotating disk flexible pipe 104 includes the loading pipeline 15 of two groups of small latus rectums of high pressure (i.e. with 21 pairs above-mentioned of the first supply channel Should) and one group of low pressure big orifice rapid water filling pipeline 17 (corresponding to the second above-mentioned supply channel 17).Wherein, on two groups State on loading pipeline 15, along water (flow) direction, be disposed with high-pressure ball valve 10, pressure measurement exhaust joint 12, high-pressure pressure sensor 13rd, low pressure sensor 14 and hydraulic quick coupler 16;On above-mentioned rapid water filling pipeline, along water (flow) direction, low pressure ball is disposed with Valve 18, pressure measurement exhaust joint 12, high-pressure pressure sensor 13 and hydraulic quick coupler 16.Certainly, when actually used, however it is not limited to above-mentioned Structure, those skilled in the art can carry out respective change according to actually used situation and demand.
Further, display screen 101, control button 103, display instrument 102 etc. are integrated with above-mentioned casing 100, be easy to Operation and observation.Intelligently loading detection means can realize remote control, local operation and manual adjustment to this hydraulic pressure, correspondence is long-range, On the spot, manual Three models.Concrete operation method is as follows:
When the mode selecting button of the intelligent loading detection means of hydraulic pressure is beaten when long-range, after startup power supply, manual confirmation is full Sufficient loading environment, presses load button, then can complete load test according to the sets requirement of host computer, result of the test is returned automatically Return, and autostop is unloaded.
When the mode selecting button that hydraulic pressure intelligently loads detection means is beaten on the spot, on-load pressure is in touch control flow After 101 are provided with, startup, loading, unloading, shutdown etc. can carry out button operation on the spot.Now, host computer is sent at instruction In masked state.
When the mode selecting button of the intelligent loading detection means of hydraulic pressure is beaten when manual, the high pressure in opening failure bypass 25 Ball valve 10, regulation regulator valve 5, shows that table carries out manual loading according to shock-proof pressure gauge and pressure on the number manually.Now, on Position machine sends instruction and is in masked state.
No matter hydraulic pressure intelligently loads which kind of pattern is detection means be in, and when there is unexpected accident, takes scram button, system Shut down off-load, pressure testing cavity volume pressure release.SR is pressed, can again restart and use.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model Within the spirit and principle of utility model, any modifications, equivalent substitutions and improvements made etc. should be included in the utility model Protection domain within.

Claims (10)

1. a kind of hydraulic pressure intelligently loads detection means, it is characterised in that:Including the first supply channel supplied water to pressure testing cavity volume, institute The first supply channel is stated provided with the first control valve, a pressure pipeline and bypass are connected with bypass on first supply channel Tie point be located at described first control valve and the first supply channel port of export between, the pressure pipeline be provided be used for pair The pressing mechanism of water stream S.
2. hydraulic pressure as claimed in claim 1 intelligently loads detection means, it is characterised in that:The pressing mechanism includes hydraulic pressure Cylinder, the hydraulic cylinder correspondence is configured with a flat valve.
3. hydraulic pressure as claimed in claim 2 intelligently loads detection means, it is characterised in that:The hydraulic cylinder is can digit pulse The digital hydraulic cylinder of pressurization.
4. hydraulic pressure as claimed in claim 1 intelligently loads detection means, it is characterised in that:Described first controls valve to use two Position two-way electromagnetic valve is as the inserted valve of pilot valve, and the two-position two-way solenoid valve port of export is connected with a water tank.
5. hydraulic pressure as claimed in claim 4 intelligently loads detection means, it is characterised in that:The pressure pipeline arrival end and institute State water tank connection, and in the pressure pipeline be provided with actuating unit, the actuating unit be located at the pressing mechanism with it is described Between pressure pipeline arrival end.
6. hydraulic pressure as claimed in claim 5 intelligently loads detection means, it is characterised in that:Also include central control unit and use In the level detection mechanism for detecting liquid level in the water tank;The input of the level detection mechanism and the central control unit Electrical connection, the operating circuit of the actuating unit, the operating circuit of the pressing mechanism and it is described first control valve with it is described The output end electrical connection of central control unit.
7. hydraulic pressure as claimed in claim 6 intelligently loads detection means, it is characterised in that:The water tank is connected with filling pipe Road, the water pipe is electrically connected provided with the second control valve, the second control valve with the output end of the central controller.
8. hydraulic pressure as claimed in claim 5 intelligently loads detection means, it is characterised in that:The actuating unit includes plunger water Pump, pressure regulation bypass is connected with bypass on the pressure pipeline, and the bypass tie point of the pressure regulation bypass is located at the plunger Between water pump and the pressing mechanism, regulator valve, and the port of export of pressure regulation bypass are provided with pressure regulation bypass It is connected to the water tank.
9. hydraulic pressure as claimed in claim 8 intelligently loads detection means, it is characterised in that:In also being bypassed on the pressure pipeline A failure bypass is connected with, the arrival end of the failure bypass is located at bypass tie point and the pressuring machine that the pressure regulation is bypassed Between structure, the port of export of the failure bypass is located between the port of export of the pressure pipeline and the pressing mechanism, in described Failure bypass is provided with high-pressure ball valve.
10. hydraulic pressure as claimed in claim 1 intelligently loads detection means, it is characterised in that:It is other on first supply channel Road connects the second supply channel that the oriented pressure testing cavity volume quickly supplies water, and second supply channel is provided with low voltage electromagnetic Valve, first supply channel is provided with high-pressure solenoid valve, the bypass tie point of first supply channel, the high-voltage electromagnetic Valve and the first control valve are sequentially arranged along water (flow) direction.
CN201621164965.5U 2016-10-25 2016-10-25 Hydraulic pressure intelligently loads detection means Expired - Fee Related CN206339442U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201621164965.5U CN206339442U (en) 2016-10-25 2016-10-25 Hydraulic pressure intelligently loads detection means

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201621164965.5U CN206339442U (en) 2016-10-25 2016-10-25 Hydraulic pressure intelligently loads detection means

Publications (1)

Publication Number Publication Date
CN206339442U true CN206339442U (en) 2017-07-18

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Application Number Title Priority Date Filing Date
CN201621164965.5U Expired - Fee Related CN206339442U (en) 2016-10-25 2016-10-25 Hydraulic pressure intelligently loads detection means

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108457917A (en) * 2018-04-20 2018-08-28 武汉船用机械有限责任公司 A kind of water tightness detection device and its hydraulic system
CN108514487A (en) * 2018-01-23 2018-09-11 西南医科大学附属医院 Single pressure oxygen therapeutic device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108514487A (en) * 2018-01-23 2018-09-11 西南医科大学附属医院 Single pressure oxygen therapeutic device
CN108457917A (en) * 2018-04-20 2018-08-28 武汉船用机械有限责任公司 A kind of water tightness detection device and its hydraulic system
CN108457917B (en) * 2018-04-20 2020-01-31 武汉船用机械有限责任公司 water tightness detection device and hydraulic system thereof

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Granted publication date: 20170718

Termination date: 20181025