Sliding door operator Heavy

- 19.31

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A sliding door operator (or sliding door opener or automatic sliding door operator) is a device that operates a sliding door for pedestrian use. It opens the door automatically, waits, then closes it.


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Uses

Sliding door operators are typically used on the outside doors of large retail businesses. (smaller retail businesses prefer swing door operators.) They are also used in elevators (lifts)


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Triggering

A door operator may be triggered in various ways:

  • Approach Sensor (such as a radar sensor) - the door opens when a user approaches it.
  • Pushbutton - the door opens when a user presses a button.
  • Access control - the door opens when an Access Control System determines the user is authorized to go through.
  • Automatically (in the case of elevators)

A trigger from any of the above requests that the door be opened (or reopened if it was closing).


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Safety sensors

A sliding door operator reopens the door if it closes into an obstacle. However, most operators use sensors to prevent the door from ever coming into contact with a user in the first place.

The simplest sensor is a light beam across the opening. An obstacle in the path of the closing door breaks the beam, indicating its presence. Infrared and radar safety sensors are also commonly used.


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Collision Detection

In the instance that an object is not detected by a safety beam or curtain, the BLDC motor can detect the resistance of the door pushing on the object. If such resistance is found, the door opens back up.


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Technology

The operator is placed in the space above the sliding door.

An electric motor, geared down to get a lower speed and a higher torque, drives a pulley at one end of a belt. The door is clamped to the belt. To open the door, the motor turns the pulley, which in turn turns the belt, which in turn drags the door. To close the door, the reverse occurs.

Historically, elevator doors were opened by a set of mechanical linkages; the motor, geared down, would rotate linked arms, which in turn would drive the door.


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Types

There are several types of sliding doors, these are:

  • Standard sliding door (single wing or double wings)
  • Telescopic sliding door (two wings or four wings)
  • Circular sliding door (segment circular, semi-circular or full circular)
  • Sliding folding door (two wings or four wings)
  • Hermetic sliding door (single wing or double wings)
  • All glass sliding door (single wing or double wings)
  • Clean room sliding door (single wing or double wings)

Source of the article : Wikipedia



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