Transmission adjustment structure, casing and tiled display device

A transmission adjustment structure, comprising:

• a shell, a rotation part, a transmission part, and a response part, wherein an adjustment hole exposing one end of the rotation part is provided at a position on the shell corresponding to the rotation part, and the other end of the rotation part is connected to the transmission part;
• a guide hole exposing one end of the response part is provided at a position on the shell corresponding to the response part, and the other end of the response part is in contact with the transmission part;
• the rotation part is configured to rotate in response to controlling by an external tool on the end of the rotation part exposed by the adjustment hole;
• the transmission part is configured to move along a first direction in response to rotation controlling of the rotation part, and the first direction is an extension direction of the transmission part;
• and
• the response part is configured to move along a second direction in response to movement of the transmission part, the second direction intersects the first direction to adjust an amount of protrusion of the response part in the guide hole.