A vertical lifting type drum coal-mining machine without a rocker arm includes a central control box, left and right cutting and lifting reduction gear boxes, left and right guide rail fixing box bodies, left and right traction reduction gear boxes, and left and right traveling gear boxes. The left and right cutting and lifting reduction gear boxes are provided with slideways in fit with lifting guide rails of the left and right guide rail fixing box bodies. Lifting cylinders drive the left and right cutting and lifting reduction gear boxes to make lifting motion. A cutting gear reduction mechanism adopts two-stage fixed-axle gear transmission and two-stage planetary gear transmission, is free from multiple idler pulley groups and has simple transmission chain. The fit between the lifting guide rails and the slideways enables the entire machine to be compact in structure, and the reliability and stability of operation are improved.

A cutting assembly for a rock excavation machine having a frame includes a boom and a cutting device supported on the boom. The boom includes a first portion and a second portion, the first portion supported for pivotable movement relative to the frame. In some embodiments, the first portion includes a first structure extending along a longitudinal base axis and a second structure moveable relative to the first portion in a direction parallel to the longitudinal base axis, and at least one bearing supports the second portion for movement relative to the first portion. In some embodiments, the second portion is pivotably coupled to the first portion by a universal joint, and a suspension system including a plurality of biasing members may be coupled between the first portion and the second portion.

A cutting assembly for a rock excavation machine having a frame includes a boom and a cutting device supported on the boom. The boom includes a first portion and a second portion, the first portion supported for pivotable movement relative to the frame. In some embodiments, the first portion includes a first structure extending along a longitudinal base axis and a second structure moveable relative to the first portion in a direction parallel to the longitudinal base axis, and at least one bearing supports the second portion for movement relative to the first portion. In some embodiments, the second portion is pivotably coupled to the first portion by a universal joint, and a suspension system including a plurality of biasing members may be coupled between the first portion and the second portion.

Disclosed is a multi-section non-pillar staggered protected roadway for a deep inclined thick coal seam (DITCS) and a method for coal pillar filling between sections. The multi-section non-pillar staggered protected roadway includes a floor, a coal seam, an immediate roof, and a basic roof in a multi-section coal seam, where the floor is disposed below the coal seam, a hydraulic support is disposed in a section between the floor and the immediate roof; a return airway and a transportation roadway are respectively disposed on a left side and a right side of each section; the return airway and the transportation roadway in each section are communicated with each other through a working face; and non-pillar staggered layout is used for a return airway of a next section and a transportation roadway of a current section.

Disclosed is a multi-section non-pillar staggered protected roadway for a deep inclined thick coal seam (DITCS) and a method for coal pillar filling between sections. The multi-section non-pillar staggered protected roadway includes a floor, a coal seam, an immediate roof, and a basic roof in a multi-section coal seam, where the floor is disposed below the coal seam, a hydraulic support is disposed in a section between the floor and the immediate roof; a return airway and a transportation roadway are respectively disposed on a left side and a right side of each section; the return airway and the transportation roadway in each section are communicated with each other through a working face; and non-pillar staggered layout is used for a return airway of a next section and a transportation roadway of a current section.

A cutting device for engaging a rock face includes a disc body supported for rotation about an axis of rotation, and a plurality of peripheral portions removably secured to the disc body. Each of the peripheral portions including a plurality of cutting bits positioned on a peripheral edge. The peripheral edge of each peripheral portion is aligned with the peripheral edges of adjacent peripheral portions.

A cutting device for engaging a rock face includes a disc body supported for rotation about an axis of rotation, and a plurality of peripheral portions removably secured to the disc body. Each of the peripheral portions including a plurality of cutting bits positioned on a peripheral edge. The peripheral edge of each peripheral portion is aligned with the peripheral edges of adjacent peripheral portions.

An apparatus, system, and method for automated support of a gate entry for underground full extraction mining that includes gathering entry data for a condition of a gate entry by way of a gate entry support. The method also includes determining, by way of the gate entry support, the condition of the gate entry, advancing the gate entry support in response to determining that the condition satisfies an entry condition threshold. The method may also signal a halt condition for a production cycle, if the condition fails to satisfy the entry condition threshold.

An apparatus, system, and method for automated support of a gate entry for underground full extraction mining that includes gathering entry data for a condition of a gate entry by way of a gate entry support. The method also includes determining, by way of the gate entry support, the condition of the gate entry, advancing the gate entry support in response to determining that the condition satisfies an entry condition threshold. The method may also signal a halt condition for a production cycle, if the condition fails to satisfy the entry condition threshold.

A cutting device for engaging a rock face includes a disc body supported for rotation about an axis of rotation, and a plurality of peripheral portions removably secured to the disc body. Each of the peripheral portions including a plurality of cutting bits positioned on a peripheral edge. The peripheral edge of each peripheral portion is aligned with the peripheral edges of adjacent peripheral portions.