Assembled diamond bits

The utility model relates to an assembly-type diamond drill which is composed of a drilling shank, a spring, a pin sliding track, a pin, a drilling core and a drum-type cutting head. The utility model is characterized in that the front part of the drilling shank is in a hollow tube shape, and the spring is arranged in the drilling shank; the pin sliding track is arranged on the rear part of the drill shank, which form the one third distance from the end to the neck of the drilling shank at the front part, and the pin sliding track forms a symmetrical opening with 180 DEG in the circumferential direction; the drilling core is arranged into the center of the drum-type cutting head and is fixedly connected with the center of the drum-type cutting head by the pin, and the pin which penetrates through a pin hole on the drill core by the sliding track of one side to enter the sliding track of the opposite direction. Therefore, the pin can flollow with the expansion and contraction of the spring to freely slide in the pin sliding track up and down. The utility model has the advantages of novel and cabinet structure, flexible work, convenient use and practical effect; in addition, the utility model overcomes the defects of the prior art; thus, the utility model provides a small-sized hand-hold electric drilling tool with convenient use and labour saving for architectural decoration and construction. When the utility model is used, the construction quality and the construction speed of the architectural decoration and construction are raised, the waste phenomenon is avoided, and the operating cost and the construction cost are lowered.