What is the reason why Mitsubishi elevator door knife hit the sill?

1, the height of the elevator sill was adjusted, and the height adjustment between the elevator door knife and the sill was inaccurate, resulting in the collision between the door knife and the sill when the door was closed.

2. When the running speed of the elevator door does not match, and the opening and closing speed of the elevator door does not match the running speed of the elevator, the door knife cannot be flush with the sill in time, resulting in collision.

3. The elevator door knife is worn or damaged. The elevator door knife will be worn or damaged after being used for a long time, resulting in the door knife not being completely closed or aligned with the sill.