CN201368088Y - Double-stage constant-thrust oil cylinder - Google Patents
Double-stage constant-thrust oil cylinder Download PDFInfo
- Publication number
- CN201368088Y CN201368088Y CNU2009200184476U CN200920018447U CN201368088Y CN 201368088 Y CN201368088 Y CN 201368088Y CN U2009200184476 U CNU2009200184476 U CN U2009200184476U CN 200920018447 U CN200920018447 U CN 200920018447U CN 201368088 Y CN201368088 Y CN 201368088Y
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- piston
- big
- small
- end cap
- oil cylinder
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Abstract
The utility model provides the technical proposal of a double-stage constant-thrust oil cylinder. The technical proposal is as follows: the end parts of a big piston and a small piston of the double-stage constant-thrust oil cylinder are provided with end covers and non-metal supports, and step seals are arranged in the middle of inner walls of the end covers of the big piston and the small piston. After the big piston and the small piston are improved, the influence of side force can be reduced to the utmost extent when in movement, and the sealing effect is greatly improved simultaneously.
Description
Technical field:
The utility model relates to a kind of mining machinery hydraulic gate oil cylinder, especially a kind of push action cylinders such as twin-stage that end cap and nonmetal support are housed.
Background technique:
In the prior art, technique known is the push action cylinders such as twin-stage that the mining machinery hydraulic gate is used, the driving mechanism of hydraulic gate adopts oil cylinder to advance, owing to be subjected to the restriction of size in the down-hole, need reduce the axial dimension of each part, again because hydraulic gate work the time needs constant thrust, thereby push action cylinder such as twin-stage has appearred.Push action cylinders such as above-mentioned twin-stage, the end of big piston and small piston all is directly to add seal ring at cylindrical, directly contact with the inwall of cylinder body and big piston, because the inwall gap of big or small outside piston and cylinder body and big piston is very big, big small piston can be subjected to lateral force when motion influence produces radial deflection, badly influence the sealing effect of oil cylinder, produce problems such as leakage of oil, and influence the working life of oil cylinder.This is the existing in prior technology deficiency.
Summary of the invention:
The purpose of this utility model, be exactly at the existing in prior technology deficiency, and provide the technological scheme of push action cylinders such as a kind of twin-stage, this scheme has been installed end cap and nonmetal support at the big or small pistons end of push action cylinders such as twin-stage, is provided with this special envelope in the middle of the end cap inwall of big piston and small piston.Improve the big small piston in back reduces to be subjected to lateral force to greatest extent when motion influence, improved sealing effect simultaneously greatly.
This programme is realized by following technical measures: the push action cylinders such as twin-stage of end cap and nonmetal support are housed, mainly are made up of cylinder body, big piston, small piston, end cap, nonmetal support, this special envelope, Sealing etc.The characteristics of this programme are: piston rod seal is at the big or small pistons end of oil cylinder end cap to be installed, and Sealing and nonmetal support are installed in this end cap.Other concrete characteristics of this programme also have: what the Sealing in the end cap of big piston and small piston adopted is this special envelope.
The beneficial effect of this programme can be learnt according to the narration to such scheme, owing at the big or small pistons end of push action cylinders such as twin-stage end cap and nonmetal support have been installed in this scheme, is provided with this special envelope in the middle of the end cap inwall of big piston and small piston.Improve the big small piston in back reduces to be subjected to lateral force to greatest extent when motion influence, improved sealing effect simultaneously greatly.This shows that the utility model compared with prior art has substantive distinguishing features and progress, the beneficial effect of its enforcement also is conspicuous.
Description of drawings:
Accompanying drawing is the sectional structure schematic representation of the utility model embodiment.
Among the figure, 1 is small piston, and 2 is big piston, and 3 is cylinder body, 4 is the small piston ante-chamber, and 5 is the big piston end cap, and 6 is the duct, 7 is the duct, and 8 is one-way valve, and 9 is seal ring, 10 is the duct, and 11 is seal ring, and 12 back cavities are, 13 is the big piston ante-chamber, and 14 is the nonmetal support of big piston, and 15 is this special envelope of big piston, 16 is the nonmetal support of small piston, and 17 is this special envelope of small piston, and 18 is the small piston end cap.
Embodiment:
For clearly demonstrating the technical characterstic of this programme,, and, this programme is set forth in conjunction with its accompanying drawing below by an embodiment.
By accompanying drawing as can be seen, the push action cylinders such as twin-stage that end cap and nonmetal support are housed of this programme mainly are made up of interior outer cylinder body, big small piston, end cap, nonmetal support, this special envelope, Sealing etc.There is duct 6,7 small piston rod 1 inside, and their end is drawn from the small piston rod end, and wherein the other end in duct 6 passes to piston back cavity 12, and the other end in duct 7 passes to piston ante-chamber 4, and extends to small piston head one side by an one-way valve 8.The duct 10 that its ante-chamber 13 of one connection and back cavity 12 are arranged in the big piston 2.During work, the duct 6 logical pressure oils of small piston rod 1 inside, duct 7 logical oil returns, small piston duct 4 links to each other with duct 7, and back cavity 12 links to each other with duct 6, as a fixing end of small piston 1, then because pressure at both sides official post big piston 2 stretches out, when stretching the hole 10 on it outside the big piston 2, big piston ante-chamber 11 communicates with back cavity 12, they all are pressure oil, at this moment owing to the bi-side product moment, oil cylinder 3 is protruding, until total travel, big piston 2 continues to stretch out afterwards, till all stretching out.When rollback, the duct 6 logical oil returns of small piston rod 1 inside, duct 7 logical pressure oils, pressure oil enters small piston ante-chamber 4, and back cavity 12 is return pressure when communicating with duct 6, therefore big piston 2 bounces back, when duct on duct 7 and the big piston 10 was relative, pressure oil entered duct 10 through one-way valve 8 and links to each other with big piston ante-chamber 13, so ante-chamber 13 oil pressure are higher than back cavity 12, big piston left side pressure occurs greater than right atrial pressure, make outer shell 3 retractions.To the push action cylinders such as twin-stage of end cap and nonmetal support are housed, need to install end cap 5,18 and nonmetal support 14,16, end cap 5,18 cylindricals are connected by fine thread with the inwall of cylinder body 3 and big piston 2, the outer rounded ends of end cap 5,18 is placed O shape circle and is sealed, and the inwall of end cap 5,18 is placed nonmetal support 14,16 and 15,17 sealings of Si Te envelope.The purpose of placing nonmetal support is further to reduce the lateral force that piston rod 1,2 is subjected to, and the processing technology of piston rod also needn't be too complicated simultaneously.The Si Te envelope can play good sealing effect in the piston rod movement process.
Claims (2)
1. push action cylinders such as twin-stage, include cylinder body, big piston, small piston, piston rod seal etc., it is characterized in that: described piston rod seal is at the big or small pistons end of oil cylinder end cap to be installed, and Sealing and nonmetal support are installed in this end cap.
2. push action cylinder such as a kind of twin-stage according to claim 1, it is characterized in that: what the Sealing in the end cap of big piston and small piston adopted is this special envelope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200184476U CN201368088Y (en) | 2009-01-19 | 2009-01-19 | Double-stage constant-thrust oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200184476U CN201368088Y (en) | 2009-01-19 | 2009-01-19 | Double-stage constant-thrust oil cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201368088Y true CN201368088Y (en) | 2009-12-23 |
Family
ID=41486981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009200184476U Expired - Fee Related CN201368088Y (en) | 2009-01-19 | 2009-01-19 | Double-stage constant-thrust oil cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201368088Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102401134A (en) * | 2011-07-12 | 2012-04-04 | 四川成都成工工程机械股份有限公司 | Wet brake with step sealing structure |
| CN102758752A (en) * | 2011-04-26 | 2012-10-31 | 无锡市汉力士液压泵制品有限公司 | Displacement control mechanism for plunger pump |
| CN103573748A (en) * | 2013-09-30 | 2014-02-12 | 德州市佳欣液压有限公司 | Dual-function large-tonnage mechanical lock hydraulic cylinder |
-
2009
- 2009-01-19 CN CNU2009200184476U patent/CN201368088Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102758752A (en) * | 2011-04-26 | 2012-10-31 | 无锡市汉力士液压泵制品有限公司 | Displacement control mechanism for plunger pump |
| CN102401134A (en) * | 2011-07-12 | 2012-04-04 | 四川成都成工工程机械股份有限公司 | Wet brake with step sealing structure |
| CN103573748A (en) * | 2013-09-30 | 2014-02-12 | 德州市佳欣液压有限公司 | Dual-function large-tonnage mechanical lock hydraulic cylinder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091223 Termination date: 20130119 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |