CN203204425U - Safety monitoring system based on CAN bus - Google Patents

Abstract

A safety monitoring system based on a CAN bus comprises a host computer, a safety barrier, a CAN bus and a detection node, wherein the host computer, the safety barrier, the CAN bus and the detection node are connected with each other. The detection node comprises a CAN bus communication interface, a single-chip microcomputer, an alarm module, an interlocking power-off module, a sensor interface module and a sensor group, wherein the sensor group is connected with the sensor interface module, the sensor interface module, the CAN bus communication interface, the alarm module and the interlocking power-off module are respectively connected with the single-chip microcomputer, and the sensor group comprises a temperature sensor, a pressure transducer, a combustible gas sensor, an oxygen sensor and a wind speed sensor. The safety monitoring system is easy for installation, stable in operation, excellent in anti-interference performance and rapid in data transmission.

Description

A Security Monitoring System Based on CAN Bus

technical field

The utility model relates to a monitoring system, in particular to a safety monitoring system based on CAN bus.

Background technique

The underground environment of coal mines is humid, the space is small, the mine dust is large, there are flammable and explosive gases such as methane, and corrosive gases such as hydrogen sulfide. Therefore, the mine monitoring system needs to take anti-explosion measures to achieve special requirements such as long-distance signal transmission. . Downhole measurement and control is generally composed of DCS or field bus. The DCS system is an analog system, which is not suitable for harsh environments with severe electromagnetic interference. The field bus system belongs to the digital communication system, which can lead all the field instrument signals to the control room through a cable, and realize the remote transmission of signals under strong interference conditions, which can meet the needs of underground monitoring. At present, the most commonly used communication network is RS485, but RS485 can only perform master-slave communication, which has poor real-time performance and reliability, and high failure rate.

Contents of the invention

In order to overcome the deficiencies of the prior art, the utility model provides a safety monitoring system which is easy to install, stable in operation, strong in anti-interference and fast in data transmission.

The technical scheme adopted by the utility model is: a safety monitoring system based on CAN bus, including a host computer, a safety barrier, a CAN bus, and a detection node, and the host computer, a safety barrier, a CAN bus, and a detection node are connected in sequence, and the detection The node is composed of CAN bus communication interface, single-chip microcomputer, alarm module, interlock power-off module, sensor interface module and sensor group.

The sensor group is connected with the sensor interface module, and the sensor interface module, the CAN bus communication interface, the alarm module, and the interlock power-off module are respectively connected with the single-chip microcomputer.

Further, the sensor group is composed of a temperature sensor, a pressure sensor, a combustible gas sensor, an oxygen sensor, and a wind speed sensor.

Beneficial effects of the utility model: the utility model provides a safety monitoring system which is easy to install, stable in operation, strong in interference resistance and fast in data transmission.

Description of drawings

Fig. 1 is a system block diagram of the utility model.

Detailed ways

As shown in Figure 1, a safety monitoring system based on CAN bus includes a host computer 1, a safety barrier 2, a CAN bus 3, and a detection node 4, and the host computer 1, safety barrier 2, CAN bus 3, and detection nodes 4 are connected in sequence , the detection node 4 is composed of a CAN bus communication interface 5, a single-chip microcomputer 6, an alarm module 7, an interlock power-off module 8, a sensor interface module 9, and a sensor group 10, and the sensor group 10 is connected to the sensor interface module 9 , sensor interface module 9, CAN bus communication interface 5, alarm module 7, interlock power-off module 8 are connected with single chip microcomputer 6 respectively, and sensor group 10 is made up of temperature sensor, pressure sensor, combustible gas sensor, oxygen sensor, wind speed sensor.

The main function of the system is to monitor the working environment and send out alarm signals and power-off control signals when necessary. The detection node 4 in the downhole is connected to the on-site CAN node nearby, and then the detected signal is sent to the upper computer in the control room above the well through the CAN bus 3 .

Under normal working conditions, the detection node 4 regularly detects various environmental parameters and transmits them to the upper computer 1 through the CAN bus 3; when a fault occurs, the fault signal is transmitted to other execution nodes and the upper computer 1 through the CAN bus 3 at the same time. The system will alarm, locate faults, and take emergency measures; the local detection node 4 will alarm on the spot, and control non-intrinsically safe equipment to be powered off or restored.

Claims (3)

1. A safety monitoring system based on CAN bus, comprising upper computer, safety barrier, CAN bus, detection node, upper computer, safety barrier, CAN bus, detection node are connected successively, it is characterized in that: described detection node is by CAN Composed of bus communication interface, single chip microcomputer, alarm module, interlock power-off module, sensor interface module and sensor group. 2. A kind of safety monitoring system based on CAN bus according to claim 1, it is characterized in that: described sensor group is connected with sensor interface module, sensor interface module, CAN bus communication interface, alarm module, interlock power-off The modules are respectively connected with the single chip microcomputer. 3. A safety monitoring system based on CAN bus according to claim 1, characterized in that: said sensor group is composed of a temperature sensor, a pressure sensor, a combustible gas sensor, an oxygen sensor, and a wind speed sensor.

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