CN2672643Y - Pulse test table for hydraulic soft tube assembly - Google Patents

Pulse test table for hydraulic soft tube assembly Download PDF

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Publication number
CN2672643Y
CN2672643Y CN 200320125688 CN200320125688U CN2672643Y CN 2672643 Y CN2672643 Y CN 2672643Y CN 200320125688 CN200320125688 CN 200320125688 CN 200320125688 U CN200320125688 U CN 200320125688U CN 2672643 Y CN2672643 Y CN 2672643Y
Authority
CN
China
Prior art keywords
hydraulic
oil
valve
hose assembly
main
Prior art date
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
CN 200320125688
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Chinese (zh)
Inventor
陈瑞
周然
王克文
王福山
朱熙耕
雷江河
陈建长
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TIANJIN JINGYAN CONSTRUCTION MACHINERY TRANSMISSION CO Ltd
Original Assignee
TIANJIN JINGYAN CONSTRUCTION MACHINERY TRANSMISSION CO Ltd
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Filing date
Publication date
Application filed by TIANJIN JINGYAN CONSTRUCTION MACHINERY TRANSMISSION CO Ltd filed Critical TIANJIN JINGYAN CONSTRUCTION MACHINERY TRANSMISSION CO Ltd
Priority to CN 200320125688 priority Critical patent/CN2672643Y/en
Application granted granted Critical
Publication of CN2672643Y publication Critical patent/CN2672643Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model relates to a pulse test table for hydraulic soft tube assembly which belongs to the technical field of fluid transmission and control. An electric control device controls a hydraulic device, and the hydraulic device is composed of a main hydraulic system and a subsidiary hydraulic system. The high pressure oil path of the main hydraulic system is crossly communicated with the two ends of the supercharger by a reversing valve. The high pressure oil path of the main hydraulic system is connected with an unloading oil changing valve whose oil path is communicated with a liquid controlled throttle oil changing valve. The high temperature oil path of the subsidiary hydraulic system is communicated with an oil-return path after going through the supercharger, the test soft tube assembly and the liquid controlled throttle oil changing valve. A liquid level controller is arranged in the oil tank of the subsidiary hydraulic system. The pulse test table for hydraulic soft tube assembly can stop attacking the hydraulic soft tube assembly at any time, and the high-pressure oil can not eject out when the hydraulic soft tube assembly is disassembled and assembled. When the hydraulic soft tube assembly bursts, the system can automatically stop. Thus the pulse test table for hydraulic soft tube assembly is safe and reliable to use, and convenient to operate.

Description

Hydraulic hose assembly pulse testing platform
Technical field
The utility model belongs to the Fluid Transmission and Control technical field, particularly relates to a kind of hydraulic hose assembly pulse testing platform.
Background technology
" ISO6605 hydraulic hose and hose assembly test method " and " GB7939-92 hydraulic hose assembly test method " requires the carry out fatigue lifetime examination of hydraulic hose assembly under the pulse effect.Testing requirements applies oil temperature 93 ± 3 ℃ of pulses (pulse waveform such as accompanying drawing 6) with the frequency between 0.5Hz~1.25Hz in flexible pipe, trough pressure is 0~1000kPa, the pressure climbing speed should be between 100Mpa/s~350Mpa/s, and crest pressure is test pressure ± 5%.
At present, the above-mentioned functions of existing hydraulic hose assembly pulse testing platform is finished (as accompanying drawing 5) by main system and backup system co-ordination, at first main system fluid enters the rod chamber of supercharger 32 through reversal valve 36 right positions, the promotion intensifier piston moves to left, backup system is input to high-temperature oil liquid in supercharger 32 loculuses and the hydraulic hose assembly 33 simultaneously, hydraulic control one-way valve 34 is in opening under main system pressure oil B control, high-temperature oil liquid is through hydraulic hose assembly 33, behind the hydraulic control one-way valve 34, produce certain back pressure by meter out valve 35, thereby, the trough of formation pulse waveform; Then, under the electrical apparatus control system effect, reversal valve 36 commutations are to position, a left side.The fluid of main system enters supercharger 32 big chambeies, pressure oil A shunting simultaneously enters hydraulic control one-way valve 34, retaining valve 34 is shut, main system pressure oil promotes supercharger 32 pistons and moves right, so supercharger is with the oil pressure supercharging of loculus, the high several times of its pressure ratio main system output pressure, the crest of formation pulse waveform.Finish a pulse cycle thus.
This system in use finds to exist two problems:
1. when stopping hydraulic hose assembly being impacted, need the controlling electric device gauge tap to make reversal valve 36 be in meta, when if reversal valve 36 commutates to meta by position, a left side, supercharger 32 is in pressurized state (being to be high pressure in the hydraulic hose assembly), if dismounting this moment hydraulic hose assembly, high temperature high pressure oil discharges will jeopardize life safety, therefore, when testing table stops to impact, when needing the operator to observe main system tensimeter 34 for low pressure, must rapid control apparatus switch.Operation is extremely inconvenient.
2. hydraulic hose assembly is under the pulse effect, carry out torture test, in case hydraulic hose assembly explosion, operating personnel operate untimely, backup system Oil pump electrical machinery group is still worked, to cause the fluid in the service tank all to be discharged in the experiment cabinet, and cause the suction sky of hydraulic pump, and break down.
Summary of the invention
The utility model provides a kind of hydraulic hose assembly pulse testing platform for solving the technical matters that exists in the known technology.
The utility model is by being provided with off-load reversal valve, fluid level controller and electric-control system co-ordination; automatically stop backup system Oil pump electrical machinery group function when automatic deloading when the realization hydraulic hose assembly stops to impact automatically and hydraulic hose assembly explosion, all providing a kind of novel hydraulic hose assembly pulse testing platform with automatic deloading and defencive function.
The automatic deloading principle as shown in Figure 1 when hydraulic hose assembly stopped to impact.Its core is to have increased off-load reversal valve 8, when stopping hydraulic hose assembly being impacted, the controlling electric device gauge tap makes electro-hydraulic reversing valve 3 be in meta, 8 commutations of the reversal valve of off-load simultaneously, this moment, main pump motor group 1 pressure oil output was by off-load reversal valve 8, the control chamber that enters hydraulic control throttled directional valve 10 makes its unlatching, high temperature high pressure liquid in the hydraulic hose assembly flows back to the backup system fuel tank by hydraulic control throttled directional valve 10, reach hydraulic hose assembly release purpose, when having avoided the dismounting hydraulic hose assembly, high liquid hydraulic oil discharges and jeopardizes the life security incident.Its concrete (construction) design is as accompanying drawing 2 and accompanying drawing 3, it is made up of one-way throttle valve 13, control stack piece 14, electro-hydraulic reversing valve 15, drain charge reversal valve 16, surplus valve 17, retaining valve 20, main valve piece 21 etc., wherein off-load reversal valve 16 is connected between electro-hydraulic reversing valve 15 and the one-way throttle valve 13 by control stack piece 14, is processed with control port 22,23 on the control Sandwich plate valve piece 14 and is connected with hydraulic control throttling oil-changing valve.
Automatically protect by the variation that in the backup system fuel tank, increases fluid level controller 12 (accompanying drawing 1) perception oil tank liquid level during the hydraulic hose assembly explosion and control stopping of auxiliary oil pump group of motors.Electrical apparatus control system such as accompanying drawing 4, when the liquid level of fuel tank is lower than the value of fluid level controller 28 settings, the contacting of fluid level controller 28, relay 29 gets simultaneously, the normally opened contact closure of KA1, the shunt opening trip coil of isolating switch 30 is connected, and isolating switch 30 cuts off automatically, and getting in touch of electrical operating station and power supply is cut off all controls and stops at this moment.Avoid the fluid in the service tank all to be discharged in the experiment cabinet, and caused fault.
The utility model is taked following technical scheme:
Hydraulic hose assembly pulse testing platform is made of electrical control gear, hydraulic means, the reversal valve of electrical control gear control hydraulic means, and its hydraulic means is made up of main hydraulic system and auxiliary hydraulic system.After the reversal valve commutation, the fluid of main hydraulic system mesohigh Oil pump electrical machinery group output is communicated with an end hydraulic fluid port of supercharger through reversal valve, and the other end hydraulic fluid port of supercharger is communicated with oil return line through reversal valve; High temperature oil pump group of motors output fluid is communicated with oil return line in the auxiliary hydraulic system after retaining valve enters supercharger loculus, test hose assembly and hydraulic control throttling oil-changing valve; The main hydraulic system high-pressure oil passage is connected with the off-load oil-changing valve, and the oil circuit of off-load oil-changing valve is connected with hydraulic control throttling oil-changing valve.In the fuel tank of auxiliary hydraulic system fluid level controller is housed.
The utility model can also adopt following technical measures:
Described hydraulic hose assembly pulse testing platform, the high-pressure oil passage of its main hydraulic system is communicated with the two ends hydraulic fluid port of supercharger through one-way throttle valve after the reversal valve commutation.
Described hydraulic hose assembly pulse testing platform, its auxiliary hydraulic system high temperature oil circuit is communicated with oil return line behind retaining valve, supercharger loculus, test hose assembly and hydraulic control throttling oil-changing valve.
Described hydraulic hose assembly pulse testing platform is equipped with fluid level controller in the fuel tank of its auxiliary hydraulic system, and fluid level controller is connected and composed by sensor, relay and isolating switch.
Advantage and the good effect that the utlity model has are: this hydraulic hose assembly pulse testing platform fully can be by " ISO6605 hydraulic hose and hose assembly test method " and " GB7939-92 hydraulic hose assembly test method " requirement to the carry out fatigue lifetime examination of hydraulic hose assembly under the pulse effect.Allow to stop at any time hydraulic hose assembly is impacted, and can not produce the hydraulic oil ejection during dismounting hydraulic hose assembly.Hydraulic hose assembly carries out torture test, in case the hydraulic hose assembly explosion, system can stop automatically, prevents that effectively the oil in the service tank is discharged to the suction sky of experiment cabinet and hydraulic pump.The utility model is safe and reliable, and is easy to operate.
Description of drawings
Fig. 1 is the utility model hydraulic system synoptic diagram;
Fig. 2 is the utility model reversal valve, one-way throttle valve, off-load oil-changing valve assembling unit structure synoptic diagram;
Fig. 3 is Fig. 2 left side TV structure synoptic diagram;
Fig. 4 is the fluid level controller circuit diagram;
Fig. 5 is existing hydraulic hose assembly pulse testing platform synoptic diagram;
Fig. 6 is a hydraulic hose assembly pulse testing pulse waveform synoptic diagram.
Among the figure: 1-main pump motor group, 2-retaining valve, 3-electro-hydraulic reversing valve, 4-one-way throttle valve, the 5-supercharger, 6-intensifier piston, 7-one-way throttle valve, 8-off-load reversal valve, 9-hydraulic hose assembly, 10-hydraulic control throttling oil-changing valve, 11-auxiliary oil pump group of motors, 12-fluid level controller, 13-one-way throttle valve, 14-control stack piece, 15-electro-hydraulic reversing valve, 16-surplus valve, the 17-surplus valve, the 18-accumulator connects hydraulic fluid port, the long-range pressure modulating opening of 19-, the 20-retaining valve, 21-main valve piece, 22-control port, 23-control port, 24-main system oil-in, the 25-supercharger connects hydraulic fluid port, the 26-oil return opening, the 27-supercharging connects hydraulic fluid port, 28-floating ball lever meter, the 29-relay, 30-isolating switch, 31-scram button, the 32-supercharger, the 33-hydraulic hose is total, the 34-hydraulic control one-way valve, the 35-throttling valve, 36-reversal valve, 37-tensimeter.
Embodiment
For further understanding summary of the invention of the present utility model, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:
Consult Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6.
Hydraulic hose assembly pulse testing platform is made up of hydraulic system, electrical control cabinet and computer testing system, experiment cabinet three parts.Important technological parameters is: high impulse pressure 64Mpa; Pulsed frequency 0.5~1.25Hz is adjustable; The basic square wave of pulse waveform; 100 ± 5 ℃ of test oil temperature are automatic controlled; The test specimen mounting means is 180 ° or 90 °; The main pump Pmax=16Mpa of oil sources pump, Q=75L/min.
Hydraulic hose assembly pulse testing platform is made of electrical control gear, hydraulic means, reversal valve 3, the off-load reversal valve 8 of electrical control gear control hydraulic means, its hydraulic means is made up of main hydraulic system and auxiliary hydraulic system, the high-pressure oil passage of main hydraulic system is behind main pump motor group 1, retaining valve 2, reversal valve 3, be communicated with the two ends commutation of supercharger 5 through one-way throttle valve 4 or one-way throttle valve 7, the reversal valve oil return is communicated with fuel tank; Auxiliary hydraulic system high temperature oil circuit is communicated with oil return line and flows back to fuel tank after auxiliary oil pump group of motors 11, retaining valve enter supercharger 5 loculuses, test hose assembly 9 and hydraulic control throttling oil-changing valve 10; The high-pressure oil passage of main hydraulic system is connected with off-load oil-changing valve 8, and the oil circuit of off-load oil-changing valve 8 is connected with hydraulic control throttling oil-changing valve 10; Fluid level controller 12 is housed in the fuel tank of auxiliary hydraulic pressure mechanism, and fluid level controller is connected and composed by floating ball lever meter 28, relay 29 and isolating switch 30, halt system work behind the interlock, and halt circuit is provided with scram button 31.
The specific design of reversal valve, one-way throttle valve, off-load oil-changing valve subassembly such as accompanying drawing 2 and accompanying drawing 3.It is made up of one-way throttle valve 13, control stack piece 14, electro-hydraulic reversing valve 15, off-load reversal valve 16, surplus valve 17, retaining valve 20, main valve piece 21 etc., wherein off-load reversal valve 16 is connected between electro-hydraulic reversing valve 15 and the one-way throttle valve 13 by controlling stack piece 14, is processed with accumulator on control Sandwich plate valve piece 14, the main valve piece 21 and connects hydraulic fluid port 18, remote control hydraulic fluid port 19, control port 22, control port 23, important coefficient oil-in 24, supercharger connection hydraulic fluid port 25, oil return opening 26, supercharger connection hydraulic fluid port 27.
The course of work: the hydraulic hose assembly pulse testing is finished by main system and backup system co-ordination.Main system fluid enters the P hydraulic fluid port of reversal valve 3 through main pump motor group 1, retaining valve 2.When electrical apparatus control system control electro-hydraulic reversing valve 3 is in right, oil is through entering the rod chamber of supercharger 5 through the right position of reversal valve 3 and one-way throttle valve 7, promoting intensifier piston 6 moves to left, backup system is input to high-temperature oil liquid in supercharger 5 loculuses and the hydraulic hose assembly 9 simultaneously, hydraulic control throttling oil-changing valve 10 is in opening under main system pressure oil B control, high-temperature oil liquid produces certain back pressure through hydraulic hose assembly 9, hydraulic control throttling oil-changing valve 10 backs, thereby, the trough of formation pulse waveform; Then, under the electrical apparatus control system effect, electro-hydraulic reversing valve 3 commutations are to position, a left side.The fluid of main system enters supercharger 5 big chambeies behind one-way throttle valve 4, pressure oil A shunting simultaneously enters hydraulic control throttling oil-changing valve 10, hydraulic control throttling oil-changing valve 10 is closed, main system pressure oil promotes supercharger 5 pistons 6 and moves right, so supercharger is with the oil pressure supercharging of loculus, the high several times of its pressure ratio main system output pressure, the crest of formation pulse waveform.Finish a pulse cycle thus, its pulse waveform such as accompanying drawing 6.
When needs stop hydraulic hose assembly being impacted, owing to increased off-load reversal valve 8, the controlling electric device gauge tap makes electro-hydraulic reversing valve 3 be in meta, 8 commutations of the reversal valve of off-load simultaneously, this moment, main pump motor group 1 pressure oil output was by off-load reversal valve 8, the control chamber that enters hydraulic control throttled directional valve 10 makes its unlatching, high temperature high pressure liquid in the hydraulic hose assembly flows back to the backup system fuel tank by hydraulic control throttled directional valve 10, reach hydraulic hose assembly release purpose, when having avoided the dismounting hydraulic hose assembly, high liquid oil discharges and jeopardizes the life security incident.
Automatically protect variation cut-out testing table always to advance during the hydraulic hose assembly explosion by in the backup system fuel tank, increasing fluid level controller 12 perception oil tank liquid levels.When the liquid level of fuel tank is lower than the value of fluid level controller 28 settings, the contacting of fluid level controller 28, relay 29 gets simultaneously, the normally opened contact of KA1 close and, the shunt opening trip coil of isolating switch 30 is connected, isolating switch 30 cuts off automatically, the getting in touch and be cut off all controls and stop of this moment electrical operating station and power supply.Avoid the fluid in the service tank all to be discharged in the experiment cabinet, and caused fault.

Claims (4)

1, a kind of hydraulic hose assembly pulse testing platform, constitute by electrical control gear, hydraulic means, electro-hydraulic reversing valve, the off-load reversal valve of electrical control gear control hydraulic means, it is characterized in that: hydraulic means is made up of main hydraulic system and auxiliary hydraulic system, and the high-pressure oil passage of main hydraulic system is communicated with the two ends commutation of supercharger (5) through electro-hydraulic reversing valve (3); The high-pressure oil passage of main hydraulic system is connected with off-load oil-changing valve (8).
2, a kind of hydraulic hose assembly pulse testing platform, constitute by electrical control gear, hydraulic means, electro-hydraulic reversing valve, the off-load reversal valve of electrical control gear control hydraulic means, it is characterized in that: hydraulic means is made up of main hydraulic system and auxiliary hydraulic system, auxiliary hydraulic system high temperature oil circuit is communicated with oil return line behind supercharger (5), test hose assembly (9) and hydraulic control throttling oil-changing valve (10); Fluid level controller (12) is housed in the fuel tank of auxiliary hydraulic system.
3, hydraulic hose assembly pulse testing platform according to claim 1, it is characterized in that: the high-pressure oil passage of main hydraulic system is connected with off-load oil-changing valve (8), and the oil circuit of off-load oil-changing valve (8) is connected with hydraulic control throttling oil-changing valve (10).
4, hydraulic hose assembly pulse testing platform according to claim 1 is characterized in that: auxiliary hydraulic system high temperature oil circuit is communicated with oil return line behind supercharger (5), test hose assembly (9) and hydraulic control throttling oil-changing valve (10); Fluid level controller (12) is housed in the fuel tank of auxiliary hydraulic system, and fluid level controller (12) is connected and composed by sensor (28), relay (29) and isolating switch (30).
CN 200320125688 2003-12-10 2003-12-10 Pulse test table for hydraulic soft tube assembly Expired - Fee Related CN2672643Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200320125688 CN2672643Y (en) 2003-12-10 2003-12-10 Pulse test table for hydraulic soft tube assembly

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Application Number Priority Date Filing Date Title
CN 200320125688 CN2672643Y (en) 2003-12-10 2003-12-10 Pulse test table for hydraulic soft tube assembly

Publications (1)

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102011766A (en) * 2010-11-15 2011-04-13 陕西飞机工业(集团)有限公司 Pressure-resistance and adjustment test bed for aircraft hydraulic system
CN101672747B (en) * 2009-10-15 2011-04-20 徐州天地重型机械制造有限公司 Hydraulic hose performance test experiment table
CN102261536A (en) * 2011-05-18 2011-11-30 长沙中联重工科技发展股份有限公司 Quick change connector device for hose assembly pressure test and hose assembly pressure test system
CN102445399A (en) * 2011-12-12 2012-05-09 麦格思维特(上海)流体工程有限公司 Pulse test bench and pressurizer
CN103016453A (en) * 2012-12-14 2013-04-03 浙江大学 Impulse test system of hydraulic hose
CN103644170A (en) * 2013-11-28 2014-03-19 江西洪都航空工业集团有限责任公司 Hydraulic low-pressure pulse experiment method of aircraft
CN104011440A (en) * 2011-12-20 2014-08-27 盖茨公司 High pressure and temperature valve
CN104007031A (en) * 2014-05-26 2014-08-27 格力电器(武汉)有限公司 Volume device pulse experiment equipment and control method thereof
CN104454688A (en) * 2014-11-17 2015-03-25 中色科技股份有限公司 Roll feeding and discharging trolley hydraulic station
CN105181475A (en) * 2015-10-28 2015-12-23 四川杰特机器有限公司 Impulse test system supercharged through servo electric cylinder
CN105445111A (en) * 2015-12-30 2016-03-30 北京汽车研究总院有限公司 Experimental equipment for testing hose
CN105716963A (en) * 2016-04-28 2016-06-29 北京中汽寰宇机动车检验中心有限公司 Comprehensive testing system for high-temperature pulse of steering power hose of motor vehicle
CN105716822A (en) * 2016-01-28 2016-06-29 武汉信测标准技术服务有限公司 Control method and device for low-pressure pulse duration test of automobile part
CN106351899A (en) * 2016-11-11 2017-01-25 三汽车制造有限公司 Auxiliary hydraulic pressure system and pumping machine
CN106837934A (en) * 2017-03-28 2017-06-13 台州学院 Thermostatically controlled hydraulic hose pulse test bench

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101672747B (en) * 2009-10-15 2011-04-20 徐州天地重型机械制造有限公司 Hydraulic hose performance test experiment table
CN102011766B (en) * 2010-11-15 2012-10-10 陕西飞机工业(集团)有限公司 Pressure-resistance and adjustment test bed for aircraft hydraulic system
CN102011766A (en) * 2010-11-15 2011-04-13 陕西飞机工业(集团)有限公司 Pressure-resistance and adjustment test bed for aircraft hydraulic system
CN102261536B (en) * 2011-05-18 2013-06-05 中联重科股份有限公司 Quick change connector device for hose assembly pressure test and hose assembly pressure test system
CN102261536A (en) * 2011-05-18 2011-11-30 长沙中联重工科技发展股份有限公司 Quick change connector device for hose assembly pressure test and hose assembly pressure test system
CN102445399A (en) * 2011-12-12 2012-05-09 麦格思维特(上海)流体工程有限公司 Pulse test bench and pressurizer
US9285036B2 (en) 2011-12-20 2016-03-15 Gates Corporation High pressure and temperature valve
CN104011440A (en) * 2011-12-20 2014-08-27 盖茨公司 High pressure and temperature valve
CN103016453A (en) * 2012-12-14 2013-04-03 浙江大学 Impulse test system of hydraulic hose
CN103644170A (en) * 2013-11-28 2014-03-19 江西洪都航空工业集团有限责任公司 Hydraulic low-pressure pulse experiment method of aircraft
CN103644170B (en) * 2013-11-28 2016-05-11 江西洪都航空工业集团有限责任公司 A kind of test method of airplane hydraulic pressure action of low-voltage pulse
CN104007031A (en) * 2014-05-26 2014-08-27 格力电器(武汉)有限公司 Volume device pulse experiment equipment and control method thereof
CN104454688A (en) * 2014-11-17 2015-03-25 中色科技股份有限公司 Roll feeding and discharging trolley hydraulic station
CN105181475B (en) * 2015-10-28 2018-04-20 四川杰特机器有限公司 A kind of impulse test system of servo electric jar supercharging
CN105181475A (en) * 2015-10-28 2015-12-23 四川杰特机器有限公司 Impulse test system supercharged through servo electric cylinder
CN105445111A (en) * 2015-12-30 2016-03-30 北京汽车研究总院有限公司 Experimental equipment for testing hose
CN105716822A (en) * 2016-01-28 2016-06-29 武汉信测标准技术服务有限公司 Control method and device for low-pressure pulse duration test of automobile part
CN105716963A (en) * 2016-04-28 2016-06-29 北京中汽寰宇机动车检验中心有限公司 Comprehensive testing system for high-temperature pulse of steering power hose of motor vehicle
CN105716963B (en) * 2016-04-28 2019-04-12 中机寰宇认证检验有限公司 A kind of motor turning power hose high temperature pulse integrated test system
CN106351899A (en) * 2016-11-11 2017-01-25 三汽车制造有限公司 Auxiliary hydraulic pressure system and pumping machine
CN106837934A (en) * 2017-03-28 2017-06-13 台州学院 Thermostatically controlled hydraulic hose pulse test bench

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20050119

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