Mining dust fall spraying controller
By designing a multi-layer protection circuit structure in the mining dust reduction spray controller, the problem that the equipment may generate electric sparks under overcurrent or overvoltage conditions is solved, and higher power safety and stability are achieved.
Patent Information
- Application Number
- CN202421641312.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-11
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-11
AI Technical Summary
Existing mining dust reduction spray controllers may generate electric sparks in overcurrent or overvoltage situations, resulting in safety accidents.
A mining dust-reduction spray controller is designed, adopting a multi-layer protection circuit structure, including a voltage-regulating power supply, an overcurrent protection circuit, an overvoltage protection circuit, a first spark protection circuit and a second spark protection circuit, through which electric sparks are avoided.
It effectively avoids the occurrence of electric sparks when the equipment fails, improves the safety and stability of electricity consumption, and ensures underground safety.
Smart Images
Figure CN222915656U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of intrinsically safe power supplies and relates to a dust suppression spray controller for mines. Background Art
[0002] The dust suppression spray system for mines can be arranged on the side walls of roadways and working faces. The dust suppression spray system for mines can include multiple controllers, and each controller corresponds to one or more groups of nozzles. For example, when sensors within a certain range detect that the particulate matter in the air is relatively high, the corresponding controller controls the valve to open, and one or more groups of nozzles spray water mist into the range to achieve dust suppression.
[0003] During underground operations, to ensure electrical safety, the controller is generally installed in a box made of cast iron or welded steel plates. However, there may be escaping gas in the box. When the concentration is too high, the electric spark generated due to a fault in the controller may cause a safety accident underground.
[0004] The controller adopts an intrinsically safe power supply, which controls in time when the intrinsically safe power supply is overcurrent or overvoltage, avoiding obvious electric sparks generated during the operation of the load. That is, the intrinsically safe power supply provides guarantee for the safe and reliable operation of the control valve, sensor and microprocessor of the controller.
[0005] In the current technology, the overcurrent protection circuit or overvoltage protection circuit may collect the current or voltage value in the main circuit. When the threshold is exceeded, the overcurrent protection circuit or overvoltage protection circuit disconnects the circuit. However, the action of the overcurrent protection circuit or overvoltage protection circuit often takes time, and sudden power-off of the sensor or microprocessor may cause electric sparks due to sudden changes in the voltage and current of the circuit, thus causing a safety accident. Summary of the Utility Model
[0006] To overcome the defects in the above-mentioned related technologies, the utility model provides a dust suppression spray controller for mines, which has safe and stable power consumption and can avoid the generation of electric sparks when the equipment fails.
[0007] To achieve the above technical purpose, the utility model provides a dust suppression spray controller for mines. The dust suppression spray controller for mines includes: a main power supply, a main circuit board and a secondary circuit board. The main circuit board is provided with a plurality of wiring terminals, each wiring terminal is electrically connected to the main power supply, and a plurality of fixed through holes are further provided on the main circuit board. The secondary circuit board is provided with through holes adapted to the corresponding fixed through holes, and the secondary circuit board is fixed to the main circuit board through the fixed through holes and the through holes. The secondary circuit board is provided with connection ends adapted to the wiring terminals, the connection ends are electrically connected to the corresponding wiring terminals, and the secondary circuit board is provided with an intrinsically safe power supply output circuit.
[0008] Among them, the intrinsically safe power supply output circuit includes: a regulated power supply, an overcurrent protection circuit, an overvoltage protection circuit, a first spark protection circuit, and a second spark protection circuit. The regulated power supply is electrically connected to the connection terminal. The overcurrent protection circuit is electrically connected to the positive pole of the regulated power supply. The overvoltage protection circuit is electrically connected to the overcurrent protection circuit. The first spark protection circuit is connected in parallel with the load, and the first spark protection circuit is configured to: detect the voltage at the input end of the load. When the voltage at the input end of the load exceeds the voltage threshold, the capacitor of the first spark protection circuit is connected in parallel with both ends of the load, and the output end of the load is electrically connected to the negative pole of the regulated power supply. The coil of the second spark protection circuit is connected in series between the overcurrent protection circuit and the load, and the second spark protection circuit is configured to: detect the current at one end of the coil electrically connected to the overcurrent protection circuit. When the current at one end of the coil electrically connected to the overcurrent protection circuit exceeds the current threshold, the shunt circuit connected in parallel with the load in the second spark protection circuit is turned on.
[0009] Preferably, the mine dust suppression spray controller includes: a microprocessor, an actuator, and a sensor. The intrinsically safe power supply output circuit includes: a first intrinsically safe power supply output circuit, a second intrinsically safe power supply output circuit, and a third intrinsically safe power supply output circuit. The load corresponding to the first intrinsically safe power supply output circuit is the microprocessor, the load corresponding to the second intrinsically safe power supply output circuit is the actuator, and the load corresponding to the third intrinsically safe power supply output circuit is the sensor.
[0010] Preferably, the first spark protection circuit includes: a first thyristor, a drive circuit, and a discharge circuit. The first thyristor is connected in series with the capacitor, and the series-connected first thyristor and the capacitor are connected in parallel with the load. One end of the drive circuit is electrically connected to the input end of the load, and the other end of the drive circuit is electrically connected to the control electrode of the first thyristor. The drive circuit is configured to detect the voltage at the input end of the load. When the voltage at the input end of the load exceeds the threshold voltage, the drive circuit controls the first thyristor to conduct. The discharge circuit is connected in parallel with both ends of the capacitor, and the discharge circuit is configured to: discharge the capacitor when the first thyristor is turned off.
[0011] Preferably, the drive circuit includes: an avalanche diode and a third resistor. The cathode of the avalanche diode is electrically connected to the input end of the load, the anode of the avalanche diode is connected in series with the third resistor, and the third resistor is electrically connected to the control electrode of the first thyristor.
[0012] Preferably, the discharge circuit includes a first resistor and a second resistor. The first resistor and the second resistor are connected in series. One end of the first resistor is electrically connected to the anode of the first thyristor. One end of the second resistor is electrically connected to one end of the capacitor. The connection end of the first resistor and the second resistor is also electrically connected to the connection end of the cathode of the first thyristor and the other end of the capacitor.
[0013] Preferably, the discharge circuit includes a zener diode, and the zener diode is connected in parallel across the two ends of the series-connected first resistor and second resistor.
[0014] Preferably, the second anti-spark protection circuit further includes a second thyristor. The control electrode of the second thyristor is connected to one end where the coil is electrically connected to the overcurrent protection circuit. The anode of the second thyristor is connected to the other end of the coil. The cathode of the second thyristor is electrically connected to the shunt circuit.
[0015] Preferably, the shunt circuit includes a shunt resistor. The cathode of the second thyristor is electrically connected to one end of the shunt resistor, and the other end of the shunt resistor is electrically connected to the output end of the load.
[0016] Preferably, the shunt circuit further includes a current-limiting resistor. One end of the current-limiting resistor is electrically connected to the anode of the second thyristor, and the other end of the current-limiting resistor is also electrically connected to the input end of the load.
[0017] Preferably, the shunt resistor and the second resistor share one resistor.
[0018] The beneficial effects of the present utility model are as follows:
[0019] The present utility model adopts multiple regulated power supplies, and the output voltage of the regulated power supply can be set according to the type of load. Moreover, when a failure occurs in an actuator or a microprocessor, etc., it will not form voltage or current interference to other loads.
[0020] The present utility model adopts a first anti-spark protection circuit. When it detects that the voltage at the input end of the load suddenly increases, it can conduct the circuit of the capacitor connected in parallel with the load, and the capacitor charges to reduce the voltage at the input end of the load, avoiding the generation of electric sparks in the load due to the sudden increase in voltage, and providing sufficient time for the operation of the overvoltage protection circuit, further improving the power supply safety of the intrinsically safe power supply.
[0021] The present utility model adopts a second anti-spark protection circuit and uses a coil, which can avoid the sudden change current from directly surging into the load. The coil provides sufficient reaction time for the second thyristor, enabling the shunt circuit to conduct and shunt the excessive current, ensuring the stability of the current passing through the load. Description of the Drawings
[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following will briefly introduce the drawings required for the description of the embodiments or related technologies. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0023] Figure 1 is the circuit structure diagram of the present invention;
[0024] Figure 2 is the circuit diagram of the intrinsically safe power supply output circuit of the present invention. Specific embodiments
[0025] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.
[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention 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, and therefore should not be construed as a limitation of the present invention.
[0027] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.
[0028] Such as Figure 1As shown in the figure, to achieve the above technical objectives, the present utility model provides a mine dust suppression spray controller. The mine dust suppression spray controller includes: a main power supply 4, a main circuit board, and a secondary circuit board. The main circuit board is provided with a plurality of wiring terminals, each wiring terminal is electrically connected to the main power supply, and a plurality of fixed through holes are also provided on the main circuit board. Through holes adapted to the corresponding fixed through holes are provided on the secondary circuit board, and the secondary circuit board is fixed to the main circuit board through the fixed through holes and the through holes. Connection terminals adapted to the wiring terminals are provided on the secondary circuit board, the connection terminals are electrically connected to the corresponding wiring terminals, and an intrinsically safe power supply output circuit is provided on the secondary circuit board.
[0029] The mine dust suppression spray controller includes a housing, which can be a box body welded by cast iron or steel plate. The main power supply can be a DC24V battery. The main circuit board is fixed inside the housing, and the wiring terminals on the main circuit board can be female header pins. There can be multiple secondary circuit boards. According to the number of nozzles, valves, and sensors deployed at different positions underground, the mine dust suppression spray controller of the present utility model can expand the secondary circuit boards according to requirements. Generally, one secondary circuit board corresponds to one electric valve.
[0030] The secondary circuit boards can be fixedly connected by screws or connecting rods. The secondary circuit board includes male header pins. A flexible connection line can also be provided between the male header pins and the secondary circuit board to facilitate the arrangement of multiple secondary circuit boards on the main circuit board, and the multiple male header pins and the secondary circuit boards will not interfere with each other. An intrinsically safe power supply output circuit is provided on each secondary circuit board.
[0031] Among them, the intrinsically safe power supply output circuit includes: a voltage stabilizing power supply 5, an overcurrent protection circuit 1, an overvoltage protection circuit 2, a first spark protection circuit, and a second spark protection circuit. The voltage stabilizing power supply is electrically connected to the connection terminal. The overcurrent protection circuit 1 is electrically connected to the positive pole of the voltage stabilizing power supply 5. The overvoltage protection circuit 2 is electrically connected to the overcurrent protection circuit 1. The first spark protection circuit is connected in parallel with the load, and the first spark protection circuit is configured to: detect the voltage at the input end of the load. When the voltage at the input end of the load exceeds the voltage threshold, the capacitor of the first spark protection circuit is connected in parallel with both ends of the load, and the output end of the load is electrically connected to the negative pole of the voltage stabilizing power supply. The coil of the second spark protection circuit is connected in series between the overcurrent protection circuit and the load, and the second spark protection circuit is configured to: detect the current at one end of the coil electrically connected to the overcurrent protection circuit 1. When the current at one end of the coil electrically connected to the overcurrent protection circuit 1 exceeds the current threshold, the shunt circuit connected in parallel with the load in the second spark protection circuit is turned on.
[0032] The voltage stabilizer 5 is a voltage stabilizing circuit integrated on the secondary circuit board. The voltage stabilizing circuit can design different output voltages according to the microprocessor, valves, and sensors. For example, the output voltages of the voltage stabilizer 5 can include DC3.3V, DC5V, or DC12V.
[0033] The voltage threshold can be set according to the rated voltage of the load. The voltage threshold is greater than or equal to the rated voltage of the load, and the voltage threshold should be lower than the voltage value at which the load may generate electric sparks. Similarly, the current threshold can be set according to the rated voltage of the load. The current threshold is greater than or equal to the rated current of the load, and the current threshold should be lower than the current value at which the load may generate electric sparks.
[0034] Preferably, the mine dust suppression spray controller includes: a microprocessor, an actuator, and a sensor. The intrinsically safe power supply output circuit 6 includes: a first intrinsically safe power supply output circuit 6, a second intrinsically safe power supply output circuit 6, and a third intrinsically safe power supply output circuit 6. The load 3 corresponding to the first intrinsically safe power supply output circuit 6 is the microprocessor, the load 3 corresponding to the second intrinsically safe power supply output circuit 6 is the actuator, and the load 3 corresponding to the third intrinsically safe power supply output circuit 6 is the sensor.
[0035] Preferably, as Figure 2 shown, the first anti-spark protection circuit includes: a first thyristor SCR1, a drive circuit, and a discharge circuit. The first thyristor SCR1 is connected in series with the capacitor C, and the series-connected first thyristor SCR1 and the capacitor C are connected in parallel with the load 3. One end of the drive circuit is electrically connected to the input end of the load 3, the other end of the drive circuit is electrically connected to the control electrode of the first thyristor SCR1, and the drive circuit is configured to detect the voltage at the input end of the load 3. When the voltage at the input end of the load 3 exceeds the threshold voltage, the drive circuit controls the first thyristor SCR1 to conduct. The discharge circuit is connected in parallel with both ends of the capacitor C, and the discharge circuit is configured to: when the first thyristor SCR1 is turned off, discharge the capacitor C.
[0036] Preferably, the drive circuit includes: an avalanche diode V and a third resistor R3. The cathode of the avalanche diode V is electrically connected to the input end of the load 3, the anode of the avalanche diode V is connected in series with the third resistor R3, and the third resistor R3 is electrically connected to the control electrode of the first thyristor SCR1.
[0037] Preferably, the discharge circuit includes a first resistor R1 and a second resistor R2. The first resistor R1 is connected in series with the second resistor R2. One end of the first resistor R1 is electrically connected to the anode of the first thyristor SCR1, and one end of the second resistor R2 is electrically connected to one end of the capacitor C. The connection end of the first resistor R1 and the second resistor R2 is also electrically connected to the connection end of the cathode of the first thyristor SCR1 and the other end of the capacitor C.
[0038] The resistance value of the first resistor R1 is relatively large, that is, the current passing through the resistor R1 and the resistor R2 is small and can be ignored.
[0039] Preferably, the discharge circuit includes a zener diode D, and the zener diode D is connected in parallel across the two ends of the series-connected first resistor R1 and second resistor R2.
[0040] Preferably, the second anti-spark protection circuit further includes a second thyristor SCR2. The control electrode of the second thyristor SCR2 is connected to one end where the coil and the over-current protection circuit 1 are electrically connected. The anode of the second thyristor SCR2 is connected to the other end of the coil, and the cathode of the second thyristor SCR2 is electrically connected to the shunt circuit.
[0041] A protection resistor can be connected in series on the line between the control electrode of the second thyristor SCR2 and the coil M. The protection resistor can prevent the second thyristor SCR2 from being damaged due to excessive current, or facilitate the selection of the second thyristor SCR2.
[0042] Preferably, the shunt circuit includes a shunt resistor. The cathode of the second thyristor SCR2 is electrically connected to one end of the shunt resistor, and the other end of the shunt resistor is electrically connected to the output end of the load 3.
[0043] Preferably, the shunt circuit further includes a current-limiting resistor R4. One end of the current-limiting resistor R4 is electrically connected to the anode of the second thyristor SCR2, and the other end of the current-limiting resistor R4 is also electrically connected to one end of the load 3.
[0044] Preferably, the shunt resistor and the second resistor R2 share one resistor.
[0045] The negative pole of the regulated power supply and the load output end are both electrically connected to the negative pole of the main power supply 4, and the negative pole of the main power supply 4 is grounded.
[0046] The specific operation process of the present invention is as follows:
[0047] As needed, multiple sub-circuit boards can be provided. For example, a first sub-circuit board, a second sub-circuit board, and a third sub-circuit board can be set. The load corresponding to the first sub-circuit board is a microprocessor, and the output voltage of the regulated power supply of the first sub-circuit board is 3.3V. The load corresponding to the second sub-circuit board is a particulate matter concentration detection sensor, and the output voltage of the regulated power supply of the second sub-circuit board is 5V. The load corresponding to the third sub-circuit board is an electric valve, and the output voltage of the regulated power supply of the third sub-circuit board is 12V. The first sub-circuit board, the second sub-circuit board, and the third sub-circuit board are fixed on the main circuit board, and the male pin is electrically connected to the female bus bar.
[0048] During operation, if there is a short circuit in Load 3, the current in the main circuit on the sub-circuit board suddenly increases. The overcurrent protection circuit 1 detects the sudden increase in the current in the main circuit and cuts off the main circuit. However, the current passing through Load 3 has already been too large in an instant. The mutated current is lagged through the coil M. At the same time, when the control electrode of the second thyristor SCR2 receives a current greater than the rated current of Load 3, it conducts, that is, the shunt circuit conducts. The mutated current passes through the coil M and then flows to the negative pole of the main power supply through the shunt circuit and Load 3. It can be understood that the resistance value of the shunt resistor R4 is small, that is, the current flowing to Load 3 is small, which can ensure the safety of Load 3 in an instant after a short circuit and avoid the generation of electric sparks due to excessive current.
[0049] When the voltage of the main circuit increases, the drive circuit detects that the voltage at the input end of Load 3 is higher than the rated voltage, that is, the avalanche diode V breaks down reversely. At this time, the first thyristor SCR1 conducts to charge the capacitor C, which can reduce the suddenly increased voltage across Load 3 or slow down the rising trend of the voltage across Load 3, and avoid the generation of electric sparks in Load 3 due to sudden voltage increase.
[0050] In addition, when the voltage of the circuit drops, the first thyristor SCR1 turns off, and the first resistor R1 and the second resistor R2 release the electric charge stored in the capacitor C, providing a prerequisite for subsequent stable operation.
[0051] In the description of this specification, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.
[0052] The above are only the specific implementation manners of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims
1. A dust suppression spray controller for mining, characterized in that: include: Main power supply A main circuit board, wherein the main circuit board is provided with a plurality of connection terminals, each of which is electrically connected to a main power supply, and the main circuit board is also provided with a plurality of fixing through holes; A secondary circuit board, wherein the secondary circuit board is provided with a through hole adapted to the corresponding fixing through hole, the secondary circuit board is fixed to the main circuit board through the fixing through hole and the through hole, the secondary circuit board is provided with a connecting end adapted to the wiring terminal, the connecting end is electrically connected to the corresponding wiring terminal, and the secondary circuit board is provided with an intrinsically safe power supply output circuit; Wherein, the intrinsically safe power supply output circuit comprises: A voltage-stabilized power supply, the voltage-stabilized power supply is electrically connected to the connection end; An overcurrent protection circuit, the overcurrent protection circuit is electrically connected to the positive electrode of the voltage-stabilized power supply; an overvoltage protection circuit, the overvoltage protection circuit being electrically connected to the overcurrent protection circuit; a first spark protection circuit, the first spark protection circuit is connected in parallel with the load, and the first spark protection circuit is configured to: detect the voltage at the input end of the load, when the voltage at the input end of the load exceeds a voltage threshold, the capacitor of the first spark protection circuit is connected in parallel with both ends of the load, and the output end of the load is electrically connected to the negative electrode of the voltage-stabilized power supply; A second anti-spark protection circuit, wherein the coil of the second anti-spark protection circuit is connected in series between the overcurrent protection circuit and the load, and the second anti-spark protection circuit is configured to detect the current at one end of the coil electrically connected to the overcurrent protection circuit, and when the current at one end of the coil electrically connected to the overcurrent protection circuit exceeds a current threshold, a shunt circuit in the second anti-spark protection circuit connected in parallel with the load is turned on.
2. The dust suppression spray controller for mining according to claim 1, characterized in that: The mine dust suppression spray controller comprises: a microprocessor, an actuator and a sensor; The intrinsically safe power supply output circuit includes: a first intrinsically safe power supply output circuit, a second intrinsically safe power supply output circuit and a third intrinsically safe power supply output circuit. The load corresponding to the first intrinsically safe power supply output circuit is a microprocessor, the load corresponding to the second intrinsically safe power supply output circuit is an actuator, and the load corresponding to the third intrinsically safe power supply output circuit is a sensor.
3. The dust suppression spray controller for mining according to claim 2, characterized in that: The first anti-spark protection circuit comprises: A first thyristor, wherein the first thyristor is connected in series with the capacitor, and the first thyristor and the capacitor connected in series are connected in parallel with the load; A drive circuit, one end of which is electrically connected to the load input end, and the other end of which is electrically connected to the control electrode of the first thyristor, wherein the drive circuit is configured to detect the voltage at the load input end, and control the first thyristor to conduct when the voltage at the load input end exceeds a threshold voltage; A discharge circuit is connected in parallel with two ends of the capacitor, and the discharge circuit is configured to discharge the capacitor when the first thyristor is turned off.
4. The dust suppression spray controller for mining according to claim 3, characterized in that: The driving circuit includes: an avalanche diode and a third resistor, wherein the cathode of the avalanche diode is electrically connected to the load input terminal, the anode of the avalanche diode is connected in series with the third resistor, and the third resistor is electrically connected to the control electrode of the first thyristor.
5. The dust suppression spray controller for mining according to claim 4, characterized in that: The discharge circuit includes: a first resistor and a second resistor, the first resistor and the second resistor are connected in series, one end of the first resistor is electrically connected to the anode of the first thyristor, one end of the second resistor is electrically connected to one end of the capacitor, and the connection end of the first resistor and the second resistor is also electrically connected to the connection end of the cathode of the first thyristor and the other end of the capacitor.
6. The dust suppression spray controller for mining according to claim 5, characterized in that: The discharge circuit includes a voltage-stabilizing diode, which is connected in parallel to two ends of a first resistor and a second resistor connected in series.
7. The dust suppression spray controller for mining according to any one of claims 1 to 6, characterized in that: The second anti-spark protection circuit also includes a second thyristor, the control electrode of the second thyristor is connected to one end electrically connected to the coil and the overcurrent protection circuit, the anode of the second thyristor is connected to the other end of the coil, and the cathode of the second thyristor is electrically connected to the shunt circuit.
8. The dust suppression spray controller for mining according to claim 7, characterized in that: The shunt circuit includes a shunt resistor, the cathode of the second thyristor is electrically connected to one end of the shunt resistor, and the other end of the shunt resistor is electrically connected to the output end of the load.
9. The dust suppression spray controller for mining according to claim 8, characterized in that: The shunt circuit also includes a current limiting resistor, one end of which is electrically connected to the anode of the second thyristor, and the other end of which is also electrically connected to the load input terminal.
10. The dust suppression spray controller for mining according to claim 8, characterized in that: The discharge circuit includes a second resistor; The shunt resistor and the second resistor share a resistor.