20/2/2017
My first time went outdoors for visiting the escalator at Kowloon Tong. I found that they need to check the inside of the escalators every day. They brought all the equipment using for maintenance, such as, toolbox, fence, etc. The first step, wear the safety feature, safety helmet and safety shoes. After visiting, I learnt the escalator is set as follows for the safety device. These facilities in order to prevent dangerous accidents will stop the operation of the escalator.
   
Drive chain safety device
If the drive chain is too long, the safety device will automatically stop the escalator.
Pedal chain safety device
When the chain of the rungs, pedals or conveyor belts is detected to be broken or overstretched, the device will stop the escalator.
SKIRT GUARD safety device
The safety device will automatically stop the escalator when there is a foreign matter between the skirt and the pedal.
The inlet guard of handrail safety device
At the entrance of the mobile armrest, there is a safety device for the protection of the handrail entrance. In case of hand and foreign body is caught, the safety device will automatically stop the escalator operation.
Emergency stop button
Use this button in an emergency situation to stop the escalator.
21/2/2017
Energy efficiency of lift & escalator Installation
è Set out the minimum design requirements on energy efficiency
è Designers are encouraged to adopt a proactive approach to exceed the minimum requirement.
Scope:
è Use for vertical transportation of motor vehicles, bed passengers lifts, escalators and passenger conveyors in all buildings.
a.) Builders lifts used for vertical transportation of persons in a building construction site.
b.) Hoists used for vertical transportation of material.
c.) Service lifts.
d.) Lifts and hoists installed in a performance stage.
e.) Lift equipment for building maintenance.
f.) Traction lift equipment with load > 5000kg and rated speed >3m/s.
Swiss Agency for Efficient Energy Use
Standby proportion total consumption
- Small apartments, 6 stop > 83%
- Office block 8 stops > 40%
- Large office block, hospital>25%
Minimum the energy cost of:
- Producing the lift component and the installed lift.
- Running the lift à direct energy consumption
- Repair and maintenance requirements
- End of lift removal and recycling.
Change the drive technology:
- Very few reason to use hydraulic drive
Good lifts where loading and unloading could cause big leveling deviations.
As above could cause loss of traction due to misuse.
- Gas accumulators, balance weights, closed loop control to improve energy efficiency.
Use most efficient technology:
MRL lifts lower construction materials use
- No machine room
- Fewer loads on building.
Permanent magnet synchronous motors
- High efficiency and energy density
- High Power factor under all load conditions
Roller guide shoes
Use most efficient technology:
- Lighter but strong materials
Traction drive lifts do not need to be counterbalanced around 50%
Use more efficient group control
- Double deck lifts
- Variable group size dependent on traffic conditions.
- Variable acceleration value and door operation dependent on traffic conditions.
- More than one, two lifts in a well.
Accident of lifts in Hong Kong
1993
Reason of accident:
1.) Overloading
2.) The site officer-in-charge did not make a periodic inspection for lift
Part: Temporary lift
Because of the dead of this accident is involved a minor as a part time job, thus, the government stipulated all the minor is not allow work in domain or it is a most for people who are held a green card.
2002:
Reason of accident:
As a result of a screw loose making the elevator keep climbing when the lift door is opened
A boy was not become aware of this situation, He dead when he entering the lift.
2008:
Reason of accident:
The counterweight pulley bearing of lifts is damaged, it makes eight of ropes to break away from the counter weight pulley under an unbalanced way, and lift becomes drop very quickly. The safety gear reduces the velocity but not allow stopping it. Seven of eight ropes breed happened. When the tension >66N, the seven ropes is snapped.
Industry stated that ‘In the recent years, many corporations choose non-original company as maintenance of lift for spent less money.
22/2/2017-23/2/2017
I finished a report about testing is the lifts achieve a standard for energy efficiency installations. The report needs point out all the details of lifts, such as, building name, load and speed, car internal size, also the door operation. I found that almost all types of door operation are ACVVVF and the landing doors used Center operation nowadays. Then, the report required the map picture aimed at knowing the nearby building and facilities of the situation. It also required AutoCAD drawing layout of Machine room, the side of it is neglected. I understand a government report had lots of step to prove its achievement. When elevator is built and your companies are joining the proposal of energy saving, they will text and make down the readings of all kinds of voltage and circuit. And check is it suitable for doing this kind of program. Then the companies should hand out this report on time. After finishing this report, I found that I can draw some easy AutoCAD drawing but use a long time.
23/2/2017
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) B3 hAppY!!
我就唱叮噹既我愛上的,