SU1444534A1 - Externally supplied hydraulic drop - Google Patents

Abstract

The invention relates to mining equipment. The purpose of the invention is to simplify the design of the hydraulic rack and increase the reliability of operation by flushing the channels (K) in the spool of the safety valve. The hydraulic rack stands out of the housing and in the sliding part with the valve body, the piston and the upper nozzle. The valve body is equipped with a discharge valve 6,

Description

SL

yy

4; ai 4: a f

cl

with

4ib

loading device 7 and safety valve. The latter consists of a housing 8 and a spool 9, which is made with radial K 10-12 and deaf axial K 13, 14. Located behind the sealing element 18 on the discharge side and communicating with the input K of the loading device 7. The discharge valve 6 is located at an angle to boot device 7 in the transverse plane. When the rack is loaded and the working resistance is reached, the spool 9 compresses

the spring 16, crosses the radial K 12 sealing element 18, and the liquid from the piston cavity of the rack flows through K 19 and 21 to the drain. Combining the functions of the loading and safety valves in one unit allows us to simplify the design and increase the reliability of the rack. Reliability of operation is achieved by reducing one sealing element and washing the output K of the safety valve. 2 Il.

one

The invention relates to mining equipment, in particular to hydraulic racks with an external feed system for fixing the clearing workings.

The aim of the invention is to simplify the design and ensure reliable operation by flushing the channels in the spool of the safety valve.

FIG. 1 shows the hydrostatic, ka, general view; in fig. 2 shows section A-A in FIG. 1 with the image of the discharge valve.

The hydraulic rack consists of a housing 1 and a sliding part -Z with a valve body 3, a piston 4 and an upper nozzle 5. A discharge valve 6, a loading device 7 and a safety valve consisting of the housing 8 in which the spool is installed are installed in the valve body radial 10, 11, 12 and deaf axial 13 and 14 channels, spring-loaded on one side through the ball 15 by spring 16 and on the other side by spring 17. The tightness of the safety valve is provided by the sealing element 18. Drain the working fluid during operation before hranitelnogo valve is accomplished through a channel 19 in the housing 8, the drain cavity 20 and through a radial passage 21 to the loading device 7.

For spreading and spreading the hydrostatic rack fluid is supplied through the channel.

21 boot device in the drain cavity 20 of the safety valve. Under pressure

shifts, compressing the spring 17, and

the working fluid through the channels 10, 13, 11 is fed into the piston cavity of the hydraulic post. After stopping the supply of pressure, the spool under the action of

the spring 17 returns to its original position and seals the piston cavity of the hydraulic post.

When loading the rack and reaching the working resistance of the spool

safety valve, compressing the spring 16, crosses the radial channels 12 of the sealing element 18 and the liquid from the piston cavity of the rack flows through the channels 19 and

21 to drain

Thus, the combination of functions of the loading and safety valves in a single node allows; significantly simplify the design

the valve block, at the same time, increases the reliability of the rack by reducing one sealing element and flushing the output channels of the safety valve,

moreover, the discharge valve is located at an angle to the loading device in the transverse plane,

Claims (1)

Claims of the invention. External hydraulic rack. - power supply comprising a housing, a sliding part with a piston, a valve block having a loading device, a valve paarpyaouiibtfr and a safety valve with a sealing element and a spring-loaded slide valve, which, in order to simplify the design and increase operational reliability, the safety valve spool is made with deaf axial and radial channels located behind the sealing element of the relief valve of the drain side and communicated with the inlet channels of the loading device, the unloading valve being at an angle to the loading device in the transverse plane. fieL