Abstract: An air guider disposed in a grinding machine tool. The grinding machine tool comprises a casing and a motor disposed in the casing. The casing comprises a head for disposing the motor and a body formed with at least one air inlet. The air guider comprises a main body, and an ascending diversion portion integrally formed with the main body, the main body is disposed at a junction between the head and the body, the ascending diversion portion comprises a main guide surface to guide a first heat dissipation airflow entering from the air inlet to flow toward a top of the motor, and two auxiliary guide surfaces respectively disposed on two sides of the main guide surface to generate a second heat dissipation airflow.

Abstract: A grinding machine tool for reducing hotness of a casing, includes a casing and a drive assembly. The casing is divided into a head and a body; includes casing parts; includes an air inlet provided on the body and an air outlet provided on a side of the head; and forms a motor cover on the head, and the motor cover does not contact the casing parts to form an airflow passage in the casing. The drive assembly includes a circuit board, a motor placed into the motor cover, and an airflow generating member rotating synchronously with the motor. When the airflow generating member rotates, it generates a first heat dissipation airflow passing through the airflow passage and dissipating heat of the circuit board and the head, and a second heat dissipation airflow dissipating heat on a side of the motor facing the airflow generating member.