“As a common equipment in daily life, the importance of elevators in terms of safety performance and fault warning is self-evident. The causes of elevator failures and safety problems are very complex, and how to efficiently prevent them has become an urgent problem to be solved. This article will introduce how wireless communication can shine in the maintenance of elevator safety.
Abstract: As a commonly used equipment in daily life, the importance of elevators in safety performance and fault warning is self-evident. The causes of elevator failures and safety problems are very complex, and how to efficiently prevent them has become an urgent problem to be solved. This article will introduce how wireless communication can shine in the maintenance of elevator safety.
For most residents living in high-rise residential buildings, the elevator is “the first step to go out and the last way home”. Although the accident rate of accidents caused by elevators is extremely low, elevators, as one of the special equipment that people have frequent daily contact, frequent use, and are more concerned about, 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 summarized in the following aspects: one is external reasons, such as power outages of the elevator during operation, and the temperature of the machine room is too high; the other is man-made reasons, such as decoration garbage that causes elevator damage, and rough handling causes elevator door deformation , Overload operation, etc.; The third is the system reasons, such as the failure of the elevator door lock, the failure of the door machine, 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 overhaul and frequent maintenance are the basic conditions for an elevator to be used for a long time, while less repair and careless maintenance are the culprits of accidents.
Although the elevator maintenance unit will regularly maintain the elevator, if the elevator fails, the rescue will not be timely and secondary injury will occur, and because the passengers’ description of the failure is not in place, the effective repair of the failure will be affected. How to effectively solve these kinds of failures and maintain the safety of users on elevators efficiently and at low cost. Wireless communication will shine in this regard.
The wireless elevator fault early warning system is mainly composed of three parts: sensor terminal collection 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 top of the car. It is responsible for monitoring the elevator operating parameters and sending the collected data to the gateway node through the zigbee wireless network. The wireless gateway node sends it 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 operation state. If the data is not within the safe range, it will immediately notify the property management company and elevator maintenance unit to deal with it in a timely manner to prevent dangerous accidents from happening and take precautions.
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 information of each node 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 based on Silicon Labs EFR32MG1 series chips. The module has strong hardware performance. The transmission power of up to 19dBm and the receiving sensitivity of -99dBm ensure that the module can penetrate the wall. Capability and line-of-sight communication distance of more than 3.3 kilometers. 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
The Zigbee elevator fault diagnosis system fundamentally solves the chaos of “false maintenance” and “movement maintenance”, and the emergency response speed is fast, from the perception layer, to edge computing, transmission, cloud computing, and the final terminal platform. No more than 1 second, which depends on the interaction between advanced perception technology, edge computing technology and cloud platform. On the edge of the network that is close to the perception of data, a distributed open platform that integrates core capabilities of network, computing, storage, and applications, provides edge intelligent services nearby, and meets the requirements of agile connection, real-time services, data optimization, application intelligence, security and privacy in elevator digitization. Key protection requirements.