Månadsvis arkiv: februari 2020

The fulcrum should be constructed as a fixed fulcrum

Before installation or disassembly, the competent department shall formulate a detailed operation plan in accordance with the requirements of the manual in accordance with the actual conditions of the construction site, and provide technical briefing and designation of guardians to all staff home escalator manufacturers before the work of the team. According to the regulations of the Ministry of Construction, the installation and dismantling staff shall be staffed by professional teams and those who have obtained the qualification certificates issued by the relevant municipal departments, and shall have special personnel to direct them.1. The horizontal displacement control value of the column top of the elevator shaft structure should not be greater than H / 500 (H is the height from the top of the foundation to the top of the column).

When arranged in an adhering manner, a steel structure should be used. The fulcrum should be constructed as a fixed fulcrum. 6. The structure of the elevator shaft should adopt the external attachment arrangement, and it can also adopt the independent arrangement and the internal attachment arrangement. 3. For an independently arranged elevator shaft structure, the wind vibration coefficient should be considered when calculating the wind load. When the elevator shaft structure is arranged independently, reinforced concrete structure can be adopted. 2

Therefore, in the design, we usually treat it as the front room of the fire elevator room, and do not protect the rest.’ Can fire hydrants located in the front room protect adjacent areas? The provisions of the ’High Regulations’ did not specify this, but the ’Fire Elevator Front Chamber shall be equipped with an indoor fire hydrant’ in the ’Building Design Fire Protection Code’ clearly states that the fire hydrant in the front of the fire elevator is for the convenience of firefighters The use of fire hydrants and the opening of channels cannot be included in the total number of fire hydrants..

At present, in some places such as Shanghai, fire protection design regulations require hat fire hydrants be installed in the front rooms of smoke-resistant stairwells in high-rise buildings.The ’High Regulations’ stipulates that ’fire hydrants must be provided in the front room of high-rise building fire elevator rooms

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The development of elevator control methods has gone

In 1967, thyristors were used to drive elevators, and elevators controlled by AC voltage and speed drives appeared. In 1983, elevators with variable voltage and frequency control appeared, and quickly became mainstream products for elevators due to their good speed regulation performance, comfort, and energy saving.

In 1996, the machine-room-less elevator driven by AC permanent magnet synchronous gearless traction machine appeared, and the elevator technology was another innovation. Because the traction machine and the control cabinet are placed in the hoistway, the independent machine room is omitted, the construction cost is saved, the effective area of ​​the building is increased, and the freedom of design of the building’s architectural aesthetics is improved. This elevator also has the characteristics of energy saving, no oil pollution, maintenance-free and high safety.

The development of elevator control methods has gone through processes such as handle switch operation, button control, signal control, and collective selection control. Parallel control and intelligent group control have appeared for multiple elevators.
Nowadays, elevator companies from all over the world are constantly researching and developing new elevator products and improving their maintenance and service systems, and strive to meet people’s increasing demand for modern construction and transportation.

In 1852, the home escalator suppliers engineer Elisha Graves Otis (1811 ~ 1861) invented the world’s first safety lift in Yonkers, New York, USA. It is a lift powered by a steam engine and equipped with safety devices. He fixed the jagged iron bar on the guide rail, set a spring leaf on the upper part of the car, and connected it with the mechanical linkage and the brake pawl. The traction rope is fixed in the center of the spring piece. When the traction rope breaks, the spring piece returns to its original shape, forcing the mechanical linkage to move, and then the brake claws extend into the jagged iron bar to prevent the elevator from falling. Industrial users (cargo lifts) are the first users of safety lifts.

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