1: anti-fall safety device
Anti-fall safety device is an important part of the construction lift, to rely on it to eliminate the cage fall accident, to ensure the safety of the lives of passengers. So for safety device factory test is very strict, before delivery by the statutory inspection unit for torque measurement, critical speed measurement, measuring the amount of spring compression, each with the test report, after assembly to the construction lifter for drop test under rated load, and the site USES the elevator must test every three months a drop test. For safety device to the factory for two years, must also be sent to the statutory inspection unit testing experiment, after the test once a year, so far few inspection, some sites even once every three months to detect don’t do drop test, all no problem for safety device for themselves, but once had an accident, repent at leisure. Why not have regular test and inspection according to the system? Use unit blindly artificial not bad even if good. Actually prevent fall safe implement stand or fall is good or bad can judge through test and send check ability, it is cannot decide whether its stand or fall in daily operation, to those exceed the period of service to prevent fall safe implement, the proposal still is early send check and periodic test had better, accomplish only know fairly well, ability prevents maimed accident at did not ignite.
The safe switch of elevator is designed according to safe need, have fence limit position, condole cage limit position, top door limit position, limit position switch, upper and lower limit position switch, to prevent heavy break rope to protect switch to wait. In order to save trouble on some construction sites will be a number of limit switch artificial cancellation and short connection or damage after timely repair, is equal to the elimination of these other lines of safety defense, planted the hidden danger of the accident.
Gear, rack wear replacement
The construction on the site, working environment conditions are bad, cement, mortar, dust is impossible to eliminate clean, gear and rack of mutual grinding, teeth are sharpened is still in use, should cause attention. As we all know, the tooth shape should be like a cantilever arm, when wear to a certain size, you must replace the gear or rack.
The buffer on the construction lift is the last line of defense for the safety of the construction lift. Second, it must have a certain strength, can withstand the lift rated load of the impact, and play a buffer role. And now a lot of sites, although some have Settings, but not enough to play the role of buffer, there is no buffer on some sites, this is extremely wrong, hope to use the unit to pay attention to check, do not despise this last line of defense.
Stop at the safety door on the floor
Safety doors shall be installed at each parking floor of the construction lift. It is obvious that if not set according to the requirements, the construction personnel waiting in the height of the accident is very likely to fall. When setting the parking safety protective door, the height of the safety protective door shall be guaranteed not less than 1.8 meters, and the layer door shall have interlocking device, and the protective door shall not be opened to ensure the safety of operating personnel when the cage stops at the position of the layer in the future. And the personnel that waits for construction elevator to be able to open safe safeguard door at any time commonly exists on the site, this is very dangerous, should cause take seriously.
Overvoltage, undervoltage, phase fault protection
Overvoltage, undervoltage, phase fault protection device is in the event of voltage drop, overvoltage, electrical circuit phase fault and phase fault, protection device action, construction lift stop operation. Some construction site lift maintenance personnel, do not timely eliminate the fault caused by underpressure fault fault phase protection device action, but the protection device cancelled or short connection, but it does not work, to leave the equipment accident hidden trouble, there are some early products do not have the protection device, the proposal should be equipped with. Construction lift should be under – pressure, fault – phase protection device reliable and effective in the case of manned fog.