Seal type laboratory sample preparation crusher

The utility model relates to a crusher, and particularly relates to a seal type laboratory sample preparation crusher used in coal mine testing. The utility model adopts the technical scheme that the seal type laboratory sample preparation crusher comprises a handle hold-down device, and a motor is connected with a flail block through arranging belt pulleys for driving belts on rotating shafts; the handle hold-down device comprises a handle, a connecting body and pressing blocks, the connecting body is movably connected with and arranged on a working platform in a hinged manner, the handle is fixed at the moving end of the connecting body, a pair of pressing blocks connected through a spindle is arranged below the connecting body, and the pressing blocks are used for fixing the cover plate of a grinding device in a propping and fixing manner. The seal type laboratory sample preparation crusher provided by the utility model has the advantages as follows: the structure is simple, requirements of manufacturing and mounting accuracy are not high, and the maintenance is convenient. In the structure, torque is transferred through the belts between the belt pulleys, the transmission is stable, the noise is low, buffering and vibration absorbing effects can be played, and when the crusher is overloaded, a driving belt can slip on the pulley, and damage to the motor and thin parts can be prevented. After the adoption of the handle hold-down device, the steps of restarting repeatedly during the use are reduced, and the working efficiency is improved.