(1) GB7588-2003 Article 12.4.2.1 requires: "all mechanical parts of the brake involved in applying braking force to the brake wheel or disc should be installed in two groups. If a group of components does not work, there should be sufficient braking force to decelerate the car carrying the rated load down at the rated speed. The core of the electromagnetic coil is regarded as a mechanical part while the coil is not. This standard can be understood as "all brake components involved in applying braking force to the brake wheel or disc should be brake pads and compression springs or hammers that produce braking force, which should be divided into two groups according to the above provisions. At the same time, the core of the electromagnet which acts as a braking force opposite to the compression spring applied to the brake wheel must be divided into two groups correspondingly, and there is no correlation between the two groups of cores, and the action should be independent. The regulation does not emphasize two coils, for example, two coils are two sets of brakes. Therefore, in appearance inspection, the hardware mentioned above should meet the requirement.

(2) Article 12.4.2.4 of the GB7588-2003 requires: "the elevator-driven main engine equipped with a manual emergency device should be able to release the brake by hand and should remain in a state of release with a sustained force." When checking, disconnect the main power supply of the elevator, install the disc wheel, 1-2 maintenance personnel hold the disc wheel, another maintenance personnel release the lock with the release wrench, and carry out the rescue disc vehicle release test. Of course, due to the different traction models of different manufacturers, the operation mode is slightly different. If the operation force is greater than 400N or difficult to manually drive the inorganic room elevator, which should be set up emergency electric operation of the electrical operation device.