玉树Several methods for eliminating the clearance between gears and racks

The inclined rack drives the "moving table" to move up and down. When it needs to stop, as long as the clutch is disengaged (working), the moving table stops moving while the motor remains running.

The inclined rack mechanism cannot self lock. To prevent accidents caused by the mobile platform falling under the load (gravity) after the clutch is disengaged, a brake is added.

The start switch LS1 and the stop switch LS2 form a start stop self-locking circuit, which controls the output of one section of the relay coil to connect to the clutch; The normally closed contact of the relay is connected to the brake, and the normally closed contact is connected in parallel with the start stop self-locking circuit.

Several methods for eliminating the clearance between helical gears:

When the feed force is small, the double slice gear structure similar to the cylindrical gear transmission can be used to eliminate the clearance by staggering the teeth;

When the feed force is large, the transmission structure of double thick gear is usually adopted. The feed motion is input by shaft 2, transmitted to shaft 1 and shaft 3 through two pairs of helical gears, and then driven by two spur gears 4 and 5 to drive the rack and move the worktable. The spiral directions of the two helical gears on shaft 2 are opposite. If an axial force F is applied to shaft 2 through a spring, causing a slight axial movement of the helical gear, then shaft 1 and shaft 3 rotate in opposite directions by a small angle, causing gears 4 and 5 to be in close contact with the two tooth surfaces of the rack, eliminating the gap.