CN105927617B - A kind of aircraft large hydraulic pressurized strut general-utility test platform - Google Patents
A kind of aircraft large hydraulic pressurized strut general-utility test platform Download PDFInfo
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- CN105927617B CN105927617B CN201610410763.2A CN201610410763A CN105927617B CN 105927617 B CN105927617 B CN 105927617B CN 201610410763 A CN201610410763 A CN 201610410763A CN 105927617 B CN105927617 B CN 105927617B
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- pressurized strut
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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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- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
A kind of aircraft large hydraulic pressurized strut general-utility test platform, including：One testing stand (1), for rectangle, one end of testing stand is fixed with pressurized strut (7) cylinder fixing end (2), the other end is fixed with speed displacement sensor (6), the centre of testing stand is provided with longitudinal rail (19), pressurized strut piston rod rod end fixing end (3) is slidably supporting on guide rail, the side of guide rail is fixed with lengthy calibration block (4), and oil circuit modular converter (5) is further fixed on testing stand.This equipment can very easily carry out the functional test of a variety of piece number aircraft large hydraulic pressurized struts, can be rapidly completed the stroke test of component, start velocity test, damping rate test, and equipment has reserved upgrading space, and Operation and Maintenance is simple and convenient.
Description
Technical field
The present invention relates to a kind of aircraft large hydraulic pressurized strut general-utility test platform, the aircraft that can complete a variety of piece numbers is big
Type hydraulic actuator test job.
Background technology
Airplane hydraulic pressure pressurized strut be prevalent in the flight control of all kinds of types, undercarriage, it is counter push away etc. in multiple systems, be
Linear reciprocating motion type executive component, it is the final executive component externally done manual work in hydraulic system, its effect is directly by hydraulic pressure
Mechanical energy can be converted to.
Different regions of the airplane hydraulic pressure pressurized strut due to being installed on aircraft, manipulate different parts, required start
The parameter of cylinder is different, and pressurized strut cylinder fixing end and piston rod eye termination use various sizes of fixing bearing, pressurized strut
Length is different, and stroke is also different, and the load force provided is also different.In traditional test, different starts
Cylinder need to use different test equipments to complete functional test.The design is intended to complete more large-scale liquid of piece number using same test platform
Press the functional test work of pressurized strut.
The content of the invention
The technical problems to be solved by the invention, just it is to provide a kind of aircraft large hydraulic pressurized strut general-utility test platform,
The integration test of a variety of piece number large hydraulic pressurized strut functions is realized, can not only complete the start test of pressurized strut, can be with
It is rapidly completed the stroke test of pressurized strut, start velocity test and damping test.
Solves above-mentioned technical problem, the technical solution adopted in the present invention is as follows：
A kind of aircraft large hydraulic pressurized strut general-utility test platform, it is characterised in that including：
One testing stand 1, is rectangle, and it is solid that one end of testing stand is fixed with the cylinder fixing end 2 of pressurized strut 7, the other end
Surely there is speed displacement sensor 6, the centre of testing stand is provided with longitudinal rail 19, and pressurized strut work is slidably supporting on guide rail
Stopper rod rod end fixing end 3, the side of guide rail are fixed with lengthy calibration block 4, oil circuit modular converter 5 are further fixed on testing stand.
Described pressurized strut cylinder fixing end 2 includes：
One cylinder firm banking 8, formed by welding two orifice plates erect on bottom plate, the hole symmetric coaxial of two orifice plates, bottom plate
On be provided with fixed bolt hole；
One cylinder steady pin 9, one end carry bushing and positioning shaft shoulder, and bushing corresponds to the cylinder firm banking orifice plate
Hole, the other end car of cylinder steady pin have external screw thread；
One cylinder installs bushing 10, be embedded in the hole of the orifice plate of cylinder firm banking one, internal diameter correspond to it is described
The cylinder steady pin diameter of axle；
One cylinder fixing nut 11, corresponding to the external screw thread of the cylinder steady pin other end；
The cylinder steady pin through two orifice plates hole, centre may pass through pressurized strut cylinder fixing end, car have it is externally threaded
The other end is supported on cylinder installation bushing 10 and fixed with cylinder fixing nut 11.
Described pressurized strut piston rod rod end fixing end 3 includes：
One rod end firm banking 12, it is made up of the orifice plate that two extensions are welded on the riser of vertical base plate, the hole pair of two orifice plates
Claim coaxially, link bolt hole to be provided with the level board of vertical base plate；
One rod end steady pin 13, one end carry bushing and positioning shaft shoulder, and bushing corresponds to the rod end firm banking hole
Plate hole, the other end car of rod end steady pin have external screw thread；
One rod end installs bushing 14, be embedded in the hole of the orifice plate of rod end firm banking one, internal diameter correspond to it is described
The rod end steady pin diameter of axle；
One rod end fixing nut 15, corresponding to the external screw thread of the rod end steady pin other end；
One grating scale 18, including the grating scale move portion 182 being fixed in the transition block and be fixed on table top
Grating scale fixed part 181；
One transition block 16 and a sliding-rail sliding 17；
The rod end firm banking 12 is installed on transition block 16 with connector, be additionally provided with transition block 16 calibration hole and
Speed displacement sensor connecting pin；Described sliding block 17 is fixed under transition block 16 with connector, and sliding block is led in the longitudinal direction
Moved along a straight line on rail；A described grating scale 18 is installed in transition block 16；
Hole, the centre of the rod end steady pin 13 through two orifice plates may pass through pressurized strut piston rod rod end, car has external screw thread
The other end be supported on rod end installation bushing 14 and fixed with rod end fixing nut 15.
The described top of lengthy calibration block 4 is provided with a calibration hole, matches the alignment pin 20 used and is inserted in pressurized strut rod end
In calibration hole in the transition block of fixing end, alignment pin carries out lengthy calibration by being inserted into calibration hole.
The oil circuit modular converter 5 contains a hand-operated direction valve and the block that confluxes, and is pacified hand-operated direction valve using screw rod
Loaded on conflux on block, the block that will conflux is installed on testing stand.
The described sensor containing speed displacement of speed displacement sensor 6 and speed displacement sensor fixed block, uses bolt
Speed displacement sensor is attached to fixed block, fixed block is installed on testing stand, speed displacement sensor is connected to bar
The transition block of fixing end is held, measures the start speed and damping rate of pressurized strut.
Described testing stand 1 has road wheel.
On the basis of the above, the present invention has various remodeling：
Described pressurized strut testing stand, the testing stand of the hydraulic actuator of different piece number types can be improved to, it is real
The functional test of existing all kinds of hydraulic actuators.
Described pressurized strut cylinder fixing end, it can be processed various sizes of according to the size of pressurized strut cylinder fixing end
Steady pin, installation bearing and fixing nut, to realize good secure fit.
Described pressurized strut piston rod rod end fixing end, can be according to different pressurized strut piston rod rod end bearing sizes, hole
Footpath size, various sizes of steady pin, installation bearing and fixing nut are processed, to realize good secure fit；Can basis
Length is taken in the different stretching of different pressurized struts, chooses to install corresponding sliding block slide rail stroke, corresponding grating scale stroke is chosen to install, with reality
Now good Stroke Control.
Described lengthy calibration block, length can be taken according to the stretching of different pressurized struts, be installed on testing stand not
Same position, to realize good Stroke Control.
Described oil circuit modular converter, can according to needed for different pressurized struts hydraulic flow size, from desired flow
Hand-operated direction valve and conflux block, to realize that good start controls.
Described speed displacement sensor, length and start speed can be taken according to the stretching of different pressurized struts, selected
The speed displacement sensor of suitable range, to realize the good test of start speed and damping rate.
The beneficial effects of the invention are as follows：The functional test of a variety of piece number large hydraulic pressurized struts can be conveniently realized, not only
The start test of pressurized strut can be completed, the stroke test of pressurized strut can also be rapidly completed, start velocity test and damping are surveyed
Examination；Device quality itself is solid, durable, can be with disassembled and assembled freely, and upgrading repacking, repairing are safeguarded simple and convenient.
Brief description of the drawings
Apparatus of the present invention are described further with reference to the accompanying drawings and examples.
Fig. 1 is the aircraft large hydraulic pressurized strut general-utility test platform embodiment general assembly drawing of the present invention；
Fig. 2 is the pressurized strut cylinder fixing end the Nomenclature Composition and Structure of Complexes decomposing schematic representation of Fig. 1 embodiments；
Fig. 3 is the pressurized strut piston rod rod end fixing end the Nomenclature Composition and Structure of Complexes decomposing schematic representation of Fig. 1 embodiments；
Fig. 4 is the pressurized strut piston rod rod end fixing end schematic cross section of Fig. 1 embodiments.
In figure：1- testing stands, 2- pressurized strut cylinder fixing ends, 3- pressurized strut piston rod rod end fixing ends, 4- length school
Quasi- block, 5- oil circuit modular converters, 6- speed displacement sensors, 7- test pressurized struts, 8- cylinder firm bankings, 9- cylinders are fixed
Pin, 10- cylinders installation bushing, 11- cylinder fixing nuts, 12- rod end firm bankings, 13- rod end steady pins, the installation of 14- rod ends
Bushing, 15- rod end fixing nuts, 16- transition blocks, 17- sliding-rail slidings, 18- grating scales, 19- guide rails, 20- lengthy calibration pins.
Embodiment
As shown in figure 1, the aircraft large hydraulic pressurized strut general-utility test platform embodiment of the present invention, including following module：
One testing stand 1：The moving carriage of road wheel is housed containing a rectangle testing stand, including bottom, table top
One end is fixed with pressurized strut cylinder fixing end 2, the other end is fixed with speed displacement sensor 6, and the centre of table top is provided with longitudinal direction and led
Rail, pressurized strut piston rod rod end fixing end 3 is slidably supporting on guide rail；The side of guide rail is fixed with lengthy calibration block 4, platform
Oil circuit modular converter 5 is further fixed on face.
Using alignment pin and bolt by cylinder fixing end 2, rod end fixing end 3, lengthy calibration block 4, oil circuit modular converter 5,
Speed displacement sensor 6 is attached to testing stand 1.
Pressurized strut cylinder fixing end 2 includes：
One cylinder firm banking 8, formed by welding two orifice plates erect on bottom plate, the hole symmetric coaxial of two orifice plates, bottom plate
On be provided with fixed bolt hole；
One cylinder steady pin 9, one end carry bushing and positioning shaft shoulder, and bushing corresponds to 8 liang of the cylinder firm banking
The hole of orifice plate, the other end car of cylinder steady pin 9 have external screw thread；
One cylinder installs bushing 10, be embedded in the hole of the orifice plate of cylinder firm banking 8 one, internal diameter correspond to it is described
The diameter of axle of cylinder steady pin 9；
One cylinder fixing nut 11, corresponding to the external screw thread of the other end of cylinder steady pin 9；
Hole, the centre of cylinder steady pin 9 through two orifice plates may pass through pressurized strut cylinder fixing end, the other end is supported on cylinder
Fixed on installation bushing 10 and with cylinder fixing nut 11.
Pressurized strut piston rod rod end fixing end 3 includes：
One rod end firm banking 12, it is made up of the orifice plate that two extensions are welded on the riser of vertical base plate, the hole pair of two orifice plates
Claim coaxially, link bolt hole to be provided with the level board of vertical base plate；
One rod end steady pin 13, one end carry bushing and positioning shaft shoulder, and bushing corresponds to the rod end firm banking 12
The hole of two orifice plates, the other end car of rod end steady pin 13 have external screw thread；
One rod end installs bushing 14, is embedded in the hole of the orifice plate of rod end firm banking 12 1, internal diameter corresponds to institute
State the diameter of axle of rod end steady pin 13；
One rod end fixing nut 15, corresponding to the external screw thread of the other end of rod end steady pin 13；
One transition block 16 and a sliding-rail sliding 17；
Rod end firm banking 12 is installed on transition block 16 with connector, and transition block 16 is provided with calibration hole and velocity potential
Displacement sensor connecting pin；Described sliding block 17 is fixed under transition block 16 with connector, and sliding block is enterprising in the longitudinal rail
Row linear motion；One grating scale 18 is installed in transition block 16；
Hole, the centre of rod end steady pin 13 through two orifice plates may pass through pressurized strut piston rod rod end, the other end is supported on bar
Fixed on end installation bushing 14 and with rod end fixing nut 15；
Lengthy calibration block 4：Calibration block and alignment pin 20 containing a calibration hole, alignment pin insertion pressurized strut rod end is fixed
Calibration hole in the transition block at end is inserted into the calibration hole on calibration block, carries out lengthy calibration.
Oil circuit modular converter 5：Containing a hand-operated direction valve and the block that confluxes, hand-operated direction valve is pacified using 4 screw rods
Loaded on confluxing on block, testing stand is installed on using 4 screw rods block that will conflux, the A-B conversions of hydraulic circuit is realized, is made with realizing
Control is taken in the stretching of dynamic cylinder.
Speed displacement sensor 6：Sensor containing speed displacement and speed displacement sensor fixed block, will using 4 bolts
Speed displacement sensor is attached to fixed block, fixed block is installed on into testing stand using 4 bolts, by speed displacement sensor
The transition block of rod end fixing end is connected to, measures the start speed and damping rate of pressurized strut.
Grating scale 18 includes being fixedly installed in the grating scale fixed part 181 of testing stand and is installed on the light of transition block
Grid chi move portion 182.Length is taken in the stretching that pressurized strut is measured with this.
Oil circuit modular converter 5 realizes the A-B conversions of hydraulic circuit, to realize that control is taken in the stretching of pressurized strut；
Speed displacement sensor 6：Sensor containing speed displacement and speed displacement sensor fixed block, will using 4 bolts
Speed displacement sensor is attached to fixed block, fixed block is installed on into testing stand using 4 bolts, by speed displacement sensor
The transition block of rod end fixing end is connected to, measures the start speed and damping rate of pressurized strut.
Aircraft large hydraulic pressurized strut general-utility test platform implementation steps：
1) according to Fig. 1, Fig. 2 and Fig. 3, before test pressurized strut is not installed, rod end fixing end 3 is moved to lengthy calibration
At block 4, alignment pin is inserted, grating scale is reset, and as datum length, then takes out alignment pin, rod end fixing end 3 can be on slide rail
Freely activity；
2) according to Fig. 1 and Fig. 2, the cylinder fixing end for testing pressurized strut 7 is placed on to the firm banking 8 of cylinder fixing end 2
Centre, according to the bearing bore diameter of pressurized strut cylinder fixing end, from corresponding steady pin 9, bushing 10 and fixing nut 11 are installed,
The cylinder for testing pressurized strut 7 is fixed in cylinder fixing end 2；
3) according to Fig. 1 and Fig. 3, the rod end for testing the piston rod of pressurized strut 7 is placed on to the firm banking 12 of rod end fixing end 3
Centre, according to the bearing bore diameter of piston rod rod end, from corresponding steady pin 13, bushing 14 and fixing nut 15 are installed, will be surveyed
The piston rod rod end for trying pressurized strut 7 is fixed in rod end fixing end 3；
4) according to Fig. 1, using fluid pressure line, oil circuit modular converter 5 and test pressurized strut 7 are connected to together, composition is surveyed
Formation testing road；
5) according to Fig. 1, the stretching of speed displacement sensor 6 is connected in the transition block 18 of rod end fixing end 3；
6) according to Fig. 1, pressurizeed using oil circuit modular converter 6 to pressurized strut, circulate pressurized strut back and forth；
7) according to Fig. 1, pressurized strut is taken in using oil circuit modular converter 6, when pressurized strut is in complete take in, reads grating scale
Reading, calculated with datum length, draw pressurized strut takes in length；
8) according to Fig. 1, pressurized strut is stretched out using oil circuit modular converter 6, when position is being stretched out in pressurized strut entirely, reads grating scale
Reading, calculated with datum length, draw the extension elongation of pressurized strut；
9) according to Fig. 1, pressurized strut is stretched out using oil circuit modular converter 6, according to the output signal of speed displacement sensor 6,
Speed-displacement curve of pressurized strut stretching is drawn, calculates the stretching speed and damping rate of pressurized strut；
10) according to Fig. 1, pressurized strut is taken in using oil circuit modular converter 6, according to the output signal of speed displacement sensor 6,
Speed-displacement curve that pressurized strut is taken in is drawn, calculate pressurized strut takes in speed and damping rate；
11) according to Fig. 1, Fig. 2 and Fig. 3, after the functional test for completing pressurized strut, pressurized strut is torn open from general-utility test platform
Under, complete test job.
Claims (7)
- A kind of 1. aircraft large hydraulic pressurized strut general-utility test platform, it is characterised in that including：One testing stand（1）, it is rectangle, one end of testing stand is fixed with pressurized strut（7）Cylinder fixing end（2）, the other end It is fixed with speed displacement sensor（6）, the centre of testing stand is provided with longitudinal rail（19）, work is slidably supporting on guide rail Dynamic cylinder piston rod rod end fixing end（3）, the side of guide rail is fixed with lengthy calibration block（4）, oil circuit is further fixed on testing stand Modular converter（5）；Described pressurized strut piston rod rod end fixing end（3）Including：One rod end firm banking（12）, it is made up of the orifice plate that two extensions are welded on the riser of vertical base plate, the hole of two orifice plates is symmetrical Coaxially, it is provided with link bolt hole on the level board of vertical base plate；One rod end steady pin（13）, one end carries bushing and positioning shaft shoulder, and bushing corresponds to the rod end firm banking orifice plate Hole, the other end car of rod end steady pin have external screw thread；One rod end installs bushing（14）, it is embedded in the hole of the orifice plate of rod end firm banking one, internal diameter corresponds to the bar Hold the steady pin diameter of axle；One rod end fixing nut（15）, corresponding to the external screw thread of the rod end steady pin other end；One transition block（16）With a sliding-rail sliding（17）；One grating scale（18）, including the grating scale move portion being fixed in the transition block（182）Be fixed on table top Grating scale fixed part（181）；The rod end firm banking（12）Transition block is installed on connector（16）On, transition block（16）Be provided with calibration hole and Speed displacement sensor connecting pin；Described sliding-rail sliding（17）Transition block is fixed on connector（16）Under and can be described Longitudinal rail（19）On moved along a straight line；The rod end steady pin（13）May pass through pressurized strut piston rod rod end through the hole of two orifice plates, centre, car have it is externally threaded The other end is supported on rod end installation bushing（14）Go up and use rod end fixing nut（15）It is fixed.
- 2. aircraft large hydraulic pressurized strut general-utility test platform according to claim 1, it is characterised in that：Described start Cylinder cylinder fixing end（2）Including：One cylinder firm banking（8）, formed by welding two orifice plates erect on bottom plate, the hole symmetric coaxial of two orifice plates, on bottom plate It is provided with fixed bolt hole；One cylinder steady pin（9）, one end carries bushing and positioning shaft shoulder, and bushing corresponds to the cylinder firm banking orifice plate Hole, the other end car of cylinder steady pin have external screw thread；One cylinder installs bushing（10）, it is embedded in the hole of the orifice plate of cylinder firm banking one, internal diameter corresponds to the cylinder The body steady pin diameter of axle；One cylinder fixing nut（11）, corresponding to the external screw thread of the cylinder steady pin other end；The cylinder steady pin through two orifice plates hole, centre may pass through pressurized strut cylinder fixing end, car have it is externally threaded another End is supported on cylinder installation bushing（10）Go up and use cylinder fixing nut（11）It is fixed.
- 3. aircraft large hydraulic pressurized strut general-utility test platform according to claim 2, it is characterised in that：Described length Calibration block（4）Top is provided with a calibration hole, matches the alignment pin used（20）It is inserted in the transition block of pressurized strut rod end fixing end On calibration hole in, alignment pin measures length by being inserted into calibration hole.
- 4. aircraft large hydraulic pressurized strut general-utility test platform according to claim 3, it is characterised in that：The oil circuit turns Change the mold block（5）Containing a hand-operated direction valve and the block that confluxes, hand-operated direction valve is installed on using screw rod and confluxes on block, will converge Stream block is installed on testing stand.
- 5. aircraft large hydraulic pressurized strut general-utility test platform according to claim 4, it is characterised in that：Described speed Displacement transducer（6）It is bolted on a speed displacement sensor fixed block, fixed block is installed on testing stand, will Speed displacement sensor is connected to the transition block of rod end fixing end, measures the start speed and damping rate of pressurized strut.
- 6. aircraft large hydraulic pressurized strut general-utility test platform according to claim 5, it is characterised in that：Described test Table top（1）With road wheel.
- 7. aircraft large hydraulic pressurized strut general-utility test platform according to claim 6, it is characterised in that：Described start Cylinder testing stand size and dimension, it is different according to the test request of the hydraulic actuator of different piece number types；Described pressurized strut Cylinder fixing end, according to the size of pressurized strut cylinder fixing end, it is equipped with various sizes of steady pin, installation bearing and fixed spiral shell It is female；Described pressurized strut piston rod rod end fixing end, according to different pressurized strut piston rod rod end bearing sizes and pore size, matches somebody with somebody With various sizes of steady pin, installation bearing and fixing nut；Length is taken according to the stretching that different pressurized struts are different, chosen to install pair The sliding block slide rail stroke answered, choose to install corresponding grating scale stroke；Described lengthy calibration block, received according to the stretching of different pressurized struts Enter length, be installed on the diverse location of testing stand；Described oil circuit modular converter, according to hydraulic flow needed for different pressurized struts Size, be equipped with the hand-operated direction valve for adapting to flow and conflux block；Described speed displacement sensor, according to different pressurized struts Length and start speed are taken in stretching, are equipped with the speed displacement sensor of suitable range.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610410763.2A CN105927617B (en) | 2016-06-12 | 2016-06-12 | A kind of aircraft large hydraulic pressurized strut general-utility test platform |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610410763.2A CN105927617B (en) | 2016-06-12 | 2016-06-12 | A kind of aircraft large hydraulic pressurized strut general-utility test platform |
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| CN105927617A CN105927617A (en) | 2016-09-07 |
| CN105927617B true CN105927617B (en) | 2017-12-12 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2557273A (en) | 2016-12-02 | 2018-06-20 | Airbus Operations Ltd | Actuator testing |
| CN106530885B (en) * | 2016-12-28 | 2019-04-09 | 陕西凯捷科技发展有限公司 | One kind destroying Hong seven A type plane hydraulic system maintenance training platforms |
| CN107917809A (en) * | 2017-12-18 | 2018-04-17 | 中国航发贵州黎阳航空动力有限公司 | Fluid Resistance Test fixture before a kind of whole welding type hydraulic actuator weldering |
| CN109026903B (en) * | 2018-08-17 | 2020-08-04 | 湖南亿能电子科技有限公司 | Comprehensive test platform for dynamic performance of hydraulic cylinder of engineering machinery |
| CN109341466B (en) * | 2018-12-06 | 2020-07-21 | 中国航发贵州黎阳航空动力有限公司 | Device and method for measuring space size of hydraulic actuator cylinder |
| CN115217817B (en) * | 2022-09-20 | 2022-12-02 | 济宁鲁威液压科技股份有限公司 | Hydraulic cylinder balance test system and test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201412416Y (en) * | 2009-06-17 | 2010-02-24 | 江苏恒立高压油缸有限公司 | Cylinder testing device |
| KR101510639B1 (en) * | 2013-07-08 | 2015-04-10 | 한국기계연구원 | Performance testing device for cylinder |
| CN104180977B (en) * | 2014-05-27 | 2016-10-05 | 西北工业大学 | Multifunctional linear electromechanical actuator performance test stand |
| CN104459189B (en) * | 2014-12-05 | 2017-10-03 | 四川凌峰航空液压机械有限公司 | Pressurized strut piston rod arbitrary distance of run speed measuring device |
| CN105275920A (en) * | 2015-11-04 | 2016-01-27 | 合肥海源机械有限公司 | Hydraulic cylinder test bench |
| CN205744693U (en) * | 2016-06-12 | 2016-11-30 | 广州飞机维修工程有限公司 | A kind of aircraft large hydraulic pressurized strut general-utility test platform |
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