CN2088597U - Hydraulic jack sealing device for coal mine underground shaft - Google Patents
Hydraulic jack sealing device for coal mine underground shaft Download PDFInfo
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- CN2088597U CN2088597U CN 91202818 CN91202818U CN2088597U CN 2088597 U CN2088597 U CN 2088597U CN 91202818 CN91202818 CN 91202818 CN 91202818 U CN91202818 U CN 91202818U CN 2088597 U CN2088597 U CN 2088597U
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- seal groove
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Abstract
The utility model relates to a hydraulic jack sealing device for coal mine underground. A piston with an annular seal groove is arranged in the cylinder of the jack, the width of the seal groove can be regulated, an expandable seal ring is arranged in the seal groove, a support plate and a ribbed plate are arranged in the seal ring, and a through hole connected with the working chamber of the jack is arranged on the piston, which is used for introducing the high pressure liquid into the seal ring. The utility model can provide reliable high and low pressure seal and low initial motion resistance, adapt to the deformation of the cylinder, and reduce the machining precision of the manufacture of the cylinder.
Description
The utility model relates to a kind of underground mine use hydraulic jack sealing device, comprises the jack cylinder barrel, the piston of band shape seal groove etc.
A kind of hydraulic prop is disclosed in the 323rd page of " the external coal-face comprehensive mechanization equipment " that Coal Industry Press 1978 publishes, wherein introduced the hermetically-sealed construction of several employing different sealing circles, as adopting structures such as flower bud shape sealing ring, y-shaped ring, top shape sealing ring, shape wave sealing ring.This literary composition has also exemplified the defective of these several sealing rings simultaneously, easily sticks on sealed surface of relative motion as y-shaped ring, thereby fragile; As adopt two y-shaped rings, because the effect of hydraulic coupling easily pushes away sealing ring askew; Push up the shape sealing ring and adopt, then because the size of sealing ring itself is fixed, that is its rubber part size that outwards expands is constant, so this sealing ring can not adapt to the distortion of jack cylinder barrel, can not guarantee high pressure effectively, especially the low pressure seal performance.In addition, above-mentioned various sealing rings all require very high to the cylinder barrel processing dimension of jack, promptly not only need high machining accuracy but also require low surface roughness, and this not only causes processing difficulties, and directly influences the cost of product.Jack piston and the sealing device between the cylinder letter and the equal ubiquity the problems referred to above of the sealing device between piston rod and fairlead of being adopted in support apparatus under present coal mine and other equipment.
Adopted in the sealing device of expandable seal circle in the prior art, because inflatable Mi Quan is under the internal high pressure effect, produce intermolecular affinity between its sealed working face and the sealed metal covering, therefore at highly pressurised liquid from the sealing ring inner chamber after the removal, the work plane of sealing ring still tightly is bonded on the sealed metal covering because of the affinity of molecule.This will cause operating mechanism's action dumb, and defectives such as dull are arranged.This defective is support apparatus under coal mine---and can cause in the hydraulic prop that the pillar setting prop can not fall post later, or fall the post action and stay slow, dumb.Thereby cause the expandable seal circle in hydraulic prop, to use.
The purpose of this utility model is to provide a kind of sealing device that is suitable for jack sealing usefulness under the coal mine, the sealing device is providing reliable high pressure sealing performance, especially not only can adapt to the distortion of jack cylinder barrel the low pressure seal performance time, and have low initial motion resistance.
The utility model takes following measure to realize above-mentioned purpose:
A kind of underground mine use hydraulic jack sealing device, the piston that comprises cylinder barrel and band shape seal groove, be provided with expandable sealing ring in the piston seal groove, there is a width to equal the support ring of distance between joint ring cavity two inside walls in the expandable sealing ring cavity, have the liquid pass hole that runs through its thickness on the support ring, the contacted upward end face of joint ring and cylinder barrel is the cambered surface to cylinder barrel direction projection, in the expandable sealing ring cavity, be provided with the floor that is connected mutually with last end face and two side along the jack axis direction, have liquid pass hole on expandable sealing ring and the contacted bottom surface of piston seal groove bottom, this liquid pass hole communicates with the jack high pressure chest by the through hole on the piston.Annular seal groove sidewall is connected with piston by screw thread on the piston.The width of expandable sealing ring is greater than the width of annular seal groove on the piston.The sidewall of expandable sealing ring is stairstepping, is provided with the elastic reset ring at the stairstepping recess.Be provided with the fusiformis valve that expandable sealing ring internal cavities and two working chambers of jack alternately can be communicated in the through hole on the piston.
The utility model is owing to adopted expandable sealing ring, and the internal cavities of joint ring communicates with the jack working chamber, therefore after working chamber pressure raises, joint ring promptly expands thereupon, reliable high pressure sealing performance is provided thus, and along with the rising of pressure, it is reliable that sealing performance will further be tending towards.The utility model adopts the technical measures that support ring is set in expandable sealing ring, simultaneously seal groove is arranged to the seal groove of width-adjustable integral expression, therefore when the assembling jack, as long as suitably adjust the width of seal groove, can make the two side of seal groove clamp expandable sealing ring, and because support ring supports the expandable sealing ring cavity inner wall, therefore expandable sealing ring produces distortion under the extruding of groove side wall and support ring, end face is realized reliable, adjustable low pressure seal performance thus to jack cylinder barrel inwall projection on its arc.The utility model is by adopting the measure that floor is set and the elastic reset ring is set outside it in expandable sealing ring, make expandable sealing ring within it behind the chamber removal pressure, because the effect that floor and elastic reset ring recover its original state, the last end face of expandable sealing ring is produced in time be tending towards restorable distortion, this distortion will reduce the resistance of motion of piston widely, promptly reduce the initial motion resistance of piston.Because expandable sealing ring of the present utility model and elastic reset ring thereof are elastically deformables, thereby can make the nominal bore diameter of the nominal outside diameter of piston less than cylinder barrel, sealing is between the two provided by expandable sealing ring that can be out of shape under pressure and elastic reset ring, so not only can reduce requirement to the machining accuracy of cylinder barrel, and can deacclimatize the round of cylinder barrel by sealing device and be out of shape, thereby reduced the requirement to the material that is processed into cylinder barrel, this will reduce the cost of product effectively.
Below in conjunction with accompanying drawing the utility model is described in detail, wherein:
Fig. 1 represents to adopt the partial sectional view of passing jack (or column) of the underground mine use hydraulic support of the utility model sealing device;
Fig. 2 represents to adopt the partial sectional view of the underground mine use hydraulic prop of the utility model sealing device.
Referring to Fig. 1, wherein an end of piston rod 1 has the stairstepping convex shoulder, and the end of diameter minimum is an external screw thread, and piston 2 is sleeved on the piston rod 1 and is located by the convex shoulder of piston rod 1, and is fixed on the piston rod 1 by nut 4.Piston 2 and piston rod 1 are set in the cylinder barrel 3.Piston 2 itself is also stepped, and its minimum diameter end also is provided with external screw thread.The external diameter of side plate 5 is identical with the external diameter of piston 2, the internal thread of its endoporus for matching with the external screw thread of piston 2 ends.Therefore, can adjust width by rotation side plate 5 by the annular seal groove that boss constituted on side plate 5 and the piston 2.Expandable sealing ring 6 is installed in by in the annular seal groove that boss constituted on side plate 5 and the piston 2, in the present embodiment, the cross section of expandable sealing ring 6 caves in to its cross section axis of symmetry at the place, angle on two abreast at it, form two concave stations on the two side of joint ring 6, elastic reset ring 7 just is arranged in these two concave stations.Can find out clearly that from figure the last end face of expandable sealing ring 6 is the cambered surface to inner wall of cylinder direction projection, its cambered surface inboard is provided with floor 8, and floor 8 is provided with along the alternate equal distance of expandable sealing ring 6 internal cavities.Be provided with the support ring 10 of band liquid pass hole 9 below the floor 8.The width of support ring 10 equals the distance between expandable sealing ring 6 two side inwalls.Joint ring 6 itself also has liquid pass hole 11.Can clearly be seen that from figure the width of expandable sealing ring 6 is greater than the length of second section boss on the piston rod 1.Like this, when screwing nut 4, can the sidewall of Expansion sealing ring 6 be compressed, and then made joint ring 6 distortion, make its cambered surface, reliable low pressure seal is provided thus further to inner wall of cylinder direction projection.And the visual need of work of this low pressure seal performance gives flexible adjustment, can adopt known mode that nut 4 is locked after mixing up.
From Fig. 1, also can see, be provided with shoulder hole 12 with its axis on the piston 1 with paralleling, and and the perpendicular through hole 13 of its axis direction, fusiformis valve 14 is housed in the enlarged diameter section of shoulder hole 12.The back of fusiformis valve 14 is blocked with the screw plug 16 that has hole 15.When the feed liquor of jack piston chamber (i.e. chamber, left side among the figure), the through hole on fusiformis valve 14 shutoff piston right sides, pressure liquid enters through hole 13 from the hole in left side, enters the inner chamber of expandable sealing ring 6 then.Otherwise during from the right side feed liquor, the fusiformis valve is the left hole of shutoff piston 2 then, and pressure liquid still enters the inner chamber of joint ring 6.
Can be clear that also that from figure the external diameter of piston 2 is less than the internal diameter of cylinder barrel 3.Therefore, even the internal diameter of cylinder barrel is not round, or under action of hydraulic force distortion is arranged, piston 2 all can be free therein back and forth movable.Sealing is between the two then guaranteed by joint ring 6.
Figure 2 shows that the partial sectional view of the hydraulic prop that adopts the utility model sealing device.Its structure and structure shown in Figure 1 are basic identical, but because hydraulic prop is a single-acting formula jack, so elastic reset ring 7 only is set on expandable sealing ring 6 one.Owing to piston 18 in hydraulic prop is a hollow, the side plate 17 that therefore constitutes a sidewall of seal groove is connected with piston 18 by bolt 19 again, and the adjustment of initial sealing also realizes by adjusting bolt 19.
The elastic reset ring 7 shown in Fig. 1 and Fig. 2 not only can help expandable sealing ring 6 on end face break away from the inwall of cylinder barrel 3, and two angles that can prevent the last end face of joint ring 6 under high pressure are squeezed in the gap between piston 2 and the cylinder barrel 3, thereby prevent that joint ring 6 is destroyed.
Above embodiment is just to detailed description of the present utility model.As everyone knows, under principle of the present utility model, also various distressed structures can be arranged.Be turned on its endoporus as work plane the joint ring in the sealing device described in the utility model, can be with sealing device described in the utility model as reciprocating sealing place.In addition also can be according to the needs of different operating modes, at the seal groove of the utility model sealing device plural expandable sealing ring is set.
Claims (5)
1, a kind of underground mine use hydraulic jack sealing device, the piston that comprises cylinder barrel and band shape seal groove, it is characterized in that, be provided with expandable sealing ring in the piston seal groove, there is a width to equal the support ring of distance between joint ring cavity two inside walls in the expandable sealing ring cavity, have the liquid pass hole that runs through its thickness on the support ring, the contacted upward end face of joint ring and cylinder barrel is the cambered surface to cylinder barrel direction projection, in the expandable sealing ring cavity, be provided with the floor that is connected mutually with last end face and two side along the jack axis direction, have liquid pass hole on expandable sealing ring and the contacted bottom surface of piston seal groove bottom, this liquid pass hole communicates with the jack high pressure chest by the through hole on the piston.
2, sealing device as claimed in claim 1 is characterized in that, annular seal groove sidewall is connected with piston by screw thread on the piston.
3, sealing device as claimed in claim 2 is characterized in that, the width of expandable sealing ring is greater than the width of annular seal groove on the piston.
4, sealing device as claimed in claim 1 is characterized in that, the sidewall of expandable sealing ring is stairstepping, is provided with the elastic reset ring at the stairstepping recess.
5, sealing device as claimed in claim 1 is characterized in that, is provided with the fusiformis valve that expandable sealing ring internal cavities and two working chambers of jack alternately can be communicated in the through hole on the piston.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91202818 CN2088597U (en) | 1991-02-27 | 1991-02-27 | Hydraulic jack sealing device for coal mine underground shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91202818 CN2088597U (en) | 1991-02-27 | 1991-02-27 | Hydraulic jack sealing device for coal mine underground shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2088597U true CN2088597U (en) | 1991-11-13 |
Family
ID=4913276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91202818 Granted CN2088597U (en) | 1991-02-27 | 1991-02-27 | Hydraulic jack sealing device for coal mine underground shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2088597U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103362524A (en) * | 2013-08-03 | 2013-10-23 | 刘立起 | Drum type boosting multi-ring composite sealing handle body |
| WO2024040418A1 (en) * | 2022-08-23 | 2024-02-29 | 安翼机器人(江苏)有限公司 | Sealing system for crawler robot |
-
1991
- 1991-02-27 CN CN 91202818 patent/CN2088597U/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103362524A (en) * | 2013-08-03 | 2013-10-23 | 刘立起 | Drum type boosting multi-ring composite sealing handle body |
| CN103362524B (en) * | 2013-08-03 | 2015-06-10 | 刘立起 | Drum type boosting multi-ring composite sealing handle body |
| WO2024040418A1 (en) * | 2022-08-23 | 2024-02-29 | 安翼机器人(江苏)有限公司 | Sealing system for crawler robot |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| RN01 | Renewal of patent term | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |