CN207213161U

CN207213161U - Dust-proof seal ring

Info

Publication number: CN207213161U
Application number: CN201720871096.8U
Authority: CN
Inventors: 王艳华
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-07-18
Filing date: 2017-07-18
Publication date: 2018-04-10
Anticipated expiration: 2027-07-18

Abstract

The utility model discloses a kind of hydraulic cylinder piston rod sealing dust-proof seal ring, including outside dust excluder lips and inner side dust excluder lips, and both use I-shaped connected mode.The utility model is by improving the structure of dust-proof seal ring, and the medial and lateral dust excluder lips of dust-proof seal ring are made using the polyurethane material of different hardness, make dust-proof seal ring that not only there is good resilience, and there is excellent wear-resisting, anti-extrusion performance, so as to improve the sealing property of dust-proof seal ring, its service life is extended.

Description

Dust-proof seal ring

Technical field

Hydraulic jack field is the utility model is related to, it is dust-proof more particularly to a kind of novel hydraulic cylinder piston rod of structure Sealing ring.

Background technology

Hydraulic jack holds piston rod tightly in working in reciprocating mode, by dust excluder lips on the inside of dust-proof seal ring, to prevent foreign matter from entering Enter hydraulic system and destroy primary seal, support ring etc..

The structure of traditional dust-proof seal ring is as shown in figure 1, material is usually shore hardness ShA94 polyurethane.Due to Hydraulic cylinder piston rod and piston cylinder cylinder barrel are larger in right side fit clearance, dust-proof close when hydraulic jack high speed unbalance loading is moved Frictional force between seal and piston rod increases, and dust-proof seal ring is easily taken out of by piston rod, causes seal failure；In addition, work as Hydraulic jack is moved up and down, and when dust-proof seal ring is arranged on hydraulic jack top, the foreign matter of rainwater doping is easy to from anti- Enter on the outside of dirt sealing ring, corrosion channel bottom, destroy outboard seal lip.

Utility model content

The technical problems to be solved in the utility model is to provide a kind of dust-proof seal ring, and it not only has excellent dust-proof close Sealing property, and service life is grown.

In order to solve the above technical problems, dust-proof seal ring of the present utility model, including outside dust excluder lips and inner side dust excluder lips, The outside dust excluder lips and inner side dust excluder lips use I-shaped connection.

Can be L-shaped by the Cross section Design of the outside dust excluder lips preferably, in order to improve the rigidity of dust-proof seal ring.

Preferably, in order to improve the sealing property of dust-proof seal ring, can be close in the increase of the right side of the outside dust excluder lips Seal lip design.

Preferably, in order to protect the oil film on piston rod, the lip of the inner side dust excluder lips can be designed as arc.

The material of the inner side dust excluder lips is preferably the polyurethane of shore hardness ShA90~92, the outside dust excluder lips Material is preferably the polyurethane of shore hardness ShD52~55.

The dust-proof seal ring be preferably integral structure, outside dust excluder lips and inner side dust excluder lips by integrated through injection molding into Type.

Compared with traditional dust-proof seal ring, dust-proof seal ring of the present utility model, there is advantages below and beneficial effect：

1st, outside dust excluder lips use ShD52-55 high hardness polyurethane, and use L-shaped structure, improve dust-proof seal ring Rigidity, wearability and anti-extrusion performance, oil cylinder occur high speed unbalance loading motion when, dust-proof seal ring is not easy to be carried over.

2nd, inner side dust excluder lips use ShA90-92 high-rebound polyurethane, ensure that the resilience of dust-proof seal ring, so as to Piston rod can preferably be held tightly.

3rd, design high hardness polyurethane sealing lip on the right side of the dust excluder lips of outside, improves dust-proof seal ring and trench wall is prevented Water, dust-proof effect, when oil cylinder makees vertical up-or-down movement, the foreign matter that rainwater adulterates can be effectively avoided on the outside of dust-proof seal ring Into protecting trench wall not destroyed by corrosion, the sealing lip of channel bottom.

4th, the lip of inner side dust excluder lips is designed as arc-shaped, and the oil film on piston rod can be protected not scraped by inner side dust excluder lips Remove, such dust-proof seal ring can just work on the surface for having film lubrication, so that the service life of dust-proof seal ring is able to Extend.

Brief description of the drawings

Fig. 1 is the structural representation of traditional hydraulic cylinder piston rod dust-proof seal ring.

Fig. 2 is the overall structure diagram of the dust-proof seal ring of the utility model embodiment.Wherein, A figures are at section Schematic enlarged-scale view.

Fig. 3 is the section concrete structure schematic diagram of Fig. 2 dust-proof seal ring.Wherein, B figures are at the dust excluder lips lip of inner side Enlarged drawing, magnification ratio 5:1.

Fig. 4 is the production process schematic diagram of Fig. 2 dust-proof seal ring.

Fig. 5 is assembling schematic diagram of Fig. 2 dust-proof seal ring in hydraulic jack.

Description of reference numerals is as follows in figure：

1：Cylinder barrel

2：Piston rod

3：Sealing lip

4：Rainwater doping foreign matter possibly into region

5：Dust-proof seal ring

6：Outside dust excluder lips

7：Inner side dust excluder lips

8：Lip

Embodiment

More specifically understand to have to technology contents of the present utility model, feature and effect, in conjunction with the embodiment party of diagram Formula, details are as follows：

The dust-proof seal ring of the present embodiment, obtained by two kinds of different polyurethane materials of hardness by single injection-molded, Overall is in annular, as shown in Fig. 2 including the outside dust excluder lips 6 in I-shaped connection and the two parts of inner side dust excluder lips 7.Wherein：

Outside dust excluder lips 6, using the high hardness polyurethane of shore hardness ShD52~55, section approximation L-shaped, such as Fig. 3 institutes Show.The right side of outside dust excluder lips 6 is designed with sealing lip 3, for waterproof and dustproof, avoids the foreign matter that rainwater adulterates from dust seal The inwall for the groove that circle outside enters between cylinder barrel 1 and piston rod 2 and bottom.

Inner side dust excluder lips 7, using the high-rebound polyurethane of shore hardness ShA90~92, section approximation Y shape.Inner side is dust-proof The lip 8 of lip 7 is in arc-shaped, as shown in Figure 3.

The dust-proof seal ring can use rotating bichromal injector to process, as shown in figure 4, specific production process is such as Under：

First station barrel melts the high-rebound polyurethane of ShA90~92,180~230 DEG C of melting temperature in advance.

Second station barrel melts the high hardness polyurethane of ShD52~55,190~250 DEG C of melting temperature in advance.

In the first station of double color mould, under 15~25Mpa injection pressures, injection is pre- melt after the polyurethane 3 of ShA90~92 ~5 seconds, it is molded the inner side dust excluder lips 7 of dust-proof seal ring.Pressurize cools down 20~30 seconds.

Then rotate to second station, under 20~30Mpa injection pressures, injection is pre- melt after the polyurethane 4 of ShD52~55 ~6 seconds, it is molded the outside dust excluder lips of dust-proof seal ring.Cool down pressurize 20~30 seconds.

Finally die sinking ejection, take out dust-proof seal ring product.

In use, the dust-proof seal ring is assembled to the cylinder barrel of hydraulic jack and the gap location of piston rod cooperation, such as Fig. 5 institutes Show.Because the outside dust excluder lips of dust-proof seal ring are gathered using high hardness polyurethane, inner side dust excluder lips using high resilience Urethane, make it that not only there is good resilience, and there is excellent wear-resisting, anti-extrusion performance.Meanwhile outside dust excluder lips The sealing lip on L-shaped section and right side designs, and further improves the sealing property of dust-proof seal ring；And the circular arc of inner side dust excluder lips Shape lip then protects the oil film on piston rod, extends the service life of dust-proof seal ring.

Claims

1. hydraulic jack dust-proof seal ring, it is characterised in that including outside dust excluder lips and inner side dust excluder lips, the outside is dust-proof Lip and inner side dust excluder lips use I-shaped connection, and the section of the outside dust excluder lips is L-shaped.

2. dust-proof seal ring according to claim 1, it is characterised in that be provided with sealing on the right side of the outside dust excluder lips Lip.

3. dust-proof seal ring according to claim 1, it is characterised in that the lip of the inner side dust excluder lips is curved.

4. dust-proof seal ring according to claim 1, it is characterised in that the material of the inner side dust excluder lips is shore hardness The polyurethane of ShA90~92.

5. dust-proof seal ring according to claim 1, it is characterised in that the material of the outside dust excluder lips is shore hardness The polyurethane of ShD52~55.

6. dust-proof seal ring according to claim 1, it is characterised in that the dust-proof seal ring is integral type structure.