Mining fan protection circuit

Abstract

The utility model discloses a mining fan protection circuit, comprising a master control CPU circuit used for data processing; the reset circuit is connected with the main control CPU and is used for inputting a reset signal to the main control CPU; the gas concentration acquisition circuit is connected with the main control CPU and is used for inputting gas concentration data to the main control CPU circuit; the communication circuit is connected with the main control CPU circuit and is used for communication; the expansion circuit is connected with the main control CPU circuit and is used for expanding the acquisition interface; the acquisition circuit is connected with the expansion circuit and is used for acquiring temperature, current and voltage data; and the control circuit is connected with the main control CPU and is used for controlling the mining fan. The mining fan monitoring device has the functions of temperature, current and voltage acquisition and the like, protects the use stability of a mining fan, also has the function of gas concentration acquisition, and enhances the action effect of equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of protection circuits for mining fans, in particular to a protection circuit for mining fans. Background Art

[0002] Mining fans are a type of axial flow fan. Due to the particularity of their use and application, as well as significant differences in performance parameters and dimensions from general axial flow fans, they are classified separately. They are primarily used for mine ventilation.

[0003] At present, the mine ventilation protection circuit function does not have a complete protection function. Therefore, a mine fan protection circuit is designed. Summary of the Invention

[0004] According to an embodiment of the present invention, a protection circuit for a mining fan is provided, comprising:

[0005] Main control CPU circuit, used for data processing;

[0006] Reset circuit, the reset circuit is connected to the main control CPU and is used to input a reset signal to the main control CPU;

[0007] The gas concentration collection circuit is connected to the main control CPU and is used to input gas concentration data to the main control CPU circuit;

[0008] Communication circuit, the communication circuit is connected to the main control CPU circuit for communication;

[0009] The expansion circuit is connected to the main control CPU circuit and is used to expand the acquisition interface;

[0010] The acquisition circuit is connected to the expansion circuit and is used to collect temperature, current and voltage data;

[0011] The control circuit is connected to the main control CPU and is used to control the mining fan.

[0012] Furthermore, the reset circuit comprises:

[0013] a first resistor, one end of the first resistor being connected to an external reset button;

[0014] a first optocoupler connected to the other end of the first resistor;

[0015] A second resistor, one end of the second resistor is connected to the first optocoupler, and the other end of the second resistor is connected to 3.3VD;

[0016] A third resistor, one end of the third resistor is connected to the first optical coupler, the other end of the third resistor is connected to the main control CPU circuit, and is grounded through the first capacitor.

[0017] Furthermore, the gas concentration collection circuit includes:

[0018] a fourth resistor connected to an external gas concentration detection sensor;

[0019] a fifth resistor connected to an external gas concentration detection sensor;

[0020] a second optocoupler connected to the other end of the fourth resistor, the other end of the fifth resistor, and 3.3VD;

[0021] a second capacitor, one end of the second capacitor being connected to the other end of the fourth resistor and the other end of the fifth resistor;

[0022] a sixth resistor, one end of the sixth resistor being connected to the second optocoupler and the other end being grounded;

[0023] A seventh resistor, one end of the seventh resistor is connected to the second optical coupler, and the other end is connected to the main control CPU circuit.

[0024] Furthermore, the expansion circuit includes:

[0025] A first multiplexer, the first multiplexer is connected to the main control CPU circuit;

[0026] The second multiplexer is connected to the main control CPU circuit.

[0027] Furthermore, the acquisition circuit includes:

[0028] A temperature acquisition circuit is connected to the expansion circuit;

[0029] A current collection circuit is connected to the expansion circuit;

[0030] The voltage acquisition circuit and the current acquisition circuit are connected to the expansion circuit.

[0031] Furthermore, the temperature acquisition circuit is two-way.

[0032] Furthermore, any temperature acquisition circuit includes:

[0033] an eighth resistor, one end of the eighth resistor being connected to an external platinum thermal resistor, and the other end of the eighth resistor being connected to 3.3VD;

[0034] A ninth resistor, one end of which is connected to 3.3VD;

[0035] a tenth resistor, one end of the tenth resistor being connected to the other end of the ninth resistor, and the other end being grounded;

[0036] an eleventh resistor, one end of the eleventh resistor being connected to an external platinum thermal resistor;

[0037] an operational amplifier, wherein a non-inverting input terminal of the operational amplifier is connected to the other end of the eleventh resistor;

[0038] a twelfth resistor, one end of the twelfth resistor being connected between the other end of the eleventh resistor and the non-inverting input terminal of the operational amplifier, and the other end being grounded;

[0039] a thirteenth resistor, one end of the thirteenth resistor being connected between the other end of the ninth resistor and the other end of the tenth resistor, and the other end of the thirteenth resistor being connected to the inverting input terminal of the operational amplifier;

[0040] a fourteenth resistor, one end of the fourteenth resistor being connected between the other end of the thirteenth resistor and the inverting input terminal of the operational amplifier, and the other end of the fourteenth resistor being connected to the output terminal of the operational amplifier;

[0041] a fifteenth resistor, one end of the fifteenth resistor being connected to the output end of the operational amplifier, and the other end being connected to the main control CPU circuit;

[0042] A third capacitor has one end connected to one end of the fifteenth resistor and the other end grounded.

[0043] According to an embodiment of the present invention, a protection circuit for a mining fan has functions such as temperature, current, and voltage collection to protect the stability of the mining fan, and also has a gas concentration collection function to enhance the effect of the equipment.

[0044] It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the technology as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 The present invention is a circuit diagram of a main control CPU circuit of a mine fan protection circuit according to an embodiment of the present invention.

[0046] Figure 2 The present invention is a circuit diagram of a reset circuit of a mine fan protection circuit according to an embodiment of the present invention.

[0047] Figure 3 The present invention is a circuit diagram of a gas concentration acquisition circuit for a mine fan protection circuit according to an embodiment of the present invention.

[0048] Figure 4 The present invention is a circuit diagram of a communication circuit of a mine fan protection circuit according to an embodiment of the present invention.

[0049] Figure 5 The present invention is a circuit diagram of an expansion circuit of a mine fan protection circuit according to an embodiment of the present invention.

[0050] Figure 6The present invention is a circuit diagram of a temperature acquisition circuit of a mine fan protection circuit according to an embodiment of the present invention.

[0051] Figure 7 The present invention is a circuit diagram of a current acquisition circuit of a mine fan protection circuit according to an embodiment of the present invention.

[0052] Figure 8 The present invention is a circuit diagram of a voltage acquisition circuit of a mine fan protection circuit according to an embodiment of the present invention.

[0053] Figure 9 The present invention is a circuit diagram of a clock circuit of a mine fan protection circuit according to an embodiment of the present invention.

[0054] Figure 10 The present invention is a circuit diagram of a control circuit of a mine fan protection circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0055] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to further illustrate the present invention.

[0056] First, combine Figures 1 to 10 A mine fan protection circuit according to an embodiment of the present invention is described, which is used on a mine fan and has a wide range of application scenarios.

[0057] like Figures 1 to 10 As shown, a mine fan protection circuit according to an embodiment of the present utility model comprises a main control CPU circuit, a reset circuit, a gas concentration acquisition circuit, a communication circuit, an expansion circuit, an acquisition circuit and a control circuit.

[0058] Specifically, if Figure 1 As shown, the main control CPU circuit is used for data processing. The CPU chip U9 adopts the model GD32F103RBT6, which has high cost performance and low power consumption. It can run for a long time with low power consumption. It also has high integration, multiple interfaces, and a wide range of application scenarios.

[0059] Pin explanation:

[0060] Crystal oscillator circuit: The crystal oscillator circuit mainly provides a stable frequency for the entire system, which is equivalent to a heart. Pin 5 is Y1-2, and pin 6 is Y1-1.

[0061] Display control system: Control LCD by simulating SPI with GD32.

[0062] Pins 2, 62, 61, 59, and 58 control the LCD screen. The LCD screen is the display system of the entire fan protection device. Pin 2 is SCLK, which is mainly responsible for generating a clock signal for synchronizing the data of the LCD screen with the data of the CPU chip U9. It mainly determines the communication rate. Pin 62 LBG is mainly controlled by the CPU to control the brightness of the screen by high and low levels, thereby achieving the backlight effect. Pin 59 LCS is the selection signal line, also called the chip select signal line. When the host wants to select a slave device, the LCS signal line of the device is set to a low level. The device is selected and the chip select is valid. Then the CPU chip U9 communicates with the LCD screen. Pin 58 LRST is the host reading data from this signal line, and the slave data is output to the host by this signal line.

[0063] Specifically, if Figure 2 As shown, the reset circuit is connected to the main control CPU and is used to input a reset signal to the main control CPU. The reset circuit includes: a first resistor R95, a first optocoupler U19, a second resistor R96 and a third resistor R93. One end of the first resistor R95 is connected to an external reset button; the first optocoupler U19 is connected to the other end of the first resistor R95; one end of the second resistor R96 is connected to the first optocoupler U19, and the other end of the second resistor R96 is connected to 3.3VD; one end of the third resistor R93 is connected to the first optocoupler U19, and the other end of the third resistor R93 is connected to the main control CPU circuit and grounded through the first capacitor C10. Pin 7 of the CPU chip U9 is connected to KFW0, and a reset button is connected to KFW externally, and the other end is connected to 12v. When the reset button is pressed, the first optocoupler U19 is turned on, and the CPU chip U9 receives the signal. Pin 7 of the CPU chip U9 has a reset function, and automatically resets when it detects that the reset button has been pressed. As shown Figure 3 As shown, the principles of pins 33, 34, 35, 39, 40, 41, 44, and 45 of the CPU chip U9 are the same as above, among which pin 39 is one of them. By connecting KLJ in the contactors of the two protection devices, the status of the main and auxiliary switches can be known to prevent the communication from being disconnected and the two switches from starting at the same time, which will blow up the air duct.

[0064] like Figure 3As shown, the gas concentration acquisition circuit is connected to the main control CPU and is used to input gas concentration data to the main control CPU circuit. The gas concentration acquisition circuit includes: a fourth resistor R124, a fifth resistor R129, a second optical coupler U23, a second capacitor C21, a sixth resistor R127, and a seventh resistor R123. The fourth resistor R124 is connected to an external gas concentration detection sensor; the fifth resistor R129 is connected to an external gas concentration detection sensor; the second optical coupler U23 is connected to the other end of the fourth resistor R124, the other end of the fifth resistor R129, and 3.3VD; one end of the second capacitor C21 is connected to the other end of the fourth resistor R124 and the other end of the fifth resistor R129; one end of the sixth resistor R127 is connected to the second optical coupler U23, and the other end is grounded; one end of the seventh resistor R123 is connected to the second optical coupler U23, and the other end is connected to the main control CPU circuit. Pin 14 KWSP0 of the CPU chip U9 is the gas concentration collection pin. Through a specific sensor, the sensor analyzes the gas concentration and generates a corresponding frequency. The CPU chip U9IO port collects the gas frequency and converts it into the corresponding gas concentration.

[0065] like Figure 4 As shown, the communication circuit is connected to the main control CPU circuit for communication. In this embodiment, pins 16 and 29 of the CPU chip U9 are serial port transmit pins, and pins 17 and 30 are serial port receive pins. Since the serial port pins are TTL level and not suitable for industrial use, we specifically set the circuit to an RS485 circuit. This product has two RS485 channels, one for communication with an external computer switch, and the other for communication with another fan protection device. Because it is used underground in coal mines, the fan must be kept in operation at all times. Therefore, one fan is set as the main unit and the other as the auxiliary unit. Communication is required to ensure that one of the main and auxiliary protection devices is always running.

[0066] like Figure 5 As shown, the expansion circuit is connected to the main control CPU circuit and is used to expand the acquisition interface. The expansion circuit includes: a first multiplexer U33 and a second multiplexer U25. The first multiplexer U33 is connected to the main control CPU circuit; the second multiplexer U25 is connected to the main control CPU circuit. In this embodiment, pin 21 of the CPU chip U9 is CUTA, pin 22 is CUTB, pin 23 is CUTC, pin 24 is ADC1, and pin 25 is ADC3. Due to the limited analog acquisition interface of the GD32 main CPU, the original two acquisition channels are expanded to 16 acquisition channels. CUTA, CUTB, and CUTC are chip select pins. Different high and low level combinations of these three pins are used to select the corresponding acquisition channel.

[0067] like Figures 6-8As shown, the acquisition circuit is connected to the expansion circuit to collect temperature, current, and voltage data. The acquisition circuit includes: a temperature acquisition circuit, a current acquisition circuit, and a voltage acquisition circuit.

[0068] like Figures 6-8 As shown, the temperature acquisition circuit is connected to the expansion circuit. There are two temperature acquisition circuits. Any temperature acquisition circuit includes: an eighth resistor R4, a ninth resistor R5, a tenth resistor R19, an eleventh resistor R11, an operational amplifier U3A, a twelfth resistor R6, a thirteenth resistor R24, a fourteenth resistor R20, a fifteenth resistor R13 and a third capacitor C1. One end of the eighth resistor R4 is connected to an external platinum thermal resistor, and the other end of the eighth resistor R4 is connected to 3.3VD; one end of the ninth resistor R5 is connected to 3.3VD; one end of the tenth resistor R19 is connected to the other end of the ninth resistor R5, and the other end is grounded; one end of the eleventh resistor R11 is connected to an external platinum thermal resistor; the non-inverting input end of the operational amplifier U3A is connected to the other end of the eleventh resistor R11; one end of the twelfth resistor R6 is connected between the other end of the eleventh resistor R11 and the non-inverting input end of the operational amplifier U3A, and the other end is grounded; One end of resistor R24 ​​is connected between the other end of the ninth resistor R5 and the other end of the tenth resistor R19, and the other end is connected to the inverting input of operational amplifier U3A. One end of the fourteenth resistor R20 is connected between the other end of the thirteenth resistor R24 ​​and the inverting input of operational amplifier U3A, and the other end is connected to the output of operational amplifier U3A. One end of the fifteenth resistor R13 is connected to the output of operational amplifier U3A, and the other end is connected to the main control CPU circuit. One end of the third capacitor C1 is connected to one end of the fifteenth resistor R13, and the other end is grounded. The above is a temperature acquisition circuit, which mainly uses an analog amplifier circuit. When collecting temperature, an external PT100 is required. PT100 is a platinum thermistor, and its resistance changes with temperature. When the temperature is 0 degrees Celsius, the resistance is approximately 100 ohms. This is used to determine the temperature of the protection device and achieve high-temperature protection to prevent overheating caused by overload, short circuit, and excessive power in the cavity. The current acquisition circuit is connected to the expansion circuit.

[0069] like Figure 9 The figure shows the clock circuit. In this embodiment, the CPU chip U9's 36th pin (SCL), 37th pin (SDA), and 38th pin (WP) are IIC communication pins. This device requires IIC communication pins primarily for the memory chip and clock chip. The memory chip protects the switch protection device from data loss during power outages, powered by a button battery. The clock chip records the date. SCL and SDA are communication pins. SCL is the clock line, controlling the communication rate, and SDA is the data line, simulated using GD32 software.

[0070] like Figure 10 As shown, the control circuit is connected to the main control CPU for controlling the mining fan. In this embodiment, the 50-56 pins of the CPU chip U9 are used for the front machine protection control, closing control, self-locking control and rear machine control.

[0071] Above, refer to Figures 1 to 10 A mine fan protection circuit according to an embodiment of the present invention is described, which has functions such as temperature, current, and voltage collection to protect the stability of mine fans, and also has a gas concentration collection function to enhance the effect of the equipment.

[0072] It should be noted that, in this specification, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the elements.

[0073] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as limiting the present invention. After reading the above description, various modifications and alternatives to the present invention will be readily apparent to those skilled in the art. Therefore, the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A mine fan protection circuit, characterized in that: Include: Main control CPU circuit, used for data processing; A reset circuit is connected to the main control CPU and is used to input a reset signal to the main control CPU; A gas concentration acquisition circuit, connected to the main control CPU, for inputting gas concentration data to the main control CPU circuit; A communication circuit, connected to the main control CPU circuit, for communication; An expansion circuit, connected to the main control CPU circuit, for expanding the acquisition interface; An acquisition circuit, connected to the expansion circuit, for acquiring temperature, current, and voltage data; A control circuit is connected to the main control CPU and is used to control the mining fan.

2. The mining fan protection circuit according to claim 1, characterized in that: The reset circuit comprises: a first resistor, one end of which is connected to an external reset button; a first optocoupler connected to the other end of the first resistor; a second resistor, one end of the second resistor being connected to the first optical coupler, and the other end of the second resistor being connected to 3.3VD; A third resistor, one end of the third resistor is connected to the first optical coupler, and the other end of the third resistor is connected to the main control CPU circuit and is grounded through a first capacitor.

3. The mining fan protection circuit according to claim 1, characterized in that: The gas concentration collection circuit comprises: a fourth resistor connected to an external gas concentration detection sensor; a fifth resistor connected to an external gas concentration detection sensor; a second optical coupler connected to the other end of the fourth resistor, the other end of the fifth resistor, and 3.3VD; a second capacitor, one end of the second capacitor being connected to the other end of the fourth resistor and the other end of the fifth resistor; a sixth resistor, one end of the sixth resistor being connected to the second optical coupler and the other end being grounded; A seventh resistor, one end of the seventh resistor is connected to the second optical coupler, and the other end is connected to the main control CPU circuit.

4. The mining fan protection circuit according to claim 1, characterized in that: The expansion circuit comprises: A first multiplexer, wherein the first multiplexer is connected to the main control CPU circuit; A second multiplexer is connected to the main control CPU circuit.

5. The mining fan protection circuit according to claim 1, characterized in that: The acquisition circuit comprises: a temperature acquisition circuit connected to the expansion circuit; a current acquisition circuit, the current acquisition circuit being connected to the expansion circuit; The voltage acquisition circuit and the current acquisition circuit are connected to the expansion circuit.

6. The mining fan protection circuit according to claim 5, characterized in that: The temperature acquisition circuit consists of two circuits.

7. The mining fan protection circuit according to claim 6, characterized in that: Any of the temperature acquisition circuits includes: an eighth resistor, one end of the eighth resistor being connected to an external platinum thermal resistor, and the other end of the eighth resistor being connected to 3.3VD; a ninth resistor, one end of which is connected to the 3.3VD; a tenth resistor, one end of the tenth resistor being connected to the other end of the ninth resistor and the other end being grounded; an eleventh resistor, one end of the eleventh resistor being connected to an external platinum thermal resistor; an operational amplifier, wherein a non-inverting input terminal of the operational amplifier is connected to the other end of the eleventh resistor; a twelfth resistor, one end of the twelfth resistor being connected between the other end of the eleventh resistor and the non-inverting input terminal of the operational amplifier, and the other end being grounded; a thirteenth resistor, one end of the thirteenth resistor being connected between the other end of the ninth resistor and the other end of the tenth resistor, and the other end being connected to the inverting input terminal of the operational amplifier; a fourteenth resistor, one end of the fourteenth resistor being connected between the other end of the thirteenth resistor and the inverting input terminal of the operational amplifier, and the other end being connected to the output terminal of the operational amplifier; a fifteenth resistor, one end of the fifteenth resistor being connected to the output end of the operational amplifier, and the other end being connected to the main control CPU circuit; A third capacitor, one end of the third capacitor is connected to one end of the fifteenth resistor, and the other end is grounded.

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