CN104121251A - Buffering device for hydraulic cylinder - Google Patents
Buffering device for hydraulic cylinder Download PDFInfo
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- CN104121251A CN104121251A CN201410342118.2A CN201410342118A CN104121251A CN 104121251 A CN104121251 A CN 104121251A CN 201410342118 A CN201410342118 A CN 201410342118A CN 104121251 A CN104121251 A CN 104121251A
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Abstract
The invention relates to a buffering device for a hydraulic cylinder. The buffering device comprises a cylinder body, wherein an oil hole is formed in one side of the cylinder body, a piston rod is arranged in an inner cavity of the cylinder body, and a piston in sliding match with the inner cavity of the cylinder body is arranged on the piston rod. The piston rod is of a step-shaped structure, a travel check block is arranged at the step position, a reset spring is arranged in an inner cavity of the travel check block, and one end of the reset spring abuts against the piston. An annular groove is formed in the end face of the travel check block and right faces the bottom side of the cylinder body. When the piston rod moves to the travel tail end, the travel check block is limited by the end face on the bottom side of the hydraulic cylinder, the piston rod stops moving, a throttling gap is formed between the piston and the travel check block, pressure of the cavity between the piston and the travel check block increases and resists to inertia force of the piston and hydraulic force applying on the left end of the piston, and therefore, the buffering purpose is achieved. By means of the annular groove, extruded force-borne hydraulic oil flows into the annular groove, the movement speed of the piston rod and the piston is decreased, and impact force of the piston is reduced.
Description
Technical field
The present invention relates to oil hydraulic cylinder technical field, relate in particular to a kind of cylinder cushion device.
Background technique
The normal mechanism that uses Driven by Hydraulic Cylinder to there is certain mass in hydraulic system, when hydraulic cylinder has larger kinetic energy during to stroke end, as do not done, slow down and process, under the effect of inertial force and hydraulic coupling, to there is mechanical collision in hydraulic cylinder piston and cylinder cap, produce impact, noise, have destructiveness, be relax and prevent that this harm from occurring, and need establish damping device in cylinder body.Traditional damping device is in the segment distance before piston arrives stroke terminal, manage that part or all seals up in an oil-discharging cavity, by throttling pore, discharge, thereby the fluid that makes to be closed produces in the oil extraction side that suitable compensator or trimmer pressure acts on piston, resist mutually with the inertial force of piston, thereby reach the object of retarding braking.But there is following deficiency: because damping device acts on end, when cushion stroke is larger, the quality of oil hydraulic cylinder increases; When oil hydraulic cylinder high-speed motion, in oil-discharging cavity, peak value compensator or trimmer pressure is very large, causes cylinder barrel wall thickness to increase, and the quality of oil hydraulic cylinder increases.Simultaneously not only complex structure, manufacture cost are high for the existing oil hydraulic cylinder with damping device, but also need higher assembly precision.
Summary of the invention
The present invention, in order to overcome deficiency of the prior art, provides a kind of cylinder cushion device, and this apparatus structure is simple, can make the speed of oil hydraulic cylinder reduce reposefully, effectively reduces the impact force that cylinder barrel bears, thereby obtains good cushioning effect.
The present invention is achieved through the following technical solutions:
A cylinder cushion device, comprises cylinder body, and cylinder body one side is provided with oilhole, is provided with piston rod in inner chamber of cylinder block, and piston rod is provided with the piston being slidably matched with inner chamber of cylinder block; It is characterized in that:
Described piston rod is ladder-type structure, and at ladder, place is provided with stroke dog, the Returnning spring in installing in the inner chamber of described stroke dog, and one end contact of described Returnning spring is on piston;
The bottom side of described cylinder body and stroke dog end face over against position offer annular groove.
As the preferred technical solution of the present invention, between described piston rod and piston, by fastening nuts, be connected, so just can according to actual operation requirements, change easily physical dimension and the structural type of stroke dog, reach satisfactory cushioning effect.
As the preferred technical solution of the present invention, the cross section of described annular groove is rectangle.
As the preferred technical solution of the present invention, between described piston and cylinder body, seal ring is installed; Seal ring is also installed between described piston rod and cylinder body.
Compared with prior art, the invention has the beneficial effects as follows: the present invention is when hydraulic cylinder works, when piston rod movement arrives end of travel, stroke dog is spacing by the bottom side end face of oil hydraulic cylinder, thereby stop motion, and piston, piston rod, nut move forward under the effect of inertial force and hydraulic coupling, at this moment between piston and stroke dog, form throttle chink, cavity volume pressure between piston and stroke dog increases, resist mutually with the inertial force of piston and the hydraulic coupling that acts on piston left end, thereby reach the object of buffering; By offering annular groove, be extruded stressed hydraulic oil and enter in annular groove, and then slow down the movement velocity of piston rod and piston, reduce the impact force of piston to end cap.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: 1-cylinder body; 2-piston rod; 3-piston; 4-stroke dog; 5-Returnning spring; 6-annular groove; 7-nut; 8-seal ring.
Embodiment
In order to make object of the present invention, technological scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to Fig. 1, Fig. 1 is structural representation of the present invention.
Described a kind of cylinder cushion device, comprises cylinder body 1, and cylinder body 1 one sides are provided with oilhole, in cylinder body 1 inner chamber, is provided with piston rod 2, and piston rod 2 is provided with the piston 3 being slidably matched with cylinder body 1 inner chamber; Described piston rod 2 is ladder-type structure, at ladder place, is provided with stroke dog 4, the Returnning spring 5 in installing in the inner chamber of described stroke dog 4, and one end contact of described Returnning spring 5 is on piston 3.When piston rod movement arrives end of travel, stroke dog is spacing by the bottom side end face of oil hydraulic cylinder, thereby stop motion, and piston, piston rod, nut move forward under the effect of inertial force and hydraulic coupling, at this moment between piston and stroke dog, form throttle chink, by changing orifice size (orifice size increases and reduces with stroke), cavity volume pressure between piston and stroke dog increases, resist mutually with the inertial force of piston and the hydraulic coupling that acts on piston left end, thereby reach the object of buffering.
The bottom side of described cylinder body 1 and stroke dog 4 end faces over against position offer annular groove 6, the cross section of described annular groove 6 is rectangle.By offering annular groove, be extruded stressed hydraulic oil and enter in annular groove, and then slow down the movement velocity of piston rod and piston, reduce the impact force of piston to end cap.
Between described piston rod 2 and piston 3, by nut 7, be fastenedly connected, compact structure, connects simply, can according to actual operation requirements, change easily physical dimension and the structural type of stroke dog, reach satisfactory cushioning effect.
Between described piston 3 and cylinder body 1, seal ring 8 is installed; Between described piston rod 2 and cylinder body 1, seal ring 8 is also installed, prevents from revealing.Seal ring may be selected to be "O"-ring or " Y " type circle.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. a cylinder cushion device, comprise cylinder body (1), cylinder body (1) one side is provided with oilhole, in cylinder body (1) inner chamber, is provided with piston rod (2), and piston rod (2) is provided with the piston (3) being slidably matched with cylinder body (1) inner chamber; It is characterized in that:
Described piston rod (2) is ladder-type structure, at ladder place, be provided with stroke dog (4), Returnning spring (5) in installing in the inner chamber of described stroke dog (4), one end contact of described Returnning spring (5) is on piston (3);
The bottom side of described cylinder body (1) and stroke dog (4) end face over against position offer annular groove (6).
2. a kind of cylinder cushion device according to claim 1, is characterized in that: between described piston rod (2) and piston (3), by nut (7), be fastenedly connected.
3. a kind of cylinder cushion device according to claim 1, is characterized in that: the cross section of described annular groove (6) is rectangle.
4. a kind of cylinder cushion device according to claim 2, is characterized in that: between described piston (3) and cylinder body (1), seal ring (8) is installed; Between described piston rod (2) and cylinder body (1), seal ring (8) is also installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410342118.2A CN104121251A (en) | 2014-07-17 | 2014-07-17 | Buffering device for hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410342118.2A CN104121251A (en) | 2014-07-17 | 2014-07-17 | Buffering device for hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104121251A true CN104121251A (en) | 2014-10-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410342118.2A Pending CN104121251A (en) | 2014-07-17 | 2014-07-17 | Buffering device for hydraulic cylinder |
Country Status (1)
| Country | Link |
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| CN (1) | CN104121251A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105156399A (en) * | 2015-08-24 | 2015-12-16 | 济南大学 | Self-adaptation sealing, anti-loosening and auxiliary motion device of hydraulic cylinder piston |
| CN107084169A (en) * | 2017-06-22 | 2017-08-22 | 南通爱慕希机械股份有限公司 | A kind of ram cylinder |
| CN109114069A (en) * | 2018-10-30 | 2019-01-01 | 济南夫驰科技有限公司 | A kind of built-in spring-compressed cushion cylinder |
| CN109322871A (en) * | 2018-11-30 | 2019-02-12 | 湖南协力液压有限公司 | A kind of hydraulic cylinder that can automatically reset |
| WO2024065587A1 (en) * | 2022-09-30 | 2024-04-04 | Graco Minnesota Inc. | Pump stroke extension apparatus and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201391511Y (en) * | 2009-03-26 | 2010-01-27 | 安徽星马汽车股份有限公司 | Hydraulic cylinder cushioning device |
| CN201554719U (en) * | 2009-11-13 | 2010-08-18 | 浙江工业大学 | High-speed two-out bar hydraulic cylinder cushion device |
| CN102108991A (en) * | 2010-07-23 | 2011-06-29 | 三一重工股份有限公司 | Hydraulic cylinder and relative device thereof, hydraulic buffer system, excavator and concrete pump truck |
| CN102691695A (en) * | 2011-03-23 | 2012-09-26 | 三一重工股份有限公司 | Buffering hydraulic cylinder and control method thereof as well as engineering machine |
| CN202768523U (en) * | 2012-08-17 | 2013-03-06 | 徐州徐工挖掘机械有限公司 | Bi-directional automatic buffering hydraulic oil cylinder |
| CN203685765U (en) * | 2013-11-28 | 2014-07-02 | 徐工集团工程机械股份有限公司道路机械分公司 | Oil cylinder buffering structure |
-
2014
- 2014-07-17 CN CN201410342118.2A patent/CN104121251A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201391511Y (en) * | 2009-03-26 | 2010-01-27 | 安徽星马汽车股份有限公司 | Hydraulic cylinder cushioning device |
| CN201554719U (en) * | 2009-11-13 | 2010-08-18 | 浙江工业大学 | High-speed two-out bar hydraulic cylinder cushion device |
| CN102108991A (en) * | 2010-07-23 | 2011-06-29 | 三一重工股份有限公司 | Hydraulic cylinder and relative device thereof, hydraulic buffer system, excavator and concrete pump truck |
| CN102691695A (en) * | 2011-03-23 | 2012-09-26 | 三一重工股份有限公司 | Buffering hydraulic cylinder and control method thereof as well as engineering machine |
| CN202768523U (en) * | 2012-08-17 | 2013-03-06 | 徐州徐工挖掘机械有限公司 | Bi-directional automatic buffering hydraulic oil cylinder |
| CN203685765U (en) * | 2013-11-28 | 2014-07-02 | 徐工集团工程机械股份有限公司道路机械分公司 | Oil cylinder buffering structure |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105156399A (en) * | 2015-08-24 | 2015-12-16 | 济南大学 | Self-adaptation sealing, anti-loosening and auxiliary motion device of hydraulic cylinder piston |
| CN107084169A (en) * | 2017-06-22 | 2017-08-22 | 南通爱慕希机械股份有限公司 | A kind of ram cylinder |
| CN109114069A (en) * | 2018-10-30 | 2019-01-01 | 济南夫驰科技有限公司 | A kind of built-in spring-compressed cushion cylinder |
| CN109322871A (en) * | 2018-11-30 | 2019-02-12 | 湖南协力液压有限公司 | A kind of hydraulic cylinder that can automatically reset |
| WO2024065587A1 (en) * | 2022-09-30 | 2024-04-04 | Graco Minnesota Inc. | Pump stroke extension apparatus and method |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141029 |