Cable length measurement device

A cable length measurement device, configured to:

• be connected a winding wheel and measure an extension or retraction length of a cable on the winding wheel, and comprising:
• a fixed shell, a rotating shell, and a control panel, wherein the rotating shell is rotatably connected to the fixed shell, and the rotating shell is configured to be connected to the winding wheel and rotate around a rotation axis with the winding wheel;
• one of the fixed shell and the rotating shell is provided with a signal transmitter, and the other one of the fixed shell and the rotating shell is connected to the control panel;
• the control panel is provided with a signal receiver;
• when the signal transmitter passes through the signal receiver, the signal receiver generates a counting signal, and the control panel receives the counting signal to calculate the extension or retraction length of the cable on the winding wheel;
• and
• at least two signal transmitters are provided, which are arranged in an equal spacing manner in a circumferential direction of the fixed shell or the rotating shell;
• alternatively, at least two signal receivers are provided, which are arranged in an equal spacing manner in a circumferential direction of the fixed shell or the rotating shell.