Synchronous contact type detection method and device for feed state of mining feed switch

Abstract

The invention discloses a synchronous contact type detection method for a feed state of a mining feed switch, which comprises the following steps of: carrying out electricity-light-electricity isolation conversion on a 5V intrinsic safety power supply, transmitting a converted high level to a passive synchronous contact of a detected high-voltage explosion-proof switch, and when the synchronous contact of the high-voltage explosion-proof switch is in a closed state, switching on the high-voltage explosion-proof switch; if the synchronous contact of the high-voltage explosion-proof switch is in an off state, the electrical-optical-electrical isolation device does not form an access, the low electrical level representing no electricity is sent to the IO pin of the single chip microcomputer, the single chip microcomputer detects the level change and processes and encodes the signal, and the high-voltage explosion-proof switch is switched on. And finally, the 485 signal is transmitted and sent out. The device is high in reliability and safety, is not affected by high and low detected voltage, is convenient to install, is sensitive in detection, and is low in requirements for an installation environment. The device can be compatible with feed detection of various mine devices, and has wide application.

Description

Technical Field

[0001] The invention relates to a synchronous contact type detection method and device for the feeding state of a mine feeding switch, belonging to the technical field of coal mine safety monitoring equipment. Background Art

[0002] Currently, underground coal mines utilize a large number of power supply monitoring sensors. These sensors are critical safety devices used to monitor the status of power supply lines, ensuring proper system power supply and preventing overloads, undervoltages, or power outages. Their functions include current detection, voltage monitoring, and power outage alarms. Commonly used power supply sensors fall into two categories: inductive and access-type. Inductive detection is less sensitive when detecting armored cables, while access-type detection, due to live electrical connections at the detection end, places high demands on the installation environment.

[0003] The flameproof, high-voltage vacuum distribution device (HEV switchgear) used in coal mines is a key component of underground high-voltage power distribution systems, primarily used to control and protect high-voltage motors, transformers, and other high-voltage electrical equipment. Due to the presence of flammable and explosive substances such as gas and coal dust in coal mines, HEV switches must meet strict explosion-proof requirements to ensure safe operation.

[0004] The currently available power supply sensors cannot safely and accurately detect the power-on and power-off states of high-explosive switches. Summary of the Invention

[0005] The present invention aims to provide a method and device for detecting the feed status of a mine-used feeder switch using synchronous contact technology. This feed status synchronous contact sensor, which is not connected to a live object, detects the on / off state changes of the mine-used high-explosive switch's synchronous contacts and indirectly detects the switch's power-on and power-off states through passive contact sampling, thereby indicating whether the feeder is energized or not. This level change is converted into signal code by a single-chip microcomputer, and the feed status data is transmitted and output via the 485 protocol.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A synchronous contact detection method for feeding state of a mine feeding switch, comprising:

[0008] The 5V intrinsically safe power supply is converted through electrical-optical-electrical isolation, and the converted high level is sent to the passive synchronous contacts of the high-voltage explosion-proof switch to be tested. When the synchronous contacts of the high-voltage explosion-proof switch are in the closed state, the contact closure allows the current to pass through the electrical-optical-electrical isolation device to form a path, and the high level representing the power is sent to the IO pin of the microcontroller. If the synchronous contacts of the high-voltage explosion-proof switch are in the open state, the electrical-optical-electrical isolation device does not form a path, and the low level representing the absence of power is sent to the IO pin of the microcontroller. The microcontroller detects the level change, encodes the signal processing, and finally transmits it as a 485 signal.

[0009] A synchronous contact-type detection device for the feeding status of a mine feed switch comprises an intrinsically safe power supply, a dual-channel electro-optical-electrical isolation device, and a single-chip microcomputer. The intrinsically safe power supply is connected to the single-chip microcomputer to provide 5V power for the single-chip microcomputer to operate. The intrinsically safe power supply also transmits the 5V power to the inlet of one channel of the electro-optical-electrical isolation device. The outlet of the electro-optical-electrical isolation device is connected to one end of a synchronous contact of a high-voltage explosion-proof switch to be detected. The other end of the synchronous contact of the high-voltage explosion-proof switch is connected to the inlet of the other channel of the electro-optical-electrical isolation device. The outlet of the electro-optical-electrical isolation device is connected to the signal input terminal of the single-chip microcomputer. The single-chip microcomputer outputs a coded 485 signal.

[0010] Compared with existing technologies, the present invention offers the following advantages: This power feed sensor utilizes the status of the synchronous contacts of a high-explosive switch used in mines to indirectly detect the presence or absence of power feed, resulting in high reliability and safety. Because it detects the synchronous contacts of the high-explosive switch, it is not directly related to the voltage controlled by the switch and is therefore unaffected by high or low voltages being detected. It also offers easy installation, high sensitivity, and minimal requirements for the installation environment. It is compatible with power feed detection for various mining equipment, enabling a wider range of applications and expanded applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural principle diagram of the synchronous contact type detection device for the feeding state of the mine feeding switch of the present invention. DETAILED DESCRIPTION

[0012] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0013] like Figure 1 FIG. 1 is a structural principle diagram of a synchronous contact type detection device for feeding state of a mine feeding switch according to the present invention.

[0014] A synchronous contact-type detection device for the feeding status of a mine-used feeder switch includes an intrinsically safe power supply, a dual-channel electro-optical-electrical isolation device, and a single-chip microcomputer. The intrinsically safe power supply is connected to the single-chip microcomputer to provide 5V power for the single-chip microcomputer to operate; the intrinsically safe power supply also transmits the 5V power to the input of one channel of the electro-optical-electrical isolation device, the output of which is connected to one end of a synchronous contact of a high-voltage explosion-proof switch to be detected, the other end of the synchronous contact of the high-voltage explosion-proof switch is connected to the input of another channel of the electro-optical-electrical isolation device, and the output of which is connected to the signal input terminal of the single-chip microcomputer.

[0015] When using this device to perform synchronous contact detection of the feeding status of a mine-used high-voltage explosion-proof switch, the process is as follows:

[0016] The 5V intrinsically safe power supply is converted through electrical-optical-electrical isolation, and the converted high level is sent to the passive synchronous contact of the high-voltage explosion-proof switch to be tested. When the synchronous contact of the high-voltage explosion-proof switch is in the closed state, the contact closure allows the current to pass through the electrical-optical-electrical isolation device to form a path, and the high level representing the power is sent to the IO pin of the microcontroller. If the synchronous contact of the high-voltage explosion-proof switch is in the open state, the electrical-optical-electrical isolation device does not form a path, and the low level representing the absence of power is sent to the IO pin of the microcontroller. The microcontroller detects the level change, processes and encodes the level signal, and finally transmits it as a 485 signal. The host computer obtains the real-time synchronous power feeding status of the high-voltage explosion-proof switch.

[0017] In addition to the above embodiments, the present invention may also have other implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. A synchronous contact detection method for feeding status of a mine feeding switch, characterized in that: include: The 5V intrinsically safe power supply is converted through electrical-optical-electrical isolation, and the converted high level is sent to the passive synchronous contacts of the high-voltage explosion-proof switch to be tested. When the synchronous contacts of the high-voltage explosion-proof switch are in the closed state, the contact closure allows the current to pass through the electrical-optical-electrical isolation device to form a path, and the high level representing the power is sent to the IO pin of the microcontroller. If the synchronous contacts of the high-voltage explosion-proof switch are in the open state, the electrical-optical-electrical isolation device does not form a path, and the low level representing the absence of power is sent to the IO pin of the microcontroller. The microcontroller detects the level change, encodes the signal processing, and finally transmits it as a 485 signal.

2. A synchronous contact detection device for feeding state of a mine feeding switch, characterized in that: The system includes an intrinsically safe power supply, a dual-channel electro-optical-electrical isolation device, and a single-chip microcomputer. The intrinsically safe power supply is connected to the single-chip microcomputer to provide 5V power for the single-chip microcomputer to operate. The intrinsically safe power supply also transmits the 5V power to the input of one channel of the electro-optical-electrical isolation device. The output of the electro-optical-electrical isolation device is connected to one end of the synchronous contact of the high-voltage explosion-proof switch to be detected. The other end of the synchronous contact of the high-voltage explosion-proof switch is connected to the input of the other channel of the electro-optical-electrical isolation device. The output of the electro-optical-electrical isolation device is connected to the signal input end of the single-chip microcomputer. The single-chip microcomputer outputs a 485 signal that has been encoded and processed.

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