SU924400A1 - Hydraulic system of mechanized mining roof support - Google Patents

Description

The invention relates to the mining business and is intended for use in the hydraulic drive of mechanized roof supports.

Known hydraulic system mechanized lining, containing a line pressure, drain and control, the control unit with retaining and make-up valves, a hydraulic accumulator in the control line and sectional hydraulic equipment P

The closest to the proposed technical essence and achieved result is a hydraulic roof support, the pressure and comprising a drain line connected to the pumping station, valves, feeding unit with accumulator, check valves, the relay controlled switch with a camera and _m Lenia adjusting spring [2].

A disadvantage of the known devices is that in them the speed of you is. completing work operations on the mount2

This is only determined by the performance of pumping stations. In addition, there may be a decrease in the fastening rate due to a decrease in the charging pressure of the hydroaccumulators.

The purpose of the invention is to increase the efficiency of the system by increasing its efficiency and protecting it against the failure of a hydroaccumulator.

This goal is achieved by the fact that the make-up unit is equipped with a check valve with a valve chamber connected to the accumulator outlet and an over-valve chamber communicated with the control camera of the relay switch.

FIG. 1 shows a schematic hydraulic diagram of the proposed ¹ my system; in fig. 2 - the same, make-up device.

The mechanized support hydraulic system contains a pumping station 1 connected through a pressure head hydroma924400

gistral 2 with safety valve 3 of the hydraulic system, unit 4 make-up and through the valve 5 with executive hydraulic mechanisms, for example with hydraulic legs 6 and hydraulic jacks 7 sections.

The make-up unit 4 consists of a check valve 8 with an over valve 9 and a valve 10 cameras and a relay switch 11 with an adjusting spring 12, control cameras 13, input 14 and output 15. The camera 14 of the input switch 11 is connected to the control camera 13, the pressure line 2 and the sub valve. chamber 10, and the outlet chamber 15 is connected to the valve valve 9 above the check valve 8 and the accumulator 16. The actuating hydraulics 6 and 7 through the distributors 5, the flow line 2 and the drain 17 are connected to the pump 1 and its tank 18.

Relay switch 11 adjustment spring 12 is configured so that at a pressure less than the nominal, it is closed, and when the pressure in the pressure line 2, is equal to the nominal, it opens and connects the pressure line 2 to the accumulator 16.

The make-up units 4, together with the hydraulic accumulators 16, can be mounted on a haulage or ventilation drift or along the lava.

The hydraulic system works as follows.

When turning on the pumping station 1 in the pressure line 2, the working pressure increases. When this check valve 3 is closed, the relay switch 11 is open, with the result that the working fluid in the accumulator 16 does not flow.

When the pressure in the pressure line 2 is equal to the nominal one, the relay switch is set to 1 G, the latter is activated and connects the pressure line 2 to the accumulators 16. These batteries are charged, i.e. the energy of the pumping station is accumulated in the accumulators.

After charging hydroaccumulators 16 and no work in the lava pump station through a safety valve 3 or automatic unloading works on the drain.

When performing any operation, for example, shifting the lining section,

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the pressure in the pressure line is reduced to working, and the relay switch 11 is closed. The working fluid enters the working cavity of the hydraulic cylinder 7 not only from the pumping station 1, but also through the check valve 8 from accumulators 16, as a result of which the speed of the section shifting operation increases by an amount proportional to the flow rate of the working fluid supplied from the accumulators 16.

If, during the execution of the working operation, more pressure is needed than that existing in the hydraulic accumulators at this moment, the latter are disconnected from the pressure ‘line by 2 non-return valves 8, and the pressure increases to the required value due to the discharge of fluid by the pump station 1.

The positive effect from the use of the proposed hydraulic system is to increase the fastening speed and efficiency of the hydraulic drive. This is due to the fact that the make-up unit, made in the form of a check valve with a valve valve and a valve chamber and a relay switch with an adjusting spring and a control chamber, makes it possible to use the energy of a fluid coming from a pressure line, i.e. from the pumping station and from the hydroaccumulators, in which the working fluid accumulates during pauses between working operations, which ultimately leads to an increase in the response speed of the actuators and the efficiency of the pumping station and reduces the required power of the station.

In addition, when the pressure of the accumulator accumulator is reduced or when it is depressurized, it is isolated from the system by means of a check valve.

Claims (1)

Claim The hydraulic system of mechanized roof supports, containing a pressure and discharge lines connected to the pumping station, hydraulic distributors, a make-up unit with a hydraulic accumulator, a hydraulic lock, a relay switch with a control chamber and an adjusting spring, from 924400 6 In order to increase the efficiency of the hydraulic system, the make-up unit is equipped with a non-return valve with a valve valve connected to the accumulator outlet and a valve valve connected to the control chamber of the relay switch.