CN202689076U

CN202689076U - Pilot oil source control valve bank of hydraulic excavator

Info

Publication number: CN202689076U
Application number: CN 201220336365
Authority: CN
Inventors: 韩立志; 刘合涛; 王勇; 高春生; 董致新
Original assignee: Xuzhou XCMG Excavator Machinery Co Ltd
Current assignee: Xuzhou XCMG Excavator Machinery Co Ltd
Priority date: 2012-07-12
Filing date: 2012-07-12
Publication date: 2013-01-23
Anticipated expiration: 2022-07-12

Abstract

The utility model discloses a pilot oil source control valve bank of a hydraulic excavator, belonging to the technical field of hydraulic excavators. The pilot oil source control valve bank of the hydraulic excavator comprises a filter, an overflowing valve, a first electromagnetic reversing valve and a second electromagnetic reversing valve as well as a test connector, a first one-way valve, an energy accumulator and a third one-way valve, wherein a port P of the valve body is connected with the filter; the filter is connected with the test connector, a port 1 of the first one-way valve, a port 1 of the overflowing valve and a port 1 of the third one-way valve respectively; and a port 2 of the third one-way valve is connected with a port T of the valve body through a port 2 of the first electromagnetic reversing valve. The utility model has the benefits that the pilot oil source control valve bank of the hydraulic excavator can effectively protect a pilot pump, prolong the service life of the pilot pump and reduce oil consumption.

Description

Hydraulic crawler excavator leading oil source control valve group

Technical field

The utility model relates to a kind of leading oil source control valve group, and specifically a kind of hydraulic crawler excavator leading oil source control valve group belongs to the hydraulic crawler excavator technical field.

Background technology

The control of the leading oil source control valve group that hydraulic crawler excavator is used is normally undertaken by two two-bit triplet solenoid operated directional valves, after the engine start, when the excavator car load is not worked, during the security solenoid valve no signal, because pioneer pump is constant displacement pump, there is fluid to spue always, and the oil circuit of pilot valve can not directly take back fuel tank, need to flow back to fuel tank by the pressure limit of overflow valve, under this state, pilot system is in overflow valve always and establishes the pressure pressure condition, has so both affected the life-span of pioneer pump, and certain oil consumption loss is also arranged.

Summary of the invention

For the problem that above-mentioned prior art exists, the utility model provides a kind of hydraulic crawler excavator leading oil source control valve group, can effectively protect pioneer pump, prolongs the life-span of pioneer pump, reduces oil consumption.

To achieve these goals, the technical solution adopted in the utility model is: a kind of hydraulic crawler excavator leading oil source control valve group, comprise strainer, overflow valve, the first solenoid operated directional valve and the second solenoid operated directional valve, also comprise test splice, the first one way valve, accumulator and the 3rd one way valve, the P mouth of valve body is connected with strainer, strainer respectively with test splice, 1 mouthful of the first one way valve, 1 mouthful of overflow valve 1 mouthful of connection with the 3rd one way valve, test splice respectively with 1 mouthful of the first one way valve, 1 mouthful of the 3rd one way valve is connected 1 mouthful of connection with overflow valve, 1 mouthful of the first one way valve with the 3rd one way valve 1 mouthful is connected, 2 mouthfuls of the first one way valve respectively with 1 mouthful of the first solenoid operated directional valve, 1 mouthful of the second solenoid operated directional valve is connected with accumulator, 1 mouthful of accumulator and the first solenoid operated directional valve is connected, 2 mouthfuls of the 3rd one way valve with the first solenoid operated directional valve 3 mouthfuls are connected, 2 mouthfuls of overflow valve respectively with 2 mouthfuls of the first solenoid operated directional valve, 2 mouthfuls of the second solenoid operated directional valve are connected the T mouth and are connected with valve body, 3 mouthfuls of the A mouth of valve body and the first solenoid operated directional valve are connected, and 3 mouthfuls of the B mouth of valve body and the second solenoid operated directional valve are connected.

Further, also comprise the second one way valve, the second one way valve is connected in parallel on the two ends of strainer.

The beneficial effects of the utility model are: can realize engine start and leading hydraulic system when not working is in the pressure release state; set direction by one way valve; make the fluid of the hydraulic system of pioneer pump flow back to fuel tank by safety valve; avoided the leading hydraulic system of common leading oil source control valve group control to be in the pressure that overflow valve is set; protect guide's hydraulic pump, saved simultaneously fuel consume.

Description of drawings

Fig. 1 is hydraulic principle schematic diagram of the present utility model.

Among the figure: 1, strainer, 2, test splice, the 3, first one way valve, 4, accumulator, the 5, second one way valve, 6, overflow valve, the 7, the 3rd one way valve, the 8, first solenoid operated directional valve, the 9, second solenoid operated directional valve.

The specific embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

As shown in Figure 1, a kind of hydraulic crawler excavator leading oil source control valve group, comprise strainer 1, overflow valve 6, the first solenoid operated directional valve 8 and the second solenoid operated directional valve 9, also comprise test splice 2, the first one way valve 3, accumulator 4 and the 3rd one way valve 7, the P mouth of valve body is connected with strainer 1, strainer 1 respectively with test splice 2,1 mouthful of the first one way valve 3,1 mouthful of overflow valve 61 mouthful of connection with the 3rd one way valve 7, test splice 2 respectively with 1 mouthful of the first one way valve 3,1 mouthful of 1 mouthful of connection of being connected with overflow valve of the 3rd one way valve 7,1 mouthful of the first one way valve 3 with the 3rd one way valve 71 mouthful is connected, 2 mouthfuls of the first one way valve 3 respectively with 1 mouthful of the first solenoid operated directional valve 8,1 mouthful of the second solenoid operated directional valve 9 is connected connection with accumulator, 1 mouthful of accumulator 4 and the first solenoid operated directional valve 8 is connected, 2 mouthfuls of the 3rd one way valve 7 with the first solenoid operated directional valve 83 mouthfuls are connected, 2 mouthfuls of overflow valve 6 respectively with 2 mouthfuls of the first solenoid operated directional valve 8,2 mouthfuls of the second solenoid operated directional valve 9 are connected the T mouth and are connected with valve body, 3 mouthfuls of the A mouth of valve body and the first solenoid operated directional valve 8 are connected, and 3 mouthfuls of the B mouth of valve body and the second solenoid operated directional valve 9 are connected.

Preferred second one way valve 5 that increases; the second one way valve 5 is in parallel with strainer 1; when the pressure reduction at strainer 1 two ends during greater than the second one way valve 5 opening pressure, pilot pressure oil can be by the second one way valve 5, cleans or more before the renew cartridge hydraulic pilot system is played a protective role the driver.

Wherein the P mouth of valve body outside connects pioneer pump, the outside fuel tank that connects of the T mouth of valve body, and the A mouth outside of valve body is connected to the oil-in of pilot control element, and the B mouth of valve body is outside to be communicated with the control port of running motor speed change.

The course of work: when the first solenoid operated directional valve 8 no signal normality, this moment, the first solenoid operated directional valve 8 under spring action was in the work of left position, 3 mouthfuls of this moment 2 mouthfuls of the first solenoid operated directional valve 8 and the first solenoid operated directional valve 8 are communicated with, the fluid that pioneer pump spues passes to 3 mouthfuls of the first solenoid operated directional valve 8 through the 3rd one way valve 7, and the T mouth by valve body is back to fuel tank; When the first solenoid operated directional valve 8 has signal, the first solenoid operated directional valve 8 transfers the work of right position to, 3 mouthfuls of the first solenoid operated directional valve 8 with the first solenoid operated directional valve 82 mouthfuls disconnect, 3 mouthfuls of the first solenoid operated directional valve 81 mouthful of connection with the first solenoid operated directional valve 8, the fluid that guide's hydraulic pump spues can't directly be got back to fuel tank, by overflow valve 6 restriction maximum pressures, the A mouth of test splice 2, the second solenoid operated directional valve 91 mouthful, accumulator 4 and valve body is in pressure state is arranged, and commutation process can be controlled the fuel feeding of pioneer pump thus.

At the first solenoid operated directional valve 8 signal is arranged, 1 mouthful of the second solenoid operated directional valve 9 is under the state that pressure is arranged, when the second solenoid operated directional valve 9 no signal normality, the second solenoid operated directional valve 9 is in left position work under the effect of spring force, and this moment 2 mouthfuls of the second solenoid operated directional valve 9, the second solenoid operated directional valve 93 mouthfuls are communicated with the T mouth of valve body; When the second solenoid operated directional valve 9 has signal, the second solenoid operated directional valve 9 transfers the work of right position to, 2 mouthfuls of solenoid operated directional valve 9 with the second solenoid operated directional valve 93 mouthfuls disconnect, 1 mouthful of the second solenoid operated directional valve 9 with the second solenoid operated directional valve 93 mouthful are communicated with, this moment, the B mouth of valve body was communicated with the pilot pressure hydraulic fluid port, the mineralization pressure loop, commutation process can be controlled the speed of running motor thus.

When the P of valve body mouth had pressure, fluid entered into accumulator 4 through strainer 1 and the first one way valve 3 and carries out topping up, and when the P of valve body mouth during without pressure, accumulator 4 can be used as auxiliary power source to the pilot control system fuel feeding.

Claims

1. hydraulic crawler excavator leading oil source control valve group, comprise strainer (1), overflow valve (6), the first solenoid operated directional valve (8) and the second solenoid operated directional valve (9), it is characterized in that, also comprise test splice (2), the first one way valve (3), accumulator (4) and the 3rd one way valve (7), the P mouth of valve body is connected with strainer (1), strainer (1) respectively with test splice (2), 1 mouthful of the first one way valve (3), 1 mouthful of overflow valve (6) 1 mouthful of connection with the 3rd one way valve (7), test splice (2) respectively with 1 mouthful of the first one way valve (3), 1 mouthful of the 3rd one way valve (7) is connected 6 with overflow valve) 1 mouthful of connection, 1 mouthful of the first one way valve (3) with the 3rd one way valve (7) 1 mouthful is connected, 2 mouthfuls of the first one way valve (3) respectively with 1 mouthful of the first solenoid operated directional valve (8), 1 mouthful of the second solenoid operated directional valve (9) is connected 4 with accumulator) connect, 1 mouthful of accumulator (4) and the first solenoid operated directional valve (8) is connected, 2 mouthfuls of the 3rd one way valve (7) with the first solenoid operated directional valve (8) 3 mouthfuls are connected, 2 mouthfuls of overflow valve (6) respectively with 2 mouthfuls of the first solenoid operated directional valve (8), 2 mouthfuls of the second solenoid operated directional valve (9) are connected the T mouth and are connected with valve body, 3 mouthfuls of the A mouth of valve body and the first solenoid operated directional valve (8) are connected, and 3 mouthfuls of the B mouth of valve body and the second solenoid operated directional valve (9) are connected.

2. a kind of hydraulic crawler excavator leading oil source control valve group according to claim 1 is characterized in that, also comprise the second one way valve (5), the second one way valve (5) is connected in parallel on the two ends of strainer (1).