RU1800049C - Safeguard for hydraulic prop of mine support - Google Patents

Abstract

Usage: in the mining industry for fastening with mechanized roof supports working under conditions of dynamic roof subsidence and in the presence of 2--: impact loads from it. SUMMARY OF THE INVENTION: A safety device for a hydraulic strut of a shaft support includes a housing with drain holes. A hollow spool with a spring and a spherical stop is located in the housing, the front end of the spool has longitudinal holes, and its tail part has radial holes for connecting the balanced cavity to the cavity of the hydraulic stand. The diameter of each radial hole is equal to the stroke of the spool. In the housing there is a balanced cavity and a control valve connected to it with a removable cup. On the case between the drain hole and the inertial load, a damper is rigidly mounted, made in the form of a -shaped washer. The center of mass of the inertial load is located on the longitudinal axis of the control valve of the guide pin. 2 ill. SL C

Description

FIELD: mining. SUBSTANCE: invention relates to mining, in particular to mechanized supports working under conditions of dynamic roof subsidence and in the presence of shock loads from it.

The aim of the invention is to increase the safety, reliability and speed of operation of a safety device.

In Fig.1 shows a hydrostand and safety device in the context; figure 2 is a view of figure 1.

According to the invention, the hydraulic strut 1 of the shaft support includes a hydraulic cylinder, a rod with a piston installed therein, forming piston cavities. The safety device is connected to the upper movable part of the hydraulic stand 1 and has a housing 2 and a cover 3. A cylindrical hollow spool 4 is placed in the housing, in which a working spring 5 is placed, with one end it is screwed into screw 6 and the other into a spherical stop 7 located in constant point contact with the front perforated wall of the spool 4, through which the drain hole 8 of the hydraulic stand 1 is blocked. The spool 4 is made hydraulically balanced - fluid bypass from the piston cavity of the hydraulic stand 1 in balance ayuschuyu cavity 9 takes place due to a loose fit with a gap between the housing 2 and the cover 3 slide valve 4 at its rear portion formed with radial: holes 10 whose diameter is equal to the move of the spool, connectable hydraulically counterbalancing valve cavity 9

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eighteen

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the internal cavity of the spool 4, i.e. hydrostatic cavity 1.

The balancing cavity 9 is closed by a control valve, the rod 11 of which covers the drain hole 12 under the action of the adjustment spring 13. The force of the pressure of the adjustment spring 13 is changed by the stopper 14 located in the control valve cup 15. The block body 2 has a number of radial drain holes 16 overlapped by the spool 4. The body 2 has a washer 17 located on it and a cylindrical inertial load 18 with a guide pin 19, and the second guide is the control body 15 valve. The inertial load 18 is connected to the stem 11 by a nut 20 ..

With the shock load applied to the hydraulic stand 1, it and the housing 2 of the protection unit connected to it sharply shift downward, and the inertia force of the load 18 through the nut 20 and the rod 11 and the pressure force in the cavity 9 compress the tuning spring 13, as a result of which the control valve opens, providing draining the fluid from the cavity 9 through the drain hole 12. After this, the balance of the forces acting on the spool 4 is violated, which is shifted by the pressure of the liquid in the hydraulic rack 1 towards the cover 3, compressing the working spring 5. Radial holes 10 in the valve spool 4 soy the cavity 9 with the cavity of the hydraulic stand 1 is rotated, which provides pressure equalization in the cavity of the hydraulic stand and the balancing cavity 9, at the same time, the liquid is drained from the hydraulic stand 1 through the drain holes 16. The direction of the liquid discharge from the hydraulic stand 1 through the holes 16 is changed by a washer 17 moreover, the energy of liquid ejection is quenched on the housing of the hydraulic stand 1. After unloading the hydraulic stand 1, the load 18 is guided by a guide pin 19, the control valve cup 15 and the cavity of the washer 17, and returns to its original position, and troechna spring 13 the rod 11 closes the opening 12. The compressing a spring 5, interacting through a spherical abutment 7, the spool 4 returns to its original position and the device goes into idle dynamic load. During subsequent dynamic loading of the hydrostand, the process of ejection of liquid from it is repeated. The use of the invention improves the reliability and safety of operation of the device under dynamic loads.

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Claims (1)

The claims A safety device for a hydraulic shaft support of a mine support, including a housing with drain holes and a balanced random spool located in it with longitudinal holes in the front end installed to shut off the drain hole under the action of a spring located in the spool, a control valve connected to balanced cavity of the spool and located with the possibility of interaction with the inertial load, covering the housing of the safety device and having a guide pin mounted in the housing and the inertia of the load in alignment with the control valve, which, in order to increase, reliability, speed and safety in using the device, it equipped with a damper made in the form of a -shaped washer, rigidly mounted on the housing between the drain hole and the inertial load, the cavity of which is turned to the side opposite from the inertial load with the possibility of moving the latter on the outer surface of the washer, while the spool spring is provided with a spherical stop mounted with the possibility of contact with the front end of the spool, which in the rear part is made with radial holes for connecting the balancing cavity of the spool with the cavity of the hydraulic stand, the diameter of each of which is equal to the stroke of the spool, and the control valve is equipped with a removable nozzle for guiding the inertial load, the center of mass of which is located on the longitudinal axis of the control valve and guide the pin. FIG. 2