Application of Building Elevators

• Building elevator also known as freight lift, generally larger than the passenger lifts and loads more, ranging from 2000 to 5000 kg, most are based on traction. Freight lifts are generally not very good decoration, to avoid the shipment was damaged, many with manual control of the lift door switch.
  There is a very small freight elevator, in English called dumb waiter, specifically for multi-layer used to transport food, cups and plates in the restaurant. Such debris lifts will also be used to transport in multilayer library books.
  In places such as construction sites, warehouses will sometimes use rack and pinion mesh type elevators to transport goods and workers to use. The lift not lift shafts, use the rack support and move the car.
  
  
  A transport structure
  Traction type
  Multiple cables, hanging in the cabin lift shafts on the sheave room at the top. Steel cable suspension balance on the other end. General car plus 50% load is the weight. When the car moves, will move in opposite directions. Sheave is relying on the rough surface of the cables and friction between the grooves on the wheel to drive the car. So when the steel cable or sheave becomes old and must be replaced in due course to prevent skidding. Motor responsible for the driven sheave rotation, powered up or put down the car. Motor may be communication, there may be direct current. Partial motors using gears drive sheave, the newer and faster lifts typically using gearless drive. Some senior haulage type elevator weight compensation: under the car and counterweight is provided with a cable or chain, connect to ground. Role is to compensate for the flying car or counterweight cable length weight variation caused by change. Haulage type elevator will have a variety of safety devices to prevent the car due to cable breakage, for any reason, such as the degradation caused by brake failure. Minimum safety equipment including: installation of cables in the engine room the speed limiter, install safety gear in the car and counterweight. Safety gear is invented by Otis when the mechanical safety devices, automatically when accelerating to a speed clamp Rails, Park the car or counterweight brake. At the bottom of lift shafts, will be equipped with buffers, as the last protection.
  Traction lifts generally need to be set on top of the shaft machine room. Designed a new type of haulage type elevator, cable and Fibre-composite cable, can reduce the amount of lubrication and maintenance. In addition new motor small in size, can be installed in the leading axle or shaft, eliminating the room settings, called the elevator without machine room. Roomless lift is operated by Finland Kone elevators in 1996 research and development.
  Hydraulic
  Car supported by the bottom or side of the plunger up and down, piston driven by hydraulic pressure. Folding parts plunger can be used as a telescope, reducing the needed depth at the end of it. Parts plunger cannot be folded, subterranean installation must dig a hole. Because of restrictions on piston, hydraulic lift is generally only used in 2 to 5 storeys high building (not more than 20 metres). Advantages of hydraulic elevators is the engine room can be set in any position (can't leave the car too far, of course), and occupies less machinery is relatively easy; general use problems there is less chance of happening. But also have a large power, low speed faults, not higher than 1 meter per second, and emits heat when running. Therefore, computer room air conditioners must be used to cool down, otherwise the lift's lousy, even shut down due to overheating.
  Pneumatic
  Car in air-tight lift channel, differential pressure control, come to run the function. Commonly used for letters passing instruments, also in passenger lift designed to appear in the near future. This type of elevator lift saves cable and plunger, and have air-tight structure, syringe push a car, run to lift the top road and at the end. Car more streamlined structure, tunnels at the bottom does not need to be present.
  With currently available see pneumatic elevator. Have the following characteristics: lower emissions and take the weight directly affects elevator speed. Loading capacity will directly affect the intensity of the lifting gas-tight structure, like cable traction and hydraulic plunger usually carry a higher weight. Dray is different, if there's electricity in the operation, can be borrowed by gravity and natural intake fell to the bottom floor. Uplink using atmospheric pressure to improve car; down uses gravity to drop. Compressibility than oil and cables clear of air, took the elevator feel up and down in the past, in a pneumatic driven elevator are obvious.
  Elevator door lift door is two-tier. Within a layer of the gate is mounted on the car, commonly known as a car door. Switch machines installed on top of the car-driver car door, called the door. Outside a door is mounted on the lift shafts on each floor entrance, commonly known as the door (or door), which passed by the car door, close the door opener driven. Door springs (or hammer) is held in the closed state, prevent someone from falling into the hole. Interior doors with sensors (with reference to mechanical or light curtains-safety edge), sensors there are two kinds of mechanical and optical, prevents the extrusion to people or goods. Fold in the form of points and two doors from free pair folded, if specifically requested, or 30 percent.
  Early lifts the gate does not open automatically, car may only have spark. Exterior door it is possible is to manually pull open the door. In the new national standard GB7588, this category is called easy-lift, has been declining, is said not to do a (County).
  Not all lifts are horizontal (left/right) switches, there are vertical (up and down) design Folio, more common in old factory buildings inside a large freight elevator or multiple restaurants "dumb waiters".