CN104564908A - Buffer hydraulic cylinder - Google Patents
Buffer hydraulic cylinder Download PDFInfo
- Publication number
- CN104564908A CN104564908A CN201410852823.7A CN201410852823A CN104564908A CN 104564908 A CN104564908 A CN 104564908A CN 201410852823 A CN201410852823 A CN 201410852823A CN 104564908 A CN104564908 A CN 104564908A
- Authority
- CN
- China
- Prior art keywords
- piston
- plunger rod
- cylinder body
- cylinder
- steel ball
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/063—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid comprising a hollow piston rod
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/068—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid where the throttling of a gas flow provides damping action
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3214—Constructional features of pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3221—Constructional features of piston rods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3235—Constructional features of cylinders
- F16F9/325—Constructional features of cylinders for attachment of valve units
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
- F16F9/3405—Throttling passages in or on piston body, e.g. slots
Abstract
The invention discloses a buffer hydraulic cylinder and belongs to the technical field of hydraulic cylinder structure. Two groups of stepped through holes are machined in the piston face of a piston, the first group of stepped through holes are steel ball installing valve holes, and steel balls are limited in the stepped through holes through retainer rings and can axially move in the stepped through holes. The other group of stepped through holes are variable-diameter holes. A plunger rod is matched with the front end of a cylinder body, the end located in the cylinder body, of the plunger rod, is sleeved with the piston, the outer circle circumference of the piston is matched with the inner wall of the cylinder body, the front end face of the piston is sleeved with a gland, the cylinder body is closed by the cylinder bottom, the piston divides the inner cavity of the cylinder body into two independent cavities including a rod cavity and a rodless cavity, and the rodless cavity is communicated with a column-shaped cavity of the plunger rod. An air piston is installed in the column-shaped cavity of the plunger rod. Sealing parts are installed on the matching faces between the plunger rod and the piston and the cylinder body. The oil input and oil output of the hydraulic cylinder are controlled without dependence on a hydraulic pump station, but a good buffer role can be played.
Description
Technical field
The present invention relates to a kind of buffering hydraulic cylinder, belong to hydraulic cylinder structure technical field.
Background technique
For oil hydraulic cylinder, especially double-acting hydraulic cylinder, when running fast, general backhaul hourly velocity is all than comparatively fast, thus needs to arrange damping device at end of travel.But due to the restriction by oil hydraulic cylinder inner space, not necessarily can requirement be reached at the cushioning effect of end of travel.Especially when the load of the large quality of Driven by Hydraulic Cylinder, because kinetic energy is excessive, hard hit phenomenon between piston and cylinder bottom, guide sleeve can be produced at end of travel, affect normal service life and the precision of oil hydraulic cylinder greatly.
Summary of the invention
In view of this, the invention provides a kind of buffering hydraulic cylinder, do not need to rely on the oil-feed of hydraulic power unit hydraulic control cylinder and fuel-displaced, but can play good buffer function.
A kind of buffering hydraulic cylinder, comprises gas charging valve, plunger rod, cylinder body, Sealing, gas piston, piston, steel ball, baffle ring, gland and cylinder bottom;
One end end face of described plunger rod is processed with cambered surface groove, and this cambered surface groove coordinates with by the vibration position of dampening apparatus, and this end is provided with gas charging valve, and the other end of plunger rod is cylindrical cavity;
The piston area of described piston is processed with two groups of step through-holes, first group of step through-hole is that valve opening installed by steel ball, and steel ball is limited in step hole by baffle ring, and baffle ring and steel ball are mating spherical surfaces, and steel ball can move axially in step hole; Another group step hole is variable diameters hole, and the piston area installing steel ball one end is large diameter hole, and the piston area of the other end is small diameter bore; In addition, piston is also processed one group of throttle orifice;
Its integrated connection closes: described plunger rod coordinates with the front end of cylinder body, described piston sleeve is contained in one end that plunger rod is positioned at cylinder body, outside piston side face coordinates with the inwall of cylinder body, described gland is sleeved on the front-end face of piston, cylinder body is closed by described cylinder bottom, inner chamber of cylinder block is separated into two independently cavitys by described piston, is bar chamber and rodless cavity respectively, and the cylindrical cavity on rodless cavity and plunger rod is through; The cylindrical cavity of described plunger rod is built with gas piston; The fitting surface of described plunger rod and piston and cylinder body is all provided with Sealing.
Further, be filled with inert gas in the cavity airtight by gas piston of described plunger rod, in described cylinder body, be filled with hydraulic oil;
Further, on described cylinder body, the position of corresponding rod chamber is provided with Decompression valves.
Beneficial effect:
(1) the present invention utilizes pressure difference and difference in areas principle, by inert gas the pressure difference that produces by compression, carry out the flow direction of hydraulic control oil, by the pulsation of steel ball with fluid, and the difference in areas of throttle orifice, carry out the uninterrupted of hydraulic control oil, reach the effect of buffering.Its principle is simple, novel structure, easy for installation, use reliable.
(2) the present invention is processed with two kinds of step holes on piston.The step surface of step hole is provided with a steel ball, outside steel ball, has valve seat.Thrust when utilizing hydraulic oil to move, makes steel ball fit with the arc surface on valve seat or be separated, i.e. cut-off valve bore or open valve seat orifice, carrys out the uninterrupted of hydraulic control oil.Another kind of step hole is the through hole of reducing, and when hydraulic oil moves from rod chamber to rodless cavity, step hole changes from small to big, and running of hydraulic power oil speed is comparatively slow, when hydraulic oil moves from rodless cavity to rod chamber, step hole from large to small, running of hydraulic power oil speed.Carry out uninterrupted when hydraulic control oil moves by these two kinds of step holes, reach the object of buffering.Its overall structure is novel, and processing is simple, and easy for installation, using effect is good.
(3) oil hydraulic cylinder of the present invention is filled with inert gas and hydraulic oil before use according to a certain percentage respectively, carrys out the oil-feed of hydraulic control cylinder and fuel-displaced without the need to arranging hydraulic power unit.It is easy to use, safeguards simple, clean environment.
(4) plunger rod, piston and valve seat are made split-type structural by the present invention, steel ball is placed with between the step hole of piston and valve seat, utilize the end face of buffer body by seat compression, make hydraulic oil in flow process, steel ball and valve seat can not come off, and its structure is simple, easy for installation, use is reliable and cost is low.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention;
Fig. 2 is the structural representation of original state of the present invention;
Fig. 3 is the structural representation of limited compression position of the present invention;
Fig. 4 is the structural representation of piston in the present invention;
Fig. 5 is the D-D view of Fig. 4;
Fig. 6 is the E-E view of Fig. 4.
Wherein, 1-gas charging valve, 2-plunger rod, 3-cylinder body, 4-Sealing, 5-gas piston, 6-piston, 7-steel ball, 8-baffle ring, 9-gland, 10-cylinder bottom.
Embodiment
To develop simultaneously embodiment below in conjunction with accompanying drawing, describe the present invention.
As shown in Figure 1, the invention provides a kind of buffering hydraulic cylinder, comprise gas charging valve 1, plunger rod 2, cylinder body 3, Sealing 4, gas piston 5, piston 6, steel ball 7, baffle ring 8, gland 9, cylinder bottom 10;
One end end face of described plunger rod 2 is processed with cambered surface groove, and this cambered surface groove coordinates with by the vibration position of dampening apparatus, and this end is provided with gas charging valve 1, and the other end of plunger rod 2 is cylindrical cavity;
As shown in accompanying drawing 4,5 and 6, the piston area of described piston 6 is processed with two groups of step through-holes, first group of step through-hole is that valve opening installed by steel ball, and steel ball is limited in step hole by baffle ring 8, baffle ring 8 and steel ball are mating spherical surfaces, and steel ball can move axially in step hole; Another group step hole is variable diameters hole, and the piston area installing steel ball 7 one end is large diameter hole, and the piston area of the other end is small diameter bore; In addition, piston 6 is also processed one group of throttle orifice;
Its integrated connection closes: described plunger rod coordinates with the front end of cylinder body 3, described piston 6 is sleeved on one end that plunger rod is positioned at cylinder body, outside piston side face coordinates with the inwall of cylinder body 3, described gland 9 is sleeved on the front-end face of piston 6, cylinder body 3 is closed by described cylinder bottom 10, cylinder body 3 inner chamber is separated into two independently cavitys by described piston 6, is bar chamber and rodless cavity respectively, and the cylindrical cavity on rodless cavity and plunger rod 2 is through; The cylindrical cavity of described plunger rod 2 is built with gas piston 5; The fitting surface of described plunger rod 2 and piston 6 and cylinder body 3 is all provided with Sealing 4;
Further, be filled with inert gas in the cavity airtight by gas piston 5 of described plunger rod 2, in described cylinder body, be filled with hydraulic oil;
Further, on described cylinder body 3, the position of corresponding rod chamber is provided with Decompression valves.
Working principle: buffering hydraulic cylinder is mainly used in the impact shock produced when absorbing the test of rock drill product impact property.Be filled with a certain proportion of inert gas and hydraulic oil to buffering hydraulic cylinder, and buffering hydraulic cylinder cylinder bottom is fixed.
In buffering course, retract after the cambered surface groove of plunger rod 2 is subject to the impact force of certain frequency, now steel ball is away from valve seat arc surface, valve opening is opened, in rodless cavity, a part of hydraulic oil is moved to rod chamber by the valve opening on piston and throttle orifice, another part hydraulic oil promotes gas piston, is compressed by inert gas, slows down the operation of oil hydraulic cylinder.When piston 6 runs to certain position, buffer body starts the step surface entering into cylinder bottom 10, slows down the motion speed of plunger rod further.
Because inert gas is compressed, there is certain pressure difference in air chamber and hydraulic fluid chamber, and air chamber pressure is greater than hydraulic fluid chamber pressure, when after impact force release suffered by plunger rod 2, gas push gas piston 5, now hydraulic oil will promote piston, make plunger rod 2 outwards movement, and now steel ball 7 and baffle ring 8 arc surface are fitted, baffle ring 8 bore closure, rod chamber hydraulic oil can only be moved to rodless cavity by the throttle orifice on piston 6, therefore slows down the speed of the outside movement of plunger rod 2.When piston 6 moves to certain position, the buffer portion on piston 6 starts the step hole entered in cylinder body, slows down the speed that piston rod outwards runs further.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. a buffering hydraulic cylinder, it is characterized in that, comprise gas charging valve (1), plunger rod (2), cylinder body (3), Sealing (4), gas piston (5), piston (6), steel ball (7), baffle ring (8), gland 9, cylinder bottom 10;
One end end face of described plunger rod (2) is processed with cambered surface groove, and this cambered surface groove coordinates with by the vibration position of dampening apparatus, and this end is provided with gas charging valve (1), and the other end of plunger rod (2) is cylindrical cavity;
The piston area of described piston (6) is processed with two groups of step through-holes, first group of step through-hole is that valve opening installed by steel ball, steel ball (7) is limited in step hole by baffle ring (8), baffle ring (8) and steel ball (7) are mating spherical surfaces, and steel ball (7) can move axially in step hole; Another group step hole is variable diameters hole, and the piston area installing steel ball (7) one end is large diameter hole, and the piston area of the other end is small diameter bore; In addition, piston (6) also processes one group of throttle orifice;
Its integrated connection closes: described plunger rod coordinates with the front end of cylinder body (3), described piston (6) is sleeved on one end that plunger rod (2) is positioned at cylinder body (3), piston (6) outer peripheral surface coordinates with the inwall of cylinder body (3), described gland (9) is sleeved on the front-end face of piston (6), cylinder body (3) is closed by described cylinder bottom (10), cylinder body (3) inner chamber is separated into two independently cavitys by described piston (6), be bar chamber and rodless cavity respectively, the cylindrical cavity on rodless cavity and plunger rod (2) is through; The cylindrical cavity of described plunger rod (2) is built with gas piston (5); The fitting surface of described plunger rod (2) and piston (6) and cylinder body (3) is all provided with Sealing (4).
2. buffering hydraulic cylinder as claimed in claim 1, is characterized in that, be filled with inert gas in the cavity airtight by gas piston (5) of described plunger rod 2, described cylinder body is filled with hydraulic oil in (3).
3. buffering hydraulic cylinder as claimed in claim 1 or 2, is characterized in that, the position of the upper corresponding rod chamber of described cylinder body (3) is provided with Decompression valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410852823.7A CN104564908A (en) | 2014-12-31 | 2014-12-31 | Buffer hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410852823.7A CN104564908A (en) | 2014-12-31 | 2014-12-31 | Buffer hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104564908A true CN104564908A (en) | 2015-04-29 |
Family
ID=53081748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410852823.7A Pending CN104564908A (en) | 2014-12-31 | 2014-12-31 | Buffer hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104564908A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105351274A (en) * | 2015-12-14 | 2016-02-24 | 陈鸽 | Energy consumer and mechanical switch |
| CN105402183A (en) * | 2015-12-14 | 2016-03-16 | 陈鸽 | Energy consumption device and switch gear |
| CN105972137A (en) * | 2016-05-17 | 2016-09-28 | 重庆德盟液压机械有限公司 | Hydro-pneumatic spring cylinder externally provided with energy accumulator |
| CN106594151A (en) * | 2016-12-05 | 2017-04-26 | 重集团大连设计研究院有限公司 | Blanking buffer cylinder based on damping principle |
| CN106945324A (en) * | 2017-04-27 | 2017-07-14 | 平湖市通力机械有限公司 | A kind of high-mechanic gate-type forcing press |
| CN107882806A (en) * | 2017-09-30 | 2018-04-06 | 重庆维庆液压机械有限公司 | The method of work of anti-tamper hydraulic cylinder |
| CN108240370A (en) * | 2018-02-09 | 2018-07-03 | 武汉船用机械有限责任公司 | Damper piston |
| CN109654086A (en) * | 2019-01-02 | 2019-04-19 | 中船重工中南装备有限责任公司 | A kind of loaded hydraulic cylinder of high frequency |
| CN110735824A (en) * | 2019-10-25 | 2020-01-31 | 长沙理工大学 | Hydraulic cylinder of air port buffer device |
| GB2576783A (en) * | 2018-09-03 | 2020-03-04 | Caterpillar Global Mining Llc | Apparatus for operating a machine work tool |
| WO2020116142A1 (en) * | 2018-12-05 | 2020-06-11 | 株式会社クボタ | Lift arm raising and lowering mechanism |
| CN111577702A (en) * | 2020-05-25 | 2020-08-25 | 北京特种机械研究所 | Buffering method of hydraulic actuating cylinder at stroke starting end |
| CN111577701A (en) * | 2020-05-25 | 2020-08-25 | 北京特种机械研究所 | Hydraulic actuator cylinder with stroke starting end buffering function |
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| JPS5680504A (en) * | 1979-12-07 | 1981-07-01 | Tokyu Car Corp | Brake device for single-acting cylinder |
| CN2615406Y (en) * | 2003-04-29 | 2004-05-12 | 天津特精液压股份有限公司 | Piston type single-action damper hydraulic cylinder |
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| CN203743118U (en) * | 2013-12-30 | 2014-07-30 | 中船重工中南装备有限责任公司 | Hydraulic cylinder with buffering structure |
| CN204419758U (en) * | 2014-12-31 | 2015-06-24 | 中船重工中南装备有限责任公司 | A kind of buffering hydraulic cylinder |
-
2014
- 2014-12-31 CN CN201410852823.7A patent/CN104564908A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5680504A (en) * | 1979-12-07 | 1981-07-01 | Tokyu Car Corp | Brake device for single-acting cylinder |
| CN2615406Y (en) * | 2003-04-29 | 2004-05-12 | 天津特精液压股份有限公司 | Piston type single-action damper hydraulic cylinder |
| CN201166022Y (en) * | 2008-02-27 | 2008-12-17 | 长沙中联重工科技发展股份有限公司 | Hydraulic pressure accumulator oil cylinder for crane |
| CN201198853Y (en) * | 2008-05-15 | 2009-02-25 | 内蒙古北方重型汽车股份有限公司 | Buffering device of automobile hanging cylinder |
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105402183A (en) * | 2015-12-14 | 2016-03-16 | 陈鸽 | Energy consumption device and switch gear |
| CN105351274A (en) * | 2015-12-14 | 2016-02-24 | 陈鸽 | Energy consumer and mechanical switch |
| CN105972137A (en) * | 2016-05-17 | 2016-09-28 | 重庆德盟液压机械有限公司 | Hydro-pneumatic spring cylinder externally provided with energy accumulator |
| CN106594151A (en) * | 2016-12-05 | 2017-04-26 | 重集团大连设计研究院有限公司 | Blanking buffer cylinder based on damping principle |
| CN106945324A (en) * | 2017-04-27 | 2017-07-14 | 平湖市通力机械有限公司 | A kind of high-mechanic gate-type forcing press |
| CN107882806B (en) * | 2017-09-30 | 2019-07-30 | 重庆维庆液压机械有限公司 | The working method of anti-tamper hydraulic cylinder |
| CN107882806A (en) * | 2017-09-30 | 2018-04-06 | 重庆维庆液压机械有限公司 | The method of work of anti-tamper hydraulic cylinder |
| CN108240370A (en) * | 2018-02-09 | 2018-07-03 | 武汉船用机械有限责任公司 | Damper piston |
| GB2576783A (en) * | 2018-09-03 | 2020-03-04 | Caterpillar Global Mining Llc | Apparatus for operating a machine work tool |
| GB2576783B (en) * | 2018-09-03 | 2021-01-06 | Caterpillar Global Mining Llc | Apparatus for operating a machine work tool |
| WO2020116142A1 (en) * | 2018-12-05 | 2020-06-11 | 株式会社クボタ | Lift arm raising and lowering mechanism |
| JPWO2020116142A1 (en) * | 2018-12-05 | 2021-11-04 | 株式会社クボタ | Lift arm lifting mechanism |
| EP3892867A4 (en) * | 2018-12-05 | 2022-08-10 | Kubota Corporation | Lift arm raising and lowering mechanism |
| US11434941B2 (en) | 2018-12-05 | 2022-09-06 | Kubota Corporation | Lift arm lifting and lowering mechanism |
| JP7236463B2 (en) | 2018-12-05 | 2023-03-09 | 株式会社クボタ | Lift arm lifting mechanism |
| CN109654086A (en) * | 2019-01-02 | 2019-04-19 | 中船重工中南装备有限责任公司 | A kind of loaded hydraulic cylinder of high frequency |
| CN109654086B (en) * | 2019-01-02 | 2023-12-01 | 中船重工中南装备有限责任公司 | High-frequency loaded hydraulic cylinder |
| CN110735824A (en) * | 2019-10-25 | 2020-01-31 | 长沙理工大学 | Hydraulic cylinder of air port buffer device |
| CN111577702A (en) * | 2020-05-25 | 2020-08-25 | 北京特种机械研究所 | Buffering method of hydraulic actuating cylinder at stroke starting end |
| CN111577701A (en) * | 2020-05-25 | 2020-08-25 | 北京特种机械研究所 | Hydraulic actuator cylinder with stroke starting end buffering function |
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