CN202441669U - Pneumatic/hydraulic cylinder with buffering mechanism - Google Patents

Pneumatic/hydraulic cylinder with buffering mechanism Download PDF

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Publication number
CN202441669U
CN202441669U CN201220062820XU CN201220062820U CN202441669U CN 202441669 U CN202441669 U CN 202441669U CN 201220062820X U CN201220062820X U CN 201220062820XU CN 201220062820 U CN201220062820 U CN 201220062820U CN 202441669 U CN202441669 U CN 202441669U
Authority
CN
China
Prior art keywords
permanent magnet
piston
hydraulic cylinder
cylinder
buffering
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201220062820XU
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Chinese (zh)
Inventor
钟康民
王传洋
肖莹华
司广琚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzhou University
Original Assignee
Suzhou University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Suzhou University filed Critical Suzhou University
Priority to CN201220062820XU priority Critical patent/CN202441669U/en
Application granted granted Critical
Publication of CN202441669U publication Critical patent/CN202441669U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a pneumatic/hydraulic cylinder with a buffering mechanism. The pneumatic/hydraulic cylinder comprises a piston, a cylinder body and an end cover fixed on the cylinder body, wherein a first permanent magnet is fixedly arranged on the inner side of the end cover; the end face of the piston which is opposite to the first permanent magnet is provided with a second permanent magnet; and opposite ends of the first permanent magnet and the second permanent magnet are of the same polarity. The repulsive force between the first permanent magnet and the second permanent magnet is increased nonlinearly rapidly, so that the buffering braking distance is shortened greatly. The axial size of the first permanent magnet is small, so that the axial size of the end cover is reduced remarkably in comparison to a buffering device with a plunger type throttling buffering cavity.

Description

The gas, the oil hydraulic cylinder that have damping mechanism
Technical field
The utility model relates to a kind of gas, oil hydraulic cylinder, is specifically related to a kind of gas, oil hydraulic cylinder that has damping mechanism.
Background technique
When the piston of the gas of extensive use, oil hydraulic cylinder rapidly moved to the end in the industry, the piston movement speed that all can form mechanical shock, particularly cylinder was very fast, impacted even more serious.This mechanical shock, the noise that not only can impact, and the working life of meeting appreciable impact related elements.When its terminal is arrived in the piston motion of gas, oil hydraulic cylinder; The kinetic energy of piston and pressure can cause the greater impact between piston and the end cap; This problem is difficult to be resolved satisfactorily always, and the buffering research of gas, oil hydraulic cylinder becomes a research focus at present domestic and international this field.Therefore, on cylinder and the oil hydraulic cylinder of speed, all need adopt damping mechanism greater than 0.2m/s.Both at home and abroad gas, the oil hydraulic cylinder of band damping mechanism commonly used all be basically the mode with exhaust throttle and reverse back pressure effect reduce piston movement velocity to reach the purpose that reduces or eliminate impact.
Plain edition single-piston rod double-acting cylinder as shown in Figure 1; Cylinder barrel is with after front and rear cover (being furnished with seal ring) is connected; Inner chamber forms a sealed space; A piston that links to each other with piston rod is arranged in this sealed space, seal ring is housed on the piston, piston is divided into two chambers to this sealed space.The front and rear cover of cylinder is provided with damping device, and damping device is made up of buffer throttling valve, buffer plunger and buffering seal ring etc.When cylinder stroke during, because the effect of damping device, can prevent the piston slap cylinder cap of high-speed motion near the terminal.
Above-mentioned damping device exists following shortcoming: a, cushioning effect poor; The movement velocity of b, piston is difficult for improving; The volume of c, gas, oil hydraulic cylinder is big; D, need add cover gas, a hydraulic pressure circulatory system, the throttling of control back pressure cavity liquid return produces damping and realizes buffer function, and complex structure is used inconvenience.
Summary of the invention
The goal of the invention of the utility model provides a kind of gas, oil hydraulic cylinder that has damping mechanism, and through the improvement of structure, simple in structure, compact, cost is low, and buffer distance is short, good buffer effect.
For reaching the foregoing invention purpose; The technological scheme that the utility model adopts is: a kind of gas, oil hydraulic cylinder that has damping mechanism; Comprise piston, cylinder body and be fixed on the end cap on the cylinder body; The inboard of said end cap is installed with first permanent magnet, and the piston end surface relative with this first permanent magnet is provided with second permanent magnet, and said first permanent magnet is identical with the polarity of the second permanent magnet opposite end.
In the technique scheme, be provided with first magnetic shield between said first permanent magnet and the end cap, be provided with second magnetic shield between said second permanent magnet and the piston.
Pass through said structure; When the piston of gas, oil hydraulic cylinder approaches end cap; Mutual repulsive force between first, second permanent magnet increases sharply, thereby the motion of piston is produced buffer-braking, and the movement velocity that reduces piston is to reach the purpose that reduces or eliminate impact.
Because the technique scheme utilization, the utility model compared with prior art has advantage:
1. first permanent magnet of the utility model and the repulsive force between second permanent magnet are to be non-linear quick increase, have therefore shortened the buffer-braking distance greatly; Simultaneously, the axial dimension of first permanent magnet is less, therefore compares with the damping device that adopts plunger type throttling buffer cavity, and the axial dimension of end cap obviously dwindles, so the utility model overall structure is simple, volume is little.
2. the utility model is low to the seal request between piston and the cylinder body, and part is prone to processing, and cost is low.
3. the utility model is being equipped with magnetic shield between first permanent magnet and the end cap and between second permanent magnet and the piston, and permanent magnet can not cause magnetization to end cap and piston, can avoid the unnecessary ferrormagnetic substance material of its absorption.
Description of drawings
Fig. 1 is the structural representation of plain edition single-piston rod double-acting cylinder in the background technique;
Fig. 2 is the utility model embodiment one a structural representation;
Fig. 3 is the utility model embodiment two a structural representation;
Wherein: 1, piston; 2, cylinder body; 3, end cap; 4, first permanent magnet; 5, second permanent magnet; 6, first magnetic shield; 7, second magnetic shield.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further described:
Embodiment one: referring to shown in Figure 2, a kind of gas, oil hydraulic cylinder that has damping mechanism comprises piston 1, cylinder body 2 and is fixed on the rear end cover 3 on the cylinder body that the inboard of rear end cover 3 is installed with first magnetic shield 6, is embedded with annular first permanent magnet 4 in it.
Be installed with second magnetic shield 7 on the ear end face of said piston 1, be embedded with annular second permanent magnet 5 in it.
The front end of said first permanent magnet 4 is identical with the rear end polarity of second permanent magnet 5.
Pass through said structure; When the reciprocating motion of the pistons of gas, oil hydraulic cylinder when end face approaches the front-end face of rear end cover thereafter; Mutual repulsive force between first, second permanent magnet increases sharply; Thereby the motion to piston produces buffer-braking, and the movement velocity that reduces piston is to reach the purpose that reduces or eliminate impact.
Embodiment two: present embodiment two is between the front-end face of the front cover of gas, oil hydraulic cylinder and piston, having additional another set of magnetic buffer device on embodiment one the basis, and is as shown in Figure 3.

Claims (2)

1. gas, oil hydraulic cylinder that has damping mechanism; Comprise piston (1), cylinder body (2) and be fixed on the end cap (3) on the cylinder body; It is characterized in that: the inboard of said end cap (3) is installed with first permanent magnet (4); Be provided with second permanent magnet (5) with the relative piston end surface of this first permanent magnet (4), said first permanent magnet (4) is identical with the polarity of second permanent magnet (5) opposite end.
2. gas, the oil hydraulic cylinder that has damping mechanism according to claim 1; It is characterized in that: be provided with first magnetic shield (6) between said first permanent magnet (4) and the end cap (3), be provided with second magnetic shield (7) between said second permanent magnet (5) and the piston (1).
CN201220062820XU 2012-02-24 2012-02-24 Pneumatic/hydraulic cylinder with buffering mechanism Expired - Fee Related CN202441669U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201220062820XU CN202441669U (en) 2012-02-24 2012-02-24 Pneumatic/hydraulic cylinder with buffering mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201220062820XU CN202441669U (en) 2012-02-24 2012-02-24 Pneumatic/hydraulic cylinder with buffering mechanism

Publications (1)

Publication Number Publication Date
CN202441669U true CN202441669U (en) 2012-09-19

Family

ID=46823121

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201220062820XU Expired - Fee Related CN202441669U (en) 2012-02-24 2012-02-24 Pneumatic/hydraulic cylinder with buffering mechanism

Country Status (1)

Country Link
CN (1) CN202441669U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102536957A (en) * 2012-02-24 2012-07-04 苏州大学 Pneumatic/hydraulic cylinder with buffering mechanism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102536957A (en) * 2012-02-24 2012-07-04 苏州大学 Pneumatic/hydraulic cylinder with buffering mechanism

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Legal Events

Date Code Title Description
GR01 Patent grant
C14 Grant of patent or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20120919

Termination date: 20150224

EXPY Termination of patent right or utility model