Drilling device for coal mining

A drilling device for coal mining, comprising a placement board, wherein the placement board is fixedly connected to a first support pillar and a second support pillar, the first support pillar and the second support pillar are together fixedly connected to a transmission rod, the transmission rod is connected to support rods symmetrically distributed in a limited sliding manner, the support rods symmetrically distributed are connected to a connecting rod in a sliding manner, a first cavity is set inside the connecting rod, the connecting rod is fixedly connected to a first gas pipe interconnected with the first cavity of the connecting rod, the connecting rod is rotationally connected to a drill rod, a second cavity set inside of the drill rod is interconnected with a high-pressure gas pipe, the first support pillar is fixedly connected to a second motor, an output shaft of the second motor is fixedly connected to a first lead screw that is rotationally connected to the first support pillar and the second support pillar, the first lead screw is threadedly connected to a rectangular connecting block fixedly connected to the connecting rod, the rectangular connecting block is fixedly connected to the first motor, an output shaft of the first motor is fixedly connected to the drill rod, the rectangular connecting block is connected to the drill rod in a limited rotating manner, the drill rod is fixedly connected and interconnected with a drill bit, the connecting rod is fixedly connected to arc-shaped blocks evenly distributed in a circumferential direction, the connecting rod is provided with grooves evenly distributed in a circumferential direction, pneumatic telescopic blocks are fixedly connected to the grooves, the pneumatic telescopic blocks are interconnected with the first cavity of the connecting rod, a telescopic end of each pneumatic telescopic block is fixedly connected to an arc-shaped plate, the arc-shaped plate slides between adjacent arc-shaped blocks, and the connecting rod is provided with a blocking mechanism for drilling sealing;

• the blocking mechanism comprises a first seal housing, the first seal housing is slidably connected to the support rods, the first seal housing is fixedly connected to a sealing inner ring, a dust filter screen is arranged between the sealing inner ring and the first seal housing, the sealing inner ring is fixedly connected to a first gas bag, the first gas bag is interconnected with a second gas pipe, the second gas pipe extends through the first seal housing and the sealing inner ring, the first seal housing is connected to a gas pump, the gas pump is slidably connected to the placement board through a connecting block;
• the first seal housing is slidably connected to the second seal housing, the second seal housing is fixedly connected to linear actuators symmetrically distributed, a telescopic end of each linear actuator is fixedly connected to the first seal housing, the second seal housing is fixedly connected to a second gas bag, the second gas bag is connected to a third gas pipe, the second seal housing is provided with a gas detector, the second seal housing is interconnected with an L-shaped dust removal pipe, the L-shaped dust removal pipe is fixedly connected to the placement board, a vertical part of the L-shaped dust removal pipe is provided with spray nozzles distributed in a circumferential direction, the L-shaped dust removal pipe is fixedly connected to a third motor that is fixedly connected to the placement board, a conveyor belt is arranged in the L-shaped dust removal pipe, an output shaft of the third motor is fixedly connected to a drive shaft of the conveyor belt, and the placement board is provided with a cutting mechanism;
• the cutting mechanism comprises a connecting shaft, the connecting shaft is fixedly connected to the placement board, the connecting shaft is rotatably connected to a transmission gear, the placement board is provided with a rectangular groove, the placement board is slidably connected to an L-shaped gear rack, one end of the L-shaped gear rack close to the first support pillar is provided with a rectangular block sliding inside the rectangular groove, a transverse part of the L-shaped gear rack is formed in a wedge shape, the placement board is provided with a limit sliding groove, a limit block is slidably connected inside the limit sliding groove of the placement board, the limit block matches with the transverse part of the L-shaped gear rack, an elastic component is fixedly connected between the placement board and the limit block, a tension spring is arranged between the rectangular block of the L-shaped gear rack and the placement board, the telescopic end of each linear actuator is fixedly connected to an unlocking plate, the unlocking plate matches with the limit block, the connecting shaft is rotatably connected to a gas chamber, the gas chamber is provided with an outer ring and an inner ring, the inner ring is provided with a hole that matches the outer ring, the inner ring of the gas chamber is fixedly connected to the transmission gear, and input ends of the first gas pipe and the second gas pipe are interconnected to the outer ring of the gas chamber.