SU454351A1 - Charger for external hydraulics - Google Patents

Description

one

The invention relates to mining and can be used for lining cleaning faces.

Chargers are known for external hydraulics, including a hydraulically balanced connection unit, a multiplier with high and low pressure chambers, a spring-loaded spool valve, fittings, a check valve and a valve.

The aim of the invention is to increase the speed and magnitude of the initial strut expansion.

This is achieved by the fact that the charging device is equipped with a shut-off element, made in the form of a floating piston, which is located in the chamber with end fluids from high-pressure chambers.

The drawing shows the structural scheme of the proposed charging device.

The charging device consists of a housing 1 in which a differential piston 2 of double action is installed, made in the form of a three-position plunger and forming 3, 4 and low 5, 6 high-pressure chambers isolated from one another, with two slide valves , a spring 8, a check valve 9, a floating piston 10 mounted in the cylindrical chamber 11, and

a hydraulically balanced connection unit 12 with an annular groove 13, a channel 14 and a valve 15 for communicating through the chamber 11 and the channel 16 with the valve cavity. In the housing 1 there are main fittings 17 and 18 for supplying and for draining the working fluid. The fittings are hydraulically connected by channels 19 and 20, respectively, to the annular grooves 21 and 22 of the distributor 7. The distributor 7 communicates with channels 23-31 with various chambers and piston cavities 2, and channels 32 and 33 with the cavities of the ends of the floating piston 10. Differential piston 34 is connected to

subvalvular valve cavity 9. The chamber 11 is made with an annular groove 35. The force of the spring 8 is less than the axial force acting on the distributor 7 when the working fluid is fed into its face cavity under pressure,

developed maslostantion.

Charging device operates as follows.

In the initial position, the valve 15 is closed. A hydraulically balanced connection unit 12 charging device is connected to

working cavity of the hydraulic rack

external power supply (not shown).

After opening the valve 15, it enters

housing 1 through fitting 17 working fluid

under pressure through channel 19, groove 21,

channels 26 and 34, valve 9, channel 16, groove 35, valve 15, channel 14 and the annular groove 13 enters the working cavity of the hydraulic cylinder. At the same time, from the distributor 7, through channels 24 and 25, the pressurized fluid flows into the chambers 6 and 4 of the piston 2, respectively, and through channel 28 from the piston 2 into the cavity of the right end of the distributor 7. With the extension of the expandable stand into the roof and the pressure increases to provided by the pressure station, the axial force acting on the distributor 7 from the right end, compresses the spring 8 and moves the distributor to the extreme left position. In this case, the channels 27 and 30, as well as the chambers 3 and 5. Appear to be under pressure, the chamber 6 through the channels 24 and 20 communicates with the drain, and the chamber 4 is separated by the distributor 7.

By the action of the working fluid entering chambers 3 and 5, the piston 2 is displaced to the left, displacing the fluid from chamber 4 through channel 32 to chamber 11. Porsche 10 is displaced to the right and opens the passage of fluid to channel 14 and further to the hydraulic column. In this position, the piston 2 fluid under pressure through the channels 26 and 23 enters the cavity of the left end of the distributor 7. The cavity of the right end through the channels 28, 31, 29 and 20 communicates with the drain. The distributor 7 under the action of the compressed spring 8 and the pressure of the liquid on the left end surface moves to the right as far as it will go. With this arrangement, the piston 2 and the distributor 7 of the floor 5 through the channels 30 and 20 are connected with the drain, the cavity 3 and the channel 27 are isolated along the distributor, and the cavities 4 and 6 through the channels 24, 25 and 19 are connected to

pressure line. The piston 2 under the action of axial unbalanced forces is displaced to the right, the liquid is displaced from the cavity 3 through the channel 33 into the chamber 11. The piston 10 is displaced to the left, and the liquid from the chamber 11 through the channel

14 enters the working cavity of the hydraulic column cylinder. After the piston 2 is changed to the extreme right position, the moving elements of the charging device occupy the initial position.

The differential piston will operate until the pressure of the working fluid in the hydraulic cylinder is increased to a predetermined value.

Subject invention

A charging device for a hydraulically external supply, including a hydraulically balanced connection unit, a multiplier with high and low pressure chambers, a spring-loaded spool valve, valves, a check valve and a valve, characterized in that, in order to increase the speed and magnitude of the initial

the rack is spread, it is provided with a shut-off element, made in the form of a floating piston, which is placed in a chamber with end fluids from high-pressure chambers.

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