Collection! Standard Process for Replacing Elevator Wire Rope



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Collection! Standard Process for Replacing Elevator Wire Rope


1. All personnel engaged in this work must hold the elevator maintenance certificate issued by the Labor Bureau, hold the certificate, and have a person with a certain professional and technical level to do the unified command.
2. Hang warning signs such as "Elevator repair shall not be used" in front of each hall of the repaired elevator and "It is forbidden to close the elevator" on the main power switch of the elevator in the machine room. The hall doors on the first and top floors shall be surrounded by yellow signs and listed: "Hazardous areas are not allowed for irrelevant personnel.
2. The staff engaged in this project shall wear relevant safety protection articles, such as insulating shoes, safety helmet, safety belt, etc., and check the safety and reliability of the protection articles.
3. Prepare sufficient repair tools (as expected by an elevator) and related equipment, as follows:
(1) steel wire rope: ф 6mm, 15 meters long 1, 1.5 meters long 2 (for hanging car).
(2) wire: ф 5mm, 10 meters long 1 root.
(3) spring said: weighing range of 0~25kg.
(4) two interphones.
(5) babbitt alloy 3kg.
(6) A blowtorch gun (gasoline or kerosene blowtorch).
(7) 10 wire rope clips.
(8) supporting counterweight steel pipe: ф 0 ~ ф 50mm, length 1.5~1.8 meters 2 (should be able to bear more than 3 tons).
(9) chain block: one with a load of 1.5~3 tons.
The above tools need to be fully and carefully checked before construction to confirm the quality and safety standards before use.
Main Technology and Safety Process of 2. Replacement of Wire Rope
  1. The personnel are divided into two groups, with at least two people in each group, with walkie-talkies. One group of machine room will drive the elevator car to the top floor, cut off the power supply after leveling, and notify the other group to enter the bottom of the well.
    The pit group first cuts off the "emergency stop" switch at the bottom of the well, and measures the distance from the counterweight lower beam strike plate to the buffer for reference by cutting and changing the length of the rope. Place one end of the counterweight and load-bearing steel pipe on the ground, align the other end with the lower beam of the counterweight, turn on the "emergency stop" switch at the bottom of the well, and use interphone to inform the personnel of the machine room to run the elevator slowly upward until the counterweight frame is completely pressed on the steel pipe, so that the elevator cannot run slowly upward.
    The machine room group cuts off the main power supply and hangs a sign board, then hoists the car with a chain block and a wire rope (the wire rope shall pass through the hoisting steel ring on the top of the machine room, and pay attention to the material on the hoisting ring mouth to increase the contact surface), and uses a chain block to make the speed limiter move manually (causing the car safety gear to move, and then lower the hoisted car a little bit to make the safety gear wedge firmly on the guide rail).
2. After the first item is completed accurately, first remove 1/2 of the elevator traction steel rope, lay it flat on a relatively flat ground, and remove the rope head taper sleeve. According to the original wire rope length, and refer to the measured distance between the beam and the buffer under the counterweight. When cutting the new elevator special wire rope, attention should be paid to: the newly purchased wire rope should be carefully checked to see if there is a product certificate
book, whether the diameter is the same as the original one, and the elevator special type (8 × l9 strands, thick outer strands and thin inner strands); Whether it conforms to the national standard, excessive friction on the ground cannot be prevented from damage during shearing and measuring rope length.
3. Thread the new rope into the taper sleeve, tie it tightly with thin iron wire rope at 120mm, cut off the hemp core in the middle of the 8 strands of rope separately, bend each strand of steel wire into the required shape, and pull the wire rope into the taper sleeve with force. The wire rope should be slightly lower than the taper sleeve and should not expose the sleeve surface.
4. Use tape to wrap on the cone sleeve to avoid leakage when pouring babbitt alloy. Then preheat the cone sleeve head to 40~50 ℃ with flame to remove miscellaneous oil. When casting, a torch or oxygen acetylene welding torch can be used as the heat source. First, a little solder paste is put into the cone sleeve, and then the babbitt alloy is heated to 270~350 ℃. After the surface oxide of the alloy is removed, the alloy can be poured into the cone sleeve, and the solidification of the alloy is completed. Then the hoisting rope is suspended for 3~6 minutes to fully relieve the stress such as torsion or bending.
5. Assemble 1/2 of the new traction wire ropes that have been made as they are, and then remove the other 1/2 of the old traction wires as they are made according to items 3 and 4 above, and then assemble them as they are. Then use the chain block to pull the car up about 80mm, restore the speed limiter and safety gear to the normal position, and then pull the chain block to lower the car, so that all the steel wires are stressed. At this time, correct the rope head bolts on the car side and the counterweight side so that the difference between the tension of each traction rope and its average tension is less than or equal to 5% (the tension needs to be detected by a spring scale).
After the above contents of the 3. test run are qualified, make the elevator slowly inching down by about 0.5mm, and notify the pit team personnel to enter the bottom of the well and take out the two steel pipes with top counterweight, so that the steel wire rope is fully stressed. At this time, further adjust the tension of the traction rope and enter the car roof to carefully check whether the arrangement position of the changed traction rope is correct. After the correct can make the elevator slow whole run again, and then turn to fast test run.
4. test
1. Elevator static load test: passenger elevators, medical elevators and freight elevators under 2 tons carry 200 per cent of the rated load, while other types of elevators carry 150 per cent of the rated load. In the stop state, move in the heavy objects with the specified load, and bear the load for 10 minutes without damage to each load-bearing member, the traction steel rope without sliding displacement, and the braking is reliable.
2. Traction capacity test.
In the following equivalent to the most serious elevator braking situation, stop several times for traction inspection, each time the car should be able to completely stop.
(1) The car carries 125 per cent of the rated load at rated speed down to the lower range of travel.
(2) The car goes up to the upper range of the stroke at the rated speed without load.

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