CN103925259B - A kind of liquid gas pressure cylinder piston - Google Patents
A kind of liquid gas pressure cylinder piston Download PDFInfo
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- CN103925259B CN103925259B CN201410192263.7A CN201410192263A CN103925259B CN 103925259 B CN103925259 B CN 103925259B CN 201410192263 A CN201410192263 A CN 201410192263A CN 103925259 B CN103925259 B CN 103925259B
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Abstract
The invention discloses a kind of liquid gas pressure cylinder piston, comprise the piston body which is provided with at least one damping mechanism, this damping mechanism is primarily of the bumper housing be arranged in piston body, pressure-relief valve and first, second screw plug is formed, bumper housing is provided with pressure relief vent, and on a left side for bumper housing, right side is respectively equipped with the pod apertures passing to pressure relief vent inside, two pod apertures in pressure relief vent are corresponding, the middle part of pressure-relief valve is circumferentially provided with the pressure relief groove of annular, be assemblied in pressure relief vent, pod apertures diameter in the corresponding pressure relief vent of pressure relief groove width, first, second screw plug is respectively equipped with tracting pressuring hole, first, second screw plug is assemblied in the two ends of pressure relief vent, pod apertures in pressure relief vent and pressure-relief valve are in first, between second screw plug, first, pressure relief vent between second screw plug forms the past complex space of pressure-relief valve, pressure-relief valve when being in stroke end in complex space, pressure relief groove is by shutoff.Under load condition, slowing down when it arrives stroke end is zero, reliable operation.
Description
Technical field
The present invention relates to the piston moved back and forth in oil hydraulic cylinder or cylinder.
Background technique
Oil hydraulic cylinder or cylinder are operationally, piston in its cylinder body is under the effect of acting medium (hydraulic oil or pressurized air), motion speed is higher, thus the inertial force comparatively large (this is especially remarkable with large quality piston) that piston runs, 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 on cylinder body or cylinder bottom).Thus, for oil hydraulic cylinder or cylinder engine buffer structure are absolutely necessary.
At present, the buffer structure of oil hydraulic cylinder or cylinder mainly contains two kinds of set-up modes.A kind of is be arranged on the control loop of cylinder body outside, its exist complex structure, volume large, make trouble, the defect such as manufacture cost is high.Another kind is arranged on the piston of cylinder interior, this setup or be the buffering utilizing the acting medium in cylinder body directly to carry out piston operation, disclosed " a kind of buffering hydraulic oil cylinder " (publication number: CN203161708 of such as Chinese patent literature, publication date: on August 28th, 2013), " buffering hydraulic oil cylinder " (publication number: CN203374549, publication date: on January 1st, 2014); The buffering utilizing elastic member to carry out piston operation, disclosed " two-way automatic buffer hydraulic jack " (publication number: CN202768523, the publication date: on March 6th, 2013) of such as Chinese patent literature; Although they compare have that structure is simple, volume is little, the advantage of easily manufactured, low cost of manufacture, but there is the problem of practicability and poor reliability, this is because: utilize the acting medium in cylinder body directly to carry out the buffering of piston operation, just must guarantee reserved a certain amount of acting medium in cylinder body, acting medium reservation too much effectively can improve cushioning effect, otherwise then can affect cushioning effect, thus increase the design difficulty of this oil hydraulic cylinder or cylinder control loop, poor operability, practical not; Elastic member is utilized to carry out the buffering of piston operation, though the direct mechanical of the cylinder bottom or end cap that avoid piston and cylinder body is collided, but elastic member all the time in the reciprocatory movement of piston with the cylinder bottom of cylinder body or end cap contact-impact repeatedly, this contact-impact is unlikely to damage cylinder body in a short time, but the impact shock caused 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, the liquid gas pressure cylinder piston that a kind of structure is simple, easily manufactured, low cost of manufacture, good operability, good buffer effect, reliability are high, practical is provided.
The technical solution used in the present invention is: a kind of liquid gas pressure cylinder piston, and comprise piston body, described piston body is provided with the damping mechanism of at least one release, described damping mechanism is primarily of the bumper housing be arranged in piston body, pressure-relief valve, first screw plug and the second screw plug are formed, described bumper housing is provided with the pressure relief vent of axial hole shape, and the first pod apertures passing to pressure relief vent inside is provided with in the left side of bumper housing, right side is provided with the second pod apertures passing to pressure relief vent inside, the first pod apertures in pressure relief vent is corresponding with the second pod apertures, the middle part of described pressure-relief valve is circumferentially provided with the pressure relief groove of annular, 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, described first screw plug and the second screw plug are respectively equipped with the tracting pressuring hole of axial hole shape, 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 first screw plug and the second screw plug forms the past complex space of pressure-relief valve, pressure-relief valve when being in stroke end in complex space, 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, the pressure-relief valve two ends of described damping mechanism are circumferentially filled with seal ring respectively.
Further, the pod apertures diameter on the bumper housing of described damping mechanism is 0.5 ~ 5mm.
Further, described damping mechanism bumper housing and piston body is structure as a whole or Split type structure.
Further, the damping mechanism on described piston body is three or four.
Further, the annular seal groove being circumferentially provided with at least one filling sealed circle of described piston body.
Further, described piston body is connected with piston rod.
The invention has the beneficial effects as follows: by arranging the damping mechanism of release on the piston body, make this piston applications when oil hydraulic cylinder or cylinder, walk to stroke end place and namely produce release buffering, now hyperbaric chamber (the pressurising side of the piston) internal pressure of cylinder body declines, low-pressure cavity (the row pressure side of piston) internal pressure increases, thus the pressure in low-pressure cavity is kept out, eliminate the inertial force of piston, until slowing down when making the piston arrives stroke end with load is zero, stop the cylinder bottom of piston to cylinder body or the impact of end cap, the working life of whole oil hydraulic cylinder or cylinder is effectively extended, reliable operation.In contrast the present invention, has the features such as structure is simple, easily manufactured, low cost of manufacture, good operability, good buffer effect, reliability are high and practical.
Accompanying drawing explanation
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; 25-the first pod apertures; 26-the first screw plug; 27-the second pod apertures; 28-the second screw plug; 29-elastomer; 210-the first tracting pressuring hole; 211-the second tracting pressuring hole.
Embodiment
The present invention is applied to oil hydraulic cylinder or cylinder, in oil hydraulic cylinder or cylinder according to acting medium the entering of (hydraulic oil or pressurized air), discharge the acting that moves back and forth.Now describe the present invention for oil hydraulic cylinder in detail in conjunction with following embodiment.
embodiment 1
See Fig. 1, Fig. 2 and Fig. 3: the present invention includes piston body 1 and the damping mechanism 2 being arranged in 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.At the annular seal groove 11 being circumferentially provided with the four filling sealed circles in road of piston body 1, the quantity of sealing groove 11 is rationally determined according to the performance of oil hydraulic cylinder equally, such as twice, three roads etc., be mainly used for preventing oil hydraulic cylinder in the course of the work hydraulic oil arbitrarily leak from hyperbaric chamber (i.e. the pressurising side of piston) to low-pressure cavity (i.e. the row pressure side of piston).Aforementioned piston body 1 is connected with piston rod 12, and this piston rod 12 assembles from the cylinder bottom sealing of oil hydraulic cylinder and extends.
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 determine according to the performance height of oil hydraulic cylinder, the damping mechanism more than 2 that piston body 1 is arranged, when piston walks to stroke end, release cushioning effect is better, preferably, piston body 1 arranges three or four and just can fully realize goal of the invention of the present invention, if only arrange the damping mechanism 2 of a release on piston body 1, though goal of the invention of the present invention can be realized to the oil hydraulic cylinder of low performance, but run balance to keep piston, require that this damping mechanism 2 is in the center of piston body 1, now in order to conducting acting medium, certainly will require that piston rod 12 being offered conduction hole 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 formed primarily of the bumper housing 21 be arranged in piston body 1, pressure-relief valve 23, first screw plug 26 and the second screw plug 28.
Above-mentioned bumper housing 21 is Split type structure with piston body 1.The outer wall profile of bumper housing 21 is the column structure (setting of ledge structure mainly for the ease of arranging assembling on piston body 1) of step, and the height of bumper housing 21 is equal with the thickness of piston body 1.The two ends of the pressure relief vent 22(and pressure relief vent 22 that are provided with axial hole shape at the center of bumper housing 21 communicate with two end faces of bumper housing 21 respectively), two end hole wall sections of pressure relief vent 22 are provided with connecting thread; And be provided with in the left side of bumper housing 21 pass to the first pod apertures 25 in the middle part of pressure relief vent 22, right side is provided with the second pod apertures 27 passed in the middle part of pressure relief vent 22, first pod apertures 25 and the second pod apertures 27 are distinguished L-shaped, 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 first pod apertures 25 and the second pod apertures 27 is respectively 0.5 ~ 5mm, such as 0.8mm, or 1.9mm, or 3.2mm, and also or 4.7mm etc., the selection of occurrence needs to determine according to the performance height of oil hydraulic cylinder.When damping mechanism 2 arranges assembling on piston body 1, piston body 1 is preset with the through hole of the bumper housing 21 outer wall profile of coupling damping mechanism 2, left side and the right side of this through hole and piston body 1 communicate respectively, aforementioned bumper housing 21 is corresponding, sealing is 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 pressure-relief valve 23 is corresponding, the diameter of coupling pressure relief vent 22.At pressure-relief valve 23 two ends, end face is respectively equipped with elastomer 29(such as rubber elastic material or metal clips etc.), conveniently elastomer 29 fixing at pressure-relief valve 23 end face, groove is offered at the end face of pressure-relief valve 23, elastomer 29 is inlaid in the facing groove of pressure-relief valve 23, effectively can improve pressure-relief valve 23 reciprocal reliability in the course of the work by arranging of elastomer 29.The pressure relief groove 24 of annular is circumferentially provided with at the middle part of pressure-relief valve 23, the width of this pressure relief groove 24 answers pod apertures (i.e. the first pod apertures 25 and the second pod apertures 27) diameter in corresponding pressure relief vent 22, namely the width range value of pressure relief groove 24 is 0.5 ~ 5mm, such as 0.8mm, or 1.9mm, or 3.2mm, also or 4.7mm etc.; Circumferentially be filled with seal ring with mode of grooving respectively at the pressure-relief valve 23 of pressure relief groove 24 both sides, the seal ring namely on pressure-relief valve 23 is in the end, two ends of pressure-relief valve circumferentially substantially.Pressure-relief valve 23 is assemblied in pressure relief vent 22, is assemblied in pressure-relief valve 23 in pressure relief vent 22 and is contacted with the hole wall of pressure relief vent 22 by seal ring and seal.
Above-mentioned 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 matches with pressure relief vent 22 diameter on bumper housing 21 respectively, and at the connecting thread being circumferentially respectively equipped with screw thread on corresponding pressure relief vent 22 of the first screw plug 26 and the second screw plug 28.First screw plug 26 and the second screw plug 28 are respectively equipped with the tracting pressuring hole of axial hole shape, namely on the first screw plug 26 is that the first tracting pressuring hole 210, second screw plug 28 is the second tracting pressuring hole 211.First screw plug 26 and the second screw plug 28 are assemblied in the two ends of pressure relief vent 22 threadably, make the pod apertures in pressure relief vent 22 (i.e. the first pod apertures 25 and the second pod apertures 27) and pressure-relief valve 23 be between the first screw plug 26 and the second screw plug 28, 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 to effectively improve pressure-relief valve 23 reciprocal reliability in the course of the work, 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 when being in stroke end in complex space, namely when the end face of pressure-relief valve 23 contacts with the first screw plug 26 or the second screw plug 28 and attaches, 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 chamber on the left of setting piston is the hyperbaric chamber of pressurising, the chamber on right side is the low-pressure cavity of row pressure, and piston runs 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 lateral, right side and the second screw plug 28 are attached, pressure relief groove 24 now on pressure-relief valve 23 pod apertures (i.e. the first pod apertures 25 and the second pod apertures 27) be relaxed in hole 22 hole wall shutoff, pressure relief vent 22 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, when piston walks to stroke end, namely when end cap or the cylinder bottom of cylinder body, hydraulic oil remaining in low-pressure cavity by the second tracting pressuring hole 211 momentary action on the second screw plug 28 in the right side of pressure-relief valve 23, pressure-relief valve 23 is forced to run left instantaneously, this elastomer 29 operated on right side is more reliable under assisting, just in this process run instantaneously, pressure relief groove 24 on pressure-relief valve 23 corresponds to the first pod apertures 25 and the second pod apertures 27 place, the first pod apertures 25 and the second pod apertures 27 conducting on bumper housing 21, a little hydraulic oil in hyperbaric chamber drains into low-pressure cavity instantaneously under High Pressure, in addition pressure-relief valve 23 is at height, under the effect of low-pressure cavity pressure and natural resiliency, repeatedly move back and forth, this process makes the remarkable step-down of hyperbaric chamber, the remarkable supercharging of low-pressure cavity, the pressure increased in low-pressure cavity is kept out, eliminate the inertial force of piston, until slowing down when making the piston arrives stroke end with load is zero, chamber on the right side of setting piston is the hyperbaric chamber of pressurising, the chamber in left side is the low-pressure cavity of row pressure, and piston runs from right to left under the effect of hydraulic oil, and it runs, buffering course and above-mentioned from left to right contrary, does 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, namely piston body self also serves as bumper housing, the pressure relief vent of axial hole shape is offered in the precalculated position (namely assembling the position of damping mechanism in embodiment 1) of piston body, two end hole wall sections of this pressure relief vent are provided with connecting thread, and the piston body left side near this pressure relief vent be provided with pass to the first pod apertures in the middle part of pressure relief vent, right side is provided with the second pod apertures passed in the middle part of pressure relief vent.This pressure relief vent that originally arranges with it at piston body and pod apertures (i.e. the first pod apertures and the second pod apertures) make piston body itself define bumper housing, and the two combines together.
In contrast the present embodiment, simplifies modular construction and quantity to a certain extent, but, because pod apertures is the small aperture of several millimeters, thus the operation easier of irregular pod apertures piston body being offered this " L shape " is increased to a certain extent.
Claims (9)
1. oil hydraulic cylinder/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 primarily of the bumper housing (21) be arranged in piston body (1), pressure-relief valve (23), first screw plug (26) and the second screw plug (28) are formed, described bumper housing (21) is provided with the pressure relief vent (22) of axial hole shape, and the first pod apertures (25) passing to pressure relief vent (22) inside is provided with in the left side of bumper housing (21), right side is provided with and passes to inner the second pod apertures (27) of pressure relief vent (22), the first pod apertures (25) in pressure relief vent (22) and the second pod apertures (27) corresponding, the middle part of described pressure-relief valve (23) is circumferentially provided with the pressure relief groove (24) of annular, pressure-relief valve (23) is assemblied in pressure relief vent (22), pod apertures diameter in the corresponding pressure relief vent (22) of pressure relief groove (24) width on pressure-relief valve (23), described first screw plug (26) and the second screw plug (28) are respectively equipped with the tracting pressuring hole of axial hole shape, first screw plug (26) and the second screw plug (28) are assemblied in the two ends of pressure relief vent (22), pod apertures in pressure relief vent (22) and pressure-relief valve (23) are between the first screw plug (26) and the second screw plug (28), pressure relief vent (22) between first screw plug (26) and the second screw plug (28) forms the past complex space of pressure-relief valve (23), pressure-relief valve (23) when being in stroke end in complex space, pressure relief groove (24) on pressure-relief valve (23) is relaxed hole (22) shutoff.
2. oil hydraulic cylinder/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. oil hydraulic cylinder/cylinder piston according to claim 1 or 2, 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. oil hydraulic cylinder/cylinder piston according to claim 1 or 2, is characterized in that: pressure-relief valve (23) two ends of described damping mechanism (2) are circumferentially filled with seal ring respectively.
5. oil hydraulic cylinder/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. oil hydraulic cylinder/cylinder piston according to claim 1 or 5, is characterized in that: bumper housing (21) and the piston body (1) of described damping mechanism (2) are structure as a whole or Split type structure.
7. oil hydraulic cylinder/cylinder piston according to claim 1, is characterized in that: the damping mechanism (2) on described piston body (1) is three or four.
8. oil hydraulic cylinder/cylinder piston according to claim 1 or 7, is characterized in that: the annular seal groove (11) being circumferentially provided with at least one filling sealed circle of described piston body (1).
9. oil hydraulic cylinder/cylinder piston according to claim 1 or 7, is characterized in that: described piston body (1) is 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 |
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| Publication Number | Publication Date |
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| CN103925259A CN103925259A (en) | 2014-07-16 |
| CN103925259B true 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240370A (en) * | 2018-02-09 | 2018-07-03 | 武汉船用机械有限责任公司 | Damper piston |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111946587B (en) * | 2020-08-24 | 2022-04-22 | 中国石油化工集团有限公司 | Self-pressure-discharging adjustable buffer gas pressure cylinder |
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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 |
| 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08312609A (en) * | 1995-05-22 | 1996-11-26 | Toyooki Kogyo Co Ltd | Hydraulic cylinder with air vent mechanism |
| US7337885B2 (en) * | 2004-12-28 | 2008-03-04 | Smc Corporation Of America | Telescoping cylinder |
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2014
- 2014-05-08 CN CN201410192263.7A patent/CN103925259B/en active Active
Patent Citations (4)
| 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 |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240370A (en) * | 2018-02-09 | 2018-07-03 | 武汉船用机械有限责任公司 | Damper piston |
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| CN103925259A (en) | 2014-07-16 |
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