2. The adhesive force between rubber roller and iron is low, and the rubber is cracked by impact, and the rubber is torn and broken;
3. Rubber is too soft and hard to crack due to impact;
4. The cots are not concentric or easy to crack due to large torque;
5, cots are not resistant to oil, temperature, high speed and other cracks.
For reference only, technical advice is needed. Baidu Search: Li Xiuquan Studio.