Abstract: A bolter miner includes a rack, a cutting device and a bolt support device. The cutting device is configured for a cutting operation and is arranged on the rack to swing up and down. The bolt support device includes a lifting assembly, a work platform, a first drilling frame assembly and a stabilization assembly. The lifting assembly is arranged between the rack and the work platform and is configured to lift the work platform. The first drilling frame assembly and the stabilization assembly are arranged on the work platform. The first drilling frame assembly has a bolt support position and an avoidance position. The work platform can extend and retract to switch the bolt support position and the avoidance position of the first drilling frame assembly. The stabilization assembly can be supported between the cutting device and a tunnel roof, so as to enhance the stability of the first drilling frame assembly during a bolt support operation.

Abstract: A pulse generator used for a one-step starting carburetor includes a pulse chamber, a lower cover, a support and a solenoid valve. Two types of pulse are produced in the pulse chamber: the normal pulse and the crowding pulse. The normal pulse provides the normal pulse force for the carburetor. When the engine starts in cold, the crowding pulse goes into the carburetor to concentrate the gas mixture in a mixing chamber of the carburetor. The pulse generator described herein solves the problem that the pulse force is insufficient in the four-stroke engine. The original suction pulse is modified to two directions of a suction pulse and a blowing pulse. The fuel pumping capacity of the oil pumping unit which is connected with the carburetor is greatly increased to improve working stability of the engine.