According to the China National Intellectual Property Administration (CNIPA), Zhejiang Chuangli Auto Air Conditioning Co., Ltd. has applied for a patent entitled "A Small-Span Pipe Bending Device", with publication number CN121198865A and filing date September 2025.

As shown in the patent abstract, the present invention relates to the field of pipe processing and discloses a small-span pipe bending device. This device can prevent uneven stretching and damage to the pipe wall. The hydraulic rod in the actuating mechanism is linked with the actuation head to monitor the bending stress of the pipe in real time. In case of uneven stretching of the pipe wall, the negative pressure difference in the hydraulic rod will lead to different sliding distances of the actuation head, pausing the movement of the actuating housing. The operation resumes only when the bending pressure becomes uniform, so as to avoid thinning, scratching and tearing of thin-walled pipes or pipes with poor plasticity. Meanwhile, the device features high versatility: it ensures that the anti-slip gaskets abut against the inner wall of the pipe; the tensioning pulley automatically adjusts the tightness of the transmission belt to prevent failure; the adjusting bolt controls the expansion degree of the adjusting bladder to adapt to pipes of different lengths, eliminating the need for frequent mold changes. It also guarantees bending accuracy and reduces the defective rate. The actuating head clamps the inner wall of the pipe to prevent indentation, and the expansion hydraulic bladder fixes the actuating mechanism to avoid shaking. Cooperating with the pipe bender, it precisely controls the bending angle and automatically completes the bending process without repeated adjustments, ensuring consistent dimensions of batch-produced pipe fittings and facilitating subsequent assembly.

Data from Tianyancha shows that Zhejiang Chuangli Auto Air Conditioning Co., Ltd., established in 2006 and located in Lishui City, is an enterprise mainly engaged in the automobile manufacturing industry, with a registered capital of 5 million RMB. Based on big data analysis by Tianyancha, the company has participated in 3 bidding and tendering projects. In terms of property-related information, it owns 3 trademarks and 48 patents, as well as 3 administrative licenses.