SU730970A1 - Powered roof support hydraulic control system - Google Patents

Description

one

Invented in the mining industry. industry, in particular to the fastening of the bottom of coal mines, and is intended to control the bottomhole complex of unprofitable dredging.

The hydraulic control system of a mechanized lining is known to contain, and a hydrocyliidr stand, a hydraulic shift of movement of the conveyor and a metering cylinder, the working cavity of which is communicated with the rodless cavity of the hydraulic jack with a udapovlein hydraulic lock, and the charging line - with a single lock, with a hydraulic lock, and a power line - with a single lock and a lock, and a power line with a hydraulic lock, and a power line with a hydraulic lock with a udapovlein to a hydraulic lock;

The disadvantage of this hydraulic system is that when charging the metering cylinder, a high pressure cut off by a hydraulic lock is developed before the working stroke of the plow in the working cavity of the metering cylinder. When you follow the conveyor to the bottom, it is necessary to open the hydraulic lock, the supply of pressure is significantly higher than the pressure required to open the hydraulic lock in normal conditions.

In addition, during the landing of a roll of n-tangenn to its conveyor, the displaced liquid from the cavities of the hydraulic jack of the second arm of the hydraulic racks passes through the same hydraulic lock, which increases the time for shifting the lining.

The aim of the invention is to improve the reliability of the hydraulic system.

This goal is achieved by the fact that the rodless cavity of the hydraulic jack is additionally communicated with the hydraulic charging line with the successively installed hydraulic lock and non-return valve, and an additional one-way non-return valve is installed in the hydraulic shaft of the mentioned cavity and working cavity of the metering cylinder.

The drawing shows the hydraulic control system of a mecha fixture. The hydraulic system contains a hydraulic cylinder 1

15 pillars, hydraulic jack 2 movements of the conveyor 3 and the metering cylinder 4. The working cavity 5 of the metering cylinder 4 communicates with the rodless cavity 6 of the hydrodynamic cylinder 2 2, in which

20, a hydraulic lock 8 and a check valve 9 are installed. The cavity 5 is also connected to the charging line 10 with the hydraulic line I and with the non-return valve 12, and the cavity 6 with the hydraulic line 13 with the series-installed X

25 mi hydr. Mc 14 and a check valve 15. Beshtokova cavity 16 and the rod cavity 17 gpdrotsnlpndra 1 communicated with lines 10 and 18, respectively, hydrolips 19 and 20, to which are connected the safety valve 21 and the hydraulic lock

22. The rod end 23 of the hydraulic cylinder 2 is connected to the main line 18 by the hydroline 24, and the cavity 25 of the metering cylinder 4 is connected to the main line 26 by the hydroline 27. The hydraulic jack 2 is connected to the conveyor 3 by means of a piston 28. 28. The displacement of the working fluid from the metering cylinder 4 is carried out by means of 29 .

The hydraulic actuator works as follows.

When pressure is applied to the line 10, it is transmitted via the hydroline 19 to the hydraulic lock 22, through which the liquid enters the gearless flow. the cavity 16 of the hydraulic cylinder 1 rack, its gap between the roof and the soil of the lava. At the same time, the fluid from the line 10 through the check valve 12 through the hydroline 11 enters the working cavity 5 of the metering cylinder 4, moving the shaft 29 to the extreme position, thus preparing the complex advancement shaft. Expelled by the piston 29 from the cavity 25, the fluid through the hydroline 27 goes into the main line 26 to drain. When this lock 8 is locked, and the liquid in the hydraulic jack 2 does not flow. After the coal is removed from the bottom to the depth of the stop, the complex is moved. First, conveyor 3 is moved, for which fluid under pressure is iodized to line 26, from which, via hydroline 27, it enters the cavity 25 of the metering cylinder 4. At the same time, the fluid enters the hydraulic lock 8 and opens it.

The liquid removed from the working iolith 5 by the piston 29 through the open hydraulic lock 8, the check valve 9 through the hydroline 7 enters the rodless cavity 6 of the hydraulic jack 2, moving the jib 28, the movement of which is conveyed to the conveyor section 3. Hydraulically displaced from the hydraulic cavity 23 of the hydraulic jack 2 24 goes to the drain in the highway 18.

When the conveyor 3 is squeezed from the intake, the fluid from the stemless iolost 6 of the hydraulic jack 2 cannot be forced out, since the closed hydraulic lock 14 and non-return valve 9 prevent this, i.e., regardless of

applied to the conveyor 3 force, it will not change its position relative to the bottom. To move the rack to the conveyor.

the pressure is fed to the line 18. At the same time, the fluid through the hydroline 20 enters the schtokovy cavity 17 of the hydraulic cylinder 1 and simultaneously opens the hydraulic lock 22. The stand starts, and displaced from the hydraulic cylinder-less 16 of the hydraulic cylinder 1 through the hydraulic line 19 and through the open hydraulic lock 22 goes to the drain line 10. At the same time, the liquid from line 18 enters via a hydroline 24 into a pinch

the cavity 23 of the hydraulic cylinder 2 and to the hydraulic lock 14, opening it. In this case, the hydraulic jack 2 moves to the conveyor 3, the hydrocyliidr 1 is pushed up, and the displaced liquid is moved out of the stemless 6.

the hydraulic jack 2 through the hydraulic lock 14 and the check valve 15 is drained to the main line 10. Then pressure is applied to the main line 10, and the cycle is repeated.

Claims (1)

1. USSR Author's Certificate No. 470617, cl. E 21 C 27/32, 1972.