Mining heating system based on graphene carbon fiber electric heating film

Abstract

The present invention discloses a mining heating system based on graphene carbon fiber electric heating film, and relates to the field of mining temperature control. The system includes an electrical control system, a monitoring system and an electric heating film fixing protection device; the electrical control system is a dual temperature control system, including a power supply circuit, a load circuit, a dual control circuit, a PLC control circuit and a K-type temperature controller circuit; the monitoring system includes configuration monitoring and video monitoring, and the temperature value and video information are collected respectively by a temperature sensor and a video monitoring camera, and alarm conditions are set for control; the electric heating film fixing protection device includes an electric heating film fixing protection device fixed on the gate and an electric heating film fixing protection device fixed on the residual load, both of which include an electric heating film and an aluminum silicate insulation cotton layer, so that heat is only conducted to the place where heating is required. The present invention effectively solves the problem of environmental pollution, not only saves a lot of manpower, material resources and financial resources, but also ensures the safety of heating or heating.

Description

Technical Field

[0001] The invention relates to the field of temperature control for mines, and in particular to a heating system for mines based on a graphene carbon fiber electric heating film. Background Art

[0002] In some coal mines, there are usually large coal storage bunkers on the ground for loading trains. The lower part of the coal storage bunker is equipped with coal spouts and gates. Effective anti-freeze measures need to be taken in winter to ensure that the coal spouts and gates are not frozen and to ensure that the trains are shipped on time. In the past, coal-fired boilers were usually used to provide hot air to the bottom of the coal storage bunker to achieve anti-freeze purposes. For example, a 4,000-ton coal storage bunker would use 2 tons of coal per year. However, this method has high energy consumption and high pollution. It is an equipment that is explicitly eliminated by environmental protection policies, so it needs to be eliminated and demolished. Therefore, in order to solve the problem of gate anti-freeze, it is necessary to develop a low-cost, low-energy, safe and reliable electric heating system to completely solve the gate anti-freeze problem. Summary of the invention

[0003] In order to solve the problem of gate antifreeze with low cost, low energy consumption, safety and reliability, the present invention provides a mining heating system based on graphene carbon fiber electric heating film.

[0004] The present invention is realized by the following technical scheme: a mining heating system based on graphene carbon fiber electric heating film, including an electrical control system, a monitoring system and an electric heating film fixing and protecting device;

[0005] 1. The electrical control system is a dual temperature control system, including a power supply circuit, a load circuit, a dual control circuit, a PLC control circuit and a K-type temperature controller circuit; the number of loads is set to n, which are load I, load II...load n;

[0006] Power supply circuit: including the main leakage protection circuit breaker QF and the main contactor KM. The normally open contact of the main contactor KM is connected in series with the lamp L2 and then connected in parallel with the push button switch SB1. The parallel circuit formed is connected in series with the coil of the main contactor KM and the push button switch SB2 to form a series circuit I. The normally closed contact of the main contactor KM is connected in series with the lamp L1 to form a series circuit II. The series circuit I and the series circuit II are connected in parallel to the single-phase power supply through the corresponding fuse FU;

[0007] Load circuit: The loads I, II, ..., n are connected to the corresponding contactors KM1, KM2, ..., KM n The normally open contacts and leakage protection circuit breakers QF1, QF2, ... QFn are connected in series and connected to one phase of the three-phase power supply respectively. The number of loads connected to phase A, phase B, and phase C is n / 3, which is rounded to an integer to ensure that all loads are connected;

[0008] PLC control circuit: including a PLC programmable controller, wherein a plurality of input ports of the PLC programmable controller are connected to a corresponding number of contactors KM, and an output port is connected to a corresponding number of coils of intermediate relays J, the number of contactors KM and intermediate relays J is one more than the number of loads, and the contactors KM are divided into contactors KM1, KM2, ... KM corresponding to the loads. n In addition, there is also a contactor KM n+1 The intermediate relays J are J1, J2...J n , J n+1 ; The intermediate relay J n+1 Single control contactor KM n+1 Action, the PLC control circuit is connected to the single-phase power supply through the transformer T, the corresponding fuse FU and the leakage protection circuit breaker QF, and the PLC programmable controller is also connected to the temperature transmitter VII;

[0009] K-type temperature controller circuit: includes several K-type temperature controllers, the number of which is equal to the number of loads, and the K-type temperature controllers are K1, K2...K n ; All K-type temperature controllers are powered through contactor KM n+1 The normally closed contact, the corresponding fuse FU and the leakage protection circuit breaker QF are connected to the single-phase power supply;

[0010] Dual control circuit: All K-type temperature controllers have normally open contacts connected to contactor KM n+1 The normally open contacts of the circuits are connected in parallel, and the circuits connected in parallel are connected to the corresponding contactors KM1, KM2, ... n The coils are connected in series, and the series circuits formed are then connected to the corresponding intermediate relays J1, J2...J n The normally closed contacts of are connected in series to form a dual control circuit, which is connected to the single-phase power supply through the corresponding fuse FU and the leakage protection circuit breaker QF;

[0011] 2. The monitoring system includes multiple temperature sensors and multiple video surveillance cameras. The temperature sensors are installed in each heating unit. The video surveillance cameras are distributed at each load location. The temperature sensors are connected to RS485 photoelectric converter I and connected to RS485 photoelectric converter II through a communication optical cable. The RS485 photoelectric converter II is connected to RS485 to RS232 passive converter. The RS485 to RS232 passive converter is connected to a configuration monitoring computer.

[0012] The video surveillance camera is connected to an Ethernet switch I, which is connected to an Ethernet photoelectric converter I and then to an Ethernet photoelectric converter II via a communication optical cable, and then to an Ethernet photoelectric converter II and an Ethernet switch II, and then to a video surveillance computer; the Ethernet switch I is also connected to a PLC controller; the PLC controller is connected to a configuration monitoring computer via an Ethernet switch I, an Ethernet photoelectric converter I, a communication optical cable, an Ethernet photoelectric converter II, and an Ethernet switch II;

[0013] 3. Electric heating film fixed protection device: The electric heating film fixed protection device includes an electric heating film fixed protection device fixed on the gate and an electric heating film fixed protection device fixed on the residual load:

[0014] The electric heating film fixed protection device fixed on the gate is fixed on the outer side of the gate iron plate, and the gate iron plate is arc-shaped. The electric heating film fixed protection device includes a protective shell and a heating unit. The heating unit is located inside the protective shell. The shape of the protective shell matches the gate iron plate, and the left and right edges and the lower edge are welded to the gate iron plate, so that a filling gap is left between the protective shell and the gate iron plate. The upper edge of the protective shell is open and provided with a protective shell cover. The protective shell cover is installed on the gate iron plate by sealing rubber and bolts. A trumpet mouth mounting hole is also provided on the iron sheet at the left edge of the protective shell; the heating unit includes an aluminum silicate thermal insulation cotton layer, a universal adhesive layer, a tinplate, an electric heating film and a temperature sensor. In order from the gate iron plate to the outside, there are temperature sensors, electric heating films, aluminum silicate thermal insulation cotton layers and tinplate. Adjacent components are bonded together by a universal adhesive layer. The electric heating film and the temperature sensor are tightly attached to the gate iron plate. The electric wires of the electric heating film pass through the aluminum silicate thermal insulation cotton layer, extend from the horn mouth mounting hole to be connected to the circuit, and a water-conducting angle iron is tightly fixed to the lower side of the electric heating film fixing protection device. The electric heating film fixing protection device fixed on the residual load includes an electric heating film and an aluminum silicate thermal insulation cotton layer. The electric heating film is attached to the heating body, and the aluminum silicate thermal insulation cotton layer covers the outer side of the electric heating film. A temperature sensor is also provided on the inner side of the electric heating film; the aluminum silicate thermal insulation cotton layer is also wrapped with aluminum foil.

[0015] In order to achieve the antifreeze of the gate on the coal mine, the present invention has developed a mining heating system based on graphene carbon fiber electric heating film, including an electrical control system, a monitoring system and an electric heating film fixing and protection device. The present invention firstly selects graphene carbon fiber electric heating film as a heat source, and its power is 200-400W / m 2The electric heat conversion rate is as high as 98%. It has the characteristics of uniform heating, high heating efficiency, low energy consumption, acid resistance, alkali resistance, aging resistance, long service life and certain waterproofness. Therefore, it is the most ideal electric heating body for gates or industrial equipment. In order to avoid spontaneous combustion of coal heating or freezing of gates due to insufficient heat, a dual temperature control system has been developed to realize dual temperature control protection functions. One is to realize temperature control through the execution of programming commands by PLC programmable controller, and the other is to realize temperature control through K-type temperature controller. The two sets of temperature control methods form one main and one standby to ensure that the temperature control is always effective. The schematic diagram is as follows Figure 1 As shown. Based on the above systems and devices, we found that it is also necessary to monitor the video and temperature of each gate, so a temperature monitoring system is also set up. The temperature sensor and PLC controller are configured through the configuration software of the monitoring computer. The data of each sensor transmitted by the temperature sensor can be displayed to achieve real-time monitoring of each heating unit, and set alarm prompts such as low temperature, high temperature, and failure. When a heating unit of the electric heating system fails, the alarm music can be played in time, and the alarm information window will pop up to prompt the maintenance personnel to go and deal with the failure. The schematic diagram is shown as follows Figure 2 The three parts work together to ensure safe and reliable operation of the heating system. The working process is as follows:

[0016] 1. Electrical control system: After closing the main leakage protection circuit breaker QF, press the SB1 start button, the main contactor KM is energized, the over-voltage and under-voltage protectors are automatically energized, all leakage protection circuit breakers QF are closed, and each power supply and control part completes basic power supply and enters the automatic control stage. The K-type temperature controller starts, namely K1-Kn. It separates and closes the K1-Kn normally open contacts according to the set temperature value, thereby performing constant temperature heating control on the KM1-KMn heating group; in order to prevent the relay in the K-type temperature controller from being damaged by long-term and high-frequency use, the present invention uses PLC to write a temperature control program for standby control. If the K-type temperature controller fails, the PLC controls the J n+1 Implement KM n+1 Action, KM n+1 The normally open contact of the K-type thermostat closes and shorts the normally open contact, KM n+1The normally closed contacts of K-type thermostats are opened to cut off the power supply to all K-type thermostats. At this time, the system enters the PLC single control mode. For example, we will heat the coal storage bin to 30 degrees, and the temperature set to K1 is 30 degrees. When the heating element is below 28 degrees, K1 will be energized, and when the temperature rises to 30 degrees, K1 will be disconnected. If the PLC program is programmed so that J1 is energized at 35 degrees, the normally closed contact of J1 is disconnected, and KM1 is disconnected. When the temperature drops below 32 degrees, J1 is released, the J1 contacts are closed, and KM1 is closed to start heating. If K1 cannot be disconnected, when the temperature continues to rise to 35 degrees, J1 will disconnect the KM1 power supply, ending the heating, and heating will begin when the temperature drops to 32 degrees. This avoids the problem of overheating caused by the inability to disconnect K1. If K1 cannot be closed, when the temperature drops to 25 degrees, the remote monitoring computer will issue a low temperature alarm, and the monitoring personnel will pull in J through remote operation. n+1 , KM n+1 Action, disconnect all K-type thermostats, and short-circuit K1-Kn contacts. Temperature control is completely realized by PLC. Maintenance personnel immediately went to the site to disconnect QF circuit breaker, replace K-type temperature controller, and use temperature transmitter Ⅶ to connect with temperature sensor to collect temperature signal.

[0017] 2. Monitoring system: The monitoring system of the present invention can monitor the temperature value of each gate through the remote computer in the computer room, and set alarm prompts such as low temperature, high temperature, and fault. When a heating unit of the electric heating system fails, it can promptly send out alarm music, pop up an alarm information window, and prompt the maintenance personnel to go to deal with the fault. The temperature sensor is input into the temperature sensor according to the order of numbering and the order of installation position, and the temperature sensor can collect and store temperature values ​​in sequence. The communication mode of the temperature sensor is RS485 bus mode. We use RS485 photoelectric converter to transmit RS485 signal to the monitoring room through optical cable, and then convert the signal through RS485 to RS232 passive converter and connect it to the computer. This monitoring system also uses PLC controller, and has its own Ethernet port. The Ethernet communication signal of the PLC controller is connected to the configuration monitoring computer through Ethernet switch I, Ethernet photoelectric converter I, communication optical cable, Ethernet photoelectric converter II, and Ethernet switch II. The configuration monitoring computer uses configuration software to configure the temperature sensor and PLC, which can display the data of each sensor transmitted by the temperature sensor, realize real-time monitoring of each heating unit, and achieve the purpose of system automation and intelligent use. The monitoring system also includes video monitoring. Video monitoring cameras are installed at key locations of each gate or hydraulic pump station. When the system fails, maintenance personnel can observe the general situation based on the video images and perform relevant operations in conjunction with the prompt information on the monitoring computer. Since the locations of the monitoring points are relatively close, the cameras use POE power supply, which saves the use of power lines. The video signal is transmitted to the monitoring room through the POE switch and the optoelectronic converter.

[0018] 3. Electric heating film fixed protection device: Since the electric heating film itself generates little heat, certain insulation measures must be taken during installation and use to achieve the purpose of cold protection of the equipment. During installation, the electric heating film needs to be attached to the heating body, and then the electric heating film is covered with insulation cotton to allow heat to be conducted only to the place that needs heating. The insulation cotton needs to be high-temperature resistant aluminum silicate wool wrapped in aluminum foil. The aluminum foil can reflect the far-infrared waves generated by the electric heating film, and the high-temperature resistant aluminum silicate wool can prevent the spread of fire caused by the electric heating film catching fire (a small probability event). The electric heating film fixed protection device includes an electric heating film fixed protection device fixed on the gate and an electric heating film fixed protection device fixed on the residual load: the electric heating film fixed protection device fixed on the gate is fixed to the outside of the gate iron plate, and waterproofness, fire resistance and resistance to external forces must be considered. The gate iron plate is arc-shaped. The electric heating film protection device includes a protective shell and a heating unit. The heating unit is located inside the protective shell. After the heating unit is assembled, it is directly inserted into the protective shell through the opening on the upper edge of the protective shell. The shape of the protective shell matches the gate iron plate, and the left and right edges and the lower edge are welded to the gate. The protective shell is provided with a cover, which is installed on the gate iron plate through sealing rubber and bolts. The cover is made on the opening of the protective shell, which is convenient for the insertion of the electric heating film and the thermal insulation cotton and good sealing. At the same time, if the 220V power supply is short-circuited or catches fire in the shell, it will not cause any damage or deformation to the protective shell and the protective shell cover. A trumpet mouth mounting hole is also provided on the iron sheet on the left edge of the protective shell. The heating unit includes a temperature sensor, an electric heating film, an aluminum silicate thermal insulation cotton layer and a tinplate in the order from the gate iron plate to the outside. , adjacent components are bonded together by a universal adhesive layer to ensure that the electric heating film and the temperature sensor are in close contact with the gate iron plate; the electric heating film is used to heat the gate iron plate, and the temperature sensor is used to collect temperature. The aluminum silicate insulation cotton layer is glued to the electric heating film so that heat is only conducted to the gate that needs to be heated. Since the aluminum foil can reflect the far-infrared waves generated by the electric heating film, the aluminum silicate insulation cotton layer is also wrapped with aluminum foil, and the high-temperature resistant aluminum silicate cotton can prevent the spread of fire caused by the electric heating film. The tinplate is glued to the outside of the aluminum silicate insulation cotton layer through a universal adhesive layer, and a temperature sensor is also provided on the inside of the electric heating film. The two are closely attached to the gate iron plate for heat transfer and temperature data collection; the electric wires of the electric heating film pass through the aluminum silicate thermal insulation cotton layer, and extend from the trumpet mouth mounting hole to connect with the circuit, and the lower side of the electric heating film fixed protection device is closely fixed with a water guide angle iron, which can guide the water flowing down in the coal bunker away without corroding the protective shell; the electric heating film fixed protection device fixed on the residual load, because the heating body is not fixed, so a universal method is adopted to make the electric heating film attached to the heating body, and the aluminum silicate thermal insulation cotton layer can be fixed in any way to cover the outside of the electric heating film to ensure the direction of heat conduction.

[0019] Compared with the prior art, the present invention has the following beneficial effects: the mining heating system based on graphene carbon fiber electric heating film provided by the present invention is compared with the original coal-fired boiler heating. When the original coal-fired boiler is used for heating, taking a 4,000-ton coal storage bunker as an example, the annual cost is calculated as follows: the boiler consumes an average of 3 tons of high-quality lump coal and about 60 kilograms of desulfurized caustic soda per day, with a total value of about 2,400 yuan / day; the total power of the boiler induced draft fan and blower and other equipment is 55KW, and the electricity consumption for 24 hours is 924 yuan at 0.7 yuan per kilowatt-hour; the heating is 150 days a year, of which 24 hours is about 90 days, and 12 hours is about 60 days; the average annual boiler maintenance fee is 30,000 yuan; the annual salary of the boiler operator is 50,000 yuan; in summary, the annual consumption is: , a total of 479,000 yuan was consumed; after replacing the graphene carbon fiber electric heating film mining heating system, the total annual consumption of the electric heating system is 20,000 yuan, as follows: the construction cost is about 70,000 yuan, the total system power is 9KW, because the temperature control adjustment starts and stops, and it works an average of 18 hours a day, and the electricity cost is calculated at 0.7 yuan per kilowatt-hour. The electricity bill for the 5-month heating period each year is 17,000 yuan; the annual maintenance and replacement of parts does not exceed 3,000 yuan; there is no need to set up special posts for system monitoring and maintenance personnel, and this work can be included in the daily work arrangement of the coal station electromechanical maintenance team, without additional labor costs, so the total consumption is 17,000+3,000=20,000 yuan; after comparison, the present invention saves manpower, material resources and financial resources compared with the original coal-fired boiler, saving about 460,000 yuan each year. Therefore, the mining heating system based on graphene carbon fiber electric heating film provided by the present invention has stable operation, high safety, good effect, and is also energy-saving and environmentally friendly, creating greater social benefits for environmental protection and social development; the present invention uses graphene carbon fiber electric heating film to directly stick on the coal storage bin gate or other heating body, and the outside is covered with insulation material, and the heat loss is almost zero, achieving a good heating and antifreeze purpose. The mining heating system provided by the present invention effectively solves the problem of environmental pollution, not only saves a lot of money, but also ensures heating safety, so the heating system has a wide range of applications and has a broad prospect for promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the electrical principle diagram of the electrical control system of the present invention.

[0021] Figure 2 It is a structural schematic diagram of the monitoring system of the present invention.

[0022] Figure 3 The front view of the electric heating film fixing and protecting device fixed on the gate of the present invention.

[0023] Figure 4 The figure is a side view of the electric heating film fixing and protecting device fixed on the gate of the present invention.

[0024] Figure 5 It is a schematic diagram of the filling inside of the protective shell of the electric heating film fixing protection device fixed on the gate of the present invention.

[0025] The markings in the figure are as follows: 1-aluminum silicate insulation cotton layer, 2-universal adhesive layer, 3-tin sheet, 4-protective shell, 5-electric heating film, 6-temperature sensor, 7-bell mouth mounting hole, 8-water guide angle iron, 9-gate iron plate, 10-sealing rubber, 11-bolt, 401-protective shell cover, 101-video surveillance camera, 102-temperature sensor, 103- RS485 photoelectric converter I, 104-Ethernet photoelectric converter I, 105-Ethernet switch I, 106-PLC controller, 107-communication optical cable, 108-RS485 to RS232 passive converter, 109- RS485 photoelectric converter II, 110-Ethernet photoelectric converter II, 111-Ethernet switch II, 112-video surveillance computer, 113-configuration monitoring computer. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with specific embodiments.

[0027] A mining heating system based on graphene carbon fiber electric heating film: Figures 1 to 5 As shown, it includes an electrical control system, a monitoring system and an electric heating film fixing and protecting device;

[0028] 1. The electrical control system is a dual temperature control system, including a power supply circuit, a load circuit, a dual control circuit, a PLC control circuit and a K-type temperature controller circuit; the number of loads is set to n, which are load I, load II...load n;

[0029] Power supply circuit: including the main leakage protection circuit breaker QF and the main contactor KM. The normally open contact of the main contactor KM is connected in series with the lamp L2 and then connected in parallel with the push button switch SB1. The parallel circuit formed is connected in series with the coil of the main contactor KM and the push button switch SB2 to form a series circuit I. The normally closed contact of the main contactor KM is connected in series with the lamp L1 to form a series circuit II. The series circuit I and the series circuit II are connected in parallel to the single-phase power supply through the corresponding fuse FU;

[0030] Load circuit: The loads I, II, ..., n are connected to the corresponding contactors KM1, KM2, ..., KM n The normally open contacts and leakage protection circuit breakers QF1, QF2, ... QFn are connected in series and connected to one phase of the three-phase power supply respectively. The number of loads connected to phase A, phase B, and phase C is n / 3, which is rounded to an integer to ensure that all loads are connected;

[0031] PLC control circuit: including a PLC programmable controller, wherein a plurality of input ports of the PLC programmable controller are connected to a corresponding number of contactors KM, and an output port is connected to a corresponding number of coils of intermediate relays J, the number of contactors KM and intermediate relays J is one more than the number of loads, and the contactors KM are divided into contactors KM1, KM2, ... KM corresponding to the loads. n In addition, there is also a contactor KM n+1 The intermediate relays J are J1, J2...J n , J n+1 ; The intermediate relay J n+1 Single control contactor KM n+1 Action, the PLC control circuit is connected to the single-phase power supply through the transformer T, the corresponding fuse FU and the leakage protection circuit breaker QF, and the PLC programmable controller is also connected to the temperature transmitter VII;

[0032] K-type temperature controller circuit: includes several K-type temperature controllers, the number of which is equal to the number of loads, and the K-type temperature controllers are K1, K2...K n ; All K-type temperature controllers are powered through contactor KM n+1 The normally closed contact, the corresponding fuse FU and the leakage protection circuit breaker QF are connected to the single-phase power supply;

[0033] Dual control circuit: All K-type temperature controllers have normally open contacts connected to contactor KM n+1 The normally open contacts of the circuits are connected in parallel, and the circuits connected in parallel are connected to the corresponding contactors KM1, KM2, ... n The coils are connected in series, and the series circuits formed are then connected to the corresponding intermediate relays J1, J2...J n The normally closed contacts of are connected in series to form a dual control circuit, which is connected to the single-phase power supply through the corresponding fuse FU and the leakage protection circuit breaker QF;

[0034] 2. The monitoring system includes a plurality of temperature sensors 102 and a plurality of video surveillance cameras 101. The temperature sensors 102 are installed in each heating unit. The video surveillance cameras 101 are distributed at each load location. The temperature sensors 102 are connected to RS485 photoelectric converter I 103, and are connected to RS485 photoelectric converter II 109 through a communication optical cable 107. The RS485 photoelectric converter II 109 is connected to RS485 to RS232 passive converter 108, and the RS485 to RS232 passive converter 108 is connected to a configuration monitoring computer 113.

[0035] The video surveillance camera 101 is connected to the Ethernet switch I 105, the Ethernet switch I 105 is connected to the Ethernet photoelectric converter I 104 and then connected to the Ethernet photoelectric converter II 110 through the communication optical cable 107, the Ethernet photoelectric converter II 110 is connected to the Ethernet switch II 111 and then connected to the video surveillance computer 112; the Ethernet switch I 105 is also connected to the PLC controller 106; the PLC controller 106 is connected to the configuration monitoring computer 113 through the Ethernet switch I 105, the Ethernet photoelectric converter I 104, the communication optical cable 107, the Ethernet photoelectric converter II 110, and the Ethernet switch II 111;

[0036] 3. Electric heating film fixed protection device: The electric heating film fixed protection device includes an electric heating film fixed protection device fixed on the gate and an electric heating film fixed protection device fixed on the residual load:

[0037] The electric heating film fixed protection device fixed on the gate is fixed to the outer side of the gate iron plate 9, and the gate iron plate 9 is arc-shaped. The electric heating film fixed protection device includes a protective shell 4 and a heating unit. The heating unit is located inside the protective shell 4. The shape of the protective shell 4 matches the gate iron plate 9, and the left and right edges and the lower edge are welded to the gate iron plate 9, so that a filling gap is left between the protective shell 4 and the gate iron plate 9. The upper edge of the protective shell 4 is open and provided with a protective shell cover 401. The protective shell cover 401 is installed on the gate iron plate 9 through a sealing rubber 10 and a bolt 11. A trumpet mouth mounting hole 7 is also provided on the iron sheet at the left edge of the protective shell 4; the heating unit includes an aluminum silicate thermal insulation cotton layer 1, a universal adhesive layer 2, a tinplate 3, an electric heating film 5 and a temperature sensor Sensor 6, in order from the gate iron plate 4 to the outside, are temperature sensor 6, electric heating film 5, aluminum silicate thermal insulation cotton layer 1 and tinplate 3, adjacent components are bonded together by a universal adhesive layer 2, the electric heating film 5 and the temperature sensor 6 are close to the gate iron plate 4; the wires of the electric heating film 5 pass through the aluminum silicate thermal insulation cotton layer 1, and extend from the trumpet mouth mounting hole 7 to connect with the circuit, and the lower side of the electric heating film fixing protection device is closely fixed with a water guide angle iron 8; the electric heating film fixing protection device fixed on the residual load includes an electric heating film 5 and an aluminum silicate thermal insulation cotton layer 1, the electric heating film 5 is attached to the heating body, the aluminum silicate thermal insulation cotton layer 1 covers the outside of the electric heating film, and the inside of the electric heating film 5 is also provided with a temperature sensor 6; the aluminum silicate thermal insulation cotton layer 1 is also wrapped with aluminum foil.

[0038] In this embodiment, the number n of the loads is 6, so the number of contactors KM is 7, the number of intermediate relays J is also 7, the temperature sensor 6 is a DS18B20 temperature sensor, and the temperature sensor 6 bus uses a shielded wire with a wire diameter greater than 0.75 mm; further, in this embodiment, a shielded 4-core twisted pair cable is used, one pair of wires is connected to the ground wire and the signal wire respectively, and the other pair of wires is connected to Vcc and the ground wire, and the shielding layer is grounded at a single point at the source end; the protective shell 4 uses a 5mm iron plate, and a 5cm gap is formed between the protective shell 4 and the gate iron plate 9.

[0039] In this embodiment, Figure 1 As shown, in the load circuit: load Ⅰ, load Ⅱ...load VI correspond to KM1, KM2...KM6 and QF1, QF2...QF6 respectively, and the number of loads connected to phase A, phase B and phase C is 2, that is, every two loads are connected to phase A, phase B and phase C respectively; in the double control circuit: the fuse is FU2, and the leakage protection circuit breaker QF is QF7; there are 7 contactors KM, in addition to the one connected to the load, there is also KM7; in the PLC control circuit, the fuse is FU3, the leakage protection circuit breaker QF is QF8, and the intermediate relay J is J1, J2...J6, J7 respectively; J7 single controls KM7; in the K-type temperature controller circuit: the fuse is FU4, the leakage protection circuit breaker QF is QF9, and the coils of all K-type temperature controllers are connected to the single-phase power supply through contactor KM7, fuse FU4 and leakage protection circuit breaker QF9.

[0040] The specific operations of this embodiment are as follows:

[0041] 1. Electrical control system: After closing the main leakage protection circuit breaker QF, press the SB1 start button, the main contactor KM is energized, the over-voltage and under-voltage protection devices are automatically energized, and all leakage protection circuit breakers QF are closed. Each power supply and control part completes basic power supply and enters the automatic control stage. The K-type temperature controller starts, namely K1-K6, which separates and closes the normally open contacts of K1-K6 according to the set temperature value, thereby performing constant temperature heating control on the KM1-KM6 heating group; in order to prevent the relay in the K-type temperature controller from being damaged by long-term high-frequency use, this embodiment also uses PLC to write a temperature control program for standby control. If the K-type temperature controller fails, the PLC controls J7 to realize the action of KM7, the normally open contact of KM7 closes and short-circuits the normally open contact of the K-type temperature controller, and the normally closed contact of KM7 opens to cut off the power of all the K-type temperature controllers. At this time, the system enters the PLC single control mode. At this time, the temperature transmitter Ⅶ collects the temperature value and plays an auxiliary role, which can observe whether the K-type temperature controller fails. If the coal storage bin is heated to 30 degrees, and the temperature set for K1~K6 is 30 degrees, K1~K6 will be energized when the heating element is below 28 degrees, and K1~K6 will be disconnected when the temperature rises to 30 degrees. If the PLC program is programmed so that J1~J6 will be energized at 35 degrees, and the normally closed contacts of J1~J6 will be disconnected, then KM1~KM6 will be disconnected. When the temperature drops below 32 degrees, J1~J6 will be released, the contacts of J1~J6 will be closed, and KM1~KM6 will be closed to start heating. If K1 (or other thermostats) cannot be disconnected, when the temperature continues to rise to 35 degrees, J1 will disconnect the power supply of KM1 (or the corresponding intermediate relays of other thermostats will be activated to disconnect the power supply of the contactor), and the heating will end. When the temperature drops to 32 degrees, heating will start, thus avoiding the overheating problem caused by the inability to disconnect the K-type temperature controller. If one of the K-type temperature controllers (such as K1) cannot be closed, when the temperature drops to 25 degrees, the remote monitoring computer will issue a low temperature alarm. The monitoring personnel will remotely operate J7, KM7 will operate, disconnect all K-type temperature controllers, and short-circuit K1-K6 contacts. The temperature control is completely realized by PLC. The maintenance personnel will immediately go to the site to disconnect the QF9 circuit breaker and replace the K-type temperature controller.

[0042] 2. Monitoring system: Each load is equipped with a temperature sensor. The temperature sensor used in the monitoring system is a DS18B20 temperature sensor. A 16-bit serial number has been burned into the ROM of the sensor when it leaves the factory. It can be regarded as the address of the DS18B20. The number sequence is entered into the temperature sensor according to the installation position sequence, and the temperature sensor can collect and store temperature values ​​in sequence; to collect temperature values, the RS485 bus method is used, and the RS485 photoelectric converter is used to transmit the RS485 signal to the monitoring room through the optical cable, and then the signal is converted through the RS485 to RS232 passive converter and connected to the configuration monitoring computer. The monitoring system uses Siemens PLC controller, S7-200SMART, with built-in Ethernet port. The Ethernet communication signal of the PLC controller is connected to the configuration monitoring computer through Ethernet switch Ⅰ105, Ethernet photoelectric converter Ⅰ104, communication optical cable 107, Ethernet photoelectric converter Ⅱ110, and Ethernet switch Ⅱ111. The configuration monitoring computer uses configuration software to configure the temperature sensor and PLC, which can display the data of each sensor transmitted by the temperature sensor, realize real-time monitoring of each heating unit, and set alarm prompts such as low temperature, high temperature, and failure. When a heating unit of the electric heating system fails, it can promptly send out alarm music, pop up an alarm information window, and prompt the maintenance personnel to go to deal with the failure. In the video monitoring part, video monitoring cameras are installed at the key position of each load, using Siemens PLC controller, S7-200SMART, and using Ethernet photoelectric converter to transmit the signal to the monitoring room through optical cable, and then connected to the computer network port. When the system fails, the maintenance personnel can observe the general situation according to the video image and perform relevant operations in conjunction with the prompt information of the monitoring computer.

[0043] 3. Electric heating film fixing protection device: The electric heating film fixing protection device fixed on the gate, the gate iron plate 9 is arc-shaped, the shape of the protective shell 4 matches the gate iron plate 9, the left and right edges and the lower edge of the protective shell 4 are welded to the gate iron plate 9, so that a filling gap is left between the protective shell 4 and the gate iron plate 9. In this embodiment, a gap of 5 cm is left, and then the electric heating film 5 and the aluminum silicate insulation cotton layer 1 are bonded with a universal adhesive layer 2, and a temperature sensor 6 is glued to the inside of the electric heating film 5, and an aluminum foil is wrapped on the outside of the aluminum silicate insulation cotton layer 1, and then the tinplate 3 is glued through the universal adhesive layer 2. On the outside of the aluminum silicate insulation cotton layer 1, the circuit of the electric heating film 5 is fixed in position so that the shape of the entire heating unit is fixed and easy to be inserted into the protective shell 4; then, the formed heating unit is inserted into the protective shell 4 from the opening opened at the upper part of the protective shell 4. After insertion, the protective shell cover 401 covers the upper edge of the protective shell 4 and is installed on the gate iron plate 9 through the sealing rubber 10 and bolts 11. The rubber plays a role of waterproof and airtightness; the water guide angle iron 8 guides the water flowing down in the coal bunker; finally, the circuit is led out and connected to the circuit, and then the heating of the electric heating film is controlled by the electrical control system.

[0044] The scope of protection claimed by the present invention is not limited to the above specific embodiments. For those skilled in the art, the present invention may have various deformations and changes. Any modifications, improvements and equivalent substitutions made within the concept and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A mining heating system based on graphene carbon fiber electric heating film, characterized in that: Including electrical control system, monitoring system and electric heating film fixing protection device; 1. The electrical control system is a dual temperature control system, including a power supply circuit, a load circuit, a dual control circuit, a PLC control circuit and a K-type temperature controller circuit; the number of loads is set to n, which are load I, load II...load n; the number of loads n is 6; Power supply circuit: including the main leakage protection circuit breaker QF and the main contactor KM. The normally open contact of the main contactor KM is connected in series with the lamp L2 and then connected in parallel with the push button switch SB1. The parallel circuit formed is connected in series with the coil of the main contactor KM and the push button switch SB2 to form a series circuit I. The normally closed contact of the main contactor KM is connected in series with the lamp L1 to form a series circuit II. The series circuit I and the series circuit II are connected in parallel to the single-phase power supply through the corresponding fuse FU; Load circuit: The loads I, II, ..., n are connected to the corresponding contactors KM1, KM2, ..., KM n The normally open contacts and leakage protection circuit breakers QF1, QF2, ... QFn are connected in series and connected to one phase of the three-phase power supply respectively. The number of loads connected to phase A, phase B, and phase C is n / 3, which is rounded to an integer to ensure that all loads are connected; PLC control circuit: including a PLC programmable controller, wherein a plurality of input ports of the PLC programmable controller are connected to a corresponding number of contactors KM, and an output port is connected to a corresponding number of coils of intermediate relays J, the number of contactors KM and intermediate relays J is one more than the number of loads, and the contactors KM are divided into contactors KM1, KM2, ... KM corresponding to the loads. n In addition, there is also a contactor KM n+1 The intermediate relays J are J1, J2...J n , J n+1 ; The intermediate relay J n+1 Single control contactor KM n+1 Action, the PLC control circuit is connected to the single-phase power supply through the transformer T, the corresponding fuse FU and the leakage protection circuit breaker QF, and the PLC programmable controller is also connected to the temperature transmitter VII; K-type temperature controller circuit: includes several K-type temperature controllers, the number of which is equal to the number of loads, and the K-type temperature controllers are K1, K2...K n ; All K-type temperature controllers are powered through contactor KM n+1 The normally closed contact, the corresponding fuse FU and the leakage protection circuit breaker QF are connected to the single-phase power supply; Dual control circuit: All K-type temperature controllers have normally open contacts connected to contactor KM n+1 The normally open contacts of the circuits are connected in parallel, and the circuits connected in parallel are connected to the corresponding contactors KM1, KM2, ... n The coils are connected in series, and the series circuits formed are then connected to the corresponding intermediate relays J1, J2...J n The normally closed contacts of are connected in series to form a dual control circuit, which is connected to the single-phase power supply through the corresponding fuse FU and the leakage protection circuit breaker QF; 2. The monitoring system comprises a plurality of temperature sensors (102) and a plurality of video monitoring cameras (101), wherein the temperature sensors (102) are installed in each heating unit, and the video monitoring cameras (101) are distributed in each load location, wherein the temperature sensors (102) are connected to RS485 photoelectric converter I (103), and connected to RS485 photoelectric converter II (109) via a communication optical cable (107), wherein the RS485 photoelectric converter II (109) is connected to an RS485 to RS232 passive converter (108), and wherein the RS485 to RS232 passive converter (108) is connected to a configuration monitoring computer (113); The video surveillance camera (101) is connected to an Ethernet switch I (105), the Ethernet switch I (105) is connected to an Ethernet photoelectric converter I (104) and then connected to an Ethernet photoelectric converter II (110) via a communication optical cable (107), the Ethernet photoelectric converter II (110) is connected to an Ethernet switch II (111) and then connected to a video surveillance computer (112); the Ethernet switch I (105) is also connected to a PLC controller (106); the PLC controller (106) is connected to a configuration monitoring computer (113) via the Ethernet switch I (105), the Ethernet photoelectric converter I (104), the communication optical cable (107), the Ethernet photoelectric converter II (110), and the Ethernet switch II (111); 3. Electric heating film fixed protection device: The electric heating film fixed protection device includes an electric heating film fixed protection device fixed on the gate and an electric heating film fixed protection device fixed on the residual load: The electric heating film fixed protection device fixed on the gate is fixed on the outer side of the gate iron plate (9), the gate iron plate (9) is arc-shaped, the electric heating film fixed protection device comprises a protective shell (4) and a heating unit, the heating unit is located inside the protective shell (4), the shape of the protective shell (4) matches the gate iron plate (9), and the left and right edges and the lower edge are welded to the gate iron plate (9), so that a filling gap is left between the protective shell (4) and the gate iron plate (9), the upper edge of the protective shell (4) is open, and a protective shell cover (401) is provided, the protective shell cover (401) is installed on the gate iron plate (9) through a sealing rubber (10) and a bolt (11), and a trumpet mouth mounting hole (7) is also provided on the iron plate at the left edge of the protective shell (4); the heating unit comprises an aluminum silicate thermal insulation cotton layer (1), a universal adhesive layer (2), a tinplate (3), an electric heating film (5) and a temperature sensor (6), which is installed from the gate iron plate (4) The order from the outside is the temperature sensor (6), the electric heating film (5), the aluminum silicate thermal insulation cotton layer (1) and the tinplate (3), and the adjacent parts are bonded together by the universal adhesive layer (2). The electric heating film (5) and the temperature sensor (6) are closely attached to the gate iron plate (4); the electric wire of the electric heating film (5) passes through the aluminum silicate thermal insulation cotton layer (1) and extends out from the horn mouth mounting hole (7) to connect with the circuit, and the lower side of the electric heating film fixing protection device is closely fixed with a water guide angle iron (8); the electric heating film fixing protection device fixed on the residual load comprises an electric heating film (5) and an aluminum silicate thermal insulation cotton layer (1), the electric heating film (5) is attached to the heating body, the aluminum silicate thermal insulation cotton layer (1) covers the outer side of the electric heating film, and the inner side of the electric heating film (5) is also provided with a temperature sensor (6); the aluminum silicate thermal insulation cotton layer (1) is also wrapped with aluminum foil; the temperature sensor (6) is a DS18B20 temperature sensor.

2. According to claim 1, a mining heating system based on graphene carbon fiber electric heating film is characterized in that: The temperature sensor (6) bus uses a shielded wire with a wire diameter greater than 0.75 mm.

3. According to claim 1, a mining heating system based on graphene carbon fiber electric heating film is characterized in that: The temperature sensor (6) uses a shielded 4-core twisted pair cable, one pair of wires is connected to the ground wire and the signal wire respectively, and the other pair of wires is connected to Vcc and the ground wire, and the shielding layer is grounded at a single point at the source end.

4. According to claim 1, a mining heating system based on graphene carbon fiber electric heating film is characterized in that: The protective shell (4) is made of a 5 mm iron plate, and a gap of 5 cm is formed between the protective shell (4) and the gate iron plate (9).

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