SU1145148A1 - Hydraulic system of unit of power roof support - Google Patents

Abstract

HYDROSYSTEM OF A MECHANIZED KREPI SECTION, which includes a hydraulic post with a safety valve and a hydraulic lock connected to its piston cavity, a hydraulic valve connected to the piston and rod cavities, a hydraulic unit, an automatic pressure control device, the output of which is communicated through a hygienic valve unit and a hygienic unit, the hydraulic unit, the output unit communicated through a non-return valve with a hydraulic unit. with a hydraulic distributor, pressure and discharge lines connected to the hydraulic distributor, characterized in that, in order to increase the reliability of operation by providing nnogo initial thrust gidrostoyki reguliruemm hydraulic system is provided with a relief valve and a metering device with a hydraulic timer, connected to one tlz Hydraulic distributor lines, which input is connected to the dosing device napor-. and the outlet through a non-return valve to the drive cavity of the automatic pressure boosting device and to the inlet of the relief valve.

Description

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The invention relates to mining, namely to mechanized fastening of the clearing workings.

The hydraulic system of the mechanized roof support section is known, which includes a hydraulic post with a turnkey power switch to it. a piston cavity with a safety valve and a hydraulic lock, a hydraulic valve connected to a piston and rod cavity, a hydraulic block, an automatic pressure reducing device (pressure transducer), the output of which is communicated through a non-return valve to the hydraulic piston cavity, and an input with a hydraulic valve, a pressure and drain line 1 J.

However, this hydraulic system does not provide a stable, predetermined initial thrust of the hydraulic post.

The purpose of the invention is to increase the reliability of operation by providing a predetermined initial thrust of the hydraulic post.

This goal is achieved by the fact that the hydraulic system of the mechanized support section, including a hydraulic post with a safety valve and a hydraulic lock connected to its piston cavity, a hydraulic valve associated with the piston and rod cavities, a hydraulic unit, an automatic pressure increase device, the output of which is communicated through the reciprocal valve with the piston the cavity is hydraulically fit, and the inlet, with the hydraulic distributor, the pressure and drain lines connected to the hydraulic distributor, is equipped with an adjustable bypass valve and doses de- vice hydraulically, time relays, sub, to the exception of one line valve, wherein the inlet of the metering device is connected to the pressure line, and the output - via a check valve to the actuating device an automatic cavity pressurization, and entry of the overflow valve.

The drawing shows the principal hydraulic diagram of the hydraulic system of the mechanized support section with a longitudinal section of the metering device.

The hydraulic system includes a hydraulic post 1, the piston and rod cavities 2 and 3 of which are connected by hydraulic lines 4 and 5 to the safety valve 6 and the hydraulic lock 7 of the hydraulic unit 8,

automatic pressure boosting device 9 with low and high pressure check valves 10 and 11, metering device 12 with hydraulic time relay, adjustable bypass valve 13, hydraulic distributor 14, pressure and drain lines 15 and 16. The dosing device consists of a housing 17 in which a piston 18 with a calibrated orifice 19 and a check valve 20, a pusher 21, a rod 22, a piston 23 of the control and a non-return valve 24. The piston 18 moves in a closed chamber 25 filled with a liquid of viscosity. The valve 14 is connected to the hydraulic unit 8 by hydrolines 26 and .27, and to the control cavity of the metering device 12 by a line 28. The over valve valve 29 of the metering device 30 is connected to the pressure line 15 by line 30, and the subvalvate cavity 31 by lines 32 and 33 to the device inlet 9 of the increase in pressure and the adjustable relief valve 13. The output of the device to increase the pressure by line 34 through the lock 7 is in communication with the piston cavity 2 of the hydraulic post 1.

The hydraulic system works in the following way.

When installing the hydraulic distributor 14 to position 1, the working fluid from the pressure line 15 is supplied to the rod end 3 of the hydraulics 1 and the relief and reduction of the hydraulics takes place in the control chamber of the hydraulic lock 7. To automatically set the required initial thrust of the hydraulic post after moving the lining section, the hydraulic valve is briefly set to position I. - fluid from the pressure line 15 flows under the piston 23 of the metering device 12, which acts through the rod 22, the piston 18 and the pusher 21 on the locking element of the valve 24 and opens it, while the working fluid from the pressure line 15 through line 32 through the open valve 2A enters the inlet of the pressure control device 9 and the adjustable bypass valve 13. After e inclusion short distributor 14 is set to the neutral position and the control chamber of the metering device 12 communicates with the drain line 16. The piston 18 under dav3P45

The operating fluid is lowered to the pusher 21 with a delay in time due to the flow of fluid through the calibrated orifice 19. The pressure control device works until the check valve 24 is closed. To limit the limit value of the high pressure created by the device in the piston cavity 2 of the hydraulic post 1, the pressure on its input is by-pass valve 13. Duration of operation of the metering device with a time relay, determined by the viscosity of the fluid in the cavity 25, with a cross section of a calibrated orifice 19 in the piston 18 and adjustment of the stroke of the locking zlementy valve 24 is set so as to extending through the dispensing of liquid volumes device provided extendable and uniform pressure to the thrust setting 13 klapaka. all gidroeek 1 in lava. For manual control of the hydraulic post thrust up to the pressure generated by the pump station, the hydraulic distributor 14 is provided with a 1JJ position.

The proposed hydraulics of the mechanized roof support section provides improvement of the roof in the mining face due to the automatic setting of a high uniform initial thrust of the girders and an increase in the fastening rate of the lava by reducing the execution time of the thrust operation.

Claims (1)

HYDRAULIC SYSTEM OF THE MECHANIZED FASTENING SECTION, including a hydraulic stand with a safety valve and a hydraulic lock connected to its piston cavity, a hydrodistributor associated with the piston and rod cavities, a hydraulic unit, an automatic pressure increase device, the output of which is communicated through a check valve with the piston cavity of the hydraulic stand, and with a control valve, pressure and drain lines connected to the control valve, characterized in that, in order to increase the reliability of work by ensuring the specified the initial spread of the hydraulic rack, the hydraulic system is equipped with an adjustable bypass valve and a metering device with a hydraulic time switch connected to one of the lines of the control valve, and the input of the metering device is connected to the pressure head. main line, and the output through the check valve to the drive cavity of the automatic pressure boosting device and to the inlet of the bypass valve. J 1145148> 1 145148