Kabushiki Kaisha Mitsui Miike Seisakusho

Mitsui Sekitan Kogyo Kabushiki Kaisha

Zaidan Hojin Sekitan Gijutsu Kenkyusho

Mitsui Miike Machinery Co., Ltd.

Ryuji Yamada

Hiroshi Kuroda

Koji Sato

Mamoru Serino

Shoji Igata

Keishi Ito

A double ended ranging drum shearer is provided with a shearer body and a pair of drums disposed at front and rear end portions of the shearer body to be movable up- and down-wardly. The shearer is further equipped with detectors for respectively detecting the travelling position of the shearer body, detecting the inclination of the shearer body at the travelled position, and detecting the heights of drums at the travelled position. These detectors are operatively connected to a controlling device which is connected to a drum height adjusting device. The controlling device operates and stores the drum heights necessary for keeping constant the working height of a mining face in a pit in accordance with output signals generated from the abovementioned detectors, and the drum height adjusting device is operated in response to an output transmitted from the controlling device representing the thus operated and stored data.

Double ended ranging drum shearer and method of controlling working

According to the applicant's invention a load detector is used, in which a load sensor and a vibration sensor are combined using an AND gate. A load signal from the load detector is used for the feedback control of the cutter drum height and double ranging drum cutter running speed, so that a person who is not skilled can operate the double ranging drum cutter while preventing overload acting on the cutter drum.

Double ranging drum cutter having load controller

A double ranging drum cutter for long wall type machines for coal extraction is disclosed, which comprises a drum cutter body, a television camera mounted on the drum cutter body for picking up an image of a coal layer cutting portion of a lower bedrock being cut by a cutter drum, a television camera mounted on the drum cutter body for picking up an image of a coal layer cutting portion of an upper bedrock being cut by a cutter drum, and a video image processing unit mounted on the drum cutter body and connected to the television cameras, whereby the boundary between a coal layer and bedrock can be readily judged to permit extraction of much coal without cutting much bedrock and also the ratio of the area of a bedrock to the area of a coal layer in a portion of the bedrock being cut can be readily detected.

Double ranging drum cutter having bedrock sensor based on video image

An arrangement is described for controlling a winch used in mining machinery, wherein the direction of operating a winch and speed thereof are controlled by changing the position of a control element of a fluid pump for supplying a fluid into a fluid pressure recirculating circuit, by a device incorporating the fluid pressure recirculating circuit and a control circuit. The arrangement is characterized by feeding ON/OFF signals for giving instructions of a position to a control element, by a bi-polar pulse generator. Pulse from the bi-polar pulse generator are fed to a reversible BCD counter by pressing push buttons, and comparing a voltage generated via a D/A converting circuit from the reversible BCD counter with a voltage generated from a potentiometer coupled to the control element according to the position of the control element to be selected, thereby controlling the instruction of the position of the control element; and setting a speed of the winch by pressing the push buttons.

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Omuta, Japan

Ryuji Yamada