Friction wheel 6.Step 7.Step chain 8.Handrail

Controller 2.Motor 3.Main shaft 4.Parts of holding belt

General

Chapter 1 Introduction

An escalator is consisted of two belt conveyors and a chain conveyor. The belt conveyor is designed to drive the handrail system, at the same time the chain conveyors are designed to drive the steps. DIAO SME series of escalators are the newest products of our company, which comply with National Standard GB16899-1997 “Safety rules for the construction and installation of escalators and passenger conveyors”. Not only the escalators have compact structures and beautiful outlines, but also they run smoothly with low noise and can be maintained easily. They are widely used on a lot of locations such as department stores, hotels, office buildings and etc.

1.2 DIAO SME Main Parameters:

Model	SME
Nominal width of step (B)	1000mm	800mm	600mm
Capacity (Q)	9000persons/h	6750persons/h	4500persons/h
Rise of an escalator(H)	≤6m
Angle of inclination(α)	30° 35°
Nominal speed (V)	0.5m/s

1.3 DIAO SME Main parts:

Lower Structure of Escalator

Upper Structure of Escalator

1.3.1 Driving system

The driving system of escalator, which is consisted of a motor, a reducer and an operational brake, is located at the driving station. The reducer is a nice worm gear reducer adopting the special Niman teeth and the advanced manufacturing techniques, which has the advantage of the compact structure, a heavy carrying capacity, calm operation, low noise and etc. A flexible coupling connects the motor shaft with the reducer, which would benefit assembly and maintenance. The motor capacity is designed according to the rise of the escalator and the step width.

1.3.2 Truss

The truss of DIAO SME escalator is half closed metal supporting structure, which supports both the escalator’s and the passengers’ weight. Both its ends contacting the ground are standing on the supporting beam of the building. In order to reduce the vibration of the escalator, a special damping rubber is located between the building and the supporting points of the truss. The deflection of the whole truss does not exceed 1/1000 of the horizontal distance between the supporting points.

1.3.3 Guide rail system

The guide rail system of DIAO SME escalator is composed of high strength guide rail profiled bars, guide rail supporting parts, turning wall and other components. The guide rail system is installed in the truss.

1.3.4 Steps

Steps used in DIAO SME escalator are made of stainless steel. They have the advantage of lightness and accuracy. There are a lot of grooves in their pallets and risers. When the steps are moving, the grooves of the pallets engage with the comb teeth, which can prevent foreign bodies from dropping into the escalator. There are yellow safety lines on each side of the steps and damping mud inside the steps. Step auxiliary wheels and guide blocks are installed on the steps.

1.3.5 Step chains

The step chains are composed of two pairs of chains especially for escalators with a pitch line of 133.3mm.The mail wheel hub is made of polyurethane and the rim is consisted of a double faces sealed ball bearing, which can reduce the noise made by the mesh between chains and wheels.

1.3.6 Skirt panel

Skirt panels used by DIAO SME series of escalators are located on each side of the steps, which surfaces are smooth. The clearance between skirts panels and steps shall not exceed 4mm at each side, and 7mm for the sum of clearance measured at both sides at two directly opposite points. The skirt panels separate the carrying parts from the driving parts of the system, which can prevent accidents from happening.

1.3.7 Balustrade

The balustrade is an important part to insure the passengers’ safety. The interior paneling of DIAO SME escalator is made of tempered glass with a thickness of 10mm and fastened in the stainless steel balustrade. It has a compact structure and a beautiful outline.

1.3.8 Combs

The combs are located at both landings of escalator. They are covered with textured panels made of stainless steel to prevent sliding. The combs are fastened on the front part of the combs with bolts. They engage with the step’s parallel teeth grooves. In case of the teeth being trapped by foreign bodies, the combs move backward to touch the safety switch and the escalator stop to insure passengers’ safety.

1.3.9 Front tread

The front treads are installed on the top of each machine room of an escalator, which is the transition from the steps to the ground. They are covered with textured panels made of stainless steel to prevent sliding. The front treads can be opened when it is necessary to clean or maintain the escalator daily.

1.3.10 Handrail

The handrail is made of high quality rubber and is completely close without any joint on the surface. Its outer layer is woven by fiber and steel wire and covered with nice rubber. The handrail is installed on the balustrade. It runs faster 0 to 2% than the steps in order that the passengers can hold the handrail.

1.3.11 Inner decking and outer decking

The inner decking is installed between the skirt panel and the balustrade interior, and the outer decking between the skirt panel and the exterior paneling. They are made of striped stainless steel cover plates and easy to be disassembled.

1.3.12 Electric control

The electric control adopts PLC control method in DIAO SME escalator, which is consisted of two control boxes. One is a power box that is fitted in the driving station, and the other is a PLC control box that is fitted in the return station. Considering safety and convenience of maintenances, there are an inspection socket and an emergency stopping button on both control boxes. The control box can be taken out when the front tread is open.

1.4 Safety protection:

1.4.1 Protection devices for ruptured or extended step chains

The protection devices are fitted on the return station. In the case of rupture or extension of any piece of traction chain, the safety devices take effect. The power is cut and the steps stop at the same time. And the corresponding failure number is also displayed.

1.4.2 Safety protection device for sagging steps

In case the steps are sagging, the steps pallet or the steps shaft touch a stick, and then the stick turns on the switch to cut the machine power and the steps stop. At the same time, the corresponding failure number is also displayed.

1.4.3 Safety switch for clearance between steps and skirt panel

There are two safety switches on each horizontal part of an escalator respectively. The skirt panel panel is deformed because of extrusion when it collides with steps or when foreign bodies are trapped in the clearance between steps and skirt panel. And this make the safety switches take effect. The machine power is cut and the steps stop. At the same time, the corresponding failure number is also displayed.

1.4.4 Safety protection device for combs

There are two safety switches behind each combs respectively, one is on the right and another on the left. The combs move backward when a single push force of 750N is exerted on the combs, which makes the safety switches take effect. Then the machine power is cut and the steps stop. At the same time, the corresponding failure number is also displayed.

1.4.5 Protection device for fingers

There are safety protection devices at each of the four entrances. In the case of foreign bodies or passengers’ fingers trapped at the entrances, the safety devices take effect. The machine power is cut and the steps stop. At the same time, the corresponding failure number is also displayed.

1.4.6 Protection device for driving chain

In case of rupture or extension of the driving chain, the safety devices take effect. The machine power is cut and the steps stop. At the same time, the number is also displayed corresponding to this failure.

1.4.7 Monitoring for the speed of escalator.

An electronic tachogenerator is fitted under the output chain wheel of the drive machine. If the speed inspected by the equipment is under 80% or over 110% of the rated speed, the controller sends a signal to stop the machine.

1.4.8 Step lighting

A green lighting bulb is fitted under each horizontal part of steps of an escalator, and then passengers are able to see the edge of steps clearly. It can prevent a danger.

1.4.9 Failure display

Considering the convenience of maintenance,DIAO SME series of escalators are equipped with a failure display, which is fitted on the down part of the controller or on the skirt panel. In case any malfunction of the escalator occurs, the inspector can consult the failure code table according to the information supplied by the display and confirm what is wrong with the escalator. You can get the details about the failure code table from “Electric Maintenance Instruction.”

1.4.10 Lubricating device

The device ensures lubricating driving chains and step chains of escalator. You can choose automatic or manual way to lubricate.

Дата добавления: 2014-12-23