Elevator production status abroad

Elevator production status abroad

Nowadays the world elevator production is developing rapidly and the competition is fierce. The world's major elevator manufacturers are multinational companies. Among them, the American Otis elevator company and the Swiss schindler elevator company have the longest history. They all have a history of more than 100 years of elevator production, regardless of the output, varieties, technology and economic strength of the elevator can be rated as first-class. The elevator industry in Japan has improved rapidly, especially since mitsubishi electric corporation of Japan launched the new ac speed control system of variable frequency and variable pressure speed regulation. Driven by this, the major elevator manufacturers have launched a fierce competition in this field of technology.

In today's rapid development of electronic technology, high-performance electronic components appear constantly, and the price is constantly falling. Microcomputer control is widely used in the elevator control system, which greatly improves the performance and reliability of the elevator. At present, the improvement of world elevator technology is mainly reflected in the following aspects:

(1) microcomputer is increasingly widely used in elevator control system, thus replacing the traditional numerous relay contact control system, greatly reducing the size of control cabinet and reducing the floor area of machine room, which is especially significant in high-rise elevators. In addition to the safety protection circuit specified in the elevator safety code must be composed of contact electrical components, most of the control circuits are microelectronic solid state circuits. It improves the operation performance and efficiency of the elevator, reduces the waiting time of passengers, and makes the elevator more convenient and faster to use.

(2) the ac speed regulating elevator with ac induction motor has been widely used, and replaced the high-energy dc generator, the electric motor driven elevator, on a large scale. The technology has become increasingly mature since mitsubishi corporation of Japan launched the variable frequency variable pressure speed regulating system in the early 1980s. This kind of driving technology can reduce the power capacity of the building where the elevator is located, reduce the load in the machine room, save energy consumption and operate reliably. In addition, Otis has also developed an ac high-speed elevator with an ac frequency control and speed drive.

In dc drive technology, the dc drive elevator powered by SCR has been further improved and developed. This control technology will reduce machine room area, power consumption and noise. At present, there is a strong vitality in the high-speed elevator drag.

(3) in order to simplify the driving control system of the elevator and improve its operation performance; The main elevator manufacturers in the world, this is specially designed and manufactured for the lift drag characteristics of ac induction motor and the low speed of dc motor, so as to adapt to the elevator Ⅳ quadrant running work condition of needs; In particular, there are special requirements for the mechanical characteristics of the motor, starting torque, starting times per unit time and so on. At present, permanent magnet synchronous motor develops most rapidly.

(4) the structural performance of the tractor is constantly improved. The volume of the tractor is gradually reduced. The efficiency of worm gear reduction drive is greatly improved. At the same time, more compact volume, larger reduction ratio range, more efficient transmission of planetary gear reducer is gradually applied to elevator traction machine. The performance of the tractor is also improving. The application of high efficiency disc brake enables the multi-point independent braking of the elevator traction machine, greatly increases the safety reliability of the brake mechanism, and also makes the brake have the functions of wear monitoring and fault alarm control.

(5) the technical progress of permanent magnet materials enables permanent magnet synchronous motor to achieve rapid development. The traditional elevator technical specification is challenged by this technology. With the advantages of environmental protection, energy saving and small space, the machine-room elevator is developing rapidly. Energy-saving, pollution-free and efficient elevator products are developing with the concept of green environmental protection in the new century.

(6) the diversification of modern architectural forms requires greater applicability of elevator structure. The need for vertical transport in different structures in different environments. Elevator manufacturers are making continuous improvements to the elevator structural components. If the height of cage is reduced to adapt to the building structure with lower space and lower top floor; The design flexibility of the top structure of the building is improved by the structure design without computer room. Reduce the height of the hydraulic buffer to reduce the depth of the pit; Strengthen the protection of car, traction rope and bottom pit parts to meet the requirements of outdoor work.

(7) in the aspects of elevator car structure and decoration, double and multi-storey passenger elevators and various types of sightseeing elevators have been developed. Elevator car interior and exterior decoration is increasingly diversified. It also promotes the adoption of non-metallic materials such as glass in the revision of the safety specification of the elevator, so as to make the car structure more luxurious. Make riding an elevator a comfortable sport trip.