CN110856300A - Explosion-proof mining intelligent food heating device - Google Patents
Explosion-proof mining intelligent food heating device Download PDFInfo
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- CN110856300A CN110856300A CN201910995640.3A CN201910995640A CN110856300A CN 110856300 A CN110856300 A CN 110856300A CN 201910995640 A CN201910995640 A CN 201910995640A CN 110856300 A CN110856300 A CN 110856300A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/66—Circuits
- H05B6/68—Circuits for monitoring or control
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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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- Control Of High-Frequency Heating Circuits (AREA)
Abstract
The embodiment of the invention discloses an explosion-proof mining intelligent food heating device, which comprises: the microwave heating module is used for carrying out microwave heating; the gas concentration acquisition module is used for acquiring the gas concentration near the intelligent food heating device for the explosion-proof mine; and the control module is used for controlling the explosion-proof mining intelligent food heating device to be powered off when the gas concentration exceeds a preset gas concentration threshold value. According to the invention, through monitoring the environment, the heating device can be effectively prevented from exploding, and the safety of heating and dining by workers is ensured.
Description
Technical Field
The embodiment of the invention relates to the technical field of underground heating equipment, in particular to an explosion-proof mining intelligent food heating device.
Background
Currently, downhole personnel need to heat the food with a special heating device before eating the food to ensure the health of the downhole personnel.
Currently, the heating devices for the target coal mine include eddy current heating devices. The eddy heating device comprises a heating pot and a heating coil, the heating pot is heated by the heating coil through eddy current, induction current is generated on the heating pot, and heat is generated through the resistance of the pot body. When the target eddy current heating device is easy to explode, the damage rate of the device is high.
Disclosure of Invention
Therefore, the embodiment of the invention provides an explosion-proof intelligent food heating device for a mine, and aims to solve the problems that a heating device under a coal mine is easy to explode and the damage rate of devices is high in the prior art.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
the embodiment of the invention discloses an explosion-proof mining intelligent food heating device, which comprises: the microwave heating module is used for carrying out microwave heating; the gas concentration acquisition module is used for acquiring the gas concentration near the intelligent food heating device for the explosion-proof mine; and the control module is used for controlling the explosion-proof mining intelligent food heating device to be powered off when the gas concentration exceeds a preset gas concentration threshold value.
Further, still include: the temperature and humidity information acquisition module is used for acquiring the temperature and the humidity near the intelligent food heating device for the explosion-proof mine; the control module is also used for controlling the explosion-proof mining intelligent food heating device to be powered off when the temperature exceeds a preset temperature threshold value or the humidity exceeds a preset temperature threshold value.
Further, still include: and the communication module is used for uploading the equipment working information of the intelligent food heating device for the explosion-proof mine to a ground monitoring terminal in real time.
Further, the microwave heating module includes: the power interface is used for connecting an external power supply; the full-bridge filtering and rectifying module is used for performing full-bridge filtering and rectifying on the voltage provided by the external power supply to obtain direct-current voltage; the full-bridge conversion module and the transformation module are used for processing the direct-current voltage to obtain a first alternating-current voltage circuit and a second alternating-current voltage circuit; the cathode of the magnetron is respectively connected with the first alternating voltage circuit and the second alternating voltage circuit; the voltage sampling module is connected with the magnetron and is also used for collecting the voltage of the magnetron; and the frequency conversion control circuit is connected with the power interface, the full-bridge conversion module and the voltage sampling module and is used for controlling the full-bridge conversion module according to the voltage of the magnetron so as to realize frequency conversion regulation.
Further, first alternating voltage circuit provides 4400V alternating voltage, the second alternating voltage circuit provides 3.3V alternating voltage, first alternating voltage circuit is used for connecting the first end of magnetron cathode, the second alternating voltage circuit is used for connecting the first end and the second end of magnetron cathode.
Further, the first alternating current voltage circuit includes: and the voltage doubling circuit is connected between the voltage transformation module and the first end of the magnetron cathode and is used for performing voltage doubling transformation.
Further, an optical coupling isolation module is further arranged between the voltage acquisition module and the variable frequency control circuit.
Further, still include: and the display module is connected with the control module and used for displaying the working state information of the intelligent food heating device for the explosion-proof mine.
Further, the display module is an explosion-proof display.
Further, still include: and the keyboard input module is connected with the variable frequency control circuit and is used for inputting power and time information to the variable frequency control circuit so that the variable frequency control circuit can control the working state parameters of the magnetron according to the input power and time information.
The invention has the following advantages:
the explosion-proof mining intelligent food heating device provided by the embodiment of the invention can monitor the surrounding gas concentration, and control the heating device to be powered off when the gas concentration exceeds the limit, so that the heating device is effectively prevented from exploding. In addition, a temperature and humidity sensor is arranged to acquire temperature and humidity information of the heating device, and the heating device is controlled to be powered off when the temperature is too high or the humidity is too high, so that the heating device is further prevented from exploding. Heating device sends operating condition information for ground monitoring center, makes things convenient for the staff of people to carry out real time monitoring to heating device's operating condition in the ground control, and when heating device was in dangerous state, the staff can inform the personnel in the pit to close heating device, can promote heating device's security, guarantees the security that the staff heating was eaten simultaneously. The microwave power supply adopted by the heating device adopts a phase-shift control full-bridge conversion technology, so that the design difficulty can be effectively reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope covered by the contents disclosed in the present invention.
Fig. 1 is a block diagram of an explosion-proof mining intelligent food heating device according to an embodiment of the invention;
FIG. 2 is a block diagram of a circuit structure of the explosion-proof mining intelligent food heating device according to the embodiment of the invention;
FIG. 3 is a circuit diagram between the change module and the magnetron in an embodiment of the invention;
FIG. 4 is a block diagram of a control circuit of a single chip microcomputer according to an embodiment of the present invention;
fig. 5 is a block diagram of a microwave power circuit according to an embodiment of the present invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Fig. 1 is a block diagram of an explosion-proof mining intelligent food heating device according to an embodiment of the invention. As shown in fig. 1, the explosion-proof mining intelligent food heating device according to the embodiment of the present invention includes: the device comprises a microwave heating module, a gas concentration acquisition module and a control module. Wherein, the microwave heating module is used for heating the food which is heated in the underground zone. The gas concentration acquisition module is used for acquiring the gas concentration near the intelligent food heating device for the explosion-proof mine. The control module is used for controlling the explosion-proof mining intelligent food heating device to be powered off when the gas concentration exceeds a preset gas concentration threshold value.
In particular, the concentration of gas may exceed the standard due to the underground operation, and the gas explosion is easily caused by the heat generated when the heating device is operated or the current generated by the electronic component. According to the invention, the gas concentration is monitored, and when the gas concentration exceeds the gas threshold value for marking the gas safety concentration, the heating device is controlled to be powered off, so that the heating device can be effectively prevented from explosion, and the safety of heating and dining by workers can be further ensured.
In one embodiment of the invention, the intelligent food heating device for the explosion-proof mine further comprises a display module, and the display module is connected with the control module and is used for displaying the working state information of the intelligent food heating device for the explosion-proof mine. Furthermore, the display module is an explosion-proof display, so that personal injury accidents caused by display explosion can be effectively avoided, and equipment damage can be avoided.
In one embodiment of the invention, the microwave heating module comprises a power interface, a full-bridge filtering rectification module, a full-bridge conversion module, a voltage transformation module, a magnetron and a variable frequency control circuit.
Wherein, the power interface is used for connecting an external power supply.
And the full-bridge filtering and rectifying module is used for carrying out full-bridge filtering and rectifying on the voltage provided by the external power supply to obtain direct-current voltage.
The full-bridge conversion module and the transformation module are used for processing the direct-current voltage to obtain a circuit with a first alternating-current voltage circuit and a second alternating-current voltage circuit.
The cathode of the magnetron is respectively connected with the first alternating voltage circuit and the second alternating voltage circuit; and the voltage sampling module is connected with the magnetron and is also used for collecting the voltage of the magnetron.
And the frequency conversion control circuit is connected with the power interface, the full-bridge conversion module and the voltage sampling module and is used for controlling the full-bridge conversion module according to the voltage of the magnetron so as to realize frequency conversion regulation.
Further, a first ac voltage circuit provides 4400V ac voltage, a second ac voltage circuit provides 3.3V ac voltage, the first ac voltage circuit is configured to connect to the first terminal of the cathode of the magnetron, and the second ac voltage circuit is configured to connect to the first terminal and the second terminal of the cathode of the magnetron.
Further, the first alternating current voltage circuit includes: and the voltage doubling circuit is connected between the voltage transformation module and the first end of the cathode of the magnetron and is used for performing voltage doubling transformation.
Further, an optical coupling isolation module is further arranged between the voltage acquisition module and the variable frequency control circuit.
Fig. 2 is a circuit structure block diagram of the explosion-proof mining intelligent food heating device according to the embodiment of the invention. As shown in fig. 2, one path of the mine power supply (for example, 127V) is connected to the microwave power supply, and the other path is connected to the control circuit of the singlechip.
FIG. 3 is a circuit diagram between the change module and the magnetron in the embodiment of the invention. As shown in fig. 3, one path connected to the microwave power supply: the 127V voltage is rectified and filtered by the full-bridge filtering and rectifying module to obtain about 170V direct current voltage, the 170V direct current voltage is subjected to the full-bridge inverter circuit and the high-frequency transformer to obtain two paths of high-frequency alternating current voltages (about 2200V and 3.3V), wherein the 2200V voltage is subjected to the voltage doubling circuit to obtain about 4400V direct current high voltage, and the high voltage is applied to the cathode of the magnetron, and meanwhile, the 3.3V voltage is also applied to two ends of the cathode of the magnetron.
The main ink of the magnetron consists of an oxygen-free copper anode resonant cavity, a bracket, a radiating fin, a coupling antenna, a magnet and a filament. Wherein the filament (i.e., cathode) rapidly emits a sufficient amount of electrons at the heated surface. The cathode must have good mechanical strength to withstand the impact of the partial back-bombardment electrons, and is typically made of thorium tungsten wire. The anode is made of oxygen-free copper with good electric conductivity and air tightness, the heat radiating fins are arranged outside the anode to radiate heat energy consumed by the magnetron during working, the cavity form of the anode is generally in a hole-groove type, the number of resonant cavities is even, and a multi-cavity resonant system determines the oscillation frequency of the magnetron.
The axial constant magnetic field required for operation of the magnetron is generated by permanent magnets. When the magnetron is powered on, electrons in the radial direct current electric field do linear motion between the cathode and the anode. Electrons in the axial stable and constant magnetic field do spiral line motion near the circular surface of the cathode, and the electric field force and the magnetic field force jointly act on the electrons to enable the electrons to do cycloid motion. In the orthogonal electric field and magnetic field, electrons realize mutual conversion of kinetic energy and potential energy. Meanwhile, the kinetic energy of high-speed electrons is converted into the energy of an electromagnetic field, and the amplified electromagnetic field is transmitted to the outside of the magnetron through the coupling antenna.
Connecting one path of the control circuit of the singlechip: the 127V voltage is transformed by a transformer on the circuit board of the single chip microcomputer to obtain two paths of direct current voltage of 12VDC (for supplying power to the relay) and 5VDC (for supplying power to the single chip microcomputer), thereby ensuring the normal work of the control circuit.
In an embodiment of the invention, the explosion-proof mining intelligent food heating device further comprises a temperature and humidity information acquisition module. The temperature and humidity information acquisition module is used for acquiring the temperature and the humidity near the intelligent food heating device for the explosion-proof mine. The control module is also used for controlling the explosion-proof mining intelligent food heating device to be powered off when the temperature exceeds a preset temperature threshold or the humidity exceeds a preset temperature threshold.
Fig. 4 is a block diagram of a control circuit of a single chip microcomputer according to an embodiment of the present invention. As shown in fig. 4, the mining intrinsic safety power supply provides working voltage for various components, has higher safety, and is suitable for supplying power to mining equipment.
The temperature and humidity sensors are used for monitoring the temperature of the magnetron and the transformer and the ambient humidity of the magnetron and the transformer, and the circuit is automatically cut off when the temperature is too high or the humidity is too high, so that the safety of the heating device and the safety of workers are improved.
In an embodiment of the invention, the intelligent food heating device for the explosion-proof mine further comprises a communication module, and the communication module is used for uploading the equipment working information of the intelligent food heating device for the explosion-proof mine to the ground monitoring terminal in real time. Specifically, the intelligent control system adds an Ethernet interface module, has a networking function, and can upload the working condition of the equipment to a ground monitoring center in real time by matching with a corresponding control system, so that intelligent control is realized.
The clock module provides oscillation clock for the single chip microcomputer.
In one embodiment of the invention, the intelligent food heating device for the explosion-proof mine further comprises a keyboard input module. The keyboard input module is connected with the frequency conversion control circuit and is used for inputting power and time information to the frequency conversion control circuit so that the frequency conversion control circuit can control the working state parameters of the magnetron according to the input power and time information.
Magnetron supply voltage feedback signal: the single chip microcomputer can control the output of the PWM modulation wave according to the size of the feedback signal, so that the frequency of the output signal of the frequency conversion chip is changed, the switching frequency of a switching tube in the full-bridge inverter circuit is changed, and frequency conversion adjustment is achieved.
Fig. 5 is a block diagram of a microwave power circuit according to an embodiment of the present invention. As shown in fig. 5, the 127V voltage of the mine is rectified and filtered and then sent to the full-bridge inverter circuit module, and the full-bridge inverter circuit changes the voltage applied to the two ends of the magnetron by changing the switching frequency of the switching tube under the control of the frequency conversion main control chip, thereby realizing the frequency conversion power regulation.
The 127V input voltage is rectified and filtered and is sent to a corresponding pin of the variable-frequency main control chip, and the variable-frequency main control chip can change the frequency of an output signal according to the change of the voltage of the input voltage, so that the switching frequency of the switching tube is changed, the secondary voltage of the transformer is changed, and the voltage stabilizing function is realized.
The underground voltage of the coal mine is low (only 127V), and if a half-bridge or forward conversion topological circuit structure is adopted according to a traditional microwave power supply, the design difficulty of a high-frequency transformer is increased. Therefore, the phase shift control full-bridge conversion technology is adopted here.
On the basis of adopting a phase-shifted full-bridge technology, the microwave power supply utilizes the output capacitor of the power MOS tube and the leakage inductance of the output transformer as resonance elements to enable four switching tubes in the full-bridge converter to be sequentially conducted under zero voltage, so that the soft switching technology is realized. Because the loss in the switching process is reduced, the voltage of the primary side of the transformer is improved, and the efficiency of the converter can be ensured to reach 80-90%; meanwhile, the heating condition of the switching tube in the switching process is reduced, and the safe and stable operation of the microwave power supply is facilitated, so that the switching tube is very suitable for being used underground.
The explosion-proof mining intelligent food heating device provided by the embodiment of the invention is used for heating the whole body inside and outside synchronously, and has the advantages of uniform heating, small energy loss, selective heating, high heating efficiency and the like compared with the conventional external heating method (conduction, convection and radiation).
The quality of the processed material is greatly improved by the action of the uniformly penetrating energy. For example, high-quality magnetic materials, power battery materials and iron nitride alloy materials in the world can be produced by adopting a microwave high-temperature synthesis technology.
The heating or processing time of the material is greatly shortened through the integral synchronous energy action, and the heating or processing efficiency is improved by several times or even hundreds of times. If the microwave sintering technology is adopted to produce the silicon nitride manganese, the efficiency is improved by 30 times, and the production cost is reduced by 70 percent.
The material has high heating or processing efficiency, so that the energy is remarkably saved, and the electricity can be saved by over 50 percent compared with the electricity saved by a conventional electric heating kiln, for example, the electricity can be saved by about 80 percent when the material for firing the silicon nitride manganese.
The explosion-proof mining intelligent food heating device provided by the embodiment of the invention can monitor the surrounding gas concentration, and control the heating device to be powered off when the gas concentration exceeds the limit, so that the heating device is effectively prevented from exploding. In addition, a temperature and humidity sensor is arranged to acquire temperature and humidity information of the heating device, and the heating device is controlled to be powered off when the temperature is too high or the humidity is too high, so that the heating device is further prevented from exploding. Heating device sends operating condition information for ground monitoring center, makes things convenient for the staff of people to carry out real time monitoring to heating device's operating condition in the ground control, and when heating device was in dangerous state, the staff can inform the personnel in the pit to close heating device, can promote heating device's security, guarantees the security that the staff heating was eaten simultaneously. The microwave power supply adopted by the heating device adopts a phase-shift control full-bridge conversion technology, so that the design difficulty can be effectively reduced.
In addition, other structures and functions of the explosion-proof mining intelligent food heating device provided by the embodiment of the invention are known to those skilled in the art, and are not described in detail in order to reduce redundancy.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The utility model provides an intelligent food heating device for explosion-proof mine which characterized in that includes:
the microwave heating module is used for carrying out microwave heating;
the gas concentration acquisition module is used for acquiring the gas concentration near the intelligent food heating device for the explosion-proof mine;
and the control module is used for controlling the explosion-proof mining intelligent food heating device to be powered off when the gas concentration exceeds a preset gas concentration threshold value.
2. The intelligent explosion-proof mining food heating apparatus of claim 1, further comprising:
the temperature and humidity information acquisition module is used for acquiring the temperature and the humidity near the intelligent food heating device for the explosion-proof mine;
the control module is also used for controlling the explosion-proof mining intelligent food heating device to be powered off when the temperature exceeds a preset temperature threshold value or the humidity exceeds a preset temperature threshold value.
3. The intelligent explosion-proof mining food heating apparatus of claim 1, further comprising:
and the communication module is used for uploading the equipment working information of the intelligent food heating device for the explosion-proof mine to a ground monitoring terminal in real time.
4. The intelligent explosion-proof mining food heating apparatus of claim 1, wherein the microwave heating module comprises:
the power interface is used for connecting an external power supply;
the full-bridge filtering and rectifying module is used for performing full-bridge filtering and rectifying on the voltage provided by the external power supply to obtain direct-current voltage;
the full-bridge conversion module and the transformation module are used for processing the direct-current voltage to obtain a first alternating-current voltage circuit and a second alternating-current voltage circuit;
the cathode of the magnetron is respectively connected with the first alternating voltage circuit and the second alternating voltage circuit;
the voltage sampling module is connected with the magnetron and is also used for collecting the voltage of the magnetron;
and the frequency conversion control circuit is connected with the power interface, the full-bridge conversion module and the voltage sampling module and is used for controlling the full-bridge conversion module according to the voltage of the magnetron so as to realize frequency conversion regulation.
5. The intelligent explosion-proof mining food heating apparatus of claim 4, wherein the first AC voltage circuit provides 4400V AC voltage, the second AC voltage circuit provides 3.3V AC voltage, the first AC voltage circuit is used for connecting the first end of the magnetron cathode, and the second AC voltage circuit is used for connecting the first end and the second end of the magnetron cathode.
6. The intelligent explosion-proof mining food heating apparatus of claim 5, wherein the first AC voltage circuit comprises:
and the voltage doubling circuit is connected between the voltage transformation module and the first end of the magnetron cathode and is used for performing voltage doubling transformation.
7. The intelligent food heating device for the explosion-proof mine according to claim 4, wherein an optical coupling isolation module is further arranged between the voltage acquisition module and the variable frequency control circuit.
8. The intelligent explosion-proof mining food heating apparatus of claim 4, further comprising:
and the display module is connected with the control module and used for displaying the working state information of the intelligent food heating device for the explosion-proof mine.
9. The intelligent explosion-proof mining food heating apparatus of claim 8, wherein the display module is an explosion-proof display.
10. The intelligent explosion-proof mining food heating apparatus of claim 4, further comprising:
and the keyboard input module is connected with the variable frequency control circuit and is used for inputting power and time information to the variable frequency control circuit so that the variable frequency control circuit can control the working state parameters of the magnetron according to the input power and time information.
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| CN201910995640.3A CN110856300A (en) | 2019-10-18 | 2019-10-18 | Explosion-proof mining intelligent food heating device |
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Application publication date: 20200228 |