Auxiliary heating device for removing ice on power line

Abstract

The invention relates to the technical field of power line protection, in particular to a power line ice coating removal auxiliary heating device which comprises a bottom plate and a protection plate, a deicing structure is arranged above the bottom plate, and the deicing structure comprises a removal mechanism and an auxiliary mechanism. And the removing mechanism comprises an electric telescopic rod, a first connecting plate, a moving plate, a telescopic rod and a bearing plate, and one end of the electric telescopic rod is connected with one side of the first connecting plate. Heating equipment of the auxiliary mechanism and an air collecting cover synchronously blow hot air to melt small ice particles, the pain point of long time consumption caused by pure heating ice melting is solved, an electric telescopic rod flexibly adjusts the positions of a moving wheel, an ice breaking gear and a scraper blade, and a spring buffer structure of the moving wheel is matched, so that the auxiliary mechanism can adapt to electric power circuits with different diameters; the angle of the scraper blade can be adjusted through the threaded rod, and the adaptability to lines of different specifications is further improved.

Description

Technical Field

[0001] This invention relates to the field of power line protection technology, specifically to an auxiliary heating device for removing ice from power lines. Background Technology

[0002] Power lines are the core backbone of the power system, bearing the heavy responsibility of transmitting electrical energy from the generation end to the consumption end. Their safe and stable operation is directly related to industrial production, people's livelihood, and public safety. Common power lines mainly include overhead lines and cable lines. In cold and humid regions, when the ambient temperature drops below 0°C and the air humidity reaches above 80%, supercooled water droplets or frost will continuously adhere to the surface of the conductors, gradually forming ice. Therefore, auxiliary heating devices are needed to remove the ice.

[0003] Existing de-icing auxiliary heating devices typically rely on the collaboration between the heating module and the electronic control system to achieve precise heating through electronic components such as temperature sensors and controllers. However, in actual use, they lack mechanically assisted ice-breaking structures and rely solely on heat to melt thick ice layers, which is time-consuming, inefficient, and difficult to meet emergency de-icing needs. Summary of the Invention

[0004] The purpose of this invention is to provide an auxiliary heating device for clearing ice from power lines, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an auxiliary heating device for removing ice from power lines, comprising a base plate and a protective plate, wherein an ice removal structure is provided above the base plate;

[0006] The de-icing structure includes a clearing mechanism and an auxiliary mechanism;

[0007] The cleaning mechanism includes an electric telescopic rod, a connecting plate one, a movable plate, a telescopic rod, and a support plate. One end of the electric telescopic rod is connected to one side of the connecting plate one, the top of the connecting plate one is connected to the bottom of the movable plate, the other side of the connecting plate one is connected to one end of the telescopic rod, and the other end of the telescopic rod is connected to one side of the support plate. A movable wheel is rotatably connected to the inner side of the support plate. A fixed plate is fixedly installed at one end of the connecting plate one, and an installation plate is fixedly installed at one end of the fixed plate. A drive motor is fixedly installed at the top of the installation plate, and an ice-breaking gear is fixedly installed at the output end of the drive motor. A connecting plate two is fixedly installed at the other end of the connecting plate one, and a rotating rod is rotatably connected to the inner side of the connecting plate two. A movable plate is fixedly installed on the outer wall of the rotating rod, a scraper is fixedly installed at one end of the movable plate, and a rotating plate is fixedly installed on the top of the movable plate. A threaded rod is threadedly connected to the inner wall of the rotating plate.

[0008] Preferably, there are four electric telescopic rods, which are symmetrically distributed on the inner walls of the two protective plates. There are two connecting plates, which are symmetrically distributed on one end of the four electric telescopic rods. This allows for quick and convenient adjustment of the positions of the moving wheels, ice-breaking gears, and scrapers, thereby enabling better cleaning operations.

[0009] Preferably, the bottom of the base plate has a movable groove, the top of the movable plate is slidably connected to the inner wall of the movable groove, and there are several movable wheels, which are symmetrically distributed on one side of the two connecting plates. A spring is fixedly installed between one side of the bearing plate and one side of the connecting plate, so as to quickly and conveniently remove ice from cables of different specifications, thereby enabling better use.

[0010] Preferably, there are four ice-breaking gears, which are symmetrically distributed at one end of the two mounting plates. There are two scrapers, which are symmetrically distributed at one end of the two connecting plates. The top of the connecting plate is provided with an adjustment hole, and the bottom of the threaded rod is threaded to the inner wall of the adjustment hole, so that the angle of the scraper can be adjusted quickly and conveniently, thereby enabling better scraping of cables of different specifications.

[0011] Preferably, the auxiliary mechanism includes a heating box, a dustproof net, a limiting plate, fixing bolts, and a heating device. The inner wall of the heating box is in contact with the top of the dustproof net, the bottom of the dustproof net is connected to the top of the limiting plate, the inner wall of the limiting plate is threaded to the outer wall of the fixing bolts, the inner wall of the heating box is connected to one side of the heating device, and an exhaust fan is fixedly installed on the inner wall of the heating box. One end of the exhaust fan is connected to a duct, and the other end of the duct is connected to a dust collector.

[0012] Preferably, the heating box has an air inlet slot on the top and a limiting hole on the inner wall of the heating box. The top of the fixing bolt is threaded to the inner wall of the limiting hole, so that the dustproof net can be quickly and easily disassembled and assembled, and thus can be used better.

[0013] Preferably, there are two heating devices, which are symmetrically distributed on the inner wall of the heating box. There are also two air collecting hoods, which are symmetrically distributed on one side of two protective plates. This allows hot air to be blown quickly and conveniently onto the power cables in the power line, thereby further melting small ice particles.

[0014] Preferably, the bottom of the base plate is connected to the top of the protective plate, the inner wall of the protective plate is connected to the outer wall of the electric telescopic rod, and the top of the base plate is connected to the bottom of the heating box.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This auxiliary heating device for de-icing power lines utilizes a de-icing mechanism where an ice-breaking gear first breaks up thick ice, a scraper removes residual ice debris, and the auxiliary heating device and air collector simultaneously blow hot air to melt small ice particles. This solves the problem of time-consuming de-icing methods that rely solely on heating. The electric telescopic rod allows for flexible adjustment of the positions of the moving wheels, ice-breaking gear, and scraper. Combined with the spring buffer structure of the moving wheels, it can adapt to power lines of different diameters. The scraper angle is adjustable via a threaded rod, further enhancing its adaptability to different line specifications.

[0017] 2. The auxiliary heating device for de-icing power lines uses an auxiliary mechanism to raise the temperature of the air inside the heating chamber. The hot air is then blown onto the power lines by a fan and a hood, enabling further de-icing. The combination of mechanical crushing, scraping, and hot air melting works synergistically to break up thick ice layers and remove residual ice chips and small ice particles from the surface, preventing refreezing of residual ice, ensuring effective de-icing, and reducing the risk of secondary icing. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0021] Figure 3 This is a partial structural schematic diagram of the present invention;

[0022] Figure 4 This is a schematic diagram of the cleaning mechanism of the present invention. Figure 1 ;

[0023] Figure 5 This is a schematic diagram of the cleaning mechanism of the present invention. Figure 2 ;

[0024] Figure 6 This is a schematic diagram of the cleaning mechanism of the present invention. Figure 3 ;

[0025] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point A in the diagram;

[0026] Figure 8This is a schematic diagram of the auxiliary mechanism of the present invention. Figure 1 ;

[0027] Figure 9 This is a schematic diagram of the auxiliary mechanism of the present invention. Figure 2 .

[0028] In the diagram: 1. Base plate; 2. Protective plate; 3. Cleaning mechanism; 301. Electric telescopic rod; 302. Connecting plate one; 303. Moving plate; 304. Telescopic rod; 305. Bearing plate; 306. Moving wheel; 307. Fixed plate; 308. Mounting plate; 309. Drive motor; 310. Ice-breaking gear; 311. Connecting plate two; 312. Rotating rod; 313. Movable plate; 314. Scraper; 315. Rotating plate; 316. Threaded rod; 4. Auxiliary mechanism; 401. Heating box; 402. Dustproof net; 403. Limiting plate; 404. Fixing bolt; 405. Heating equipment; 406. Exhaust fan; 407. Air duct; 408. Air collection hood. Detailed Implementation

[0029] 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] Example 1:

[0032] Please see Figure 1-9 The present invention provides a technical solution: an auxiliary heating device for removing ice from power lines, comprising a base plate 1 and a protective plate 2, wherein an ice removal structure is provided above the base plate 1;

[0033] The de-icing structure includes a clearing mechanism 3 and an auxiliary mechanism 4;

[0034] The cleaning mechanism 3 includes an electric telescopic rod 301, a connecting plate 302, a movable plate 303, a telescopic rod 304, and a support plate 305. One end of the electric telescopic rod 301 is connected to one side of the connecting plate 302, the top of the connecting plate 302 is connected to the bottom of the movable plate 303, the other side of the connecting plate 302 is connected to one end of the telescopic rod 304, and the other end of the telescopic rod 304 is connected to one side of the support plate 305. A movable wheel 306 is rotatably connected to the inner side of the support plate 305. A fixing plate 307 is fixedly installed on one end of the connecting plate 302. A mounting plate 308 is fixedly installed at one end of plate 307. A drive motor 309 is fixedly installed at the top of mounting plate 308. An ice-breaking gear 310 is fixedly installed at the output end of drive motor 309. A connecting plate 2 311 is fixedly installed at the other end of connecting plate 1 302. A rotating rod 312 is rotatably connected to the inner side of connecting plate 2 311. A movable plate 313 is fixedly installed on the outer wall of rotating rod 312. A scraper 314 is fixedly installed at one end of movable plate 313. A rotating plate 315 is fixedly installed at the top of movable plate 313. A threaded rod 316 is threadedly connected to the inner wall of rotating plate 315.

[0035] In this embodiment, there are four electric telescopic rods 301, which are symmetrically distributed on the inner walls of the two protective plates 2. There are two connecting plates 302, which are symmetrically distributed on one end of the four electric telescopic rods 301. This allows for quick and convenient adjustment of the positions of the moving wheel 306, the ice-breaking gear 310, and the scraper 314, thereby enabling better cleaning work.

[0036] Furthermore, a movable groove is provided at the bottom of the base plate 1, and the top of the movable plate 303 is slidably connected to the inner wall of the movable groove. There are several movable wheels 306, which are symmetrically distributed on one side of the two connecting plates 302. A spring is fixedly installed between one side of the bearing plate 305 and one side of the connecting plate 302, so that ice on cables of different specifications can be removed quickly and conveniently, thus enabling better use.

[0037] Furthermore, there are four ice-breaking gears 310, which are symmetrically distributed at one end of the two mounting plates 308. There are two scrapers 314, which are symmetrically distributed at one end of the two connecting plates 302. The top of the connecting plate 311 has an adjustment hole, and the bottom of the threaded rod 316 is threaded to the inner wall of the adjustment hole, so that the angle of the scraper 314 can be quickly and conveniently adjusted, thereby enabling better scraping of cables of different specifications.

[0038] Equipment installation and parameter setting

[0039] Equipment fixing and adaptation adjustment:

[0040] Hoist the equipment to the target line (20mm in diameter), start the four electric telescopic rods, set the extension to 70mm, drive the connecting plate to move closer, and make the moving wheel fit with the line (spring compression 10mm, fitting pressure 15N). Use calipers to verify that the deviation between the center of the line and the equipment is ≤2mm.

[0041] Icebreaking parameter settings:

[0042] Start the drive motor, set the speed to 400 r / min, and set the ice-breaking gear to a contact depth of 5 mm with the ice to ensure that the thick ice is broken without damaging the aluminum strands of the wire.

[0043] Scraper angle adjustment:

[0044] Loosen the threaded rod (torque drops from 12 N·m to 0), rotate the scraper to 35° (suitable for 20 mm lines), tighten the threaded rod to 12 N·m to lock, and leave a 0.5 mm gap between the scraper and the line;

[0045] Heating parameter settings:

[0046] Start the heating equipment, set the heating temperature to 70℃, and the exhaust fan airflow to 1200m³ / h. 3 / h, wind speed 12m / s, and a distance of 30mm between the air collector and the line to ensure full coverage of hot air.

[0047] Ice removal operation

[0048] Movement and icebreaking are synchronized:

[0049] Start the moving wheels (speed 0.5m / min), and the equipment moves at a constant speed along the line. The ice-breaking gear first breaks up 20mm thick ice, and the broken ice particles are ≤10mm in diameter.

[0050] Scraping and heating work together:

[0051] The scraper follows the ice-breaking gear to scrape off residual ice chips (residual thickness ≤1mm); the air collection hood blows 70℃ hot air to melt the remaining fine ice particles, achieving a triple de-icing process of "ice breaking-scraping-ice melting".

[0052] Quality verification:

[0053] After de-icing, there are no residual ice particles (≤0.5mm) on the surface of the line, the aluminum strands of the conductor are undamaged (no scratches or broken strands when observed with a magnifying glass), and the de-icing efficiency is ≥0.5m / min, which means the operation is qualified;

[0054] Device reset:

[0055] After de-icing is completed, turn off the heating equipment and drive motor, reset the electric telescopic rod (30mm stroke), and move the moving wheels in the opposite direction to a safe position to complete the operation.

[0056] When it is necessary to remove ice from power lines, the operator places the device on the power line. Activating the electric telescopic rod 301 moves the connecting plate 302, which in turn moves the sliding plate 303 against the bottom of the base plate 1, increasing the stability of the connecting plate 302's movement. The movement of the connecting plate 302 indirectly moves the bearing plate 305, which in turn moves the moving wheel 306. The moving wheel 306 can contact the cables on the power line, allowing it to travel on cables of different specifications. The device is fixed to the power line. Activating the moving wheel 306 allows the device to move along the power line. When encountering uneven surfaces, the moving wheel 306 presses against the bearing plate 305, which in turn presses against the telescopic rod 304 and the spring, allowing the device to pass smoothly. The movement of the connecting plate 302 also ensures... Simultaneously, the ice-breaking gear 310 and scraper 314 move. When cleaning is required, the drive motor 309 is started to drive the ice-breaking gear 310 to rotate. The rotation of the ice-breaking gear 310 can remove the ice covering the power lines, and the scraper 314 can further scrape off the remaining ice, effectively preventing residue. When it is necessary to adjust the angle of the scraper 314 according to different specifications of power lines, the threaded rod 316 is rotated to move it on the inner wall of the rotating plate 315. The movement of the threaded rod 316 can be pulled out from one side of the connecting plate 311, thereby removing the limiting fixation of the rotating plate 315. At this time, rotating the rotating plate 315 drives the rotating rod 312 to rotate, which in turn drives the movable plate 313 to rotate, which in turn drives the scraper 314 to rotate. This allows for quick and convenient adjustment of the angle of the scraper 314, thus enabling better scraping of cables of different specifications and improving its usability.

[0057] Example 2:

[0058] Based on Embodiment 1, the auxiliary mechanism 4 includes a heating box 401, a dustproof net 402, a limiting plate 403, a fixing bolt 404, and a heating device 405. The inner wall of the heating box 401 is in contact with the top of the dustproof net 402, the bottom of the dustproof net 402 is connected to the top of the limiting plate 403, the inner wall of the limiting plate 403 is threaded to the outer wall of the fixing bolt 404, the inner wall of the heating box 401 is connected to one side of the heating device 405, and an exhaust fan 406 is fixedly installed on the inner wall of the heating box 401. One end of the exhaust fan 406 is connected to a duct 407, and one end of the duct 407 is connected to a dust collector hood 408.

[0059] In this embodiment, an air inlet slot is provided on the top of the heating box 401, and a limiting hole is provided on the inner wall of the heating box 401. The top of the fixing bolt 404 is threadedly connected to the inner wall of the limiting hole, so that the dustproof net 402 can be quickly and conveniently disassembled and assembled, and thus can be used better.

[0060] Furthermore, there are two heating devices 405, which are symmetrically distributed on the inner wall of the heating box 401. There are also two air collecting hoods 408, which are symmetrically distributed on one side of the two protective plates 2. This allows hot air to be blown onto the power cables in the power line quickly and conveniently, thereby melting the small ice blocks.

[0061] Furthermore, the bottom of the base plate 1 is connected to the top of the protective plate 2, the inner wall of the protective plate 2 is connected to the outer wall of the electric telescopic rod 301, and the top of the base plate 1 is connected to the bottom of the heating box 401.

[0062] Regular maintenance:

[0063] Every 10km of operation, check the wear of the ice-breaking gears (replace when tooth tip wear > 2mm); clean residual ice debris from the scraper surface and check the polyurethane layer (replace when wear > 3mm); calibrate the scraper angle (error ≤ 1°).

[0064] Clean the dust filter (200 mesh) every month, and replace it if it is severely clogged; test the temperature of the heating equipment (adjustable from 60-80℃, error ≤5℃); check the air duct for damage and air leakage;

[0065] Every 5km of operation, lubricate the electric telescopic pole and threaded rod (apply low-temperature lithium-based grease); check the insulation layer of the moving wheels (no damage or cracks); verify the thrust of the electric telescopic pole (error ≤ 5%).

[0066] Every 3 months, test the equipment insulation resistance (≥100MΩ); check the flexibility of the fall arrestor (pull force ≥500kg); and test the effectiveness of the emergency stop button.

[0067] When it is necessary to remove ice from power lines, the operator places the device on the power line. By activating the removal mechanism 3, the position of the moving wheels 306 can be quickly and easily adjusted, allowing it to move on power lines of different specifications and quickly and easily remove ice from power lines of different specifications. After the ice-breaking gear 310 removes the ice, the heating device 405 is activated to heat up the air temperature inside the heating box 401. At this time, the exhaust fan 406 is activated to transport the air inside the heating box 401 through the air duct 407 to the air collection hood 408, and the air collection hood 408 blows the air onto the power lines. The cable is used to further heat and melt small ice cubes, preventing residue and incomplete cleaning. The dustproof net 402 filters impurities from the outside air entering the heating chamber 401, effectively preventing damage to internal parts. When the dustproof net 402 needs to be removed, the fixing bolt 404 is rotated to move it on the inner wall of the limiting plate 403. The moving of the fixing bolt 404 allows it to be pulled out from the inner wall of the heating chamber 401, thus removing the limiting fixation of the dustproof net 402 and allowing it to be disassembled. When it needs to be installed, the above steps are repeated in reverse to install the dustproof net 402.

[0068] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0069] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An auxiliary heating device for de-icing power lines, comprising a base plate (1) and a shield plate (2), characterized in that: The bottom plate (1) is provided with a deicing structure above it; The deicing structure comprises a cleaning mechanism (3) and an auxiliary mechanism (4); The cleaning mechanism (3) comprises an electric telescopic rod (301), a connecting plate (302), a moving plate (303), a telescopic rod (304), and a bearing plate (305). One end of the electric telescopic rod (301) is connected to one side of the connecting plate (302). The top of the connecting plate (302) is connected to the bottom of the moving plate (303). The other side of the connecting plate (302) is connected to one end of the telescopic rod (304). The other end of the telescopic rod (304) is connected to one side of the bearing plate (305). The inner side of the bearing plate (305) is rotatably connected to a moving wheel (306). One end of the connecting plate (302) is fixedly installed with a fixed plate (307). One end of the fixed plate (307) is fixedly installed with a mounting plate (308). The top of the mounting plate (308) is fixedly installed with a driving motor (309). The output end of the driving motor (309) is fixedly installed with an ice-breaking gear (310). The other end of the connecting plate (302) is fixedly installed with a connecting plate (311). The inner side of the connecting plate (311) is rotatably connected to a rotating rod (312). The outer wall of the rotating rod (312) is fixedly installed with a movable plate (313). One end of the movable plate (313) is fixedly installed with a scraper (314). The top of the movable plate (313) is fixedly installed with a rotating plate (315). The inner wall of the rotating plate (315) is threadedly connected with a threaded rod (316).

2. An auxiliary heating device for power line de-icing according to claim 1, characterized in that: The number of electric telescopic rods (301) is four. The electric telescopic rods (301) are respectively symmetrically distributed on the inner walls of the two protective plates (2). The number of connecting plates (302) is two. The connecting plates (302) are respectively symmetrically distributed on one end of the four electric telescopic rods (301).

3. The auxiliary heating device for power line de-icing according to claim 1, characterized in that: The bottom plate (1) is provided with a moving groove at the bottom. The top of the moving plate (303) is slidingly connected to the inner wall of the moving groove. The number of moving wheels (306) is several. The moving wheels (306) are respectively symmetrically distributed on one side of the two connecting plates (302). The side of the bearing plate (305) and the side of the connecting plate (302) are fixedly installed with a spring.

4. The auxiliary heating device for power line de-icing according to claim 1, characterized in that: The number of ice-breaking gears (310) is four. The ice-breaking gears (310) are respectively symmetrically distributed on one end of the two mounting plates (308). The number of scrapers (314) is two. The scrapers (314) are respectively symmetrically distributed on one end of the two connecting plates (302). The top of the connecting plate (311) is provided with an adjusting hole. The bottom of the threaded rod (316) is threadedly connected to the inner wall of the adjusting hole.

5. The auxiliary heating device for power line de-icing according to claim 1, characterized in that: The auxiliary mechanism (4) includes a heating box (401), a dust screen (402), a limiting plate (403), a fixing bolt (404), a heating device (405), the inner wall of the heating box (401) is in extrusion contact with the top of the dust screen (402), the bottom of the dust screen (402) is connected with the top of the limiting plate (403), the inner wall of the limiting plate (403) is threadedly connected with the outer wall of the fixing bolt (404), the inner wall of the heating box (401) is connected with one side of the heating device (405), the inner wall of the heating box (401) is fixedly provided with an air extractor (406), one end of the air extractor (406) is communicated with a wind guide pipe (407), one end of the wind guide pipe (407) is communicated with a wind collecting cover (408).

6. An auxiliary heating device for power line de-icing according to claim 5, characterized in that: The top of the heating box (401) is provided with an air inlet groove, the inner wall of the heating box (401) is provided with a limiting hole, and the top of the fixing bolt (404) is threadedly connected with the inner wall of the limiting hole.

7. An auxiliary heating device for power line de-icing according to claim 5, characterized in that: The number of the heating device (405) is two, the heating device (405) is respectively and symmetrically distributed on the inner wall of the heating box (401), the number of the wind collecting cover (408) is two, and the wind collecting cover (408) is respectively and symmetrically distributed on one side of the two protective plates (2).

8. The auxiliary heating device for power line de-icing according to claim 1, characterized in that: The bottom of the bottom plate (1) is connected with the top of the protective plate (2), the inner wall of the protective plate (2) is connected with the outer wall of the electric telescopic rod (301), and the top of the bottom plate (1) is connected with the bottom of the heating box (401).

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