CN201730896U - Engineering machine and hydraulic cylinder thereof - Google Patents
Engineering machine and hydraulic cylinder thereof Download PDFInfo
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- CN201730896U CN201730896U CN2010202987994U CN201020298799U CN201730896U CN 201730896 U CN201730896 U CN 201730896U CN 2010202987994 U CN2010202987994 U CN 2010202987994U CN 201020298799 U CN201020298799 U CN 201020298799U CN 201730896 U CN201730896 U CN 201730896U
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- pipeline
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- hydraulic jack
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Abstract
The utility model discloses a hydraulic cylinder which includes a cylinder tube (1) and a piston (2); the outer cylindrical surface of the piston (2) is provided with a sealing cavity (4); a seal ring (5) is arranged in the sealing cavity; an oil guide pipeline (3) is arranged in the piston; the oil guide pipeline (3) includes a first pipeline (31) and a second pipeline (32) communicated with the two sides of the piston (2); one end of the first pipeline (31) is communicated with the sealing cavity (4) and the other end of the first pipeline (31) is communicated with the middle part of the second pipeline (32); a plugging part is arranged in the second pipeline (32) and plugs any end of the second pipeline (32) under the push of hydraulic oil. In the hydraulic cylinder, the service life of the seal ring is prolonged and the communication of the oil guide pipelines at the two ends of the piston simultaneously is avoided when the sealing performance of the piston is improved. The utility model further discloses an engineering machine including the hydraulic cylinder.
Description
Technical field
The utility model relates to technical field of engineering machinery, particularly relates to a kind of hydraulic jack.In addition, the utility model also relates to a kind of engineering machinery that comprises this hydraulic jack.
Background technique
Hydraulic jack has now become application one of engineering mechanical components very widely.Because certainly exist the gap in the cylinder barrel of hydraulic jack and the piston, there is hydraulic difference again in two ends, hydraulic transmission intermediate gap, will inevitably cause the liquid leakage, cause energy loss.Therefore, the sealing of oil cylinder is the emphasis of engineering and technological research always.If can improve the sealability of oil cylinder, certainly will can increase its working life, improve the performance of product.
Comparatively traditional piston sealing structure mainly is a combined seal ring, and the elastic force by the rubber deformation of seal ring in the use makes seal ring be close to inner wall of cylinder, along with increase service time, and the rubber serious wear, elastic force reduces, and will cause sealing effect to lower.This structure is along with the working pressure of oil cylinder increases simultaneously, and sealing effect lowers.Oil cylinder as this structure is bigger in impact, and pressure is higher, and uses in the frequent environment that commutates, and lets out in being easy to generate, and system effectiveness reduces.
At above problem, available technology adopting the mode of compound motive sealing, as shown in Figure 1.The L shaped seal ring 102 that the cylindrical at piston 105 two ends is provided with O shape rubber seal 103 and is coated at O-ring seals 103 produces outside tension force behind O-ring seals 103 compressive deformations, press the cylindrical of L shaped seal ring 102 and casing wall are adjacent to.Meanwhile, on piston 105, also be provided with hydraulic oil pipeline 106 (being four pipelines in the sectional drawing of Fig. 1), on piston 105, be provided with cavity 108, expander circle 109 is installed in the cavity 108, piston 105 two ends are equipped with throttle valve 104 and the one-way valve 107 that communicates with corresponding hydraulic oil pipeline 106, during left side chamber oil-feed, pressure oil enters by throttle valve 104 and makes 109 distortion of expander circle in the cavity, thereby reduce the gap between expander circle 109 cylindricals and the cylinder wall, when the oil-feed of right chamber, left chamber pressure step-down, the pressure of left side cavity 108 is higher relatively, pressure oil can be arranged chamber left by left side one-way valve 107, reduces the pressure of left side cavity 108.The sealing of the type structure piston relies on the hydraulic oil pipeline to introduce pressure oil and acts on the seal ring, on seal ring, produce hydraulic coupling, the elastic force of instead of rubber, solved the problem of leaking because of the decay of rubber elasticity power in the conventional seals structure, this structure is along with the working pressure of oil cylinder increases simultaneously, the suffered hydraulic coupling of seal ring also increases, and sealing effect will further improve.Yet, when the expander circle is close to inner wall of cylinder under the active force of pressure oil, can cause both sides hydraulic oil pipeline to be ganged up.Because seal ring is done the stressed position that concentrates on hydraulic pressure cavity introducing pressure oil of time spent, particularly under the situation of high-pressure work, can make two places hydraulic pressure cavity position serious wear simultaneously, using effect descends.
Therefore, how when improving the piston seal performance, prolonging the working life of seal ring and avoiding the connection of piston both sides hydraulic oil pipeline is the present technical issues that need to address of those skilled in the art.
The model utility content
The purpose of this utility model provides a kind of hydraulic jack, this hydraulic jack when improving the piston seal performance, the connection that has prolonged the working life of seal ring and avoided the piston both sides to draw oil-piping.Another purpose of the utility model is for providing a kind of engineering machinery that comprises this hydraulic jack.
For solving the problems of the technologies described above, the utility model provides a kind of hydraulic jack, comprises cylinder barrel and piston, and the external cylindrical surface of described piston is provided with Seal cage, is provided with seal ring in the described Seal cage; Be provided with in the described piston and draw oil-piping, describedly draw second pipeline that oil-piping comprises first pipeline and is communicated with the both sides of described piston; One end of described first pipeline is communicated with described Seal cage, and the other end is communicated in the middle part of described second pipeline; Be provided with plugging part in described second pipeline, arbitrary end of described plugging part described second pipeline of shutoff under the promotion of hydraulic oil.
Preferably, described plugging part is a ball, and the external diameter of described ball is greater than the internal diameter of described first pipeline, and the described second pipe ends port is sealed and matched when contacting with described ball.
Preferably, the two ends of described second pipeline are communicated with the drainage plug screw, and the afterbody of described drainage plug screw is the circular cone end face.
Preferably, the bore of the two ends port of described second pipeline is less than the diameter of described ball.
Preferably, the quantity of described seal ring (5) is two, and the two keeps at a certain distance away and is symmetrical arranged; Described first pipeline is communicated with the Seal cage between the two described seal rings.
Preferably, the relative side of two described seal rings is equipped with opening.
Preferably, described opening is the lip opening.
Preferably, described Seal cage is arranged at the intermediate portion of described outside piston cylinder.
Preferably, the described number that draws oil-piping is more than one.
In addition, for realizing above-mentioned model utility purpose, the utility model also provides a kind of engineering machinery, and this project machinery comprises above-mentioned each described hydraulic jack.
Hydraulic jack provided by the utility model, the external cylindrical surface of its piston is provided with Seal cage, described seal ring places described Seal cage, is provided with in the described piston and draws oil-piping, describedly draws second pipeline that oil-piping comprises first pipeline and is communicated with the both sides of described piston; One end of described first pipeline is communicated with described Seal cage, and the other end is communicated in the middle part of described second pipeline; Be provided with plugging part in described second pipeline, arbitrary end of described plugging part described second pipeline of shutoff under the promotion of hydraulic oil.By the described oil-piping that draws pressure oil is introduced described Seal cage, described seal ring is produced pressure, make it be adjacent to casing wall more, further improve sealing.And described second ducted plugging part the two ends of described second pipeline are not communicated with, thereby can not cause the connection of piston two side cavity, can not influence the motion of piston.
In a kind of embodiment, preferably, described plugging part is a ball, and the external diameter of described ball is greater than the internal diameter of described first pipeline, and the two ends of described second pipeline are communicated with the drainage plug screw, and the afterbody of described drainage plug screw is the circular cone end face.Described ball will match with the circular cone end face afterbody of described drainage plug screw when being rolled into arbitrary end of described second pipeline, plays the effect of sealing.Roll structure is simple, and is easy to process.
In another kind of embodiment, keep at a certain distance away in the described Seal cage and be symmetrical arranged a pair of seal ring, described first pipeline is communicated with the Seal cage between the described seal ring, therefore the pressure oil that enters described first pipeline can act on described two seal rings simultaneously, and the inefficacy of arbitrary seal ring can not influence the work of another one seal ring.
In another kind of embodiment, the relative side of two described seal rings is equipped with the lip opening.The lip opening shape makes seal ring axial and radially all stressed, is adjacent to casing wall and piston, avoids the stressed position that concentrates on introducing pressure oil of seal ring, thereby further improves sealing, and reduce the wearing and tearing of seal ring.
Description of drawings
Fig. 1 is the compound movable sealing structure schematic representation of ultrahigh pressure rocker arm;
Fig. 2 is the oil hydraulic cylinder schematic representation of a kind of embodiment that the utility model provides;
Fig. 3 is the partial enlarged drawing at A position among Fig. 2.
Embodiment
Core of the present utility model provides a kind of hydraulic jack, this hydraulic jack when improving the piston seal performance, the connection that has prolonged the working life of seal ring and avoided the piston both sides to draw oil-piping.Another core of the utility model is for providing a kind of engineering machinery that comprises this hydraulic jack.
In order to make those skilled in the art person understand the utility model scheme better, the utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Please refer to Fig. 2, Fig. 2 is the oil hydraulic cylinder schematic representation of a kind of embodiment that the utility model provides, and Fig. 3 is the partial enlarged drawing at A position among Fig. 2.
In a kind of embodiment; hydraulic jack provided by the utility model; comprise cylinder barrel 1 and piston 2; be provided with seal ring 5 between piston 2 and the cylinder barrel 1; usually also be provided with guide collar 9 and antifouling ring 10; the external cylindrical surface of piston 2 is provided with Seal cage 4, and seal ring 5 places Seal cage 4 (the Seal cage number of present embodiment is, but is not limited to).Be provided with in the piston 2 and draw oil-piping 3, draw second pipeline 32 that oil-piping 3 comprises first pipeline 31 and is communicated with the both sides of piston 2; One end communication seals chamber 4 of first pipeline 31, the other end is communicated in the middle part of second pipeline 32, and described middle part is not limited to the position, middle of second pipeline 32, does not get final product so long as first pipeline 31 is not connected with the two ends of second pipeline 32.At this moment, drawing oil-piping 3 is three-port structures, and the inner cavity of cylinder of piston 2 both sides is communicated with by second pipeline 32.The working principle of hydraulic jack mainly is to make piston two side cavity produce pressure difference, piston is reciprocating under the effect of pressure difference, if piston two side cavity communicate, obviously can influence the formation of pressure difference, hinder the motion of piston, therefore in second pipeline 32, also plugging part will be set.Can block arbitrary end of second pipeline 32 under the promotion of the pressure oil of plugging part in entering second pipeline 32.The shutoff of plugging part is a dynamic process.Oil cylinder in telescopic process, pressure oil turnover direction alternate, the be stressed action direction of oil of plugging part also changes thereupon, and then an end opposite with the oil-feed direction in shutoff second pipeline 32 dynamically, therefore, the two ends of second pipeline 32 can not communicate.
When oil cylinder need stretch out left, the right chamber 12 of cylinder barrel 1 entered pressure oil, and pressure oil enters second pipeline 32 by the right output port of second pipeline 32, and its left port is sealed up by plugging part under the promotion of pressure oil, and pressure oil can not enter left chamber 11.Pressure oil can enter first pipeline 31, flows into Seal cage 4 again, and pressure oil produces pressure to the seal ring in the Seal cage 45, makes its inwall of being close to cylinder barrel 1, forms motive sealing, further improves sealing.When oil cylinder need be withdrawn to the right, left chamber's 11 oil-feeds, working principle coexists mutually, and this does not give unnecessary details.
The hydraulic coupling of introducing in the Seal cage 4 in this structure is the working oil pressure of oil cylinder, when the oil cylinder working pressure increases, the power of action of hydraulic force on seal ring 5 also increases, sealing intensity increases thereupon, and threeway is simultaneously drawn oil-piping and the arrangement that plugging part combines and avoided cylinder barrel 1 left and right sides chamber can be by drawing the drawback that oil-piping communicates.
In a kind of embodiment, plugging part can be made into ball 8 (for example steel ball), the external diameter of ball 8 guarantees that greater than the internal diameter of first pipeline 31 ball 8 can not enter first pipeline 31 when rolling in second pipeline 32.The diameter of ball 8 preferably equals or is slightly less than the diameter of second pipeline 32, guarantees that pressure oil does not have oil leakage in the process that promotes ball 8.When ball 8 was rolled into the right output port of second pipeline 32 or left port, two ports all were sealed and matched with ball, prevent the connection of two side cavity.
For being sealed and matched of the right output port that makes second pipeline 32 or left port and ball 8, the two-port of second pipeline 32 can be communicated with drainage plug screw 6 and drainage plug screw 7.The afterbody (i.e. the position that is communicated with second pipeline 32) of drainage plug screw 6 and drainage plug screw 7 is processed into the circular cone end face, and when ball 8 was rolled into left port or right output port, ball 8 and drainage plug screw 6 or the circular cone end face that draws whelk plug 7 were adjacent to sealing just.
The left port and the right output port of second pipeline 32 can also be processed into the structure of bore less than ball 8 diameters, the cooperation of ball 8 and two more small-bore ports can be played the effect of sealing equally.
Roll structure is simple, and installation and processing is convenient, and the function of realization shutoff that can be very easy is avoided the connection of two side cavity.
Certainly, except roll structure, can also use the cylindrical structure coaxial with second pipeline 32, two ports of second pipeline 32 can fixedly have the enclosing cover of hole, and the diameter of hole can be realized dynamic plugging action equally less than cylindrical diameter.The sectional shape of second pipeline 32 also is not limited to circle, can also be square or oval, and the sectional shape of plugging part can be suitable with it.Consider that plugging part moves and should possess certain flexibility, the pipeline of circular cross-section and ball are more suitable.
In another kind of embodiment, keeping at a certain distance away in the Seal cage 4 is symmetrical arranged a pair of seal ring, the Seal cage that first seal ring 51 as shown in Figure 2 and second seal ring, 52, the first pipelines 31 are communicated with between two seal rings.The Seal cage 4 at two seal ring places links to each other with same pipeline, no matter pressure oil enters (promptly no matter hydraulic jack stretches out still indentation) from which port of second pipeline 32, all can be under pressure the simultaneously pressure effect of oil of two seal rings is adjacent to the inwall of cylinder barrel 1, improves sealing.The damage of arbitrary seal ring simultaneously also can not influence the sealing function of another one seal ring.
Two seal rings are worked together and have been reduced wearing and tearing and do not disturb mutually, work simultaneously in the hydraulic jack telescopic process.In addition, two seal rings place a chamber also to save the space, have reduced the processing cost of piston.
Can on first seal ring 51 side relative, opening be set with second seal ring 52, pressure oil enters opening by first pipeline 31 between two openings, two seal ring pressures can be able to suitable dispersion, avoid the stressed position of introducing pressure oil that concentrates on, improve using effect, reduce wear.
As shown in Figure 3, the opening on two seal rings can be processed as the lip opening.After pressure oil enters the lip opening, all produce pressure at the opening upper and lower sides, upper and lower sides is the inclined-plane, produce component axial and radially, therefore its axially and radial force even, i.e. the end face of two seal rings and the cylndrical surface oily effect that all can be stressed not only is adjacent to it with the inwall of cylinder barrel 1, also be adjacent to piston 2, sealing effect is better.
Draw oil-piping 6 more than one can being provided with on the piston 2, accelerate the speed that pressure oil enters whole Seal cage 4, make dynamic sealing performance sensitive more, and arbitrary damage of drawing oil-piping can not influence the work that other draw oil-piping, the continuous firing of assurance sealing system.
In addition, the utility model also provides a kind of engineering machinery, and this project machinery comprises the hydraulic jack among above-mentioned any embodiment; Other parts of this project machinery can be with reference to prior art, and this paper no longer launches.
More than engineering machinery provided by the utility model and hydraulic jack thereof are described in detail.Used specific case herein principle of the present utility model and mode of execution are set forth, above embodiment's explanation just is used for helping to understand method of the present utility model and core concept thereof.Should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle, can also carry out some improvement and modification to the utility model, these improvement and modification also fall in the protection domain of the utility model claim.
Claims (10)
1. a hydraulic jack comprises cylinder barrel (1) and piston (2), and the external cylindrical surface of described piston (2) is provided with Seal cage (4), is provided with seal ring (5) in the described Seal cage (4); Be provided with in the described piston (2) and draw oil-piping (3), it is characterized in that, describedly draw second pipeline (32) that oil-piping (3) comprises first pipeline (31) and is communicated with the both sides of described piston (2); One end of described first pipeline (31) is communicated with described Seal cage (4), and the other end is communicated in the middle part of described second pipeline (32); Be provided with plugging part in described second pipeline (32), arbitrary end of described second pipeline of described plugging part shutoff under the promotion of hydraulic oil (32).
2. according to the described hydraulic jack of claim 1, it is characterized in that, described plugging part is ball (8), and the external diameter of described ball (8) is greater than the internal diameter of described first pipeline (31), and described second pipeline (32) two ends port is sealed and matched when contacting with described ball (8).
3. according to the described hydraulic jack of claim 2, it is characterized in that the two ends of described second pipeline (32) are communicated with the drainage plug screw, the afterbody of described drainage plug screw is the circular cone end face.
4. according to the described hydraulic jack of claim 2, it is characterized in that the bore of the two ends port of described second pipeline (32) is less than the diameter of described ball (8).
5. according to the described hydraulic jack of claim 1, it is characterized in that the quantity of described seal ring (5) is two, and the two keeps at a certain distance away and is symmetrical arranged; Described first pipeline (31) is communicated with the Seal cage between the two described seal rings (5).
6. according to the described hydraulic jack of claim 5, it is characterized in that the relative side of two described seal rings (5) is equipped with opening.
7. according to the described hydraulic jack of claim 6, it is characterized in that described opening is the lip opening.
8. according to the described hydraulic jack of claim 1, it is characterized in that described Seal cage (4) is arranged at the intermediate portion of described piston (2) external cylindrical surface.
9. according to the described hydraulic jack of claim 1, it is characterized in that the described number that draws oil-piping (3) is at least one.
10. an engineering machinery is characterized in that, comprises as each described hydraulic jack of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202987994U CN201730896U (en) | 2010-08-18 | 2010-08-18 | Engineering machine and hydraulic cylinder thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202987994U CN201730896U (en) | 2010-08-18 | 2010-08-18 | Engineering machine and hydraulic cylinder thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201730896U true CN201730896U (en) | 2011-02-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202987994U Expired - Fee Related CN201730896U (en) | 2010-08-18 | 2010-08-18 | Engineering machine and hydraulic cylinder thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201730896U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705297A (en) * | 2012-06-27 | 2012-10-03 | 三一重工股份有限公司 | Piston body and hydraulic cylinder |
| CN109281890A (en) * | 2018-11-09 | 2019-01-29 | 湖南师范大学 | A kind of hydraulic cylinder combined sealing structure and hydraulic cylinder |
-
2010
- 2010-08-18 CN CN2010202987994U patent/CN201730896U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705297A (en) * | 2012-06-27 | 2012-10-03 | 三一重工股份有限公司 | Piston body and hydraulic cylinder |
| CN102705297B (en) * | 2012-06-27 | 2015-01-14 | 三一重工股份有限公司 | Piston body and hydraulic cylinder |
| CN109281890A (en) * | 2018-11-09 | 2019-01-29 | 湖南师范大学 | A kind of hydraulic cylinder combined sealing structure and hydraulic cylinder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SANY AUTOMOBILE MANUFACTURING CO., LTD. Free format text: FORMER OWNER: SANYI HEAVY INDUSTRY CO LTD Effective date: 20130506 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130506 Address after: 410100 Changsha economic and Technological Development Zone, Hunan City, the 31 industrial city Patentee after: SANY Automobile Manufacturing Co., Ltd. Address before: 410100 Changsha economic and Technological Development Zone, Hunan City, the 31 industrial city Patentee before: Sanyi Heavy Industry Co., Ltd. |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110202 Termination date: 20130818 |