SU939845A1 - Power roof support hydraulic system - Google Patents

Description

(54) HYDROSYSTEM OF MECHANIZED STRIP

one

The invention relates to a shaft-mounted reinforcement and is intended for use in the coal industry. The mechanized hydraulics are known: lining, containing injection and discharge hydraulic lines, at least two lining sections, each of which contains rack hydraulic cylinders, whose rod and non-current cavities are communicated through a hydraulic distributor with puffing and draining valves 1.

The known hydraulic system does not use the effect of rock pressure on the hydrocall.

The purpose of the invention is to increase the efficiency of a hydraulic system by using hydraulic power that is obtained as a result of the effect of rock pressure on the rig and increase the fastening rate of the lava.

This goal is achieved by the fact that each lining section is provided with hydro-adjustable spring-loaded shut-off valves, wherein the rodless hydraulic cylinder is connected to one of the control cavities and to the inlet of the first shut-off valve, one of

strokes of which are communicated with the injection line through the second shut-off valve, and the other outlet is connected to the inlet of the second shut-off valve and through the safety valve to the pinhole of the hydraulic cylinder.

. The drawing shows a schematic diagram of the hydraulic system.

The hydraulic system contains 1 pressure and 2 injection piping, hydraulic injection 3 drain, hydraulic cylinders 4 and 5 racks, hydraulic jack 6 movement. The rod cavities 7 and 8 and rodless cavities 9 and 10 of the hydraulic cylinders 4 and 5 are communicated through the valve 11 with the solid lines. 2 and 3. Bestokova cavity

Claims (1)

 The 9 cylinders 4 communicate with the control chamber 12 of the shut-off valve 13 n with the inlet 14. The output 15 communicates with the input 16 of the shut-off valve 17, the control cavity 18 of which is connected to the hydraulic line 1. The output 19 of the valve 13 is connected to the input 20 of the valve 17 and through the safety valve 21 with a shpatkovoy cavity 7. Hydrolics 1 communicates with hydroline 2 through a fuse 393 valve 22. The lining section contains hydraulic locks 23 and 24. Valve 13 has a spring 25, and valve 17 has a spring 26. The hydraulic system works as follows. If there is a working fluid injection pressure in the hydroline I equal to the nominal value in the cavity 9 of the hydraulic cylinder 4, the working fluid to the injection hydraulic line 1 is supplied, for example, from a multiplier through a non-return valve, which (not shown), the valve 17 moves to the right (according to the drawing) and the working fluid from the hydroline 1 enters through the valve 13 and 17 into the cavity 9 of the hydraulic cylinder 4, the valve 13 is also in the right position when there is pressure in the cavity 9. When exposed to rock pressure, the pressure in the cavity 9 of the hydraulic cylinder 4 and working fluid from cavity 9 is expelled through valves 13 and 17 into hydraulic line 1 from which it enters another lining section (not shown), in which the pressure is lower than nominal. If the pressure of the working fluid in all sections is equal to nominal, then the working fluid through safety valve 22 enters hydraulic line 2, the pressure of which is lower than the pressure in hydroline 1. The working liquid in hydraulic line 2 comes from the power supply unit, for example, pump of constant feed with automatic pump unloading and hydraulic accumulator (not shown). The working fluid supplied to the hydroline 2 from the hydroline I as a result of the influence of the mountain pressure enters either the hydraulic elements that perform the working operations, for example, the hydraulic hydraulic jack 6, or the charging of the hydraulic accumulator (not shown). When the thrust is removed, the working fluid under pressure from the hydroline 2 forcing through the valve 11 enters the brush cavity 7. From the cavity 9, the working fluid is discharged through the shut-off valve 13, which is in the left position (according to the drawing) and then through the hydraulic lock 23, the valve 11 hydroline 3 plum. After removing the thrust, the pressure in cavity 9 is equal to the pressure of the drain or the supporting pressure (if there is a backwater system). The valve 13 is in the left position and the valve 17 is in the right position. The racks are deployed as follows. From the hydroline 2, the working fluid enters through the hydraulic distributor 11, hydraulic lock 23, shut-off valve 13 into the cavity 9 of the hydraulic cylinder 4. When the preload pressure control is reached in the cavity 12, to which the spring 25 of the valve 13 is adjusted, the latter is retracted to the far right the position and into the cavity 9, the working fluid enters from the hydrolines 1. The hydraulic cylinder 4 expands and operates at nominal pressure, i.e., the speed of the working operations increases and operation is ensured in minal mode. The work of the hydraulic cylinder 5 is similar to the work of the hydraulic cylinder 4. Similarly, other sections of the lining work. Dania hydraulic system protects the pillars from unloading at loss of tightness by any hydraulic element. When the pressure in the hydroline 1 drops below the nominal value, the valve 17 is moved to the left position by the action of the spring 26 and the cavity 9 is isolated from line 1 and communicates with the safety valve 21. With the loss of tightness of the hydro cylinder 4, the pressure in the cavity 9 drops and the valve 13 moves to the left, isolate the hydroline 1 from the cavity 9 and connect the latter with the safety valve 21. Thus, the proposed hydraulic system provides not only the use of hydraulic energy as a result of the drawdown of the stand under the action Mining iem pressure, but also increases the speed of performing working operations, as well as hydraulic povyschaet reliability. Claims of the invention A hydraulics system for mechanized support, containing injection and discharge hydrolines, at least two sections of support, each of which contains rack hydraulic cylinders, the throat and stemless cavities of which are communicated through a hydraulic distributor with injection and drain hydrolines, and a safety valve, different from TCiM, , in order to increase efficiency, each lining section is equipped with two hydraulically controlled spring-loaded shut-off valves, while the axleless hydraulic cylinder cavity is in communication with one of the control cavities and with the inlet of the first shut-off valve, one of the outlets of which communicates with the discharge line through the second shut-off valve, and the other outlet is connected to the inlet of the second shut-off valve and through the safety valve - with (hydraulic cylinder cavity). Sources of information taken into account during the examination I USSR Copyright Certificate No. 448298, CL F 21 D 23/16, 1971. nSWIF V