The invention relates to an external circulating lubricating and cooling
system for a
coal mining
machine and a
coal mining
machine cutting device. The external circulating lubricating and cooling
system comprises a plate cooler, a
cycloid lubricating pump and an oil suction filter, and the oil suction filter is installed at the inlet end of an oil suction
pipe of the
cycloid lubricating pump and located at the bottom of an oil
pool of the
cutting device; an outlet end of an oil return
pipe of the
cycloid lubricating pump is connected with an oil duct inlet of the plate cooler, an oil duct outlet of the plate cooler is connected with the oil
pool of the
cutting device, and an inlet and an outlet of a
water channel of the plate cooler are correspondingly connected with an outlet and an inlet of a cooling
water jacket of a box body of the cutting device; and the cutting device comprises the lubricating and cooling
system, the plate cooler is fixed to the outer side face of the
coal wall side in the middle of the box body of the cutting device, the cycloid lubricating pump is installed on the box body of the cutting device, and a main shaft of the cycloid lubricating pump is coaxially connected with a third gear shaft set in the box body. The problems that a high-power-density cutting device is high in
operation temperature and a
transmission system is poor in
lubrication can be solved, and the requirements for efficient
lubrication and continuous cooling are met.