CN108132126A - A kind of combined machine hydraulic cylinder spillage test method - Google Patents
A kind of combined machine hydraulic cylinder spillage test method Download PDFInfo
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- CN108132126A CN108132126A CN201711388835.9A CN201711388835A CN108132126A CN 108132126 A CN108132126 A CN 108132126A CN 201711388835 A CN201711388835 A CN 201711388835A CN 108132126 A CN108132126 A CN 108132126A
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- hydraulic cylinder
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- test method
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
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Abstract
The invention discloses a kind of combined machine hydraulic cylinder spillage test methods, belong to hydraulic cylinder performance detection technical field.The present invention step be：First, hydraulic cylinder to be checked is connect with oil pipeline, hydraulic station, two oil pipelines and hydraulic cylinder collectively constitute a closed circuit；2nd, experimental rig powers on, and under manual state of a control, the piston for pressing start button hydraulic pressure stand control hydraulic cylinder stretches out, and the piston for pressing stop button hydraulic pressure stand control hydraulic cylinder is retracted, and completes one-off, and repetitive operation several times, determines that experimental rig is working properly；3rd, hand automatic switchover knob is switched to automatic transmission, hydraulic station start-stop button is pressed again, PLC control system automatically controls hydraulic station loop start or closing, hydraulic pressure stand control hydraulic cylinder repetitive operation, detection hydraulic cylinder at least time half a day after repetitive operation whether oil leak.The present invention realizes the automatic detection to hydraulic cylinder performance, saves manpower and efficient.
Description
Technical field
The present invention relates to hydraulic cylinder performance detection technical fields, are leaked more specifically to a kind of combined machine hydraulic cylinder
Oil test method.
Background technology
Capital equipment of the lathe as Current mechanical secondary industry, technology development have become domestic mechanical processing industry
Development mark.Numerically-controlled machine tool can carry out automated production on the basis of traditional machine tool, with the flourishing hair of assembling manufacturing industry
Exhibition, numerically-controlled machine tool develop and are widely used with gesture as manufacturing machine tool.Combined machine can make more different processing
Process is compounded on a machine tool, is reduced lathe and fixture so as to reach, is removed the carrying and storage of inter process from, is improved workpiece and is added
Work precision shortens the process-cycle and saves the purpose of working area, is the trend of our times machine tool technology development.Statistical result
Show that combined machine market presentation home equipment occupation rate is low, and the state that import volume remains high, the main reason is that state
Produce combined machine reliability it is not high, integrity problem become restrict domestic combined machine industry development critical bottleneck it
One, the reliability for improving domestic combined machine is very urgent.
Application of the hydraulic cylinder in combined machine is very universal, is the main function components of combined machine, and performance is direct
Determine the reliability of combined machine.The major failure of hydraulic cylinder has oil leak, blocking, output pressure deficiency etc., and above-mentioned failure is all
The reliability of combined machine will be produced bigger effect.Thus, it goes forward, is required for pair by hydraulic cylinder assembling to lathe at present
Hydraulic cylinder performance is tested, it is ensured that indices are qualified.But the prior art is all to rely on manually one by one to survey hydraulic cylinder
Examination, and one hydraulic cylinder of test will typically at least spend the time of half a day, efficiency is low, and reliability is bad and time-consuming and laborious.
Through retrieval, China Patent No. ZL 201010176051.1, authorized announcement date is September in 2014 17 days, innovation and creation
It is entitled：A kind of hydraulic cylinder experimental rig and test method for simulating operating mode；This application is equipped with load cylinder hydraulic device, institute
The hydraulic cylinder experimental rig stated is additionally provided with tested oil cylinder hydraulic device and triangular frame for testing of oil cylinder, the load cylinder hydraulic pressure
Device, triangular frame for testing of oil cylinder are connected with tested oil cylinder hydraulic device by fluid pressure line.This application additionally provides one kind
Simulate the hydraulic cylinder test method of operating mode.Simulate dependence of the hydraulic cylinder experimental rig to testing staff's technology and experience of operating mode
It reduces, carries out load test in holotype journey, any position, test pressure can be according to the actual condition choice experiment of tested oil cylinder
Pressure.This application improves the detection accuracy of oil cylinder performance test, but this application complex structural designs, cumbersome,
Lathe workshop, which often only requires hydraulic cylinder, detects whether that this performance of oil leak is enough, and therefore, this application is simultaneously uncomfortable
It closes and is promoted and applied in lathe workshop.
China Patent No. ZL201510036148.5, authorized announcement date are on November 16th, 2016, and invention and created name is：
Numerically-controlled machine tool Hydraulic System Reliability experimental rig and test method, this application include subject hydraulic system installation section, mould
Intend loading section and automatically control part.No. 1 hydraulic cylinder branch and simulation for being tested the cylinder manifold of hydraulic system installation section add
The hydraulic cylinder rodless cavity oil pipe connection of part is carried, No. 2 hydraulic cylinder branches of cylinder manifold are connect with hydraulic cylinder rod chamber oil pipe；Automatically
The next programmable controller PLC of control section and No. 1 three-position four-way electromagnetic directional valve, 2 of subject hydraulic system installation section
Number three-position four-way electromagnetic directional valve, No. 3 three-position four-way electromagnetic directional valves are connect with No. 4 three-position four-way electromagnetic directional valve electric wires；From
The A/D capture cards and pressure sensor of dynamic control section are connect with pull pressure sensor electric wire.This application aims to solve the problem that numerical control
Machine tool hydraulic system does not have the problem of reliability test and test method, is not the experimental rig for hydraulic cylinder.
Invention content
1. technical problems to be solved by the inivention
All it is one by one to hydraulic pressure by artificial it is an object of the invention to overcome the performance test of hydraulic cylinder in the prior art
The problem of cylinder is tested, and efficiency is low, and reliability is bad and time-consuming and laborious provides a kind of combined machine hydraulic cylinder spillage test
Method；The present invention realizes the automatic detection to hydraulic cylinder performance, saves manpower and efficient.
2. technical solution
In order to achieve the above objectives, technical solution provided by the invention is：
A kind of combined machine hydraulic cylinder spillage test method of the present invention, step are：
Step 1: hydraulic cylinder to be checked is connect with oil pipeline, hydraulic station, two oil pipelines and common group of hydraulic cylinder
Into a closed circuit；
Step 2: experimental rig powers on, under manual state of a control, the work of start button hydraulic pressure stand control hydraulic cylinder is pressed
Plug stretches out, and the piston for pressing stop button hydraulic pressure stand control hydraulic cylinder is retracted, and completes one-off, and repetitive operation several times, determines
Experimental rig is working properly；
Step 3: hand automatic switchover knob is switched to automatic transmission, then press hydraulic station start-stop button, PLC control system
Hydraulic station loop start or closing are automatically controlled, hydraulic pressure stand control hydraulic cylinder repetitive operation, detection hydraulic cylinder is at least half a day
After interior repetitive operation whether oil leak.
As further improvement of the present invention, the oil transportation with 11 both sides hydraulic station of cabinet simultaneously by multiple hydraulic cylinders to be checked
Pipeline connects, and is controlled respectively by the first control panel, the second control panel.
As further improvement of the present invention, by two connectors of coil respectively with two interface phases of chuck controller
Even, magnetic/degaussing button is pressed, is continuously powered to coil 5 hours, whether detection coil is qualified.
A kind of hydraulic cylinder spillage test device of the present invention, including cabinet, the first control panel, the second control panel, liquid
Pressure station, oil pipeline and PLC control system, the PLC control system are set to inside cabinet, the PLC control system it is defeated
Outlet connects hydraulic station through control line, and there are two hydraulic station settings, and the first control panel, the second control panel are controlled respectively
Two hydraulic stations are made, hydraulic station is through oil pipeline connection liquid cylinder pressure.
As further improvement of the present invention, the hydraulic station is respectively arranged at cabinet both sides, and hydraulic station connects with it
Two oil pipelines and hydraulic cylinder connect collectively constitute a closed circuit, single oil pipeline of the hydraulic station setting more than two.
As further improvement of the present invention, single hydraulic station sets 2-10 root oil pipelines.
As further improvement of the present invention, bottom of cabinet bulk setting universal wheel, the top setting display of cabinet
Screen, the first control panel, the second control panel are respectively arranged at the both sides of display screen, and being additionally provided with power supply at the top of cabinet refers to
Show lamp.
As further improvement of the present invention, first control panel, the setting of the second control panel are identical, wrap
It includes scram button, start button, stop button, hydraulic station start-stop button and hand and automatically switches knob.
As further improvement of the present invention, the experimental rig is additionally provided with bracket, and hydraulic cylinder is placed on bracket
On portion's objective table, the objective table side of bracket offers pairs of through-hole, and by internal pipe laying fixed seat, oil pipeline is worn
Piping fixed seat is connect with hydraulic cylinder on objective table.
As further improvement of the present invention, the cabinet one side is provided with cabinet door, by diaphragm plate in the cabinet door
Two regions are divided into, the PLC control system is equipped with chuck controller, two interfaces of the chuck controller and the two of coil
A connector is connected.
As further improvement of the present invention, first control panel and/or the upper magnetic of the second control panel setting/
Degaussing button.
As further improvement of the present invention, the display screen uses industrial touch screen.
3. advantageous effect
Using technical solution provided by the invention, compared with existing known technology, there is following remarkable result：
(1) a kind of hydraulic cylinder spillage test device of the invention, burning control program, control in PLC control system
Hydraulic station loop start or closing, hydraulic station can be acted with Repetitive controller hydraulic cylinder through oil pipeline connection liquid cylinder pressure, detect liquid
Cylinder pressure at least time half a day, it is general 2000 times action after whether oil leak, realize to hydraulic cylinder whether the automation of oil leak
Detection is greatly saved manually, also avoids unqualified hydraulic cylinder and is packed into lathe, lathe is caused to break down, and need to tear machine repair open
Risk；
(2) a kind of hydraulic cylinder spillage test device of the invention, while two hydraulic stations are set, cabinet both sides are distributed in,
And every hydraulic station of setting exports multiple oil pipelines simultaneously, and so multiple hydraulic cylinders can be detected simultaneously, it is opposite to pass
System reduces the recruitment cost of enterprise, while substantially increase hydraulic pressure by the mode manually tested one by one hydraulic cylinder
Cylinder detection efficiency；
(3) a kind of hydraulic cylinder spillage test device of the invention, control panel setting scram button, stop at start button
Only button, hydraulic station start-stop button and hand automatically switch knob, and experimental rig is multiple functional, and at the top of cabinet, setting power supply refers to
Show lamp, in experimental rig operation irregularity, plant area staff can be reminded to come to handle in time, ensure that experiment process safety
It carries out；
(4) a kind of hydraulic cylinder spillage test device of the invention, sets bracket, and hydraulic cylinder is placed in bracket upper stage
On, the objective table side of bracket offers pairs of through-hole, and by internal pipe laying fixed seat, oil pipeline is consolidated across pipeline
Reservation is connect with hydraulic cylinder on objective table, and hydraulic cylinder is orderly placed, and experiment process is not interfere with each other, and pipeline fixed seat can also ensure
Oil pipeline does not generate shaking, and stablizing for guarantee test carries out；
(5) a kind of hydraulic cylinder spillage test device of the invention, cabinet door is interior to be divided into two regions, and PLC by diaphragm plate
Control system is equipped with chuck controller, and two interfaces of the chuck controller are connected with two connectors of coil, can examine simultaneously
Whether test coil is intact, has fully excavated the function of experimental rig, and coil is placed on the diaphragm plate inside cabinet, will not be occupied
Exterior space；
(6) a kind of hydraulic cylinder spillage test device of the invention is a real combination lathe manufacturer actual needs
The experimental rig of design, it is easy to operate, be fully able to satisfy the use demand, and manufacture it is at low cost, it is easy to utilize.
Description of the drawings
Fig. 1 is a kind of vertical view of hydraulic cylinder spillage test device of the present invention；
Fig. 2 is a kind of dimensional structure diagram of hydraulic cylinder spillage test device of the present invention；
Fig. 3 is a kind of flow chart of combined machine hydraulic cylinder spillage test method of the present invention.
Label declaration in schematic diagram：
11st, cabinet；12nd, display screen；131st, the first control panel；132nd, the second control panel；14th, power supply indicator；15、
Control line；21st, hydraulic station；22nd, oil pipeline；31st, bracket；32nd, pipeline fixed seat；4th, hydraulic cylinder.
Specific embodiment
To further appreciate that present disclosure, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.
Embodiment 1
With reference to Fig. 1 and Fig. 2, a kind of hydraulic cylinder spillage test device of the present embodiment, including cabinet 11, the first control panel
131st, the second control panel 132, hydraulic station 21, oil pipeline 22 and PLC control system.The PLC control system is set to
11 inside (not shown) of cabinet, the PLC control system are the brain centres of entire experimental rig, and control was entirely tested
Journey.The output terminal of PLC control system connects hydraulic station 21 through control line 15, and there are two the hydraulic station 21 settings, the first control
Panel 131 processed, the second control panel 132 control two hydraulic stations 21 respectively, and hydraulic station 21 is through 22 connection liquid cylinder pressure 4 of oil pipeline.
The present embodiment burning in PLC control system controls program, controls 21 loop start of hydraulic station or closing, hydraulic station
21, through 22 connection liquid cylinder pressure 4 of oil pipeline, can be acted, detection hydraulic cylinder 4 is at least time half a day with Repetitive controller hydraulic cylinder 4
It is interior, it is general 2000 times action after whether oil leak, realize to hydraulic cylinder 4 whether the automatic detection of oil leak, people is greatly saved
Work also avoids unqualified hydraulic cylinder 4 and is packed into lathe, lathe is caused to break down, need to tear the risk of machine repair open.
The hydraulic station 21 is respectively arranged at 11 both sides of cabinet, 21 connected to it two oil pipelines 22 of hydraulic station,
Also hydraulic cylinder 4 collectively constitutes a closed circuit, and single hydraulic station 21 sets 4 oil pipelines 22, two liquid in the present embodiment
Pressure station 21 can be carried out at the same time the detection of 4 hydraulic cylinders 4.Tradition relies on the mode manually tested one by one hydraulic cylinder relatively,
The recruitment cost of enterprise is reduced, while substantially increases hydraulic cylinder detection efficiency.
11 bottom of the cabinet setting universal wheel, facilitates the movement of experimental rig.The top setting display screen of cabinet 11
12, display screen 12 uses industrial touch screen, and staff directly touch display screen can input related data.First control
Panel 131, the second control panel 132 are respectively arranged at the both sides of display screen 12, are additionally provided with power supply at the top of cabinet 11 and refer to
Show lamp 14.Power supply indicator 14 is used for display circuit normally, in experimental rig operation irregularity, can remind plant area in time
Staff comes to handle, and ensure that experiment process safety carries out.
First control panel 131, the second control panel 132 set identical, including scram button, start and press
Button, stop button, hydraulic station start-stop button and hand automatically switch knob.Scram button is used in emergency situations by experimental rig
Power-off, hand, which automatically switches knob, can realize the switching that controls and automatically control manually, under manual state of a control, press startup by
Button hydraulic station 21 controls the piston of hydraulic cylinder 4 to stretch out, and presses stop button hydraulic station 21 and the piston of hydraulic cylinder 4 is controlled to retract, complete
Into one-off, after hand automatic switchover knob is switched to automatic transmission, then hydraulic station start-stop button is pressed, you can realize experiment
The automatic running of device, operates more hommization, and experimental rig function is more complete.
The experimental rig is additionally provided with bracket 31, and hydraulic cylinder 4 is placed on 31 upper stage of bracket, the load of bracket 31
Object platform side offers pairs of through-hole, and by internal pipe laying fixed seat 32, oil pipeline 22 passes through pipeline fixed seat 32
It is connect with hydraulic cylinder on objective table 4.Hydraulic cylinder 4 is orderly placed, and experiment process is not interfere with each other, and pipeline fixed seat 32 can also ensure
Oil pipeline 22 does not generate shaking, and stablizing for guarantee test carries out.
Embodiment 2
A kind of hydraulic cylinder spillage test device of the present embodiment, substantially with embodiment 1, the difference is that：This implementation
Example is the function of abundant Mining Test device, and cabinet door is set in 11 one side of cabinet, is divided into up and down two by diaphragm plate in the cabinet door
A region, two regions may be used as storing part.The PLC control system is equipped with chuck controller, the chuck controller
Two interfaces be connected with two connectors of coil.It is corresponding, magnetic/degaussing button in the setting of the first control panel 131.It presses
Upper magnetic/degaussing button is continuously powered to coil general 5 hours, if coil is intact, then illustrates coil qualification, can be applied
Onto lathe, coil is placed on the diaphragm plate inside cabinet, will not occupy exterior space.
Referring to Fig. 3, a kind of combined machine hydraulic cylinder spillage test method of the present embodiment, step is：
Step 1: by hydraulic cylinder 4 to be checked with two for one group, 31 top of bracket for being respectively placed in 11 both sides of cabinet carries
On object platform, hydraulic cylinder 4 is connect with oil pipeline 22,21, two oil pipelines 22 of hydraulic station and hydraulic cylinder 4 collectively constitute one
Closed circuit controls both sides hydraulic station 21 respectively by the first control panel 131, the second control panel 132；
Step 2: experimental rig powers on, under manual state of a control, press start button hydraulic station 21 and control hydraulic cylinder 4
Piston stretch out, press stop button hydraulic station 21 and the piston of hydraulic cylinder 4 controlled to retract, complete one-off, repetitive operation is several
It is secondary, determine that experimental rig is working properly；
Step 3: hand automatic switchover knob is switched to automatic transmission, then press hydraulic station start-stop button, PLC control system
21 loop start of hydraulic station or closing are automatically controlled, hydraulic station 21 controls 4 repetitive operation of hydraulic cylinder, and detection hydraulic cylinder 4 is at least
In time half a day after repetitive operation whether oil leak.If it is oil-proof to detect hydraulic cylinder 4, may be mounted on combined machine.
Step 4: two connectors of coil are connected respectively with two interfaces of chuck controller, press magnetic/degaussing by
Button is continuously powered to coil 5 hours, and whether detection coil is qualified, if detection coil is qualified, may be mounted to combined machine
On.
Embodiment 3
A kind of hydraulic cylinder spillage test device of the present embodiment, substantially with embodiment 1, the difference is that：This implementation
Example sets single hydraulic station 21 to connect 6 oil pipelines 22 simultaneously, and two hydraulic stations 21 are carried out at the same time the detection of 6 hydraulic cylinders 4.
Embodiment 4
A kind of hydraulic cylinder spillage test device of the present embodiment, substantially with embodiment 1, the difference is that：This implementation
Example sets single hydraulic station 21 to connect 10 oil pipelines 22 simultaneously, and two hydraulic stations 21 are carried out at the same time the inspection of 10 hydraulic cylinders 4
It surveys.
A kind of hydraulic cylinder spillage test device described in embodiment 1-4 is that a real combination lathe manufacturer is practical
Need the experimental rig designed, it is easy to operate, be fully able to satisfy the use demand, and manufacture it is at low cost, it is easy to utilize.
Schematically the present invention and embodiments thereof are described above, this describes no restricted, institute in attached drawing
What is shown is also one of embodiments of the present invention, and practical structure is not limited thereto.So if common skill of this field
Art personnel are enlightened by it, without departing from the spirit of the invention, are not inventively designed and the technical solution
Similar frame mode and embodiment, are within the scope of protection of the invention.
Claims (10)
1. a kind of combined machine hydraulic cylinder spillage test method, step are：
Step 1: hydraulic cylinder to be checked is connect with oil pipeline (22), hydraulic station (21), two oil pipelines (22) and hydraulic pressure
Cylinder (4) collectively constitutes a closed circuit；
Step 2: experimental rig powers on, under manual state of a control, start button hydraulic station (21) control hydraulic cylinder (4) is pressed
Piston stretch out, press stop button hydraulic station (21) control hydraulic cylinder (4) piston retract, complete one-off, repeat grasp
Make several times, to determine that experimental rig is working properly；
Step 3: hand automatic switchover knob is switched to automatic transmission, then press hydraulic station start-stop button, PLC control system is automatic
Hydraulic station (21) loop start or closing, hydraulic station (21) control hydraulic cylinder (4) repetitive operation are controlled, detection hydraulic cylinder (4) exists
At least in time half a day after repetitive operation whether oil leak.
2. a kind of combined machine hydraulic cylinder spillage test method according to claim 1, it is characterised in that：It will be multiple to be checked
Hydraulic cylinder is connect simultaneously with the oil pipeline (22) of cabinet (11) both sides hydraulic station (21), passes through the first control panel (131),
Two control panels (132) control respectively.
3. a kind of combined machine hydraulic cylinder spillage test method according to claim 2, it is characterised in that：By the two of coil
A connector is connected respectively with two interfaces of chuck controller, presses magnetic/degaussing button, is continuously powered to coil 5 hours, inspection
Whether test coil is qualified.
4. a kind of combined machine hydraulic cylinder spillage test method according to claim 3, it is characterised in that：The experiment
Device includes cabinet (11), the first control panel (131), the second control panel (132), hydraulic station (21), oil pipeline (22)
And PLC control system, the PLC control system are set to cabinet (11) inside, the output terminal of the PLC control system is through control
Line (15) connection hydraulic station (21), there are two the hydraulic station (21) settings, the first control panel (131), the second control plane
Plate (132) controls two hydraulic stations (21) respectively, and hydraulic station (21) is through oil pipeline (22) connection liquid cylinder pressure (4).
5. a kind of combined machine hydraulic cylinder spillage test method according to claim 4, it is characterised in that：The hydraulic pressure
Stand (21) be respectively arranged at cabinet (11) both sides, hydraulic station (21) two oil pipelines (22) connected to it and hydraulic cylinder (4)
Collectively constitute a closed circuit, single oil pipeline (22) of hydraulic station (21) setting more than two.
6. a kind of combined machine hydraulic cylinder spillage test method according to claim 5, it is characterised in that：Single hydraulic station
(21) setting 2-10 roots oil pipeline (22).
7. according to a kind of combined machine hydraulic cylinder spillage test method of claim 4-6 any one of them, it is characterised in that：Institute
Cabinet (11) bottom setting universal wheel stated, the top setting display screen (12) of cabinet (11), the first control panel (131), the
Two control panels (132) are respectively arranged at the both sides of display screen (12), and power supply indicator is additionally provided at the top of cabinet (11)
(14)。
8. a kind of combined machine hydraulic cylinder spillage test method according to claim 7, it is characterised in that：Described first
Control panel (131), the second control panel (132) setting are identical, including scram button, start button, stop button, hydraulic pressure
Stand start-stop button and hand automatically switches knob.
9. a kind of combined machine hydraulic cylinder spillage test method according to claim 8, it is characterised in that：The experiment
Device is additionally provided with bracket (31), and hydraulic cylinder (4) is placed on bracket (31) upper stage, and the objective table side of bracket (31) is opened
Equipped with pairs of through-hole, by internal pipe laying fixed seat (32), oil pipeline (22) is across pipeline fixed seat (32) with carrying
Hydraulic cylinder (4) connects on object platform.
10. a kind of combined machine hydraulic cylinder spillage test method according to claim 9, it is characterised in that：The cabinet
Body (11) one side is provided with cabinet door, and two regions are divided by diaphragm plate in the cabinet door, and the PLC control system is equipped with chuck
Controller, two interfaces of the chuck controller are connected with two connectors of coil；First control panel (131) and/
Or the second magnetic/degaussing button in control panel (132) setting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711388835.9A CN108132126B (en) | 2017-12-20 | 2017-12-20 | Oil leakage test method for hydraulic cylinder of composite machine tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711388835.9A CN108132126B (en) | 2017-12-20 | 2017-12-20 | Oil leakage test method for hydraulic cylinder of composite machine tool |
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| Publication Number | Publication Date |
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| CN108132126A true CN108132126A (en) | 2018-06-08 |
| CN108132126B CN108132126B (en) | 2020-07-31 |
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ID=62391081
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711388835.9A Active CN108132126B (en) | 2017-12-20 | 2017-12-20 | Oil leakage test method for hydraulic cylinder of composite machine tool |
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| Country | Link |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111089724A (en) * | 2020-01-15 | 2020-05-01 | 阳泉煤业华鼎机械有限公司 | Sealing detection test bed |
| CN111550474A (en) * | 2020-05-07 | 2020-08-18 | 徐州徐工液压件有限公司 | Hydraulic system for double-cylinder synchronous load lateral force test bed |
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| CN111550474B (en) * | 2020-05-07 | 2022-03-22 | 徐州徐工液压件有限公司 | Hydraulic system for double-cylinder synchronous load lateral force test bed |
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| Publication number | Publication date |
|---|---|
| CN108132126B (en) | 2020-07-31 |
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