CN201972998U - Engineering machinery and hydraulic cylinder piston rod waterproof device thereof - Google Patents

Engineering machinery and hydraulic cylinder piston rod waterproof device thereof Download PDF

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Publication number
CN201972998U
CN201972998U CN2011200663336U CN201120066333U CN201972998U CN 201972998 U CN201972998 U CN 201972998U CN 2011200663336 U CN2011200663336 U CN 2011200663336U CN 201120066333 U CN201120066333 U CN 201120066333U CN 201972998 U CN201972998 U CN 201972998U
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CN
China
Prior art keywords
pressure
hydraulic
piston rod
tight
water
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Expired - Lifetime
Application number
CN2011200663336U
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Chinese (zh)
Inventor
缪雄辉
向阳辉
张德胜
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Sany Automobile Manufacturing Co Ltd
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Sany Heavy Industry Co Ltd
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Priority to CN2011200663336U priority Critical patent/CN201972998U/en
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Publication of CN201972998U publication Critical patent/CN201972998U/en
Anticipated expiration legal-status Critical
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Abstract

The utility model discloses a hydraulic cylinder piston rod waterproof device which comprises a pressure cover (1), lip sealing rings (2) and a hydraulic system (3), wherein the pressure cover (1) is connected outside a piston rod; the hydraulic system (3) consists of a main oil path and a return oil path that are connected at a fulcrum (37); the inner end of the main oil path is communicated with a pressure oil cavity (21) between the two lip sealing rings (2), and the outer end of the main oil path is connected with a hydraulic oil source (31) and a check valve (32) in series; the return oil path is provided with an overflowing valve (34) and an oil tank (35); and the hydraulic system (3) further comprises a decompression valve (33) which is arranged between the hydraulic oil source (31) and the fulcrum (37). The waterproof device can extend the range of regulating pressure of the overflowing valve. The utility model further discloses an engineering machine comprising the waterproof device, which has identical technical effects.

Description

Engineering machinery and hydraulic cylinder piston rod water-tight device thereof
Technical field
The utility model relates to technical field of engineering machinery, relates in particular to a kind of hydraulic cylinder piston rod water-tight device that is used for engineering machinery.The utility model also relates to a kind of engineering machinery that comprises above-mentioned hydraulic cylinder piston rod water-tight device.
Background technique
Along with the fast development of China's economic construction, all kinds of major workss increase gradually, and market is also more and more stronger for the demand of all kinds of large-scale engineering machineries.
Concrete mixer is modal engineering machinery, is used for the concrete construction of engineerings such as railway and vcehicular tunnel, bridges and culverts, water power, mine, tall building and national defence.Concrete mixer is the machinery that utilizes pressure that concrete is carried continuously along pipeline, and mainly by transmission and concrete transmission hydraulic system, stirring hydraulic system, cleaning solution pressing system, and the pump truck support system is formed.
Concrete pump is the important device of transmission and concrete transmission hydraulic system, mainly finishes the working procedure of suction, feeding by the to-and-fro motion of hydraulic cylinder piston rod.In the course of the work, because hydraulic cylinder piston rod is under water, when piston rod bounces back, easily water is brought in the hydraulic oil.Usually the way that adopts is to adopt two groups of piston rod seals, and one group of relative Sealing of lip is used for oil sealing, and one group of dust ring is used for stoping the immersion of environmental contaminants.When piston rod retreats, during through dust ring, dust ring has one to scrape the effect of squeezing to the moisture film that is attached to piston rod surface, yet, because dust ring only is the pressure of dust ring resiliently deformable generation to the pressure of piston rod surface, be not enough to the moisture film on the piston rod is all scraped, cause the hydraulic oil emulsion deterioration easily.
At the problems referred to above, taked corresponding hydraulic cylinder piston rod water-tight device to solve in the prior art.Please refer to Fig. 1, Fig. 1 is the structural representation of hydraulic cylinder piston rod water-tight device in the prior art; Briefly introduce the defective that this hydraulic cylinder piston rod water-tight device exists at work below.
In the prior art, as shown in Figure 1, this water-tight device is arranged at the outside of piston rod, mainly comprise gland 1 ', two lip-type packings 2 ' and hydraulic system 3 ', hydraulic system 3 ' the inner of working connection be communicated in two lip-type packings 2 ' between pressure oil cavity 21 ', its outer end be serially connected with hydraulic oil source 31 ', one-way valve 32 ', and hydraulic system 3 ' oil circuit be connected with relief valve 33 ' and fuel tank 34 '.
During proper functioning, hydraulic oil source 31 ' with hydraulic oil through oil circuit incoming pressure oil pocket 21 ', make lip-type packing 2 ' lower lip be close to the outer wall of piston rod, during the piston rod to-and-fro motion oil of the water of minute quantity and piston rod brought into pressure oil cavity 21 ', along with the liquid of bringing into is on the increase, will cause pressure oil cavity 21 ' pressure raise, when pressure be elevated to relief valve 33 ' set pressure the time, relief valve 33 ' unlatching, make pressure oil cavity 21 ' in oil water mixture flow into fuel tank 34 '; Because seal ring itself has elasticity, under the pressure oil effect, the moisture film on the piston rod can be scraped extract clean, thereby guarantee water can not immerse hydraulic system 3 ', effectively prevented the hydraulic oil emulsion deterioration.
Yet, in the above-mentioned water-tight device, relief valve 33 ' set pressure must be higher than hydraulic oil source 31 ' force value, can't be according to actual needs with relief valve 33 ' pressure be adjusted to littler, make pressure oil cavity 21 ' in force value higher, thereby increased piston rod and lip-type packing 2 ' between frictional force, when the piston rod rapid movement, cause lip-type packing 2 ' Yin Gaowen easily and damage.
This shows, how on the basis of existing technology, improve the structure of hydraulic cylinder piston rod water-tight device, can increase the scope of the set pressure of relief valve, strengthening the functional reliability and the adaptability of hydraulic cylinder piston rod water-tight device, is that those skilled in the art is badly in need of the technical problem that solves at present.
The model utility content
The technical problems to be solved in the utility model is for providing a kind of hydraulic cylinder piston rod water-tight device that is used for engineering machinery, and this water-tight device can increase the scope of the set pressure of relief valve, thereby strengthens the functional reliability and the adaptability of water-tight device.Another technical problem to be solved in the utility model is for providing a kind of engineering machinery that comprises above-mentioned hydraulic cylinder piston rod water-tight device.
For solving the problems of the technologies described above, the utility model provides a kind of hydraulic cylinder piston rod water-tight device, comprises the gland, lip-type packing and the hydraulic system that are connected in described piston rod outside; Described hydraulic system comprises working connection and the oil circuit that is connected in fulcrum; The inner of described working connection is communicated in two pressure oil cavities between the described lip-type packing, and its outer end is serially connected with hydraulic oil source and one-way valve; Described oil circuit is provided with relief valve and fuel tank; Described hydraulic system also comprises reduction valve, and described reduction valve is located between described hydraulic oil source and the described fulcrum.
Preferably, the set pressure of described relief valve is greater than the set pressure of described reduction valve, and less than the force value of described hydraulic oil source.
Preferably, the set pressure of described relief valve is greater than the force value of described hydraulic oil source.
Preferably, described hydraulic system also comprises accumulator, and described accumulator is arranged between described hydraulic oil source and the described reduction valve.
Preferably, the set pressure of described relief valve is greater than the set pressure of described reduction valve, and less than the force value of described accumulator.
Preferably, the set pressure of described relief valve is greater than the force value of described accumulator.
Preferably, described lip-type packing is the rubber lip-type packing.
The utility model also provides a kind of engineering machinery, comprises oil hydraulic cylinder; Also comprise above-mentioned hydraulic cylinder piston rod water-tight device, described hydraulic cylinder piston rod water-tight device is located at the outside of the piston rod of described oil hydraulic cylinder.
Preferably, described engineering machinery is specially concrete pump truck.
Hydraulic cylinder piston rod water-tight device provided by the utility model, its hydraulic system also comprises reduction valve, reduction valve is located between hydraulic oil source and the fulcrum.
Adopt the hydraulic cylinder piston rod water-tight device of said structure, set in advance the set pressure of reduction valve and the set pressure of relief valve, the set pressure of the set pressure of relief valve greater than reduction valve can be set, and force value greater than hydraulic oil source, the set pressure of the set pressure of relief valve greater than reduction valve also can be set, and less than the force value of hydraulic oil source; When proper functioning, the hydraulic oil source pressure oil output, pressure oil flow through reduction valve and one-way valve, its pressure is reduced to the set pressure of reduction valve, flow into the pressure oil cavity of lip-type packing again, make the lower lip of lip-type packing be close to the outer wall of piston rod, when the piston rod to-and-fro motion, bring the oil of a spot of water and piston rod into pressure oil cavity, along with the liquid of bringing into is on the increase, will cause that the pressure of pressure oil cavity raises, when pressure is elevated to the set pressure of relief valve, relief valve is opened, and makes the oil water mixture in the pressure oil cavity flow into fuel tank; Because seal ring itself has elasticity, under the pressure oil effect, the moisture film on the piston rod can be scraped and extract only, thereby guarantee that water can not immerse the hydraulic system hydraulic system, has effectively prevented the hydraulic oil emulsion deterioration.
This shows, the hydraulic cylinder piston rod water-tight device of above-mentioned serial connection reduction valve can be provided with the set pressure of relief valve according to actual needs, can increase the scope of the set pressure of relief valve, make operator can set the set pressure of relief valve according to actual conditions, thereby the pressure between the pressure oil cavity is remained on suitable scope, strengthened the functional reliability and the adaptability of hydraulic cylinder piston rod water-tight device.
Because above-mentioned hydraulic cylinder piston rod water-tight device has above-mentioned useful technique effect, therefore, comprises that the engineering machinery of this water-tight device also should have identical technique effect, does not repeat them here.
Description of drawings
Fig. 1 is the structural representation of a kind of hydraulic cylinder piston rod water-tight device in the prior art;
Fig. 2 provides the structural representation of a kind of embodiment of hydraulic cylinder piston rod water-tight device for the utility model;
Fig. 3 is the gland among Fig. 2 and the partial enlarged drawing of lip-type packing joint;
Fig. 4 provides the structural representation of the another kind of embodiment of hydraulic cylinder piston rod water-tight device for the utility model.
Wherein, the corresponding relation between reference character and the component names is among Fig. 1:
1 ' gland; 2 ' lip-type packing; 3 ' hydraulic system; 21 ' pressure oil cavity; 31 ' hydraulic oil source; 32 ' one-way valve; 33 ' relief valve; 34 ' fuel tank;
Corresponding relation among Fig. 2 to Fig. 4 between reference character and the component names is:
1 gland; 2 lip-type packings; 3 hydraulic systems; 21 pressure oil cavities; 31 hydraulic oil sources; 32 one-way valves; 33 reduction valve; 34 relief valves; 35 fuel tanks; 36 accumulators; 37 fulcrums.
Embodiment
Core of the present utility model is for providing a kind of hydraulic cylinder piston rod water-tight device that is used for engineering machinery, and this water-tight device can increase the scope of the set pressure of relief valve, thereby strengthens the functional reliability and the adaptability of water-tight device.Another core that the utility model is wanted is for providing a kind of engineering machinery that comprises above-mentioned hydraulic cylinder piston rod water-tight device.
In order to make those skilled in the art understand the technical solution of the utility model better, the utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Please refer to Fig. 2 and Fig. 3, Fig. 2 provides the structural representation of a kind of embodiment of hydraulic cylinder piston rod water-tight device for the utility model; Fig. 3 is the gland among Fig. 2 and the partial enlarged drawing of lip-type packing joint.
In a kind of concrete mode of execution, as shown in Figures 2 and 3, hydraulic cylinder piston rod water-tight device provided by the utility model comprises gland 1, two lip-type packings 2 and hydraulic systems 3; Gland 1 is connected in the outside of hydraulic cylinder piston rod; Two lip-type packings 2 are located between the piston rod of gland 1 and oil hydraulic cylinder, and the lip of two lip-type packings 2 is relative, form pressure oil cavity 21; Hydraulic system 3 comprises working connection and oil circuit, working connection and oil circuit are connected in fulcrum 37, the inner of working connection is communicated in two pressure oil cavities 21 between the lip-type packing 2, the outer end of working connection is serially connected with hydraulic oil source 31, one-way valve 32 and reduction valve 33, reduction valve 33 is located between the fulcrum 37 of hydraulic oil source 31 and hydraulic system 3, is serially connected with relief valve 34 and fuel tank 35 on the oil circuit.
Adopt the hydraulic cylinder piston rod water-tight device of said structure, set in advance the set pressure of reduction valve 33 and the set pressure of relief valve 34, the set pressure of the set pressure of relief valve 34 greater than reduction valve 33 can be set, and force value greater than hydraulic oil source 31, the set pressure of the set pressure of relief valve 34 greater than reduction valve 33 also can be set, and less than the force value of hydraulic oil source 31; When proper functioning, hydraulic oil source 31 pressure oil output, pressure oil flow through reduction valve 33 and one-way valve 32, its pressure is reduced to the set pressure of reduction valve 33, flow into the pressure oil cavity 21 of lip-type packing 2 again, make the lower lip of lip-type packing 2 be close to the outer wall of piston rod, when the piston rod to-and-fro motion, bring the oil of a spot of water and piston rod into pressure oil cavity 21, along with the liquid of bringing into is on the increase, will cause that the pressure of pressure oil cavity 21 raises, when pressure is elevated to the set pressure of relief valve 34, relief valve 34 is opened, and makes the oil water mixture in the pressure oil cavity 21 flow into fuel tank 35; Because seal ring itself has elasticity, under the pressure oil effect, the moisture film on the piston rod can be scraped and extract only, thereby guarantee that water can not immerse hydraulic system 3, has effectively prevented the hydraulic oil emulsion deterioration.
This shows, the hydraulic cylinder piston rod water-tight device of above-mentioned serial connection reduction valve 33, can increase the scope of the set pressure of relief valve 34, make operator that the set pressure of relief valve can be set according to actual needs, thereby the pressure between the pressure oil cavity 21 is remained on suitable scope, strengthened the functional reliability and the adaptability of hydraulic cylinder piston rod water-tight device.
In addition, serial connection reduction valve 33 in working connection, make no matter how the force value of hydraulic oil source 31 changes, force value in the pressure oil cavity 21 all is the stationary value of being set up by Fixed pressure reducing valve 33, make that lip-type packing 2 can be because of not excessive and burn out with piston rod frictional force, can not cause the waterproof grommet fatigue damage yet, prolong the life-span of lip-type packing 2 effectively.
Need to prove; above-mentioned embodiment does not specifically limit the concrete set pressure scope of relief valve 34; do not limit the concrete form of hydraulic oil source 31 yet; do not limit the particular location of reduction valve 33 and one-way valve 32 yet; in fact; every working connection is serially connected with reduction valve 33, can increase the hydraulic cylinder piston rod water-tight device of the set pressure scope of relief valve 34, all should work as to belong in the protection domain of the present utility model.
In addition, above-mentioned fulcrum 37 refers to the working connection of hydraulic system 3 and the intersection point of oil circuit, and the common components of this fulcrum 37 is the three-dimensional oil pipe, certainly, also can be other parts.The said herein noun of locality " interior " refers to along hydraulic cylinder piston rod radially; from the outside of piston rod to the direction of piston rod central shaft; the noun of locality " outward " refers to along hydraulic cylinder piston rod radially; point to the direction of the outside of piston rod from the piston rod central shaft; be to be understood that; these nouns of locality are that benchmark is set up with accompanying drawing herein, and their appearance should not influence protection domain of the present utility model.
The scope of the set pressure of above-mentioned relief valve 34 can also further be set.In the concrete scheme, the set pressure of the set pressure of relief valve 34 greater than reduction valve 33 can be set, and less than the force value of hydraulic oil source 31.The set pressure scope of OK range is set, the force value of pressure oil cavity 21 can be adjusted to one and can satisfy waterproofing effect, can reduce the frictional force between piston rod and the seal ring again, thereby prevent that lip-type packing 2 damages because of localized hyperthermia when the piston rod rapid movement.Certainly, the set pressure that relief valve 34 can also be set can be greater than the force value of hydraulic oil source 31, and the user can select as required voluntarily.
The specific constructive form of oil sources in the above-mentioned hydraulic system 3 can also further be set.
In the concrete mode of execution of another kind, as shown in Figure 2, above-mentioned hydraulic system 3 can also comprise accumulator 36, and this accumulator 36 is serially connected with between hydraulic oil source 31 and the reduction valve 33.Adopt this structure, the hydraulic shock that accumulator 36 can absorption liquid pressing system 3 starts or stops suddenly at power plant, oil hydraulic cylinder moves suddenly or occurred when stopping, pressure pulsation in the time of also absorbing power plant work, for hydraulic system 3 provides more stable pressure oil, thereby strengthened the stability of pressure oil in the pressure oil cavity 21.
Further in the scheme, the set pressure of above-mentioned relief valve 34 can be greater than the set pressure of reduction valve 33, and less than the force value of accumulator 36.Same reason, the set pressure scope of such OK range is set, the force value of pressure oil cavity 21 can be adjusted to one and can satisfy waterproofing effect, can reduce the frictional force between piston rod and the seal ring again, thereby prevent that lip-type packing 2 damages because of localized hyperthermia when the piston rod rapid movement.Certainly, the set pressure that relief valve 34 can also be set can be greater than the force value of accumulator 36, and the user can select as required voluntarily.
The structural type of above-mentioned hydraulic cylinder piston rod water-tight device can also further be set.
Please refer to Fig. 4, Fig. 4 provides the structural representation of the another kind of embodiment of hydraulic cylinder piston rod water-tight device for the utility model.
In the concrete mode of execution of another kind, as shown in Figure 4, the one-way valve 32 of above-mentioned hydraulic cylinder piston rod water-tight device can be arranged between accumulator 36 and the reduction valve 33, certainly, as shown in Figure 3, the reduction valve 33 of above-mentioned hydraulic cylinder piston rod water-tight device also can be arranged between accumulator 36 and the one-way valve 32, this make the user can be according to actual needs and the space size reasonable select.
Above-mentioned hydraulic oil source 31 can be specially the hydraulic oil source of various ways, and for example plunger pump, vane pump and gear pump etc. certainly, can also be other forms of power source.
Above-mentioned lip-type packing 2 can be specially the rubber lip-type packing, and rubber seal has advantages such as light weight, wear resistance be good, and certain above-mentioned lip-type packing 2 is not limited only to rubber seal, can also be other forms of seal rings such as sealed nylon circle.
The utility model also provides a kind of engineering machinery, comprises oil hydraulic cylinder; Also comprise above-mentioned hydraulic cylinder piston rod water-tight device, this hydraulic cylinder piston rod water-tight device is located at the outside of the piston rod of oil hydraulic cylinder.Because above-mentioned hydraulic cylinder piston rod water-tight device has above-mentioned useful technique effect, therefore, comprises that the engineering machinery of this water-tight device also should have identical technique effect, does not repeat them here.
Further, above-mentioned engineering machinery can be specially concrete mixer.Need to prove, the utility model only is the useful technique effect that example has been introduced above-mentioned hydraulic cylinder piston rod water-tight device with the concrete mixer, in fact, above-mentioned water-tight device not only limits the use of in concrete mixer, and is applicable in any engineering machinery that comprises oil hydraulic cylinder.
More than a kind of engineering machinery provided by the utility model and hydraulic cylinder piston rod water-tight device 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 (9)

1. a hydraulic cylinder piston rod water-tight device comprises the gland (1), lip-type packing (2) and the hydraulic system (3) that are connected in described piston rod outside; Described hydraulic system (3) comprises working connection and the oil circuit that is connected in fulcrum (37); The inner of described working connection is communicated in the pressure oil cavity (21) between two described lip-type packings (2), and its outer end is serially connected with hydraulic oil source (31) and one-way valve (32); Described oil circuit is provided with relief valve (34) and fuel tank (35); It is characterized in that described hydraulic system (3) also comprises reduction valve (33), described reduction valve (33) is located between described hydraulic oil source (31) and the described fulcrum (37).
2. water-tight device according to claim 1 is characterized in that, the set pressure of described relief valve (34) is greater than the set pressure of described reduction valve (33), and less than the force value of described hydraulic oil source (31).
3. water-tight device according to claim 1 is characterized in that, the set pressure of described relief valve (34) is greater than the force value of described hydraulic oil source (31).
4. according to each described water-tight device of claim 1-3, it is characterized in that described hydraulic system (3) also comprises accumulator (36), described accumulator (36) is arranged between described hydraulic oil source (31) and the described reduction valve (33).
5. water-tight device according to claim 4 is characterized in that, the set pressure of described relief valve (34) is greater than the set pressure of described reduction valve (33), and less than the force value of described accumulator (36).
6. water-tight device according to claim 4 is characterized in that, the set pressure of described relief valve (34) is greater than the force value of described accumulator (36).
7. according to each described water-tight device of claim 1-3, it is characterized in that described lip-type packing (2) is the rubber lip-type packing.
8. an engineering machinery comprises oil hydraulic cylinder; It is characterized in that also comprise each described hydraulic cylinder piston rod water-tight device as claim 1-7, described hydraulic cylinder piston rod water-tight device is located at the outside of the piston rod of described oil hydraulic cylinder.
9. engineering machinery according to claim 8 is characterized in that described engineering machinery is specially concrete pump truck.
CN2011200663336U 2011-03-15 2011-03-15 Engineering machinery and hydraulic cylinder piston rod waterproof device thereof Expired - Lifetime CN201972998U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011200663336U CN201972998U (en) 2011-03-15 2011-03-15 Engineering machinery and hydraulic cylinder piston rod waterproof device thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011200663336U CN201972998U (en) 2011-03-15 2011-03-15 Engineering machinery and hydraulic cylinder piston rod waterproof device thereof

Publications (1)

Publication Number Publication Date
CN201972998U true CN201972998U (en) 2011-09-14

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Application Number Title Priority Date Filing Date
CN2011200663336U Expired - Lifetime CN201972998U (en) 2011-03-15 2011-03-15 Engineering machinery and hydraulic cylinder piston rod waterproof device thereof

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103452953A (en) * 2013-09-05 2013-12-18 中联重科股份有限公司 Hydraulic oil cylinder, waterproof system thereof and concrete pumping device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103452953A (en) * 2013-09-05 2013-12-18 中联重科股份有限公司 Hydraulic oil cylinder, waterproof system thereof and concrete pumping device

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GR01 Patent grant
C14 Grant of patent or utility model
C41 Transfer of patent application or patent right or utility model
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: 20130502

TR01 Transfer of patent right

Effective date of registration: 20130502

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.

CX01 Expiry of patent term

Granted publication date: 20110914

CX01 Expiry of patent term