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        Safety Precautions lifts

        Number of visits: Date:2014年1月23日 08:52

        1 safety device
        Safety device is a component of the construction elevator important to rely on it to eliminate the cage fall accident occurs , to ensure the safety of the occupants . So safety device factory test very strict inspection before shipment from the statutory torque units to measure it , the critical speed measurement, measurement of the amount of compression springs , each comes with a test report on the construction of the lift assembly after falling under the rated load test , and the use of the site must lift drop test will be carried out once every three months . Two years of factory safety device ( anti-fall safety device on the date of manufacture ) , must also be sent to the statutory test unit testing , later tested once a year. So far very few people will be inspected, and some sites even tested once every three months, the drop test is not done , all that their safety device is no problem, but once an accident on regret. Why do not regularly test and inspection by the system? Blindly believe that the use of units is not bad even better. In fact the quality of safety device can only be judged by the quality of testing and inspection , routine operation can not determine whether it is good or bad , for those extended service safety device , the proposal is still early and periodic inspection test as well, just be aware of the serious accident to take preventive measures .
        2, the safety switch
        Lift safety switches are designed according to the security needs , fenced door stopper , hanging kennel limit , Dingmen limit , limit switches , upper and lower limit switches, protection against heavy anti broken rope switch. Some on the site in order to save some of the limit switch and the short man canceled or damage is not repaired in time , it means abolition of these line of defense , planted accidents. Example : To mount long cage thing , hanging cage to fit the need extends outside the cage , and artificially limit or cancel the door Dingmen limit , in the above security facilities, inadequate or incomplete good condition , still manned loading such illegal operations Helenians life is a joke , in order to avoid the occurrence of accidents , want to use the unit leaders to strengthen the management , maintenance and operation of the lift strict requirements regularly check the safety and reliability of various safety switches , to prevent accidents.
        3 , gears, rack wear replacement
        Construction , operation in harsh environmental conditions on site , cement, mortar, impossible to eliminate dust and clean , mutual grinding gears and rack teeth are sharpened still in use , should pay attention to. As we all know , the tooth should be like a cantilever , when worn to a certain size , you must replace the gear ( or rack ) . To what extent should wear replacement stop using it ? Can be used 25-50mm normal line micrometer measurements , when the normal length gear wear less than 35.1mm by 37.1mm in size ( two teeth ) to it must be replaced with new gear . When the rack wear, the caliper measurement of tooth thickness , chord when the tooth thickness from 8mm to wear less than 10.6mm to 12.56mm , rack must be replaced, but the site a lot of " old-fashioned " gear rack lift extended service still in use , for safety reasons, must be replaced with new parts .
        4, the duty cycle is defined
        Frequently lift on the job site , high utilization, but had to consider the problem intermittent duty motor , which is a problem often said duty cycle (sometimes called duty cycle ) which is defined as FC = work cycle time / load time × 100%, wherein the working load cycle time and downtime . Some lifts are on site rental company rented, always want to take advantage of , and the motor 's duty cycle (FC = 40% or 25% ) completely disregard the motor how not heat it? Emerge even some coke paste flavor is still in use , which is very normal operation. If the transmission poor lubrication or run too much resistance , overloading the use, or for frequent start , it is a small horse-drawn carts . So every driver on the site must understand the concept of duty cycle , according to scientific laws , this motor itself is designed by intermittent operation .
        5 , the buffer
        Construction elevator safety last line of defense on the bumper of construction lifts , first , it must be set , and second, it must have a certain strength to withstand the impact of the rated load of the lift , and a cushioning effect. And now a lot of the site, although some settings, but not enough to play a buffer role , there are absolutely no buffer to the site , which is extremely wrong , you want to use the unit for inspection note , do not underestimate this last line of defense.
        6 , floor security door stops
        Each layer construction elevator stops should be set to dock security gates. Obviously if you do not follow the requirements set in the height of construction workers waiting accidents are prone to accidental falls . When setting docked security doors, security doors should ensure a high degree of not less than 1.8m, and the landing door interlocks should be in the position of the cage yet reached the stop layer , protective door can not be opened , to ensure worker safety. At present, the site of widespread construction elevator wait staff ready to open the security door, which is very dangerous and should pay attention to.
        7 , base fence
        When "basic fence shall be equipped with mechanical or electrical interlock interlock interlock mechanism should be made only at the position at the bottom of the cage prescribed basis in accordance with the provisions of the fence to open the door GB10055 , the electrical interlock should be made to open the protective fence cage parking and can not start . " There are quite a lot of construction lifts, close to the fence when the cage door , the bottom of the cage to suppress a beam running down the rope pulley driven by the commutation fence doors open up , which is not allowed , it is easy to outside the fence near people hurt.
        8 , Rope
        Various parts of the rope rope should be a reliable connection, such as pouring weaving, forging and using a wedge fasteners , such as using the U- Shengka not less than three , the number and Shengka Shengka spacing and wire diameter , but not with rope diameter the number of matching Shengka rope diameter < 1010-2021-2628-36 minimum number Shengka 3456.
        Pitch Shengka not less than six times the diameter of the wire rope , rope length from the last Shengka not less than 140mm, and be bundled with a fine wire, Shengka rope pulley on the work force side , U -bolt buckle in the end of the rope shall be set Shengka pros staggered , fixed rope by force Shengka before , the force again after tightening . But many sites because of security consciousness, when using Shengka fixed Shengka number , the card away , set between the ropes , tail length arbitrary, not according to the standard , would have resulted in only 80 % -85 % discount fixed to the strength of the joint , a security risk .
        9 , the top of the control box cage
        The provisions of GB10055 " cage should have a top overhaul or disassembly using the control box , and has in the case of multiple speeds only allowed to not more than 0.65m / s speeds. At the top of the control box using hoists , the other operating devices are no effect at this time safety device hoists still play a protective role . cage top constant pressure control should be used to operate a button or bistable switches , hoists should be installed on top of non- self- reset trip switch off at any time of the circuit , stopping hoists action . " This is a major lift for the SC -type construction , few companies can meet the five products that section : includes some well-known design units designed products. Does not meet the five requirements , what is wrong with that? Likely due to the installation, maintenance personnel misuse , causing accidents. Hope that the use of units for the construction of the lift control checks carried out , especially the old products do not meet the above requirements should take active measures to transform.
        10 , overvoltage , undervoltage , wrong phase protection
        Overvoltage , undervoltage, wrong phase protection device is when there is a voltage drop, overvoltage , electrical lines appear out of phase and phase failure, protective devices , construction lifts stop running. Some of the construction site on the lift maintenance personnel , not timely exclude faults caused by over voltage fault phase protection device movement , but the protective device to cancel or short , it does not work, leaving accidents to the device , there are some early the products do not have protection devices, proposals should be equipped . Construction should lift over voltage , wrong phase protection device reliable and effective under the circumstances be manned operation thereof.

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