Intrinsic safety type sound-light alarm control circuit for coal mine tunnel

Abstract

The utility model provides a kind of intrinsic safety type sound-light alarm control circuit for coal mine tunnel, it is related to coal mine tunnel safety technical field, including a multiple-input logic gate chip, the multiple-input logic gate chip is connected with several trigger signal switches;When any described trigger signal switch is connected, the multiple-input logic gate chip outputs high level signal, high level signal synchronous control luminous drive circuit and voice playing circuit;Voice playing circuit includes voice chip, high level signal is used to control the voice chip, technical effect: each trigger signal switch corresponds a logic output, the logic output controls the pin of corresponding voice chip, and then the voice corresponding to the voice chip is played in advance, meanwhile, any trigger signal switch makes multiple-input logic gate chip output a high level, the high level makes first NPN triode conduct, and then start self-oscillator circuit, emit flashing red light, realize sound-light alarm output for multiple audio.

Description

Technical Field

[0001] This utility model relates to the field of coal mine roadway safety technology, and in particular to an intrinsically safe sound and light alarm control circuit for coal mine roadways. Background Technology

[0002] Intrinsically safe audible and visual alarms are needed at various locations in coal mine roadways, including fully mechanized mining faces, tunneling faces, winch transport roadways, cable car transport roadways, belt conveyor transport roadways, roadway ventilation doors, and locomotive bends in horizontal roadways, to serve as safety warning signals. Various alarm requirements exist within the roadways, and the alarm content varies. Developing an audible and visual alarm that can adapt to multiple audio frequencies is one of the technical problems that needs to be solved.

[0003] Therefore, it is necessary to develop an intrinsically safe audible and visual alarm control circuit for coal mine roadways to overcome the aforementioned technical problems. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the purpose of this utility model is to disclose an intrinsically safe sound and light alarm control circuit for coal mine roadways.

[0005] To achieve the above-mentioned objectives, this invention provides an intrinsically safe audible and visual alarm control circuit for use in coal mine roadways.

[0006] It includes a multi-input logic gate chip, which is connected to several trigger signal switches;

[0007] When any of the trigger signal switches is turned on, the multi-input logic gate chip outputs a high-level signal, and the high-level signal synchronously controls the light-emitting driving circuit and the voice playback circuit.

[0008] The light-emitting driving circuit includes a signal receiving terminal, a first NPN transistor and a first PNP transistor. The signal receiving terminal is connected to the base of the first NPN transistor and the signal receiving terminal is connected to the base of the first PNP transistor.

[0009] The first NPN transistor provides power to the self-excited multivibrator circuit;

[0010] The first PNP transistor provides power to the green LED circuit;

[0011] The voice playback circuit includes a voice chip, and the high-level signal is used to control the voice chip.

[0012] Preferably, the multi-input logic gate chip is a CD4068 chip;

[0013] The number of trigger signal switches is eight.

[0014] Preferably, the eight trigger signal switches are respectively connected to the corresponding pins of the CD4068 chip.

[0015] Preferably, when none of the eight trigger signal switches are triggered, the CD4068 chip outputs a low level;

[0016] The low-level signal drives the first PNP transistor to conduct and turns off the first NPN transistor, thus activating the green LED circuit.

[0017] Preferably, when any of the trigger signal switches is turned on, the CD4068 chip outputs a high level;

[0018] The high-level signal drives the first NPN transistor to conduct and turns off the first PNP transistor, thus activating the self-excited multivibrator circuit.

[0019] Preferably, the self-excited multivibrator circuit includes a light-emitting diode, a first capacitor, a second capacitor, a second NPN transistor, a third NPN transistor, and a second PNP transistor.

[0020] Preferably, the positive terminal of the light-emitting diode is connected to the emitter of the first NPN transistor through a first resistor, the negative terminal of the light-emitting diode is connected to the collector of the second NPN transistor and the positive terminal of the second capacitor, and the negative terminal of the second capacitor is connected to the base of the third NPN transistor.

[0021] Preferably, the base of the second NPN transistor is connected to the emitter of the first NPN transistor through a second resistor, the base of the second NPN transistor is connected to the negative terminal of the first capacitor, the emitter of the second NPN transistor is grounded, and the positive terminal of the first capacitor is connected to the collector of the third NPN transistor.

[0022] Preferably, the base of the third NPN transistor is connected to the emitter of the first NPN transistor through a third resistor, the emitter of the third NPN transistor is grounded, and the collector of the third NPN transistor is connected to the emitter of the first NPN transistor through a fourth resistor.

[0023] Preferably, the base of the second PNP transistor is connected to the collector of the third NPN transistor, the collector of the second PNP transistor is grounded, and the emitter of the second PNP transistor is connected to the emitter of the first NPN transistor via a relay.

[0024] Compared with the prior art, the technical effects of this utility model are as follows:

[0025] This invention relates to a multi-input logic gate chip connected to several trigger signal switches. Each trigger signal switch corresponds to a logic output, which controls the pin of the corresponding voice chip, thereby playing the corresponding pre-stored voice in the voice chip. At the same time, any trigger signal switch causes the multi-input logic gate chip to output a high level, which turns on the first NPN transistor, thereby activating the self-excited multivibrator circuit and emitting a flashing red light to realize an audible and visual alarm for multiple audio channels. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the multi-input logic gate chip and several trigger signal switches of this utility model.

[0028] Figure 2 This is the circuit schematic of the self-excited multivibrator of this utility model.

[0029] Figure 3 This is a schematic diagram of the voice chip of this utility model.

[0030] Figure 4 This is the schematic diagram of the front audio amplifier circuit of this utility model.

[0031] Figure 5 This is the schematic diagram of the rear audio amplifier circuit of this utility model.

[0032] Figure 6 This is a schematic diagram showing the pin correspondence between the voice chip and the CD4068 chip of this utility model.

[0033] Figure 7 This is the circuit diagram of the red light-emitting diode of this utility model.

[0034] Figure 8 This is a circuit diagram of a green light-emitting diode of this utility model. Detailed Implementation

[0035] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent transformations or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the protection scope of the present invention.

[0036] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0037] Embodiment 1

[0038] Refer Figures 1 to 5 As shown, this embodiment discloses a specific implementation of an intrinsically safe sound and light alarm control circuit for coal mine roadways.

[0039] Refer to Figures 1 to 5 As shown, the intrinsically safe sound and light alarm control circuit for coal mine roadways includes a multi-input logic gate chip, and the multi-input logic gate chip is connected to several trigger signal switches; when any one of the trigger signal switches is turned on, the multi-input logic gate chip outputs a high-level signal, and the high-level signal synchronously controls the light-emitting drive circuit and the voice playback circuit; the light-emitting drive circuit includes a signal receiving end CONLED, a first NPN-type triode Q3 and a first PNP-type triode Q4. The signal receiving end CONLED is connected to the base of the first NPN-type triode Q3, and the signal receiving end CONLED is connected to the base of the first PNP-type triode Q4; the first NPN-type triode Q3 provides power for the self-excited multivibrator circuit; the first PNP-type triode Q4 provides power for the green light-emitting diode circuit; the voice playback circuit includes a voice chip U4, and the voice chip U4 is preferably CH9300, and the high-level signal is used to control the voice chip U4.

[0040] Specifically, refer to Figures 1 to 5 , the multi-input logic gate chip is a CD4068 chip. The CD4068 chip has eight pins, that is, it has eight input NAND gates. The number of the trigger signal switches is eight, which are trigger signal switch P1, trigger signal switch P2, trigger signal switch P3, trigger signal switch P4, trigger signal switch P5, trigger signal switch P6, trigger signal switch P7, and trigger signal switch P8 respectively. The eight trigger signal switches are respectively connected to the corresponding pins of the CD4068 chip, and each trigger signal switch corresponds to an input pin of the CD4068 chip. For example, trigger signal switch P1 corresponds to pin 2 of the CD4068 chip. The specific corresponding relationship is shown in Figure 1 .

[0041] See Figures 1 to 5 When all eight trigger signal switches are not triggered, i.e., when P1-P8 are all open, the CD4068 chip outputs a low level, and the signal receiving terminal CONLED is at a low level. This low level drives the first PNP transistor Q4 to conduct and turns off the first NPN transistor Q3. The 5V power supply powers the green LED circuit through the conducting first PNP transistor Q4, and the green LED circuit operates. (See the green LED circuit diagram.) Figure 8 If none of P1-P8 are triggered, the green light remains constantly on.

[0042] See Figures 1 to 5 When any of the aforementioned trigger signal switches is turned on, the CD4068 chip outputs a high level, the signal receiving terminal CONLED is at a high level, the high level drives the first NPN transistor Q3 to conduct and the first PNP transistor Q4 to turn off, the self-excited multivibrator circuit operates, the LED D9 in the self-excited multivibrator circuit flashes, and simultaneously drives... Figure 7 The red LED circuit shown is operational, triggering an alarm by flashing the red LED; simultaneously, the trigger signal from the trigger signal switch causes the voice chip U4 to play the corresponding pre-stored audio. See also Figure 1 , Figure 3 and Figure 6 Pins 2-5 of the CD4068 chip correspond to IO01-IO04 of the voice chip U4, respectively, and pins 9-12 of the CD4068 chip correspond to IO05-IO08 of the voice chip U4, respectively. The voice chip U4 has pre-stored audio; see details below. Figure 6 The audio files corresponding to IO01-IO08 are named 00001.mp3-00008.mp3. With one trigger signal switch corresponding to one pin of the voice chip U4, eight different audio alarms can be emitted. Pins 15 and 16 of the voice chip U4 are the two ports of the speaker. The voice chip U4 emits audio signals and... Figure 4 The front audio amplifier circuit shown and Figure 5 The sound alarm is emitted through a speaker after the rear audio amplifier circuit shown.

[0043] See Figure 2The self-excited multivibrator circuit works as follows: The self-excited multivibrator circuit includes a light-emitting diode (LED) D9, a first capacitor C2, a second capacitor C3, a second NPN transistor Q1, a third NPN transistor Q2, and a second PNP transistor Q5. The positive terminal of the LED is connected to the emitter of the first NPN transistor Q3 through a first resistor. The negative terminal of the LED D9 is connected to the collector of the second NPN transistor Q1 and the positive terminal of the second capacitor C3. The negative terminal of the second capacitor C3 is connected to the base of the third NPN transistor Q2. The base of the second NPN transistor Q1 is connected to the emitter of the first NPN transistor Q3 through a second resistor R2. The base of the second NPN transistor Q1 is connected to the first capacitor C2. The negative terminal of capacitor C2 is connected to the emitter of the second NPN transistor Q1, which is grounded. The positive terminal of capacitor C2 is connected to the collector of the third NPN transistor Q2. The base of the third NPN transistor Q2 is connected to the emitter of the first NPN transistor Q3 through a third resistor R4. The emitter of the third NPN transistor Q2 is grounded. The collector of the third NPN transistor Q2 is connected to the emitter of the first NPN transistor Q3 through a fourth resistor R22. The base of the second PNP transistor Q5 is connected to the collector of the third NPN transistor Q2. The collector of the second PNP transistor Q5 is grounded. The emitter of the second PNP transistor Q5 is connected to the emitter of the first NPN transistor Q3 through a relay K1.

[0044] When CONLED is high, the base of the first NPN transistor Q3 is high, and Q3 is turned on. The power supply, close to 5V, powers the self-oscillating multivibrator circuit. Since the second NPN transistors Q1 and Q2 cannot be identical, one of them will always turn on first. For example, if Q1 turns on first, its collector voltage is close to 0, and the second capacitor C3 is effectively short-circuited. The base voltage of the third NPN transistor Q2, connected to the second capacitor C3, is... When the voltage approaches 0, the third NPN transistor Q2 is cut off; after the second NPN transistor Q1 turns on, current flows through the LED D9 connected to the collector of the second NPN transistor Q1, and it begins to light up. At this time, the second capacitor C3 begins to charge, and the voltage on the right side of the second capacitor C3 continuously increases. When the voltage of the second capacitor C3 is higher than the conduction voltage of the third NPN transistor Q2, the third NPN transistor Q2 turns on. The base of the second PNP transistor Q5 goes low, the second PNP transistor Q5 turns on, the relay K1 is energized, the normally open contact closes, and the 12V power supply on the circuit board is supplied. Figure 7The red LED circuit shown is powered; the second PNP transistor Q5 continuously turns on and off, causing the red LED to flash. At this time, the base voltage of the second NPN transistor Q1 approaches 0 due to the influence of the first capacitor C2, causing Q1 to turn off and LED D9 to stop emitting light. Then, the first capacitor C2 begins to charge, and the second capacitor C3 discharges. When the first capacitor C2 charges to a certain level, the base voltage of the second NPN transistor Q1 becomes higher than its on-state voltage, causing Q1 to turn on again and Q2 to turn off again. This process repeats, and the two LED circuits flash alternately. By changing the values ​​of resistors R2 and R4, and by changing the values ​​of the first capacitor C2 and the second capacitor C3, the oscillation frequency of the self-excited multivibrator circuit is changed, thus adjusting the LED flashing frequency.

Claims

1. A control circuit for an intrinsically safe audible and visual alarm used in coal mine roadways, characterized in that, It includes a multi-input logic gate chip, which is connected to several trigger signal switches; When any of the trigger signal switches is turned on, the multi-input logic gate chip outputs a high-level signal, and the high-level signal synchronously controls the light-emitting driving circuit and the voice playback circuit. The light-emitting driving circuit includes a signal receiving terminal, a first NPN transistor and a first PNP transistor. The signal receiving terminal is connected to the base of the first NPN transistor and the signal receiving terminal is connected to the base of the first PNP transistor. The first NPN transistor provides power to the self-excited multivibrator circuit; The first PNP transistor provides power to the green LED circuit; The voice playback circuit includes a voice chip, and the high-level signal is used to control the voice chip.

2. The intrinsically safe audible and visual alarm control circuit for coal mine roadways as described in claim 1, characterized in that, The multi-input logic gate chip is a CD4068 chip; The number of trigger signal switches is eight.

3. The intrinsically safe audible and visual alarm control circuit for coal mine roadways as described in claim 2, characterized in that, The eight trigger signal switches are respectively connected to the corresponding pins of the CD4068 chip.

4. The intrinsically safe audible and visual alarm control circuit for coal mine roadways as described in claim 3, characterized in that, When none of the eight trigger signal switches are triggered, the CD4068 chip outputs a low level; The low-level signal drives the first PNP transistor to conduct and turns off the first NPN transistor, thus activating the green LED circuit.

5. The intrinsically safe audible and visual alarm control circuit for coal mine roadways as described in claim 3, characterized in that, When any of the trigger signal switches is turned on, the CD4068 chip outputs a high level; The high-level signal drives the first NPN transistor to conduct and turns off the first PNP transistor, thus activating the self-excited multivibrator circuit.

6. The intrinsically safe audible and visual alarm control circuit for coal mine roadways as described in claim 3, characterized in that, The self-excited multivibrator circuit includes a light-emitting diode, a first capacitor, a second capacitor, a second NPN transistor, a third NPN transistor, and a second PNP transistor.

7. The intrinsically safe audible and visual alarm control circuit for coal mine roadways as described in claim 6, characterized in that, The positive terminal of the light-emitting diode is connected to the emitter of the first NPN transistor through a first resistor, the negative terminal of the light-emitting diode is connected to the collector of the second NPN transistor and the positive terminal of the second capacitor, and the negative terminal of the second capacitor is connected to the base of the third NPN transistor.

8. The intrinsically safe audible and visual alarm control circuit for coal mine roadways as described in claim 7, characterized in that, The base of the second NPN transistor is connected to the emitter of the first NPN transistor through a second resistor. The base of the second NPN transistor is connected to the negative terminal of the first capacitor. The emitter of the second NPN transistor is grounded. The positive terminal of the first capacitor is connected to the collector of the third NPN transistor.

9. The intrinsically safe audible and visual alarm control circuit for coal mine roadways as described in claim 8, characterized in that, The base of the third NPN transistor is connected to the emitter of the first NPN transistor through a third resistor. The emitter of the third NPN transistor is grounded. The collector of the third NPN transistor is connected to the emitter of the first NPN transistor through a fourth resistor.

10. The intrinsically safe audible and visual alarm control circuit for coal mine roadways as described in claim 9, characterized in that, The base of the second PNP transistor is connected to the collector of the third NPN transistor, the collector of the second PNP transistor is grounded, and the emitter of the second PNP transistor is connected to the emitter of the first NPN transistor through a relay.

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