What are the methods and tips for elevator fault maintenance?

Elevator has become a necessity in people's life, and it will be used anywhere. So how to repair the faulty elevator? The following is the elevator maintenance method compiled by Zhishi Bian Xiao for you, hoping to help you.

Elevator maintenance method. Mechanical system failure

(1) The common failure phenomena and causes of mechanical systems are as follows.

1, due to poor lubrication or lubrication system failure, the rotating parts of the parts are seriously heated, worn or locked, resulting in damage to the rolling or sliding parts.

2. Due to the frequent use of the elevator, some parts are worn and aging, and the maintenance is not in place. The worn parts cannot be replaced or repaired in time, causing further damage and forcing the elevator to stop.

3. During the operation of the elevator, some fastening screws are loosened or loosened due to vibration, which causes some parts, especially moving parts, to work abnormally and damage the elevator.

4. Due to the unbalanced balance coefficient of the elevator, or serious overload, the car shakes greatly or the leveling accuracy is poor, and the elevator speed is out of control, even rushing to the top or bottom, resulting in the linkage of the speed limiter and the safety gear, and the elevator stops.

(2) When the elevator mechanical system fails, the repairman should know the situation and phenomenon of the failure from the elevator driver, administrator or passengers. If the elevator can still run, the driver/administrator can make the elevator run up and down by inching, and the maintenance worker can analyze and judge the fault point by listening, touching and measuring.

(3) After the fault point is determined, disassemble, clean, inspect and measure it carefully according to the requirements of relevant technical specifications, determine the cause of the fault through inspection, and repair or replace the parts according to the degree of wear and damage.

(4) After the elevator parts are repaired or replaced, they must be carefully inspected and debugged before they can be delivered for use.

Second, the electrical control system failure and repair

(1) Common faults of electrical control system

1. From the scope of elevator electrical faults, the most common ones are the fault of portal crane system and poor contact of electrical components. The main reason for the failure of portal crane system and electrical components is components.

Quality, installation and debugging quality, maintenance quality, etc.

2. According to the nature of electrical faults, there are mainly short circuits and open circuits. Short circuit is that for some reason, the circuit that should not be connected is connected or the resistance in the circuit is very small after connection. The common cause of elevator short circuit fault is that the mechanical and electronic interlock of directional contactor or relay fails, which may cause contactor or relay to grab and cause short circuit; When the main contact of the contactor is turned on or off, the generated arc causes the dielectric of the surrounding dielectric electrical components to be broken down and short-circuited; Short circuit caused by aging, failure and moisture of insulation materials of electrical components; Due to external reasons, the insulation of electrical components is damaged, and foreign bodies invade to cause short circuit. Open circuit is because for some reason, the circuit that should be connected is blocked. The main reason for the open circuit is that the lead of electrical components is loose; Virtual welding or poor contact as a connection point in the loop; The contact of relay or contactor is burned by electric arc; The contact surface consists of an oxide layer; The contact reed is heated by the arc generated when it is on and off, and loses its elasticity after cooling, resulting in insufficient contact pressure of the contact; When the relay or contactor is closed or disconnected, the contacts are in poor contact due to jitter and other reasons.

(II) Judgment and elimination of faults in the electrical control system The basis for judging faults in the electrical control system is the elevator control principle. Therefore, in order to quickly troubleshoot, we must master the circuit schematic diagram of the regional control system, and understand the working principle of each link in the whole elevator process from the aspects of orientation, starting, acceleration, full-speed operation, arrival prediction, speed change, leveling, switch door, mutual control relationship between electrical components, the role of electrical components, relays/contactors and their contacts. Before judging the elevator electrical control fault, we must deeply understand the fault phenomenon, so as to quickly and accurately analyze and judge the fault cause and find the fault point according to the circuit diagram and fault phenomenon.

Elevator maintenance 1 routine maintenance items and requirements.

1. 1 routine maintenance items and requirements of the base station lobby.

1. 1. 1 The external selection button has normal appearance, no skew, no defects and is firmly fixed. The button is flexible without jamming. When calling for floor selection, the floor selection memory light is on and can be kept until the elevator is turned on.

1. 1.2 base station floor light The elevator runs up and down once, and both the base station floor light and the direction light are on, indicating correct.

1. 1.3 The key switch and fire switch are normal in appearance, firmly fixed, free from defects, effective and in correct state.

1.2 routine maintenance items and requirements in the car.

1.2. 1 The lighting in the fan car is complete, the switch is sensitive to start, the ballast has no abnormal sound, the lamp tube has no flicker, and the fan operates normally.

1.2.2 communication facilities and alarm bells, telephones or walkie-talkies are clear. The alarm button is flexible, free of jamming and normal in sound.

1.2.3 The ceiling, wallboard and floor ceiling are complete, and the installation is firm and there is no possibility of falling off, and the elevator runs without vibration; Car wall is firm, without cracking and serious deformation; The car floor is flat, without deformation and damage.

1.2.4 The buttons on the button control panel are normal, flexible and free from jamming. After all the selected buttons are pressed, all the signal lights are on except this floor.

1.2.5 The door switch is normal, and there is no abnormal sound, jamming or large shaking during the switch process. What is the gap between the door panel and the door cover 6? 2_, the ladder in Japan is 5? 2_, the gap is even.

1.2.6 safety relay protection facilities such as safety relay contact plate are intact and correct. All moving parts are lubricated normally, and there is no noise when opening and closing the door and running.

1.2.7 Run the elevator up and down for trial operation. During operation, the car will not shake and there will be no abnormal sound in all parts.

1.2.8 The interior lights and standby lights for power failure are clean and normal in appearance, and the direction and floor indication are correct. When the elevator is powered off, the standby light can be on continuously for more than 15 minutes.

1.3 routine maintenance items and requirements of other floors.

1.3. 1 The exterior buttons and indicator lights on each floor are normal in appearance, in good contact, flexible in button action, omni-directional in indicator lights, and firmly installed without defects.

1.3.2 the hall doors and door covers of each floor are clean without large deformation, and the gaps between door panels and door panels and door covers meet the standards (domestic ladder 6? 2_; Japanese ladder 5? 2_), there is no jam in the process of opening and closing the door.

1.4 routine maintenance items and requirements of elevator equipment in machine room.

1.4. 1 warning signs and outside the door lock room? The computer room is important and no one is allowed to enter? Warning signs are clear and eye-catching, and the door lock works reliably.

1.4.2 The lighting, passage, floor and roof of the machine room are in good condition and the lighting is normal. The passage is clear, the ground is free of foreign bodies such as dust, the roof does not leak rain, and the doors and windows do not enter water.

1.4.3 ventilation and fire fighting equipment room ventilation equipment is in good condition; Fire fighting equipment is complete and intact. Each elevator is generally not less than two fire extinguishers, which are used for electrical fires.

1.4.4 When the elevator stops, the turning tools should be complete, applicable and placed in an obvious position.

1.4.5 All kinds of instruments and indicators in the instrument and indicator control cabinet and excitation cabinet have complete appearance and normal indication.

1.4.6 Brake Brake surface is clean, brake pads are free from oil stain and aging, and the gap between brake pads and brake drum is even on both sides. Domestic ladder? 0.7_, Japanese ladder? 0. 15_。 There is no loud crash when braking.

1.4.7 speed limiter The speed limiter has a clean appearance, no oil stain and no abnormal sound during operation. There is no oil accumulation on the jaw, and appropriate amount of engine oil should be added to each running part.

1.4.8 The exterior of generator set, motor and traction machine shall be clean and free of dust and oil stain, and there shall be no abnormal electrical sound and sparks during operation. The temperature rise is normal and there is no peculiar smell.

1.4.9 gearbox, shaft head and various oil cup gearboxes have sufficient oil, which is within the scope of oil dipstick; The oil level of the shaft head is between the oil mirror lines; The oil in each oil cup should be sufficient and clean.

1.4. 10 main contactor, main relay main contactor and main relay work normally, without noise, odor and overheating.

1.4. 1 1 The tachometer belt is in good condition and the broken belt protection switch is reliable.

1.4. 12 The operating parts of the layer selector and steel belt layer selector rotate flexibly, the lubrication is normal, and the steel belt runs without noise.

1.4. 13 copper head and carbon brush copper head are free of carbon deposit, scratch and overheating. The length of carbon brush is appropriate (carbon brush rivet should be updated when it is less than 5mm to the working face). Spark is normal during operation, and there is no abnormal sound and vibration.

1.5 routine maintenance items and requirements of car roof and hoistway.

1.5. 1 The car roof and lighting car roof are clean without sundries, the lighting is normal, and the safety relay guardrail is firm.

1.5.2 The switch of the service box is in good condition, the contacts are normal and the position is correct.

1.5.3 All switches of window, steel belt and pressure plate switch are normal in appearance, free from looseness and in normal use.

1.5.4 The oil level of the automobile fuel tank and heavy oil is between 1/4-3/4, the oil quality is clean and the fuel tank is firmly fixed.

1.5.5 The guide shoe is silent during operation; Roller guide shoes are free from cracking and degumming.

1.5.6 The upper limit switch and the upper limit switch operate normally, and the roller rotates flexibly and the position is correct.

1.5.7 The rope ends of traction rope, balance rope and balance chain are firmly connected, the pins, nuts and cotter pins are complete, the spring is not broken, and there is no abnormal sound during operation.

1.5.8 The door crane of the car door mechanism rotates without noise, the door opening and closing speed is normal, the door guide rail is free of scale, and all moving parts are lubricated normally.

1.6 pit daily maintenance project.

1.6. 1 The maintenance switch and lighting maintenance switch are reliable, the lighting in the pit is normal, the switch and lighting facilities are complete, and the installation is firm.

1.6.2 Buffer Spring Buffer is firmly fixed, the spring is free from crack or skew, the plunger stroke meets the nameplate requirements, and the oil level is normal.

1.6.3 The tensioning arm of the speed-limiting rope tensioner and the steel belt tensioner are basically perpendicular to the track, the tensioner operates normally without noise and friction, the position of the rope-breaking switch is accurate, and the tensioning track meets the requirements. This distance requirement: domestic ladder: high-speed ladder 750? 50_, express ladder 550? 50_, low-speed ladder 400? 50_; Japanese ladder 200? 50_。

1.6.4 The lower limit switch and the lower limit switch operate normally, the roller drive is flexible, the position is accurate and the installation is firm.

1.6.5 overload switch lamp or bell (with this device) is firmly fixed, and there is no jam when switching. When this switch is pressed, the overload lamp or bell will work.

1.6.6 the head of the balance rope and the balance chain balance rope are fixed firmly and reliably, and the distance between the base of the balance rope tensioner and the ground channel steel meets the requirements (generally more than 200_). When the elevator is running, its tensioner runs normally and floats up and down flexibly; The position of limit switch is accurate. The distance between the balance chain and the ground is more than 200_, and there is no abnormal sound during elevator operation.

1.6.7 When the car and pit along the line stand on the lower floor, the distance between the elevator along the line (along the cable) and the ground of the pit is more than 60mm and less than 350 mm ... The pit is clean and watertight. Tighten the bolts of the heavy protective net.

2 Items and requirements for regular maintenance.

2. 1 Regular maintenance items and requirements of the computer room.

2. 1. 1 Inspection found that the unit, exciter, DC motor and its carbon brush.

First stop to check the project:

(1) Clean the scale on all parts (when cleaning the commutator, only use a brush and a dry cloth, not a liquid detergent, or a sharp tool harder than copper);

(2) Check the carbon brush for defects. See figure 1 for the length of carbon brush (from rivet to working face). If it is less than 5mm, it should be replaced. When replacing, pay attention to the study of specifications and working face;

(3) Check whether the carbon brush wiring is loose and whether the screws of each part are tightened. The carbon brush is in contact with the commutator, and the contact surface should be greater than 60% of the surface of the carbon brush. Check the surface roughness of the commutator and don't scratch the commutator. If it has been scratched, it can be polished with emery cloth when the scar is shallow; When the scratch depth exceeds 0.5mm, it is necessary to remove the heavy vehicle. After heavy vehicle repair, the undercut depth between commutators should meet the requirements (> 1mm). There should be no carbon deposit in the fuel tank.

(4) The pressure of the brush spring should be appropriate and too tight, and the carbon brush should grind the block; Too loose, poor contact, big spark.

(5) For bearing oil change and rolling bearing oil change, grease with working temperature within the range of 100℃ ~ 120℃ is generally selected; 20# oil is generally used for sliding bearings. The oil tank of the shaft head shall not be lower than the center line of the oil mirror.

(6) Measure the insulation of the motor coil with a 500-volt megohmmeter. The insulation resistance of the stator coil to the ground is not less than 0.5 megohmmeter, and the insulation resistance of the rotor coil to the ground is not less than 0.25 megohmmeter.

When the elevator is running, check the following components:

(1) Whether the elevator has abnormal noise and vibration; The coil temperature rise should not be higher than the nameplate.

(2) Whether the carbon brush has sparks and whether the sparks are normal.

(3) Whether the shaft head leaks oil; Bearing temperature rise is not higher than 60℃.

2. 1.2 traction machine.

(1) Clean all parts and check the oil quality. It is normal for the shaft head with packing seal to drop a drop of oil every 3-5 minutes on average. Too much or too little is not good. The shaft head with sealing ring should not leak oil, and other connecting parts should not leak oil.

(2) Check the wear of worm wheel and worm and the clearance between teeth. The axial running momentum of the worm shaft should be less than 2mm (it can be indirectly measured: the car descends a certain distance from the idle train at the last station, and the length of the traction rope moving in the opposite direction should be less than 5mm when stopping).

(3) Check whether the traction sheave groove is worn or deformed. Wear of each rope groove shall be consistent. When the wear depth difference exceeds110 of the rope diameter, it should be repaired to the same depth, otherwise the traction sheave should be replaced.

(4) Check whether the bolts of each part are tightened.

(5) Check whether there is noise during operation and vibration during parking.

2. 1.3 brake decomposition.

(1) Remove the moving parts of the brake, check the wear of the brake core, and add a proper amount of corresponding lubricant after cleaning.

(2) Check the wear of the brake drum and brake pads. Wear of brake pads exceeds 1/4 of the original thickness, rivets are exposed, and brake pads are aging. Brake pads should be free of oil.

(3) When the brake coil is energized, the gap between the brake shoe and the brake drum should be uniform (the gap on each side of the domestic ladder should be less than 0.7mm, and that of the Japanese ladder should be 0. 15mm).

(4) Brake core stroke, the stroke of a single brake core should be about 2mm; The stroke of double brake cores should be about 1.5mm on each side.

(5) The spring pressures on both sides should be equal.

(6) Tighten all terminal screws.

(7) The opening distance of the brake electric contact should be between 1.5 ~ 2mm. Check the contacts for shedding, ablation and sparks.

2. 1.4 layer selector and its transmission mechanism.

(1) Clean all parts of the layer selector and its transmission mechanism.

(2) The movable contact plate (rod) should be flexible, and appropriate lubricating oil should be added according to the situation. Replace the reducer and all parts or add corresponding lubricating oil, and check and adjust the tension of the transmission chain.

(3) When the transmission steel belt has broken teeth and cracks, it should be replaced or repaired in time. Steel belts should be coated with a thin layer of engine oil to prevent corrosion.

(4) Check whether the screws are tightened and the wiring is reliable. When necessary, the contact reliability and pressing force of the static contact should be adjusted appropriately. The excessively worn contacts should be replaced. The surfaces of dynamic and static contacts should be clean, and the ablation place should be polished smoothly.

2. 1.5 control cabinet and excitation cabinet.

(1) Clean the dust on all parts. The circuit board can only be used? Hair dryer? When removing dust, brush and cotton yarn shall not be used for cleaning.

(2) Check whether the appearance of relays and contactors is normal, clean the contacts, and polish the ablation contacts when necessary.

(3) Check the arc-extinguishing cover to remove carbon deposit in the cover.

(4) check.

Whether the fusing value of each fuse meets the requirements, whether the terminal is loose or open, and whether the screws are tightened.

(5) Check whether each relay is running normally and whether the coil is hot during operation.

(6) Measure and record the data in the operation of the excitation system, make adjustments when necessary, and record the data after debugging.

2. 1.6 speed limiter.

(1) Clean all parts, lubricate all rotating moving parts, and observe whether they rotate flexibly and are sensitive to speed changes.

(2) Check whether the electric switch operates normally.

(3) Check the wheel grooves of the speed limit wheel and the tension wheel. Bearings and shafts are worn and replaced if necessary.

(4) Put down the rope clamp, test whether the speed limit rope is in the center of the jaw, and adjust it if necessary.

(5) Brake test: When the elevator reaches the last stop, put down the rope clamp, short-circuit the speed limiter action switch and slow down. From the time when the speed limiter is clamped to the time when the clamp moves, the braking distance shall meet the requirements in the following table (please click).

2. 1.7 tachogenerator.

(1) Clean all parts, and pay attention to commutator, carbon brush, belt and pulley groove. The length of carbon brush is not less than 5 mm ..

(2) check the position of each switch, whether the action is normal, whether the switch contacts melt and fall off, and whether the wiring is firm.

(3) Check whether the belt tension is normal, adjust it if necessary, and replace the toothed belt in time after toothed.

2. 1.8 rotary encoder.

Clean external dust and oil stains, and the appearance should be free from damage. Wiring and fixing bolts are firm and reliable.

2. 1.9 seismic sensor.

(1) Clean the external dust, and the appearance should be intact.

(2) The vibration test is normal.

(3) The wiring and fixing bolts are firm and reliable.

2.2 Regular maintenance items and contents of auto parts.

2.2. 1 door device.

(1) Remove dust and sludge from all parts, and add proper lubricating oil to guide rails and moving parts.

(2) When the door leaf falls off due to the abrasion of the hanging door roller, and the lower edge of the door is less than 4mm away from the sill, the installation height of the door roller should be adjusted or the roller should be replaced, and the gear position should be adjusted at the same time to ensure a reasonable gap (the gap between the domestic ladder gear and the lower edge of the guide rail is less than 0.5mm, and the Japanese ladder is less than 0.3mm).

(3) Check and adjust the door linkage. Properly tension ropes, chains and belts; The transmission joint of the transmission rod rotates flexibly, and the fixed parts should not be loose.

(4) Check whether the position of each switch is accurate, whether the fixation is firm, whether the actions such as contact plate are accurate and reliable, whether the wiring is reliable, and whether there is friction between the lead and each mobile unit. If there is friction, the position must be adjusted.

(5) When opening and closing the door, pay attention to the change of the speed of the door motor and adjust it if necessary. Pay attention to whether the door resistance wire is loose or virtual welding.

(6) Check and clean the door motor and refuel the bearing; Clean the commutator and carbon brush of DC motor. There is no abnormal sound and overheating in all parts during operation.

(7) Check whether the door foot slider and screw are fastened, and whether the slider is 6? 2mm, 0.5 ~ 1.5 mm from each side of the tank. If it exceeds this value, it should be adjusted or replaced.

(8) After the doors are closed, the gap between the doors should not be greater than 0.5 mm, and there should be no gap in the upper section.

2.2.2 Guide shoes.

(1) Check whether the fixing bolts of the guide shoes are fastened; The oil level of the oil cup of the slipper should be within 1/4 ~ 3/4 of the height of the oil cup, the oil quality is clean, the oil core is in good oil absorption condition, and the oil cup does not leak oil.

(2) The pressure of the elastic sliding guide shoe on the guide rail shall be ensured, and it shall be adjusted when the shoe lining is slack due to wear.

(3) Check the wear degree of the shoe lining of the sliding guide shoe (when the clearance between the shoe lining and the guide rail is zero on one side, the car shoe lining on the other side should be less than1mm; The other side of the counterweight sheath lining is 2mm. If it is greater than this data, replace the dust cover lining. The above shall be measured at the minimum distance between guide rails). Check whether the guide shoe has abnormal sound during operation.

(4) Check whether the roller of the rolling guide shoe is glued or broken, and there shall be no oil stain on the roller and guide rail; The roller should not be skewed to the working surface of the guide rail, but should be in uniform contact with the working surface of the guide rail over the entire rim width, and the movable part of the guide shoe bracket should be oiled.

(5) Check whether there is any abnormal sound on the rolling guide shoes during operation, and update or adjust them when necessary.

Pliers.

(1) Check whether all moving parts are loose.

(2) When the ladder stops, use the portable pull rod to check whether the wedge moves normally. After returning to normal, check that the gap between the wedge and the working face of the guide rail should be uniform on both sides, generally 3 ~ 4 mm ..

(3) The position of the clamp action switch is correct, and the wiring is not loose.

(4) Clean all wedges and bearings of movable parts and add oil.

2.2.4 Leveling device.

(1) Clean the dust and oil stains on the leveling device and the magnetic isolation plate, and tighten the screws at all parts.

(2) Stop the machine and check whether the contact connections are firm.

(3) The position of the magnet and the switch roller is relatively accurate, and a small amount of lubricating oil is added to the roller oil.

(4) Check whether the levelness of each floor meets the requirements: the levelness of AC two-speed elevator, with rated speed not greater than 0.25m/s and 0.5m/s? The rated speed of 5mm is not more than 0.75m/s and 1m/s? The flatness of 30mmAC/DC express elevator shall not exceed? 15mm AC speed regulation and DC high-speed elevator flatness is not greater than? Five millimeters.

2.2.5 All kinds of automobile bolts.

(1) Check and tighten the bolts of all parts of the car, including the bolts of the car wall, car bottom, fender, car frame, handrails and hangers.

(2) Add a little lubricating oil to each bolt.

2.3 Regular maintenance items and requirements of the shaft.

2.3. 1 hall door.

(1) Remove dust and oil stains from the door guide rail and all parts, and add proper lubricating oil to the guide rail and all moving parts.

(2) Check the tightness and wear of the door wire rope. Tension check of door wire rope: press the rope with a force of 10N (please click Figure 2 for the position of force application). When opening the door, the rope distance is 2D/3, and when closing the door, the rope distance is D/3, and D is the diameter of the wire rope.

(3) Whether the clearance and movement of all moving parts are normal.

(4) Clean the electrical contacts to make them contact well and work normally. After the lock hook is closed, the electric contact should keep enough pressure, about 50 ~ 75 kg.

(5) Check whether the door foot slider and screws are fastened, and whether the door foot slider is 6? 2mm, 0.5 ~ 1.5 mm from each side of the tank. If it exceeds this value, it should be adjusted or replaced.

(6) After the hall door is closed, the gap between the central door and the corresponding place shall not exceed 0.5mm, and there shall be no gap in the center of the upper section.

2.3.2 Retarder switch, limit switch, limit switch, etc.

(1) All switches and relays in the loop are working normally.

(2) Clean the dust of each switch. Each switch roller is flexible and the contacts are in good contact.

(3) The wiring of each switch is free from looseness and virtual welding.

(4) Each switch is fixed firmly, and the position of switch and iron block is relatively accurate. When the car sill crosses the upper sill by 50 ~ 100 mm (the daily ladder is 20 ~ 150 mm), the limit switch operates; Car sill exceeds terminal sill by 300? 50mm (Japanese ladder hydraulic buffer elevator is 250? 50mm, spring buffer elevator is 400? 50mm) limit switch should be action.

Counterweight device.

(1) Clean the counterweight device and check whether the screws in each part are loose.

(2) Whether the heavy blocks are pressed and whether the fixing screws of the heavy bottom iron blocks are tightened.

2.3.4 Guide rope, speed limit rope and balance rope.

(1) Check the wire rope for wear, breakage, deformation, rust, etc. During no-load operation, the speed of each line is1m. If any of the following conditions is found, replace the wire rope. ? Uniform fracture, one lay length fracture 4 or less; B) The cable diameter is reduced to less than 90% of the original cable diameter; C) When the broken wires are concentrated in one or two strands, there are less than four broken wires in one lay length in the most seriously damaged section; D) Due to severe corrosion, some steel wires in the steel strand are excessively worn, and two or less steel wires are broken in a lay length.

(2) Check whether the tightness of the guide rope is consistent, and generally measure it by hand or spring scale. What is the tension difference when measured with a spring scale? 5%。

(3) Check whether the rope head combination screw and cotter pin fall off.

(4) Check the contact between the rope and the pulley groove. When the wear depth of each groove is different by110 rope diameter, or the clearance between the traction rope and the groove bottom is less than 1mm, the rope sheave should be removed for repair or replacement.

(5) Check the length of traction rope, speed limit rope and balance rope. The elevator stops at the flat floor of the last station, and the counterweight reaches the upper end face of the oil pressure buffer 150mm, and the upper end face of the spring buffer is 200 ~ 350 mm If the size is below the lower limit, cut the rope.

After the length of the traction rope meets the requirements, measure the length of the balance rope, and the tensioning wheel frame of the balance rope device should be apart from the ground channel steel? 200mm, if below this value, the rope should be cut off. Under normal circumstances, the balance chain will not be extended. If it protrudes, check whether the fixing bolts at each connection interface and both ends are fastened.

Check whether the distance between the bottom of the speed limit rope tensioner and the ground of the pit meets the requirements and whether the iron arm is balanced. This distance requirement: domestic ladder and high-speed ladder 750? 50mm escalator 550 50mm slow escalator 400? 50mm Japanese ladder, 200? 50 mm. The rope should be cut below the above lower limit.

Guide rails and brackets.

(1) Check whether the bolts of the car and counterweight guide rail bracket are loose, and whether the welding and civil joints are loose.

(2) Clean the working face of each guide rail and add oil appropriately. Check whether the bolts of the guide rail connecting plate are loose and whether the guide rail is deformed.

2.3.6 Follow the line.

(1) Check whether there is any object touching the cable in the shaft, whether the cable sheath is cracked due to operation and whether the cable is twisted.

(2) When the elevator car stands at a low level, the cable should be 60 ~ 350 mm away from the bottom of the well, and when it is less than 60mm, the cable should be bound again.

2.3.7 Wiring posts for various conduits, trunking and junction boxes.

(1) Check whether the terminal connections of the automobile control panel, junction box and intermediate junction box are firm, including the power incoming line, motor connection and grounding line, and clean the junction box. Check whether the pile line of each line is rusted.

(2) Check the machine room, shaft, car top and car bottom for loose pipes and trunking, and check whether the grounding wire is firmly connected.

2.3.8 shaft cleaning.

(1) Clean up the garbage in all parts of the shaft, including the garbage on the door head cover, sill and counterweight frame.

(2) Remove obstacles that may collide with the car, counterweight and cable in the hoistway.

(3) Remove the garbage and sundries in the pit.

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