Traction module with adjustable length and pet tractor of traction module

[0032] Example: A traction module with adjustable length limit, such as figure 1 versus figure 2 As shown, it includes a module housing 600, a traction rope 200 arranged in the module housing 600, and a winding mechanism 300 for winding the traction rope 200. Preferably, the free traction rope 200 The end is provided with a metal hook. Wherein, the traction module further includes a shift mechanism 400, the shift mechanism 400 is disposed on the module housing 600, the shift mechanism 400 restricts the traction rope by restricting the movement of the winding mechanism 300 200 can extend the length.

[0033] Such as Figure 2 to Figure 4 As shown, the winding mechanism 300 includes a roller 310, a coil spring 330, and a fixed shaft 320. The roller 310 is disposed inside the module housing 600, and the coil spring 330 is disposed inside the roller 310. The fixed shaft 320 is arranged on the module housing 600 and is located inside the module housing 600, the roller 310 is sleeved on