Grinding machine tool for reducing hotness of casing

A grinding machine tool for reducing hotness of a casing, comprising:

• the casing, divided into a head and a body, the casing being composed of at least two casing parts, the casing comprising an air inlet formed on the body and an air outlet formed on a side of the head opposite to the body;
• a motor cover, provided in and surrounded by the head of the casing, one end of the motor cover facing a grinding member being open, and the motor cover being cylindrical, wherein a gap is between the motor cover and the at least two casing parts, and the gap comprises a first portion located between a top of the motor cover and the casing, and two second portions respectively located between two sides of the motor cover and an inner wall of the head;
• a drive assembly, arranged in the casing, comprising a circuit board, a motor placed into the motor cover and connected to the circuit board to drive the grinding member to rotate, and an airflow generating member shielding a side of the motor cover facing the grinding member and located between the motor and the grinding member, and the airflow generating member rotating synchronously with the motor;
• and
• an air guiding member, provided in the casing and located in the gap, and the air guiding member comprising a wind receiving end and an air output end higher than the wind receiving end, wherein the air guiding member comprises a main guide surface and two auxiliary guide surfaces, the main guide surface faces the first portion of the gap, and the two auxiliary guide surfaces are respectively disposed at two sides of the main guide surface and face one of the second portions of the gap, and airflow guiding directions of the two auxiliary guide surfaces are different from an airflow guiding direction of the main guide surface;
• wherein when the airflow generating member rotates inside the casing, external air enters from the air inlet and is divided into a first heat dissipation airflow and a second heat dissipation airflow having different flow paths in the casing;
• wherein a flow path of the first heat dissipation airflow begins at the air inlet, passes by the circuit board, flows through the gap between the head of the casing and an upper surface of the motor cover, and exits through the air outlet, thereby dissipating heat from the circuit board and the head of the casing;
• and
• wherein a flow path of the second heat dissipation airflow begins at the air inlet, flows directly into a space between a lower surface of the motor and the airflow generating member, and exits through the air outlet, thereby dissipating heat on a side of the motor facing the airflow generating member.