CN201339212Y

CN201339212Y - Hydraulic system of digger

Info

Publication number: CN201339212Y
Application number: CNU2009200881691U
Authority: CN
Inventors: 朱成建; 耿家文; 姚喜; 郑磊; 顾新建; 戚兆伟
Original assignee: Xuzhou Huadong Sentian Heavy Machinery Co Ltd
Current assignee: Xuzhou Huadong Sentian Heavy Machinery Co Ltd
Priority date: 2009-01-06
Filing date: 2009-01-06
Publication date: 2009-11-04
Anticipated expiration: 2019-01-06

Abstract

Disclosed is a hydraulic system of a digger. An oil suction filter connected with an oil tank is connected at one end of a main pump, and a main valve connected with a radiator is connected at the other end of the main pump; the radiator is connected with a main line returned oil filter which is connected with the oil tank; the main valve is also connected with a check valve which is connected with the oil tank; one end of a bypass returned oil filter is connected at the front side of the radiator; and the other end of the bypass returned oil filter is connected with the oil tank, forming a bypass oil return loop. The hydraulic system can filtrate the impurities in the hydraulic oil at real time, thus greatly reducing the abrasion of the hydraulic elements; meanwhile; the bypass returned oil filter, with filtering precision about 1-2 micron, has good water absorption and can filtrate the moisture in the hydraulic oil; the replacement cycle of the hydraulic oil of the digger can be increased from 2,000h to 10,000h; the fault rate of the hydraulic system is reduced; and the work efficiency is improved.

Description

Excavator hydraulic system

Technical field

The utility model relates to a kind of oil suction, oil return circuit device of excavator hydraulic pressure.

Background technology

In the excavator hydraulic system fault, about 70% problem is to produce because of hydraulic oil pollution, pollution can be divided into solia particle and moisture two classes, in the solid particle, contamination particle and difference gap be size seldom, adding intrasystem machine power has harmfulness most, and size can be to 0.5-5 μ m in system in this power gap.Moisture can increase the hydraulic oil acid number, causes the original paper corrosion, and makes hydraulic oil emulsification, hydrolysis, oxidation, destroys additive, causes various hydraulic faults.

Existing excavator hydraulic system is provided with filtration at oil suction, oil return circuit, its filtering accuracy is generally oil suction 100 μ m, oil return 10 μ m, and the minimum 0.5-5 μ m that is about in the power gap of hydraulic pressure original paper, the conventional filtration device does not possess water absorbing properties simultaneously, can not avoid the wearing and tearing of hydraulic pressure original paper fully.

Summary of the invention

The purpose of this utility model provides a kind of impurity in can real time filtering hydraulic oil, reduces the wearing and tearing of hydraulic pressure original paper greatly, has good water imbibition simultaneously, can filter the excavator hydraulic system of hydraulic pressure water content in oil.

The purpose of this utility model is achieved in that main pump one end connects the oil suction strainer, the oil suction strainer connects fuel tank, the main pump other end connects main valve, and main valve connects radiator, and radiator connects the main line return filter, the main line return filter connects fuel tank, main valve also connects one way valve, and one way valve connects fuel tank, and bypass return filter one end is connected before the radiator, the bypass return filter other end connects fuel tank, forms the bypass oil return line.

Because the utility model adopts said structure, impurity in can real time filtering hydraulic oil, reduce the wearing and tearing of hydraulic pressure original paper greatly, simultaneously, bypass return filter (filtering accuracy is about 1 ~ 2 μ m) has good water imbibition, can filter the moisture in the hydraulic oil, and the replacement cycle of excavator hydraulic oil can be increased to 10000 hours by 2000 hours, reduce the hydraulic system fault rate, increase work efficiency.

Description of drawings

Fig. 1 is a structure chart of the present utility model.

1 oil suction strainer, 2 main pumps, 3 main valves, 4 radiators, 5 one way valves, 6 bypass return filters, 7 main line return filters among the figure.

The specific embodiment

Embodiment: main pump 2 one ends connect oil suction strainer 1, oil suction strainer 1 connects fuel tank, main pump 2 other ends connect main valve 3, and main valve 3 connects radiator 4, and radiator 4 connects main line return filter 7, main line return filter 7 connects fuel tank, main valve 3 also connects one way valve 5, and one way valve connects fuel tank, and bypass return filter 6 one ends are connected before the radiator 4, bypass return filter 6 other ends connect fuel tank, form the bypass oil return line.

Adopting Reynolds machinery Co., Ltd of Fujian section production model is the bypass return filter 6 of TCK-SFKN-8H filtering accuracy 1 μ m; be installed on the oil return line of hydraulic system; be positioned at before the radiator 4; hydraulic oil-returning is leaded up to radiator 4 and main line return filter 7 and is entered fuel tank; another road enters bypass return filter 6; enter fuel tank by the road; bypass return filter 6 is worked simultaneously with main line return filter 7; only account for about 5% of total recirculating oil quantity by flow; even also stopping up, not influence system runs well; original one way valve 5 can be protected bypass return filter 6 in the system, makes its operating pressure be unlikely to too high, avoids destroying.

Claims

1, a kind of excavator hydraulic system, main pump one end connects the oil suction strainer, and the oil suction strainer connects fuel tank, and the main pump other end connects main valve, main valve connects radiator, radiator connects the main line return filter, and the main line return filter connects fuel tank, and main valve also connects one way valve, one way valve connects fuel tank, it is characterized in that: bypass return filter one end is connected before the radiator, and the bypass return filter other end connects fuel tank, forms the bypass oil return line.