CN106837934A - Thermostatically controlled hydraulic hose pulse test bench - Google Patents
Thermostatically controlled hydraulic hose pulse test bench Download PDFInfo
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- CN106837934A CN106837934A CN201710194129.4A CN201710194129A CN106837934A CN 106837934 A CN106837934 A CN 106837934A CN 201710194129 A CN201710194129 A CN 201710194129A CN 106837934 A CN106837934 A CN 106837934A
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- hydraulic hose
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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- Engineering & Computer Science (AREA)
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- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to hydraulic technique, more particularly to a kind of thermostatically controlled hydraulic hose pulse test bench, including electric-control system, pulse loading system, oil-supplementing system, tested hydraulic hose connection valve block.Tested hydraulic hose is connected by hydraulic control one-way valve with the high temperature fuel tank of oil-supplementing system, and hydraulic control one-way valve is opened and closed according to the oil temperature in tested flexible pipe, and B mouthfuls of pulse loading system pressurized cylinder directly connects main fuel tank.Oil liquid temperature control uses the close-loop control mode of hydraulic control one-way valve combination temperature sensor, the stabilization of oil liquid temperature when ensure that pulse testing, and hydraulic control one-way valve is only opened when oil liquid temperature increases to over test requirements document after multiple pulses impact, keying frequency is reduced, its service life is improve.The features such as this testing stand has low simple structure, energy consumption, dependable performance, long service life.
Description
Technical field
Temperature controlled energy-saving hydraulic flexible pipe can be carried out the present invention relates to a kind of hydraulic hose testing stand, especially one kind
Pulse pressure testing table.
Background technology
Hydraulic hose is widely used in hydraulic system.During hydraulic work system, due to hydraulic impulse or heating
Etc. reason, often cause the destruction or failure of hydraulic hose.Therefore, hydraulic hose is tested, in simulation actual condition
Various hydraulic impulses and high temperataure phenomena, for ensure hydraulic system safe operation it is significant.
According to GB/T 7939-2008《Hydraulic hose assembly test method》In 5.6 section " durability（Pulse）Experiment " will
Ask, its pressure and experiment oil temperature need to meet when hose assembly carries out pulse testing：1）Pressures cycle should be in shade as shown in Figure 1
In region, and it is allowed to as close possible to diagramatic curve.Pressure rise actual speed rate should 100MPa/s ~ 350MPa/s it
Between.2）Pressure is 100%, 125%, the 133% of hose assembly maximum working pressure, and Fuel temperature is maintained at 100 DEG C ± 3
℃.It can thus be concluded that, to meet testing standard, hydraulic hose pulse testing must accurately be controlled to pulse and oil temperature
System.
To meet requirement of the testing standard to pulse and oil temperature, current hydraulic hose pulse test bench generally use with
Lower two methods are realized.1）A kind of is that the hydraulic hose pulse test bench as described in patent publication No. CN101672747A is used
The method of environmental chamber combination stop valve.During pulse testing, tested hydraulic hose is placed in environmental chamber（Set in it
Having heaters）, stop valve closing（Play pressure maintaining effect）, by controlling the temperature of environmental chamber therefore desirable for ensureing to tested soft
The temperature control requirement of pipe.It is disadvantageous in that, the method does not account for pulse testing incessantly to the impact of hydraulic oil
The rising of oil temperature in tested flexible pipe can be caused, so that testing standard cannot be met.2）Another method such as patent publication No.
Hydraulic hose pulse test bench described in CN103016453B is by the way of throttle orifice combination radiator.Section is flowed through using fluid
Produced heat during stream aperture（Converted by the pressure loss of energy impacted）To keep the steady of tested flexible pipe inner fluid temperature
It is fixed.It is to be understood that experiment impact can all produce the substantial amounts of pressure loss of energy, actually energy-saving effect not every time under the method
It is good.Therefore, a kind of energy-saving effect of development is good, reliability is high, the hydraulic hose pulse of precise control can be carried out to pressure and temperature
Testing stand has important theory and practice meaning.
The content of the invention
The technical problem to be solved in the present invention is to provide the hydraulic hose arteries and veins that a kind of simple structure, energy consumption are low, reliability is high
Rush testing stand.
In order to solve the above technical problems, the present invention provides a kind of thermostatically controlled hydraulic hose pulse test bench, including electricity
Control system, pulse loading system, oil-supplementing system, tested hydraulic hose connection valve block I, tested hydraulic hose connection valve block II.Its
It is characterised by：Tested hydraulic hose connection valve block II is connected by hydraulic control one-way valve with the high temperature fuel tank of oil-supplementing system, hydraulic pressure list
It is connected with the main pump of pulse loading system by two-position two-way solenoid valve to the control mouth of valve, is tested in hydraulic hose connection valve block
Be provided with the temperature sensor of test oil temperature, temperature sensor electrically connects with the input of electric-control system, electric-control system output end and
The control end electrical connection of the three position four-way electromagnetic valve of two-position two-way solenoid valve and pulse loading system；Pulse loading system is pressurized
B mouthfuls of cylinder directly connects main fuel tank, and B mouthfuls of three position four-way electromagnetic valve is blocked.
As the improvement to hydraulic hose pulse test bench of the invention：The main fuel tank of the pulse loading system and repairing
The high temperature fuel tank of system is independently separated.
As the improvement to hydraulic hose pulse test bench of the invention：Be provided with described high temperature fuel tank electric heater and
Temperature sensor, temperature sensor is electrically connected with the input of electric-control system, and electric heater is electrically connected with the output end of electric-control system
Connect.
As the improvement to hydraulic hose pulse test bench of the invention：The hydraulic pump of described pulse loading system is by becoming
Frequency motor drives.
Compared with prior art, hydraulic hose pulse test bench of the invention has the advantages that：
1）Oil liquid temperature control uses the close-loop control mode of hydraulic control one-way valve combination temperature sensor, it is ensured that during pulse testing
The stabilization of oil liquid temperature, and hydraulic control one-way valve only multiple pulses impact after oil liquid temperature increase to over test requirements document when beat
Open, reduce keying frequency, improve its service life.
2）B mouthfuls of three position four-way electromagnetic valve is blocked, and B mouthfuls of pressurized cylinder directly connects main fuel tank, during pulse off-load, according to
Oil liquid pressure by oil-supplementing system hydraulic pump outlet makes pressurized cylinder fast retractile, and this structure both ensure that the quick of pulse
Off-load, ensures that accumulator will not drain the oil in off-load, reduce system energy consumption again.
3）The hydraulic pump of pulse loading system is driven by variable-frequency motor, by the rotating speed for changing variable-frequency motor, you can regulation
The flow of hydraulic pump outlet, convenient control impulse waveform.
Brief description of the drawings
Fig. 1 is the different discharge of main pump pulse waveforms of hydraulic hose pulse testing standard regulation
Fig. 2 is the system architecture connection diagram of hydraulic hose pulse test bench of the present invention.
Fig. 3 is electric-control system connection diagram of the present invention.
1-main fuel tank of description of symbols in figure；2-variable-frequency motor；3-hydraulic pump I；4-check valve I；5-overflow valve I；
6-pressure sensor I；7-pressure gauge I；8-accumulator；9-three position four-way electromagnetic valve；10-pressurized cylinder；11-bi-bit bi-pass
Magnetic valve；12-pressure sensor I；13-tested hydraulic hose connection valve block I；14-tested flexible pipe；15-temperature sensor
Ⅰ；16-tested hydraulic hose connection valve block II；17-pressure sensor III；18-pressure gauge II；19-hydraulic control one-way valve；
20-overflow valve II；21-check valve II；22-high temperature fuel tank；23-hydraulic pump II；24-temperature sensor II；25-electricity adds
Hot device.
Specific embodiment
The one embodiment in the present invention is further described below in conjunction with the accompanying drawings：
As shown in drawings, hydraulic hose pulse test bench of the present invention includes electric-control system, pulse loading system, oil-supplementing system, quilt
Test solution pressure hose connection valve block I 13 and tested hydraulic hose connection valve block II 16.
Pulse loading system includes main fuel tank 1, hydraulic pump I 3, check valve I 4, overflow valve I 5, accumulator 8,3-position 4-way electricity
Magnet valve 9, pressurized cylinder 10；Main fuel tank 1 is connected with the oil inlet of hydraulic pump I 3 and the oil-out of overflow valve I 5 respectively；Hydraulic pump I 3
Driven by variable-frequency motor 2, the oil-out of hydraulic pump I 3 is connected with the oil inlet of check valve I 4；Set at the oil-out of check valve I 4
There are pressure sensor I 6 and a pressure gauge I 7, the oil-out of check valve I 4 oil inlet, 3-position 4-way electromagnetism respectively with overflow valve I 5
P mouthfuls of valve 9 is connected with the hydraulic fluid port of accumulator 8；T mouthfuls of three position four-way electromagnetic valve 9 is connected with main fuel tank 1,3-position 4-way electromagnetism
A mouthfuls of valve 9 is connected with A mouthfuls of pressurized cylinder 10, and B mouthfuls of three position four-way electromagnetic valve 9 is blocked；B mouthfuls of pressurized cylinder 10 and main fuel tank 1
Connection, C mouthfuls of pressurized cylinder 10 is connected with the oil-out of check valve II 21, and D mouthfuls of pressurized cylinder 10 is connected with tested hydraulic hose
The hydraulic fluid port of valve block I 13 is connected, and pressure sensor 12 is provided between pressurized cylinder 10 and tested hydraulic hose connection valve block I 13.
Oil-supplementing system includes high temperature fuel tank 22, hydraulic pump II 23, overflow valve II 20, check valve II 21, hydraulic control one-way valve 19
With two-position two-way solenoid valve 11；Temperature sensor II 24 and electric heater 25, temperature sensor II 24 are provided with high temperature fuel tank 22
Electrically connected with the input of electric-control system, electric heater is electrically connected with the output end of electric-control system；High temperature fuel tank 22 respectively with liquid
The oil inlet of press pump II 23 is connected with the oil-out of overflow valve II 20；The oil-feed of the oil-out check valve II 21 of hydraulic pump II 23
Mouth is connected；The oil-out of check valve II 21 oil inlet respectively with overflow valve II 20, C mouthfuls of pressurized cylinder 10 be connected, unidirectionally
Pressure sensor III 17 and pressure gauge 18 are provided with the oil-out of valve II 21；The oil inlet of hydraulic control one-way valve 19 and high temperature fuel tank 22
Connection, the control mouth of hydraulically-controlled one-way valve 19 is connected with A mouthfuls of two-position two-way solenoid valve 11, the oil-out of hydraulically-controlled one-way valve 19 and
The hydraulic fluid port of tested hydraulic hose connection valve block II 16 is connected；P mouthfuls of two-position two-way solenoid valve 11 with the oil-out of check valve I 4
It is connected；Tested hydraulic hose connection valve block II 16 is provided with temperature sensor I 15, temperature sensor I 15 and electric-control system
Input is electrically connected, and output end and the control end of two-position two-way solenoid valve 11 and three position four-way electromagnetic valve 9 of electric-control system are electrically connected
Connect.
The course of work：
Before experiment first by tested flexible pipe 14 be connected to tested hydraulic hose connection valve block I and tested hydraulic hose connection valve block II it
Between, according to hydraulic system is connected shown in accompanying drawing, two-position two-way solenoid valve 11 and three position four-way electromagnetic valve 9 are powered off, while basis
Need to adjust the set pressure of overflow valve I 5 and overflow valve II 20.Heater 25 is set to work by electric-control system, high temperature fuel tank
Oil liquid temperature in 22 is raised, and when temperature sensor II 24 detects oil liquid temperature meets test requirements document, heater stops work
Make.The electric motor starting for making to be connected with hydraulic pump I 3 and hydraulic pump II 23 by electric-control system, drives hydraulic pump I 3 and hydraulic pump II
23 work, the hydraulic oil of the output of hydraulic pump I 3 makes accumulator 8 full of fluid, and the high-temperature oil liquid of the output of hydraulic pump II 23 is full of tested
The right chamber of flexible pipe 14 and its corresponding pipeline and pressurized cylinder 10.
When the left position of three position four-way electromagnetic valve 9 obtains electric, P mouthfuls of three position four-way electromagnetic valve 9 leads to A mouthful two, hydraulic pump I 3 and storage
Can the hydraulic oil of the output of device 8 quickly fill with the left chamber of pressurized cylinder 10, and then promote the piston of pressurized cylinder 10 to move right, now by
Fluid in examination hydraulic hose 14 is compressed, and pressure rise, pressure sensor 12 records the change procedure of pressure.Work as 3-position 4-way
The right position of magnetic valve 9 obtains electric, and A mouthfuls of three position four-way electromagnetic valve 9 is connected with main fuel tank 1, the pressure oil of the now output of hydraulic pump II 23
Into the right chamber of pressurized cylinder 10, the piston fast retractile of pressurized cylinder 10, pressure reduction, pressure sensor 12 is set to record the change of pressure
Change process.Thus, by electric-control system set frequency, make 3-position 4-way electromagnetism constantly electric and dead electricity, then can be tested
Flexible pipe 14 carries out pulse shock experiment.
The oil liquid temperature control of hydraulic hose pulse testing：
The oil liquid temperature control of high temperature fuel tank：It is unsatisfactory for when temperature sensor II 24 detects the oil liquid temperature in high temperature fuel tank 22
During test requirements document, heater 25 is set to work by electric-control system, oil liquid temperature is raised, when temperature sensor II 24 detects fluid
When temperature meets test requirements document, then heater is stopped.
The control of tested hydraulic hose oil liquid temperature：When the temperature sensor being arranged on hydraulic hose connection valve block II 16
I 15 detect oil liquid temperature when meeting test requirements document, and two-position two-way solenoid valve 11 is powered off, and hydraulic control one-way valve 19 is closed；Multiple arteries and veins
After hitting in a state of excitement, due to the continuous compression of fluid, the oil liquid temperature being tested in hydraulic hose is raised, so that temperature sensor I 15 is examined
When measuring oil liquid temperature and being unsatisfactory for test requirements document, by electric-control system make two-position two-way solenoid valve 11 it is electric, then hydraulic pump I 3 is defeated
The hydraulic oil for going out opens hydraulic control one-way valve 19, and the fluid in high temperature fuel tank is replenished tested flexible pipe by hydraulic pump II 23, quite
In the fluid in high temperature fuel tank in tested hydraulic hose internal circulation flow, it is set to meet test requirements document.Thus, it is tested flexible pipe fluid
Temperature control uses the close-loop control mode of hydraulic control one-way valve combination temperature sensor, it is ensured that the stabilization of oil liquid temperature.
Finally, in addition it is also necessary to it is noted that listed above is only a specific embodiment of the invention.Obviously, the present invention
Above example is not limited to, there can also be many deformations.One of ordinary skill in the art can be straight from present disclosure
The all deformations derived or associate are connect, protection scope of the present invention is considered as.
Claims (4)
1. a kind of thermostatically controlled hydraulic hose pulse test bench, including electric-control system, pulse loading system, oil-supplementing system, quilt
Test solution pressure hose connection valve block I, tested hydraulic hose connection valve block II；It is characterized in that：Tested hydraulic hose connection valve block II
Connected with the high temperature fuel tank of oil-supplementing system by hydraulic control one-way valve, the control mouth of hydraulically-controlled one-way valve by two-position two-way solenoid valve with
The hydraulic pump connection of pulse loading system, is provided with the temperature sensor of test oil temperature, temperature in tested hydraulic hose connection valve block
Sensor is electrically connected with the input of electric-control system, electric-control system output end and two-position two-way solenoid valve and pulse loading system
Three position four-way electromagnetic valve control end electrical connection；B mouthfuls of pulse loading system pressurized cylinder directly connects main fuel tank, 3-position 4-way
B mouthfuls of magnetic valve is blocked.
2. thermostatically controlled hydraulic hose pulse test bench according to claim 1, it is characterised in that：The pulse loading
The main fuel tank of system is independently separated with the high temperature fuel tank of oil-supplementing system.
3. thermostatically controlled hydraulic hose pulse test bench according to claim 2, it is characterised in that：Described high temperature oil
Electric heater and temperature sensor are provided with case, temperature sensor is electrically connected with the input of electric-control system, electric heater with electricity
The output end electrical connection of control system.
4. thermostatically controlled hydraulic hose pulse test bench according to claim 1, it is characterised in that：Described pulse adds
The hydraulic pump of loading system is driven by variable-frequency motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710194129.4A CN106837934A (en) | 2017-03-28 | 2017-03-28 | Thermostatically controlled hydraulic hose pulse test bench |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710194129.4A CN106837934A (en) | 2017-03-28 | 2017-03-28 | Thermostatically controlled hydraulic hose pulse test bench |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106837934A true CN106837934A (en) | 2017-06-13 |
Family
ID=59142574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710194129.4A Pending CN106837934A (en) | 2017-03-28 | 2017-03-28 | Thermostatically controlled hydraulic hose pulse test bench |
Country Status (1)
| Country | Link |
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| CN (1) | CN106837934A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107917123A (en) * | 2017-12-20 | 2018-04-17 | 广州市新欧机械有限公司 | A kind of hydraulic valve is tired and high pressure resistant testing stand |
| CN108918282A (en) * | 2018-07-14 | 2018-11-30 | 福州大学 | A kind of temperature controlled pulse pilot system of band and its working method |
| CN109506861A (en) * | 2018-10-30 | 2019-03-22 | 上海大学 | A kind of hose deflects hydraulic impulse testing stand |
| CN110905887A (en) * | 2019-10-30 | 2020-03-24 | 润琛液压机械南通有限公司 | High-voltage and ultrahigh-voltage combined test board |
| CN112208789A (en) * | 2020-10-10 | 2021-01-12 | 江西洪都航空工业集团有限责任公司 | Hydraulic pulse sine wave test device and method for airplane |
| CN112727851A (en) * | 2020-11-25 | 2021-04-30 | 河南航天液压气动技术有限公司 | Three-comprehensive test platform based on pulse test and working method thereof |
| AT525554A4 (en) * | 2022-02-22 | 2023-05-15 | Hainzl Ind Gmbh | Process for controlling the pressure of an actuator for testing test specimens |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4241199C1 (en) * | 1992-12-08 | 1993-11-25 | Schmidt & Co Gmbh Kranz | Hydraulic fluid circulation system for hydraulic testing of hoses and other components - has connecting pipes for test components fitted with temp. converters and controllable heating elements |
| CN2672643Y (en) * | 2003-12-10 | 2005-01-19 | 天津市精研工程机械传动有限公司 | Pulse test table for hydraulic soft tube assembly |
| CN101672747A (en) * | 2009-10-15 | 2010-03-17 | 徐州天地重型机械制造有限公司 | Hydraulic hose performance test experiment table |
| CN201508303U (en) * | 2009-09-10 | 2010-06-16 | 深圳市弗赛特检测设备有限公司 | Hose pulse testing machine |
| CN103016453A (en) * | 2012-12-14 | 2013-04-03 | 浙江大学 | Impulse test system of hydraulic hose |
| CN203083884U (en) * | 2012-12-19 | 2013-07-24 | 天津工程机械研究院 | Reliability test device for hydraulic hose assembly |
| 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 |
| CN105938073A (en) * | 2015-12-24 | 2016-09-14 | 石油和化学工业橡胶及再生产品质量监督检验中心（天津市质量监督检验站第四十二站） | Pressure pulse test hydraulic system for rubber hose detection |
-
2017
- 2017-03-28 CN CN201710194129.4A patent/CN106837934A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4241199C1 (en) * | 1992-12-08 | 1993-11-25 | Schmidt & Co Gmbh Kranz | Hydraulic fluid circulation system for hydraulic testing of hoses and other components - has connecting pipes for test components fitted with temp. converters and controllable heating elements |
| CN2672643Y (en) * | 2003-12-10 | 2005-01-19 | 天津市精研工程机械传动有限公司 | Pulse test table for hydraulic soft tube assembly |
| CN201508303U (en) * | 2009-09-10 | 2010-06-16 | 深圳市弗赛特检测设备有限公司 | Hose pulse testing machine |
| CN101672747A (en) * | 2009-10-15 | 2010-03-17 | 徐州天地重型机械制造有限公司 | Hydraulic hose performance test experiment table |
| CN103016453A (en) * | 2012-12-14 | 2013-04-03 | 浙江大学 | Impulse test system of hydraulic hose |
| CN203083884U (en) * | 2012-12-19 | 2013-07-24 | 天津工程机械研究院 | Reliability test device for hydraulic hose assembly |
| CN105938073A (en) * | 2015-12-24 | 2016-09-14 | 石油和化学工业橡胶及再生产品质量监督检验中心（天津市质量监督检验站第四十二站） | Pressure pulse test hydraulic system for rubber hose detection |
| 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 |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107917123A (en) * | 2017-12-20 | 2018-04-17 | 广州市新欧机械有限公司 | A kind of hydraulic valve is tired and high pressure resistant testing stand |
| CN107917123B (en) * | 2017-12-20 | 2024-05-24 | 广州市新欧机械有限公司 | Hydraulic valve fatigue and high pressure resistant test stand |
| CN108918282A (en) * | 2018-07-14 | 2018-11-30 | 福州大学 | A kind of temperature controlled pulse pilot system of band and its working method |
| CN109506861A (en) * | 2018-10-30 | 2019-03-22 | 上海大学 | A kind of hose deflects hydraulic impulse testing stand |
| CN110905887A (en) * | 2019-10-30 | 2020-03-24 | 润琛液压机械南通有限公司 | High-voltage and ultrahigh-voltage combined test board |
| CN112208789A (en) * | 2020-10-10 | 2021-01-12 | 江西洪都航空工业集团有限责任公司 | Hydraulic pulse sine wave test device and method for airplane |
| CN112727851A (en) * | 2020-11-25 | 2021-04-30 | 河南航天液压气动技术有限公司 | Three-comprehensive test platform based on pulse test and working method thereof |
| AT525554A4 (en) * | 2022-02-22 | 2023-05-15 | Hainzl Ind Gmbh | Process for controlling the pressure of an actuator for testing test specimens |
| AT525554B1 (en) * | 2022-02-22 | 2023-05-15 | Hainzl Ind Gmbh | Process for controlling the pressure of an actuator for testing test specimens |
| EP4230992A1 (en) | 2022-02-22 | 2023-08-23 | Hainzl Industriesysteme GmbH | Method for controlling the pressure of an actuator for testing test samples |
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Application publication date: 20170613 |