CN206708114U - The energy-efficient hydraulic servo-cylinder controlled with bidirectional buffering and accurate power - Google Patents
The energy-efficient hydraulic servo-cylinder controlled with bidirectional buffering and accurate power Download PDFInfo
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- CN206708114U CN206708114U CN201720532853.9U CN201720532853U CN206708114U CN 206708114 U CN206708114 U CN 206708114U CN 201720532853 U CN201720532853 U CN 201720532853U CN 206708114 U CN206708114 U CN 206708114U
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- rodless cavity
- rod chamber
- cylinder
- cylinder barrel
- rod
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Abstract
A kind of highly integrated hydraulic servo oil cylinder with buffering and overload protection function; including cylinder barrel; piston rod is provided with cylinder barrel; the inner chamber of cylinder barrel is divided into rod chamber and rodless cavity by piston rod; the rod chamber end electrohydraulic servo valve connected with rod chamber and rod chamber end accumulator and the rodless cavity end electrohydraulic servo valve connected with rodless cavity and rodless cavity end accumulator are installed on cylinder barrel, inlet and outlet valve plate is provided with cylinder barrel.Above-mentioned hydraulic servo oil cylinder is applied to the occasion of cylinder rod chamber and rodless cavity all as effective working chamber.There is buffering, vibration-absorbing function during the cylinder efficient, can effectively protect cylinder seal part, electrohydraulic servo valve, pull pressure sensor and start object etc. without damage；Servo-cylinder can effectively be adjusted and enter outflow, hydraulic fluid port inside and outside differential pressure is reduced, there is higher energy valid value；Making dynamic stiffness can also be adjusted in real time, so as to match controlled load rapidly, make it have good dynamic property, can reach accurate power control.
Description
Technical field
A kind of hydraulic servo oil cylinder is the utility model is related to, except with good bidirectional buffering and high frequency servo actuator function
Outside, the addition of double servo valves and double accumulators also makes it have accurate power control performance and higher energy efficiency, belongs to hydraulic pressure
Servo drive technical field.
Background technology
Hydraulic servo oil cylinder has the characteristics that thrust is big, light weight, integrated level are high, dynamic response is fast, control accuracy is high,
It is used widely in the fields such as engineering machinery, metallurgical machinery, ship, Aero-Space, robot.But existing hydraulic servo oil cylinder production
In product, without elastic buffer and over-voltage protecting function, or the accumulator with Microspring effect only is set in single-chamber, be used for
Eliminate the compression shock of single-chamber.The muscle tendon of analogy animal, the storage of its superior stretching and shrinkage for energy with
Sizable effect is all played in the passive dissipation of impulsive force, and hydraulic oil is almost a kind of medium of Incoercibility, and it impacts
Property acting process dissipate substantial amounts of energy, and it is huge to easily cause internal pressure momentary variation, and electro-hydraulic is watched for symmetrical
Valve control asymmetrical cylinder is taken, its rod chamber and rodless cavity fluid are different into and out of amount, and this certainly will will also result in too high
Energy loss.Therefore, in general, due to lacking comprehensively and effectively pressure peak elastic buffer and constantly flow control, acting
Hydraulic servo oil cylinder seal, electrohydraulic servo valve, sensor or start pair are easily caused under the operating mode that frequency is high, jerk is big
As different degrees of damage or the working life for greatly shortening them, on the other hand also reduce system makees efficiency of movement.
Existing servo-cylinder has a bar and rodless cavity flow using single servo valve control mostly, and existing servo valve or
It is proportioning valve, its bandwidth is all relatively low, and a kind of variation rigidity effect of stabilization is unable to maintain that in control, causes using it as driving source
Sufficient formula or other motion platforms with extraneous reciprocation caused by the larger impulsive force that interacts can not thoroughly eliminate, make simultaneously
Dynamic process shows as a kind of " rigid impact process ", and power control accuracy is poor.
Utility model content
The utility model is absorbing impact, start efficiency, power control accuracy etc. for existing hydraulic servo oil cylinder
A kind of deficiency, there is provided energy-efficient hydraulic servo-cylinder controlled with bidirectional buffering and accurate power.
The energy-efficient hydraulic servo-cylinder of the present utility model controlled with bidirectional buffering and accurate power, employs following skills
Art scheme：
The hydraulic servo oil cylinder, including cylinder barrel, piston rod are provided with cylinder barrel, the inner chamber of cylinder barrel has been divided into bar by piston rod
Chamber and rodless cavity, be provided with cylinder barrel the rod chamber end electrohydraulic servo valve connected with rod chamber and rod chamber end accumulator and with
The rodless cavity end electrohydraulic servo valve and rodless cavity end accumulator of rodless cavity connection, are provided with inlet and outlet valve plate, rodless cavity on cylinder barrel
The high pressure hydraulic fluid port of end electrohydraulic servo valve and rod chamber end electrohydraulic servo valve connects with importing and exporting the high-pressure channel of valve plate, rodless cavity end
The low pressure hydraulic fluid port of electrohydraulic servo valve and rod chamber end electrohydraulic servo valve connects with importing and exporting the low-pressure channel of valve plate.
The piston rod is arranged in cylinder barrel by front end housing, and end cap end guiding is provided between piston rod and front end housing
Ring, the one end of piston rod in cylinder barrel are provided with piston end guide ring, and the other end stretches out cylinder barrel and is connected with oscillating bearing.
The cylinder barrel is provided with pull pressure sensor in one end of rodless cavity.
The displacement transducer of detection piston rod displacement is provided with the cylinder barrel.
The rod chamber repairing passage connected with rod chamber and the rodless cavity connected with rodless cavity are provided with the cylinder barrel
Repairing check valve is respectively provided with repairing passage, rod chamber repairing passage and rodless cavity repairing passage.The rod chamber repairing passage
Connected with rodless cavity repairing passage with importing and exporting the low-pressure channel of valve plate.
Above-mentioned hydraulic servo oil cylinder is applied to the occasion of cylinder rod chamber and rodless cavity all as effective working chamber.Work as piston
When bar is compressive load, hydraulic oil compression increased pressure in oil cylinder rodless cavity, part fluid enters inside accumulator, and compression is internal
Air bag, so as to play passive cushioning effect, by adjusting the blowing pressure in accumulator, can effectively it adjust into accumulator
Fluid amount, so as to adjust the degree passively buffered.The additional displacement of piston increases the volume of rod chamber, needed for this partial volume
The fluid wanted passes through the repairing check valve being connected with rod chamber end to provide by low pressure oil revolving end fluid.Surge pressure is inhaled
Receive, it is without damage to be effectively protected cylinder seal part, electrohydraulic servo valve, pull pressure sensor and start object etc..
When piston end is tension load, compression increased pressure is pressed oil in cylinder rod chamber, same part fluid, which enters, to be stored
Inside energy device, inner balloon is compressed, so as to play passive cushioning effect, by adjusting the blowing pressure in accumulator, Ke Yiyou
Effect regulation enters the fluid amount of accumulator, so as to adjust the degree passively buffered.The additional displacement of piston increases piston without bar
The volume of chamber, the fluid required for this partial volume are unidirectional by the repairing being connected with rodless cavity end by low pressure oil revolving end fluid
Valve provides.Surge pressure is absorbed, and is effectively protected cylinder seal part, electrohydraulic servo valve, pull pressure sensor and start pair
As etc. it is without damage.
Rod chamber and the electrohydraulic servo valve at rodless cavity both ends are by the flow of the chamber of servo two, plus the effect of accumulator, its
Effect can be intended than spring-mass block in pairs, making cylinder body general performance go out good variable stiffness and elastic performance, so as to improve
The load matched followability and flexibility of servo hydraulic cylinder.By the way that the output signal of displacement transducer and pull pressure sensor is drawn
Enter in control system, can be achieved to hydraulic servo oil cylinder displacement and the Close loop servo control of power output.
The utility model has the characteristics that：
1. there is buffering, shock-absorbing work(rod chamber and rodless cavity the end accumulator equipped with absorption pressure peak value simultaneously, during work
Can, it can effectively protect cylinder seal part, electrohydraulic servo valve, pull pressure sensor and start object etc. without damage；
2. because rod chamber and rodless cavity end are equipped with electrohydraulic servo valve simultaneously, servo-cylinder disengaging stream can be effectively adjusted
Amount, hydraulic fluid port inside and outside differential pressure is reduced, there is higher energy valid value；
3. because rod chamber and rodless cavity end are equipped with electrohydraulic servo valve and accumulator simultaneously, analogy adds relatively reliable bullet
Property start link, making dynamic stiffness also can constantly be adjusted, and so as to matching controlled load rapidly, make it have good dynamic property,
Accurate power control can be reached.
4. small volume, light weight, available for the workplace that operating frequency is high, installing space is narrow and small.
Brief description of the drawings
Fig. 1 is the external structure that the utility model has bidirectional buffering and the energy-efficient hydraulic servo-cylinder of accurate power control
Schematic diagram.
Fig. 2 is the external structure schematic diagram of the utility model opposite side.
Fig. 3 is longitudinal sectional view of the present utility model.
Fig. 4 is partial sectional view at repairing hole in the utility model.
Fig. 5 is the distribution schematic diagram of cylinder barrel upper oil hole in the utility model.
Fig. 6 is hydraulic schematic diagram of the present utility model.
In figure:1. rod chamber end electrohydraulic servo valve, 2. rod chamber end accumulators, 3. fixed seats, 4. cylinder barrels, 5. front end housings,
6. oscillating bearing, 7. anti-torsion rigid support guide rods, 8. anti-torsion rigid support guide pin bushings, 9. displacement transducers, 10. valve plates, 11. without bar
Chamber end electrohydraulic servo valve, 12. displacement transducer fixed plates, the rodless cavity end accumulator of 13. fixed seat 14., 15. pressures sensing
Device, 16. oscillating bearings, 17. installation lids, 18. dust-proof seal rings, 19. combination sealings, 20.O type circles, 21. end cap end guide rings,
22. piston rod, 23. piston end guide rings, 24. combination sealing pads, the 25. stifled swollen plugs of oil, 26. rod chamber end repairing check valves, 27.
Rod chamber, 28. rodless cavities, 29. rodless cavity end repairing check valves；
401. rodless cavity accumulation of energys connect oilhole, 402. rodless cavities control connection oilhole, and 403. rodless cavity high pressures connect oilhole,
404. valve plate high pressures connect oilhole, 405. rod chamber low pressure connection oilhole, 406. rod chamber high pressures connection oilhole, 407. rod chambers
Control connection oilhole, 408. rod chamber accumulation of energys connection oilhole, 409. rod chamber low pressure are connected repairing hole, and 410. rod chamber ends are oily
Hole, 411. valve plate low pressure connection oilhole, 412. rodless cavity end oilholes, 413. rodless cavity low pressure are connected repairing hole, 414. rodless cavities
Low pressure connects oilhole.
Embodiment
As shown in Figure 1, Figure 2 and Figure 3, the energy-efficient hydraulic of the present utility model controlled with bidirectional buffering and accurate power is watched
Oil cylinder, including cylinder barrel 4 are taken, piston rod 22 is provided with cylinder barrel 4, referring to Fig. 3, piston rod 22 is arranged on cylinder barrel 4 by front end housing 5
It is interior, O-ring 20 is provided between front end housing 5 and cylinder barrel 4, dust-proof seal ring 18, group are provided between piston rod 22 and front end housing 5
Close sealing gasket 9 and end cap end guide ring 21.The one end of piston rod 22 in cylinder barrel 4 is provided with piston end guide ring 23 and combined close
Packing 24, the other end stretch out cylinder barrel 4 and are connected with oscillating bearing 6.Cylinder barrel 4 is divided into rod chamber 27 and rodless cavity 28 by piston rod 22
Two parts (referring to Fig. 6), cylinder barrel 4 are provided with oscillating bearing 16 at rodless cavity end, drawing are provided between cylinder barrel 4 and oscillating bearing 16
Pressure sensor 15.
It is logical in rod chamber side installation rod chamber end electrohydraulic servo valve 1 and rod chamber end accumulator 2, accumulator 2 on cylinder barrel 4
Fixed seat 3 is crossed on cylinder barrel 4, rod chamber end electrohydraulic servo valve 1 and fixed seat 3 connect with rod chamber 27, for connecting
Fabrication hole pass through the swollen closure of plug 25 of stifled oil.
Rodless cavity end electrohydraulic servo valve 11 and rodless cavity end accumulator 14, accumulation of energy are installed on cylinder barrel 4 in rodless cavity side
Device 14 is arranged on cylinder barrel 4 by fixed seat 13, rodless cavity end electrohydraulic servo valve 11 and rodless cavity end accumulator 14 with without bar
Chamber 28 connects.The hydraulic fluid port and storage between hydraulic fluid port, accumulator 2 and fixed seat 3 between fixed seat 3 and fixed seat 13 and cylinder barrel 4
Hydraulic fluid port that can be between device 14 and fixed seat 13 is sealed using O-ring.Displacement transducer fixed plate 12 is additionally provided with cylinder barrel 4,
Displacement transducer 9 and anti-torsion rigid support guide rod 7 are installed between displacement transducer fixed plate 12 and front end housing 5, it is anti-to turn round hardness
Anti- torsion rigid support guide pin bushing 8 is set with support guide rod 7.
Inlet and outlet valve plate 10 is provided with cylinder barrel 4, to connect extraneous hydraulic power source.Rodless cavity end electrohydraulic servo valve 11 and there is bar
The high pressure hydraulic fluid port of chamber end electrohydraulic servo valve 14 connects with importing and exporting the high-pressure channel of valve plate 10, the He of rodless cavity end electrohydraulic servo valve 11
The low pressure hydraulic fluid port of rod chamber end electrohydraulic servo valve 14 connects with importing and exporting the low-pressure channel of valve plate 10.
The rod chamber repairing passage connected with rod chamber 27, rod chamber repairing passage are provided with cylinder barrel 4 at rod chamber end
It is interior setting the unidirectional Fill valve 26 (referring to Fig. 3) in rod chamber end, the unidirectional Fill valve 26 in rod chamber end installed by installing lid 17 (referring to
Fig. 2).The repairing passage connected with rodless cavity 28 is provided with rodless cavity end, the unidirectional repairing in rodless cavity end is installed in repairing passage
Valve 29.Sealed at each connector using O-ring.
According to the part set on cylinder barrel 4, the oilhole with each members is distributed with cylinder barrel 4, as shown in figure 4, bag
Include rodless cavity accumulation of energy connection oilhole 401, rodless cavity control connection oilhole 402, rodless cavity high pressure connection oilhole 403, valve plate high pressure
Connect oilhole 404, rod chamber low pressure connection oilhole 405, rod chamber high pressure connection oilhole 406, rod chamber control connection oilhole
407th, be connected repairing hole 409, rod chamber end of rod chamber accumulation of energy connection oilhole 408, rod chamber low pressure is connected oilhole with rod chamber
410th, the connection of valve plate low pressure oilhole 411, rodless cavity end are connected oilhole 412, rodless cavity low pressure repairing hole 413 and without bar with rod chamber
Chamber low pressure connects oilhole 414.Rodless cavity accumulation of energy connection oilhole 401 is used to connect rodless cavity end accumulator 14.Rodless cavity control connects
Oil-through-hole 402, rodless cavity high pressure connection oilhole 403 connect oilhole 414 with rodless cavity low pressure and are used to connect rodless cavity end electricity respectively
Control port, high-pressure channel and the low-pressure channel of hydraulic servo 11.Rod chamber accumulation of energy connection oilhole 408 is used to connect rod chamber end
Accumulator 2.Rod chamber control connection oilhole 407, rod chamber high pressure connection oilhole 406 connect oilhole 405 with rod chamber low pressure and used
In the control port, high-pressure channel and the low-pressure channel that are connected to rod cavity end electrohydraulic servo valve 1.Valve plate high pressure connects oilhole
404 and valve plate low pressure connection oilhole 411 respectively with import and export valve plate 10 high pressure hydraulic fluid port and low pressure hydraulic fluid port connect, as main oil-hole
Connect extraneous hydraulic power source.Rodless cavity high pressure connection oilhole 403, valve plate high pressure connection oilhole 404 connect oilhole with rod chamber high pressure
406 communicate, and rod chamber low pressure connection oilhole 405, valve plate low pressure connection oilhole 411 connect oilhole 414 with rodless cavity low pressure and communicated.
The connected repairing hole 409 of rod chamber low pressure and rod chamber end oilhole 410 connect the low-pressure channel for importing and exporting valve plate 10 with rod chamber 27
Logical, rodless cavity end oilhole 412 and rodless cavity low pressure the repairing hole 413 that is connected will import and export the low-pressure channel and rodless cavity 28 of valve plate 10
It is connected, and is embedded in rod chamber repairing end check valve 26 and nothing respectively in rod chamber end oilhole 410 and rodless cavity end oilhole 412
Rod cavity repairing end check valve 29, makes system be only capable of unidirectional repairing.
As shown in fig. 6, rod chamber end electrohydraulic servo valve 1 and rodless cavity end electrohydraulic servo valve 11 analogize to 3-position-3-way electromagnetism
Reversal valve, P, T represent high pressure in-line and low pressure oil return line respectively in figure.When rodless cavity end electrohydraulic servo valve 11 is in right position
When, hydraulic oil connects oilhole 404 into rodless cavity end electrohydraulic servo valve 11 by importing and exporting valve plate 10 by valve plate high pressure, passes through
The throttling passage of electro-hydraulic servo valve inner flows into rodless cavity control connection oilhole 402, is further connected by rodless cavity accumulation of energy
Oilhole 401, on the one hand into rodless cavity 28, on the one hand act on rodless cavity end accumulator 14, compare rodless cavity end accumulator
14 internal inflation pressure come determine its punching, liquid of draining the oil.Pass through electric current of the adjustment effect on rodless cavity end electrohydraulic servo valve 11
Or magnitude of voltage, can be with the amount of opening of adjusting spool, and then adjust the flow and pressure into rodless cavity 28.Now, control has
Rod cavity end electrohydraulic servo valve 1 should be at left position, rod chamber 27 is connected with low pressure oil return line T, so as to the high pressure in rodless cavity 28
Fluid promotes piston rod 22 to stretch out, and compresses the volume of rod chamber 27, and its internal fluid connects oilhole 408 by rod chamber accumulation of energy
The inside that oilhole 407 enters rod chamber end electrohydraulic servo valve 1 is connected with rod chamber control, and then is connected by rod chamber low pressure
Oilhole 405 connects oilhole 411 with valve plate low pressure and imports and exports the subordinate equipment that valve plate 10 flows into hydraulic system, and piston rod 22 is stretched
Set out to complete.Pass through electric current or magnitude of voltage opening come adjusting spool of the adjustment effect on rod chamber end electrohydraulic servo valve 1
Mouth amount, and then outflow flow and outflow pressure are adjusted, so as to adjust the dynamic stiffness of making of servo hydraulic cylinder, real-time response in real time
The change of outer load, displacement transducer 8 constantly respond the overhang of piston rod 22, and pull pressure sensor 15 constantly responds servo-fluid
Cylinder pressure is used as power, and both can be accurately controlled the position output and power output of servo hydraulic cylinder as feedback signal, so as to
Obtain accurate power/position SERVO CONTROL.Due to the control of both-end electrohydraulic servo valve, for asymmetrical cylinder both ends into and out of
Flow can also be reciprocity, effectively reduces rodless cavity end hydraulic fluid port end pressure difference, efficiency of movement is done so as to improve.Both ends are electro-hydraulic
When servo valve is located at reverse of the above position, the retracting action of piston rod 22 is completed, the course of work is similar to the above.
When both ends, electrohydraulic servo valve is all located at middle position, rod chamber 27 and rodless cavity 28 are imported and exported oil circuit and blocked, now
If the load force mutation acted on piston rod 22, such as load pressure increase suddenly, the pressure of rodless cavity 28 is caused to increase suddenly,
The pressure of rod chamber 27 drops suddenly, and when pressure exceedes the blowing pressure of rodless cavity end accumulator 14, fluid flows into rodless cavity end and stored
In energy device 14, the internal oil of rodless cavity 28 reaches dynamic equilibrium when equal with rodless cavity end 14 internal gas pressures of accumulator, oil
Liquid is no longer flow into.Piston rod 22 is retracted in this dynamic process, so as to play buffering effect, reduces act pressure peak
Value, protects internal Sensitive Apparatus from the influence of impact.The volume of rod chamber 27 caused by the retraction of piston rod 22 increases, now
Covering fluid is entered by rod chamber end oilhole 410, rod chamber end repairing check valve 26, the connected repairing hole 409 of rod chamber low pressure
Rod chamber 27, avoid the appearance of cavitation.Dynamic process when piston rod 22 is by tensile load is similar with the former.By changing
Become the volume and the blowing pressure of both ends accumulator, effectively the buffering capacity of regulating piston bar 22 and dynamic elasticity can be made.
Claims (6)
1. a kind of energy-efficient hydraulic servo-cylinder controlled with bidirectional buffering and accurate power, including cylinder barrel, it is provided with cylinder barrel
The inner chamber of cylinder barrel is divided into rod chamber and rodless cavity by piston rod, piston rod, it is characterized in that：It is provided with cylinder barrel and is connected with rod chamber
Rod chamber end electrohydraulic servo valve and rod chamber end accumulator and the rodless cavity end electrohydraulic servo valve and nothing that are connected with rodless cavity
Rod cavity end accumulator, is provided with inlet and outlet valve plate on cylinder barrel, rodless cavity end electrohydraulic servo valve and rod chamber end electrohydraulic servo valve
High pressure hydraulic fluid port connects with importing and exporting the high-pressure channel of valve plate, rodless cavity end electrohydraulic servo valve and rod chamber end electrohydraulic servo valve it is low
Press oil port connects with importing and exporting the low-pressure channel of valve plate.
2. the energy-efficient hydraulic servo-cylinder controlled as claimed in claim 1 with bidirectional buffering and accurate power, it is characterized in that：
The piston rod is arranged in cylinder barrel by front end housing, and end cap end guide ring, piston rod are provided between piston rod and front end housing
One end in cylinder barrel is provided with piston end guide ring.
3. the energy-efficient hydraulic servo-cylinder controlled as claimed in claim 1 with bidirectional buffering and accurate power, it is characterized in that：
The cylinder barrel is provided with pull pressure sensor in one end of rodless cavity.
4. the energy-efficient hydraulic servo-cylinder controlled as claimed in claim 1 with bidirectional buffering and accurate power, it is characterized in that：
The displacement transducer of detection piston rod displacement is provided with the cylinder barrel.
5. the energy-efficient hydraulic servo-cylinder controlled as claimed in claim 1 with bidirectional buffering and accurate power, it is characterized in that：
The rodless cavity repairing passage that the rod chamber repairing passage connected with rod chamber is provided with the cylinder barrel and is connected with rodless cavity,
Repairing check valve is respectively provided with rod chamber repairing passage and rodless cavity repairing passage.
6. the energy-efficient hydraulic servo-cylinder controlled as claimed in claim 5 with bidirectional buffering and accurate power, it is characterized in that：
The rod chamber repairing passage and rodless cavity repairing passage connect with importing and exporting the low-pressure channel of valve plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720532853.9U CN206708114U (en) | 2017-05-15 | 2017-05-15 | The energy-efficient hydraulic servo-cylinder controlled with bidirectional buffering and accurate power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720532853.9U CN206708114U (en) | 2017-05-15 | 2017-05-15 | The energy-efficient hydraulic servo-cylinder controlled with bidirectional buffering and accurate power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206708114U true CN206708114U (en) | 2017-12-05 |
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ID=60463947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720532853.9U Expired - Fee Related CN206708114U (en) | 2017-05-15 | 2017-05-15 | The energy-efficient hydraulic servo-cylinder controlled with bidirectional buffering and accurate power |
Country Status (1)
| Country | Link |
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| CN (1) | CN206708114U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106979181A (en) * | 2017-05-15 | 2017-07-25 | 山东大学 | The energy-efficient hydraulic servo-cylinder controlled with bidirectional buffering and accurate power |
| CN109296584A (en) * | 2018-11-12 | 2019-02-01 | 大连君方科技有限公司 | A kind of hydraulic cylinder and method of automatic pressure control |
-
2017
- 2017-05-15 CN CN201720532853.9U patent/CN206708114U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106979181A (en) * | 2017-05-15 | 2017-07-25 | 山东大学 | The energy-efficient hydraulic servo-cylinder controlled with bidirectional buffering and accurate power |
| CN109296584A (en) * | 2018-11-12 | 2019-02-01 | 大连君方科技有限公司 | A kind of hydraulic cylinder and method of automatic pressure control |
| CN109296584B (en) * | 2018-11-12 | 2024-02-27 | 大连君方科技有限公司 | Hydraulic cylinder and method for automatically controlling pressure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171205 Termination date: 20190515 |