A feeder automatic temperature control device and a temperature control method

Abstract

The present application relates to a kind of feeder self-control temperature device and temperature control method, self-control temperature device includes windproof room, set to the outer periphery of feeder, multiple heating module, set to the inner wall of windproof room, spacing exists between heating module and the bunker of feeder, hot air blower, connect to windproof room, to send hot air into windproof space;Temperature sensor is used to detect ambient temperature, heating module temperature and bunker temperature, control unit is connected to temperature sensor, heating module and hot air blower, when bunker temperature value is less than first temperature threshold, control unit according to ambient temperature and heating module temperature, control the opening and closing quantity of heating module and the opening and closing of hot air blower.The present application is aimed at various different environmental conditions, hierarchical zoning automatic control heating mode, to adjust temperature, ensure that the temperature in feeder is in the required range, coal freezing can be avoided, improve transport efficiency.

Description

Technical Field

[0001] This invention relates to the field of antifreeze and heat preservation technology, and particularly to a self-temperature control device and temperature control method for a feeder. Background Technology

[0002] In coal transportation, activated feeders are typically used to handle the critical transfer of coal from silos to belt conveyors. However, in some regions with extremely harsh winter climates, outdoor temperatures can remain below -5°C for extended periods. Unobstructed air convection occurs around the ventilation openings at the bottom of the silos, causing the activated feeders (iron structure, with a heat transfer coefficient of 61 W / m³) to overheat. K) Exposure to a “open-air” low-temperature environment can cause the coal inside the feeder to freeze and the discharge to be obstructed, which can not guarantee the stable operation of the coal transportation system.

[0003] Currently, antifreeze measures for activated feeders typically involve attaching traditional insulation devices to the feeder casing with a rigid connection. This can isolate the feeder from external ambient temperatures to some extent, ensuring the temperature of the coal inside the feeder's hopper. However, this method has two drawbacks. First, the rigidly fixed insulation device can hinder the normal vibration of the feeder (vibration discharge), leading to increased equipment failure frequency and affecting coal transportation. Second, under long-term vibration, the insulation device is prone to detachment, compromising its insulation effect and requiring frequent maintenance, thus reducing coal transportation efficiency.

[0004] Therefore, it is necessary to design a better antifreeze system for the feeder to solve the above problems. Summary of the Invention

[0005] This invention provides a self-temperature control device and method for a feeder. The windproof chamber blocks external cold air from directly blowing onto the feeder, increasing the temperature within the windproof space. The heating module is installed on the inner wall of the windproof chamber, with a gap between the heating module and the hopper. This allows heat to radiate to the hopper and transfer it to the coal inside, preventing the coal from freezing and affecting the discharge, while also not affecting the feeder's vibration performance. The module will not detach during hopper vibration, reducing maintenance frequency. A hot air blower assists in heating, rapidly increasing the temperature within the windproof space. The combined effect of the windproof chamber, heating module, and hot air blower ensures the temperature inside the feeder's hopper remains within the required range, preventing the coal from freezing.

[0006] This invention provides a self-temperature control device for a feeder, comprising: A windproof chamber is provided on the outer periphery of the feeder, and a windproof space is formed inside the windproof chamber; Multiple heating modules are disposed on the inner wall of the windproof chamber, and there is a gap between the heating modules and the feeder's hopper; A hot air blower is installed outside the windproof chamber and connected to the windproof space to deliver hot air into the windproof space; Temperature sensors are respectively installed in the external environment, on the heating module, and inside the hopper, for detecting the ambient temperature, the temperature at the heating module, and the temperature inside the hopper. The control unit is connected to the temperature sensor, the heating module, and the hot air blower. When the temperature value inside the hopper is less than a first temperature threshold, the control unit controls the number of heating modules that are turned on and off and the hot air blower that are turned on and off according to the ambient temperature and the temperature at the heating module.

[0007] In one embodiment, the heating module is equipped with a heat tracing cable, which is connected to an external temperature controller. The heat is generated by the heat tracing cable, and the heat is radiated to the silo through the heating module and transferred to the coal in the silo.

[0008] In one embodiment, the heat tracing cable is provided with multiple channels, each channel of the heat tracing cable is independently set and connected to the temperature controller. When the temperature controller detects an abnormality in the loop current of a certain channel of the heat tracing cable, it triggers an audible and visual alarm.

[0009] In one embodiment, the heating module is provided with a fireproof layer, a heat insulation layer, a heat tracing tape, and a heat-conducting plate from the outside to the inside, with the heat-conducting plate facing the side wall of the silo.

[0010] In one embodiment, the heating module is kept at a distance of 400-600 mm from the hopper.

[0011] In one embodiment, the windproof chamber includes a frame and walls mounted on the frame, the frame being fixed to the bottom plate of the silo, and the top of the walls being connected to a roof.

[0012] In one embodiment, the windproof chamber includes a frame, and a plurality of heating modules are evenly arranged along the circumference of the windproof chamber. The plurality of heating modules are spliced ​​together to form a wall and are fixed to the frame.

[0013] In one embodiment, the hot air blower is fixed to the air duct, which is inserted into the through hole of the windproof chamber and communicates with the windproof space.

[0014] A temperature control method based on the above-mentioned feeder self-temperature control device includes: Real-time monitoring of external ambient temperature, temperature at each of the heating modules, and temperature inside the silo; When the temperature inside the silo is less than the first temperature threshold, determine whether to start the heating module and the hot air blower based on the ambient temperature. When the third temperature threshold is less than or equal to the ambient temperature and less than the second temperature threshold, some heating modules are activated to perform basic heating and insulation. When the fourth temperature threshold is less than or equal to the ambient temperature and less than the third temperature threshold, all heating modules are activated for full-power heating. When the ambient temperature is less than the fourth temperature threshold, all the heating modules and the hot air blower are activated for strong heating. Heating shall be stopped when the temperature inside the silo is greater than or equal to the first temperature threshold and / or the ambient temperature is greater than or equal to the second temperature threshold.

[0015] In one embodiment, the heating modules are evenly arranged around the circumference of the windproof chamber, and the temperature at each heating module is monitored individually. Among them, when the third temperature threshold is less than or equal to the ambient temperature and less than the second temperature threshold, the step of activating some heating modules for basic heating and insulation also includes: When the third temperature threshold is less than or equal to the ambient temperature and less than the second temperature threshold, the first heating module with the interval setting is activated to perform heating. After the first heating module has been heating for a set time, it is determined whether additional heating is needed based on the temperature at each of the first heating modules. If the temperature at the first heating module is lower than the fifth temperature threshold, then the second heating module adjacent to the first heating module is activated to provide supplementary heating. If the temperature at the first heating module is greater than the sixth temperature threshold, the second heating module is turned off first. When the temperature at the first heating module is greater than the seventh temperature threshold, the first heating module is turned off. The temperature of the heating module is monitored in real time. When the temperature of any heating module is less than or equal to the fifth temperature threshold, the above steps are repeated.

[0016] Compared with the prior art, the advantages of this invention are as follows: The windproof chamber surrounding the feeder blocks direct cold air from blowing onto it, ensuring the temperature inside the windproof space is higher than the ambient temperature, thus reducing the heating load. Furthermore, heating modules are installed on the inner wall of the windproof chamber, with a gap between the heating modules and the hopper, preventing direct contact and thus avoiding impact on the feeder's vibration performance. This also prevents the heating modules from detaching during hopper vibration, reducing maintenance frequency and improving coal transport efficiency. The heating modules radiate heat to the hopper and transfer it to the coal inside, preventing the coal from freezing and affecting discharge. This invention is suitable for coal transportation in various low-temperature environments. A hot air blower is installed outside the windproof chamber for auxiliary heating, which can quickly raise the temperature inside the windproof space. The windproof chamber, heating module, and hot air blower work together to ensure that the temperature inside the feeder's hopper is within the required range, preventing the coal from freezing. Furthermore, the control unit of this invention can automatically control the opening and closing of the heating module and / or hot air blower based on the detected external ambient temperature and the temperature at the heating module. It can also automatically control the heating mode in different grades and zones for various environmental conditions to adjust the temperature, ensuring the temperature inside the feeder and preventing the coal from freezing. Attached Figure Description

[0017] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the structure of the automatic temperature control device for the feeder of the present invention; Figure 2 This is a schematic diagram of the windproof chamber frame in the self-temperature control device of the feeder of the present invention; Figure 3 This is a schematic diagram of the structure of the windproof chamber wall in the self-temperature control device of the feeder of the present invention; Figure 4 This is a schematic diagram of the built-in temperature sensors in each heating module of the automatic temperature control device for the feeder of the present invention; Figure 5 This is a schematic diagram of the heating module in the self-temperature control device of the feeder of the present invention; Figure 6 This is a schematic diagram of the hot air blower in the self-temperature control device of the feeder of the present invention; Figure 7 This is a flowchart of the temperature control method of the automatic temperature control device for the feeder of the present invention.

[0019] Figure label: 1. Windproof room; 11. Frame; 12. Wall; 13. Windproof space; 14. Roof; 15. Support frame; 2. Heating module; 21. Fireproof layer; 22. Insulation layer; 23. Heating tape; 24. Heat-conducting plate; 3. Hot air blower; 31. Air duct; 32. Heat pipe; 4. Feeder; 41. Hopper; 5. First temperature sensor; 6. Second temperature sensor; 7. Audible and visual alarm. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0022] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0023] like Figure 1 and Figure 2 As shown, the present invention provides a self-regulating temperature control device for a feeder, including a windproof chamber 1 disposed around the feeder 4, multiple heating modules 2 disposed on the inner wall of the windproof chamber 1, and a hot air blower 3 disposed outside the windproof chamber 1. The windproof chamber 1 surrounds the feeder 4, forming a windproof space 13 within it. By enclosing the feeder 4 with the windproof chamber 1, direct cold air from the outside can be blocked from blowing onto the feeder 4, making the temperature inside the windproof space 13 higher than the external ambient temperature, thus reducing the heating load.

[0024] Multiple heating modules 2 are installed on the inner wall of the windproof chamber 1. There is a gap between the heating modules 2 and the feeder 4's hopper 41, ensuring that the heating modules 2 do not directly contact the hopper 41. This prevents the heating modules 2 from affecting the vibration performance of the feeder 4 and from falling off when the hopper 41 vibrates, reducing maintenance frequency and improving coal transportation efficiency. The heating modules 2 generate heat and radiate it to the hopper 41, transferring it to the coal inside and preventing the coal from freezing and affecting discharge. This design is suitable for coal transportation in various low-temperature environments.

[0025] A hot air blower 3 is installed outside the windproof chamber 1. The hot air blower 3 is connected to the windproof chamber 1 through a heat-resistant air duct 31, which is inserted into the through hole (observation hole) of the windproof chamber 1 and communicates with the windproof space 13. When the external ambient temperature is extremely low (less than -15℃), the hot air blower 3 delivers hot air into the windproof space 13 to assist in heating and quickly raise the temperature inside the windproof space 13. This invention, through the combined action of the windproof chamber 1, the heating module 2, and the hot air blower 3, can ensure that the temperature inside the feeder 4's hopper 41 is within the required range, preventing the coal inside the hopper 41 from freezing. like Figure 4 As shown, a first temperature sensor 5 is installed in the external environment to detect the external ambient temperature, and a second temperature sensor 6 is installed on each heating module 2 to detect the temperature at the heating module 2. A third temperature sensor (not shown) is also installed inside the silo 41 to detect the temperature inside the silo 41, i.e., the temperature of the coal, to ensure that the temperature inside the silo 41 is not lower than 0°C and to prevent the coal from freezing. In this embodiment, the first temperature sensor 5, the second temperature sensor 6, and the third temperature sensor are PT100 sensors.

[0026] The feeder's self-temperature control device also includes a control unit, which is connected to the first temperature sensor 5, the second temperature sensor 6, the third temperature sensor, each heating module 2, and the hot air blower 3. When the temperature inside the hopper 41 is lower than the first temperature threshold, the control unit controls the number of heating modules 2 that are turned on and off, and the hot air blower 3 that are turned on and off, based on the ambient temperature and the temperature at the heating modules. The first temperature threshold can be set to 0-5℃. A temperature above 0℃ inside the hopper 41 is sufficient to prevent the coal from freezing. Setting the first temperature threshold to 0-5℃ as needed ensures that the coal does not freeze without requiring excessive heating and causing heat redundancy. This invention can automatically control the heating mode in stages and zones for various environmental conditions to adjust the temperature, maintain the temperature inside the feeder 4, and prevent the coal from freezing.

[0027] like Figures 1 to 3 As shown, in one embodiment, the windproof chamber 1 includes a frame 11, and multiple heating modules 2 are evenly arranged around the circumference of the windproof chamber 1. The multiple heating modules 2 are spliced ​​together to form a wall 12, and are fixed to the frame 11 by a bracket 15. The wall 12 is obtained by splicing the heating modules 2. The modular design is convenient for disassembly and assembly, and also saves the need for the wall 12 itself.

[0028] In this embodiment, there are 12 heating modules 2. The windproof chamber 1 is square, with 2 heating modules 2 on each side spliced ​​together and fixed to the frame 11.

[0029] In another embodiment, the windproof chamber 1 includes a frame 11 and a wall 12 mounted on the frame 11. The frame 11 is fixed to the bottom plate of the silo 41, and the top of the wall 12 is connected to a roof 14. In this embodiment, the top of the wall 12 is connected to the roof 14 using sliding strips and bolts, providing wind resistance and preventing resonance with the feeder 4. In this embodiment, the heating module 2 is attached to the inner surface of the wall 12.

[0030] By blocking the cold air from entering the feeder 4 through the windproof chamber 1 at the ventilation opening of the hopper 41, the ambient temperature inside the windproof space 13 is 8-12℃ higher than the external ambient temperature, thus reducing the heating load.

[0031] like Figure 1 and Figure 5 As shown, in one embodiment, the heating module 2 is provided with a heating cable 23, and the heating cable 23 is connected to an external temperature controller. The temperature controller controls the heating cable 23 to heat up or stop heating. The heating cable 23 generates heat, and the heat is radiated to the silo 41 through the heating module 2 and transferred to the coal in the silo 41.

[0032] In a preferred embodiment, the heat tracing cable 23 is provided with multiple channels, each of which is independently set and connected to a temperature controller. When the temperature controller detects an abnormality in the loop current of a certain heat tracing cable 23, it triggers the audible and visual alarm 7.

[0033] Each heating module 2 is provided with a fireproof layer 21, an insulation layer 22, a heating tape 23, and a heat-conducting plate 24 from the outside to the inside. The heat-conducting plate 24 is directly opposite the side wall of the hopper 41. In this embodiment, the fireproof layer 21 is a silicone fireproof cloth, and the insulation layer 22 is a polyurethane insulation layer. The fireproof layer 21 and the insulation layer 22 can prevent the heat in the windproof space 13 from being lost to the outside, and the heat utilization rate is greater than 85%. The heat-conducting plate 24 is an aluminum plate, which can directionally transfer the heat of the heating tape 23 to the hopper 41 of the feeder 4, and then transfer it to the coal inside the hopper 41 through the iron shell of the hopper 41.

[0034] like Figure 1 As shown, the heating module 2 is disposed on the inner wall of the windproof chamber 1 and is spaced apart from the hopper 41. The heating module 2 does not directly contact the hopper 41, thus not affecting the vibration performance of the feeder 4, and preventing the heating module 2 from falling off when the hopper 41 vibrates, reducing maintenance frequency and improving coal transportation efficiency. In this embodiment, the heating module 2 maintains a distance of 400-600mm from the hopper 41, generally 500±5mm.

[0035] like Figure 6As shown, the hot air blower 3 is fixed to the heat-resistant air duct 31, which is inserted into the through hole (observation hole) of the windproof chamber 1, directly delivering hot air into the windproof space 13 to achieve auxiliary heating at extreme low temperatures. The heat-conducting pipe 32 of the hot air blower 3 is made of copper, ensuring a heat exchange efficiency of up to 401 W / (m·K). The heat transfer medium is heat transfer oil, ensuring a heating temperature above 100°C. The hot air is blown into the windproof space 13 by the hot air blower 3, achieving a rapid heating effect.

[0036] This invention, through the combined action of the windproof chamber 1, the heating module 2, and the hot air blower 3, can ensure that the temperature inside the feeder 4's hopper 41 is within the required range, preventing the coal inside the hopper 41 from freezing. Furthermore, the design of the windproof chamber 1 can block external cold air from blowing directly onto the feeder 4, reducing the heating load. Moreover, it can automatically control graded and zoned heating based on the external ambient temperature, the temperature at the heating module 2, and the temperature inside the hopper 41, achieving fully automatic and precise operation of the feeder 4 for heat preservation.

[0037] like Figure 7 As shown, the present invention also provides a temperature control method based on the above-mentioned self-temperature control device of the feeder 4, which includes the following steps.

[0038] The system monitors the external ambient temperature, the temperature at each heating module 2, and the temperature inside the hopper 41 in real time. Specifically, a first temperature sensor 5 located in the external environment detects the ambient temperature, a second temperature sensor 6 located at each heating module 2 detects the temperature at the heating module 2 (in this embodiment, each heating module 2 is equipped with one second temperature sensor 6), and a third temperature sensor located inside the hopper 41 detects the temperature inside the hopper 41. Each temperature sensor sends the detected temperature value to the control unit in real time. The control unit automatically controls the heating module 2 and the hot air blower 3 to operate based on the temperature values ​​and a preset control program, thereby regulating the temperature.

[0039] When the temperature inside the hopper 41 is less than the first temperature threshold, the decision to activate the heating module 2 and the hot air blower 3 is based on the ambient temperature. In this embodiment, the first temperature threshold can be set to 0-5℃. A temperature greater than 0℃ inside the hopper 41 is sufficient to prevent the coal from freezing. Setting the first temperature threshold to 0-5℃ ensures that the coal does not freeze without requiring excessive heating and avoiding heat redundancy. When the temperature inside the hopper 41 is greater than the first temperature threshold, it indicates that the temperature inside the feeder 4 is sufficient, and no further heating is needed; therefore, the heating system does not need to be activated.

[0040] If the ambient temperature is greater than or equal to the second temperature threshold, the system is in standby mode, all heating modules 2 and hot air blowers 3 remain off, and only the individual temperature sensors monitor operation in real time. In this embodiment, the second temperature threshold can be set to -5℃. At this time, the external ambient temperature is not lower than -5℃, and under the heat preservation effect of the windproof chamber 1, the temperature inside the silo 41 can be maintained above 0℃, so the heating system does not need to be started.

[0041] When the third temperature threshold is less than or equal to the ambient temperature but less than the second temperature threshold, the partial heating module 2 is activated for basic heating and insulation. In this embodiment, the third temperature threshold is set to -10℃. When the ambient temperature is between -10℃ and -5℃, the partial heating module 2 is activated to heat the material, thus ensuring that the temperature inside the silo 41 is above 0℃.

[0042] When the fourth temperature threshold is less than or equal to the ambient temperature but less than the third temperature threshold, all heating modules 2 are activated for full-power heating. In this embodiment, the fourth temperature threshold is set to -15°C. When the ambient temperature is between -15°C and -10°C, the heating load of some heating modules 2 is insufficient. At this time, all heating modules 2 are activated for full-power heating to quickly raise the temperature inside the silo 41 to above 0°C.

[0043] When the ambient temperature is below the fourth temperature threshold, all heating modules 2 and the hot air blower 3 are activated for strong heating. Specifically, when the ambient temperature is below -15℃, and the external weather is extremely cold, all heating modules 2 are activated, and the hot air blower 3 is activated for auxiliary heating; both work together to achieve strong heating. When the ambient temperature is -15℃, and the external weather is extremely cold, the coal is prone to freezing. Therefore, rapid heating is required to raise the temperature of the hopper 41, reduce the time the coal is in a low-temperature environment, and prevent freezing.

[0044] Heating is stopped when the temperature inside the silo 41 is ≥ the first temperature threshold and / or the ambient temperature is ≥ the second temperature threshold. When the temperature inside the silo 41 is greater than 0℃, or the ambient temperature is greater than -5℃, the temperature of the coal inside the silo 41 can be maintained above 0℃ without freezing. Heating is stopped at this time to reduce power consumption.

[0045] This invention sets different temperature thresholds, and the control unit compares the temperature detected by the temperature sensor with the temperature threshold to control the opening and closing of each heating module 2 and hot air blower 3. This enables graded and zoned automatic temperature control, which can ensure that the temperature in the silo 41 reaches the set requirements and prevent the coal from freezing, while also avoiding overheating and heat redundancy, thus reducing the heating load.

[0046] In one embodiment, the heating modules 2 are evenly arranged around the windproof chamber 1, the temperature of each heating module 2 is monitored individually by a separate second temperature sensor 6, and each heating module 2 is controlled to open and close by an independent control loop.

[0047] In the above steps, the step of activating partial heating module 2 for basic heating and insulation when the third temperature threshold is less than or equal to the ambient temperature and less than the second temperature threshold also includes: When the third temperature threshold is less than or equal to the ambient temperature but less than the second temperature threshold, the first heating module 2, with its interval settings, is activated for heating. In this embodiment, the 12 heating modules 2 are sequentially numbered as 1, 2, ..., 12, with odd-numbered heating modules 2 designated as the first heating module 2 and even-numbered heating modules 2 designated as the second heating module 2, adjacent to the first heating module 2. When the ambient temperature is between -10℃ and -5℃, the first heating module 2 is activated for heating. The interval heating ensures uniform temperature within the windproof space 13 while reducing the heating load.

[0048] After the first heating module 2 has been heating for a set time (10 minutes), it is determined whether additional heating is needed based on the temperature at each of the first heating modules 2.

[0049] If the temperature at the first heating module 2 is lower than the fifth temperature threshold, the second heating module 2 adjacent to the first heating module 2 is activated for supplementary heating. In this embodiment, the fifth temperature threshold is set to 20°C. If the temperature at the first heating module 2 still does not reach 20°C after heating for 10 minutes, it is determined that the heating is insufficient. At this time, one or two second heating modules 2 adjacent to the first heating module 2 are automatically activated for supplementary heating. For example, if the temperature at the 3rd heating module 2 is detected to be lower than 20°C, the 2nd and 4th heating modules 2 are activated for enhanced heating.

[0050] If the temperature at the first heating module 2 exceeds the sixth temperature threshold, the second heating module 2 is shut down first. When the temperature at the first heating module 2 exceeds the seventh temperature threshold, the first heating module 2 is shut down. In this embodiment, the sixth temperature threshold is set to 25°C, and the seventh temperature threshold is set to 30°C. After supplementary heating, if the temperature at the first heating module 2 is detected to be greater than 25°C, the second heating module 2 is shut down first. Then, the temperature at the first heating module 2 is monitored. When the temperature at the first heating module 2 is detected to be greater than 30°C, the first heating module 2 in this circuit is shut down, and the circuit enters the heat preservation mode.

[0051] The temperature of each heating module 2 is monitored in real time. When the temperature of any heating module 2 is less than or equal to the fifth temperature threshold, the above steps are repeated.

[0052] For the windward side, the material hopper 41 of the feeder 4 cools down faster and heats up slower, while for the leeward side, it heats up faster and cools down slower. Therefore, this invention controls each heating module 2 individually according to the above process, and can flexibly adjust for different heating or cooling rates, making it more intelligent and more in line with actual site conditions. The separate control of each zone is also more economical.

[0053] During the heating process described above, the temperature inside the hopper 41 is monitored in real time. If the temperature inside the hopper 41 exceeds the first temperature threshold, the system stops heating.

[0054] In one embodiment, the start and stop of the hot air blower 3 are controlled according to the ambient temperature. When the ambient temperature is lower than the fourth temperature threshold (-15°C), the hot air blower 3 automatically starts and blows hot air into the windproof space 13. When the ambient temperature rises to greater than or equal to -15°C, or when the temperature inside the hopper 41 is greater than the first temperature threshold (5°C), the hot air blower 3 automatically stops.

[0055] In this invention, each heating module 2 is individually connected to a temperature controller, and the multiple heating cables 23 within each heating module 2 are also independently configured and connected to the temperature controller separately. When the temperature controller detects an abnormal current in any of the heating cables 23, it triggers an audible and visual alarm 7 within 15 seconds. The remaining heating cables 23 continue to operate, preventing heating interruption. The corresponding circuit remains in an alarm state until the fault is resolved; it can be manually or automatically reset after repair.

[0056] The temperature control method of the present invention also has an over-temperature protection. When any temperature sensor detects that the temperature of any area is greater than 60°C, the main power supply is immediately cut off to prevent overheating and burnout.

[0057] This invention, by setting different temperature thresholds, allows the control unit to compare the temperature detected by the temperature sensor with the temperature threshold, thereby controlling the opening and closing of each heating module 2 and the hot air blower 3. This enables graded and zoned automatic temperature control, ensuring that the temperature inside the silo 41 reaches the set requirements, preventing coal freezing, while also avoiding overheating and heat redundancy, thus reducing the heating load. Each temperature threshold can be adjusted according to actual conditions. Specific Implementation Taking a certain unit's activated feeder 4 as an example, the dimensions of the windproof chamber 1 are 4500mm×4000mm×2000mm; there are a total of 12 heating modules 2, with 3 modules arranged on each side, each module has 3 built-in 5m long heat tracing cables 23, and a total power of 4500W; the intelligent control includes 1 set of explosion-proof control cabinet and 14 PT100 sensors (12 are set in the heating module 2, 1 is set in the external environment, and 1 is set in the silo 41); the auxiliary heating is 15kW explosion-proof hot air blower 3.

[0059] Under extreme low temperatures of -13.5℃ and wind speeds of 15m / s (easterly winds from the northeast), the measured temperature inside windproof chamber 1 was -2.3℃. After 30 minutes of operation, the temperature inside silo 41 rose to 0.5℃, and stabilized at 7.2℃ after one hour. The coal did not freeze, and the discharge rate remained stable at 4000t / h (rated value).

[0060] When one of the heating cables 23 of the two heating modules 2 is disconnected, the temperature controller will trigger the audible and visual alarm 7 within 15 seconds. The other two heating cables 23 will continue to work normally, and the temperature inside the silo 41 can be maintained at 6.8℃. The system will automatically recover after the heating cable 23 is replaced after 2 hours.

[0061] Through practical application, the self-temperature control device and method of the feeder 4 of this invention achieve closed-loop temperature control, resulting in significant energy savings. During 120 days of winter operation, the total power consumption of a single feeder 4 is approximately 5400 kWh, which is 58.3% more energy-efficient than the traditional electric heating system's 12960 kWh, with a heat utilization rate of ≥85%. It also features automatic temperature control, tiered start-up, and fault alarms, eliminating the need for manual on-site monitoring. The entire unit is detachable, allowing for removal during summer, extending its service life to 12 years.

[0062] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A self-temperature control device for a feeder, characterized in that, include: A windproof chamber is provided on the outer periphery of the feeder, and a windproof space is formed inside the windproof chamber; Multiple heating modules are disposed on the inner wall of the windproof chamber, and there is a gap between the heating modules and the feeder's hopper; A hot air blower is installed outside the windproof chamber and connected to the windproof space to deliver hot air into the windproof space; Temperature sensors are respectively installed in the external environment, on the heating module, and inside the hopper, for detecting the ambient temperature, the temperature at the heating module, and the temperature inside the hopper. The control unit is connected to the temperature sensor, the heating module, and the hot air blower. When the temperature value inside the hopper is less than a first temperature threshold, the control unit controls the number of heating modules that are turned on and off and the hot air blower that are turned on and off according to the ambient temperature and the temperature at the heating module.

2. The feeder self-temperature control device according to claim 1, characterized in that, The heating module is equipped with a heat tracing cable, which is connected to an external temperature controller. The heat is generated by the heat tracing cable and radiated through the heating module to the silo and then transferred to the coal in the silo.

3. The feeder self-temperature control device according to claim 2, characterized in that, The heat tracing cable has multiple channels, each channel is independently set and connected to the temperature controller. When the temperature controller detects an abnormality in the loop current of a certain heat tracing cable, it triggers an audible and visual alarm.

4. The feeder self-temperature control device according to claim 2, characterized in that, The heating module is provided with a fireproof layer, a heat insulation layer, a heat tracing tape, and a heat conduction plate from the outside to the inside, with the heat conduction plate facing the side wall of the silo.

5. The feeder self-temperature control device according to claim 1, characterized in that, The heating module is kept at a distance of 400-600mm from the hopper.

6. The feeder self-temperature control device according to claim 1, characterized in that, The windproof chamber includes a frame and walls installed on the frame. The frame is fixed to the bottom plate of the silo, and the top of the walls is connected to a roof.

7. The feeder self-temperature control device according to claim 1, characterized in that, The windproof chamber includes a frame, and multiple heating modules are evenly arranged along the circumference of the windproof chamber. The multiple heating modules are spliced ​​together to form a wall and are fixed to the frame.

8. The feeder self-temperature control device according to claim 1, characterized in that, The hot air blower is fixed to the air duct, which is inserted into the through hole of the windproof chamber and connected to the windproof space.

9. A temperature control method based on the feeder self-temperature control device according to claim 1, characterized in that, include: Real-time monitoring of external ambient temperature, temperature at each of the heating modules, and temperature inside the silo; When the temperature inside the silo is less than the first temperature threshold, determine whether to start the heating module and the hot air blower based on the ambient temperature. When the third temperature threshold is less than or equal to the ambient temperature and less than the second temperature threshold, some heating modules are activated to perform basic heating and insulation. When the fourth temperature threshold is less than or equal to the ambient temperature and less than the third temperature threshold, all heating modules are activated for full-power heating. When the ambient temperature is less than the fourth temperature threshold, all the heating modules and the hot air blower are activated for strong heating. Heating shall be stopped when the temperature inside the silo is greater than or equal to the first temperature threshold and / or the ambient temperature is greater than or equal to the second temperature threshold.

10. The temperature control method according to claim 9, characterized in that, The heating modules are evenly arranged around the circumference of the windproof chamber, and the temperature at each heating module is monitored individually. Among them, when the third temperature threshold is less than or equal to the ambient temperature and less than the second temperature threshold, the step of activating some heating modules for basic heating and insulation also includes: When the third temperature threshold is less than or equal to the ambient temperature and less than the second temperature threshold, the first heating module with the interval setting is activated to perform heating. After the first heating module has been heating for a set time, it is determined whether additional heating is needed based on the temperature at each of the first heating modules. If the temperature at the first heating module is lower than the fifth temperature threshold, then the second heating module adjacent to the first heating module is activated to provide supplementary heating. If the temperature at the first heating module is greater than the sixth temperature threshold, the second heating module is turned off first. When the temperature at the first heating module is greater than the seventh temperature threshold, the first heating module is turned off. The temperature of the heating module is monitored in real time. When the temperature of any heating module is less than or equal to the fifth temperature threshold, the above steps are repeated.

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