CN202327074U - Piston sealing piece - Google Patents
Piston sealing piece Download PDFInfo
- Publication number
- CN202327074U CN202327074U CN201120430372XU CN201120430372U CN202327074U CN 202327074 U CN202327074 U CN 202327074U CN 201120430372X U CN201120430372X U CN 201120430372XU CN 201120430372 U CN201120430372 U CN 201120430372U CN 202327074 U CN202327074 U CN 202327074U
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- Prior art keywords
- polyurethane material
- piston
- sealing piece
- model
- utility
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- Expired - Lifetime
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Abstract
The utility model relates to the technical field of hydraulic and pneumatic seals, in particular to a piston sealing piece. The piston sealing piece is applied to a hydraulic cylinder and arranged on an annular groove on the side of a piston, and comprises a sealing piece body which is made of a hard polyurethane material and a sealing part which is arranged on the sealing piece body and made of a soft polyurethane material. Compared with the prior art, the utility model has the advantages that: the annular body of the piston sealing piece is made of the hard polyurethane material, and the sealing part is made of the soft polyurethane material, so that the piston sealing piece has a simple structure, can meet the requirement on low friction of the sealing part and the requirement on high extrusion resistance of the annular body at the same time, and completely meet the requirement of a practical working condition.
Description
Technical field
The utility model relates to hydraulic pressure, pneumostop technical field, particularly a kind of piston seal.
Background technique
The piston seal of existing oil hydraulic cylinder is varied, totally is divided into two types: the first kind is to adopt soft polyurethane material to process, and its advantage is that surface friction drag is little, but anti-extrusion performance is poor; Second type is to adopt hard polyurethane material to process, and its advantage is that anti-plasticating capacity is strong, but surface friction drag is bigger.
The model utility content
The utility model purpose is to provide a kind of piston seal; The existing piston Sealing adopts soft polyurethane material to process in the existing technology to solve; There is the defective of anti-extrusion performance difference, and adopts hard polyurethane material to process, have the technical matters of the bigger defective of surface friction drag.
The utility model purpose realizes through following technological scheme:
A kind of piston seal is applied in the oil hydraulic cylinder, is arranged on the annular groove of piston side, comprises the seal body of being processed by hard polyurethane material and is arranged on the sealed member that the polyurethane material by soft on the said seal body is processed.
Preferably, said hard polyurethane material comprises thermoplastic polyurethane, and its hardness is 75ShA～55ShD.
Preferably, said soft polyurethane material comprises thermoplastic polyurethane, and its hardness is 70～93ShA.
Preferably, said seal body comprises annular solid, and said annular solid is close in the annular groove of piston.
Preferably, said sealed member comprises sealed department, and said sealed department is arranged on the top of said annular solid, and the part of said sealed department is stretched out said annular groove.
Compared with prior art; The annular solid of the piston seal of the utility model adopts hard polyurethane material; And sealed department adopts soft polyurethane material; It is not only simple in structure, can also satisfy simultaneously to the requirement of the low friction of sealed department with to the requirement of the strong anti-plasticating capacity of annular solid, meets actual working condition requirement fully.
Description of drawings
Fig. 1 is the structural change sectional view of the piston seal of the utility model in working process;
Fig. 2 is the structural representation of the piston seal rip cutting of the utility model;
Fig. 3 is the structural representation of the piston seal of the utility model;
Fig. 4 is installed in the sectional view in the oil hydraulic cylinder for the piston seal of the utility model.
Embodiment
Below in conjunction with accompanying drawing, specify the utility model.
See also Fig. 4; The piston seal of the utility model; Be applied to be arranged on the annular groove of piston 3 sides in the oil hydraulic cylinder 4, comprise seal body and be arranged on the sealed member on the seal body; The material of seal body adopts hard polyurethane material, and the material of sealed member adopts soft polyurethane material.Hard polyurethane material comprises thermoplastic polyurethane, and its hardness is 75ShA～55ShD.Soft polyurethane material comprises thermoplastic polyurethane, and its hardness is 70～93ShA.
See also Fig. 2,3, seal body comprises annular solid 11, and annular solid 11 is close in the annular groove of piston.Sealed member comprises sealed department 21, and sealed department 21 is arranged on the top of annular solid 11, and the part of sealed department 21 is stretched out annular groove.
See also Fig. 1, the preparation process of the piston seal of the utility model may further comprise the steps:
1) in mould, is injection molded into first Sealing, 1, the first Sealing with hard polyurethane material and comprises annular solid 11 and the sealed department 12 that is connected annular solid top.Wherein, hard polyurethane material comprises thermoplastic polyurethane, and its hardness is 75ShA～55ShD.
Specific operation are following:
Fusing: but the solid feed of thermoplastic polyurethane is fused into the fluid state of injection moulding, and melting point is 180～250 ℃;
Matched moulds: matched moulds adopts high-voltage lock mould to zero-bit;
Injection: after matched moulds puts in place, the thermoplastic polyurethane of start injection fluid state, injection pressure 10～13MPa, time 2～4s;
Pressurize: dwell pressure 5～9MPa, time 3～6s;
Cooling: cooling 15～25s, product is fully cooled off, be convenient to take out;
Die sinking: active and inactive mold separates, and product is followed dynamic model one side;
The demoulding: product ejects, and can make first Sealing 1.
2) sealed department 12 with first Sealing of processing in the step 1) 1 cuts away, and only keeps annular solid 11.
Specific operation are following:
With trimmer and anchor clamps first Sealing of molding and forming is cut into and only keeps annular solid, the height of annular solid is 30～50% of the first Sealing total height.The speed regulation of trimmer is unsuitable too fast or slow excessively, and the general cutting time guarantees that at 3～5s the plane that cuts is more straight.
3) annular solid is put into the mould of step 1); In said mould, be injection molded into second Sealing 2 with soft polyurethane material; Second Sealing 2 comprises the annular solid 11 that is injection molded into hard polyurethane material and with the sealed department 21 that soft polyurethane material is injection molded into, get final product product.Wherein, soft polyurethane material comprises thermoplastic polyurethane, and its hardness is 70～93ShA.
Specific operation are following:
Fusing: but the solid feed of thermoplastic polyurethane is fused into the fluid state of injection moulding, and melting point is 180～250 ℃;
Matched moulds: matched moulds adopts high-voltage lock mould to zero-bit;
Injection: after matched moulds puts in place, the thermoplastic polyurethane of start injection fluid state, injection pressure 10～13MPa, time 2～4s;
Pressurize: dwell pressure 5～9MPa, time 3～6s;
Cooling: cooling 15～25s, product is fully cooled off, be convenient to take out;
Die sinking: active and inactive mold separates, and product is followed dynamic model one side;
The demoulding: product ejects, and can make the piston seal of the utility model.
The annular solid of the piston seal of the utility model adopts hard polyurethane material; And sealed department adopts soft polyurethane material; It is not only simple in structure; Can also satisfy simultaneously to the requirement of the low friction of sealed department with to the requirement of the strong anti-plasticating capacity of annular solid, meet actual working condition requirement fully.
More than the disclosed several specific embodiments that are merely the application, but the application is not limited thereto, any those skilled in the art can think variation, all should drop in the application's the protection domain.
Claims (5)
1. piston seal; Be applied in the oil hydraulic cylinder; Be arranged on the annular groove of piston side, it is characterized in that, comprise the seal body of processing by hard polyurethane material and be arranged on the sealed member that the polyurethane material by soft on the said seal body is processed.
2. a kind of piston seal as claimed in claim 1 is characterized in that, said hard polyurethane material comprises thermoplastic polyurethane, and its hardness is 75ShA ~ 55ShD.
3. a kind of piston seal as claimed in claim 1 is characterized in that, said soft polyurethane material comprises thermoplastic polyurethane, and its hardness is 70 ~ 93ShA.
4. a kind of piston seal as claimed in claim 1 is characterized in that said seal body comprises annular solid, and said annular solid is close in the annular groove of piston.
5. a kind of piston seal as claimed in claim 4 is characterized in that said sealed member comprises sealed department, and said sealed department is arranged on the top of said annular solid, and the part of said sealed department is stretched out said annular groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120430372XU CN202327074U (en) | 2011-11-03 | 2011-11-03 | Piston sealing piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120430372XU CN202327074U (en) | 2011-11-03 | 2011-11-03 | Piston sealing piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202327074U true CN202327074U (en) | 2012-07-11 |
Family
ID=46439053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120430372XU Expired - Lifetime CN202327074U (en) | 2011-11-03 | 2011-11-03 | Piston sealing piece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202327074U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102506170A (en) * | 2011-11-03 | 2012-06-20 | 上海唯万密封科技有限公司 | Piston sealing piece manufacturing process and piston sealing piece |
| US9664282B2 (en) | 2013-08-20 | 2017-05-30 | Dow Global Technologies Llc | Polyurethane elastomeric seal for hydraulic pumps |
-
2011
- 2011-11-03 CN CN201120430372XU patent/CN202327074U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102506170A (en) * | 2011-11-03 | 2012-06-20 | 上海唯万密封科技有限公司 | Piston sealing piece manufacturing process and piston sealing piece |
| US9664282B2 (en) | 2013-08-20 | 2017-05-30 | Dow Global Technologies Llc | Polyurethane elastomeric seal for hydraulic pumps |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: Building 1, No. 373 Renqing Road, Pudong New Area, Shanghai, 200319 Patentee after: Shanghai Weiwan Sealing Technology Co., Ltd Address before: No.3, Lane 1300, Kangqiao East Road, Kangqiao Town, Pudong New Area, Shanghai Patentee before: VONESEALS TECHNOLOGY (SHANGHAI) Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120711 |