What are the technical standards for lifts? They are summarized as follows:
(1) The elevator standard section is the spine of the entire lift and carries the weight and cargo movement of the machine itself. The cage is reciprocated up and down with the standard section pillars. Therefore, there are high requirements for the technical dimensions of the attachment and reinforcement joints, and the joints between the guide rails and the racks. It is necessary to ensure that the misalignment steps at the butt joints of the standard section columns are ≤0.5 and ≤0.3, respectively. At the same time, the step difference between the adjacent two racks along the tooth direction is ≤ 0.3, and the difference along the length is ≤ O.6.
(2) After the guide rails and racks on the standard section are installed for the first time, the bolt posts are screwed or fixed by the manufacturer. The role and requirements of the standard section require fewer text files for random manufacturers, and there are not many normative standards and theoretical descriptions of the standard section. Peacetime safety education, safety inspections, and technical disclosures are less of a requirement. The unconscious mind believes that the standard knots are not easily deformed, and therefore the fastening of the connecting bolts is neglected in the assembly of the standard knotted assembly.
In recent years, with the development of the construction industry and the popularization of high-rise buildings, the use of elevators has increased, and the workload of installation (disassembly) has increased. In order to rob the speed, labor-saving and time-saving installations often occur.
(3) In particular, the assembly joints of the lift standard section are dismantled, the overall transportation, and the overall installation are liable to cause the standard section connecting bolts to be false and firm. At this time, the firm tightening torque of the standard section bolts is mostly <350 N·nl. Hydraulic lifting platform during the installation of the standard section, the height of the standard section up to 10.5m after installation, with the installation of a piece of standard assembly section. False screwing will be buried.
Lifting cage load up and down reciprocating Acceleration of bolt loosening can easily lead to the error of the parallelism of the two guides and the coincidence of the centerlines of the two guides >2mm. Under the influence of other forces that are not fixed, there will be blockage or throwing of counterweights at the moment, the wire rope will be broken, the gap between the guide wheels will become larger and smaller, and the vibration and noise of the cage will increase. An accident that should not happen. The machine was destroyed and the loss was huge.