CN103925259A - Hydraulic-pneumatic cylinder piston - Google Patents
Hydraulic-pneumatic cylinder piston Download PDFInfo
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- CN103925259A CN103925259A CN201410192263.7A CN201410192263A CN103925259A CN 103925259 A CN103925259 A CN 103925259A CN 201410192263 A CN201410192263 A CN 201410192263A CN 103925259 A CN103925259 A CN 103925259A
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Abstract
The invention discloses a hydraulic-pneumatic cylinder piston. The hydraulic-pneumatic cylinder piston comprises a piston body, wherein at least one buffering mechanism is arranged on the piston body. The buffering mechanisms are mainly composed of buffering shell bodies, pressure releasing valves, first plugs and second plugs, wherein the buffering shell bodies, the pressure releasing valves, the first plugs and the second plugs are arranged in the piston body. Pressure releasing holes are formed in the buffering shell bodies, flow guide holes led to the inner portions of the pressure releasing holes are formed in the left end faces of the buffering shell bodies and the right end faces of the buffering shell bodies respectively, the two flow guide holes in each pressure releasing hole correspond to each other, annular pressure releasing grooves are formed in the middle circumferences of the pressure releasing valves, the annular pressure releasing grooves are assembled in the pressure releasing holes, the width of the pressure releasing grooves corresponds to the diameter of the flow guide holes in the pressure releasing holes, pressure inducing holes are formed in the first plugs and the second plugs respectively, the first plugs and the second plugs are assembled at the two ends of the pressure releasing holes respectively, the flow guide holes in the pressure releasing holes and the pressure releasing valves in the pressure releasing holes are located between the first plugs and the second plugs, reciprocating spaces of the pressure releasing valves are formed in the pressure releasing holes between the first plugs and the second plugs, and the pressure releasing grooves are plugged when the pressure releasing valves are located at the stroke end points in the reciprocating spaces. On the load condition, the speed of the pressure releasing valves is reduced to zero when the pressure releasing valves reach the stroke end points and work is reliable.
Description
Technical field
The present invention relates to the piston moving back and forth in oil hydraulic cylinder or cylinder.
Background technique
Oil hydraulic cylinder or cylinder are in the time of work, piston in its cylinder body is under the effect of acting medium (hydraulic oil or pressurized air), motion speed is higher, thereby large (this is especially remarkable with large quality piston) of the inertial force of piston operation, cause piston can form larger impulsive load in stroke end, with cylinder bottom or the end cap generation mechanical collision of cylinder body, this not only causes impact shock and noise, and easily damages cylinder body (normally hit pine, even shoot down end cap or the cylinder bottom on cylinder body).Thereby, for oil hydraulic cylinder or cylinder design buffer structure is absolutely necessary.
At present, the buffer structure of oil hydraulic cylinder or cylinder mainly contains two kinds of set-up modes.On a kind of control loop that is arranged on cylinder body outside, its exist complex structure, volume large, make trouble, the defect such as manufacture cost height.Another kind is arranged on the piston of cylinder interior, this setup or be the buffering of utilizing the acting medium in cylinder body directly to carry out piston operation, for example Chinese patent literature disclosed " a kind of buffering hydraulic oil cylinder " (publication number: CN 203161708, open day: on August 28th, 2013), " buffering hydraulic oil cylinder " (publication number: CN 203374549, open day: on January 1st, 2014); The buffering of utilizing elastic member to carry out piston operation, for example Chinese patent literature disclosed " two-way automatic buffer hydraulic jack " (publication number: CN 202768523, open day: on March 6th, 2013); Although they compare have advantages of simple in structure, volume is little, easily manufactured, low cost of manufacture, but there is the problem of practicability and poor reliability, this be because: the buffering of utilizing the acting medium in cylinder body directly to carry out piston operation, just must guarantee reserved a certain amount of acting medium in cylinder body, acting medium reservation too much can effectively improve cushioning effect, otherwise can affect cushioning effect, thereby increase the design difficulty of this oil hydraulic cylinder or cylinder control loop, poor operability, practical not; Utilize elastic member to carry out the buffering of piston operation, though avoided the cylinder bottom of piston and cylinder body or the collision of the direct mechanical of end cap, but elastic member all the time in the to-and-fro motion process of piston with cylinder bottom or the end cap contact-impact repeatedly of cylinder body, this contact-impact is unlikely to damage cylinder body in a short time, but the impact shock causing and noise cannot be eliminated all the time, poor reliability.
Summary of the invention
The object of the invention is to: for above-mentioned the deficiencies in the prior art, provide a kind of simple in structure, easily manufactured, low cost of manufacture, good operability, good buffer effect, high, the practical liquid gas pressure cylinder piston of reliability.
The technical solution used in the present invention is: a kind of liquid gas pressure cylinder piston, comprise piston body, and described piston body is provided with the damping mechanism of at least one release, described damping mechanism is mainly by the bumper housing being arranged in piston body, pressure-relief valve, the first screw plug and the second screw plug form, described bumper housing is provided with the pressure relief vent of axial hole shape, and be provided with the first pod apertures that passes to pressure relief vent inside in the left side of bumper housing, right side is provided with the second pod apertures that passes to pressure relief vent inside, the first pod apertures in pressure relief vent is corresponding with the second pod apertures, the middle part circumference of described pressure-relief valve is provided with annular pressure relief groove, pressure-relief valve is assemblied in pressure relief vent, pod apertures diameter in the corresponding pressure relief vent of pressure relief groove width on pressure-relief valve, on described the first screw plug and the second screw plug, be respectively equipped with the tracting pressuring hole of axial hole shape, the first screw plug and the second screw plug are assemblied in the two ends of pressure relief vent, pod apertures in pressure relief vent and pressure-relief valve are between the first screw plug and the second screw plug, pressure relief vent between the first screw plug and the second screw plug forms the past complex space of pressure-relief valve, pressure-relief valve is in complex space during in stroke end, pressure relief groove on pressure-relief valve is relaxed hole shutoff.
Further, the pressure-relief valve two ends end face of described damping mechanism is respectively equipped with elastomer.
Further, the first screw plug of described damping mechanism and the second screw plug are respectively inner axial raised convex cone structure.
Further, on the pressure-relief valve two ends circumference of described damping mechanism, be filled with respectively seal ring.
Further, the pod apertures diameter on the bumper housing of described damping mechanism is 0.5～5mm.
Further, the bumper housing of described damping mechanism and piston body are structure as a whole or Split type structure.
Further, the damping mechanism on described piston body is three or four.
Further, the circumference of described piston body is provided with the annular seal groove of at least one filling sealed circle.
Further, on described piston body, be connected with piston rod.
The invention has the beneficial effects as follows: by the damping mechanism of release is set on piston body, make this piston applications in the time of oil hydraulic cylinder or cylinder, walk to stroke end place and produce release buffering, now the hyperbaric chamber of cylinder body (the pressurising side of piston) internal pressure declines, low-pressure cavity (the row pressure side of piston) internal pressure increases, thereby the pressure in low-pressure cavity is kept out, eliminate the inertial force of piston, until make with load piston arrives stroke end time slow down be zero, stop the cylinder bottom of piston to cylinder body or the impact of end cap, effectively extended the working life of whole oil hydraulic cylinder or cylinder, reliable operation.The present invention compares, and has the features such as simple in structure, easily manufactured, low cost of manufacture, good operability, good buffer effect, reliability be high and practical.
Brief description of the drawings
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Fig. 1 is a kind of structural representation of the present invention.
Fig. 2 is the A-A view of Fig. 1.
Fig. 3 is the partial enlarged drawing of Fig. 2.
Code name implication in figure: 1-piston body; 11-seal groove; 12-piston rod; 2-damping mechanism; 21-bumper housing; 22-pressure relief vent; 23-pressure-relief valve; 24-pressure relief groove; The 25-the first pod apertures; The 26-the first screw plug; The 27-the second pod apertures; The 28-the second screw plug; 29-elastomer; The 210-the first tracting pressuring hole; The 211-the second tracting pressuring hole.
Embodiment
The present invention is applied to oil hydraulic cylinder or cylinder, enters, discharges according to acting medium (hydraulic oil or pressurized air) in oil hydraulic cylinder or cylinder the acting that moves back and forth.Now describe the present invention as an example of oil hydraulic cylinder example in detail in conjunction with following embodiment.
embodiment 1
Referring to Fig. 1, Fig. 2 and Fig. 3: the present invention includes piston body 1 and be arranged in the damping mechanism 2 of release on piston body 1.
Wherein, piston body 1 is certain thickness round column structure, and its one-tenth-value thickness 1/10, diameter value are rationally determined according to applied oil hydraulic cylinder performance.On the circumference of piston body 1, be provided with the annular seal groove 11 of the four filling sealed circles in road, the quantity of sealing groove 11 is rationally determined according to the performance of oil hydraulic cylinder equally, for example twice, three roads etc., be mainly used for preventing oil hydraulic cylinder in the course of the work hydraulic oil arbitrarily leak to low-pressure cavity (being the row pressure side of piston) from hyperbaric chamber (being the pressurising side of piston).On aforementioned piston body 1, be connected with piston rod 12, this piston rod 12 assembles and extends from the cylinder bottom sealing of oil hydraulic cylinder.
The damping mechanism 2 of release is four, and their annulars centered by piston rod 12 are distributed on piston body 1.As for damping mechanism 2 quantity on piston body 1, also be rationally to determine according to the performance height of oil hydraulic cylinder, the damping mechanism more than 2 of arranging on piston body 1, when piston walks to stroke end, release cushioning effect is better, preferably, on piston body 1, arrange that three or four just can fully be realized goal of the invention of the present invention, if only arrange the damping mechanism 2 of a release on piston body 1, though can realize goal of the invention of the present invention to the oil hydraulic cylinder of low performance, but in order to keep piston operation balance, require this damping mechanism 2 to be in the center of piston body 1, now for conducting acting medium, certainly will require to offer conduction hole on piston rod 12 communicates with damping mechanism 2.
The structure of four release damping mechanisms 2 on above-mentioned piston body 1 is identical.Each damping mechanism 2 is mainly made up of the bumper housing 21, pressure-relief valve 23, the first screw plug 26 and the second screw plug 28 that are arranged in piston body 1.
Above-mentioned bumper housing 21 is Split type structure with piston body 1.The column structure (arranging of ledge structure is mainly for the ease of arrange assembling on piston body 1) that the outer wall profile of bumper housing 21 is step, the height of bumper housing 21 equates with the thickness of piston body 1.The pressure relief vent 22(that is provided with axial hole shape at bumper housing 21 center is that the two ends of pressure relief vent 22 communicate with two end faces of bumper housing 21 respectively), in two end hole wall sections of pressure relief vent 22, be provided with connecting thread; And be provided with the first pod apertures 25, the right side that pass to pressure relief vent 22 middle parts in the left side of bumper housing 21 and be provided with the second pod apertures 27 that passes to pressure relief vent 22 middle parts, the first pod apertures 25 and the second pod apertures 27 are L-shaped respectively, and the first pod apertures 25 in pressure relief vent 22 is corresponding with the position of the second pod apertures 27; The diameter range value of aforementioned the first pod apertures 25 and the second pod apertures 27 is respectively 0.5～5mm, for example 0.8mm, or 1.9mm, or 3.2mm, and also or 4.7mm etc., the selection of occurrence need to be determined according to the performance height of oil hydraulic cylinder.When damping mechanism 2 is arranged assembling on piston body 1, on piston body 1, be preset with the through hole of the bumper housing 21 outer wall profiles of coupling damping mechanism 2, this through hole communicates respectively with left side and the right side of piston body 1, aforementioned bumper housing 21 correspondences, sealing are inlaid in the through hole of piston body 1, and be aided with screw fastening, be assemblied in the left and right end face of bumper housing 21 on piston body 1 respectively with the left and right end face of piston body 1.
The length of above-mentioned pressure-relief valve 23 is less than the length of pressure relief vent 22 on bumper housing 21, but the diameter of the diameter correspondence of pressure-relief valve 23, coupling pressure relief vent 22.Be respectively equipped with elastomer 29(such as rubber elastic material or metal clips etc. at pressure-relief valve 23 two ends end faces), in order to facilitate elastomer 29 fixing at pressure-relief valve 23 end faces, end face at pressure-relief valve 23 offers groove, elastomer 29 is inlaid in the end face groove of pressure-relief valve 23, can effectively improve pressure-relief valve 23 reciprocal reliability in the course of the work by arranging of elastomer 29.On the circumference of the middle part of pressure-relief valve 23, be provided with annular pressure relief groove 24, the width of this pressure relief groove 24 is answered pod apertures (i.e. the first pod apertures 25 and the second pod apertures 27) diameter in corresponding pressure relief vent 22, the width range value that is pressure relief groove 24 is 0.5～5mm, for example 0.8mm, or 1.9mm, or 3.2mm, also or 4.7mm etc.; On pressure-relief valve 23 circumference of pressure relief groove 24 both sides, be filled with seal ring respectively with mode of grooving, the seal ring on pressure-relief valve 23 is on end, the two ends circumference of pressure-relief valve substantially.Pressure-relief valve 23 is assemblied in pressure relief vent 22, and the pressure-relief valve 23 being assemblied in pressure relief vent 22 contacts sealing by seal ring with the hole wall of pressure relief vent 22.
Above-mentioned the first screw plug 26 is identical with the structure of the second screw plug 28, and just their assemblings are in the diverse location of bumper housing 21; The external diameter of the first screw plug 26 and the second screw plug 28 respectively with bumper housing 21 on pressure relief vent 22 diameters match, and on the circumference of the first screw plug 26 and the second screw plug 28, be respectively equipped with the connecting thread of screw thread on corresponding pressure relief vent 22.On the first screw plug 26 and the second screw plug 28, being respectively equipped with the tracting pressuring hole of axial hole shape, on the first screw plug 26 is on the first tracting pressuring hole 210, the second screw plugs 28 to be the second tracting pressuring hole 211.The first screw plug 26 and the second screw plug 28 are assemblied in the two ends of pressure relief vent 22 threadably, pod apertures (i.e. the first pod apertures 25 and the second pod apertures 27) and pressure-relief valve 23 in pressure relief vent 22 are between the first screw plug 26 and the second screw plug 28, and the pressure relief vent 22 between the first screw plug 26 and the second screw plug 28 forms the past complex space of pressure-relief valve 23; Equally, in order effectively to improve pressure-relief valve 23 reciprocal reliability in the course of the work, the first screw plug 26 and the second screw plug 28 are respectively inner axial raised convex cone structure, the inner external diameter of convex cone is less than the diameter of elastomer 29 on pressure-relief valve 23, so just can guarantee that the elastomer 29 on the pressure-relief valve 23 in to-and-fro motion contacts with the first screw plug 26 or the second screw plug 28, storage elasticity; Pressure-relief valve 23 is in complex space during in stroke end, the end face that is pressure-relief valve 23 contacts with the first screw plug 26 or the second screw plug 28 while attaching, must guarantee that the pressure relief groove 24 on pressure-relief valve 23 is relaxed the hole wall shutoff in hole 22, this is the first screw plug 26 and the rigging position requirement of the second screw plug 28 in the pressure relief vent 22 of bumper housing 21 namely.
The working procedure that the present invention is applied to oil hydraulic cylinder is: the low-pressure cavity that the hyperbaric chamber that the chamber of setting piston left side is pressurising, the chamber on right side are row pressure, and piston is operation from left to right under the effect of hydraulic oil, in running, hydraulic oil in hyperbaric chamber enters in the pressure relief vent 22 of bumper housing 21 by the first tracting pressuring hole 210 on the first screw plug 26, pressure-relief valve 23 right laterals, right side and the second screw plug 28 are attached, now the pressure relief groove 24 on pressure-relief valve 23 is relaxed pod apertures (i.e. the first pod apertures 25 and the second pod apertures 27) in hole 22 hole wall shutoff, pressure relief vent 22 and is relaxed the outer wall shutoff of valve 23, the first pod apertures 25 on bumper housing 21 and the second pod apertures 27 cannot conductings, and the hydraulic oil of hyperbaric chamber also cannot enter low-pressure cavity, in the time that piston walks to stroke end, during near the end cap of cylinder body or cylinder bottom, the interior remaining hydraulic oil of low-pressure cavity is the right side at pressure-relief valve 23 by the second tracting pressuring hole 211 momentary actions on the second screw plug 28, pressure-relief valve 23 is forced to moment and moves left, it is more reliable under auxiliary that this operates in elastomer on right side 29, just in this process of moment operation, pressure relief groove 24 on pressure-relief valve 23 corresponds to the first pod apertures 25 and the second pod apertures 27 places, the first pod apertures 25 on bumper housing 21 and the second pod apertures 27 conductings, a little hydraulic oil in hyperbaric chamber moment under High Pressure drains into low-pressure cavity, in addition pressure-relief valve 23 is at height, under low-pressure cavity pressure and self flexible effect, repeatedly move back and forth, this process makes the remarkable step-down of hyperbaric chamber, the remarkable supercharging of low-pressure cavity, the pressure increasing in low-pressure cavity is kept out, eliminate the inertial force of piston, until make with load piston arrives stroke end time slow down be zero, the low-pressure cavity that the hyperbaric chamber that to set the chamber on piston right side be pressurising, the chamber in left side are row pressure, piston is operation from right to left under the effect of hydraulic oil, and its operation, buffering course and above-mentioned from left to right contrary, do not repeat them here.
embodiment 2
Other structure of the present embodiment is identical with embodiment 1, difference is: the bumper housing and the piston body that form damping mechanism are structure as a whole, be that piston body self also serves as bumper housing, offer the pressure relief vent of axial hole shape in the precalculated position (position of namely assembling damping mechanism in embodiment 1) of piston body, in two end hole wall sections of this pressure relief vent, be provided with connecting thread, and near piston body left side this pressure relief vent is provided with the first pod apertures, the right side that pass to pressure relief vent middle part and is provided with the second pod apertures that passes to pressure relief vent middle part.This pressure relief vent and the pod apertures (i.e. the first pod apertures and the second pod apertures) originally arranging with it at piston body makes piston body itself form bumper housing, and the two combines together.
The present embodiment is compared, and has simplified to a certain extent modular construction and quantity, still, due to the pod apertures small aperture that is several millimeters, thereby the operation easier of offering the irregular pod apertures of this " L shaped " on piston body is increased to a certain extent.
Claims (9)
1. a liquid gas pressure cylinder piston, comprises piston body (1), and described piston body (1) is provided with the damping mechanism (2) of at least one release, it is characterized in that: described damping mechanism (2) is mainly by the bumper housing (21) being arranged in piston body (1), pressure-relief valve (23), the first screw plug (26) and the second screw plug (28) form, described bumper housing (21) is provided with the pressure relief vent (22) of axial hole shape, and be provided with in the left side of bumper housing (21) and pass to inner the first pod apertures (25) of pressure relief vent (22), right side is provided with and passes to inner the second pod apertures (27) of pressure relief vent (22), the first pod apertures (25) and the second pod apertures (27) in pressure relief vent (22) are corresponding, the middle part circumference of described pressure-relief valve (23) is provided with annular pressure relief groove (24), pressure-relief valve (23) is assemblied in pressure relief vent (22), pod apertures diameter in the corresponding pressure relief vent of pressure relief groove (24) width (22) on pressure-relief valve (23), on described the first screw plug (26) and the second screw plug (28), be respectively equipped with the tracting pressuring hole of axial hole shape, the first screw plug (26) and the second screw plug (28) are assemblied in the two ends of pressure relief vent (22), pod apertures and pressure-relief valve (23) in pressure relief vent (22) are between the first screw plug (26) and the second screw plug (28), pressure relief vent (22) between the first screw plug (26) and the second screw plug (28) forms the past complex space of pressure-relief valve (23), pressure-relief valve (23) is in complex space during in stroke end, pressure relief groove (24) on pressure-relief valve (23) is relaxed hole (22) shutoff.
2. liquid gas pressure cylinder piston according to claim 1, is characterized in that: pressure-relief valve (23) the two ends end face of described damping mechanism (2) is respectively equipped with elastomer (29).
3. according to liquid gas pressure cylinder piston described in claim 1 or 2, it is characterized in that: first screw plug (26) of described damping mechanism (2) and the second screw plug (28) are respectively inner axial raised convex cone structure.
4. according to liquid gas pressure cylinder piston described in claim 1 or 2, it is characterized in that: on pressure-relief valve (23) the two ends circumference of described damping mechanism (2), be filled with respectively seal ring.
5. liquid gas pressure cylinder piston according to claim 1, is characterized in that: the pod apertures diameter on the bumper housing (21) of described damping mechanism (2) is 0.5～5mm.
6. according to liquid gas pressure cylinder piston described in claim 1 or 5, it is characterized in that: the bumper housing (21) of described damping mechanism (2) is structure as a whole or Split type structure with piston body (1).
7. liquid gas pressure cylinder piston according to claim 1, is characterized in that: the damping mechanism (2) on described piston body (1) is three or four.
8. according to liquid gas pressure cylinder piston described in claim 1 or 7, it is characterized in that: the circumference of described piston body (1) is provided with the annular seal groove (11) of at least one filling sealed circle.
9. according to liquid gas pressure cylinder piston described in claim 1 or 7, it is characterized in that: on described piston body (1), be connected with piston rod (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410192263.7A CN103925259B (en) | 2014-05-08 | 2014-05-08 | A kind of liquid gas pressure cylinder piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410192263.7A CN103925259B (en) | 2014-05-08 | 2014-05-08 | A kind of liquid gas pressure cylinder piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103925259A true CN103925259A (en) | 2014-07-16 |
| CN103925259B CN103925259B (en) | 2016-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410192263.7A Active CN103925259B (en) | 2014-05-08 | 2014-05-08 | A kind of liquid gas pressure cylinder piston |
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| CN (1) | CN103925259B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111946587A (en) * | 2020-08-24 | 2020-11-17 | 中国石油化工集团有限公司 | Self-pressure-discharging adjustable buffer gas pressure cylinder |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240370B (en) * | 2018-02-09 | 2020-09-15 | 武汉船用机械有限责任公司 | Buffer piston |
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| DE3013381A1 (en) * | 1980-04-05 | 1981-10-08 | Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen | Power-assisted steering system ram - has cut=off valves in piston connecting pressure chambers with return connection |
| JPH08312609A (en) * | 1995-05-22 | 1996-11-26 | Toyooki Kogyo Co Ltd | Hydraulic cylinder with air vent mechanism |
| US20060137946A1 (en) * | 2004-12-28 | 2006-06-29 | Mark Stow | Telescoping cylinder |
| CN201507641U (en) * | 2009-09-23 | 2010-06-16 | 万向集团公司 | Piston of pressure groove at piston valve line |
| CN203230670U (en) * | 2013-03-04 | 2013-10-09 | 长沙理工大学 | Stroke control energy-saving cushion valve for pumping oil cylinder for concrete pump |
| CN203822756U (en) * | 2014-05-08 | 2014-09-10 | 四川工程职业技术学院 | Hydraulic pneumatic cylinder piston |
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2014
- 2014-05-08 CN CN201410192263.7A patent/CN103925259B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3013381A1 (en) * | 1980-04-05 | 1981-10-08 | Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen | Power-assisted steering system ram - has cut=off valves in piston connecting pressure chambers with return connection |
| JPH08312609A (en) * | 1995-05-22 | 1996-11-26 | Toyooki Kogyo Co Ltd | Hydraulic cylinder with air vent mechanism |
| US20060137946A1 (en) * | 2004-12-28 | 2006-06-29 | Mark Stow | Telescoping cylinder |
| CN201507641U (en) * | 2009-09-23 | 2010-06-16 | 万向集团公司 | Piston of pressure groove at piston valve line |
| CN203230670U (en) * | 2013-03-04 | 2013-10-09 | 长沙理工大学 | Stroke control energy-saving cushion valve for pumping oil cylinder for concrete pump |
| CN203822756U (en) * | 2014-05-08 | 2014-09-10 | 四川工程职业技术学院 | Hydraulic pneumatic cylinder piston |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111946587A (en) * | 2020-08-24 | 2020-11-17 | 中国石油化工集团有限公司 | Self-pressure-discharging adjustable buffer gas pressure cylinder |
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