SU1320442A1 - Mine machine hydraulic system - Google Patents

Abstract

The invention relates to hydraulic actuators and makes it possible to increase the reliability of the control device. Each block 10, 11, 12 of the pressure setting contains a controlled check valve (K) 16, 17, 18, the control cavity to-ry communicated with the pressure 5 and drain 6 hydraulic lines. In parallel, K 16, 17, 18, K 13, 14, 15, pressures are installed, and two-position three-way distribution spools 19, 20, 21 are connected to the control unit. Safety pressures K 9 and K 13, 14, 15 of the pressure of each unit 10, 11, 12 are connected in series. Hydraulic resistance K 16, 17, 18 is less than resistance K 13, 14, 15 pressure, which makes it possible to adjust the pressure in the pressure hydroline by 5 different combinations of K switching. 2 Il. 1СЛ СО ГЧЭ О 4 Ю FIG. 2

Description

I

The invention relates to devices for controlling the hydraulic drive of mining machines and may find application in the mining industry.

The aim of the invention is to increase the reliability of control.

FIG. 1 shows the control circuit of the hydraulic system of a mining machine; in fig. 2 - block wiring diagram

If it is necessary to change the pressure in the pressure line 5 (depending on the geological conditions), a control signal is generated from the control unit 8.,. . ,

The hydraulic control unit is set to one or more (depending on

The mining machine contains a pump-mill from the required pressure in the pressure hydraulic 1, hydraulic jacks 2 advances, co-lines 5) of hydraulic distributors 19-21, adjusted through valves 3 and 4 with loading them into the position providing

borehole and drainage hydrolines 5 and 6 pump-sided cavities with hydroline, i.e., station 1, power supply 7, cover of one or more valves

control block 8, safety valve 16-18, hydraulic resistance of canlanan 9 and pressure setting blocks 10-12,

13-15 pressure valves include

Equivalent check valves 16-18 and

The two-inoziopic three-line hydrostatic is less than the pressure resistance of valves 13-15. Thus, the flow of the working fluid when the valves 16-18 open passes through them, bypass the valves 13-15

the limiters 19-21 connected to the pressure unit 20, providing pressure in the pressure

8 control The safety valve of hydroline 5, is determined by the total pressure and the valves 13-15 are installed in series and set to pressures determined by the following relationship:

the construction of the remaining 13, 14 or 15 pressure valves.

R ,

Where

P „-pressure setting and

the pressure of the pressure setting p-unit p, the pressure setting of the pressure valve of the first pressure setting unit;

n is the order number of the pressure setting block in the sequential row. The controlled check valves 16-18 are installed parallel to the valves 13-15, and the control cavities of the valves 13-15 are connected to the pressure and drain hydraulic lines 5 and 6 via the hydraulic distributors 19 21. The pressure valve 15 of the last pressure setting unit 12 is connected to the drain hydraulic line 6.

The control unit of the hydraulic system of the mining machine works as follows.

In the initial position, the control signal from the control unit 8 is not applied, the control cavities through the hydraulic distributor 1320442

dividers 19-21 are communicated with drain hydroline 6, and valves 15-17 are closed. The working fluid passing through successively installed 13-15 pressure valves provides the maximum pressure in the pressure line 5.

If it is necessary to change the pressure in the pressure line 5 (depending on the geological conditions), control block 8 is supplied with a control signal. . ,

cash on one or more (depending

16-18, the flow resistance of which is less than the pressure resistance of the valves 13-15. Thus, the flow of the working fluid when the valves 16-18 open passes through them, bypass the valves 13-15

line 5 is determined by the total setting of the remaining 13, 14 or 15 pressure valves.

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Claims (1)

Invention Formula The hydraulic system of the mining machine, which contains a pumping station, hydraulic outlets, communicated with a pressure and drainage lines from a pumping station and a control device including a power source, a control unit, a safety valve and pressure setting units, are interconnected .to my non-return valve, pressure valve and two-way three-way valve connected to the control unit, with this control cavity of the non-return valve communicating with the pressure and drainage hydraulics not through 40 distribution valve, characterized in that, in order to increase reliability, the safety valve and the pressure valves of each block are connected in series, and the check valve of each block is installed parallel to its valve pressure pressure.