Open Library - открытая библиотека учебной информации

Открытая библиотека для школьников и студентов. Лекции, конспекты и учебные материалы по всем научным направлениям.


Образование Chapter 4 Items for Maintenance and Repair
просмотров - 602

Period of maintenance and repair

The following regulations should be complied with during maintenance and


a) Only the inspection switch boxes should be used during test operations. At the same time, the inspection plugs should be put into the inspection outlets of the controller in either of driving and return stations. Pull the inspection plugs out after inspection.

b) Do not start an escalator with a load.

c) Before entering into an escalator for maintenance and repair, the emergency stop button on the inspection switch boxes or in either of driving and return stations should keep in operation.

d) Avoid the risk of getting an electric shock when repairing the system with the higher voltage than safety.

e) Record the abnormal phenomena.

3.4.1 Periodical maintenance and repair are vital to prevent an escalator to be damaged and to extend the length of its life.

3.4.2 The key factors determining the period of maintenance and repair as follows:

a) Running conditions (indoor, outdoor or outdoor with a roof)

b) Running time per week

c) Frequency of operations

3.4.3 Three types of maintenance and repair:

a) Daily: Include maintaining appearance, sanitation and lubrication of an escalator.

b) Light: include inspecting main function, basic cleaning work and lubrication.

c) Heavy: include inspecting all function, all equipments and doing some cleaning and lubrication work relevant to the running performance.

3.4.4 The too long period of maintenance and repair will influence an escalator to operate safely.

a) If the total running time is less than 80 hours per week, an escalator needs the maintenance and repair 4 times annually, including 2 light and 2 heavy.

b) If the total running time is up to 80 hours but less than 120 hours per week, an escalator needs the maintenance and repair 6 times annually, including 4 light and 2 heavy.

c) If the total running time is more than 120 hours per week, an escalator needs the maintenance and repair 8 times, including 4 light and 4 heavy.

3.4.5 First maintenance and repair.

If the total running time is more than 250 hours after a new escalator is put in operation, it

needs the first maintenance and repair. And the first maintenance and repair comprises: lubricating all chains completely, cleaning the machine room, fastening the bolts and adjusting the tension of handrails.

No. Sort Item Type of maintenance and repair Requirements
A B C  
Functional Inspection Balustrades   Safety and reliability
Safety notices   Safety notices for the users should be stuck to the glass of the access to escalator.
Three phase power switches   Reliability
Protection equipments against phase loss   Reliability
Key switches   Reliability
Emergency stopping button   Reliability
★Detecting passengers optical grating   Clean the lens of the detector to insure the reliability.
Failure and direction display   Display clearly and correctly
Inspection boxes   Reliability
Upper stop button   Reliability
Lower stop button   Reliability
Machine Room Controller     Clear and fasten all bolts
Motor tachogenerator   Reliability
Brake contact   Reliability
★Auxiliary brakes     Reliability
Stopping distances     The stopping distances for unloaded and downward moving loaded escalators shall be between 0.2-1m.
Stopping equipments     Reliability. Firstly, the braking belt should firmly stick to the surface of the brake wheel during stopping. Then when the brake is Releasing, the gap between the belt of the brake and the brake wheel should be less than 2mm. The belt should be replaced by a new one when the thickness of the belt is less than three-fourths of the original because of friction. The rising temperature of the brake motor should not exceed 105k.
Inner decking and Outer decking Outer decking Clean surface, firm and smooth splices
Inner decking Clean surface, firm and smooth splices
Skirt Panel Safety switches of skirt panel   Reliability
Skirt panel splices   Smooth splices
Skirt panel   Clean surface
Steps Step lightning   Clean and inspect
Guide rail   Inspect working conditions, clean and lubricate
Step chain roller   Inspect working conditions, clean and lubricate
Step bearing sleeves   Lubricate
Step chains No.68 or No.100 oil is used. The lubricating frequency and the amount of oil are determined according to running conditions.
Clearance between step chains and skirt panel   At each side: ≤4mm sum at both sides: ≤7mm
Horizontal guide rail     Inspect working conditions and screw the fastened bolt firmly.
Step nylon shield   Inspect the working condition, clean and lubricate
Steps   Its surface is not damaged and ribs on its tread surface is very clean.
Step chains safety switches   Reliability. And the switch clearance is 2mm wide.
Step entrances     Inspect working conditions of the steps position (both the horizontal part and the inclining part)
Step drive chain tension   Adjust the compression of the spring to synchronize the right of the steps with the left
Step sagging contact     A still escalator should not be started in case the contact is turned off.
Combs And Front Tread Comb teeth   If two continuous teeth are broken, the combs should be replaced.
Crossing-head screw     Rustproof: Release and lubricate all screws in the combs
mesh between the comb teeth and the steps. Pass freely without collision, the gap between the teeth and the grooves is 3-4mm
Pallets   Inspect if the pallets can move, and if its surface is clean and its teeth are aligned. Bend down the combs and adjust the compressing spring, then place a screw wrench between the steps and the pallets. And hand wind until the pallets can move backward.
Pallets side guide rail     Clean and lubricate
Pallets safety switch Reliability
Front tread Inspect if the edges are aligned and the surface is clean.
Handrail Coefficient Handrail It runs normally with a smooth and clean surface and a appropriate tension.
Handrail pulley group.   Inspect working conditions and clean.
Interior part of handrail     Inspect if the sliding surface is worn.
Handrail bearing roller     Inspect working conditions and clean the surface.
Handrail tension device   The handrail has an appropriate tension. And its pulley is in a good working condition.
Handrail entrance contact   A running escalator should be stopped at once in case of touching the contact.
Handrail fence(glass)   It is clean with a symmetric gap.
Tension of handrail drive chain   The handrail has an appropriate tension with a 10mm sag at its loose side.
Tension sheave     It has an appropriate tension. Make a stop test to the handrail with a hand force of 70kg.
Speed of the handrail     Not less than the speed of the steps.
Main Drive Chains Main drive chains   It has a good lubrication and an appropriate tension. The sag of the loose side of the handrail is 8mm.
Protection device for main drive chains   Work reliably and turn agilely. Its switch gap is 10mm.
Automatic Lubricating system ★Automatic lubricating system Reliability
★Oil level of the automatic lubricating system Inspect the oil level and fuel.
★Oil brush   Inspect its working conditions and its installing position ,then make some adjustment.
Others Cable   The cable is not worn and fixed firmly.
Motor   Water and oil should be prevented form entering the inside of the motor. The rising temperature of the motor should be less than 105k.Its temperature should not be more than 80℃ when the bearings on both sides are working normally. The motor is allowed to give off the slight noise as it is running, or we should stop and examine it.
Oil level of the gear box and Period of replacing oil   The lubricant should be clean and the rising temperature should not exceed 85k. The oil level should locate between the upper and lower limit of the oil level gauge. There is no oil leak. The lubricant should be replaced after 340 hours’ operation in the first-running escalator, and then be replaced per 680 hours. The lubricant type is No.460 industrial gear oil.
Sanitation of both machine rooms in an escalator.   Clean without oil waste or sundries.
Pit of an escalator   Without oil waste, sundries or water.
Appearance of an escalator Clean
NOTE: ① Types of maintenance and repair: A-Light (per month); B-Heavy (per six month indoor, per three month outdoor); C-Changeable period (according to the running time and working conditions.) ②The item marked “★” is optional according to contracts and the item marked “▲” is required. ③ The items, which are not in the list, should be maintained according to the practical working conditions.