Spindle locking structure for drilling machine

The utility model relates to the field of drilling machines, and discloses a main shaft locking structure for a drilling machine, which comprises a connecting component, a fluted disc, a linear driving mechanism and a tooth-shaped bolt. The tooth-shaped plug pin is driven by the arranged linear driving mechanism to conduct linear displacement, teeth on the tooth-shaped plug pin are connected with the fluted disc in a meshed mode, and the fluted disc can be limited; compared with the mode of locking by means of friction force in the prior art, the mode of locking by means of meshing connection is more stable, and the situation of locking failure caused by factors such as gravel and greasy dirt in the environment, reverse torque sudden change of the mud motor and the like is avoided. 本实用新型涉及钻机领域，公开了一种钻机用主轴锁固结构，包括连接组件、齿盘、线性驱动机构以及齿形插销。通过设置的线性驱动机构带动齿形插销进行直线位移，并使齿形插销上的齿牙与齿盘进行啮合连接，能够对齿盘起到限位的作用；与现有技术中依靠摩擦力进行锁固的方式相比，本实用新型采用啮合连接对其进行锁固的方式会更加稳定，其不会由于环境中的砂砾、油污的影响以及泥浆马达的反向扭矩突变等因素而出现锁固失效的情况。