Construction Machinery Remote Monitoring System

Introduction

GPRS is the English abbreviation of General Packet Radio Service. It is a wireless packet switching technology based on the GSM system, providing end-to-end, wide-area wireless connections. Packet switching technology is used. Each user can occupy multiple wireless channels at the same time, and the same wireless channel can be shared by multiple users, and resources are effectively utilized. Dumping users is always online and billed by traffic, which quickly reduces service costs, thus providing an efficient and low-cost wireless packet data service. Especially suitable for intermittent. Cold hair and frequent, small data transmission, also suitable for occasional large data transmission. The theoretical bandwidth of GPRS DTU data transmission can reach 171 2Kbit/s. The actual application bandwidth is about 20-100KBit/s. TCP/IP connection is provided on this channel, which can be used for Internet connection, data transmission and other applications.

Construction Machinery Remote Monitoring System

The construction machinery remote monitoring system uses computer detection technology and wireless communication technology to monitor the running status and construction progress of the construction machinery under construction, and transmits the monitoring results back to the monitoring center for statistics and analysis; the driver can use the system to The problems encountered in the construction are told to the monitoring center, and the experts in the monitoring center will guide them remotely. The system block diagram is shown in the figure.

The system is mainly composed of airborne monitoring system, GPRS DTU data transmission module, Internet transmission part and remote monitoring end point (RTU). Since the monitoring pair (such as truck cranes, excavators, etc.) is constantly moving, the airborne monitoring system can only transmit the detected data to the remote monitoring center in time through the wireless communication system. The airborne monitoring system detects the data and operating state of the on-site construction machinery, sends it to the GPRS module through RS-232, and sends the data to the GPRS network through the GPRS module. Since both the GPR network and the Internet are based on the port protocol and are connected to each other. So as long as the remote monitoring center can surf the Internet in any way, the on-site data can be transparently transmitted to the monitoring center through the GPRS network. Similarly, various commands issued by the remote monitoring center can also be transmitted to each GRPS module in a corresponding manner. This system adopts the GPRS-based wireless data transmission module Liu JY-MD developed by our company. The module provides users with a high-speed, always-on, transparent data transmission virtual private data communication network, which can realize various networking methods such as point-to-point, center-to-multipoint, and peripheral devices, forming a two-way, peer-to-peer, real-time data transformation system. It is widely used in industry applications such as information exchange and remote data collection.

How the GPRS module works

GPRS DTU refers to the industrial-grade GSM/GPRS MODEM JY-MD model. It is a dial-up Internet access device based on the mobile GSM/GPRS network platform and embedded with industrial-grade GSM/GPRS wireless modules. The product is specially designed for the complex environment of the industrial site, through the RS-232 or RS-485 interface. Using a simple AT command interactive interface, so that the user is faced with the AT command interface based on serial communication, which can complete end-to-end reliable data communication. Schematic block diagram:

Internal structure diagram of wireless module

Features:

Standard RS232 or RS485 interface; support standard AT commands; support short message and dial-up data transmission; industrial-grade power supply: DC7V~ DC30V, built-in power reverse protection; industrial-grade wireless module: embedded German Siemens wireless module, anti-interference Strong, stable transmission; metal shell: metal shell, anti-radiation, anti-interference; lightning protection design; in line with power safety requirements; all wireless modules have passed CGD certification or FCC certification or CE certification.

Take pump monitoring as an example:

Monitoring software interface:

Real time display

1. The device list on the left shows the information of the current online and offline devices. When the device is connected to the Internet, it will enter the "online device list" from the "offline device list", and the device will enter the "offline device list" from the "online device list" if it is not online for a long time. Device List ";

2. The upper right corner displays the device number, user name, contact person, running date, expiration date, telephone, fax, mobile phone, address, SIM card number and other information;

3. The upper left corner displays the pump speed, pump current, tank liquid level, tank flow, inbound pressure and other information;

4. Real-time display of pump speed, pump current, tank liquid level, tank flow, inbound pressure and other curves under the window;

5. The text in the middle prompts the current device login time and the last time to collect and return data;

History

1. Users can search history according to time period;

2. The history record will be drawn on the window in the form of a curve, and the history record can be displayed under the window in the form of a list. Through the history record, the equipment operation status and related trends can be viewed;

3. The history records queried at the same time can be exported as excel tables;

Configuration software renderings

Users can customize the program through configuration software as needed, so that the interface expression is more flexible;

Concluding remarks

The successful application of GPRS DTU in the remote monitoring system of construction machinery not only realizes the remote monitoring and control of construction machinery, but also lays a good foundation for the realization of remote fault diagnosis of construction machinery and the reasonable scheduling and management of construction machinery clusters. Improve the management level of construction machinery. Optimize mechanized construction organization. Improve economic benefits. With the advent of the Internet era, GPRS technology will have greater application space and development prospects in remote monitoring systems.