CN103352958B - A kind of hydraulic pressure cylinder cushion - Google Patents
A kind of hydraulic pressure cylinder cushion Download PDFInfo
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- CN103352958B CN103352958B CN201310290341.2A CN201310290341A CN103352958B CN 103352958 B CN103352958 B CN 103352958B CN 201310290341 A CN201310290341 A CN 201310290341A CN 103352958 B CN103352958 B CN 103352958B
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- cushion collar
- end cap
- cylinder
- piston
- cushion
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Abstract
The invention discloses a kind of cylinder cushion device, comprise piston (1), cylinder barrel (2), cushion collar (3), pressure ring (4), screw (5), floating ring (6), piston rod (7), end cap (8), described oil hydraulic cylinder two ends are provided with end cap (8), and the length that end cap (8) stretches into cylinder body exceedes hydraulic fluid port; Piston (1) is fixed on piston rod (7), and it is inner that described piston (1) is sleeved on cylinder barrel (2); Be provided with the cushion collar (3) be sleeved on piston rod (7) in the adjacent side of piston (1), cushion collar (3) and piston rod (7) are Spielpassung; Pressure ring (4) is fixed on the interior edge face of end cap (8) by screw (5); Floating ring (6) is arranged between pressure ring (4) and end cap (8), with cushion collar (3) Spielpassung.The present invention can improve cushioning effect, reduces the difficulty of processing of damping device and cuts down finished cost.
Description
Technical field
The invention belongs to the buffer technology field of oil hydraulic cylinder, relate to a kind of hydraulic pressure cylinder cushion.
Background technique
When the oil hydraulic cylinder of high-speed motion arrives end, very large impact can be produced; In order to reduce impact, increase hydraulic damping device in cylinder ends; Existing cylinder cushion device kind is a lot, but its essence is all increase by one section of fitting surface before and after piston, oil back chamber is divided into buffer cavity and oil back chamber two-part, the fluid of buffer cavity flows to oil back chamber by restriction, back pressure is produced thus at buffer cavity, stop the motion of piston, reduce piston movement speed, thus play the object slowing down impact; Whether change according to choke area, be divided into fixed restriction and variable restrictor two kinds of buffer type; In buffering at first, the buffer-braking power of generation is very large, but compensator or trimmer pressure is decayed very soon, and what effect rear end plays hardly, and cushioning effect is very poor for fixed restriction; Variable throttling damping device is that flow area changes with the change of cushion stroke in buffering course, and conical surface is relatively milder in the pressure change at buffering initial stage, but the pressure jump in later stage is very large; Parabola can reach comparatively ideal cushioning effect, but processing needs numerical control machine tool, and cost is high, and there is the sudden change of pressure when buffering starts and terminates.
Existing damping device is in order to reach good cushioning effect, the concentric of damping device and cylinder barrel or end cap must be ensured, this just needs to ensure the quality of fit of the quality of fit of the quality of fit of the quality of fit of the quality of fit of the quality of fit of end cap and piston rod, cylinder barrel and end cap, cylinder barrel and piston, piston and piston rod, cushion collar and piston rod, cushion collar and end cap in course of working, add the difficulty of processing on the one hand, on the other hand because the accumulation of error has uncontrollability, cause the cushioning effect of two of same machining accuracy oil cylinders inconsistent thus.
Summary of the invention
The object of the invention is to overcome the defect existed in prior art, a kind of hydraulic pressure cylinder cushion is provided, adopt porous cushion collar type, by axially suitably arranging the aperture of different-diameter, varying number at cushion collar, make orifice size closer to desirable buffer curve, compensator or trimmer pressure is substantially close to ideal curve, thus make buffering course more reasonable, the buffering course of oil hydraulic cylinder will be more steady, both firmly not impact, and also not have soft impact; The mode that the present invention adopts floating ring to coordinate with cushion collar, the machining accuracy improving floating ring and cushion collar is only needed in course of working, reach good Spielpassung, like this, when piston movement is to end of travel, very successfully floating ring and cushion collar can be combined together by the conical surface of cushion collar front end, play seal action by floating ring end face with coordinating of end cap, oil back chamber is divided into buffer cavity and oil back chamber two-part; Greatly can reduce difficulty of processing like this, ensure that the cushioning effect of the damping device of same accuracy is completely the same.
Its concrete technological scheme is: a kind of cylinder cushion device, comprises piston, cylinder barrel, cushion collar, pressure ring, screw, floating ring, piston rod, end cap, and described oil hydraulic cylinder two ends are provided with end cap, and the length that end cap stretches into cylinder body exceedes hydraulic fluid port; Piston is fixing on the piston rod, and described piston sleeve is contained in cylinder barrel inside; Be provided with suit cushion collar on the piston rod in the adjacent side of piston, cushion collar and piston rod are Spielpassung; Pressure ring is fixed by screws on the interior edge face of end cap; Floating ring is arranged between pressure ring and end cap, with cushion collar Spielpassung.
Further preferably, on described cushion collar open throttle orifice size and quantity number, ensure that its flow area is similar to the orifice size needed for desirable isenthalp vertically.
Further preferably, the end face of described cushion collar is conical surface, and the tapering of conical surface is less than 15 °, and conical surface is provided with half round cut, is provided with the anisodiametric throttle orifice of Unequal distance unequal number amount in axial external surface.
Further preferably, described cushion collar is greater than the diameter of the two ends internal surface of cushion collar near the diameter of the internal surface in neutral position, and the internal surface of cushion collar and the outer surface of piston rod form annular oil cavity.
Further preferably, the annular oil cavity that throttling passage comprises buffer cavity that throttle orifice, cushion collar outer surface and cylinder barrel on described cushion collar formed, oil back chamber, cushion collar internal surface and piston rod between piston rod and end cap is formed, the half round cut of center, cushion collar end, the flying height chamber between pressure ring and floating ring.
Further preferably, the half round cut on described cushion collar conical surface communicates with oil back chamber with annular oil cavity, buffer cavity.
Further preferably, described floating ring outer surface diameter is less than the inner surface diameter of pressure ring, the cushion collar Spielpassung of described floating ring and motion, leave radial floating gap between floating ring and pressure ring, be converted into the axial seal between floating ring and end cap by the radial fit of floating ring and cushion collar.
Further preferably, described floating ring is provided with through hole.
Further preferably, the effective active area of described buffer cavity inner fluid approximates the effective active area of oil back chamber inner fluid.
Compared with prior art, beneficial effect of the present invention is:
The present invention adopts porous cushion collar type, by suitably arranging the quantity of the throttle orifice on cushion collar, size and the regularity of distribution, make orifice size closer to ideal curve, compensator or trimmer pressure is substantially close to ideal curve, avoid hard impact, reduce soft impact, thus the end of slowing down oil hydraulic cylinder is impacted, and improves cushioning effect; Simultaneously, the present invention does not need to ensure concentric between cushion collar with end cap and improving end cap and piston rod, cylinder barrel and end cap, cylinder barrel and piston, piston and piston rod, cushion collar and piston rod, quality of fit between cushion collar and end cap, only need improve the processing quality of fit of cushion collar outer surface and floating ring internal surface, and the processing quality of fit between floating ring end face and end cap interior edge face, and then the difficulty of processing of damping device can be reduced and cut down finished cost.
Accompanying drawing explanation
Fig. 1 is cylinder cushion device structural drawing of the present invention;
Fig. 2 is the situation that damping device is applied to rod chamber;
Fig. 3 is the situation that damping device is applied to rodless cavity;
Fig. 4 is cushion collar structural drawing;
Fig. 5 is floating ring structural drawing;
Floating ring status figure when Fig. 6 is oppositely quick startup;
Fig. 7 is one suite line chart when throttle hole area changes vertically on cushion collar;
Fig. 8 is the one distribution of aperture on cushion collar when adopting equal diameter.
Embodiment
What below in conjunction with accompanying drawing specific embodiment, technological scheme of the present invention is described in more detail.
A kind of cylinder cushion device, comprise piston 1, cylinder barrel 2, cushion collar 3, pressure ring 4, screw 5, floating ring 6, piston rod 7, end cap 8, described oil hydraulic cylinder two ends are provided with end cap 8, and the length that end cap 8 stretches into cylinder body exceedes hydraulic fluid port, have cooperation requirement to interior edge face; Piston 1 is fixed on piston rod 7, and it is inner that described piston 1 is sleeved on cylinder barrel 2; Be provided with the cushion collar 3 be sleeved on piston rod 7 in the adjacent side of piston 1, cushion collar 3 and piston rod 7 are Spielpassung, and cushion collar 3 can along piston rod 7 axial float; Pressure ring 4 is fixed on the interior edge face of end cap 8 by screw 5; Floating ring 6 is arranged between pressure ring 4 and end cap 8, and with cushion collar 3 Spielpassung, floating ring 6 can carry out axis and radial floating.The end face of described cushion collar 3 is conical surfaces 14, and the tapering of conical surface 14 is less than 15 °, and conical surface 14 is provided with half round cut 12, is provided with the anisodiametric throttle orifice of Unequal distance unequal number amount, makes orifice size more close to ideal curve in axial external surface.Described cushion collar 3 is greater than the diameter of the two ends internal surface of cushion collar 3 near the diameter of the internal surface in neutral position, and the internal surface of cushion collar 3 and the outer surface of piston rod 7 form annular oil cavity 11.The annular oil cavity 11 that throttling passage comprises buffer cavity 9 that described cushion collar 3 outer surface and cylinder barrel 2 formed, oil back chamber 10, cushion collar 3 internal surface and piston rod 7 between piston rod 7 and end cap 8 is formed, the half round cut 12 of center, cushion collar 3 end, the flying height chamber 13 between pressure ring 4 and floating ring 6.Half round cut 12 on described cushion collar 3 conical surface 14 communicates with oil back chamber 10 with annular oil cavity 11, buffer cavity 9.Described floating ring 6 outer surface diameter is less than the inner surface diameter of pressure ring 4, floating ring 6 can carry out the movement of some axial directions, described floating ring 6 and cushion collar 3 Spielpassung of moving, leave radial floating gap between floating ring 6 and pressure ring 4, be converted into the axial seal between floating ring 6 and end cap 8 by the radial fit of floating ring 6 and motion cushion collar 3.Described floating ring 6 is provided with through hole.It is inner that damping device can be assemblied in different oil hydraulic cylinders, realizes the modular design of buffer structure.The effective active area of described buffer cavity 9 inner fluid approximates the effective active area of oil back chamber 10 inner fluid.
Described damping device can be arranged on rod chamber, also can be arranged on rodless cavity, also can rod chamber and rodless cavity install simultaneously.
When piston 1 moves right, due to the quality that load is huge, producing great inertial force, for eliminating the mechanical collision between piston 1 because inertial force and the hydraulic coupling of piston causes and end cap 8, devising a kind of cylinder cushion device; When piston 1 moves to end of travel, floating ring 6 fits tightly end cap interior edge face, the conical surface 14 of cushion collar 3 leading portion makes it successfully import in the hole of floating ring 6, and floating ring 6 revises the malalignment between the hole of cushion collar 3 and floating ring 6 by the radial clearance between pressure ring 4; The fluid sealed up for safekeeping in buffer cavity flows into oil back chamber 10 by the throttle orifice 15 on cushion collar 3, due to the damping function of throttle orifice 15, the fluid in oil back chamber is produced and the braking force of resisting mutually in piston running, reaches the object of deceleration; When piston needs reverse starting, floating ring 6 fits tightly pressure ring 4, and hydraulic oil is by the flying height 13 between floating ring 6 and pressure ring 4, and the hole 16 on floating ring 6 and the common oil-feed of half round cut on cushion collar 3, realize oppositely starting fast of piston.
Embodiment 1
As Fig. 2 damping device is applied to the situation of rod chamber, when piston 1 enters buffer stage, floating ring 6 fits tightly the interior edge face at end cap 8, the fluid of buffer cavity 9, by the throttle orifice 15 on cushion collar 3, by the annular oil cavity 11 between cushion collar 3 and piston rod 7, enters oil back chamber 10 by the half round cut 12 on cushion collar 3, producing certain pressure at buffer cavity 9 acts on effective cushion area, stop the motion of piston, thus play the speed slowing down piston, slow down the object of impact.
Embodiment 2
As Fig. 3 damping device is applied to the situation of rodless cavity, the other the same as in Example 1.
Embodiment 3
Oppositely start fast, when the fluid in oil back chamber 10 acts on the right side of floating ring 6, floating ring 6 is to left movement, fit tightly with the right side of pressure ring 4, hydraulic oil is by the flying height 13 between floating ring and pressure ring, oil through 16 on floating ring 6 and the common oil-feed of half round cut on cushion collar 3, when larger flow area makes piston start, back pressure is lower, and piston can start fast.
Embodiment 4
Reverse slow start, when pressure ring processing very thin time, axial float gap between pressure ring and floating ring is very little, so hydraulic oil can only enter the annular pass 11 between cushion collar 3 and piston rod 7 by the half round cut 12 on cushion collar, by the throttle orifice 15 on cushion collar 3, then flow into buffer cavity 9.So different toggle speeds can be reached by the number of the oil through 16 on adjustment flying height and floating ring 6.The other the same as in Example 3.
Embodiment 5
In actual production, the curve obtaining desirable orifice size and change with stroke can be analyzed according to the requirement of concrete operating mode, utilize throttle orifice to go simulate ideal orifice size, Fig. 8 gives a kind of distribution map often arranging the quantity of aperture and the spacing of each row's aperture when orifice diameter is 1mm; In addition, when working condition changes, carry out simulate ideal orifice size by change orifice diameter, the distance of often arranging between the quantity of aperture and each row's aperture, reach shock-free cushioning effect.
The above; be only the present invention's preferably embodiment; protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses, the simple change of the technological scheme that can obtain apparently or equivalence are replaced and are all fallen within the scope of protection of the present invention.
Claims (7)
1. a cylinder cushion device, it is characterized in that, comprise piston (1), cylinder barrel (2), cushion collar (3), pressure ring (4), screw (5), floating ring (6), piston rod (7), end cap (8), described oil hydraulic cylinder two ends are provided with end cap (8), and the length that end cap (8) stretches into cylinder body exceedes hydraulic fluid port; Piston (1) is fixed on piston rod (7), and it is inner that described piston (1) is sleeved on cylinder barrel (2); Be provided with the cushion collar (3) be sleeved on piston rod (7) in the adjacent side of piston (1), cushion collar (3) and piston rod (7) are Spielpassung; Pressure ring (4) is fixed on the interior edge face of end cap (8) by screw (5); Floating ring (6) is arranged between pressure ring (4) and end cap (8), with cushion collar (3) Spielpassung; The end face of described cushion collar (3) is conical surface (14), the tapering of conical surface (14) is less than 15 °, conical surface (14) is provided with half round cut (12), is provided with the anisodiametric throttle orifice of Unequal distance unequal number amount (15) in axial external surface.
2. cylinder cushion device according to claim 1, it is characterized in that, the diameter of the internal surface in the close neutral position of described cushion collar (3) is greater than the diameter of the two ends internal surface of cushion collar (3), and the internal surface of cushion collar (3) and the outer surface of piston rod (7) form annular oil cavity (11).
3. cylinder cushion device according to claim 1, it is characterized in that, throttling passage comprises buffer cavity (9) that the throttle orifice (15) on cushion collar, described cushion collar (3) outer surface and cylinder barrel (2) formed, annular oil cavity (11) that oil back chamber (10), cushion collar (3) internal surface and piston rod (7) between piston rod (7) and end cap (8) is formed, the half round cut (12) of cushion collar (3) center, end, the flying height chamber (13) between pressure ring (4) and floating ring (6).
4. cylinder cushion device according to claim 3, it is characterized in that, the half round cut (12) on described cushion collar (3) conical surface (14) communicates with oil back chamber (10) with annular oil cavity (11), buffer cavity (9).
5. cylinder cushion device according to claim 1, it is characterized in that, described floating ring (6) outer surface diameter is greater than the inner surface diameter of pressure ring (4) and end cap (8), described floating ring (6) and cushion collar (3) Spielpassung of moving, leave radial floating gap between floating ring (6) and pressure ring (4), be converted into the axial seal between floating ring (6) and end cap (8) by the radial fit of floating ring (6) and motion cushion collar (3).
6. cylinder cushion device according to claim 1, is characterized in that, described floating ring (6) is provided with through hole.
7. cylinder cushion device according to claim 3, is characterized in that, the effective active area of described buffer cavity (9) inner fluid equals the effective active area of oil back chamber (10) inner fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310290341.2A CN103352958B (en) | 2013-07-02 | 2013-07-02 | A kind of hydraulic pressure cylinder cushion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310290341.2A CN103352958B (en) | 2013-07-02 | 2013-07-02 | A kind of hydraulic pressure cylinder cushion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103352958A CN103352958A (en) | 2013-10-16 |
| CN103352958B true CN103352958B (en) | 2016-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310290341.2A Expired - Fee Related CN103352958B (en) | 2013-07-02 | 2013-07-02 | A kind of hydraulic pressure cylinder cushion |
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| Country | Link |
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| CN (1) | CN103352958B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104033527A (en) * | 2014-07-02 | 2014-09-10 | 谭晓婧 | Gasbag-free single-rod magneto-rheological damper |
| CN109990034B (en) * | 2017-12-29 | 2024-04-02 | 邱燕端 | Three-section controllable gas spring |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0127885A2 (en) * | 1983-05-30 | 1984-12-12 | Stopanski Kombinat Sa Teshko Mashinostroene | Hydraulic impact mechanism |
| US6006873A (en) * | 1996-08-23 | 1999-12-28 | Ace Stobdampfer Gmbh | Industrial shock absorber |
| 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 |
| CN201284769Y (en) * | 2008-10-17 | 2009-08-05 | 云南兴长江实业有限公司 | Floating buffering mechanism of hydraulic cylinder |
| CN201475229U (en) * | 2009-07-20 | 2010-05-19 | 乐清市乐泰重型机械配件有限公司 | Mine vehicle oil-gas front suspension cylinder assembly |
| CN201636127U (en) * | 2010-04-01 | 2010-11-17 | 天津市天机液压机械有限公司 | Buffering structure of hydraulic cylinder |
| CN201636128U (en) * | 2010-04-01 | 2010-11-17 | 天津市天机液压机械有限公司 | Throttling buffer for hydraulic system |
-
2013
- 2013-07-02 CN CN201310290341.2A patent/CN103352958B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0127885A2 (en) * | 1983-05-30 | 1984-12-12 | Stopanski Kombinat Sa Teshko Mashinostroene | Hydraulic impact mechanism |
| US6006873A (en) * | 1996-08-23 | 1999-12-28 | Ace Stobdampfer Gmbh | Industrial shock absorber |
| 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 |
| CN201284769Y (en) * | 2008-10-17 | 2009-08-05 | 云南兴长江实业有限公司 | Floating buffering mechanism of hydraulic cylinder |
| CN201475229U (en) * | 2009-07-20 | 2010-05-19 | 乐清市乐泰重型机械配件有限公司 | Mine vehicle oil-gas front suspension cylinder assembly |
| CN201636127U (en) * | 2010-04-01 | 2010-11-17 | 天津市天机液压机械有限公司 | Buffering structure of hydraulic cylinder |
| CN201636128U (en) * | 2010-04-01 | 2010-11-17 | 天津市天机液压机械有限公司 | Throttling buffer for hydraulic system |
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| CN103352958A (en) | 2013-10-16 |
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