PL154668B1 - Shield for protection of roof and longwall face areas - Google Patents

Description

REPUBLIC POLAND PATENT DESCRIPTION 154 668 Additional patent to patent no - Int. Cl. ^s E21D 23/03 Reported: 87 04 28 (P. 265432) Precedence --- READING * OFFICE PATENT Application announced: 88 11 10 8 S Ó LH RP Patent description published: 1992 01 31

Creators of the invention: Krystian Lipiński, Jerzy Kozieł, Adam Klima, Józef Kamiński, Antoni M ^ te ^ Jan Dornicze ^ ^Jerz y ^Czaj a, ^Leszek S ^erafin , Karol Mazur, Jerzy Moskal, Bogumił Brzozowski

0 ^law and ^p atentu ^made from: p ^alni ° ^C and for ^{Coal Kam ennego} ° ^{zbar R} k,

Bytom (Poland)

COVER TO PROTECT THE CEILING AND FACE OF THE WALL

The subject of the invention is a cover for a lightweight sliding casing intended for securing the direct ceiling and the face of the wall after each subsequent harvest.

In underground longwall workings, and especially in workings of great height or on a slope, there is a phenomenon of large lumps of coal falling off the face of the wall. These lumps pose a risk to people working in the wall and interfere with the normal course of work because they have to be broken into smaller pieces suitable for transport by conveyors.

In mining practice, several types of covers are known, which, with different forces, obtained by mechanical or hydraulic means, hold the detached lumps preventing them from falling off the face of the wall.

Struts are known from the description of Polish patent No. 75128 and from the German Hemscheidt prospectus, which constitute a hydraulic actuator mounted at one end tiltably to the housing elements, and the other end is articulated with a shield pressed against the wall face. Depending on the strut type, the cover of the front face can be an independent element, connected only to the actuator, or it can be additionally connected at one end to another element of the powered support.

Polish patent description No. 108 583 discloses a face cover, fixed to the end of the canopy and controlled by a hydraulic actuator. There is a rectangular cutout in the lower part of this cover which houses the hydraulic cylinder. On the other hand, the lower part of this cover is made of two booms made of spring plate.

Another structure is the cover of the face of the wall known from the description of Polish patent no

137 943. This cover is attached to the main canopy or to the canopy of the extendable mining support and is supported by a hydraulic cylinder. This cover has two plate elements, the upper of which is placed through the frame, which together with the upper segment

154 668

154 668 is connected to the canopy and is folded back by a hydraulic cylinder. In addition, the frame is connected to the upper segment by means of ties, and the lower segments are connected to each other by a flexible diaphragm fastened with chains.

Although the above-described covers of the front face of the wall fulfill their purpose, they have a number of design flaws and shortcomings, among other things, they are only suitable for covering the face of the wall, while there is often a need to protect the direct ceiling. Therefore, shields of this type have not found a wider, practical application in the mining industry.

The cover for securing the ceiling and the face of the wall, which is the subject of the present invention, does not have the disadvantages and disadvantages described above. The essence of this cover consists in the use of two parts hinged to each other at one end, the front part of the cover is provided with a rotation limiter. On the other hand, the rear part of the cover at the other end has two holders and a bracket permanently attached, which are articulated directly or by means of a hydraulic actuator with brackets permanently attached to the canopy of the basic lightweight sliding housing. Such a structure of the cover provides good support for both the ceiling exposed after each subsequent harvesting and the face of the wall, thus preventing the detachment of coal lumps. An additional advantage of the cover according to the invention is its relatively simple structure, which is easy to manufacture and use, and is reliable in operation.

The subject of the invention is shown in an exemplary embodiment in the drawing, in which Fig. 1 shows the cover in an expanded state in a side view, and Fig. 2 shows the same cover in a folded state also in a side view.

As shown in the drawing, a cover according to the invention for securing a ceiling and a wall face consists of two parts 1, 2 articulated with each other. The front part of this cover is freely suspended with one end at the end of the rear part 2 of the cover. The other end of the rear part 2 of the cover, provided with two holders 3, is articulated to the brackets 4 permanently attached to the end of the main canopy 5 of the lightweight sliding casing. Between the grips 3 of the rear part 2, a bracket 6 is permanently attached, which is articulated with the extension arm of the double-acting hydraulic cylinder 7. The base of this actuator is also articulated with the holders 8 permanently fixed to the lower surface of the main canopy 5 of the housing. Moreover, at the end of the front part 1 of the cover, above the hinge, there is a rotation stop 9, which fixes the vertical position of this part in the extended condition of the cover.

The protection of the ceiling and the face of the wall with the cover according to the invention is carried out as follows. After making another wall, with the help of a divider, the hydraulic cylinder 7 is activated. The ejector of this cylinder, while it extends from the floor, presses on the bracket 6, as a result of which the rear part 2 of the cover rotates around the joint connecting the handles 3 of this part with the brackets 4 of the canopy 5 light sliding housing. This rotation continues until the rear part 2 rests against the head of the excavation, and the front part 1 rests against the face of the wall. The front cover part 1 maintains a constantly vertical position during rotation of the rear cover part 2 and in the extended position or in the folded-in position and can only be swiveled in relation to the rear part 2 towards the face of the wall. On the other hand, its movement towards the goafs, in the extended state of the rear cover 2, is limited by the rotation limiter 9, which prevents detached coal lumps from falling off the face of the wall.

After moving the conveyor, before the next grab, the hydraulic cylinder 7 is restarted, the extension of which, while sliding into the base, causes the shield to rotate around the joint of the supports 4. This movement continues until the shield takes the folded position, shown in Fig. 2, after which the normal cycle of wall cutting it starts all over again.

Claims (1)

Patent claim A cover for securing the roof and the face of the wall after each consecutive harvesting of the mining cycle, cooperating with the canopy of the lightweight sliding support, characterized in that 154 668 consists of two parts (1, 2) hinged to each other at one end, of which the rear part (2) at the other end has two holders (3) permanently fixed, and between these holders a bracket (6), the holders ( 3) are articulated with brackets (4) permanently fixed at the end of the canopy (5) of the light sliding housing, and the bracket (6) is also articulated with the extension of the double-acting hydraulic cylinder (7), connected with the bottom bracket (8) to the bottom surface of the canopy (5), the front part (1) of the cover at the end connected to the rear part (2) having a rotation stop (9). Fig 2 154 668 Department of Publishing of the UP RP. Circulation 100 copies Price: PLN 3,000