CN103939419A - Hydraulic cylinder constant throttling adjustable buffering device - Google Patents
Hydraulic cylinder constant throttling adjustable buffering device Download PDFInfo
- Publication number
- CN103939419A CN103939419A CN201310456113.8A CN201310456113A CN103939419A CN 103939419 A CN103939419 A CN 103939419A CN 201310456113 A CN201310456113 A CN 201310456113A CN 103939419 A CN103939419 A CN 103939419A
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- China
- Prior art keywords
- end cover
- oil
- rear end
- hydraulic cylinder
- oil duct
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Abstract
A hydraulic cylinder constant throttling adjustable buffering device comprises a buffering sleeve arranged at the front end of a piston of a piston rod. The outer diameter of the buffering sleeve is smaller than the outer diameter of the piston. A concave part for being matched with the buffering sleeve is arranged on a back end cover of a hydraulic cylinder. A sealing ring is arranged on the buffering sleeve. An oil-in-out channel and a buffering oil channel which are independent are arranged on a back end cover. The oil-in-out channel is communicated with a hydraulic system through an oil channel. After the sealing ring is in contact with the inner periphery wall of a concave part, an oil cavity defined by the outer wall of the buffering sleeve, the inner end face of the back end cover, the inner wall of a cylinder body of the hydraulic cylinder and the end face of the piston forms a buffering cavity. The portion, at the inner end face of the back end cover, of the oil-in-out channel is provided with a single-way valve. The buffering oil channel which is used for oil liquid in the buffering cavity to flow back to the hydraulic system through the oil-in-out channel after the sealing ring and the inner periphery wall of the concave part are in contact is provided with a throttling valve for controlling flow. The drum-shaped sealing ring is used for sealing, sealing performance is good, by adjusting the throttling valve, the effect of flow adjusting is achieved, buffering effect is achieved, and constant throttling adjustable performance is achieved.
Description
Technical field
The present invention is the permanent throttling adjustable buffer device of a kind of oil hydraulic cylinder, and specifically when a kind of hydraulic cylinder works, pressure oil liquid promotes piston rod to-and-fro motion, while preventing that piston rod movement from arriving bottom, speed, larger to connection device impact, the damping device of installing at tailpiece of the piston rod.
Background technique
At present, known oil hydraulic cylinder throttling buffering device has two kinds, a kind of is that one section of damping device cylindrical is straight, be with tapering for one section, buffering is that the endoporus being mated by damping device cylindrical coordinates realization, matching gap is very little, conventionally matching gap is between 0.04-0.10mm, the coaxality of known its cylindrical of throttling buffering matching requirements and endoporus requires very high, surface finishment requires high, very high to manufacturing process requirement, if do not reach requirement, will cause not obvious less than buffering or cushioning effect; A kind of is that damping device cylindrical is straight, on damping device cylindrical, process a circular groove, on circular groove, fill upper O-shape ring, the endoporus coaxality that this structure requires damping device cylindrical to be mated is equally high, the endoporus that damping device cylindrical is mated is transition fit, require gap very little, very high to the same requirement of manufacturing process.
Summary of the invention
Goal of the invention of the present invention is to overcome the above-mentioned deficiency of prior art and provides one can not only realize permanent throttling, and can realize the permanent throttling adjustable buffer device of the adjustable oil hydraulic cylinder of throttling size.
Technological scheme of the present invention is: comprise the cushion collar that is loaded on piston rod piston nose; Cushion collar external diameter is less than piston external diameter; Oil hydraulic cylinder rear end cover is provided with the recess for coordinating with cushion collar; Seal ring with rear end cover recess fitted seal is housed on cushion collar; Rear end cover is provided with the buffering oil duct of turnover oil duct, connection recess bottom surface and the rear end cover interior edge face of separate connection recess bottom surface and rear end cover interior edge face; Described turnover oil duct is connected with hydraulic system through oil duct.
After seal ring contacts with recess inner peripheral wall, the oil pocket that cushion collar outer wall and rear end cover interior edge face, hydraulic cylinder body inwall, piston end surface surround forms buffer cavity.
Turnover oil duct is positioned at rear end cover interior edge face place and is provided with and after seal ring contacts with recess inner peripheral wall, prevents that buffer cavity inner fluid from flowing back to the one-way valve of hydraulic system through passing in and out oil duct.
On the buffering oil duct that is used for making buffer cavity inner fluid flow back to hydraulic system through turnover oil duct, be provided with the throttle valve for controlling flow after seal ring contacts with recess inner peripheral wall.
Described rear end cover is provided with and the throttle valve mounting hole that cushions oil duct and be connected; In described throttle valve mounting hole, be provided with stepped part; Throttle valve end is provided with the conical surface that coordinates throttling with throttle valve mounting hole stepped part.
Described cushion collar outer wall is provided with the circular groove for seal ring is installed.
Described seal ring is drum-shape sealing ring.
The difference of described rear end cover recess internal diameter and cushion collar external diameter is not more than 1mm.
The degree of finish of described cushion collar outer wall and rear end cover recess inwall is Ra0.8.
Compared with prior art, the present invention is simple in structure, and less demanding to product coaxality, product is easily processed, and delivery-check qualified rate of product is high.The present invention adopts drum-shape sealing ring sealing, has good seal performance,, cushion collar cylindrical less demanding to cushion collar cylindrical and the rear end cover recess coaxality that is mated and the large feature in rear end cover recess gap being mated; And by regulating throttle valve, reach adjust flux, reduce the effect of piston rod movement speed.The present invention can not only realize buffer function, and can realize the adjustable effect of permanent throttling.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.(throttle valve cuts out completely, and piston rod movement is to SOT state of termination)
Fig. 2 is structural representation of the present invention.(throttle valve is opened completely, and on cushion collar, seal ring enters rear end cover and seals)
Fig. 3 is structural representation of the present invention.(throttle valve cuts out completely, and cushion collar does not enter rear end cover state)
Fig. 4 is the partial enlarged drawing of Fig. 2.(the complete opening state of throttle valve)
Fig. 5 is the partial enlarged drawing of Fig. 1.(throttle valve buttoned-up status)
Fig. 6 is the structural representation of cushion collar.
In figure, 1, cushion collar, 2, piston rod, 3, rear end cover, 4, recess, 5, seal ring, 6, turnover oil duct, 7, piston, 8, buffering oil duct, 9, buffer cavity, 10, one-way valve, 11, throttle valve, 12, throttle valve mounting hole, 13, stepped part, 14, the conical surface, 15, oil duct, 16, cylinder body, 17, guide sleeve, 18, oil duct, 19, rear end cover interior edge face, 20, recess bottom surface.
Embodiment
In Fig. 1, cushion collar 1 is threaded connection with piston rod 2.Rear end cover 3 is provided with the buffering oil duct 8 of turnover oil duct 6, connection recess bottom surface 20 and the rear end cover interior edge face 19 of separate connection recess bottom surface 20 and rear end cover interior edge face 19.One-way valve 10 cylindricals have screw thread, and the oil duct 15 in turnover oil duct 6 has screw thread, and one-way valve 10 is threaded with oil duct 15.Throttle valve 11 cylindricals have screw thread, and rear end cover 3 throttle valve mounting holes 12 have screw thread, and throttle valve 11 is threaded with rear end cover 3 throttle valve mounting holes 12.Rear end cover 3 is welded and fixed with cylinder body 16.Cylinder body 16 is connected with guide sleeve 17 bolts.It is upper that piston 7 is arranged on piston rod 2 multidiameter shafts (2-1), piston 7 right sides (7-1) and the laminating of piston rod 2 multidiameter shafts (2-1) right side, piston 7 left sides (7-2) and cushion collar 1 right side (1-1) laminating.
In Fig. 2, when external pressure fluid promotes piston 7, cushion collar 1 and piston rod 2 associated movements by guide sleeve 17 oil ducts (17-1), when on cushion collar 1, seal ring 5 enters rear end cover 3 recess 4, seal, the oil pocket that cushion collar 1 outer wall and rear end cover 3 interior edge faces 19, hydraulic cylinder body inwall, piston 7 end faces surround forms buffer cavity 9, one-way valve 10 is closed, fluid enters buffering oil duct 8 by buffer cavity 9, size a is 0 o'clock, throttle valve 11 cuts out completely, and fluid can not enter buffering oil duct 8 by buffer cavity 9, turnover oil duct 6 is got back to hydraulic system.Rotary barrel throttle 11, the size of adjustment size a, i.e. capable of regulating flow quantity, fluid enters turnover oil duct 6 by buffering oil duct 8 and gets back to hydraulic system through oil duct 18.
In Fig. 3, when external pressure fluid is by rear end cover 3 oil ducts 18, enter oil duct 15, push one-way valve 10 open, fluid promotes piston 7, cushion collar 1 and piston rod 2 associated movements, and cushion collar 1 leaves rear end cover 3 recesses 4.
When external pressure fluid promotes piston 7, cushion collar 1 and piston rod 2 associated movements by guide sleeve 17 oil ducts (17-1), when on cushion collar 1, seal ring 5 does not enter rear end cover 3 recess 4, fluid enters turnover oil duct 6 by rear end cover 3 recesses 4 and gets back to hydraulic system through oil duct 18.
Fig. 4 is throttle valve schematic diagram while opening completely, when throttle valve is opened completely, without throttling action.Rear end cover 3 is provided with and the throttle valve mounting hole 12 that cushions oil duct 8 and be connected, and is provided with stepped part 13 in throttle valve mounting hole, and throttle valve 11 ends are provided with the conical surface 14 that coordinates throttling with throttle valve mounting hole stepped part 13.
Fig. 5 is throttle valve schematic diagram while closing completely, and throttle valve 11 cuts out while opening completely, buffering oil duct 8 and the obstructed fluid of buffer cavity.
In Fig. 6, seal ring 5 is arranged on the circular groove of cushion collar 1.
Claims (6)
1. the permanent throttling adjustable buffer device of oil hydraulic cylinder, is characterized in that: comprise the cushion collar (1) that is loaded on piston rod (2) piston (7) front end; Cushion collar (1) external diameter is less than piston (7) external diameter; Oil hydraulic cylinder rear end cover (3) is provided with the recess (4) for coordinating with cushion collar (1); Seal ring (5) with rear end cover (3) recess (4) fitted seal is housed on cushion collar (1); Rear end cover (3) is provided with the buffering oil duct (8) of turnover oil duct (6), connection recess bottom surface (20) and the rear end cover interior edge face (19) of separate connection recess bottom surface (20) and rear end cover interior edge face (19); Described turnover oil duct (6) is connected with hydraulic system through oil duct (18);
After seal ring (5) contacts with recess (4) inner peripheral wall, the oil pocket that cushion collar (1) outer wall and rear end cover interior edge face (19), hydraulic cylinder body inwall, piston (7) end face surround forms buffer cavity (9);
Turnover oil duct (6) is positioned at rear end cover interior edge face (19) and locates to be provided with and after seal ring (5) contacts with recess (4) inner peripheral wall, prevent that buffer cavity (9) inner fluid from flowing back to the one-way valve (10) of hydraulic system through passing in and out oil duct (6);
On the buffering oil duct (8) that is used for making buffer cavity (9) inner fluid flow back to hydraulic system through turnover oil duct (6), be provided with the throttle valve (11) for controlling flow after seal ring (5) contacts with recess (4) inner peripheral wall.
2. the permanent throttling adjustable buffer device of oil hydraulic cylinder according to claim 1, is characterized in that: described rear end cover (3) is provided with and the throttle valve mounting hole (12) that cushions oil duct (8) and be connected; In described throttle valve mounting hole (12), be provided with stepped part (13); Throttle valve (11) end is provided with the conical surface (14) that coordinates throttling with throttle valve mounting hole (12) stepped part (13).
3. the permanent throttling adjustable buffer device of oil hydraulic cylinder according to claim 1, is characterized in that: described cushion collar (1) outer wall is provided with the circular groove for seal ring (5) are installed.
4. according to the permanent throttling adjustable buffer device of the oil hydraulic cylinder described in claim 1 or 3, it is characterized in that: described seal ring (5) is drum-shape sealing ring.
5. the permanent throttling adjustable buffer device of oil hydraulic cylinder according to claim 1, is characterized in that: the difference of described rear end cover (3) recess (4) internal diameter and cushion collar (1) external diameter is not more than 1mm.
6. the permanent throttling adjustable buffer device of oil hydraulic cylinder according to claim 1, is characterized in that: the degree of finish of described cushion collar (1) outer wall and rear end cover (3) recess (4) inwall is Ra0.8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310456113.8A CN103939419A (en) | 2013-09-30 | 2013-09-30 | Hydraulic cylinder constant throttling adjustable buffering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310456113.8A CN103939419A (en) | 2013-09-30 | 2013-09-30 | Hydraulic cylinder constant throttling adjustable buffering device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103939419A true CN103939419A (en) | 2014-07-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310456113.8A Pending CN103939419A (en) | 2013-09-30 | 2013-09-30 | Hydraulic cylinder constant throttling adjustable buffering device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103939419A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105201957A (en) * | 2015-09-14 | 2015-12-30 | 江苏恒立高压油缸股份有限公司 | Piston plane self-sealing structure for hydraulic cylinder |
| CN106151164A (en) * | 2016-08-23 | 2016-11-23 | 马鞍山市裕华机械制造有限公司 | A kind of plate shearing machine cylinder of adjustable buffering |
| CN108799252A (en) * | 2018-08-06 | 2018-11-13 | 山西航天清华装备有限责任公司 | The adjustable hydraulic cylinder of bidirectional buffering speed |
| CN108799252B (en) * | 2018-08-06 | 2024-04-16 | 山西航天清华装备有限责任公司 | Hydraulic cylinder with adjustable bidirectional buffering speed |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3613503A (en) * | 1969-04-28 | 1971-10-19 | Cessna Aircraft Co | Hydraulic cylinder with pressure control |
| CN201330768Y (en) * | 2008-12-05 | 2009-10-21 | 韶关液压件厂有限公司 | Floating type cushioning device for hydraulic cylinder |
| CN201747693U (en) * | 2010-07-16 | 2011-02-16 | 江苏龙城洪力液压设备有限公司 | Hydraulic cylinder with buffer function |
| CN202673869U (en) * | 2012-07-13 | 2013-01-16 | 李新德 | Large-scale gate type plate shearing machine hydraulic cylinder with buffer function |
| CN203500176U (en) * | 2013-09-30 | 2014-03-26 | 湖北江山液压科技有限公司 | Constant-throttling adjustable buffering device of hydraulic cylinder |
-
2013
- 2013-09-30 CN CN201310456113.8A patent/CN103939419A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3613503A (en) * | 1969-04-28 | 1971-10-19 | Cessna Aircraft Co | Hydraulic cylinder with pressure control |
| CN201330768Y (en) * | 2008-12-05 | 2009-10-21 | 韶关液压件厂有限公司 | Floating type cushioning device for hydraulic cylinder |
| CN201747693U (en) * | 2010-07-16 | 2011-02-16 | 江苏龙城洪力液压设备有限公司 | Hydraulic cylinder with buffer function |
| CN202673869U (en) * | 2012-07-13 | 2013-01-16 | 李新德 | Large-scale gate type plate shearing machine hydraulic cylinder with buffer function |
| CN203500176U (en) * | 2013-09-30 | 2014-03-26 | 湖北江山液压科技有限公司 | Constant-throttling adjustable buffering device of hydraulic cylinder |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105201957A (en) * | 2015-09-14 | 2015-12-30 | 江苏恒立高压油缸股份有限公司 | Piston plane self-sealing structure for hydraulic cylinder |
| CN106151164A (en) * | 2016-08-23 | 2016-11-23 | 马鞍山市裕华机械制造有限公司 | A kind of plate shearing machine cylinder of adjustable buffering |
| CN108799252A (en) * | 2018-08-06 | 2018-11-13 | 山西航天清华装备有限责任公司 | The adjustable hydraulic cylinder of bidirectional buffering speed |
| CN108799252B (en) * | 2018-08-06 | 2024-04-16 | 山西航天清华装备有限责任公司 | Hydraulic cylinder with adjustable bidirectional buffering speed |
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Application publication date: 20140723 |