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An important issue to consider in modernization is safety, especially for elevators with underground hydraulic cylinders. It is well known that these cylinders will rust and lose hydraulic pressure, causing the cab to fall freely. Escalator Company are modernizing elevators. Now, the code requires all underground hydraulic lift cylinders to have a PVC lining to prevent corrosion. Whether the elevator has been modified with a safety device, if the hydraulic pressure is lost, the cab will not drop, which is correct.
The counterweight reduces the amount of braking the elevator needs to use. Imagine if there is no counterweight: a heavy lift truck is really hard to stop, but if there is no strong brake to stop it, it tends to play on its own. The counterweight makes the elevator car easier to control.
The new hydraulic system that has just entered the market without an underground cylinder is the "rope hydraulic system". Without an underground cylinder, the elevator is like a traction elevator with the necessary built-in safety features. It is more expensive than a conventional hydraulic system, but it is not as expensive to install as a traction elevator.
An effective operation strategy of an elevator system in an office building is proposed. This method is suitable for a specific 11 floors, of which there are 4 elevator shafts. A queuing model in which the time characteristics of passenger arrival and destination are time variables is established.
Separate outdoor doors and doors are an important part of modern elevator systems. These two methods usually use the same operation, such as central opening, double leaf, single sliding. The door is opened and closed by an electric motor on the car. The door speed is adjusted when closed to avoid injury to the person being shut down. If the door hits an object when it is closed, the sensor electrically reverses the door. Photoelectric control and electronic proximity devices are also used to control the reversal of the door.
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