A shearing system includes a pan line having an end stop, a gate end, and a set of consecutively arranged pans extending from the gate end and having one or more pans disposed beyond the end stop. A shearer is stoppable at the end stop, includes a shearer arm, and is positioned on the one or more pans when the shearer arm is disposed between the end stop and the gate end. A first sensor detects an orientation of the shearer, while second sensors detect an orientation of the set of consecutively arranged pans. A control system determines a profile of the pan line between the end stop and the gate end and controls a movement of the shearer arm based on the profile of the pan line when the shearer arm is disposed between the end stop and the gate end.

A shearing system includes a pan line having an end stop, a gate end, and a set of consecutively arranged pans extending from the gate end and having one or more pans disposed beyond the end stop. A shearer is stoppable at the end stop, includes a shearer arm, and is positioned on the one or more pans when the shearer arm is disposed between the end stop and the gate end. A first sensor detects an orientation of the shearer, while second sensors detect an orientation of the set of consecutively arranged pans. A control system determines a profile of the pan line between the end stop and the gate end and controls a movement of the shearer arm based on the profile of the pan line when the shearer arm is disposed between the end stop and the gate end.

A cable handling system for a longwall mining machine is disclosed. The longwall mining machine includes a shearer configured to move along a pan line to mine material along a mine face. The cable handling system includes a service line configured to carry one or more supply lines to the shearer for facilitating shearer operation. Further, a plurality of interconnected trays accommodates the service line. Moreover, a controller is configured to determine a profile of the pan line; detect one or more parameters associated with the service line in relation to the profile of the pan line; and determine a likelihood of at least a portion of the service line dislodging from the plurality of interconnected trays based on the one or more parameters exceeding a predefined threshold.

Disclosed is a comprehensive vertical-lifting drum shearer without a rocker arm suitable for mining a medium-thick long wall coal seam having a coal seam dip angle of less than 30 degrees and a medium-hard or hard coal quality. The comprehensive vertical-lifting no-rocker drum shearer comprises a central control box (1), left and right cutting lifting reduction boxes (9, 8), left and in right side guiding rail fixing casings (4, 5), left and right traction reduction boxes (18, 15), and left and right walking gearboxes (17, 16); the left and right cutting lifting reduction boxes (9, 8) are provided with slideways which are matched with lifting guiding rails (10) of the left and right side guiding rail fixing casings (4, 5) in a sliding manner; the left and right cutting lifting reduction boxes (9, 8) are driven to perform a lifting motion by lifting oil cylinders (19), and meanwhile, cutting motors of the left and right cutting lifting reduction boxes (9, 8) drive a spiral drum to rotate by means of a cutting gear reduction mechanism; the left and right traction reduction boxes (18, 15) drive the left and right walking gearboxes (17, 16), and then drive the whole machine to perform left and right traction movement. The cutting gear reduction mechanism of said shearer uses two-level gear transmission and two-level planetary gear transmission, without a plurality of idle wheel sets, and the transmission chain is simple; and the cooperation of the lifting guiding rails and the slideways makes the whole machine compact in structure, improving the operation reliability and stability.

Disclosed is a comprehensive vertical-lifting drum shearer without a rocker arm suitable for mining a medium-thick long wall coal seam having a coal seam dip angle of less than 30 degrees and a medium-hard or hard coal quality. The comprehensive vertical-lifting no-rocker drum shearer comprises a central control box (1), left and right cutting lifting reduction boxes (9, 8), left and in right side guiding rail fixing casings (4, 5), left and right traction reduction boxes (18, 15), and left and right walking gearboxes (17, 16); the left and right cutting lifting reduction boxes (9, 8) are provided with slideways which are matched with lifting guiding rails (10) of the left and right side guiding rail fixing casings (4, 5) in a sliding manner; the left and right cutting lifting reduction boxes (9, 8) are driven to perform a lifting motion by lifting oil cylinders (19), and meanwhile, cutting motors of the left and right cutting lifting reduction boxes (9, 8) drive a spiral drum to rotate by means of a cutting gear reduction mechanism; the left and right traction reduction boxes (18, 15) drive the left and right walking gearboxes (17, 16), and then drive the whole machine to perform left and right traction movement. The cutting gear reduction mechanism of said shearer uses two-level gear transmission and two-level planetary gear transmission, without a plurality of idle wheel sets, and the transmission chain is simple; and the cooperation of the lifting guiding rails and the slideways makes the whole machine compact in structure, improving the operation reliability and stability.

The present disclosure relates to a plow guide assembly for guiding a mining plow. The plow guide assembly may comprise a base member including a first guide beam for guideing the mining plow and extending along a first axis, and a second guide beam spaced apart the first guide beam for defining a service clearance therebetween, and extending along a second axis axially aligned to the first axis. The plow guide assembly may further comprise an insert element insertable into the service clearance and having a third guide beam extending along a third axis. In an assembled state of the insert element, the third axis is axially aligned to the first and second axes.

The present disclosure relates to a plow guide assembly for guiding a mining plow. The plow guide assembly may comprise a base member including a first guide beam for guideing the mining plow and extending along a first axis, and a second guide beam spaced apart the first guide beam for defining a service clearance therebetween, and extending along a second axis axially aligned to the first axis. The plow guide assembly may further comprise an insert element insertable into the service clearance and having a third guide beam extending along a third axis. In an assembled state of the insert element, the third axis is axially aligned to the first and second axes.

Systems and methods are described for monitoring a condition of a mine roof using a longwall mining system. A plurality of powered roof supports is controlled to apply an adjustable support pressure on a mine roof. A condition of the mine roof is monitored based on the adjustable support pressure applied to the roof by a respective actuator of each powered roof support. In some implementations, the condition of the mine roof is monitored by generating and analyzing a graphical pressure map based on the adjustable support pressure applied by each powered roof support and a relative position of a shearer moving across the mine face. In some implementations, roof collapse events are detected based on temporally similar changes in the adjustable support pressure applied by multiple adjacent powered roof supports as indicated by the graphical pressure map.

Systems and methods are described for monitoring a condition of a mine roof using a longwall mining system. A plurality of powered roof supports is controlled to apply an adjustable support pressure on a mine roof. A condition of the mine roof is monitored based on the adjustable support pressure applied to the roof by a respective actuator of each powered roof support. In some implementations, the condition of the mine roof is monitored by generating and analyzing a graphical pressure map based on the adjustable support pressure applied by each powered roof support and a relative position of a shearer moving across the mine face. In some implementations, roof collapse events are detected based on temporally similar changes in the adjustable support pressure applied by multiple adjacent powered roof supports as indicated by the graphical pressure map.

A guide shoe for a mining machine includes a shoe body, a through hole, and a support. The shoe body is configured to engage a rack. The through hole extends between a first wall of the shoe body and a second wall of the shoe body, and the through hole extends along a central axis. The support is coupled to the first wall, and the support is configured to engage a shaft coupled to a drive sprocket engaging the rack. At least one of the shaft and the support is movable between a first configuration and a second configuration. The rotation axis is spaced apart from the rack by a first sprocket distance in the first configuration, and the rotation axis is spaced apart from the rack by a second sprocket distance in the second configuration.