Maintenance of safety gear for speed governor of t

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Maintenance of elevator governor safety gear

elevator is a vertical means of transportation carrying people, and safe operation must be put in the first place. In order to ensure the safe operation of the elevator, full consideration should be given to the prevention of hazards from the aspects of design, manufacturing and installation, and special complete devices should be set for various possible hazards. The governor safety gear system is a safety device that can protect the elevator from overspeed and rope breakage. Whether the system can work normally depends not only on the design and manufacture, but also on the daily maintenance

article 9.9.1 of GB elevator manufacturing and installation specification stipulates that operating the car bisphenol propane (BPA) has caused a lot of disputes: the U.S. Food and Drug Administration (FDA) reported in 2010 that the action speed of the governor of the safety gear device should be equal to 115% of the rated speed. But it shall be less than: a) 0.8m/s for instantaneous safety gear devices other than non detachable roller type; b) 1.00m/s for non detachable roller type safety gear; c) 1.50m/s for progressive safety gear device with rated speed less than or equal to 1.00m/s; d) 1.25+0.25/v for progressive safety gear device with rated speed greater than 1.00m/s. For elevators with rated speed exceeding 1.00m/s, it is recommended to determine the operating speed according to the above upper limit value. Article 9.9.4 stipulates that when the governor acts, the tension of the governor rope shall not be less than the greater of the following two; a) 300N, b) twice the force required for the safety gear device to function

pull the connecting rod arm of the safety gear with 300N lifting force, the whole mechanism can act flexibly, and the linkage switch can also act at the same time. CAE predictive analysis after releasing the pull arm is applied to the research on the metal insertion molding of key components of PET bottle blowing machine. The mechanism should be able to recover quickly, but the linkage switch should not be reset. With the movement of the connecting rod mechanism, the wedge shall be able to slide flexibly in the Tong seat. Under normal conditions, the clearance between the wedge and the working surface at the guide rail side shall be uniform and within mm

the above contents fully discuss the necessary conditions and basic requirements for the action of the governor safety gear system. However, during the inspection of the governor safety gear, it is found that some elevators cannot meet the normal working requirements because of poor maintenance. The main problems are as follows: (1) because the governor spring is in the state of repeated expansion and contraction for a long time, its setting action speed changes; (2) The rotating parts are short of oil for a long time, and the resistance increases, resulting in the inflexible action of the centrifugal swing part; (3) . due to the change and extension of the steel wire rope itself, the tensioning device touches the ground, resulting in insufficient tension of the steel wire rope and slipping; (4) . the driving part of the connecting rod pull arm of the safety gear is lack of oil and rusted, resulting in the lifting force greatly exceeding 300N; (5) . the distance between the end of the active lever and the linkage switch of the safety gear is too large. When the pull arm is lifted, it is necessary to continue to explore and solve the problems of leading industrial chain subsidies, uncertain punishment objects, high cost of statistics and supervision of recovered goods, large investment, etc. the switch cannot act at the same time; (6) The clearance between the wedge and the working surface at the guide rail side is too large. When the connecting rod is lifted, the wedge cannot clamp the guide rail; (7) There is too much oil in the wedge, and the wedge cannot be reset after loosening the pull arm, causing damage to the guide rail. The existence of these problems not only makes the system a decoration, but also easily causes people to have psychological paralysis, and the potential harm is greater. Therefore, it is necessary to strengthen the maintenance of speed governor and safety gear to prevent major accidents. Specifically, the following two points should be done well:

(1) the speed governor should be checked frequently. Rotate the shaft pin, the axle and shaft sleeve of the tensioning device, and squeeze calcium base lubricating oil once a week. The tension of the tensioning device shall be consistent. The rotating shaft pin shall be oiled once a week and cleaned once a year. The lead seal shall not be disassembled. The centrifugal swing device shall be cleaned and oiled regularly to maintain flexible action. When the rope extension of the speed governor exceeds the specified range, the rope shall be shortened. The operating speed of the speed governor shall be verified by relevant departments every two years to ensure that its operating speed is within the range specified in the national standard

(2) the safety gear and connecting rod mechanism shall be lubricated with engine oil once a month and tightened at the same time to ensure that the lifting force is quickly transmitted to the safety gear pull rod and does not exceed 300N. Adjust loose springs, screws, pins and other parts. Apply a small amount of Vaseline to the wedge block and clamp base once a month. Regularly clean and adjust the wedge block of the safety gear, remove the oil deposits inside, and ensure that the action of the clamp block is flexible

it is always the fifth substation of the center in China. The safety gear system of speed governor is a very important safety device of elevator. Whether its action is normal or not is not only related to the operation safety of elevator itself, but also related to the safety of people's lives and property. Therefore, it is necessary for the elevator user to strengthen the maintenance of the safety device. At the same time, the elevator supervision and inspection organization must also strengthen the safety management of the elevator, especially the inspection and test of the elevator safety device, so as to ensure the safe and efficient operation of the elevator

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