SU1469164A1 - Hydraulic prop for power support - Google Patents

Abstract

The invention relates to underground mining of coal, in particular to mechanized rooftops with hard-to-get roofs that are dangerous to rock bumps. The goal is to increase the efficiency of the rack by increasing its extension. The hydraulic strut (GS) consists of a cylinder 1, a rod 2 with an internal cavity. The piston 3 is made of two parts 4, 5. Part 4 of the piston 3. is rigidly connected to the rod 2, and the other part 5 is mounted movably. Dempo b

Description

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The footer device is made in the form of a movable upper cylinder (C) 7 and lower C 8, which is used to locate the compensation element in the form of a gas chamber. Safety and back-unloading valves 10, 11 are installed on the HS, the Upper C 7 and the lower C 8 are installed in the internal cavity of the rod. The lower C 8 and the movable part 5 of the piston 3 are rigidly connected to each other and are placed above the piston cavity of the HS. When applying liquid

The invention relates to underground coal mining, in particular, to mechanized pit faces with hard-to-reach roofs, hazardous to rock bumps.

The purpose of the invention is to increase the efficiency of the rack by increasing its expansion.

, Fig. 1 schematically shows a hydraulically mounted hydraulic strut (up to thrust); figure 2 - the same, at the time of expansion of the hydraulic rack; figure 3 the work of the elements of the hydraulic rack at the time of the rock blow; 4 is the same in the active backwater mode (when removing the thrust in the hydraulic strut).

The hydraulic column consists of cylinder 1, rod 2, piston 3, made of two parts 4 and 5. Part 4 of piston 3 is rigidly connected to rod 2, a. Part 5 of the piston -3 is movable relative to the inner surface 6 of the rod 2. The hydraulic strut is provided with a damping device in the form of two cylinders: the upper 7 and the lower 8.

The lower cylinder 8 is rigidly connected to part 5 of the piston 3 and forms a single movable element with the latter, and the upper cylinder 7 is oriented movably relative to the inner surface 6 of the rod. 2 with the formation of a remote stage of the rod 2. Between the cylinders 7 and 8 there is a compensation element in the form of a gas chamber 9.

By channel 12, the pressure of which is greater than the gas pressure in chamber 9, the rod 2 moves out together with part 5 of the piston 3. During a rock blow, the rod 2 together with C 7 moves downwards. The peg working fluid moves C 8 and part 5 of the piston 3 upwards and a part of it is discharged through the safety valve 10. The presence of gas pressure in the GS rod ensures that C 7 does not affect the roof of the 21, 4 sludge.

The hydraulic strut is also equipped with a hydraulic lock with safety 10 and back-unloading .t valves, inlet 12 and outlet 13 channels. In the upper cylinder 7 of the damper device, a channel 14 is made for gas filling of the chamber 9, and a plug 15 of the channel 14 is also installed. In addition, an outer

5 of the surface 16 of the upper cylinder .7, a groove 17 is filled, which is filled with a viscous liquid, which serves to provide additional sealing of the cylinder 7 with respect to

0 internal surface 6 of the rod 2, as well as for the lubrication of a. Collection of abrasive particles. In turn, part 4 of the piston 3 in the cylinder T forms a piston cavity 18 and a rod cavity 19.

Hydraulic rack works

in the following way.

In the initial position (Fig. 1), the gas chamber 9 is filled with compressed, 0 gas under pressure: PO. In this case, part 5 of the version 3, together with the lower cylinder 8, is in the bottom dead center, and the upper cylinder 7 is in the upper dead point along the length 5 of the rod 2. The rod 2 itself is also in the lower dead point of the cylinder t.

When the working fluid is supplied: (FIG. 2) ON the supply channel 12 we-the hydraulic lock into the piston cavity 18 under the pressure P, PO, the rod 2 moves together with the .5 part of the piston 3. Lastly, overcoming the resistance PO Before reaching the pressure points ///

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Editor Yu, Sereda

Compiled by E.Panchuk

Tehred M.Didyk - Corrector M.Demchik

Order 1335/37

Circulation 449

VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5

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Claims (1)

Claim Hydraulic stand for mechanized support, including a cylinder, a rod made with an internal cavity, a piston made of two parts, one of which is rigidly connected to the rod, and the other is mounted movably, a damper device in the form of a movable upper and lower cylinders, between which there is a compensation an element in the form of a gas chamber, valves in communication with the piston and rod cavities, characterized in that, in order to increase the efficiency of the rack by increasing its extension, the upper and lower ilindry buffer device installed in the internal cavity of the stem, the lower portion of the cylinder and the movable piston is rigidly linked and placed over the piston cavity · rack.