Output power adjusting system and method suitable for explosion-proof energy-saving cabinet

Abstract

The invention belongs to the technical field of intelligent control strategies, and particularly relates to an output power adjusting system and method suitable for an explosion-proof energy-saving cabinet. Each on-site electric heat tracing local control system internally comprises an electric heat tracing control cabinet arranged on an on-site heat tracing belt, each on-site electric heat tracing local control system internally comprises a plurality of heat tracing pipelines arranged on the on-site heat tracing belt, and each electric heat tracing control cabinet supports and is connected with at most 30 heat tracing pipelines. One end of each heat tracing pipeline is connected with a pipeline temperature measuring sensor, and an environment temperature measuring sensor is arranged in the field range of each field electric heat tracing local control system. According to existing data, equipment load can be adjusted to the maximum extent, energy consumption is reduced, overall electric energy calculation is unified, the problem of low statistical efficiency is solved, the data summarization capacity is high, and PLC unified collection and centralized control are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent control strategies, and in particular relates to an output power regulation system and method suitable for explosion-proof energy-saving cabinets. Background Art

[0002] An energy-saving cabinet is a device that uses advanced control technology and intelligent control strategies. It controls parameters such as voltage, current, and frequency to precisely control power equipment, achieve functions such as rapid start and stop, speed regulation, and load balancing, and monitors and analyzes the operating status of power equipment in real time. It adjusts operating parameters according to the equipment status to improve equipment efficiency and extend its life. It has complete safety protection functions, including overcurrent, overvoltage, overload, short circuit and other protection functions, which can effectively protect the safe operation of power equipment and reduce the risk of accidents. The output power regulation system of the energy-saving cabinet aims to improve energy utilization efficiency and reduce energy waste. In actual applications, the appropriate regulation system and method should be selected according to specific needs.

[0003] Problems with existing technologies: High energy consumption: There are many heating cable loops on site, and the control is manual, resulting in unnecessary energy waste; Inefficient statistics: Due to the heavy load, it is inconvenient to collect data such as the temperature and current of the heating belt, which is time-consuming and inefficient. Lack of communication: The heating panel is only controlled by switches, contactors and other components. In the era of unmanned and intelligent operation, there is no communication interface, which cannot meet the communication needs of the host computer and makes data aggregation difficult. Summary of the invention

[0004] The purpose of the present invention is to provide an output power regulation system and method suitable for explosion-proof and energy-saving cabinets, which can adjust the equipment load to the maximum extent according to the existing data, reduce energy consumption, unify the overall power calculation, solve the problem of statistical inefficiency, have strong data aggregation capabilities, and use PLC unified collection and centralized control.

[0005] The technical solution adopted by the present invention is as follows: An output power regulation system suitable for an explosion-proof energy-saving cabinet, comprising: On-site electric heating control system; Each of the on-site electric heating local control systems includes an electric heating control cabinet arranged on the on-site heating belt, and each of the on-site electric heating local control systems includes a plurality of heating pipelines arranged on the on-site heating belt. A single electric heating control cabinet supports the connection of a maximum of 30 heating pipelines, and one end of each of the heating pipelines is connected to a pipeline temperature sensor, and an environmental temperature sensor is arranged within the on-site range of each of the on-site electric heating local control systems; The electric heating control cabinet is composed of an explosion-proof cabinet frame and a cabinet body. The cabinet body is fixedly installed on the top of the explosion-proof cabinet frame. A touch screen is embedded on the top of the cabinet door, and grounding feedback is arranged and assembled on the inner wall of the cabinet door. The cabinet body is internally arranged with a main power circuit breaker, a power regulator, a power frequency contactor, a programmable controller PLC, a touch screen HMI, a guide rail multi-function meter, an electric heating sub-circuit leakage protector, a control transformer, a switch, a button, an indicator light, a Lora wireless receiver, a thyristor controller and a signal isolation; The thyristor controller is provided with a thyristor amplifier circuit through a three-phase trigger contact connection, and the thyristor controller is connected to all pipeline temperature sensors within the scope of the corresponding on-site electric heating local control system through a temperature control circuit node; The pipeline temperature sensor uses Lora wireless communication remote transmission to send the collected real-time pipeline temperature information to the Lora wireless receiver in the corresponding electric heating control cabinet, and the theoretical communication range of Lora wireless communication is within five kilometers.

[0006] The pipeline temperature sensor adopts PT100, the range is: -80~350℃, and magnetic adsorption temperature measurement is adopted; the pipeline temperature sensor terminal box contains lithium ion battery and capacitor, and the ambient temperature range of use is: -30~80℃.

[0007] It also includes host computers and switches; The host computer is connected to the switch via data, and the switch is connected to each on-site electric heating local control system via Ethernet data.

[0008] Also includes transformers; The transformers are respectively installed at the input end and the output end of the three-phase power system of the electric heating control cabinet; The three-phase power system of the electric heating control cabinet is provided with a switching power supply circuit, the switching power supply circuit is equipped with a 220V to 24V switching power supply, and the switching power supply circuit remotely controls the on and off of the external standby 220V control circuit through a relay.

[0009] An energy-saving box is assembled on the top of the transformer, and the energy-saving box is independently provided with a 220V power supply. The energy-saving box includes a mounting bracket fixedly installed on the top of the transformer, and a box body is fixedly welded on the top of the mounting bracket. An OLED screen is embedded in the box cover on the front of the box body, and an exhaust fan is embedded in the inner wall of the box body. A heating box is fixedly installed inside the box body, and an NTC acquisition module is installed on the outer wall of the back of the heating box and close to the exhaust fan.

[0010] The heating box is internally installed with a power module, a voltage regulating unit and a main control board, and the surface of the voltage regulating unit is spot-welded with a thyristor, an ARM main control chip, a clock crystal oscillator, a TTL and a heat sink; The voltage regulating unit has a built-in resistance-capacitance absorption circuit for absorbing transient signals and fast signals.

[0011] The regulation system is programmed using PLC programming software, including a temperature detection module, a logic judgment module, a power-on and power-off control module, and a voltage rise time function module; The voltage rise time function module uses the soft starter in conjunction with the programmable controller PLC to control the voltage growth rate when the explosion-proof energy-saving cabinet is started according to the preset voltage rise time curve.

[0012] An output power adjustment method suitable for an explosion-proof energy-saving cabinet includes a single-loop detection adjustment method and an environmental monitoring adjustment method.

[0013] The single-loop detection and adjustment method has the following specific steps: Step 1: Install a pipeline temperature sensor on each heating pipeline on site to monitor the temperature of each loop pipeline. The pipeline temperature sensor is installed in the form of a clamp; Step 2: Set the pipeline control temperature T by operating the touch screen 0 ℃,T 0 ℃ According to the design temperature adjustment, set the return temperature T 1 ℃; Step 3: When each heating pipeline is in operation, the pipeline temperature T°C of the heating pipeline is obtained through the pipeline temperature sensor; Step 4: When T < T 0 When T>T 0 +T 1 When the load equipment on the heating pipeline is stopped, the operation of the load equipment on the heating pipeline is stopped.

[0014] The environmental monitoring and adjustment method comprises the following specific steps: Step 1: An environmental temperature sensor is arranged within the field of each on-site electric heating control system, and the collected ambient temperature is used as the control standard of the thyristor; Step 2: Set the temperature adjustment parameters by operating the touch screen, such as setting the start and stop range of the heating belt temperature to -5-10℃; Step 3: Program the programmable controller PLC and divide the output interval through it, for example, divide the control into 5 levels: output power 0%, output power 25%, output power 50%, output power 75%, output power 100%; Step 4: When the ambient temperature is ≤-5℃, the output power is controlled to 100%; when -5℃<ambient temperature≤0℃, the output power is controlled to 75%; when 0℃<ambient temperature<5℃, the output power is controlled to 50%; when 5℃≤ambient temperature<10℃, the output power is controlled to 25%; when the ambient temperature is ≥10℃, the output power is controlled to 0%; Step 5: When it comes to precise pipeline control, the collection and control method tends to be pipeline temperature sensors, and the appropriate temperature is selected to adjust the output power percentage.

[0015] The technical effects achieved by the present invention are: 1. Monitor the operating status of each heating pipeline according to the measured temperature information of each pipeline temperature sensor, and adjust the output of the trigger circuit as needed to achieve protection and optimized control of the load equipment.

[0016] 2. Slow and smooth overall adjustment, no impact on the power grid and transformer due to frequent startup.

[0017] 3. The overall control is simple and intuitive, and can be visualized through the touch screen. It can also be monitored as a whole through networking, and networking can be achieved with only 485 communication.

[0018] 4. With bypass function, if there is a production stoppage, it can directly switch to the industrial frequency.

[0019] 5. Flexible use of the overall adjustment can be placed on the 220V end or the 380V end. Placing it on the 380V end can increase the power usage of the power regulator.

[0020] 6. Electric energy calculation: unified overall electric energy calculation, electric energy statistics can reach an accuracy of 0.2 level, solving the problem of statistical inefficiency.

[0021] 7. Strong scalability: It has good system scalability; the system function and capacity can be expanded by adding modules or expanding input and output points, distributed IO, etc.

[0022] 8. Strong reliability: The built-in PLC main control unit has stronger ability to adapt to harsh environments, anti-interference ability and stability compared to other control units.

[0023] 9. Energy-saving optimization algorithm: Apply energy-saving algorithm, dynamic planning, real-time adjustment, economic forecasting, and adjust equipment load and reduce energy consumption to the maximum extent according to existing data.

[0024] 10. The system can be customized: the display and functions can be slightly modified according to the site requirements to meet the needs of different users.

[0025] 11. The output power can be flexibly adjusted according to production needs, and there is no gap problem in linear regulation.

[0026] 12. When collecting the temperature of all pipelines, the data aggregation capability is strong, and PLC collects and controls uniformly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a system distribution diagram of the on-site electric heating control system provided by an embodiment of the present invention; Figure 2 is a structural diagram of an electric heating control cabinet provided by an embodiment of the present invention; Figure 3 It is a flow chart of a single-loop detection and adjustment method and an environmental monitoring and adjustment method provided by an embodiment of the present invention; Figure 4 is a schematic diagram of the installation of the energy-saving box provided in an embodiment of the present invention; Figure 5 is a schematic diagram of a combination of a transformer and an energy-saving box provided in an embodiment of the present invention; Figure 6 is a structural diagram of a heating box provided by an embodiment of the present invention; Figure 7 is a structural disassembly diagram of a heating box provided in an embodiment of the present invention; Figure 8 is a rear structural diagram of a heating box provided by an embodiment of the present invention; Fig. 9 is a schematic diagram of a main control board provided by an embodiment of the present invention; Fig.10 is a layered diagram of a heating box system provided by an embodiment of the present invention; Fig.11 It is a process flow and analysis diagram of the heating box system provided by an embodiment of the present invention.

[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Host computer; 2. Switch; 3. On-site electric heating control system; 4. Electric heating control cabinet; 401. Explosion-proof cabinet frame; 402. Cabinet; 403. Touch screen; 404. Grounding feedback; 405. SCR controller; 406. Programmable controller PLC; 407. Signal isolation; 5. Pipeline temperature sensor; 6. Heating pipeline; 7. Transformer; 8. Energy-saving box; 801. Mounting bracket; 802. Cabinet; 803. OLED screen; 804. Exhaust fan; 805. Heating box; 806. Voltage regulating unit; 807. Main control board; 808. NTC acquisition module; 809. ARM main control chip; 810. Clock crystal oscillator; 811. TTL; 812. Heat sink. DETAILED DESCRIPTION

[0029] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0030] like Figure 1 As shown, an output power regulation system suitable for explosion-proof energy-saving cabinets includes: a host computer 1, a switch 2, and an on-site electric heating control system 3; See attached Figure 1 The host computer 1 is connected to the switch 2 via data connection, and the switch 2 is connected to each on-site electric heating control system 3 via Ethernet data connection.

[0031] See attached Figure 1 Each on-site electric heating local control system 3 includes an electric heating control cabinet 4 arranged on the on-site heating belt, and each on-site electric heating local control system 3 includes a plurality of heating pipelines 6 arranged on the on-site heating belt. A single electric heating control cabinet 4 supports the connection of a maximum of 30 heating pipelines 6, and one end of each heating pipeline 6 is connected to a pipeline temperature sensor 5. An environmental temperature sensor is arranged within the on-site range of each on-site electric heating local control system 3.

[0032] See attached Figure 2 The electric heating control cabinet 4 is composed of an explosion-proof cabinet frame 401 and a cabinet body 402. The cabinet body 402 is fixedly installed on the top of the explosion-proof cabinet frame 401. A touch screen 403 is embedded on the top of the cabinet door 402, and a grounding feedback 404 is arranged and assembled on the inner wall of the cabinet door 402. The interior of the cabinet body 402 is installed with a main power circuit breaker, a power regulator, an industrial frequency contactor, a programmable controller PLC406, a touch screen HMI, a guide rail type multi-function meter, an electric heating sub-circuit leakage protector, a control transformer, a switch, a button, an indicator light, a Lora wireless receiver, a thyristor controller 405 and a signal isolation 407; the thyristor controller 405 is provided with a thyristor amplifying circuit through a three-phase trigger contact connection, and the thyristor controller 405 is connected to all pipeline temperature measuring sensors 5 within the range of the corresponding on-site electric heating local control system 3 through a temperature control circuit node.

[0033] See attached Figure 1The pipeline temperature sensor 5 uses Lora wireless communication to transmit the collected real-time pipeline temperature information to the Lora wireless receiver in the corresponding electric heating control cabinet 4, and the theoretical communication range of Lora wireless communication is within five kilometers; the pipeline temperature sensor 5 uses PT100, the range is: -80~350℃, and the magnetic adsorption temperature measurement is adopted, which is convenient for construction and installation. The terminal box of the pipeline temperature sensor 5 adopts a cast aluminum shell and an explosion-proof design. The explosion-proof mark: Ex dIICT6Gb; there are lithium-ion batteries and capacitors in the terminal box of the pipeline temperature sensor 5, and the ambient temperature range of use is: -30~80℃; the battery can be used effectively for 3~5 years; the Lora radio power: less than 100mW.

[0034] According to the above structure, the explosion-proof energy-saving cabinet integrates the indoor heating plate, which saves indoor space and can be operated nearby on site, which is convenient and fast. It is compatible with multiple controls, environmental monitoring control and single-loop monitoring control. In addition, the clamp-type temperature sensor can be used, which is easy to install and avoids opening pipes. The pipeline temperature sensor 5 sends the collected real-time pipeline temperature information to the Lora wireless receiver in the corresponding electric heating control cabinet 4 through the Lora wireless communication remote transmission mode, and then transmits the received multiple potential data to the PIC through the S485 communication of the Modbus RTU protocol in a wired manner. Finally, the PIC realizes the real-time temperature control of the PID through program logic, and finally accurately and effectively controls the power regulator to match the reasonable output power to the electrical component heat circuit, thereby realizing on-demand regulation and reducing power consumption; The thyristor amplifier circuit is used to amplify and control the input signal. The function of the thyristor controller 405 is to realize the voltage regulation function of the load. The charging speed of the capacitor is changed by adjusting the resistance, thereby adjusting the frequency of the pulse signal to realize continuous regulation of the thyristor output voltage. The operating status of each heating pipeline 6 is monitored according to the measured temperature information of each pipeline temperature sensor 5, and the output of the trigger circuit is adjusted as needed to realize protection and optimized control of the load equipment.

[0035] Also includes a transformer 7; The transformer 7 is installed at the input end and the output end of the three-phase power system of the electric heating control cabinet 4 respectively; The three-phase power system of the electric heating control cabinet 4 is provided with a switching power supply circuit, which is equipped with a 220V to 24V switching power supply, and the switching power supply circuit remotely controls the on and off of the external standby 220V control circuit through a relay.

[0036] According to the above structure, remote control is achieved through relays, and a backup power supply module is equipped to improve the reliability of the system. At the same time, a high-frequency signal input point is equipped and has a high-frequency signal input function to meet specific application requirements.

[0037] See attached Figure 4-Figure 10 An energy-saving box 8 is assembled on the top of the transformer 7. The energy-saving box 8 is independently provided with a 220V power supply. The energy-saving box 8 includes a mounting bracket 801 fixedly mounted on the top of the transformer 7. A box body 802 is fixedly welded on the top of the mounting bracket 801. An OLED screen 803 is embeddedly mounted on the front cover of the box body 802. An exhaust fan 804 is embeddedly mounted on the inner wall of the box body 802. A heating box 805 is fixedly mounted inside the box body 802. An NTC acquisition module 808 is installed on the outer wall of the back of the heating box 805 and close to the exhaust fan 804.

[0038] The heating box 805 is internally installed with a power module, a voltage regulating unit 806 and a main control board 807. The surface of the voltage regulating unit 806 is spot-welded with a thyristor, an ARM main control chip 809, a clock crystal oscillator 810, a TTL 811 and a heat sink fin 812; the voltage regulating unit 806 has a built-in RC absorption circuit.

[0039] According to the above structure, the energy-saving box 8 is a voltage-regulated output, and can only guarantee an output voltage of 220V when the output is 100%, and the output voltage in other stages is lower than 220V. In order to ensure the normal power supply of the heating panel control circuit, the energy-saving box 8 is separately set with a 220V power supply; without changing the transformer 7, the energy-saving box 8 is connected to the secondary side of the transformer 7, and the thyristor output directly adjusts the resistive load of the heating belt. At the same time, the third-generation controller is replaced, and the triggering mode is also changed to variable-cycle zero-crossing regulation, which reduces the harmonic content, has a higher matching degree with the load, and the abnormal heating of the transformer is also handled; after the energy-saving box 8 is installed on the secondary side of the transformer 7, it directly adjusts the heating belt. There are two voltage transformers in the heating panel. This type of voltage transformer is very sensitive to voltage changes and non-sinusoidal frequency waveforms, which are generally not matched with the output of the energy-saving box. Therefore, the voltage transformer is removed here, and a direct-type voltmeter is selected to directly connect to the power grid without passing through the transformer, which can avoid the burning of the voltage transformer in the heating panel; The RC absorption circuit is used to absorb transient signals and fast signals, filter out high-frequency or low-frequency signal noise, and improve efficiency. It is suitable for AC voltage regulation, dimming and AC speed regulation. It has a continuous linearity from zero voltage to power supply voltage, and realizes stepless voltage regulation. Fig.10 As shown, the heating box system board can be divided into four layers: hardware layer, acquisition layer, data layer and application layer. The hardware layer is composed of OLED screen 803, ARM main control chip 809, power module, NTC acquisition module, 808 thyristor and clock crystal oscillator 810. The acquisition layer is composed of ambient temperature measurement and pipeline temperature measurement. The data layer converts, analyzes and transmits data through serial communication, LORA, ADC / DAC and PWM technology. The application layer is divided into phase shift control, stepless voltage regulation, RC absorption and operation indication. For the power statistics of the regulation system, please refer to Table 1 below: Table 1 According to the above data statistics and diagrams, the overall power consumption shows a clear downward trend when energy-saving control is adopted.

[0040] The regulation system is written using PLC programming software, including a temperature detection module, a logic judgment module, a power on / off control module, and a voltage rise time function module; the voltage rise time function module uses a soft starter in conjunction with a programmable controller PLC406 to control the voltage growth rate when the explosion-proof energy-saving cabinet is started according to a preset voltage rise time curve, thereby reducing the starting current and achieving precise regulation and stable control of the output power of the explosion-proof energy-saving cabinet.

[0041] The working principle of the present invention is: For the specific adjustment method of the above-mentioned adjustment system, please refer to the following output power adjustment method suitable for explosion-proof energy-saving cabinets.

[0042] Please refer to Figure 3 and Fig.11 , an output power adjustment method suitable for explosion-proof energy-saving cabinets, including a single-loop detection adjustment method and an environmental monitoring adjustment method.

[0043] Single-loop detection and adjustment method, the specific steps are as follows: Step 1: Install a pipeline temperature sensor 5 on each heating pipeline 6 on site to monitor the temperature of each loop pipeline. The pipeline temperature sensor 5 is installed in the form of a clamp; Step 2: Set the pipeline control temperature T by operating the touch screen 403 0 ℃,T 0 ℃ According to the design temperature adjustment, set the return temperature T 1 ℃; Step 3: When each heating pipeline 6 is in operation, the pipeline temperature T°C of the heating pipeline 6 is obtained through the pipeline temperature sensor 5; Step 4: When T < T 0 When T>T 0 +T 1 When the load equipment on the heating pipeline 6 is stopped, the operation of the load equipment on the heating pipeline 6 is stopped.

[0044] The effect of this method is: the temperature of each pipeline is collected, and after being processed by the CPU, the thyristor adjusts the output power online, and the contactor in the control panel is uniformly controlled, which is suitable for the temperature maintenance panel; each circuit is accurately adjusted by monitoring the temperature of the single-circuit pipeline, and the explosion-proof box can be placed in the outdoor environment on site, and environmental monitoring and single-circuit monitoring are optional.

[0045] Environmental monitoring and adjustment method, the specific steps are as follows: Step 1: An environmental temperature sensor is arranged within the scope of each on-site electric heating local control system 3, and the collected ambient temperature is used as the control standard of the thyristor; Step 2: Set the temperature adjustment parameters by operating the touch screen 403, for example, set the start and stop range of the heating belt temperature to -5-10°C; Step 3: Program the programmable controller PLC406 and divide the output interval through it, for example, divide the control into 5 levels: output power 0%, output power 25%, output power 50%, output power 75%, output power 100%; Step 4: When the ambient temperature is ≤-5℃, the output power is controlled to 100%; when -5℃<ambient temperature≤0℃, the output power is controlled to 75%; when 0℃<ambient temperature<5℃, the output power is controlled to 50%; when 5℃≤ambient temperature<10℃, the output power is controlled to 25%; when the ambient temperature is ≥10℃, the output power is controlled to 0%; Step 5: When it comes to precise pipeline control, the acquisition and control method tends to be pipeline temperature sensor 5, and the appropriate temperature is selected to adjust the output power percentage.

[0046] The effect of this method is: the ambient temperature is collected, and after being processed by the CPU, the thyristor adjusts the output power online, uniformly controls the contactors in the panel, and is suitable for antifreeze panels; high-power thyristors control the total inlet, and the heating belt is overall regulated by changes in ambient temperature.

[0047] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. An output power regulation system suitable for explosion-proof energy-saving cabinets, characterized in that: include: On-site electric heating control system (3); Each of the on-site electric heating local control systems (3) includes an electric heating control cabinet (4) arranged on the on-site heating belt, and each of the on-site electric heating local control systems (3) includes a plurality of heating pipelines (6) arranged on the on-site heating belt, a single electric heating control cabinet (4) supports the connection of a maximum of 30 heating pipelines (6), and one end of each of the heating pipelines (6) is connected to a pipeline temperature sensor (5), and each of the on-site electric heating local control systems (3) is arranged with an environmental temperature sensor within the on-site range; The electric heating control cabinet (4) is composed of an explosion-proof cabinet frame (401) and a cabinet body (402), wherein the cabinet body (402) is fixedly installed on the top of the explosion-proof cabinet frame (401), a touch screen (403) is embedded on the top of the cabinet door of the cabinet body (402), and a grounding feedback (404) is arranged and assembled on the inner wall of the cabinet door of the cabinet body (402), and the cabinet body (402) is internally arranged and installed with a main power circuit breaker, a power regulator, a power frequency contactor, a programmable controller PLC (406), a touch screen HMI, a guide rail type multi-function meter, an electric heating sub-circuit leakage protector, a control transformer, a switch, a button, an indicator light, a Lora wireless receiver, a thyristor controller (405) and a signal isolation (407); The thyristor controller (405) is provided with a thyristor amplifier circuit via a three-phase trigger contact connection, and the thyristor controller (405) is connected to all pipeline temperature sensors (5) within the range of the corresponding on-site electric heating local control system (3) via a temperature control circuit node; The pipeline temperature sensor (5) uses Lora wireless communication remote transmission to send the collected real-time pipeline temperature information to the Lora wireless receiver in the corresponding electric heating control cabinet (4), and the theoretical communication range of Lora wireless communication is within five kilometers.

2. The output power regulation system suitable for explosion-proof energy-saving cabinets according to claim 1, characterized in that: The pipeline temperature sensor (5) adopts PT100, the range is: -80 ~ 350 ° C, and adopts magnetic adsorption temperature measurement; the terminal box of the pipeline temperature sensor (5) contains a lithium ion battery and a capacitor, and the ambient temperature range of use is: -30 ~ 80 ° C.

3. The output power regulation system suitable for explosion-proof energy-saving cabinets according to claim 1, characterized in that: It also includes a host computer (1) and a switch (2); The host computer (1) is data-connected to the switch (2), and the switch (2) is data-connected to each on-site electric heating local control system (3) via Ethernet.

4. The output power regulation system suitable for explosion-proof energy-saving cabinets according to claim 1, characterized in that: Also includes a transformer (7); The transformer (7) is respectively installed at the input end and the output end of the three-phase power system of the electric heating control cabinet (4); The electric heating control cabinet (4) is provided with a switching power supply circuit in the three-phase power system. The switching power supply circuit is equipped with a 220V to 24V switching power supply, and the switching power supply circuit remotely controls the on and off of an external standby 220V control circuit through a relay.

5. The output power regulation system suitable for explosion-proof energy-saving cabinets according to claim 4, characterized in that: An energy-saving box (8) is assembled on the top of the transformer (7), and the energy-saving box (8) is independently connected to a 220V power supply. The energy-saving box (8) comprises a mounting bracket (801) fixedly mounted on the top of the transformer (7), a box body (802) is fixedly welded to the top of the mounting bracket (801), an OLED screen (803) is embeddedly mounted on the front cover of the box body (802), an exhaust fan (804) is embeddedly mounted on the inner wall of the inner surface of the box body (802), a heating box (805) is fixedly mounted inside the box body (802), and an NTC acquisition module (808) is mounted on the outer wall of the back of the heating box (805) and close to the exhaust fan (804).

6. The output power regulation system suitable for explosion-proof energy-saving cabinets according to claim 5, characterized in that: The heating box (805) is internally installed with a power module, a voltage regulating unit (806) and a main control board (807); the surface of the voltage regulating unit (806) is spot-welded with a thyristor, an ARM main control chip (809), a clock crystal oscillator (810), a TTL (811) and a heat sink fin (812); The voltage regulating unit (806) has a built-in resistance-capacitance absorption circuit for absorbing transient signals and fast signals.

7. The output power regulation system suitable for explosion-proof energy-saving cabinets according to claim 1, characterized in that: The regulation system is programmed using PLC programming software, including a temperature detection module, a logic judgment module, a power-on and power-off control module, and a voltage rise time function module; The voltage rise time function module uses a soft starter in cooperation with a programmable controller PLC (406) to control the voltage increase rate when the explosion-proof energy-saving cabinet is started according to a preset voltage rise time curve.

8. An output power regulation method applicable to an explosion-proof energy-saving cabinet, used for using the output power regulation system as described in any one of claims 1 to 7, characterized in that: It includes a single-loop detection and adjustment method and an environmental monitoring and adjustment method.

9. The output power adjustment method applicable to explosion-proof energy-saving cabinets according to claim 8, characterized in that: The single-loop detection and adjustment method has the following specific steps: Step 1: Install a pipeline temperature sensor (5) on each heating pipeline (6) on site to monitor the temperature of each loop pipeline. The pipeline temperature sensor (5) is installed in the form of a clamp; Step 2: Set the pipeline control temperature T0°C by operating the touch screen (403), T0°C is adjusted according to the design temperature, and the hysteresis temperature T1°C is set; Step 3: When each heating pipeline (6) is in operation, the pipeline temperature T°C of the heating pipeline (6) is obtained through the pipeline temperature sensor (5); Step 4: When T<T0, the load device on the heating pipeline (6) continues to output and operate; when T>T0+T1, the load device on the heating pipeline (6) stops operating.

10. The output power adjustment method applicable to explosion-proof energy-saving cabinets according to claim 8, characterized in that: The environmental monitoring and adjustment method comprises the following specific steps: Step 1: Each on-site electric heating control system (3) is equipped with an environmental temperature sensor within the field, and the collected environmental temperature is used as the control standard of the thyristor; Step 2: Setting temperature adjustment parameters by operating the touch screen (403), for example, setting the start and stop range of the heating belt temperature to -5-10°C; Step 3: Program the programmable controller PLC (406) and divide the output intervals therethrough, for example, dividing the control into 5 levels: output power 0%, output power 25%, output power 50%, output power 75%, and output power 100%; Step 4: When the ambient temperature is ≤-5℃, the output power is controlled to 100%; when -5℃<ambient temperature≤0℃, the output power is controlled to 75%; when 0℃<ambient temperature<5℃, the output power is controlled to 50%; when 5℃≤ambient temperature<10℃, the output power is controlled to 25%; when the ambient temperature is ≥10℃, the output power is controlled to 0%; Step 5: When it comes to precise pipeline control, the temperature of each pipeline is selected. The acquisition and control method tends to be the pipeline temperature sensor (5), and the appropriate temperature is selected to adjust the output power percentage.

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