SU1303727A1 - Hydraulic system of pumping station of power support - Google Patents

Abstract

The invention relates to mining machinery, improves the reliability and durability of a pumping station. For this purpose, the hydraulic system of the mechanized support pumping station includes a choke 9 and a retaining valve (PC) AND connected in parallel by a line 26 of communication with a low pressure discharge lines 23 and 6 and successively through a filter 8 with a high pressure pressure line 5. The adjusting pressure of the PC 11 exceeds the adjusting pressure of the reducing valve 10. When the reduced pressure is reached in the discharge line 6 of a certain pressure level, to which the reducing valve 10 is adjusted, it moves to the closed position. Fluid through line 21 through filter 8, line 22 and throttle 9 enters line 26 and through line 23 into line 6. Pressure in line 6 is determined by the setting of PC 11. The throughput of throttles 9 depends on the pressure drop determined by the difference between the working pressure in line 5 and setting up the PC 11, and from the plate, go through the cross section of the throttles 9. When moving the moving elements of the hydraulic cylinders at higher speeds, the entire fluid flow from the high-pressure pumping unit 3 flows through the reducing valve 10 into the line 6. Therefore, the reduction The oning valve 10 operates in a discrete mode, which reduces its effect on the locking elements and increases durability. 1 il. € (L with about with

Description

The invention relates to coal mechanical engineering and can be used in the hydraulic drive of mechanized roof supports mainly there, along with the high pressure line, a reduced pressure line is required, for example, to create an active backwater when shifting sections of the mechanized roof supports.

The purpose of the invention is to increase the reliability and durability of the pumping station.

The drawing shows the hydraulic circuit of the proposed device.

The hydraulic system includes tank 1, subsurface group 2, high-pressure setpoint 3, discharge group 4-6 (high and low pressure discharge lines), functional group 7 for organizing, selecting and maintaining reduced pressure with filter 8, throttle 9, pressure reducing valve 10, a low flow retaining valve 11 and a high flow safety valve 12 with a drain line 13-15 (suction and discharge line of the feed group), discharge line 16 of the feed grinder, discharge line 17 of a high-pressure pumping unit, connecting line 18 for supplying a high pressure to the discharge group to the line 4 and 5. Furthermore, the hydraulic system includes a drain line 19 from the unloading of group 4, line 20 for supplying reduced pressure to the relief valve 12, lines 21-26 communication drain line 27-28. The throttle 9 and the retaining valve 11 are connected in parallel via a communication line 26 to the reduced pressure injection lines 23 and 6 and in series through the filter 8 to the high pressure injection line 5.

The setting pressure of the reducing valve 10 is lower than the setting pressure of the retaining valve 11.

The device works as follows.

During the operation of the pumping station, the liquid is sucked from the tank 1 to the feed group 2, and via the discharge line 15, the feed load enters the suction of the high-pressure pumping unit 3. Excess fluid through the line 16 is drained into the tank 1.

From the pumping unit 3, fluid along lines 17, 24 and 5 is injected under high pressure into the hydraulic support system. At the same time, on line 24, the liquid is brought to the functional group 7 of the organization, selection, and the Dder’s reduced pressure pressure station. Through line 21, the liquid simultaneously flows through the filter 8 and the throttle 9 to the low-pressure stop valve 11, and via the lin1-: and 25 to the reducing valve 10.

The setting of the retaining valve 1 1 by 15–20 kgf / cm exceeds the setting of the valve 10. Liquid through the reducing valve 10 enters the lines 23 and 6 of the injection of reduced pressure.

When a reduced pressure is reached in the injection line 6 of a certain pressure level, namely, the one to which the reduction valve 10 is adjusted, is moved to the closed position. In this case, the fluid through line 21 through the filter 8, line 22 and the throttle 9 enters the communication line 26 and then, via LINE 23, into the reduced pressure injection line 6.

In this mode, the pressure in line 6 is determined by the setting of the low flow retaining valve 11. Bandwidth capacity

The throttle 9 depends on the pressure drop determined by the difference between the working pressure in line 5 and the setting of the retaining valve AND, as well as on the area of the throttle cross section 9.

Thus, it is possible to choose the capacity of the throttles 9 such that the flow rate of fluid flowing through it is sufficient to compensate for the leaks in line 6 and keep it at the required pressure level. The excess fluid fi this is drained through a retaining valve 11

and line 27 to tank 1.

If you need to perform high-speed operations to move the movable racks hydraulic cylinders associated with a rapid increase in their hydraulic cavities,

the entire fluid flow from the high-pressure pumping unit 3 flows through the pressure reducing valve 10 into line 6, thereby ensuring a high movement speed.

After the completion of displacement operations, the pressure in line 6 increases to the value of the setting of the retaining valve 11, which results in the closing of the pressure reducing valve 10, the operation of the retaining valve 11, which, when the pressure reducing valve 10 is closed, provides the required pressure without movement or low movement. elements of hydraulic cylinders support and related changes in their hydraulic cavities. Thus, the reduction valve 10 operates in a discrete mode, which significantly reduces the impact on its shut-off elements of the working and pressure drop, and therefore increases the durability. The retaining valve 11 is under the differential pressure drop only, which increases its reliability and service life.

Claims (1)

Invention Formula The hydraulics of the pumping station of mechanized roof support, including a high-pressure pumping unit connected with a make-up group and a discharge group, a pressure reducing valve connected 1303727d between the high-pressure line for high-pressure generation with each other and the connected nor a pumping installation and a suction line between the high pressure line of the reduced pressure, to which the fuse valve is connected to the fuse line and the safety valve from the linear valve, while the choke is single drain, which in order to temporarily connect the reduction of reliability and durability of a valve, whose pressure setting pine station, it is equipped with a choke and a pressure adjustment valve retaining valve connected to the post-pan.