CN101555801A

CN101555801A - Hydraulic prop piston

Info

Publication number: CN101555801A
Application number: CNA2009100962091A
Authority: CN
Inventors: 吴立坤
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-02-25
Filing date: 2009-02-25
Publication date: 2009-10-14

Abstract

The invention relates to a hydraulic prop piston which comprises a piston body and a Y-shaped sealing ring. A bulge is arranged on the inner side at the upper part of the Y-shaped sealing ring, the whole Y-shaped sealing ring is arranged in a caulking groove at the lower part of the piston body, and the bottom edge of the caulking groove is formed by the radial extending of the outer wall of the piston body. The piston body adopts a high molecular material full part; and a concave part with the shape matched with that of the bulge of the Y-shaped sealing ring is arranged on the top edge corresponding to the bottom edge of the caulking groove. The piston body is made by adopting high molecular material to replace metal material, therefore, problems such as a guide ring, an extrusion ring and a gasket and the like are not required to be considered, not only the components of the piston are reduced, and the production cost is reduced, but also the service life of the piston is prolonged, and the reliability is improved; even if prop blocking phenomenon occurs, the prop column can not be damaged; after the structure that the Y-shaped sealing ring is embedded with the concave part of the piston is adopted, not only the extrusion-proof ring is canceled, but also the pressing-receiving and anti-deformation capability of the Y-shaped sealing ring can be improved.

Description

Hydraulic prop piston

[technical field]

The present invention relates to a kind of hydraulic prop piston, especially belong to the piston structure of a kind of adapted on hydraulic pressure of the colliery supporting pillar.

[background technology]

Before the present invention makes, be installed in the piston structure on the supporting pillar, comprise the piston body that metal material is made, form several annular grooves after the footpath concaves on the piston body outer wall, as shown in Figure 1: have 1-2 sealed groove 21, guide ring groove 5 from top to bottom, guide ring groove 5 is located on the wall of piston body 2 evaginations.The upper cavity 23 of described piston body 2 evagination walls is used to admit backing member, and the y-type seal ring groove is formed at the bottom, and y-type seal ring 3 is embedded in this groove.Three trough rims of described y-type seal ring groove are the plane, for preventing that y-type seal ring 3 from producing distortion under pressured state, upper inner at y-type seal ring 3 has protuberance 31, and add the anti-extrusion ring 4 that nonmetals are made in the outside of protuberance 31, rely on 4 pairs of y-type seal rings 3 of anti-extrusion ring to do radial location, make y-type seal ring 3 indeformable as far as possible under pressured state.

The problem of technology existence now is: because piston body 2 adopts metal material to make, therefore, just must add the guide ring of making by macromolecular material, the packing ring and the anti-extrusion ring 4 of O RunddichtringO in piston body 2 and pillar column casing force part, directly contact friction with what avoid metal piston body 2 and metal column casing, not only parts are many, cost of manufacture is high thereby cause whole piston, and make reliability decrease; Y-type seal ring 3 relies on anti-extrusion rings 4 to do radial location, and this structure is through practice test, compressive deformation and to produce the phenomenon of leakage very serious, and the application life of y-type seal ring 3 is less than 1 year often; Moreover, if in use the hydraulic valve of control pillar work is malfunctioning, when " dead post " phenomenon occurring because of hydraulic pressure is excessive, will damage the pillar column casing.

[summary of the invention]

For solving the problems referred to above that prior art exists, the present invention aims to provide a kind of hydraulic prop piston, this piston has the advantage that assembling parts is few, cost of manufacture is low and reliability is high, with existing hydraulic pressure of the colliery supporting pillar adapted, also can not damage the pillar column casing even " dead post " phenomenon takes place.

For solving the problems of the technologies described above, the present invention has adopted following technical scheme: the structure of this hydraulic prop piston, comprise piston body, y-type seal ring, the upper inner of y-type seal ring has protuberance, whole y-type seal ring is arranged in the caulking groove of piston body bottom, the bottom land limit of caulking groove is that the piston body outer wall radially extends and forms, and it is characterized in that: described piston body is the macromolecular material single piece; On the corresponding groove top margin in the bottom land limit of described caulking groove, has the recess that a shape and described y-type seal ring protuberance are complementary.

Described macromolecular material single piece is nylon, polyformaldehyde, rigid polyvinyl chloride or High molecular weight polyethylene single piece.

Beneficial effect: piston body of the present invention macromolecular material alternative metals material, thereby no longer need to consider to be provided with guide ring, extruding circle and packing ring problem, both reduced piston element, reduced cost of production, also prolonged piston application life, improved reliability.Because the relative metal mainstay column casing of macromolecular material piston, hardness is softer, therefore, also can not damage the pillar column casing even " dead post " phenomenon takes place, and the effect that has is believed to be bound to receive praises from customers.After adopting y-type seal ring protuberance and piston body recess embedding structure mutually, not only can omit anti-extrusion ring, and can also improve pressurized resistance ability, the good reliability of y-type seal ring.Moreover, the macromolecular material piston body, it is strong to have a resistance to corrosion, is fit to the advantage of water as hydraulic fluid, has thoroughly solved metallic piston and need use emulsion as the environmental issue that hydraulic fluid brought, and use cost is low; Perhaps metallic piston selects for use water as hydraulic fluid after preservative treatment again, because of problems such as the environmental protection that preservative treatment brought such as plating, cost of manufacture height.

[description of drawings]

Fig. 1 is a prior art products sectional structure schematic diagram.

Fig. 2 is a product sectional structure schematic diagram of the present invention.

Among the figure: inner chamber 1, piston body 2, sealed groove 21, bottom bulge loop 22, cavity 23, y-type seal ring 3, protuberance 31, anti-extrusion ring 4, guide ring groove 5.

[specific embodiment]

Referring to accompanying drawing 2.Comprise the product of the present invention that piston body 2, y-type seal ring 3 constitutes, piston body 2 is made for macromolecular material, the single piece of making as nylon, polyformaldehyde, rigid polyvinyl chloride or High molecular weight polyethylene.The upper inner of y-type seal ring 3 has protuberance 31, and whole y-type seal ring 3 is arranged in the annular caulking groove of piston body 2 bottoms.The bottom land limit of caulking groove is that the outer wall of piston body 2 bottommosts radially extends and forms, and forms bottom bulge loop 22, and the inner plane of bottom bulge loop 22 is the bottom land limit; The piston body of not doing extension 2 outer walls that join with described bottom land limit and the inside wall of y-type seal ring 3 paste mutually.The recess that inboard shape of formation of the groove top margin of caulking groove and described y-type seal ring 3 protuberances 31 are complementary, be used to admit protuberance 31, the groove top margin outside of caulking groove constitutes whole with piston body 2, block the protuberance 31 of y-type seal ring 3, play and the similar effect of prior art anti-extrusion ring 4 (referring to Fig. 1), but because it and piston body 2 are single piece, in the motion relative displacement can not take place, therefore effect is obvious, the pressurized resistance to deformation of y-type seal ring 3 can be strengthened, application life, generally more than 2 years, antiseep was effective.

Because piston body 2 is single piece that macromolecular material is made, therefore, when the O RunddichtringO is arranged in the sealed groove 21, not only do not need to be provided with packing ring, and sealing effectiveness and better reliability.

Claims

1, a kind of hydraulic prop piston, comprise piston body (2), y-type seal ring (3), the upper inner of y-type seal ring (3) has protuberance (31), whole y-type seal ring (3) is arranged in the caulking groove of piston body (2) bottom, the bottom land limit of caulking groove is that piston body (2) outer wall radially extends and forms, and it is characterized in that: described piston body (2) is the macromolecular material single piece; On the corresponding groove top margin in the bottom land limit of described caulking groove, has the recess that a shape and described y-type seal ring (3) protuberance (31) are complementary.

2, hydraulic prop piston as claimed in claim 1 is characterized in that: described macromolecular material single piece is nylon, polyformaldehyde, rigid polyvinyl chloride or High molecular weight polyethylene single piece.