Furnace burden preheating equipment for steel-making furnace

Abstract

The utility model provides furnace charge preheating equipment for a steel-making furnace. The furnace charge preheating equipment comprises a box body, a support arranged at the bottom of the box body, a cover plate arranged at the upper end of the box body, a partition plate arranged in the box body, a discharging set arranged at the bottom of the partition plate, a heating pipe embedded in the inner wall of the lower portion of the box body, and a conveying pipe arranged in the box body. According to the steelmaking furnace burden preheating equipment, by arranging the cover plate, the baffle and other structures, heat exposed out of the equipment is reduced, the cover plate is ingeniously combined with a sealing block through a sliding plate, the sealing block is embedded into a sliding plate groove, and a bottom sealing plate can effectively prevent heat loss and improve heat efficiency, and the baffle can flexibly rotate by means of movable connection of a rotating shaft and a positioning plate; and the hydraulic rod enables the baffle to be more stable during limiting, preheating effect fluctuation and temperature reduction are avoided, the preheating quality of furnace charge is effectively improved, a solid foundation is laid for efficient, stable and refined operation of steelmaking production, the cost is reduced, and the product quality is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of steel -making furnace, more specifically, relate to a kind of steel -making furnace charge preheating equipment. BACKGROUND

[0002] When carrying out steelmaking, preheating device needs to be used when charge is preheated, and the existing charge preheating device transports single batch of charge into preheating tank, and then transports the charge into steelmaking furnace for smelting after preheating to appropriate temperature, which may cause temperature reduction after charge reaches, and is uncontrollable, therefore, it is very important to design a new type of steel -making furnace charge preheating equipment. However, the prior art scheme has the following defects: it is inconvenient to install the heating device of the steel -making furnace charge preheating equipment, and it is inconvenient to realize automatic feeding of the steel -making furnace charge preheating equipment.

[0003] For the above problems, for the technical problem that the existing device is not convenient for automatic feeding, a lot of retrieval is carried out, and a kind of steel -making furnace charge preheating equipment with patent application number 202323010220.6 is found, which belongs to the technical field of steel -making furnace, comprising: base, the bottom end of base is provided with universal wheel, and the upper end of base is provided with partition, the upper end of partition is provided with heating pipe, and the outer end of heating pipe is provided with connector; transmission line is arranged at the outer end of connector, and the outer end of transmission line is provided with preheating chamber, the right end of preheating chamber is provided with discharge pipe, storage chamber is arranged at the upper end of preheating chamber, the inner end of storage chamber is provided with connecting rod, and the inner end of connecting rod is provided with stabilizing frame, the inner end of stabilizing frame is provided with control box, and the inside of control box is provided with motor, and the lower end of motor is provided with material conveying rod; protective cover is arranged at the upper end of storage chamber. The steel -making furnace charge preheating equipment is convenient for installing the heating device of the steel -making furnace charge preheating equipment, and is convenient for realizing automatic feeding of the steel -making furnace charge preheating equipment, but the technical scheme provided by the patent has the following problems:

[0004] When the device is fed, part of the temperature will overflow from the feeding port, thereby reducing the temperature of the preheating chamber, thereby prolonging the preheating time of the charge and causing the efficiency of the device to decrease.

[0005] The utility model can reduce the influence on the preheating chamber when adding material, thereby improving the working efficiency of the device. UTILITY MODEL CONTENTS

[0006] The utility model aims at solving the technical problems in the above background art, and provides a kind of steel -making furnace charge preheating equipment.

[0007] In order to achieve the above object, the utility model provides the following technical scheme: a kind of steelmaking furnace charge preheating equipment, comprising: box, the bottom of the box is provided with support, the upper end of the box is provided with cover plate, the inside of the box is provided with baffle, the bottom of the baffle is provided with discharging group, the inside wall below the box is embedded with heating pipe, and the inside of the box is provided with material conveying pipe;

[0008] The cover plate includes a sliding plate and a sealing block, the sealing block can be embedded in the sliding plate, and a groove is formed in the bottom of the sliding plate, and the sealing block can be embedded in the groove.

[0009] The baffle includes a positioning plate and a baffle plate, the positioning plate is fixedly installed in the box, and the baffle plate can be embedded on one side of the positioning plate, and the baffle is located above the material conveying pipe, and the discharging group is located between the baffle and the material conveying pipe.

[0010] Further preferred scheme: the upper end of the box is provided with two sliding grooves, and the bottom of the sliding plate is provided with two sliding blocks, and the two sliding blocks can be embedded in the two sliding grooves.

[0011] Further preferred scheme: the upper end of the sliding plate is provided with an electric telescopic rod, and the output end of the electric telescopic rod penetrates through the bottom of the sliding plate and is connected with the sealing block.

[0012] Further preferred scheme: the bottom of the sealing block is provided with a sealing plate, and the sealing plate is detachably connected with the sealing block, the upper end of the sealing block is provided with a plurality of springs, and the upper end of the spring is installed in the top end of the groove.

[0013] Further preferred scheme: the inside of the positioning plate is provided with a rotating shaft, and the rotating shaft penetrates through both sides of the baffle plate at both ends, the both ends of the baffle plate are arc-shaped, and the rotating shaft is movably connected with the baffle plate.

[0014] Further preferred scheme: the inside wall of the box is embedded with a hydraulic rod, and the upper end of the hydraulic rod is in contact with the bottom of the baffle plate, the bottom of the baffle plate is provided with a connecting plate, and the connecting plate and the bottom of the baffle plate are both provided with connecting pieces.

[0015] Further preferred scheme: a returner is arranged between the two connecting pieces, and the both ends of the returner are movably connected with the connecting pieces.

[0016] Further preferred scheme: heat-conducting plates are arranged around the bottom of the inside of the box, and the heat-conducting plates correspond to the positions of the heating pipes.

[0017] Beneficial effects:

[0018] 1. Through the setting of the cover plate, the cover plate is used to seal the feeding port, the cover plate is composed of a sliding plate and a sealing block, the sealing block can be embedded into the groove at the bottom of the sliding plate, and the bottom of the sealing block is provided with a detachable sealing plate, when the equipment is running and heating, it can effectively prevent heat loss, concentrate the heat in the box on the furnace charge, improve the thermal efficiency, for example, in the high temperature environment of steelmaking furnace charge preheating, good sealing can avoid a large amount of heat overflow, not only saves energy, but also guarantees the preheating effect and the safety of the surrounding environment, ensures that the furnace charge is fully preheated, helps to improve the steelmaking quality and energy utilization rate, the electric telescopic rod connects the sliding plate and the sealing block, realizes the automatic lifting control of the sealing block, when the cover plate is opened or closed, the sliding block ensures the accurate position of the sliding plate under the guidance of the sliding groove, reduces the risk of heat loss, can accurately control the position and speed of the sealing block according to the production rhythm and process requirements, without manual intervention, greatly improves the automation degree and operation convenience of the equipment, reduces the labor intensity, improves the production efficiency, at the same time, it is also convenient for equipment maintenance, feeding and cleaning operation, if the sealing effect of the sealing plate is reduced due to wear or aging, it can be easily disassembled and replaced, ensures that the equipment always maintains good sealing performance, prolongs the service life of the cover plate as a whole;

[0019] 2. By setting the baffle, the baffle is arc-shaped at both ends, which can reduce the accumulation and jamming of the furnace charge at both ends, the hydraulic rod in the inner wall of the box cooperates with the baffle to actively control the opening and closing of the baffle, when discharging is needed, the hydraulic rod retracts to make the baffle turn down under the action of the gravity of the furnace charge; when discharging is not needed, the hydraulic rod is elongated and returns to the original position with the help of the return device, which meets the diversified requirements of different steelmaking processes for furnace charge preheating, improves the fine management level of steelmaking production and the stability of product quality, ensures the consistency and stability of each discharging process, avoids the fluctuation of the preheating effect of the furnace charge due to the random change of the position of the baffle, effectively prevents the preheating temperature in the box from falling, maintains the stability and reliability of the preheating process, reduces the product quality defects caused by the fluctuation of process parameters, guarantees the efficient and stable operation of steelmaking production, reduces the production cost and energy consumption;

[0020] 3. As described above, the furnace charge preheating equipment of the steelmaking furnace reduces the heat loss of the device by setting the cover plate and the baffle, the cover plate is combined with the sliding plate and the sealing block, the sealing block is embedded into the groove of the sliding plate and the bottom sealing plate can effectively prevent heat loss, which improves the thermal efficiency, the baffle is flexibly connected with the positioning plate through the shaft, which can be flexibly rotated, the arc-shaped design at both ends optimizes the material flow, reduces the accumulation and jamming and damage, the hydraulic rod makes the baffle more stable when it is limited, avoids the fluctuation of the preheating effect and the temperature drop, greatly improves the adaptability, operation stability, operation flexibility and process controllability of the equipment to different furnace charge conditions, effectively improves the preheating quality of the furnace charge, lays a solid foundation for the efficient, stable and fine operation of steelmaking production, reduces the cost and guarantees the product quality. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the whole structure schematic view of the utility model.

[0022] Figure 2 It is the box internal structure schematic view of the utility model.

[0023] Figure 3 It is the partition plate structure schematic view of the utility model.

[0024] Figure 4 It is the cover plate structure schematic view of the utility model.

[0025] Figure 5 It is the restorer structure schematic view of the utility model.

[0026] Figure 6 It is the Figure Two A enlarged structure schematic view.

[0027] Figures 1-6 Middle: 1, box;101, sliding groove;102, hydraulic rod;103, heat conduction plate;2, support;3, cover plate;301, sliding plate;302, sealing block;303, recess;304, sliding block;305, electric telescopic rod;306, sealing plate;307, spring;4, partition plate;401, positioning plate;402, baffle;403, rotating shaft;404, connecting plate;405, connecting piece;406, restorer;5, blanking group;6, heating pipe;7, material conveying pipe. Specific implementation

[0028] The utility model will be described below in conjunction with the drawings in the embodiment of the utility model. Figures 1-6 The technical scheme in the embodiment of the utility model is clearly and completely described.

[0029] Please refer to Figures 1-6 The utility model discloses a kind of steelmaking furnace charge preheating equipment, comprising: box 1, box 1 bottom is provided with support 2, box 1 upper end is provided with cover plate 3, box 1 inside is provided with partition plate 4, partition plate 4 bottom is provided with blanking group 5, box 1 lower inner wall is embedded with heating pipe 6, and box 1 inside is provided with material conveying pipe 7;Cover plate 3 includes sliding plate 301 and sealing block 302, sealing block 302 can be embedded in the inside of sliding plate 301, and recess 303 is set in the bottom of sliding plate 301, and sealing block 302 can be embedded in the inside of recess 303;Partition plate 4 includes positioning plate 401 and baffle 402, positioning plate 401 is fixedly installed in the inside of box 1, and baffle 402 can be embedded in one side of positioning plate 401, and partition plate 4 is located above material conveying pipe 7, blanking group 5 is located between partition plate 4 and material conveying pipe 7;Box 1 inside lower portion is provided with heat conduction plate 103 around, and heat conduction plate 103 and heating pipe 6 position correspond;

[0030] The structure and operation mode of the blanking group 5 and the preheating mode in the embodiment can refer to the patent publication No. CN220959643U, which is prior art and will not be described in detail in the embodiment.The steelmaking furnace charge preheating equipment is mainly composed of a box body 1, a support 2, a cover plate 3, a partition plate 4, a discharging group 5, a heating pipe 6, a material conveying pipe 7 and the like. The purpose of the equipment is to improve the steelmaking efficiency and reduce energy consumption by preheating the furnace charge. The box body 1 serves as the main body shell of the whole equipment and provides a relatively closed and stable space for the internal preheating process. The support 2 is used to support the box body 1 and keep it at a suitable working height, facilitating the feeding and discharging of materials and the operation of the equipment. The cover plate 3 is used to seal the charging port. The cover plate 3 is composed of a sliding plate 301 and a sealing block 302. The sealing block 302 can be embedded in the sliding plate 301, and the bottom of the sliding plate 301 is provided with a groove 303. The sealing block 302 can be embedded in the groove 303, so that the cover plate 3 can form a good sealing effect when it is closed. When the equipment is running, especially when the heating pipe 6 is heating the furnace charge in the box body 1, the sealed cover plate 3 can prevent heat loss and improve thermal efficiency. For example, during the preheating process of the steelmaking furnace charge, if the sealing is not good in a high-temperature environment, a large amount of heat will overflow, which not only wastes energy but also affects the preheating effect and the surrounding working environment. The structure of the cover plate 3 can effectively avoid this situation and ensure that the heat in the box body 1 is concentrated on the furnace charge. At the same time, the relative movement design of the sliding plate 301 and the sealing block 302 also facilitates the opening and closing of the cover plate 3 when it is necessary to open the cover plate 3 for equipment maintenance, charging or cleaning, etc., thereby improving the operability and maintenance convenience of the equipment. The partition plate 4 is composed of a positioning plate 401 and a baffle 402. The positioning plate 401 is fixedly installed in the box body 1, and the baffle 402 can be embedded in one side of the positioning plate 401. The partition plate 4 is located above the material conveying pipe 7 and its main function is to control the flow path and residence time of the furnace charge in the box body 1. The positioning plate 401 provides a stable installation basis and accurate positioning for the baffle 402, ensuring the stability and reliability of the partition plate 4 structure, making the addition of furnace charge more convenient and ensuring that the furnace charge can uniformly pass through the discharging group 5 into the material conveying pipe 7, thereby ensuring that the furnace charge can be fully and uniformly preheated in the box body 1, improving the preheating quality and the adaptability of the equipment. Heat-conducting plates 103 are arranged around the bottom of the box body 1, and the heat-conducting plates 103 correspond to the positions of the heating pipe 6. The heating pipe 6 is the main heat source of the equipment and converts electrical energy into heat energy to heat the furnace charge in the box body 1. The heat-conducting plates 103 play a role in uniform heat distribution. Since the heat distribution on the surface of the heating pipe 6 may not be uniform when it is working, the heat-conducting plates 103 can quickly conduct the heat generated by the heating pipe 6 to the entire bottom of the box body 1, making the temperature field in the box body 1 more uniform and avoiding local overheating or overcooling. During the falling and moving of the furnace charge through the discharging group 5 in the box body 1, the furnace charge can be preheated in a relatively stable and uniform temperature environment, which is conducive to improving the preheating effect and quality of the furnace charge and reducing problems such as insufficient preheating or local excessive heating of the furnace charge caused by uneven temperature, thereby improving the working performance and production efficiency of the whole steelmaking furnace charge preheating equipment.

[0031] The utility model discloses a box 1 upper end is provided with two chutes 101, and the bottom of sliding plate 301 is provided with two sliding blocks 304, and two sliding blocks 304 can embed two chutes 101, and the upper end of sliding plate 301 is provided with electric telescopic handle 305, and the output end of electric telescopic handle 305 is connected with sealing block 302 and penetrates the bottom of sliding plate 301, and the bottom of sealing block 302 is provided with sealing plate 306, and sealing plate 306 is detachably connected with sealing block 302, and the upper end of sealing block 302 is provided with a plurality of springs 307, and the upper end of spring 307 is installed in the inside top end of recess 303,

[0032] The upper end of the box body 1 is provided with two sliding grooves 101, and the bottom of the sliding plate 301 is provided with two sliding blocks 304, which can be embedded in the two sliding grooves 101, so that the movement of the sliding plate 301 on the upper end of the box body 1 is more stable and accurate. During the operation of the equipment, when it is necessary to open or close the cover plate 3, the sliding of the sliding block 304 in the sliding groove 101 can guide the sliding plate 301 to move in a predetermined direction, preventing the sliding plate 301 from deviating or shaking, thereby ensuring the sealing between the cover plate 3 and the box body 1, reducing heat loss or other adverse effects caused by poor sealing of the cover plate 3. At the same time, the symmetrical arrangement of the two sliding grooves 101 and the sliding block 304 also helps to evenly share the weight of the sliding plate 301 and the friction generated during movement, prolonging the service life of the sliding plate 301 and the box body 1. The upper end of the sliding plate 301 is provided with an electric telescopic rod 305, and the output end of the electric telescopic rod 305 penetrates the bottom of the sliding plate 301 and is connected with the sealing block 302. The electric telescopic rod 305 provides power for the up-down movement of the sealing block 302. When the equipment needs to close the cover plate 3 for preheating operation, the electric telescopic rod 305 can push the sealing block 302 to move downward, so that it is tightly embedded in the charging port, achieving good sealing effect. When the cover plate 3 needs to be opened, the electric telescopic rod 305 can pull the sealing block 302 upward so that the sealing block 302 and the sealing plate 306 are embedded in the inside of the groove 303, releasing the sealing state and facilitating subsequent operation. The electric control mode is more convenient and efficient than manual operation, can accurately control the position and movement speed of the sealing block 302, adapt to different production rhythms and process requirements, improve the automation level and production efficiency of the whole preheating equipment. The bottom of the sealing block 302 is provided with a sealing plate 306, and the sealing plate 306 is detachably connected with the sealing block 302. When the sealing block 302 is embedded in the groove 303, the sealing plate 306 will be compressed, filling the possible small gap between the sealing block 302 and the groove 303, further enhancing the sealing performance of the cover plate 3. During long-term use, if the sealing plate 306 loses its sealing effect due to wear or aging, it can be easily disassembled and replaced, ensuring that the sealing performance of the equipment is always in good condition and preventing heat leakage. The upper end of the sealing block 302 is provided with a plurality of springs 307, and the upper end of the spring 307 is installed at the top end inside the groove 303. The spring 307 plays a buffering and resetting role during the movement of the sealing block 302, further limiting the sealing block 302, making the sealing block 302 more stable during use.

[0033] The utility model discloses a positioning plate 401 inside is provided with pivot 403, and pivot 403 both ends run through the both sides of baffle 402, and the both ends of baffle 402 are arc shape, and pivot 403 and baffle 402 are between movable connection, the inner wall embedding of box 1 is provided with hydraulic rod 102, and hydraulic rod 102 upper end and baffle 402 bottom contact, and the bottom of baffle 4 is provided with connecting plate 404, and connecting plate 404 and baffle 402 bottom all are provided with connecting piece 405, the resettable device 406 is arranged between two connecting pieces 405, and the both ends of resettable device 406 and connecting piece 405 are between movable connection, the inner side of positioning plate 401 is provided with pivot 403, and pivot 403 both ends run through the both sides of baffle 402, and the both ends of baffle 402 are arc shape, and pivot 403 and baffle 402 are between movable connection, and this pivot 403 connecting mode makes baffle 402 can be relative to the flexible rotation of positioning plate 401, in the preheating process of furnace burden, when needing to add material, make baffle 402 overturn downward, make furnace burden can more smoothly pass the blanking group 5 and enter the material conveying pipe 7, avoided because of furnace burden block and influenced the normal operation of preheating equipment, improved equipment's adaptability and stability to different furnace burden condition, and the both ends of baffle 402 are arc shape, can reduce the accumulation and jam phenomenon of furnace burden in the both ends of baffle 402, and the arc edge can guide furnace burden more smoothly and flow through baffle 402, reduce the friction and the collision force between furnace burden and baffle 402, reduce the breakage rate of furnace burden, also help to keep the uniform distribution of furnace burden on the baffle 4, further guarantee the uniformity and stability of preheating in box 1, the inner wall embedding of box 1 is provided with hydraulic rod 102, and hydraulic rod 102 upper end and baffle 402 bottom contact, and hydraulic rod 102 as a kind of power device, can actively control the opening and closing of baffle 402, when needing to accelerate furnace burden blanking, can make hydraulic rod 102 retract, make baffle 402 overturn downward by the gravity of furnace burden, make furnace burden can enter the material conveying pipe 7, and when not needing blanking, use resettable device 406 and drive baffle 402, make hydraulic rod 102 elongate, to limit baffle 402, this hydraulic rod 102 and the cooperation of baffle 402 realize the accurate control to furnace burden flow and preheating time, improve the operation flexibility of equipment, the main role of resettable device 406 is after the action of hydraulic rod 102 ends or other external force disappears, make baffle 402 can restore to initial or preset position, like this can ensure the consistency and stability of each blanking process, avoid because baffle 402 position changes at random and lead to the fluctuation of furnace burden preheating effect, effectively prevent the temperature drop in the preheating of box 1 inside, make the device more stable when using.

[0034] Working principle: first, through the support 2 to be placed in the appropriate position, move the slide plate 301, add the charge, add the charge, move the slide plate 301 back to its original position, then use the electric telescopic rod 305 to drive the sealing block 302 to move down, so that the sealing plate 306 is embedded in the inside of the charging port, the sealing plate 306 at the bottom of the sealing block 302 is embedded in the charging port, the gap is filled to enhance the sealing effect, the spring 307 plays a buffering reset role, the sealing block 302 moves stably and ensures good sealing performance, prevents heat loss, the charge added by the charging port falls directly on the baffle 4, when the charge needs to be put, the hydraulic rod 102 retracts, the charge relies on its own gravity to make the baffle 402 rotate around the shaft 403 downward, the charge enters the conveying pipe 7 through the discharging group 5; when the charge is not needed, the hydraulic rod 102 is extended, the baffle 402 is driven by the return device 406 to restore to its original position and is limited, the charge flow and preheating time are accurately controlled, the discharging process is stable and consistent every time, the preheating effect and the temperature stability in the box 1 are avoided, in the box 1, the heating pipe 6 is electrified and heated, the electrical energy is converted into heat energy, the heat generated by the heating pipe 6 is quickly and uniformly conducted to the bottom of the box 1 through the heat conduction plate 103 corresponding to the position of the heating pipe 6, so that a stable and uniform temperature field is formed in the box 1, the charge is fully and uniformly preheated in the temperature environment during the falling and moving process in the box 1, the preheating quality is improved, and finally the preheated charge is conveyed to the steelmaking furnace through the conveying pipe 7 for subsequent steelmaking process, so as to improve the steelmaking efficiency and reduce energy consumption.

Claims

1. A steelmaking furnace charge preheating apparatus comprising: The application discloses a box (1), characterized in that the bottom of the box (1) is provided with a support (2), the upper end of the box (1) is provided with a cover plate (3), the inside of the box (1) is provided with a partition plate (4), the bottom of the partition plate (4) is provided with a discharging group (5), the inner wall below the box (1) is embedded with a heating pipe (6), and the inside of the box (1) is provided with a feeding pipe (7). The cover plate (3) comprises a sliding plate (301) and a sealing block (302), the sealing block (302) can be embedded into the inside of the sliding plate (301), the bottom of the sliding plate (301) is provided with a groove (303), and the sealing block (302) can be embedded into the inside of the groove (303). The partition plate (4) comprises a positioning plate (401) and a baffle (402), the positioning plate (401) is fixedly installed in the inside of the box (1), the baffle (402) can be embedded on one side of the positioning plate (401), and the partition plate (4) is located above the feeding pipe (7), and the discharging group (5) is located between the partition plate (4) and the feeding pipe (7).

2. A preheating device for a steelmaking furnace charge according to claim 1, characterized in that: The upper end of the box (1) is provided with two sliding grooves (101), the bottom of the sliding plate (301) is provided with two sliding blocks (304), and the two sliding blocks (304) can be embedded into the two sliding grooves (101).

3. A charge preheating device for a steelmaking furnace according to claim 1, characterized in that: The upper end of the sliding plate (301) is provided with an electric telescopic rod (305), and the output end of the electric telescopic rod (305) penetrates through the bottom of the sliding plate (301) and is connected with the sealing block (302).

4. A charge preheating device for a steelmaking furnace according to claim 1, characterized in that: The bottom of the sealing block (302) is provided with a sealing plate (306), the sealing plate (306) is detachably connected with the sealing block (302), the upper end of the sealing block (302) is provided with a plurality of springs (307), and the upper ends of the springs (307) are installed in the top end of the groove (303).

5. A charge preheating device for a steelmaking furnace according to claim 1, characterized in that: The inside of the positioning plate (401) is provided with a rotating shaft (403), the rotating shaft (403) penetrates through both sides of the baffle (402), the both ends of the baffle (402) are in arc shape, and the rotating shaft (403) is movably connected with the baffle (402).

6. A charge preheating device for a steelmaking furnace according to claim 1, characterized in that: The inner wall of the box (1) is embedded with a hydraulic rod (102), the upper end of the hydraulic rod (102) is in contact with the bottom of the baffle (402), the bottom of the partition plate (4) is provided with a connecting plate (404), and the bottom of the baffle (402) is provided with a connecting piece (405).

7. A preheating device for a steelmaking furnace charge according to claim 6, characterized in that: Two connecting pieces (405) are provided with a restorer (406), and the both ends of the restorer (406) are movably connected with the connecting pieces (405).

8. A charge preheating device for a steelmaking furnace according to claim 1, characterized in that: The lower part of the inside of the box (1) is provided with heat-conducting plates (103) around, and the heat-conducting plates (103) correspond to the positions of the heating pipe (6).

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