SU699197A1 - Hydraulic prop charging and extending device - Google Patents

Description

one

The invention relates to the cleaning of bottom holes in underground coal mining, and specifically to devices for charging hydraulic racks of external power.

A pistol for mine hydraulic racks is known, having a housing, a bracket, a locking element and a control handle l.

The disadvantage of such a gun is the low reliability in operation and the creation of an insufficient installation thrust determined by the pressure in the hydraulic trunk.

A charging device and hydraulic struts are known, having a body in which a piston with a rod is placed, forming low and high pressure chambers, a valve with a spring-loaded spool, a control handle with a connecting socket and channels for connecting low and high pressure chambers and a drain channel 2.

2

The disadvantages of this device are low reliability of the operation of the distributor, increased wear of the working surface of the rod due to the fact that the NTO is constantly in its extended position, the labor is high1; Take it easy to remove the pistol: the inconvenience of working with a gun.

The purpose of the invention is to increase reliability, ease of use and reduce the complexity of work.

Claims (1)

This is achieved by the fact that the connecting socket is scrolled in the control handle, and the distributor is made three-fold with an eccentric spring-loaded spool that is connected to the low and high pressure channels by means of a distribution seat with the channels, and the high pressure channel is connected to the distribution channel saddles by means of a check valve. The drawing shows a device for charging and spreading hydraulic racks, a longitudinal section. The device has a housing 1, a rod 2 and a distributor 3. On the housing 1 there is a connecting pipe 4, which connects through channel 5 and a check valve 6 with a distributor seat 7, and through channel 8 with a high pressure chamber 9. The control knob 10 with the socket 11 for connecting the main pipeline is activated. To switch the main pressure in the distributor 3, a spring-loaded chamber 12 is installed eccentrically, which is connected by turning the handle to the channels 13 or 14. Channel 14, in turn, is connected to the low pressure chamber 1 5 and neutral position, the channels 13 and 14 are connected to the drain channel 16. The device operates as follows. The working fluid from the hydraulic line is guided through the handle 10 to the gold side 12. At the time of creating the initial thrust, determined by the main pressure, the spool 12 is connected to the channel 13 and the liquid is fed through the check valve 6, the channel 5 and the connecting pipe 4 to the hydrorack . At the same time, through the channel 8, the high-pressure chamber 9 is filled (Platoon cycle). After creating the initial spreading of the hydraulic post, the handle 10 is switched to the Strengthening position. In this case, the spool 12 is installed coaxially with the channel 14 and the working fluid enters the low-pressure chamber 15. Due to the difference in the areas of the piston and the rod, the stem 2 extends from the housing 1; The working fluid in the rod chamber 9 is squeezed with and under increased pressure through the connecting pipe 4 is squeezed into the hydrocavity cavity (Strengthening cycle). Entering an additional portion of the liquid under the hydraulic piston increases its mounting thrust to the working resistance. If necessary, cycle 6 74 Platoon-amplification can be repeated until the safety valve of the hydraulic post acts, after which the handle 10 moves the spool 12 to the neutral position, and the chamber-15 is connected to the drain channel ib. The pressure in all cavities of the device drops and it is freely disconnected from the stand. In combination with two low and high pressure chambers, the hydraulic strut is brought to the working resistance directly at the time of its installation, which increases the implementation of the lining resistance, reduces stratification and reduces its lowering. A three-position flat distributor increases the reliability of the device and reduces the laboriousness of detaching the ° stand, which improves the performance of the cleaning faces. The invention is a device for charging and spreading hydraulic racks, having a body in which body a piston with a rod is placed, forming low and high pressure chambers, a distributor with a spring-loaded spool, a control handle with a connected socket to the channels, for connecting low and high pressure chambers. high pressure and drain channel, characterized in that, in order to increase reliability, ease of use and reduce labor intensity, the connecting socket is made in the control handle, and the distributor Three-position with an eccentric mounted spring-loaded spool, which is connected to the low and high pressure channels by means of a distribution seat with channels, while the high pressure channel is connected to the channel of the distribution seat by means of a check valve. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 352021, cl. B 21 D 15/44, 1971. 2, USSR Copyright Certificate No. 272241, cl. E 21 D 15/58, 1969 (prototype).