A hot melt kettle with anti-overheating function and its usage method

Abstract

This application provides a hot melt kettle with anti-overheating function and its usage method, including a support base, a protective cover fixedly installed on the upper end of the support base, a kettle body arranged inside the protective cover, a first motor fixedly installed on the upper end of the protective cover, a rotating shaft arranged inside the kettle body, a spiral stirring blade fixedly installed on the outer side of the rotating shaft, a scraping frame arranged on the outer side of the spiral stirring blade, a first temperature sensor fixedly installed on the surface of the scraping frame, a second temperature sensor fixedly installed on the outer side of the rotating shaft, a heating cover arranged on the outer side of the kettle body, a transmission chamber arranged at the lower end of the kettle body, a bevel gear one arranged inside the transmission chamber, and a bevel gear two arranged outside the bevel gear one. The present invention constructs a dual-point collaborative temperature measurement mechanism by setting the first temperature sensor in the inner wall area and the second temperature sensor in the central area of ​​the kettle body, respectively. The system can dynamically judge the thermal state based on the temperature difference and average temperature, actively adjust the heating intensity, and improve the real-time performance and accuracy of temperature control.

Description

Technical Field

[0001] This invention relates to the field of hot melt kettle technology, and in particular to a hot melt kettle with anti-overheating function and its usage method. Background Technology

[0002] The hot melt kettle is a key piece of equipment for hot melt road marking construction. It heats and stirs powdered paint to a molten state to provide liquid paint for subsequent construction. It is usually made of high-temperature and corrosion-resistant metal materials and is equipped with a heating system (such as electric heating or gas heating), a stirring device and a temperature control system to ensure that the material is heated evenly and maintains a suitable construction viscosity.

[0003] For example, patent number CN215800909U discloses an anti-overheating hot melt kettle for a marking machine, including a kettle cylinder. The top and bottom of the kettle cylinder are respectively provided with a feed inlet and a discharge outlet. A rotating cylinder is provided in the middle of the kettle cylinder, and several stirring columns are provided around the rotating cylinder. The inner cavity of the stirring column is connected to the inner cavity of the rotating cylinder. The inner cavities of the rotating cylinder and the stirring column are filled with heat-conducting oil. A temperature sensor is also provided inside the kettle cylinder. For example, patent number CN207130598U discloses an over-temperature alarm hot melt kettle, including a kettle cylinder and a central processing unit. The bottom of the kettle cylinder is fixedly connected to a support leg, and the bottom of the kettle cylinder is fixedly connected to an air inlet pipe inside the support leg. The air inlet pipe is fixedly connected to a support rod, and the bottom of the support rod is fixedly connected to a motor. The bottom end of the motor shaft is fixedly connected to a fan blade. A heat insulation layer is fixedly connected to the inner wall of the kettle cylinder, and a heat preservation layer is fixedly connected to the inside of the heat insulation layer. Although existing hot melt kettles are equipped with temperature sensors to monitor material temperature and prevent overheating, the indirect temperature measurement method poses risks of delayed control response or temperature misjudgment. In addition, over-temperature alarms mainly serve as warnings and still require manual intervention, making proactive intervention and adjustment difficult. When the kettle is heated unevenly, the heating system often starts and stops frequently, which not only affects melting efficiency but also causes unnecessary energy waste. Furthermore, the stirring structure is usually concentrated in the central area of ​​the kettle, resulting in slow material flow near the inner wall and easy adhesion to the wall. Material trapped in the high-temperature environment for a long time is prone to carbonization, discoloration, or even thermal decomposition, thus affecting the material properties.

[0004] Therefore, we have made improvements to this by proposing a hot melt kettle with anti-overheating function and its usage method. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of existing hot melt kettles, which have the risk of delayed control response or temperature misjudgment due to the use of indirect temperature measurement. At the same time, the over-temperature alarm mainly serves as a warning and still requires manual handling, making it difficult to actively intervene and adjust. In addition, the stirring structure is usually concentrated in the central area of ​​the kettle body, which leads to slow material flow near the inner wall and easy wall adhesion.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution: A hot melt kettle with anti-overheating function and its usage method are disclosed to improve the above-mentioned problems.

[0007] The application is as follows: The device includes a support base, a protective cover fixedly mounted on the upper end of the support base, a vessel body located inside the protective cover, a first motor fixedly mounted on the upper end of the protective cover, a rotating shaft inside the vessel body, a spiral stirring blade fixedly mounted on the outer side of the rotating shaft, a scraping frame located on the outer side of the spiral stirring blade, a first temperature sensor fixedly mounted on the surface of the scraping frame, a second temperature sensor fixedly mounted on the outer side of the rotating shaft, a heating cover located on the outer side of the vessel body, a transmission chamber located at the lower end of the vessel body, a first bevel gear located inside the transmission chamber, a second bevel gear located outside the first bevel gear, a drive screw located outside the transmission chamber, a drive block threadedly connected to the outer side of the drive screw, and a second motor fixedly mounted on the lower end of the support base.

[0008] As a preferred embodiment of the hot melt kettle with anti-overheating function and its usage method provided by the present invention, the upper end of the kettle body extends to the outside of the protective cover and is connected to the feeding port, and the lower end of the kettle body extends to the outside of the support base and is connected to the discharging port.

[0009] As a preferred embodiment of the hot melt kettle with anti-overheating function and its usage method provided by the present invention, the upper end of the rotating shaft is rotatably connected to the kettle body, the output end of the first motor is connected to the upper end of the rotating shaft through a sprocket assembly, the scraping frame is fixedly connected to the outer side of the rotating shaft, and the outer side of the scraping frame is in contact with the inner wall of the kettle body.

[0010] As a preferred embodiment of the hot melt kettle with anti-overheating function and its usage method provided by the present invention, a central control box is provided at the upper end of the protective cover. An information processing module and a control module are provided inside the central control box. The control module and the information processing module are electrically connected. The first temperature sensor and the second temperature sensor are both electrically connected to the information processing module. The first temperature sensor and the second temperature sensor are located at the same height.

[0011] As a preferred embodiment of the hot melt kettle with anti-overheating function and its usage method provided by the present invention, the heating cover is arranged in a ring array along the outer periphery of the kettle body, and its inner contour is adapted to the outer wall of the kettle body. The heating cover is an arc-shaped heating plate with built-in heating wire. A temperature controller is fixedly installed on the outside of the protective cover. The temperature controller and the information processing module are electrically connected. The heating cover and the temperature controller are electrically connected.

[0012] As a preferred embodiment of the hot melt kettle with anti-overheating function and its usage method provided by the present invention, a heat insulation plate is fixedly installed at the upper end of the transmission chamber, the heat insulation plate is fixedly connected to the lower end of the kettle body, the lower edge of the heating cover and the side of the heat insulation plate are adapted to each other, the output end of the second motor extends to the inner side of the transmission chamber and is fixedly connected to the bevel gear, and the second motor is electrically connected to the control module.

[0013] As a preferred embodiment of the hot melt kettle with anti-overheating function and its usage method provided by the present invention, the second bevel gear is arranged in a ring array around the first bevel gear and meshes with the first bevel gear. One end of the drive screw is rotatably connected to the transmission chamber and extends to the inner side of the transmission chamber and is fixedly connected to the second bevel gear. The other end of the drive screw is rotatably connected to the upper end of the support base through the support plate.

[0014] As a preferred embodiment of the hot melt kettle with anti-overheating function and its usage method provided by the present invention, the drive screw and the drive block are arranged in a ring array around the transmission chamber. The upper end of the drive block and the lower end of the heating cover are fixedly connected, and the lower end of the drive block and the surface of the support base are slidably connected by a slide rail.

[0015] A method for using a hot melt kettle with anti-overheating function, comprising the hot melt kettle with anti-overheating function as described above, is as follows: During use, the material is added into the vessel through the feed port. The heating cover is precisely managed by the temperature controller to heat the vessel. The output of the first motor drives the rotating shaft to rotate through the sprocket assembly, which in turn drives the spiral stirring blades to mix and stir the material. The scraper frame rotates synchronously with the rotating shaft, and its outer edge is always in close contact with the inner wall of the vessel, continuously scraping the material close to the inner wall. During the stirring process, the first temperature sensor is used to monitor the material temperature in the area close to the inner wall of the vessel in real time, and the second temperature sensor is used to detect the material temperature in the central area. The two sensors simultaneously collect temperature data at different radial positions inside the vessel and transmit the signals to the information processing module in the central control box. When the information processing module determines that the material temperature near the inner wall of the vessel, as measured by the first temperature sensor, is overheating, while the material temperature in the central area, as measured by the second temperature sensor, remains at a lower level, and the average temperature of the two points is still within the normal set range, the system determines that there is uneven local heating. The control module then controls the second motor to drive the first bevel gear to rotate, which in turn drives multiple second bevel gears to rotate synchronously. This causes each drive screw to rotate and drives the drive block to slide away from the transmission chamber, thereby moving multiple heating covers away from the vessel body and reducing the heat input intensity in the inner wall area. This process does not directly cut off the heating power supply but achieves dynamic control by adjusting the heating distance. This effectively suppresses local overheating and avoids energy waste and equipment damage caused by frequent start-stop of the heating covers. After adjustment, the stirring system continues to run. Once the information processing module confirms that the inner wall temperature has returned to the normal range, the control module drives the heating covers to reset and re-adhere to the outer wall of the vessel, restoring uniform heating. If the information processing module determines that the average temperature of the two points measured by the first temperature sensor and the second temperature sensor has exceeded the normal temperature threshold, it will determine that there is an overall risk of overheating. At this time, the temperature controller will control the heating cover to stop heating. During the heating stoppage, the spiral stirring blades and scraper frame will continue to operate to promote thermal equilibrium of the material in the vessel. After the temperature of both points drops back to the safe range, the heating cover will be restarted for hot melting operation.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: By continuously scraping the material close to the inner wall with a scraping frame, the material flow and heating uniformity in the area near the vessel wall are improved. By setting a first temperature sensor and a second temperature sensor in the inner wall area and the center area of ​​the vessel respectively, a dual-point collaborative temperature measurement mechanism is constructed. The system can dynamically judge the thermal state based on the temperature difference and average temperature, and actively adjust the heating intensity, thereby improving the real-time performance and accuracy of temperature control. When local overheating is detected but the overall temperature is normal, the heating cover is moved away from the vessel body to reduce the heat input intensity instead of directly cutting off the power supply. This avoids the heating system from repeatedly starting and stopping due to uneven heating, reducing energy waste. Whether it is local temperature difference adjustment or overall overheat protection, intervention and recovery can be completed automatically without manual intervention, improving the intelligence level of the equipment and operational safety. This device is based on an improvement of existing equipment, so the improvement cost is relatively low and it will not cause a large amount of existing equipment to be discarded. It ensures the processing effect while reducing the investment in improvement costs, making it suitable for large-scale production. Attached Figure Description

[0017] Figure 1 The diagram shown is a three-dimensional structural schematic of the hot melt kettle with anti-overheating function of the present invention. Figure 2 The diagram shown is a three-dimensional cross-sectional view of the hot melt kettle with anti-overheating function according to the present invention. Figure 1 ; Figure 3 The diagram shown is a three-dimensional structural schematic of the spiral stirring blade and scraping frame of the present invention. Figure 4 The diagram shown is a three-dimensional structural schematic of the support base, vessel body, and heating plate of the present invention. Figure 5 The diagram shown is a three-dimensional structural schematic of the heating plate and driving block of the present invention. Figure 6 The diagram shown is a three-dimensional cross-sectional view of the hot melt kettle with anti-overheating function according to the present invention. Figure 2 .

[0018] The image shows: 1. Support base; 101. Support plate; 2. Protective cover; 201. Central control box; 202. Temperature controller; 3. Kettle body; 301. Feed port; 302. Discharge port; 4. First motor; 5. Rotating shaft; 6. Spiral stirring blade; 7. Scraper frame; 8. First temperature sensor; 9. Second temperature sensor; 10. Heating cover; 11. Transmission chamber; 111. Heat insulation plate; 12. Bevel gear one; 13. Bevel gear two; 14. Drive screw; 15. Drive block; 16. Second motor. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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.

[0020] Therefore, the following detailed description of embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely illustrates some embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0025] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] Example 1 Please refer to Figure 1-6A hot melt kettle with anti-overheating function and its usage method include a support base 1, a protective cover 2 fixedly installed on the upper end of the support base 1, a kettle body 3 arranged inside the protective cover 2, a first motor 4 fixedly installed on the upper end of the protective cover 2, a rotating shaft 5 arranged inside the kettle body 3, a spiral stirring blade 6 fixedly installed on the outer side of the rotating shaft 5, a scraping frame 7 arranged on the outer side of the spiral stirring blade 6, a first temperature sensor 8 fixedly installed on the surface of the scraping frame 7, and a second temperature sensor 8 fixedly installed on the outer side of the rotating shaft 5. A temperature sensor 9 is used. A heating cover 10 is provided on the outside of the vessel body 3. A transmission chamber 11 is provided at the lower end of the vessel body 3. A bevel gear 12 is provided on the inner side of the transmission chamber 11. A bevel gear 13 is provided on the outer side of the bevel gear 12. A drive screw 14 is provided on the outer side of the transmission chamber 11. A drive block 15 is threadedly connected to the outer side of the drive screw 14. A second motor 16 is fixedly installed at the lower end of the support base 1. The upper end of the vessel body 3 extends to the outer side of the protective cover 2 and is connected to a feeding port 301. The lower end of the vessel body 3... A discharge port 302 extends to the outer side of the support base 1. The upper end of the rotating shaft 5 is rotatably connected to the vessel body 3. The output end of the first motor 4 is connected to the upper end of the rotating shaft 5 via a sprocket assembly. The scraper frame 7 is fixedly connected to the outer side of the rotating shaft 5. The outer side of the scraper frame 7 is in contact with the inner wall of the vessel body 3. A central control box 201 is provided at the upper end of the protective cover 2. An information processing module and a control module are provided inside the central control box 201. The control module and the information processing module are electrically connected. The first temperature sensor 8 and the second temperature sensor 9 are both electrically connected to the information processing module. The first temperature sensor 8 and the second temperature sensor 9 are located at the same height. The heating cover 10 is arranged in a ring array along the outer periphery of the vessel body 3, and its inner contour is adapted to the outer wall of the vessel body 3. The heating cover 10 is an arc-shaped heating plate with built-in heating wire. A temperature controller 202 is fixedly installed on the outer side of the protective cover 2. The temperature controller 202 is electrically connected to the information processing module. The heating cover 10 is electrically connected to the temperature controller 202.

[0028] Implementation process: The material is added into the vessel 3 through the feed port 301. The heating cover 10 is precisely managed by the temperature controller 202 to heat the vessel 3. The output end of the first motor 4 drives the rotating shaft 5 to rotate through the sprocket assembly, which in turn drives the spiral stirring blade 6 to mix and stir the material. The scraper frame 7 rotates synchronously with the rotating shaft 5, and its outer edge is always in close contact with the inner wall of the vessel 3, continuously scraping the material close to the inner wall.

[0029] Benefits of implementation: The scraper frame 7 continuously scrapes the material close to the inner wall, effectively preventing the phenomenon of material sticking to the wall, carbonization or decomposition caused by the material staying in the high temperature area. It improves the material flowability and heating uniformity in the area near the reactor wall, and prevents the material from sticking to the wall, carbonization, discoloration or thermal decomposition due to prolonged retention at high temperature. It ensures that the hot melt material has stable composition and excellent performance.

[0030] Example 2 A heat insulation plate 111 is fixedly installed on the upper end of the transmission chamber 11. The heat insulation plate 111 is fixedly connected to the lower end of the vessel body 3. The lower edge of the heating cover 10 and the side of the heat insulation plate 111 are adapted to each other. The output end of the second motor 16 extends to the inner side of the transmission chamber 11 and is fixedly connected to the first bevel gear 12. The second motor 16 is electrically connected to the control module. The second bevel gear 13 is arranged in a ring array around the first bevel gear 12 and meshes with the first bevel gear 12. One end of the drive screw 14 is rotatably connected to the transmission chamber 11 and extends to the inner side of the transmission chamber 11 and is fixedly connected to the second bevel gear 13. The other end of the drive screw 14 is rotatably connected to the upper end of the support base 1 through the support plate 101. The drive screw 14 and the drive block 15 are arranged in a ring array around the transmission chamber 11. The upper end of the drive block 15 is fixedly connected to the lower end of the heating cover 10. The lower end of the drive block 15 is slidably connected to the surface of the support base 1 through the slide rail.

[0031] Implementation process: During the stirring process, the first temperature sensor 8 is used to monitor the material temperature in the area close to the inner wall of the vessel 3 in real time, and the second temperature sensor 9 is used to detect the material temperature in the central area. The two sensors synchronously collect temperature data at different radial positions inside the vessel and transmit the signals to the information processing module in the central control box 201. When the information processing module determines that the material temperature near the inner wall of the vessel 3, as measured by the first temperature sensor 8, is overheating, while the material temperature in the central area, as measured by the second temperature sensor 9, is still at a low level, and the average temperature of the two points is still within the normal set range, the system determines that there is uneven local heating. Then, the control module controls the second motor 16 to drive the bevel gear 12 to rotate, which in turn drives multiple bevel gears 13 to rotate synchronously, causing each drive screw 14 to rotate and drive the drive block 15 to slide away from the transmission chamber 11. This causes multiple heating covers 10 to move away from the vessel 3, reducing the heat input intensity of the inner wall area. This process does not directly cut off the heating power supply, but achieves dynamic control by adjusting the heating distance. This effectively suppresses local overheating and avoids energy waste and equipment damage caused by frequent start-stop of the heating covers 10. After the adjustment is completed, the stirring system continues to run. Once the information processing module confirms that the inner wall temperature has returned to the normal range, the control module drives the heating covers 10 to reset and re-attach to the outer wall of the vessel 3, restoring uniform heating. If the information processing module determines that the average temperature of the two points measured by the first temperature sensor 8 and the second temperature sensor 9 has exceeded the normal temperature threshold, it will determine that there is an overall risk of overheating. At this time, the temperature controller 202 will control the heating cover 10 to stop heating. During the heating stop, the spiral stirring blade 6 and the scraper frame 7 will continue to operate to promote the thermal equilibrium of the material in the kettle. After the temperature of both points drops back to the safe range, the heating cover 10 will be restarted to carry out the hot melting operation.

[0032] Benefits of implementation: By setting the first temperature sensor 8 and the second temperature sensor 9 in the inner wall area and the central area of ​​the vessel body 3 respectively, a dual-point collaborative temperature measurement mechanism is constructed to directly sense the actual temperature of the material, avoiding the response lag or misjudgment caused by traditional indirect temperature measurement. The system can dynamically judge the thermal state based on the temperature difference and average temperature, actively adjust the heating intensity, and improve the real-time performance and accuracy of temperature control. When local overheating is detected but the overall temperature is normal, the heating cover 10 is moved away from the vessel body 3 to reduce the heat input intensity instead of directly cutting off the power supply. This avoids the heating system from repeatedly starting and stopping due to uneven heating, reduces energy waste, extends the service life of the heating element, and ensures a continuous and stable melting process. In addition, both local temperature difference regulation and overall over-temperature protection can be automatically completed and restored without manual intervention, thus improving the intelligence level of the equipment and operational safety.

[0033] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described herein. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present invention, as well as all technical solutions and improvements that do not depart from the spirit and scope of the invention, are covered within the scope of the claims of the present invention.

Claims

1. A hot melting kettle with anti-burning function, comprising a supporting seat (1), the upper end of the supporting seat (1) is fixedly provided with a protective cover (2), the inner side of the protective cover (2) is provided with a kettle body (3), characterized in that: The upper end of the protective cover (2) is fixedly installed with a first motor (4), the inside of the vessel body (3) is provided with a rotating shaft (5), the outside of the rotating shaft (5) is fixedly installed with a spiral stirring blade (6), the outside of the spiral stirring blade (6) is provided with a scraping frame (7), the surface of the scraping frame (7) is fixedly installed with a first temperature sensor (8), the outside of the rotating shaft (5) is fixedly installed with a second temperature sensor (9), the outside of the vessel body (3) is provided with a heating cover (10), the lower end of the vessel body (3) is provided with a transmission chamber (11), the inside of the transmission chamber (11) is provided with a bevel gear one (12), the outside of the bevel gear one (12) is provided with a bevel gear two (13), the outside of the transmission chamber (11) is provided with a drive screw (14), the outside of the drive screw (14) is threadedly connected with a drive block (15), and the lower end of the support base (1) is fixedly installed with a second motor (16).

2. The hot melt kettle with anti-burning function according to claim 1, characterized in that: The upper end of the vessel body (3) extends to the outside of the protective cover (2) and is connected to the feed port (301), and the lower end of the vessel body (3) extends to the outside of the support base (1) and is connected to the discharge port (302).

3. The hot melt kettle with anti-burning function according to claim 2, characterized in that: The upper end of the rotating shaft (5) is rotatably connected to the vessel body (3), the output end of the first motor (4) is connected to the upper end of the rotating shaft (5) through a sprocket assembly, the scraping frame (7) is fixedly connected to the outer side of the rotating shaft (5), and the outer side of the scraping frame (7) is in contact with the inner wall of the vessel body (3).

4. The hot melt kettle with anti-burning function according to claim 3, characterized in that: The upper end of the protective cover (2) is provided with a central control box (201). The central control box (201) is provided with an information processing module and a control module. The control module and the information processing module are electrically connected. The first temperature sensor (8) and the second temperature sensor (9) are both electrically connected to the information processing module. The first temperature sensor (8) and the second temperature sensor (9) are located at the same height.

5. The hot melt kettle with anti-burning function according to claim 4, characterized in that: The heating cover (10) is arranged in a ring array along the outer periphery of the vessel body (3), and its inner contour is adapted to the outer wall of the vessel body (3). The heating cover (10) is an arc-shaped heating plate with built-in heating wire. A temperature controller (202) is fixedly installed on the outside of the protective cover (2). The temperature controller (202) is electrically connected to the information processing module. The heating cover (10) and the temperature controller (202) are electrically connected.

6. The hot melt kettle with anti-burning function according to claim 5, characterized in that: A heat insulation plate (111) is fixedly installed at the upper end of the transmission chamber (11). The heat insulation plate (111) is fixedly connected to the lower end of the vessel body (3). The lower edge of the heating cover (10) and the side of the heat insulation plate (111) are adapted to each other. The output end of the second motor (16) extends to the inner side of the transmission chamber (11) and is fixedly connected to the bevel gear (12). The second motor (16) is electrically connected to the control module.

7. The hot melt kettle with anti-burning function according to claim 6, characterized in that: The second bevel gear (13) is arranged in a ring array around the first bevel gear (12) and meshes with the first bevel gear (12). One end of the drive screw (14) is rotatably connected to the transmission chamber (11) and extends to the inner side of the transmission chamber (11) and is fixedly connected to the second bevel gear (13). The other end of the drive screw (14) is rotatably connected to the upper end of the support base (1) through the support plate (101).

8. The hot melt kettle with anti-burning function according to claim 7, characterized in that: The drive screw (14) and drive block (15) are arranged in a ring array around the transmission chamber (11). The upper end of the drive block (15) is fixedly connected to the lower end of the heating cover (10), and the lower end of the drive block (15) is slidably connected to the surface of the support base (1) via a slide rail.

9. A method of using a hot melt kettle having an anti-burnout function, characterized by: The hot melt kettle with anti-overheating function as described in any one of claims 1-8 is operated as follows: When in use, the material is added into the vessel body (3) through the feed port (301). The heating cover (10) is finely managed by the temperature controller (202) to heat the vessel body (3). The output end of the first motor (4) drives the rotating shaft (5) to rotate through the sprocket assembly, thereby driving the spiral stirring blade (6) to mix and stir the material. The scraping frame (7) rotates synchronously with the rotating shaft (5). Its outer edge is always in close contact with the inner wall of the vessel body (3) to continuously scrape the material close to the inner wall, effectively preventing the phenomenon of hanging, carbonization or decomposition caused by the material staying in the high temperature area. It significantly improves the material flowability and heating uniformity in the area close to the vessel wall. During the stirring process, the first temperature sensor (8) is used to monitor the material temperature in the area close to the inner wall of the vessel body (3) in real time, and the second temperature sensor (9) is used to detect the material temperature in the central area. The two sensors synchronously collect temperature data at different radial positions in the vessel and transmit the signal to the information processing module in the central control box (201). When the information processing module determines that the material temperature near the inner wall of the vessel body (3) measured by the first temperature sensor (8) is overheated, while the material temperature in the central area measured by the second temperature sensor (9) is still at a low level, and the average temperature of the two points is still within the normal setting range, the system determines that the local heating is uneven. Then, the control module controls the second motor (16) to drive the first bevel gear (12) to rotate, thereby driving multiple second bevel gears (13) to rotate synchronously, so that each drive screw (14) rotates and drives the drive block (15) to slide away from the transmission. The heat input intensity of the inner wall area is reduced by moving multiple heating covers (10) away from the vessel body (3) and reducing the heat input intensity of the inner wall area. This process does not directly cut off the heating power supply, but achieves dynamic control by adjusting the heating distance. This effectively suppresses local overheating and avoids energy waste and equipment damage caused by frequent start-stop of the heating covers (10). After the adjustment is completed, the stirring system continues to run. When the information processing module confirms that the inner wall temperature has returned to the normal range, the control module drives the heating covers (10) to reset and re-attach to the outer wall of the vessel body (3) to restore uniform heating. If the information processing module determines that the average temperature of the two points measured by the first temperature sensor (8) and the second temperature sensor (9) has exceeded the normal temperature threshold, it is determined that there is an overall risk of overheating. At this time, the temperature controller (202) controls the heating cover (10) to stop heating. During the heating stop, the spiral stirring blade (6) and the scraping frame (7) continue to operate to promote the thermal equilibrium of the material in the kettle. After the temperature of both points drops back to the safe range, the heating cover (10) is restarted to carry out the hot melting operation.

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