CN1336547A

CN1336547A - On-line monitor for pollution in hydraulic system oil liquid

Info

Publication number: CN1336547A
Application number: CN 01122214
Authority: CN
Inventors: 张齐生; 赵静一
Original assignee: Yanshan University
Current assignee: Yanshan University
Priority date: 2001-06-15
Filing date: 2001-06-15
Publication date: 2002-02-20

Abstract

The invention relates to detecting pollution degree caused by oil to hydraulic system. The characteristics of the equipment are as follows. The direct current magnetic irons used in valve is connected to piston module of special hydraulic cylinder. The revolving measuring head is installed in cavity at the upper of specialy hydraulic cylinder. There is a through hole with ladder shaped. The mesh filter and holding down device are installed in the hole. The invented equipment is also to online monitor the degree of pollution caused by oil. It gives alerting signal when the pollution is exceeded over limit.

Description

On-line monitor for pollution in hydraulic system oil liquid

The invention belongs to the oil contamination in hydraulic system detection range.

According to statistics, the fault of hydraulic system have at least 75% since fluid and pollution thereof cause.Oil contamination in hydraulic system is very serious to hydraulic system, influence and harm that element and hydraulic oil produced.Therefore, how to eliminate and reduce oil contamination, improve the contamination resistance of Hydraulic Elements, prolong Hydraulic Elements serviceable life, improve the functional reliability of hydraulic system, no matter from the angle of academic significance and technical meaning, still from the angle of economic benefit, all be crucial.

Existing oil contamination detection technique, as: the microscope inspection survey technology, automatic particle collector detection technique, analyzing iron spectrum technology, spectral analysis technique etc., though higher accuracy is arranged, but all, strict to testing environment because of technical too strong, the expense height of purchasing and analyzing, the factors such as the time is oversize of test all can not be applied to the on-line monitoring of oil contamination at large.Now, the various automatic particle collector on the market all because of costing an arm and a leg, and can not be widely used in on-the-spot hydraulic system.

The object of the present invention is to provide a kind of on-line monitor for pollution in hydraulic system oil liquid of practicality, this device can be in the process of hydraulic work system on-line monitoring go out the class of pollution of fluid, can realize functions such as demonstration, storage, printing, when oil contamination transfinites, and can provide alerting signal, remind operating personnel in time to take measures to prevent the generation of major accident.

This on-line monitor for pollution in hydraulic system oil liquid, comprise valve DC electromagnet 1,9, linkage 15,10, compositions such as stepper motor 2 and microcomputer, it is characterized in that: valve is connected with the piston component 14 of specially made hydraulic cylinder 12 respectively by linkage 15,10 with DC electromagnet 1,9; Two oil circuits 13 of two ends, bottom processing and 11 of the lower cavity of specially made hydraulic cylinder 12, the pipeline of these two oil circuits and monitored hydraulic system is connected, and wherein in the oil circuit 11 retaining valve is installed; Rotary measuring head 3 is housed in the upper chamber of said specially made hydraulic cylinder 12, and rotary measuring head 3 has a through hole and oil circuit 5 and oil circuit 7 to being communicated with, and its axle head is installed stepper motor 2; Above-mentioned through hole be one with the perpendicular stepped through hole of the axis of rotary measuring head, filter screen 4 and hold down gag 6 are equipped with in the inside, oil circuit 7 is connected with the upper chamber and the lower cavity of specially made hydraulic cylinder 12, and is connected with oil circuit 8; Connect differential pressure pickup respectively on oil circuit 5 and the oil circuit 8, temperature sensor is installed on the filter screen 4, and differential pressure pickup, temperature sensor and valve are connected on the interface of microcomputer with the electrical connector of DC electromagnet 1,9.

Drawings and Examples:

Fig. 1 is the on-line monitor for pollution in hydraulic system oil liquid structural representation

Fig. 2 is the rotary measuring head structural representation

Accompanying drawing 1 is an embodiment (see figure 1) disclosed by the invention, oil circuit 13, oil circuit 11 are connected with the pipeline of monitored hydraulic system, during work, are loaded on the temperature that the preceding temperature sensor of filter screen at first detects fluid, when the oil temperature was low or too high excessively, this device was not worked.When the oil temperature is in the design temperature scope, valve DC electromagnet 1 (+), 9 (-), specially made hydraulic cylinder 12 oil suctions; Stepper motor 2 clockwise rotates 90 °, for test is prepared; Valve DC electromagnet 1 (-), 9 (+), specially made hydraulic cylinder 12 oil extractions; The time-delay certain hour, data acquisition and control card collection are loaded on the electric signal that the differential pressure pickup of special filter screen 4 front and back is converted, by filtering, calculation process, draw the pressure reduction of special filter screen front and back, and table look-up and find out corresponding contamination level of oil liquid value, then the contamination level of oil liquid value is sent display to show, and printable output; Stepper motor 2 clockwise rotates 90 °, sealing liquid cylinder pressure 12; Valve DC electromagnet 1 (+), 9 (-), specially made hydraulic cylinder 12 oil suction once more is for counterflush filter screen 4 is prepared; Stepper motor 2 clockwise rotates 90 °; Valve DC electromagnet 1 (-), 9 (+), the special filter screen of counterflush; Stepper motor 2 clockwise rotates 90 °, sets back.If when the contamination level of oil liquid value does not meet the place system requirements, this oil liquid pollution on-line monitoring device will send alerting signal.

Claims

1, a kind of on-line monitor for pollution in hydraulic system oil liquid, comprise valve DC electromagnet (1), (9), linkage (15), (10), compositions such as stepper motor (2) and microcomputer, it is characterized in that: valve DC electromagnet (1), (9) by linkage (15), (10) be connected with the piston component (14) of specially made hydraulic cylinder (12) respectively, in the cavity on the top of specially made hydraulic cylinder (12), rotary measuring head (3) is housed, there is oil circuit (7) to be connected between the cavity of this cavity and specially made hydraulic cylinder (12), the oil circuit (13) of specially made hydraulic cylinder (12), (11) and the pipeline of monitored hydraulic system be connected.

2, on-Line Monitor Device according to claim 1 is characterized in that: rotary measuring head (3) has a through hole to be connected with oil circuit (5) and oil circuit (7).

3, according to claim 1,2 described on-Line Monitor Device, it is characterized in that: the through hole of rotary measuring head (3) is the stepped through hole perpendicular with axis, and filter screen (4) is equipped with in the inside, hold down gag (6) and temperature sensor.

4, on-Line Monitor Device according to claim 1 is characterized in that: oil circuit is equipped with retaining valve in (11).

5, on-Line Monitor Device according to claim 1 is characterized in that: oil circuit (8) is communicated with earlier with oil circuit (7), and it and oil circuit (5) are installed differential pressure pickup respectively.

6, on-Line Monitor Device according to claim 1 is characterized in that: differential pressure pickup, temperature sensor and valve are connected on the interface of microcomputer with the electrical connector of DC electromagnet (1), (9).