CN103352958A - Buffer device of hydraulic cylinder - Google Patents
Buffer device of hydraulic cylinder Download PDFInfo
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- CN103352958A CN103352958A CN 201310290341 CN201310290341A CN103352958A CN 103352958 A CN103352958 A CN 103352958A CN 201310290341 CN201310290341 CN 201310290341 CN 201310290341 A CN201310290341 A CN 201310290341A CN 103352958 A CN103352958 A CN 103352958A
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- cushion collar
- cylinder
- piston
- cushion
- piston rod
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Abstract
The invention discloses a buffer device of a hydraulic cylinder. The buffer device of the hydraulic cylinder comprises a piston (1), a cylinder barrel (2), a cushion collar (3), compression rings (4), screws (5), floating rings (6), a piston rod (7) and end covers (8). The end covers (8) are arranged at the two ends of the hydraulic cylinder, and the length of the portion, extending into a cylinder body, of each end cover exceeds a hydraulic fluid port. The piston (1) is fixed on the piston rod (7) and is sleeved in the cylinder barrel (2). The cushion collar (3) sleeved on the piston rod (7) is arranged on an adjacent side of the piston (1) and is in clearance fit with the piston rod (7). The compression rings (4) are fixed on inner end faces of the end covers (8) through the screws (5). The floating rings (6) are arranged between the compression rings (4) and the end covers (8) and are in clearance fit with the cushion collar (3). The buffer device of the hydraulic cylinder can improve buffer effect, and reduce machining difficulty and machining 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 the end, can produce very large impact; In order to reduce impact, increase hydraulic damping device in cylinder ends; Existing cylinder cushion device kind is a lot, but its essence all is to increase by one section 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, produce back pressure at buffer cavity thus, stop the motion of piston, reduce piston movement speed, thereby play the purpose of slowing down impact; Whether change according to choke area, be divided into two kinds of buffer type of fixed restriction and variable restrictor; Fixed restriction in buffering at first, the buffer-braking power of generation is very large, but compensator or trimmer pressure decay very soon, what the rear end played hardly and acted on, cushioning effect is very poor; The variable throttling damping device is that flow area changes with the variation of cushion stroke in buffering course, and conical surface changes milder at the pressure 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 has the sudden change of pressure in buffering beginning and end.
Existing damping device is in order to reach preferably cushioning effect, necessary assurance damping device is concentric with cylinder barrel or end cap, this just need to guarantee the quality of fit of quality of fit, cushion collar and end cap of quality of fit, cushion collar and piston rod of quality of fit, piston and piston rod of quality of fit, cylinder barrel and piston of quality of fit, cylinder barrel and the end cap of end cap and piston rod in course of working, increased on the one hand the difficulty of processing, on the other hand because the accumulation of error has uncontrollability, cause thus the cushioning effect of two oil cylinders of same machining accuracy inconsistent.
Summary of the invention
The object of the invention is to overcome the defective that exists in the prior art, a kind of hydraulic pressure cylinder cushion is provided, adopt porous cushion collar type, by axially suitably arrange the aperture of different-diameter, varying number at cushion collar, make orifice size closer to desirable buffer curve, compensator or trimmer pressure is substantially near ideal curve, thereby make buffering course more reasonable, the buffering course of oil hydraulic cylinder will be more steady, and both not hard impact did not have soft impact yet; The mode that the present invention adopts floating ring to cooperate with cushion collar, in course of working, only need to improve the machining accuracy of floating ring and cushion collar, reaching good Spielpassung gets final product, like this, when piston movement during to end of travel, conical surface by the cushion collar front end can very successfully be combined together floating ring and cushion collar, by floating ring end face and cooperating of end cap playing seal action, oil back chamber is divided into buffer cavity and oil back chamber two-part; Can greatly reduce difficulty of processing like this, guarantee that the cushioning effect of damping device of same accuracy is in full accord.
Its concrete technological scheme is: a kind of cylinder cushion device, comprise 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 surpasses hydraulic fluid port; Piston is fixed on the piston rod, and described piston sleeve is contained in cylinder barrel inside; Adjacent side at piston is provided with the cushion collar that is sleeved on the piston rod, and cushion collar and piston rod are Spielpassung; Pressure ring is fixed by screws on the interior edge face of end cap; Floating ring is installed between pressure ring and the end cap, with the cushion collar Spielpassung.
Further preferred, on the described cushion collar institute's throttle orifice of opening size and quantity how much, guarantee that vertically its flow area is similar to the required orifice size of desirable isenthalp.
Further preferred, 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 not equidistant anisodiametric throttle orifice of unequal number amount in axial external surface.
Further preferred, the diameter of the internal surface in the close neutral position of described cushion collar is greater than the diameter of the two ends internal surface of cushion collar, and the internal surface of cushion collar and the outer surface of piston rod form annular oil cavity.
Further preferred, throttling passage comprises the flying height chamber between half round cut, pressure ring and the floating ring of annular oil cavity, center, cushion collar end of oil back chamber, cushion collar internal surface and piston rod formation between buffer cavity, piston rod and the end cap that throttle orifice on the described cushion collar, cushion collar outer surface and cylinder barrel form.
Further preferred, the half round cut on the described cushion collar conical surface communicates with oil back chamber with annular oil cavity, buffer cavity.
Further preferred, 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 the radial floating gap between floating ring and the pressure ring, the radial fit by floating ring and cushion collar is converted into the axial seal between floating ring and the end cap.
Further preferred, described floating ring is provided with through hole.
Further preferred, 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, quantity, size and the regularity of distribution by the throttle orifice on the suitable layout cushion collar, make orifice size closer to ideal curve, compensator or trimmer pressure is substantially near ideal curve, avoid hard impact, reduce soft impact, thereby the raising cushioning effect is impacted in the end of slowing down oil hydraulic cylinder; Simultaneously, the present invention need to not improve in order to guarantee concentric between cushion collar and the end cap quality of fit between 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 the end cap, only need to 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 the end cap interior edge face, and then can reduce damping device difficulty of processing and cut down finished cost.
Description of drawings
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 the cushion collar structural drawing;
Fig. 5 is the floating ring structural drawing;
Floating ring status figure when Fig. 6 is oppositely quick startup;
Fig. 7 is suite line chart when throttle hole area changes vertically on the cushion collar;
Fig. 8 is a kind of distribution of aperture on the 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 comprises piston 1, cylinder barrel 2, cushion collar 3, pressure ring 4, screw 5, floating ring 6, piston rod 7, end cap 8, and described oil hydraulic cylinder two ends are provided with end cap 8, and the length that end cap 8 stretches into cylinder body surpasses hydraulic fluid port, and interior edge face is had the cooperation requirement; Piston 1 is fixed on the piston rod 7, and described piston 1 is sleeved on cylinder barrel 2 inside; Adjacent side at piston 1 is provided with the cushion collar 3 that is sleeved on the piston rod 7, and cushion collar 3 is Spielpassung with piston rod 7, and cushion collar 3 can be along piston rod 7 axial floats; Pressure ring 4 is fixed on the interior edge face of end cap 8 by screw 5; Floating ring 6 is installed between pressure ring 4 and the end cap 8, and with cushion collar 3 Spielpassung, floating ring 6 can carry out axially 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 not equidistant anisodiametric throttle orifice of unequal number amount in axial external surface, makes orifice size more near ideal curve.The diameter of the internal surface in described cushion collar 3 close neutral positions is greater than the diameter of the two ends internal surface of cushion collar 3, and the outer surface of the internal surface of cushion collar 3 and piston rod 7 forms annular oil cavity 11.Throttling passage comprises the flying height chamber 13 between half round cut 12, pressure ring 4 and the floating ring 6 of annular oil cavity 11, center, cushion collar 3 end of oil back chamber 10, cushion collar 3 internal surfaces and piston rod 7 formation between buffer cavity 9, piston rod 7 and the end cap 8 that described cushion collar 3 outer surfaces and cylinder barrel 2 form.Half round cut 12 on described cushion collar 3 conical surfaces 14 communicates with oil back chamber 10 with annular oil cavity 11, buffer cavity 9.Described floating ring 6 outer surface diameter are 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 the radial floating gap between floating ring 6 and the pressure ring 4, the radial fit by floating ring 6 and motion cushion collar 3 is converted into the axial seal between floating ring 6 and the end cap 8.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 fluids approximates the effective active area of oil back chamber 10 inner fluids.
Described damping device can be installed in rod chamber, also can be installed in rodless cavity, also can rod chamber and rodless cavity install simultaneously.
When piston 1 moves right, because the huge quality of load, produce great inertial force, the piston 1 that causes for inertial force and the hydraulic coupling of eliminating because of piston and the mechanical collision between the end cap 8 have designed a kind of cylinder cushion device; When piston 1 moves to end of travel, floating ring 6 fits tightly the end cap interior edge face, the conical surface 14 of cushion collar 3 leading portions successfully imports in the hole of floating ring 6 it, floating ring 6 by and pressure ring 4 between radial clearance revise malalignment between the hole of cushion collar 3 and floating ring 6; The fluid of sealing up for safekeeping in buffer cavity flows into oil back chambers 10 by the throttle orifice 15 on the cushion collar 3 because the damping function of throttle orifice 15 so that the fluid in the oil back chamber produce with the piston running in the braking force of resisting mutually, reach the purpose of deceleration; When piston needed reverse starting, floating ring 6 fitted tightly pressure ring 4, and hydraulic oil is by the flying height 13 between floating ring 6 and the pressure ring 4, and the hole 16 on the floating ring 6 and the common oil-feed of half round cut on the cushion collar 3 realize oppositely starting fast of piston.
Be applied to the situation of rod chamber such as Fig. 2 damping device, 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 annular oil cavity 11 between cushion collar 3 and the piston rod 7, enters oil back chamber 10 by the half round cut 12 on the cushion collar 3 by the throttle orifice 15 on the cushion collar 3, produce certain pressure-acting on effective cushion area at buffer cavity 9, stop the motion of piston, thereby play the speed of slowing down piston, slow down the purpose of impact.
Be applied to the situation of rodless cavity such as Fig. 3 damping device, the other the same as in Example 1.
Oppositely start fast, when the fluid in the 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 the pressure ring, oil through 16 on the floating ring 6 and the common oil-feed of half round cut on the cushion collar 3, larger flow area so that piston when starting back pressure lower, piston can start fast.
Reverse slow start, when pressure ring processing very thin, axial float gap between pressure ring and the floating ring is very little, so hydraulic oil can only enter by the half round cut 12 on the cushion collar annular pass 11 between cushion collar 3 and the piston rod 7, then throttle orifice 15 by on the cushion collar 3 flows into buffer cavity 9.So can reach different toggle speeds by the number of adjusting the oil through 16 on flying height and the floating ring 6.The other the same as in Example 3.
In actual production, can analyze according to the requirement of concrete operating mode and to obtain the curve that desirable orifice size changes with stroke, utilize throttle orifice to go the simulate ideal orifice size, Fig. 8 provided a kind of when the throttle orifice diameter is 1mm every row's aperture quantity and arrange the distribution map of distance between the aperture; In addition, when working condition changes, come the simulate ideal orifice size by changing throttle orifice diameter, the quantity of every row's aperture and the distance of arranging between the aperture, reach shock-free cushioning effect.
The above; only be the better embodiment of the present invention; protection scope of the present invention is not limited to this; 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 (8)
1. 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 surpasses hydraulic fluid port; Piston (1) is fixed on the piston rod (7), and described piston (1) is sleeved on cylinder barrel (2) inside; Adjacent side at piston (1) is provided with the cushion collar (3) that is sleeved on the piston rod (7), and cushion collar (3) is Spielpassung with piston rod (7); Pressure ring (4) is fixed on the interior edge face of end cap (8) by screw (5); Floating ring (6) is installed between pressure ring (4) and the end cap (8), with cushion collar (3) Spielpassung.
2. cylinder cushion device according to claim 1, it is characterized in that, 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 not equidistant anisodiametric throttle orifice of unequal number amount (15) in axial external surface.
3. 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 outer surface of the internal surface of cushion collar (3) and piston rod (7) forms annular oil cavity (11).
4. cylinder cushion device according to claim 1, it is characterized in that, throttling passage comprises the throttle orifice (15) on the cushion collar, the buffer cavity (9) that described cushion collar (3) outer surface and cylinder barrel (2) form, oil back chamber (10) between piston rod (7) and the end cap (8), the annular oil cavity (11) that cushion collar (3) internal surface and piston rod (7) form, the half round cut (12) of cushion collar (3) center, end, flying height chamber (13) between pressure ring (4) and the floating ring (6).
5. each described cylinder cushion device according to claim 1-4, 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).
6. 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) with end cap (8), described floating ring (6) and cushion collar (3) Spielpassung of moving, leave the radial floating gap between floating ring (6) and the pressure ring (4), the radial fit by floating ring (6) and motion cushion collar (3) is converted into the axial seal between floating ring (6) and the end cap (8).
7. cylinder cushion device according to claim 1 is characterized in that, described floating ring (6) is provided with through hole.
8. cylinder cushion device according to claim 1 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 true CN103352958A (en) | 2013-10-16 |
| CN103352958B CN103352958B (en) | 2016-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310290341.2A Expired - Fee Related CN103352958B (en) | 2013-07-02 | 2013-07-02 | A kind of hydraulic pressure cylinder cushion |
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Cited By (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 |
| CN109990034A (en) * | 2017-12-29 | 2019-07-09 | 邱燕端 | A kind of three section controllable gas springs |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BG38433A1 (en) * | 1983-05-30 | 1985-12-16 | Georgiev | Hydraulic percussion mechanism |
| DE59700385D1 (en) * | 1996-08-23 | 1999-10-07 | Ace Stosdaempfer Gmbh | Industrial shock absorbers |
| 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 |
| 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 |
| 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 |
-
2013
- 2013-07-02 CN CN201310290341.2A patent/CN103352958B/en not_active Expired - Fee Related
Cited By (3)
| 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 |
| CN109990034A (en) * | 2017-12-29 | 2019-07-09 | 邱燕端 | A kind of three section controllable gas springs |
| CN109990034B (en) * | 2017-12-29 | 2024-04-02 | 邱燕端 | Three-section controllable gas spring |
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| Publication number | Publication date |
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| CN103352958B (en) | 2016-03-23 |
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