When setting up workpiece or checking the workpiece machining result, the work tank can be conveniently accessed from three sides. This provides an interference-free working space for fast immersing and draining of fluid. The work tank height can be controlled by the operator, leading to time-saving and effort-saving and increased convenience of operation. Accessible space design and programmable height control of the work tank; Enable closer machine operations from three different directions and easily to in and out workpiece by robot.