Safety standards for construction lifts

- Dec 07, 2018-

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The reason why the construction elevator can carry people is mainly because it is equipped with anti-fall safety device, which greatly improves the safety factor. At present, the gear-and-pinion transmission of the utility model is widely used in the construction site, and is equipped with a gear cone-shaped progressive anti-falling safety device. The gear cone-shaped progressive anti-falling safety device is mainly composed of a gear, a centrifugal speed limiting device and a cone drum brake. When the running speed of the protection target (construction elevator cage) reaches the calibration speed, the centrifugal limit The block displacement of the speed device (equivalent to the pawl) drives the cone drum (equivalent ratchet) to move, contact and generate the braking torque to the brake band, while the disc spring group is compressed, and the amount of compression is measured. Determine the braking distance at the rated braking load. The construction industry standard of the People's Republic of China, "Construction Elevator Gear Cone Drum Gradual Falling Safety Device" (JGl21-2000) stipulates that "the construction elevator anti-falling safety device can only be used within the valid inspection period. The safety device is effective. The inspection period shall not exceed two years. The safety device shall be re-inspected and calibrated after the expiration of the effective inspection, regardless of the use or not. The life of the construction elevator anti-falling safety device is 5 years." To ensure the safe use of the construction elevator, at present, Some cities in China stipulate that the construction inspection safety device should not exceed two years after the factory exit, and the annual inspection period should not exceed two years, and whether it is used or not, it must be inspected during the inspection period and scrapped for five years. Construction elevator anti-fall safety device inspection calibration test bench consists of stepless speed regulation device, torque speed sensor, microcomputer torque tachometer, construction elevator anti-fall safety performance tester, drawing printer and so on. Before the inspection and calibration, first decompose the centrifugal speed limit device and the cone drum brake of the construction elevator anti-falling safety device, and check the safety gear speed limit device parts: centrifugal block, centrifugal seat, spring piece, compression spring and adjusting bolt Whether it is intact, the movement is normal, remove oil and rust. For the cone drum brake part, check the large copper nut, screw, cone drum, disc spring, indicating pin, etc., whether the function is normal, remove oil stains and rust.

There are five items in the construction elevator anti-falling safety inspection and calibration: 1. The calibration movement speed measurement, the movement speed should meet the standard requirements; The safety gear and centrifugal speed limit device are installed on the test bench, using stepless speed regulation A test device such as a device adjusts the gear speed at the time when the centrifugal speed limit device of the safety device is opened to a selected operating speed.