CN112031873B - Coal mine area gas monitoring facilities - Google Patents
Coal mine area gas monitoring facilities Download PDFInfo
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- CN112031873B CN112031873B CN202010792450.4A CN202010792450A CN112031873B CN 112031873 B CN112031873 B CN 112031873B CN 202010792450 A CN202010792450 A CN 202010792450A CN 112031873 B CN112031873 B CN 112031873B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 93
- 239000003245 coal Substances 0.000 title claims abstract description 35
- 238000012545 processing Methods 0.000 claims abstract description 41
- 238000009423 ventilation Methods 0.000 claims abstract description 29
- 238000012806 monitoring device Methods 0.000 claims abstract description 22
- 238000004891 communication Methods 0.000 claims description 8
- 230000003993 interaction Effects 0.000 claims description 7
- 230000003071 parasitic effect Effects 0.000 claims description 4
- 230000002452 interceptive effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 7
- 238000005553 drilling Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
- 238000005065 mining Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
- F04D25/166—Combinations of two or more pumps ; Producing two or more separate gas flows using fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Geology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ventilation (AREA)
Abstract
The invention discloses a coal mine area gas monitoring device which comprises a gas monitoring host, wherein the gas monitoring host comprises a host processor, a wind speed sensor for monitoring wind speed information, a gas sensor for monitoring gas concentration information, a relay and a display screen; the wind speed sensor and the gas sensor are both electrically connected with the host processor and input monitored data information to the host processor for processing; the relay and the display screen are electrically connected with the host processor and controlled by the host processor; the host processor comprises a wind speed processing module, a gas processor module and a logic circuit; after the wind speed information processed by the wind speed processing module and the gas concentration information processed by the gas processing module are subjected to logic operation of the logic circuit, the working state of the relay is controlled through an output level signal of the logic circuit. The invention can carry out early warning and power-off of dangerous conditions of the coal mine area according to the ventilation environment.
Description
Technical Field
The invention belongs to the technical field of gas monitoring, and particularly relates to gas monitoring equipment in a coal mine area.
Background
The underground coal mine mining area is a section where gas disaster accidents frequently occur, along with continuous enhancement of underground coal mine mining strength and depth in recent years, high-risk accidents of mines are increased continuously, and how to early warn and monitor the high-risk accidents also becomes an important research direction in coal mine safety mining work. In the prior art, the ubiquitous phenomenon is that a device for monitoring the gas concentration is arranged at each fixed point, the gas concentration is monitored through the device, and the power of the electric equipment is timely cut off under the condition of higher gas concentration. However, this method is limited to monitoring the gas concentration, and in most cases, when the ventilation environment of the coal mine area is abnormal, even if the gas concentration is not too high, the gas concentration is rapidly increased due to unsmooth ventilation, and at this time, the monitoring device is powered off to the electricity utilization device, which has the risk of time lag and missing the optimal escape time.
As already disclosed patent [ patent application No.: 201410781626.0], which relates to a multi-parameter and multi-point monitoring device for coal mine gas disasters, comprising a gas pressure monitoring device, a drilling stress monitoring device, a gas concentration monitoring device, a plurality of monitoring substations, a monitoring substation and a ground terminal. The gas pressure monitoring device is arranged in a first drill hole of one side of the roadway, the drilling stress monitoring device is arranged in a second drill hole of the other side of the roadway, and the gas concentration monitoring device is suspended on a roadway roof; the gas pressure monitoring device monitors a gas pressure signal in real time and sends the gas pressure signal to the first monitoring substation; the drilling stress monitoring device monitors a drilling stress signal in real time and sends the drilling stress signal to a second monitoring substation; the gas concentration monitoring device monitors a gas concentration signal of the operation space in real time and sends the gas concentration signal to the third monitoring substation; the first, second and third monitoring substations respectively transmit the monitoring signals to the monitoring substation through the wireless communication technology, and the monitoring substation transmits all the monitoring signals to the ground terminal through optical fibers.
The above patent does not suggest how to warn about or power off depending on the ventilation environment.
Disclosure of Invention
The invention aims to solve the problems and provides coal mine area gas monitoring equipment capable of performing early warning and power off according to a ventilation environment.
The invention is realized by the following technical scheme: the invention provides a coal mine area gas monitoring device which comprises a gas monitoring host, wherein the gas monitoring host comprises a host processor, a wind speed sensor for monitoring wind speed information, a gas sensor for monitoring gas concentration information, a relay and a display screen; the wind speed sensor and the gas sensor are both electrically connected with the host processor and input monitored data information to the host processor for processing; the relay and the display screen are electrically connected with and controlled by the host processor; the relay controls the power-off/power-on state of each electric device in the coal mine area; the display screen displays air speed information and gas concentration information in the coal mine area; the host processor comprises a wind speed processing module, a gas processor module and a logic circuit; and after the wind speed information processed by the wind speed processing module and the gas concentration information processed by the gas processing module are subjected to logical operation of the logic circuit, the working state of the relay is controlled through an output level signal of the logic circuit.
Optionally, the system further comprises an aisle auxiliary fan, and the host processor further comprises a comparator and an RS485 serial communication interface; each aisle auxiliary fan is electrically connected with one gas monitoring host and controlled by the gas monitoring host to work; the two adjacent gas monitoring hosts carry out interaction of gas concentration information through the RS485 serial communication interface; after the gas concentration information of two interactive places is processed by the comparator in one gas monitoring host, a level signal is output to control the passage auxiliary fan electrically connected with the gas monitoring host to work.
Optionally, the gas monitoring host further comprises a wind speed warning lamp, a wind speed normal green lamp, a gas warning lamp and a gas normal green lamp; the wind speed processing module converts wind speed information with the wind speed not less than a first wind speed value into a level signal to control the normal green light of the wind speed to light up, converts wind speed information with the wind speed less than the first wind speed value and not less than a second wind speed value into a level signal to control the wind speed warning light to light up, and converts wind speed information with the wind speed less than the second wind speed value into a level signal to be input into the logic circuit to operate so as to control the relay to disconnect the power supply; the gas processing module converts gas concentration information of which the gas concentration is not greater than a first gas concentration value into a level signal to control the gas to light up normally, converts gas concentration information of which the gas concentration is greater than the first gas concentration value and is not greater than a second gas concentration value into a level signal to control the gas warning lamp to light up, and converts gas concentration information of which the gas concentration is greater than the second gas concentration value into a level signal to input into the logic circuit to operate so as to control the relay to disconnect the power supply.
Optionally, the gas monitoring host further comprises an alarm and a set-top auxiliary ventilation fan; the alarm and the set-top auxiliary ventilation fan are electrically connected with the host processor; the host processor further comprises a counter and a D flip-flop; the logic circuit comprises a first NAND gate circuit and a second NAND gate circuit; the input end of the counter is electrically connected with the gas processing module, the input end of the D trigger is electrically connected with the output end of the counter, and the level signal with the gas concentration being greater than the first gas concentration value and not greater than the second gas concentration value is output from the output of the D trigger; the level signal with the wind speed smaller than a second wind speed value and the level signal with the gas concentration larger than a second gas concentration value are input into two input ends of the first NAND gate circuit; the output end of the D trigger and the output end of the first NAND gate circuit are both input into two input ends of the second NAND gate circuit, and the output end of the second NAND gate circuit is electrically connected with the relay; and the output end of the first NAND gate circuit controls the alarm and the roof auxiliary ventilating fan to work.
Optionally, the comparator includes a subtractor and an N-channel MOS transistor switching circuit; the subtracter comprises two input ends for inputting gas concentration level signals; the N-channel MOS tube switching circuit comprises an N-channel MOS tube with a parasitic diode; the output end of the subtracter is electrically connected with the grid electrode of the N-channel MOS tube, the drain electrode of the N-channel MOS tube is electrically connected with a direct-current power supply, the passage auxiliary ventilation fan is electrically connected between the drain electrode and the direct-current power supply, and the source electrode of the N-channel MOS tube is grounded.
Optionally, the subtractor comprises an operational amplifier; the inverting input end of the operational amplifier is electrically connected with the first resistor, the non-inverting input end of the operational amplifier is electrically connected with the second resistor, the feedback resistor is electrically connected between the output end and the inverting input end, and the third resistor is electrically connected between the non-inverting input end and the ground.
Optionally, the gas monitoring host comprises a machine body, and the gas sensor and the wind speed sensor are both fixedly connected with the outer surface of the machine body; a display panel is fixedly connected to one side face of the machine body, and the wind speed normal green light, the wind speed warning light, the gas normal green light, the gas warning light, the alarm and the display screen are all arranged on the display panel and are fixedly connected with the display panel; one side surface of the machine body is fixedly connected with a plurality of relays; a baffle door which is rotatably connected with the machine body is arranged on one side face of the machine body, a processor cavity is arranged in the machine body, and the baffle door isolates the processor cavity from the external space; the host processor is arranged in the processor chamber; the top auxiliary ventilating fan is fixedly connected with the surface of the top of the machine body.
The invention has the beneficial effects that:
1. the coal mine area gas monitoring device is suitable for the ventilation channel of the coal mine area, and the arrangement of the coal mine area gas monitoring device in the embodiment at the ventilation channel can effectively ensure that power is cut off in time and each electric device is controlled to stop working under the condition of overhigh gas concentration or unsmooth ventilation. The invention can realize timely power-off if one of the ventilation and the gas concentration is abnormal, and does not need to carry out manual judgment or manual power-off.
2. The gas monitoring host provided by the invention is provided with the display screen, so that a worker can be assisted to know the gas concentration condition and the ventilation condition of the placement position of the gas monitoring host in time.
3. According to the invention, through the interaction of the gas concentration information between two adjacent gas monitoring hosts, once the gas concentration difference value is larger than a certain value, the passage auxiliary ventilation fan between the two gas monitoring hosts is opened to assist the air circulation in time, so that the potential safety hazard caused by the fact that the gas concentration difference value is larger and larger is avoided.
4. The gas monitoring host machine also carries the roof auxiliary ventilating fan, and is started to forcibly assist air flow in time when the current environment is abnormal.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of an external structure of a gas monitoring host according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an exemplary embodiment of a processor position within a gas monitoring host;
FIG. 3 is a schematic diagram of a control system of a gas monitoring device in a coal mine area according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a comparator according to an embodiment of the present invention;
FIG. 5 is a schematic view illustrating interaction of gas concentration information between two adjacent gas monitoring hosts according to an embodiment of the present invention;
100-a display panel; 110-a display screen; 121-wind speed normal green light; 122-wind speed warning light; 131-gas normal green light; 132-gas warning light; 140-an alarm; 150-a gas sensor; 160-wind speed sensor; 170-a relay; 180-a set-top auxiliary ventilation fan; 190-a stop gate; 200-a host processor; 400-a processor chamber; 300-body.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
In the description of the present invention, it is to be understood that the terms "left", "right", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one.
The invention discloses a coal mine area gas monitoring device which is used for an underground ventilation channel arranged in a coal mine area, and when the local gas concentration in the ventilation channel area is uneven, an auxiliary ventilation fan of a passageway can be started in time, so that the gas concentration of the ventilation channel is not over standard. The coal mine area gas monitoring equipment of the embodiment comprises gas monitoring hosts and corridor auxiliary ventilating fans, each corridor auxiliary ventilating fan corresponds to one gas monitoring host, the corresponding gas monitoring hosts control the operation, and the attached drawings 1 and 2 are schematic mechanical structure diagrams of the gas monitoring hosts of the embodiment.
As shown in fig. 3, the gas monitoring host includes a host processor 200, an air velocity sensor 160 for monitoring air velocity information, a gas sensor 150 for monitoring gas concentration information, a relay 170 and a display screen 110. The wind speed sensor 160 and the gas sensor 150 are electrically connected to the host processor 200 and input the monitored data information to the host processor 200 for processing. The relay 170 and the display screen 110 are electrically connected to the host processor 200 and controlled by the host processor 200. The relay 170 is used for controlling the power-off/power-on conditions of various electric devices in the coal mine area; the display screen 110 is used for displaying the air speed information and the gas concentration information in the coal mine area. The host processor 200 includes a wind speed processing module, a gas processor module, and logic circuitry. The wind speed information processed by the wind speed processing module and the gas concentration information processed by the gas processing module are subjected to logical operation of the logic circuit, and the working state of the relay 170 is controlled through an output level signal of the logic circuit. When the logic circuit outputs a high level, the contact of the relay 170 is disconnected, so that each controlled electric device stops running; when the logic circuit outputs low level, the relay 170 contacts to close, so that each controlled electric device operates normally.
Specifically, the coal mine area gas monitoring device of this embodiment further includes an aisle auxiliary fan, and the host processor 200 further includes a comparator and an RS485 serial communication interface. Each aisle auxiliary fan is electrically connected with a gas monitoring host and controlled by the gas monitoring host to work. Each gas monitoring host can monitor the gas concentration of the area where the gas monitoring host is placed, and the interaction of gas concentration information is carried out between two adjacent gas monitoring hosts through RS485 serial communication interfaces. After the gas concentration information of two interactive places is processed by a comparator in one gas monitoring host, a level signal is output to control the passage auxiliary fan electrically connected with the gas monitoring host to work. As shown in fig. 5, an aisle auxiliary fan is arranged between two gas monitoring hosts, and the two gas monitoring hosts perform interaction of gas concentration information through an RS485 serial communication interface; for convenience of description, the three gas monitoring hosts in the attached drawing 5 are named as a left gas monitoring host, a middle gas monitoring host and a right gas monitoring host; the gas concentration information interacted between the left gas monitoring host and the middle gas monitoring host is compared and processed by a comparator of the middle gas monitoring host; the gas concentration information interacted between the middle gas monitoring host and the right gas monitoring host is compared and processed by a comparator of the right gas monitoring host.
Specifically, the gas monitoring host further includes a wind speed warning lamp 122, a normal wind speed green lamp 121, a gas warning lamp 132, and a normal gas green lamp 131. The wind speed processing module converts wind speed information with wind speed not less than the first wind speed value into a level signal to control the light of the normal wind speed green light 121, converts wind speed information with wind speed less than the first wind speed value and not less than the second wind speed value into a level signal to control the light of the wind speed warning light 122, and converts wind speed information with wind speed less than the second wind speed value into a level signal to be input into the logic circuit to operate so as to control the relay 170 to be powered off. For convenience of illustration, as shown in fig. 3, the present embodiment divides the wind speed processing module into a first wind speed processing output F1, a second wind speed processing output F2 and a third wind speed processing output F3. After the wind speed signal is processed, a level signal with the wind speed not less than the first wind speed value is output from the first wind speed processing output end F1 to control the green light 121 with normal wind speed to light up so as to prompt that the current wind speed is normal; a level signal with the wind speed less than the first wind speed value and not less than the second wind speed value is output from the second wind speed processing output end F2 to control the wind speed warning light 122 to light up for warning that the current wind speed is small and the vigilance needs to be improved but is not dangerous; a level signal that the wind speed is less than the second wind speed value is output from the third wind speed processing output terminal F3 to be input to a logic circuit.
The gas processing module converts the gas concentration information of which the gas concentration is not greater than the first gas concentration value into a level signal to control the gas to be turned on normally by the green light 131, converts the gas concentration information of which the gas concentration is greater than the first gas concentration value and is not greater than the second gas concentration value into a level signal to control the gas warning light 132 to be turned on, and converts the gas concentration information of which the gas concentration is greater than the second gas concentration value into a level signal to be input into the logic circuit to be operated to control the relay 170 to be turned off. For convenience of illustration, as shown in fig. 3, the gas treatment module is divided into a first gas treatment output end W1, a second gas treatment output end W2 and a third gas treatment output end W3 in the present embodiment. After the gas concentration signal is processed, a level signal with the gas concentration not greater than the first gas concentration value is output from the first gas processing output end W1 to control the gas normal green light 131 to light up, so as to prompt that the current gas concentration is normal; a level signal with the gas concentration larger than the first gas concentration value and not larger than the second gas concentration value is output from the second gas processing output end W2 to control the gas warning lamp 132 to be on for warning that the current gas concentration is higher and the alarm needs to be raised but the danger is not caused; a level signal with the gas concentration larger than the second gas concentration value is output from the third gas processing output end W3 to be input to the logic circuit. The level signals output by the third wind speed processing output terminal F3 and the third gas processing output terminal W3 are input to two input terminals of the first nand gate circuit a 1.
Specifically, the gas monitoring host further includes an alarm 140 and a set-top auxiliary ventilating fan 180. Both the alarm 140 and the set-top auxiliary ventilation fan 180 are electrically connected to the host processor 200. Host processor 200 also includes a counter and a D flip-flop. The logic circuit includes a first nand gate a1 and a second nand gate a 2. The input end of the counter is electrically connected with the gas processing module, and specifically, the second gas processing output end W2 is electrically connected with the input end of the counter. The input end of the D trigger is electrically connected with the output end of the counter, and the level signal of which the gas concentration is greater than the first gas concentration value and not greater than the second gas concentration value is output from the output end of the D trigger. Namely, when the gas concentration in the environment is greater than the first gas concentration value and not greater than the second gas concentration value for a certain time, the relay 170 can be controlled to be powered off; after the level signal output from the second gas output end is counted down for a certain time period by the counter, the D trigger completes one-time output to control the relay 170 to be powered off.
Specifically, a level signal (a level signal output by the second wind speed output end) with the wind speed less than the second wind speed value and a level signal (a level signal output by the second gas output end) with the gas concentration greater than the second gas concentration value are input into two input ends of the first nand gate circuit a 1. The output end of the D flip-flop and the output end of the first nand gate circuit a1 are both input to two input ends of the second nand gate circuit a2, and the output end of the second nand gate circuit a2 is electrically connected to the relay 170. The output end of the first nand gate a1 controls the operation of the alarm 140 and the operation of the overhead auxiliary ventilating fan 180, that is, when the wind speed is lower than the third wind speed value or the gas concentration is higher than the third gas concentration value, there are both the sounding of the alarm 140 and the turning on of the overhead auxiliary ventilating fan 180 for accelerating the turning on flow, reducing the gas concentration, and prompting the working personnel of environmental danger. To sum up, when at least one of the second wind speed output end and the second gas output end has a high level, the output ends of the first NAND gate circuit A1 both output high levels; when at least one of the output terminal of the first nand gate a1 and the output terminal of the D flip-flop is high, the output terminal of the second nand gate a2 outputs high.
Specifically, the comparator comprises a subtracter and an N-channel MOS tube Q1 switching circuit; the subtracter comprises two input ends for inputting gas concentration level signals. The switch circuit of the N-channel MOS tube Q1 comprises an N-channel MOS tube Q1 with a parasitic diode D1, and the parasitic diode D1 has a protection function. The output end of the subtracter is electrically connected with the grid of an N-channel MOS tube Q1, a fifth resistor R5 is electrically connected between the grid of the N-channel MOS tube Q1 and the output end of the subtracter, the drain of the N-channel MOS tube Q1 is electrically connected with a direct-current power supply, an aisle auxiliary ventilating fan is electrically connected between the drain and the direct-current power supply, a fourth resistor R4 is electrically connected between the aisle auxiliary ventilating fan and the direct-current power supply, and the source of the N-channel MOS tube Q1 is grounded. The input end of the subtracter inputs level signals of gas concentration information measured by two adjacent different gas monitoring hosts, and the output end of the subtracter is the difference value of the two level signals. When the level of the output end of the subtracter is larger than a certain value, the switch circuit of the N-channel MOS tube Q1 is conducted, namely the N-channel MOS tube Q1 is conducted, and the amplified output voltage is provided at the drain electrode of the N-channel MOS tube Q1 so as to control the operation of the aisle auxiliary ventilation fan.
The type of the subtracter can be determined according to actual requirements, and is not limited to the embodiment, as shown in fig. 4, the embodiment only provides a basic subtracter circuit diagram, and the subtracter comprises an operational amplifier. The inverting input terminal of the operational amplifier is electrically connected to the first resistor R1, the non-inverting input terminal of the operational amplifier is electrically connected to the second resistor R2, the feedback resistor is electrically connected between the output terminal and the inverting input terminal, and the third resistor R3 is electrically connected between the non-inverting input terminal and the ground.
Fig. 1 and fig. 2 are mechanical schematic diagrams of a gas monitoring device in a coal mine area disclosed in this embodiment, and as shown in fig. 2, the gas monitoring host of this embodiment includes a machine body 300, and both the gas sensor 150 and the wind speed sensor 160 are fixedly connected to an outer surface of the machine body 300. One side of the body 300 is fixedly connected to the display panel 100, and the wind speed normal green light 121, the wind speed warning light 122, the gas normal green light 131, the gas warning light 132, the alarm 140 and the display screen 110 are all disposed on the display panel 100 and fixedly connected to the display panel 100. A plurality of relays 170 are fixedly connected to one side of the body 300. A shutter 190 rotatably connected to the body 300 is disposed at one side of the body 300, a processing chamber 400 is disposed inside the body 300, and the shutter 190 isolates the processing chamber 400 from an external space. The host processor 200 is disposed within the processor chamber 400. The set-top auxiliary ventilating fan 180 is fixedly connected with the top surface of the machine body 300.
In summary, the present embodiment has the following implementation functions in the table: for convenience of explanation, the condition that the wind speed is not less than the first wind speed value is a first wind condition, the condition that the wind speed is less than the first wind speed value and not less than the second wind speed value is a second wind condition, and the condition that the wind speed is less than the second wind speed value is a third wind condition; and making the condition that the gas concentration is not more than the first gas concentration value be a first gas condition, making the condition that the gas concentration is more than the first gas concentration value and not more than the second gas concentration value be a second gas condition, and making the condition that the gas concentration is more than the second gas concentration value be a third gas condition.
This embodiment is applicable to the ventilation passageway department in coal mine district, sets up the coal mine district gas monitoring equipment of this embodiment in ventilation passageway department and can effectively guarantee under the too high or not smooth condition of ventilation of gas concentration, in time cuts off the power supply, controls each consumer stop work. The gas monitoring host computer of this embodiment has display screen 110, can assist the staff in time to know the gas concentration condition and the ventilation condition that this gas monitoring host computer placed the position. This embodiment can realize when the abnormal conditions of ventilation and gas concentration two appear, in time fruit cuts off the power supply, and need not make artificial judgement or artifical power supply failure again. This embodiment makes in case the supplementary ventilating fan in passageway between two gas monitoring host computers is just opened when the gas concentration difference value appears and is greater than a definite value through the interaction of the gas concentration information between two adjacent gas monitoring host computers, in time assists the circulation of air, avoids appearing the gas concentration difference value and bigger and the potential safety hazard that brings. The gas monitoring host computer of this embodiment also carries the supplementary ventilating fan 180 of set-top itself, in time opens the air flow of forcing assistance when the environment is unusual at present.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made in the claims of the present invention should be covered by the claims of the present invention.
Claims (6)
1. The coal mine area gas monitoring equipment is characterized by comprising a gas monitoring host, wherein the gas monitoring host comprises a host processor (200), a wind speed sensor (160) for monitoring wind speed information, a gas sensor (150) for monitoring gas concentration information, a relay (170) and a display screen (110);
the wind speed sensor (160) and the gas sensor (150) are both electrically connected with the host processor (200) and input monitored data information to the host processor (200) for processing; the relay (170) and the display screen (110) are both electrically connected with the host processor (200) and controlled by the host processor (200); the relay (170) controls the power-off/power-on state of each electric device in the coal mine area; the display screen (110) displays wind speed information and gas concentration information in the coal mine area;
the host processor (200) comprises a wind speed processing module, a gas processing module and a logic circuit; after the wind speed information processed by the wind speed processing module and the gas concentration information processed by the gas processing module are subjected to logical operation of the logic circuit, the working state of the relay (170) is controlled through an output level signal of the logic circuit;
the system also comprises an aisle auxiliary fan, and the host processor (200) also comprises a comparator and an RS485 serial communication interface; each aisle auxiliary fan is electrically connected with one gas monitoring host and controlled by the gas monitoring host to work;
the two adjacent gas monitoring hosts carry out interaction of gas concentration information through the RS485 serial communication interface; after the gas concentration information of two interactive places is processed by the comparator in one of the gas monitoring host machines, an electrical level signal is output to control the passage auxiliary fan electrically connected with the gas monitoring host machine to work.
2. The coal mine area gas monitoring device according to claim 1, wherein the gas monitoring host further comprises a wind speed warning lamp (122), a wind speed normal green lamp (121), a gas warning lamp (132) and a gas normal green lamp (131);
the wind speed processing module converts wind speed information with a wind speed not less than a first wind speed value into a level signal to control the light of the wind speed normal green light (121), converts wind speed information with a wind speed less than the first wind speed value and not less than a second wind speed value into a level signal to control the light of the wind speed warning light (122), and converts wind speed information with a wind speed less than the second wind speed value into a level signal to be input into the logic circuit to operate so as to control the relay (170) to be powered off;
the gas processing module converts the gas concentration information of which the gas concentration is not greater than a first gas concentration value into a level signal to control the gas normal green light (131) to be turned on, converts the gas concentration information of which the gas concentration is greater than the first gas concentration value and is not greater than a second gas concentration value into a level signal to control the gas warning light (132) to be turned on, and converts the gas concentration information of which the gas concentration is greater than the second gas concentration value into a level signal to be input into the logic circuit to be operated so as to control the relay (170) to be turned off.
3. The coal mine gas monitoring apparatus of claim 2, wherein the gas monitoring host further comprises an alarm (140) and a set-top auxiliary ventilation fan (180); the alarm (140) and the set-top auxiliary ventilation fan (180) are both electrically connected with the host processor (200);
the host processor (200) further comprises a counter and a D flip-flop; the logic circuit comprises a first NAND gate circuit and a second NAND gate circuit; the input end of the counter is electrically connected with the gas processing module, the input end of the D trigger is electrically connected with the output end of the counter, and the level signal with the gas concentration being greater than the first gas concentration value and not greater than the second gas concentration value is output from the output of the D trigger;
the level signal with the wind speed smaller than a second wind speed value and the level signal with the gas concentration larger than a second gas concentration value are input into two input ends of the first NAND gate circuit; the output end of the D trigger and the output end of the first NAND gate circuit are both input into two input ends of the second NAND gate circuit, and the output end of the second NAND gate circuit is electrically connected with the relay (170);
the output end of the first NAND gate circuit controls the operation of the alarm (140) and the roof auxiliary ventilation fan (180).
4. The coal mine area gas monitoring device according to claim 3, wherein the comparator comprises a subtractor and an N-channel MOS tube switching circuit; the subtracter comprises two input ends for inputting gas concentration level signals;
the N-channel MOS tube switching circuit comprises an N-channel MOS tube with a parasitic diode; the output end of the subtracter is electrically connected with the grid electrode of the N-channel MOS tube, the drain electrode of the N-channel MOS tube is electrically connected with a direct-current power supply, the passage auxiliary fan is electrically connected between the drain electrode and the direct-current power supply, and the source electrode of the N-channel MOS tube is grounded.
5. The coal mine gas monitoring apparatus of claim 4,
the subtractor comprises an operational amplifier; the inverting input end of the operational amplifier is electrically connected with the first resistor, the non-inverting input end of the operational amplifier is electrically connected with the second resistor, the feedback resistor is electrically connected between the output end and the inverting input end, and the third resistor is electrically connected between the non-inverting input end and the ground.
6. The coal mine area gas monitoring device according to claim 5, wherein the gas monitoring host comprises a machine body (300), and the gas sensor (150) and the wind speed sensor (160) are fixedly connected with the outer surface of the machine body (300); a display panel (100) is fixedly connected to one side face of the machine body (300), and the wind speed normal green light (121), the wind speed warning light (122), the gas normal green light (131), the gas warning light (132), the alarm (140) and the display screen (110) are all arranged on the display panel (100) and are fixedly connected with the display panel (100); one side surface of the machine body (300) is fixedly connected with a plurality of relays (170); a shutter (190) rotatably connected with the machine body (300) is arranged on one side surface of the machine body (300), a processor chamber (400) is arranged in the machine body (300), and the shutter (190) isolates the processor chamber (400) from the external space; the host processor (200) is disposed within the processor chamber (400); the auxiliary ventilating fan (180) on the top of the machine body (300) is fixedly connected with the surface of the top of the machine body.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205330735U (en) * | 2016-01-26 | 2016-06-22 | 西京学院 | Mine is with intelligent wind -powered electricity generation gas blocking device |
| CN209510394U (en) * | 2018-12-29 | 2019-10-18 | 煤炭科学技术研究院有限公司 | A kind of getting working face coal and gas prominent real-time system for monitoring and pre-warning |
| CN111350546A (en) * | 2020-02-11 | 2020-06-30 | 安徽理工大学 | Coal mine gas monitoring system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205330735U (en) * | 2016-01-26 | 2016-06-22 | 西京学院 | Mine is with intelligent wind -powered electricity generation gas blocking device |
| CN209510394U (en) * | 2018-12-29 | 2019-10-18 | 煤炭科学技术研究院有限公司 | A kind of getting working face coal and gas prominent real-time system for monitoring and pre-warning |
| CN111350546A (en) * | 2020-02-11 | 2020-06-30 | 安徽理工大学 | Coal mine gas monitoring system |
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