The reporter learned from the Shanghai Municipal Bureau of Quality and Technical Supervision yesterday that in the past two years, the city's quality and technical supervision system has accepted 1,752 complaints concerning special equipment business, of which elevator complaints have been reported from 1,513, and accounted for 86.4% of complaints received by special equipment business. The problems reflected are concentrated in the elevators, rolling cars, running noise, and elevator outages.
According to reports, the total number of elevators in the city has now reached 133,384, and the number of elevators accounts for 7.9% of the total number of elevators in the country, which has exceeded New York. The "ageing" phenomenon of elevator equipment has become increasingly evident. Among them, there are 32,577 elevators with a service life of more than 10 years, accounting for 23.9%; 23,149 with a service life of more than 12 years, accounting for 17%; and 13,434 with a service life of more than 15 years, accounting for 9.9%. This city elevator has entered the high failure period of the product design life cycle. High failure rate and poor comfort will be long-term problems.
This year, the city will use Dongcheng District as a pilot to implement the elevator IoT technology. About 2,000 elevators in important places and key units in Dongcheng District use sensors or data collection terminals to monitor elevator running status in real time. The demonstration project will build an elevator front-end acquisition system and upload data and video information to the municipal elevator operation safety monitoring platform through the network. After a fault or accident occurs in an elevator, it will be reported to the network or mobile phone at the first time. The maintenance unit and user unit will eliminate the failure within 30 minutes; if it has not been resolved for more than 30 minutes, it will be uploaded to the district-level platform; it will not be resolved within 2 hours. , will start the municipal platform.
The total investment of the project is 25.9 million yuan. The equipment will be commissioned in July this year and will be completed by the end of the year.
It is reported that the elevator IOT technical standards involve the preparation of three types of 13 standards, and nine draft standards have been completed. In the future, pilot projects will be conducted in Zhongguancun and Xicheng Financial Street in Haidian.
There are raceways on the inner and outer rings of angular contact ball bearings, and the inner and outer rings can be displaced relative along the axial direction of the bearing. These bearings are particularly suitable for combined loads, i.e. loads that act in both the radial and axial directions. The axial load bearing capacity of angular contact ball bearings increases with the increase of contact angle α. The contact angle is the angle between the contact point connection between the ball and the raceway in the radial plane and the perpendicular line of the bearing axis.
The types of angular contact ball bearings are divided into: α=15° angular contact ball bearings (70000C type); α=25° angular contact ball bearings (70000AC type); α=40° angular contact ball bearings (70000B type); Back-to-back paired double angular contact ball bearings [70000C(AC, B)/DB type]; Face-to-face paired double angle contact ball bearings [70000C(AC, B)/DF type]; Tandem Paired Double Angular Contact Ball Bearings [70000C (AC, B)/DT Type]; Double row angular contact ball bearings with ball notch (00000 type); Double row angular contact ball bearings without ball notch (type 00000A); Double row angular contact ball bearing without ball notch, one side with dust cap (00000A-Z type); Double row angular contact ball bearings without ball notch, with dust caps on both sides (00000A-2Z type); Double row angular contact ball bearing with sealing ring on one side without ball notching (00000ARS type); Double row angular contact ball bearings with sealing rings on both sides without ball notching (00000A-2RS type); Four-point angular contact ball bearings (QJ0000 type), a total of 13 types
Angular Contact Ball Bearings,Contact Angle Ball Bearing,Angular Ball Bearing,Angle Contact Ball Bearing
Hebei Fangqiang bearing manufacturing Co., LTD , https://www.fangqiangbearing.com