Abstract: As a common equipment in life, the importance of elevators in safety performance and fault warning is self-evident. The causes of elevator failure and safety problems are very complex, and how to prevent them efficiently has become an urgent problem to be solved. This article will show how wireless communication can make a big difference in maintaining elevator safety.
For most residents living in high-rise buildings, the elevator is “the first step to go out and the last way to go home”. Although the accident rate of elevators causing casualties is extremely low, elevators, as one of the special equipments that people have a lot of daily contact with, are frequently used and pay more attention to, once a safety accident occurs, it will have a serious impact on social life.
Figure 1 Daily use of elevators
The reasons for elevator safety failures can be summed up in the following aspects: first, external reasons, such as power outages during elevator operation, and excessive temperature in the machine room; second, human reasons, such as elevator damage caused by decoration garbage, and elevator door deformation caused by barbaric handling , overload operation, etc.; the third is system reasons, such as elevator door lock failure, door machine failure, etc.
According to statistics from the China Elevator Industry Association, among the factors that cause elevator safety hazards, manufacturing quality accounts for 16%, installation accounts for 24%, and maintenance and use problems are as high as 60%. Frequent inspection and maintenance are the basic conditions for an elevator to be used for a long time, while less maintenance and maintenance are the main culprits of accidents.
Although the elevator maintenance unit will maintain the elevator on a regular basis, if the elevator fails, the rescue will be delayed and secondary damage will occur, and because the passengers do not describe the fault in place, it will affect the effective repair of the fault. How to effectively solve these kinds of failures and maintain the safety of users in efficient and low-cost elevators, wireless communication will shine in this regard.
The wireless elevator fault early warning system is mainly composed of three parts: sensor terminal acquisition node, wireless transmission gateway and remote monitoring center. The overall block diagram of the system is as follows:
Figure 2 System block diagram
The sensor terminal collection node is mainly composed of sensor nodes distributed in the elevator car and on the car top, which are responsible for monitoring the elevator operation parameters, and send the collected data to the gateway node through the zigbee wireless network. The wireless gateway node is then sent to the remote monitoring center through 3G/4G. The monitoring center stores, processes and displays the obtained elevator operation data, and analyzes whether the elevator is in a healthy running state. If the data is not within the safe range, the property company and the elevator maintenance unit will be notified immediately to deal with it in time to prevent dangerous accidents and prevent them from happening before they happen.
The zigbee module mainly sends the commands of the remote monitoring platform to each sub-node through the zigbee network, so as to manage each sub-node. At the same time, according to the situation of each node, the received node information is transmitted to the monitoring center for storage and data analysis and processing. The gateway node can perform corresponding data processing according to the node address in the data frame.
ZLG Zhiyuan Electronics’ zigbee high-performance module ZM32 is a high-performance zigbee transparent transmission module designed based on Silicon Labs EFR32MG1 series chips. The module has powerful hardware performance. The transmit power of up to 19dBm and the receive sensitivity of -99dBm ensure that the module can penetrate the wall. capability and a line-of-sight communication distance of over 3.3 km. In terms of mesh networking, the module can complete an ad hoc network of 100 devices within 100 seconds, and supports dynamic switching of three communication modes: short address, long address, and data frame address, making it more flexible to use.
Figure 3 ZM32 wireless module
Zigbee elevator fault diagnosis system fundamentally solves the chaos of “false maintenance” and “going through the motion maintenance”, and the emergency response speed is fast, from the perception layer, to edge computing, transmission, cloud computing to the final terminal platform, and finally No more than 1 second, which relies on the interaction between advanced perception technology, edge computing technology and cloud platform. On the edge side of the network near the perception data, a distributed open platform that integrates network, computing, storage, and application core capabilities provides edge intelligent services nearby, meeting the needs of elevator digitalization in agile connections, real-time services, data optimization, application intelligence, security and privacy. Critical needs in protection.
The Links: SKIIP 83AC12ISMT10 CM1000DUC-34SA