Explanatory letter of Sichuan Kelai Elevator Co., Ltd. on drum brake
As stated in the notice of the general office of the State Administration of market supervision on carrying out special investigation and treatment of potential safety hazards of elevator drum brake (Shi Jian ad hoc letter  No. 564) issued by the State Administration of market supervision on April 14, 2021: "2. Replace the brake release ejector rod of drum brake. In view of the problem that the brake release ejector rod of drum brake made of iron and other magnetic conductive materials swings under the action of electromagnetic force, which is easy to cause brake jamming, we should replace the brake release ejector rod of drum brake made of iron and other magnetic conductive materials with the brake release ejector rod of copper and other non-magnetic materials". Our instructions are as follows:
1. The drum brake release structure of the traction machine produced by our company is equipped with a handle rotation positioning device, so the release ejector rod will not swing under the action of electromagnetic force, and the brake will not be stuck. Just refer to the traction machine maintenance manual of our company The brake can be maintained, disassembled and maintained regularly. Now the relevant maintenance manual of our drum brake is publicized as follows. Please check it!
2. The brake (model: dst150) for the traction machine of model yjf220 / yjf250 manufactured by Changshu Canon after March 30, 2013, which is used for supporting the traction goods elevator products of our company, and the ejector rod is made of 45# steel magnetic conducting material, which needs to be replaced according to the document requirements. The brake of model yjf310 traction machine manufactured by Changshu Canon after May 5, 2019 (model: dsst165), the ejector rod is made of 45# steel magnetic material, which needs to be replaced.
It is hereby explained!
Thank you for your long-term love and support for Sichuan Kelai Elevator Co., Ltd. please contact our quality management department at 0816-5012507 / 0816-5012503 for material replacement and brake troubleshooting.
Quality management department of Sichuan Kelai Elevator Co., Ltd
May 30, 2021