Machine-room-less elevators are opposite to m […]
Machine-room-less elevators are opposite to machine-room elevators. In other words, modern technology (technology) is used to miniaturize the equipment room while maintaining the original performance and eliminating the computer room. The control cabinet, tractor, speed limiter, etc. of the original machine room are moved to the hoistway or side of the hoistway on the top of the elevator, thus eliminating the traditional machine room.
One, the advantages of machine room elevators and machine room elevators (advantages)
1. The advantage of the computer room is to save space, you can only build a maintenance platform under the host.
2. Since there is no need for a computer room, it has greater benefits to the structure and cost of the building. This allows architects to have greater flexibility and convenience in design, provides designers with greater freedom, and at the same time eliminates the construction cost of machine room elevators for car owners. Lower. 3. Due to the particularity of the overall design of some ancient buildings and the roof (roof) requirements, the elevator problem must be solved within the effective height. Therefore, the machine roomless elevator is very suitable for this kind of construction needs, and in places with scenic spots, because the machine room is on the upper floor, deliberate destruction is the local ethnic heterogeneity. If a machine room-less elevator is used, the height of the building can be effectively reduced because there is no need to set the main room of the elevator separately. 4. It is inconvenient to set up elevator rooms, such as hotels, hotel annexes, platforms, etc.
Second, the place where the machine room elevator is not good compared to the machine room elevator
1. Noise, vibration and the use of local machine room-less host placement are now two popular types: one is used for placing the host on the roof of the car and connecting it through the guide wheel inside the hoistway. No matter which of the above, the noise impact is very large because the steel connection ( Steel), the noise must be digested in the shaft, plus the brake sound, the sound of the fan will be amplified. Therefore, in terms of noise, the machine room is significantly larger than the machine room. In addition, the rigid connection and resonance phenomenon of the main engine is inevitably transmitted to the car and track (TTW guide rail), and the influence on the car and guide rail is relatively large. Therefore, the comfort of the computer room is significantly weaker than the comfort of the computer room. Due to the impact of these two projects, the machine room-less elevator is not suitable for high-speed trapezoids above 1.75/s. In addition, due to the limited support of the hoistway wall, the load-bearing capacity of the machine-roomless elevator generally does not exceed 1150 kg. The excessive load-bearing capacity of the hoistway wall is too high, and the thickness of the reinforced concrete is usually 200mm. The brick-concrete structure is usually 240mm, which is not suitable for carrying too large. Therefore, the ladder-shaped machine room of 1.75m/S and 1150 kg can replace the machine room, and the large-capacity high-speed elevator, the machine room elevator is obviously better than the machine room elevator. Household elevators also have a stepped type, and the pedals are continuously operated on the crawlers, usually called escalators or moving walks. Suitable for fixed lifting equipment on designated floors. The vertical elevator has a car that extends between at least two rows of rigid rails that are vertical or have an inclination angle of less than 15°. Car elevator steering system: The main function of the guidance system is to limit the freedom of movement of the car and the counterweight, so that the car and the counterweight can only move up and down along the guide rail. The guide system is mainly composed of guide rail, guide shoe and guide rail frame.
2. The temperature affects the heat of the elevator relatively large, and its various electronic components can withstand higher high temperature resistance (capability). Now the elevator with machine room and elevator without machine room adopt permanent magnet synchronous gear traction machine, and its permanent magnet The temperature of the synchronous motor should not be too high, otherwise it will cause "loss of magnetization". Therefore, the temperature and exhaust volume of the computer room are clearly specified in the national standards. The main heating components, such as the engine room host, are in the hoistway. Because there is no corresponding cooling and exhaust facilities, the temperature of the machine room-less elevator has a greater impact on the host and control cabinet, especially the overall transparent viewing elevator is not suitable for installing machine room elevators, and the hot air accumulated in the elevator cannot be discharged. Therefore, the choice of this elevator must be heavy.
3. The maintenance and management of the machine room elevator for fault repair and personnel rescue is not as convenient as the machine room elevator. It is more troublesome to repair and debug a machine room-less elevator, because even the best elevator will inevitably fail, and the machine room-less elevator is installed on the beam and the main engine is in the hoistway. If it is the main engine, it is very troublesome. Therefore, the national standard clearly stipulates that there is no need to increase the elevator window of the machine room, and the machine room must be added for storage and maintenance, and to maintain the convenience and safety of the host. In terms of maintenance, elevators with machine rooms have absolute advantages. If there is space, it is recommended to use the machine room. With the international community paying attention to environmental protection through elevators, all major elevator companies basically apply powder coatings on the elevator surface. This is a new type of environmentally friendly solvent-free paint, with various properties better than paint.
In addition, in terms of personnel rescue, the machine roomless elevator is also very troublesome. If there is a power failure, an emergency power supply must be installed. Usually, elevator emergency power supply requires more investment. The machine room elevator can be manually opened in the machine room. After the car is driven to the leveling area, most machine rooms are equipped with battery release or manual cable release, but this equipment can only be used to release the brake, which depends on the car and currency pair. The weight difference causes the car to rise or fall. When the car’s personnel plus the weight of the car’s own weight and the weight of the counterweight are very different, not only the brakes are released but also the balance is artificially damaged, usually the maintenance personnel enter the previous one. The layered door enters the roof to increase the weight and move the elevator to a horizontal position. Therefore, there is a certain handling risk and must be handled by professionals. Through the above comparative analysis, the machine-room elevator and the machine-room elevator have the same use and the same safety performance, but their advantages and disadvantages are different. The owner can choose a machine room-less elevator or a machine room according to actual needs.