A flexible material handling apparatus is arranged to be installed on a full face heading machine. The apparatus includes a material handling member and a linkage member coupled together in a head-tail manner by a joint connection, and the linkage member at the other end may be coupled to a frame of a heading machine. The entire apparatus may be retracted to rest on the side of the machine frame and maintained there by a locking means. The material handling member may be swivelled about two separate vertical axes and brought outwardly to an oblique front position, where one or more locking means may be included to secure the material handling member fixed in place relative to the machine frame.

A flexible material handling apparatus is arranged to be installed on a full face heading machine. The apparatus includes a material handling member and a linkage member coupled together in a head-tail manner by a joint connection, and the linkage member at the other end may be coupled to a frame of a heading machine. The entire apparatus may be retracted to rest on the side of the machine frame and maintained there by a locking means. The material handling member may be swivelled about two separate vertical axes and brought outwardly to an oblique front position, where one or more locking means may be included to secure the material handling member fixed in place relative to the machine frame.

An earth working machine (10), for example a road milling machine (10), recycler, stabilizer, or surface miner, having a propelling unit (22) and a machine frame (12) carried by the propelling unit (22), comprises a working apparatus (32) for earth working; an operator's platform (24), having an operating console (26) for controlling at least one functional device (32, 39) of the earth working machine (10), being provided on the machine frame (12). Provision is made according to the present invention that the earth working machine (10) comprises, in the region of the operator's platform (24), a seat mount arrangement (66) that is embodied to be brought into releasable mounting engagement with a counterpart mount arrangement (76) of an operating seat (62, 64).

A shearer cutting unit with double-speed rollers includes a motor driving unit, a motor driving unit, a gear transmission unit and a roller output unit. The motor driving unit includes a left cutting motor and a right cutting motor which are both arranged in a cutting unit case and connected with the roller output unit in a transmission way through the gear transmission unit. The roller output unit comprises a middle output shaft (3-1), a far-end output shaft, a middle support frame, a middle roller, a far-end support frame and a far-end roller. A cutting roller is separated into two coaxially-rotating parts, and the two rollers can rotate in different speeds.

Methods and systems of controlling a pitch angle of a shearer. A controller receives a sensor signal indicative of the pitch angle of the shearer, and receives a target pitch profile defining a plurality of target pitch angles for different sections of a mineral face. The controller determines a pitch difference between the pitch angle and a target pitch angle of the shearer, determines a pitch correction height corresponding to a new height for a floor cutter of the shearer based on the pitch difference, and changes a height of the floor cutter based on the pitch correction height.

Methods and systems of controlling a pitch angle of a shearer. A controller receives a sensor signal indicative of the pitch angle of the shearer, and receives a target pitch profile defining a plurality of target pitch angles for different sections of a mineral face. The controller determines a pitch difference between the pitch angle and a target pitch angle of the shearer, determines a pitch correction height corresponding to a new height for a floor cutter of the shearer based on the pitch difference, and changes a height of the floor cutter based on the pitch correction height.

A tool for positioning a block on a milling drum having a plurality of welded blocks thereon is provided. The tool includes a longitudinal body. The tool also includes a plurality of arm members extending from the longitudinal body. Each of the plurality of arm members includes a fixture body provided at a distal end thereof. The tool further includes a plurality of fixture assemblies coupled to the fixture body of the corresponding arm member. The plurality of fixture assemblies are adapted to be coupled with corresponding welded blocks of the plurality of welded blocks. Further, at least one of the plurality of arm members and the corresponding fixture assembly coupled to the at least one of the plurality of arm members are adapted to position the block at a desired position on the milling drum relative to the plurality of welded blocks.

A tool for positioning a block on a milling drum having a plurality of welded blocks thereon is provided. The tool includes a longitudinal body. The tool also includes a plurality of arm members extending from the longitudinal body. Each of the plurality of arm members includes a fixture body provided at a distal end thereof. The tool further includes a plurality of fixture assemblies coupled to the fixture body of the corresponding arm member. The plurality of fixture assemblies are adapted to be coupled with corresponding welded blocks of the plurality of welded blocks. Further, at least one of the plurality of arm members and the corresponding fixture assembly coupled to the at least one of the plurality of arm members are adapted to position the block at a desired position on the milling drum relative to the plurality of welded blocks.

A self-propelled construction machine comprises a machine frame, at least three travelling devices, at least one hydraulic drive system for driving at least two travelling devices, wherein the hydraulic drive system comprises at least one controllable hydraulic motor with variable displacement volume and at least one hydraulic pump, at least one working device (e.g. a milling drum), for working the ground pavement. A detection device detects fluctuations in the longitudinal speed of the construction machine during movement thereof, wherein a control unit alters the displacement volume of the at least one controllable hydraulic motor as a function of the detected fluctuations so that the natural frequency of the hydraulic drive system is altered, wherein the control unit adjusts the discharge volume of the pump as a function of the amount of adjustment of the displacement volume in such a fashion that the specified drive speed remains constant.

A self-propelled construction machine comprises a machine frame, at least three travelling devices, at least one hydraulic drive system for driving at least two travelling devices, wherein the hydraulic drive system comprises at least one controllable hydraulic motor with variable displacement volume and at least one hydraulic pump, at least one working device (e.g. a milling drum), for working the ground pavement. A detection device detects fluctuations in the longitudinal speed of the construction machine during movement thereof, wherein a control unit alters the displacement volume of the at least one controllable hydraulic motor as a function of the detected fluctuations so that the natural frequency of the hydraulic drive system is altered, wherein the control unit adjusts the discharge volume of the pump as a function of the amount of adjustment of the displacement volume in such a fashion that the specified drive speed remains constant.