A comprehensive protection device for lighting signals used in mines

Abstract

A comprehensive protection device for lighting signals for mining, including a main circuit, a control circuit and a protection plug-in, wherein the control circuit has a power-on button QA, a power-off button TA, a contactor KM and a normally closed switch J; a current transformer is provided on the main circuit, and the current transformer is connected to the input end of a single-chip microcomputer after rectification and filtering; the output end of the single-chip microcomputer is connected to a J switch relay, and when the current transformer senses that there is a short circuit or leakage in the main circuit, the single-chip microcomputer activates the J switch relay to disconnect the normally closed switch J. In the case that the protection plug-in falls off or the control circuit fails, the comprehensive protection device for lighting signals for mining can automatically determine whether a short circuit or leakage occurs in the lighting system or the signal load system, and cut off the main circuit in time, thereby avoiding electric shock accidents and improving the safety of mining production.

Description

Technical Field

[0001] The utility model relates to the technical field of mining electrical appliances, in particular to a mining lighting signal comprehensive protection device. Background Art

[0002] The lighting signal integrated protection device is a power supply for 127V lighting and signal loads in the mine, and has short circuit and leakage protection functions. The existing lighting signal integrated protection device usually uses analog circuits, and its protection function is not reliable. In the mine with large vibration and harsh working environment, the protection plug-in may fall off and the control circuit may also fail.

[0003] The current problem is that when the protection plug falls off or the control circuit fails, the existing lighting signal integrated protection device can still close and supply power normally, causing the protection device to lose its short-circuit and leakage protection function, seriously affecting the safety of mining production. Utility Model Content

[0004] In order to overcome the shortcomings of the background technology, the utility model discloses a comprehensive protection device for lighting signals for mines, which adopts the following technical solutions:

[0005] A comprehensive protection device for mining lighting signals comprises a main circuit, a control circuit and a protection plug-in, wherein the control circuit comprises a power-on button QA, a power-off button TA, a contactor KM and a normally closed switch J; a current transformer is arranged on the main circuit, and the current transformer is connected to the input end of a single-chip microcomputer after rectification and filtering; the output end of the single-chip microcomputer is connected to a J switch relay, and when the current transformer senses that there is a short circuit or leakage in the main circuit, the single-chip microcomputer activates the J switch relay to disconnect the normally closed switch J.

[0006] To further improve the technical solution, the output end of the single chip microcomputer is also connected to an alarm, and the alarm sounds an alarm by emitting sound or light.

[0007] To further improve the technical solution, the single chip microcomputer is also connected to a CAN bus and remotely communicates with the control room via the CAN bus.

[0008] To further improve the technical solution, the model of the single chip microcomputer is P87C591, the CAN controller therein is expanded with a CAN transceiver 82C250, and the single chip microcomputer remotely communicates with the control room via the CAN transceiver 82C250 and the CAN bus.

[0009] To further improve the technical solution, the current transformer is connected to the lighting power supply line, the signal load power supply line and the grounding line of the main circuit respectively.

[0010] After implementing the above technical solution, compared with the background technology, the beneficial effects produced by the utility model are:

[0011] When the protection plug-in falls off or the control circuit fails, the integrated protection device for mine lighting signals can automatically determine whether a short circuit or leakage occurs in the lighting system or the signal load system, and cut off the main circuit in time, thus avoiding electric shock accidents and improving the safety of mining production. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attached Figure 1 Shown is a partial circuit diagram of the lighting signal comprehensive protection device.

[0013] Attached Figure 2 Shown is the control flow chart of the microcontroller.

[0014] In the attached figure: 1. Main circuit; 2. Control circuit; 3. Current transformer. DETAILED DESCRIPTION

[0015] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. It should be noted that in the description of the present invention, the terms "front", "rear", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of description, rather than indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0016] Attached Figure 1 What is shown is a partial circuit diagram of the integrated protection device for lighting signals used in mines, which includes a main circuit 1, a control circuit 2 and a protection plug-in (existing technology, not shown in the figure), which is described in detail below.

[0017] The main circuit 1 is mainly composed of the main switch K, the main transformer ZB and multiple fuses. The main circuit 1 is connected to a single-phase 127V AC power supply to provide lighting power supply and signal load power supply.

[0018] The control circuit 2 has a power-on button QA, a power-off button TA, a contactor KM and a normally closed switch J, wherein contacts No. 1-3 of the contactor KM are used to connect or disconnect the three-phase power surface, and contact No. 4 of the contactor KM is used for self-protection.

[0019] The working principle of control circuit 2 is: when the power-on button QA is pressed, the KM coil is connected, the contacts 1-3 of the contactor KM are closed, and the main circuit is energized; at the same time, the contact 4 of the contactor KM is closed for self-protection, and the power-on button QA can be disconnected. When the power-off button TA is pressed, the KM coil is de-energized, and at this time, the contacts 1-4 of the contactor KM are disconnected, and the main circuit is de-energized.

[0020] When the protection plug falls off or the control circuit fails, since KM4 is in a self-protection state and the normally closed switch J cannot be disconnected, the main circuit is energized and can still supply power to the lighting system and signal load system. This causes the protection device to lose its short-circuit and leakage protection function, seriously affecting the safety of mining production.

[0021] See attached Figure 1 and attached Figure 2 , attached Figure 2 The control flow chart of the single chip microcomputer is shown. In order to solve the above problem, a current transformer 3 is provided on the main circuit, and the current transformer 3 is respectively connected to the lighting power supply line, the signal load power supply line and the grounding line of the main circuit. The current sensed by the current transformer 3 is connected to the input end of the single chip microcomputer after rectification and filtering, and the single chip microcomputer samples the current to obtain the magnitude. Then, after calculation and comparison by the single chip microcomputer, it is determined whether a short circuit occurs in the lighting system or the signal load system.

[0022] The output end of the single-chip microcomputer is connected with a J switch relay. When the single-chip microcomputer determines that a short circuit occurs in the lighting system or the signal load system, the J switch relay is driven to operate, disconnect the normally closed switch J, and put the main circuit 1 and the lighting signal integrated protection device into a power-off state to avoid electric shock accidents.

[0023] Similarly, the single-chip microcomputer can determine the insulation of the system by measuring the ground leakage current of the ground wire. When the ground leakage current is greater than the safety value, the single-chip microcomputer will also disconnect the normally closed switch J, so that the main circuit 1 and the lighting signal integrated protection device are in a power-off state.

[0024] In this embodiment, the model of the single-chip microcomputer is P87C591, which is equipped with a 10-bit A / D converter, a 16K memory and a CAN controller. The alternating current sensed by the current transformer is converted into direct current after rectification and filtering, and then converted and collected by the A / D converter, and the current value can be digitally calculated and displayed. The CAN controller is extended with a CAN transceiver 82C250, and the single-chip microcomputer realizes remote communication with the control room through the CAN transceiver 82C250 and the CAN bus.

[0025] In addition, an alarm is connected to the output end of the single-chip microcomputer. When a short circuit or leakage occurs in the lighting system or the signal load system, the alarm sends out an alarm by making a sound or emitting light.

[0026] From the above, it can be seen that when the protection plug-in falls off or the control circuit fails, the integrated protection device for mining lighting signals can automatically determine whether a short circuit or leakage occurs in the lighting system or the signal load system, and cut off the main circuit in time to put the integrated protection device in a power-off state to avoid electric shock accidents.

[0027] Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A comprehensive protection device for lighting signals for mines, comprising a main circuit, a control circuit and a protection plug-in, wherein: The control circuit has a power-on button QA, a power-off button TA, a contactor KM and a normally closed switch J, and is characterized in that: a current transformer is provided on the main circuit, and the current transformer is connected to the input end of the single-chip microcomputer after rectification and filtering; the output end of the single-chip microcomputer is connected to the J switch relay, and when the current transformer senses that there is a short circuit or leakage in the main circuit, the single-chip microcomputer activates the J switch relay to disconnect the normally closed switch J.

2. A mining lighting signal integrated protection device as claimed in claim 1, characterized in that: The output end of the single chip microcomputer is also connected to an alarm, which alarms by emitting sound or light.

3. A mining lighting signal integrated protection device as claimed in claim 1, characterized in that: The single chip microcomputer is also connected to a CAN bus and remotely communicates with a control room via the CAN bus.

4. A mining lighting signal integrated protection device as claimed in claim 3, characterized in that: The model of the single chip microcomputer is P87C591, and the CAN controller therein is extended with a CAN transceiver 82C250. The single chip microcomputer remotely communicates with the control room via the CAN transceiver 82C250 and the CAN bus.

5. A mining lighting signal integrated protection device as claimed in claim 1, characterized in that: The current transformer is respectively connected to the lighting power supply line, the signal load power supply line and the grounding line of the main circuit.

Images