Chapter 12 Escalator Installation PDF

Chapter 12 Escalator Installation hcs/Rev Jun04 1  Learning Outcomes Understand the various major components in escalator installation. Understand the functions of the major components. Understand the safety functions in escalator installation. Testi...

Chapter 12 Escalator Installation hcs/Rev Jun04 1  Learning Outcomes Understand the various major components in escalator installation. Understand the functions of the major components. Understand the safety functions in escalator installation. Testing & Commissioning of escalator installation. hcs/Rev Jun04 2  How Escalator Work hcs/Rev Jun04 3  Operation of escalator http://science.howstuffworks.com/escalator1.htm GEAR REDUCER 4 hcs/Rev Jun04 5  Main Drive hcs/Rev Jun04 6  Drive Chains The Main Drive Chains are roller chains, which are driving the main drive sprockets form the gear reducer. The Main Drive Sprockets, in turn, drive the other 2 chains i.e. the step and handrail chains. hcs/Rev Jun04 7  Steps There are 4 wheels per step - 2 front driving wheels and 2 followers. The wheels are made of grease packed bearing with rubber or nylon tyres shrunk on them. hcs/Rev Jun04 8  Step Chains & Handrail Chains The step chains are connected only to the front driving wheels of the escalator steps, which travel on the step tracks. The handrail chain drives the handrail through a set of drive rollers (also known as friction sheaves) hcs/Rev Jun04 9  Steps Steps design is rather standard for all escalator manufacturers. Material used is normally die-cast aluminium or stainless steel. hcs/Rev Jun04 10  Balustrade a) Solid type with Formica or laminated panel. b) Translucent type with acrylic materials c) Translucent type with tempered glass d) Combination of (b) and (c). hcs/Rev Jun04 11  Balustrade Some transparent balustrades gave vertical mullions at regular intervals but most modern escalators are manufactured with self-supported glass panels. Lighting under the handrails can be provided for the translucent and transparent types. hcs/Rev Jun04 12  Comb & Complate hcs/Rev Jun04 13  Comb & Combplate These are either made of plastic moulded material or cast aluminium. The comb teeth must be brittle so that they will break when obstruction occurs in the step groove. The comb teeth must be accurately aligned with the tread board of the steps. This is to eliminate wear and tear on the step tread or comb teeth. hcs/Rev Jun04 14  Handrails hcs/Rev Jun04 15  Handrails The moving handrail provides support for the passengers to maintain their balance when traveling on an escalator. They are driven at or near the step speed. Made of synthetic or natural rubber. E.g. synthetic rubber with reinforcement in steel tape, steel wire or fibre wool. The general life span of handrail is more than 5 years. hcs/Rev Jun04 16  Emergency Stop Switches or Buttons A Red or Yellow push button. Typically provided at top & bottom landings for emergency stopping. hcs/Rev Jun04 17  Broken Step Chain Safety Device Fitted at the bottom landing of the escalator at the truss frame Controlled by a spring tensioning device; actuated to stop the motor and the step train when the step chains sags or breaks. hcs/Rev Jun04 18  Broken Drive Chain Safety Device Fitted at the upper truss part Actuated to stop the motor when the drive chain is broken. hcs/Rev Jun04 19 Skirt - Additional Safety Device Skirt Step 20  Handrail Cut-off Safety Device Installed at the inclined side of the escalator behind the skirt guard, this safety device will activated to stop the escalator when the handrail stretches or sags beyond pre-set limits and/or when it suddenly snaps. One each is provided for each handrail. hcs/Rev Jun04 21  Handrail Guard Safety Switches Provided at the handrail returns at the upper and lower landings. The purpose is to stop the escalator when any foreign object such as children’s fingers are drawn into the handrail. hcs/Rev Jun04 22  Drive Chain and Step Chain http://www.youtube.com/watch?v=ffLOmrqaUT0 Motor hcs/Rev Jun04 23  Apex Guard hcs/Rev Jun04 24  Escalators No Waiting Speed Components time Can be reversed Riding time = Truss Used when 45 s Main Drive stationary Speed 0.5 m/s Step chain commonly Handrail chain CP:15 used Steps 30 deg type Vertical rise is Balustrades 35 deg type 11 m Combs and Comb Not > 40 deg plate > 11 m, higher Handrail Can be > 40 if speed ok, but controller