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库兹涅茨克煤炭科学研究所的发明者提出了用卷材背顶的新装置。 该装置由缠有卷材的滚筒1以及固定在滚筒上的渐开线齿轮2组成。滚筒安在其端部带有叉头4的轴3上,叉头通过销轴5与可调耳座6活动连接。耳座固定在采煤机7上,并通过弹簧8的作用使滚筒始终压紧顶板,而弹簧9使滚筒处于平行于顶板的位置上。在弹簧12的作用下,滚轮10与卷材相接触,而滚轮10则通过杠杆13及滚轮14与渐开线齿轮相互连系。卷材在液压支架顶梁15的作用下压紧顶板。采煤机运行时,卷材从在弹簧8和9作用下始终压紧顶板的滚筒上松卷。这时,通过弹簧12的作用,滚轮14与渐开线齿轮脱离啮合,不影响渐开线齿轮和滚筒转动。卷材则沿顶板并顺着工作面拉开,然后通过液压支架顶梁加以支撑。
The inventor of the Kuznetsko Institute of Coal Science proposed a new device with a rolled-back roof. The device is composed of a drum 1 wrapped with a coil and an involute gear 2 fixed on the drum. The drum is mounted on a shaft 3 with a fork 4 at its end, which is movably connected to the adjustable ear 6 via a pin 5. The ears are fixed on the coal shearer 7 and the rollers are always pressed against the roof by the action of a spring 8 which places the drum in a position parallel to the roof. Under the action of the spring 12, the roller 10 is in contact with the web, and the roller 10 is interconnected with the involute gear via the lever 13 and the roller 14. The web clamps the roof under the action of the hydraulic support roof beam 15. When the shearer is running, the web is unwound from the rollers that are always pressed against the top plate under the action of springs 8 and 9. At this time, the roller 14 is disengaged from the involute gear by the action of the spring 12, without affecting the involute gear and the drum to rotate. The web is pulled along the roof and down the work surface, and then supported by the top beam of the hydraulic support.