Ceramic clay high-shear mixing and extruding mechanism

Abstract

This invention provides a high-shear mixing and extrusion mechanism for ceramic clay, belonging to the field of ceramic processing. It includes a base plate, with a mixing and extrusion mechanism on top of the base plate for shearing and extruding ceramic clay. A stirring component on top of the mixing and extrusion mechanism disperses large clay particles. Through the mixing and extrusion mechanism, a first motor drives a rotating rod and spiral blades to rotate, propelling the clay forward along the mixing channel. Heat is transferred to the ceramic clay inside the heating element, and the clay is extruded through a die. Heating reduces viscosity, improving mixing efficiency. A cooling component ensures the clay temperature remains within the optimal processing range. The stirring component adds the ceramic clay to a mixing tank, and a second motor drives a crossbar and stirring blades to rotate, achieving a uniform state. The mixed clay then falls into the mixing channel through a feeding pipe for subsequent processing.

Description

Technical Field

[0001] This utility model relates to the field of ceramic processing, and more specifically, to a high-shear mixing and extrusion mechanism for ceramic clay. Background Technology

[0002] Ceramic clay is a mixture of plastic raw materials, lean raw materials, and fluxing raw materials. High-shear mixing can refine the clay structure, improve its uniformity and consistency, thereby improving the quality and performance of ceramic products. High-shear mixing extrusion plays an important role in improving the quality of ceramic products, increasing production efficiency, and precisely controlling product characteristics. However, existing high-shear mixing extrusion mechanisms for ceramic clay still have the following shortcomings:

[0003] (1) During the high-shear mixing process, the existing extruder will generate a lot of heat due to the high speed of the equipment and friction. Without the cooling components, the temperature of the mud may be too high. High temperature will cause the viscosity of the mud to change, affecting its processing performance, and may even cause the mud to harden prematurely, affecting the subsequent extrusion effect.

[0004] (2) Although existing high-shear mixing extruders can improve the uniformity of clay to a certain extent, they may cause uneven dispersion when processing clay with high particle size or large particles, thus affecting the quality of the product. To address this, a high-shear mixing extrusion mechanism for ceramic clay is proposed. Utility Model Content

[0005] The purpose of this invention is to address the problem that existing high-shear mixing and extrusion mechanisms for ceramic clay generate a large amount of heat during the high-shear mixing process due to the high-speed operation and friction of the equipment. Without cooling components, the temperature of the clay may become too high, which can lead to changes in the viscosity of the clay, affecting its processing performance and even causing premature hardening of the clay, thus affecting the subsequent extrusion effect.

[0006] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0007] The present invention is as follows: a high-shear mixing and extrusion mechanism for ceramic clay, including a base plate, a mixing and extrusion mechanism for shearing and extruding ceramic clay is provided on the top of the base plate, and a stirring component for dispersing large particles of clay is provided on the top of the mixing and extrusion mechanism.

[0008] The mixing and extrusion mechanism includes a support plate fixedly connected to the top of the base plate, a housing fixedly connected to the top of the support plate, a support plate fixedly connected to the bottom inner part of the housing, a mixing channel fixedly connected to the top of the support plate, a heating keel provided outside the mixing channel, a first motor bolted to the side wall of the mixing channel, a rotating rod fixedly connected to the output end of the first motor, a spiral blade welded to the side wall of the rotating rod, a discharge hopper connected to the end of the mixing channel away from the first motor, an extrusion die provided on one side of the discharge hopper, and a cooling assembly provided on one side of the housing.

[0009] As a preferred technical solution of this utility model, the cooling assembly includes a water storage tank disposed on the top of the base plate, a water pump disposed on the top of the water storage tank, an inlet pipe connected to the input end of the water pump, a water delivery pipe connected to the output end of the water pump, a connecting pipe connected to the side wall at the bottom of the water storage tank, a water injection pipe connected to the top of the water storage tank, a sealing cap threadedly connected to the outer wall at the top of the water injection pipe, a heater and a cooler respectively disposed on the two opposite inner walls of the water storage tank, a first temperature sensor disposed on the inner bottom wall of the water storage tank, and a partition fixedly connected to the inner wall of the shell.

[0010] As a preferred technical solution of this utility model, the stirring assembly includes a support column fixedly connected to the shell, a stirring tank fixedly connected to the top of the support column, a feed hopper connected to the top of the stirring tank, a second motor bolted to the side wall of the stirring tank, a crossbar fixedly connected to the output end of the second motor, a stirring blade fixedly connected to the side wall of the crossbar, a feeding pipe connected to the bottom of the stirring tank, and a solenoid valve provided on the side wall of the feeding pipe.

[0011] As a preferred technical solution of this utility model, a filter screen is provided at the end of the mixing channel away from the first motor, and a perforated plate is provided on one side of the filter screen.

[0012] As a preferred technical solution of this utility model, a fixing ring is fixedly connected to the side wall of the crossbar, a rotating blade is welded to the side wall of the fixing ring, and a scraper is fixedly connected to one end of the rotating blade.

[0013] As a preferred technical solution of this utility model, two semi-circular rings are slidably connected to the outer side of the extrusion mold, and splicing blocks are fixedly connected to the side walls of the two semi-circular rings. Bolts are threadedly connected to the top of the splicing blocks, and fasteners are threadedly connected to the side walls at the bottom of the bolts.

[0014] As a preferred technical solution of this utility model, a second temperature sensor is provided on the inner top wall of the housing, and a control panel is provided on the outer side wall of the housing. The first and second temperature sensors are electrically connected to the control panel.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. Through the set mixing and extrusion mechanism, when the ceramic clay falls into the mixing channel, the first motor drives the rotating rod and the spiral blade to rotate, pushing the clay forward along the mixing channel. At the same time, the heating keel outside the mixing channel starts to work, and the heat is transferred to the ceramic clay inside. After being fully mixed, the ceramic clay is pushed to the discharge hopper by the spiral blade. Under the action of the extrusion die, the clay is squeezed into the required shape. Heating can reduce the viscosity and improve the mixing efficiency. The cooling component water pump delivers water to the inside of the shell through the water pipe connected to the output end. Cooling can effectively control the heat generated by the equipment during the high shear process and ensure that the temperature of the clay is always kept within the optimal processing range.

[0017] 2. With the set-up stirring components, the operator puts the ceramic clay into the mixing tank through the feed hopper, starts the second motor, and the second motor drives the crossbar and stirring blades to rotate. The stirring blades stir the ceramic clay in the mixing tank, and the materials are fully mixed to achieve a uniform state. After the ceramic clay is stirred, the solenoid valve is opened, and the stirred clay falls into the mixing channel through the feeding pipe for subsequent processing. Stirring helps to evenly mix different types and sizes of clay, avoiding uneven distribution of clay in the subsequent high-shear mixing process, ensuring that the composition of each part of the clay is consistent, thereby improving product quality. Attached Figure Description

[0018] Figure 1 A schematic diagram of the high-shear mixing and extrusion mechanism for ceramic clay provided by this utility model;

[0019] Figure 2 A schematic diagram of the control panel structure of the high-shear mixing and extrusion mechanism for ceramic clay provided by this utility model;

[0020] Figure 3 This is a partial structural diagram of the mixing and extrusion mechanism of the high-shear mixing and extrusion mechanism for ceramic clay provided by this utility model.

[0021] Figure 4 A schematic diagram of the cooling component structure of the high-shear mixing and extrusion mechanism for ceramic clay provided by this utility model;

[0022] Figure 5 A schematic diagram of the partition structure of the high-shear mixing and extrusion mechanism for ceramic clay provided by this utility model;

[0023] Figure 6 A schematic diagram of the stirring assembly structure of the high-shear mixing and extrusion mechanism for ceramic clay provided by this utility model.

[0024] The diagram shows: 1. Base plate; 2. Mixing and extrusion mechanism; 3. Mixing assembly; 4. Filter screen; 5. Perforated plate; 6. Fixing ring; 7. Rotating blade; 8. Scraper; 9. Semicircular ring; 10. Connecting block; 11. Bolt; 12. Fastener; 13. Second temperature sensor; 14. Control panel; 201. Support plate; 202. Housing; 203. Support plate; 204. Mixing channel; 205. Heating keel; 206. First motor; 207. Rotating rod; 208. Spiral blade; 209. Discharge hopper; 210. Extrusion die; 21 1. Cooling assembly; 21101. Water tank; 21102. Water pump; 21103. Water inlet pipe; 21104. Water delivery pipe; 21105. Connecting pipe; 21106. Water injection pipe; 21107. Sealing cover; 21108. Heater; 21109. Cooler; 21110. First temperature sensor; 21111. Partition plate; 301. Support column; 302. Mixing tank; 303. Feed hopper; 304. Second motor; 305. Crossbar; 306. Mixing blade; 307. Feeding pipe; 308. Solenoid valve. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0026] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0027] 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.

[0028] 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.

[0029] like Figure 1 As shown, this embodiment proposes a high-shear mixing and extrusion mechanism for ceramic clay, including a base plate 1, a mixing and extrusion mechanism 2 for shearing and extruding ceramic clay at the top of the base plate 1, and a stirring component 3 for dispersing large particles of clay at the top of the mixing and extrusion mechanism 2.

[0030] like Figure 3 , Figure 4 and Figure 5 As shown, the mixing and extrusion mechanism 2 includes a support plate 201 fixedly connected to the top of the base plate 1. A housing 202 is fixedly connected to the top of the support plate 201. The support plate 201 ensures the stability of the housing 202 during operation, preventing it from shifting or shaking due to vibration or external force. The housing 202 prevents external dust and impurities from entering and also reduces noise transmission. A support plate 203 is fixedly connected to the bottom inner part of the housing 202. A mixing channel 204 is fixedly connected to the top of the support plate 203. The support plate 203 supports the mixing channel 204, enabling it to properly mix and transport ceramic clay. The mixing channel 204 ensures that the various components in the clay are fully and evenly mixed. A heating keel 20 is provided on the outside of the mixing channel 204. 5. The heating keel 205 is used to heat the ceramic clay in the mixing channel 204, which can increase the temperature of the ceramic clay, reduce its viscosity, and make it easier to mix and transport. A first motor 206 is bolted to the side wall of the mixing channel 204. A rotating rod 207 is fixedly connected to the output end of the first motor 206. A spiral blade 208 is welded to the side wall of the rotating rod 207. The first motor 206 serves as a power source, providing power for the rotation of the spiral blade 208. The rotating rod 207 transmits the power generated by the first motor 206 to the spiral blade 208, enabling the spiral blade 208 to rotate around the rotating rod 207, thus mixing and transporting the ceramic clay. The spiral blade 208 generates shearing force, extrusion force, and pushing force on the ceramic clay. The clay material is continuously tumbled and mixed within the mixing channel 204. A discharge hopper 209 is connected to the end of the mixing channel 204 furthest from the first motor 206. An extrusion die 210 is located on one side of the discharge hopper 209. The discharge hopper 209 ensures that the clay material can smoothly enter the extrusion die 210 from the mixing channel 204, preventing leakage or blockage. Under the action of the extrusion die 210, the clay material is extruded into a specific shape for subsequent processing. A cooling assembly 211 is located on one side of the housing 202. When ceramic clay material falls into the mixing channel 204, the first motor 206 starts, and its output drives the rotating rod 207 to rotate, which in turn causes the spiral blades 208 to rotate. The spiral blades 208 generate a pushing force on the ceramic clay material. The clay is pushed forward along the mixing channel 204. At the same time, the heating keel 205 outside the mixing channel 204 starts to work, heating the mixing channel 204. The heat is transferred to the ceramic clay inside, raising the temperature of the clay. The clay is continuously subjected to high shear force in the mixing channel 204. After being fully mixed, the ceramic clay is pushed to the discharge hopper 209 by the spiral blades 208. The discharge hopper 209 guides the clay to the extrusion die 210. Under the action of the extrusion die 210, the ceramic clay is squeezed and squeezed into the required shape through the specific shaped channel of the die. Heating can reduce viscosity, reducing problems such as excessive equipment load and increased energy consumption caused by poor clay flow, while also improving mixing efficiency.

[0031] like Figure 4and Figure 5 As shown, the cooling assembly 211 includes a water tank 21101 disposed on the top of the base plate 1. The water tank 21101 provides a stable water source to ensure a continuous supply of cooling water during extruder operation to meet cooling requirements. A water pump 21102 is disposed on the top of the water tank 21101. The water pump 21102 is the power source for cooling water circulation. The input end of the water pump 21102 is connected to a water inlet pipe 21103, which ensures that cooling water can be normally drawn by the water pump 21102. The output end of the water pump 21102 is connected to a water delivery pipe 21104, which ensures that the cooling water is accurately delivered to the target location. Upon reaching the target area, the mud material is effectively cooled. A connecting pipe 21105 is installed on the side wall of the bottom of the water storage tank 21101. The connecting pipe 21105 is used for the return flow of cooling water, achieving water recycling and reducing water waste. A water injection pipe 21106 is installed on the top of the water storage tank 21101 to replenish cooling water. A sealing cap 21107 is threaded onto the outer wall of the top of the water injection pipe 21106 to prevent dust, impurities, etc., from entering the water storage tank 21101. Two opposing inner walls of the water storage tank 21101 are respectively equipped with… The heater 21108 and cooler 21109 are configured. The heater 21108 can adjust the temperature of the cooling water according to actual needs to meet the cooling requirements of the extruder under different operating conditions. When the cooling water temperature is too high, the cooler 21109 can cool the cooling water to ensure that the temperature of the cooling water is always kept within a suitable range, thereby ensuring the cooling effect. A first temperature sensor 21110 is installed on the inner bottom wall of the water storage tank 21101. The first temperature sensor 21110 is used to monitor the temperature of the cooling water in the water storage tank 21101 in real time to achieve precise control of the cooling water temperature. A partition 21 is fixedly connected to the inner wall of the shell 202. 111, the partition 21111 serves to separate the space, ensuring that heating and cooling operations do not interfere with each other. During use, the water pump 21102 draws cooling water from the water storage tank 21101. After pressurizing the drawn cooling water, the water pump 21102 delivers it to the inside of the shell 202 through the water supply pipe 21104 connected to the output end. It absorbs the heat generated during the heating process, thereby reducing the temperature of the mud. The cooling water is recycled through the connecting pipe 21105, ensuring that the temperature of the mud is always kept within the optimal processing range. This can prevent the viscosity change of the mud due to overheating, thereby ensuring the stability and fluidity of the mud and helping to improve the processing effect.

[0032] like Figure 6As shown, the mixing assembly 3 includes a support column 301 fixedly connected to the housing 202. A mixing tank 302 is fixedly connected to the top of the support column 301. The support column 301 provides support for the mixing tank 302, ensuring stable operation during operation. The mixing tank 302 provides space for mixing, blending, and homogenizing large pieces of mud, achieving a uniform state. A feed hopper 303 is connected to the top of the mixing tank 302, facilitating the operator to feed materials into the mixing tank 302. A [missing information - likely a device or component] is bolted to the side wall of the mixing tank 302. The second motor 304 has a crossbar 305 fixedly connected to its output end. A stirring blade 306 is fixedly connected to the side wall of the crossbar 305. The second motor 304 provides the power source for the rotation of the stirring blade 306, which ensures thorough mixing of the materials, improving the quality and uniformity of the clay. A feeding pipe 307 is connected to the bottom of the mixing tank 302, used to deliver the mixed ceramic clay from the mixing tank 302 into the mixing channel 204. An electric motor is installed on the side wall of the feeding pipe 307. The solenoid valve 308 controls the opening and closing of the feed pipe 307, thereby controlling the conveying volume and time of the ceramic clay, ensuring that the extruder operates according to the predetermined process requirements. During operation, the operator feeds the ceramic clay into the mixing tank 302 through the feed hopper 303 and starts the second motor 304. The output of the second motor 304 drives the crossbar 305 to rotate, causing the stirring blades 306 on the crossbar 305 to rotate accordingly. The stirring blades 306 stir the ceramic clay within the mixing tank 302. The rotation of the stirring blades 306... The shear force, diffusion, and convection generated by the rotation cause relative movement of the materials, increasing the interfacial area between different components and ensuring thorough mixing to achieve a uniform state. After the ceramic clay is mixed, the solenoid valve 308 is opened, and the mixed clay falls into the mixing channel 204 through the feeding pipe 307 for subsequent processing. Mixing helps to evenly mix different types and sizes of clay, preventing uneven distribution of clay during subsequent high-shear mixing and ensuring that the composition of each part of the clay is consistent, thereby improving product quality.

[0033] like Figure 1 As shown, a filter screen 4 is provided at the end of the mixing channel 204 away from the first motor 206. A perforated plate 5 is provided on one side of the filter screen 4. The filter screen 4 removes impurities and large particles from the mud, and the perforated plate 5 further optimizes the fluidity and uniformity of the mud. The solid particles in the mud can be better and more uniformly dispersed, ensuring a more consistent mixing effect.

[0034] like Figure 1As shown, a fixing ring 6 is fixedly connected to the side wall of the crossbar 305, and a rotating blade 7 is welded to the side wall of the fixing ring 6. A scraper 8 is fixedly connected to one end of the rotating blade 7. The rotating blade 7 drives the scraper 8 to rotate together. The scraper 8 can directly scrape off the ceramic clay adhering to the inner wall of the mixing tank 302, prevent the material from accumulating and clumping on the tank wall, and ensure that the material in the mixing tank 302 can fully participate in the mixing and kneading process, thereby improving the uniformity of the material mixing.

[0035] like Figure 1 As shown, two semicircular rings 9 are slidably connected to the outer side of the extrusion mold 210. A splicing block 10 is fixedly connected to the side wall of the two semicircular rings 9. A bolt 11 is threadedly connected to the top of the splicing block 10, and a fastener 12 is threadedly connected to the side wall of the bottom of the bolt 11. The two semicircular rings 9 can be opened and closed or adjusted in position around the extrusion mold 210. Under the action of the bolt 11 and the fastener 12, the extrusion mold 210 can be quickly switched and fixed to adapt to different mold types, thereby improving the convenience of operation and production efficiency.

[0036] like Figure 1 and Figure 2 As shown, a second temperature sensor 13 is provided on the inner top wall of the housing 202, and a control panel 14 is provided on the outer side wall of the housing 202. The first temperature sensor 21110 and the second temperature sensor 13 are electrically connected to the control panel 14. The second temperature sensor 13 can accurately measure the temperature value and provide data support for the temperature control of the equipment. The control panel 14 can receive the temperature signal transmitted from the temperature sensor and realize precise temperature control.

[0037] Specifically, in use, the high-shear mixing and extrusion mechanism for ceramic clay works as follows: The operator feeds the ceramic clay into the mixing tank 302 through the feed hopper 303, starts the second motor 304, which drives the crossbar 305 and the mixing blades 306 to rotate. The mixing blades 306 stir the ceramic clay within the mixing tank 302. Through the shear force, diffusion, and convection generated by the rotation of the mixing blades 306, the material is thoroughly mixed to achieve a uniform state. After the ceramic clay is stirred, the solenoid valve 308 is opened, and the stirred clay falls into the mixing channel 204 through the feed pipe 307 (e.g., ...). Figure 6As shown), the first motor 206 starts, and its output drives the rotating rod 207 to rotate, which in turn causes the spiral blades 208 to rotate. The spiral blades 208 generate a pushing force on the ceramic clay, pushing the clay forward along the mixing channel 204. At the same time, the heating keel 205 outside the mixing channel 204 starts working, heating the mixing channel 204. The heat is transferred to the ceramic clay inside, raising the temperature of the clay. The fully mixed ceramic clay is pushed by the spiral blades 208 to the discharge hopper 209 area, where it is then discharged. Water pump 21102 draws cooling water from water storage tank 21101. After pressurizing the drawn-in cooling water, the pump 21102 delivers it to the interior of housing 202 through water pipe 21104 connected to the output end. This absorbs the heat generated during the heating process, thereby reducing the temperature of the clay. Finally, discharge hopper 209 guides the clay to extrusion die 210. Under the action of extrusion die 210, the ceramic clay is compressed and squeezed into the desired shape through the specific shaped channels of the die, facilitating subsequent processing (such as...). Figure 3 , Figure 4 and Figure 5 (As shown).

[0038] All technical features in this embodiment can be freely combined according to actual needs.

[0039] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A ceramic paste high shear mixing extrusion mechanism comprising a base plate (1), characterized in that, The top of the base plate (1) is provided with a mixing and extrusion mechanism (2) for shearing and extruding ceramic clay, and the top of the mixing and extrusion mechanism (2) is provided with a stirring assembly (3) for dispersing large clay particles. The mixing and extrusion mechanism (2) includes a support plate (201) fixedly connected to the top of the base plate (1), a housing (202) fixedly connected to the top of the support plate (201), a support plate (203) fixedly connected to the bottom of the housing (202), a mixing channel (204) fixedly connected to the top of the support plate (203), a heating keel (205) provided on the outside of the mixing channel (204), a first motor (206) bolted to the side wall of the mixing channel (204), a rotating rod (207) fixedly connected to the output end of the first motor (206), a spiral blade (208) welded to the side wall of the rotating rod (207), a discharge hopper (209) connected to the end of the mixing channel (204) away from the first motor (206), an extrusion die (210) provided on one side of the discharge hopper (209), and a cooling assembly (211) provided on one side of the housing (202).

2. The high-shear mixing and extrusion mechanism for ceramic clay according to claim 1, characterized in that, The cooling assembly (211) includes a water tank (21101) disposed on the top of the base plate (1). A water pump (21102) is disposed on the top of the water tank (21101). An inlet pipe (21103) is connected to the input end of the water pump (21102), and a water delivery pipe (21104) is connected to the output end of the water pump (21102). A connecting pipe (21105) is connected to the side wall at the bottom of the water tank (21101). A water injection pipe (21106) is connected to the top of the water tank (21101). A sealing cap (21107) is threaded onto the outer wall of the top of the water injection pipe (21106). A heater (21108) and a cooler (21109) are respectively installed on the two opposite inner walls of the water tank (21101). A first temperature sensor (21110) is installed on the inner bottom wall of the water tank (21101). A partition (21111) is fixedly connected to the inner wall of the shell (202).

3. The high-shear mixing and extrusion mechanism for ceramic clay according to claim 1, characterized in that, The stirring assembly (3) includes a support column (301) fixedly connected to the housing (202). A stirring tank (302) is fixedly connected to the top of the support column (301). A feed hopper (303) is connected to the top of the stirring tank (302). A second motor (304) is bolted to the side wall of the stirring tank (302). A crossbar (305) is fixedly connected to the output end of the second motor (304). A stirring blade (306) is fixedly connected to the side wall of the crossbar (305). A feeding pipe (307) is connected to the bottom of the stirring tank (302). A solenoid valve (308) is provided on the side wall of the feeding pipe (307).

4. The high-shear mixing and extrusion mechanism for ceramic clay according to claim 1, characterized in that, A filter screen (4) is provided at the end of the mixing channel (204) away from the first motor (206), and a perforated plate (5) is provided on one side of the filter screen (4).

5. The high-shear mixing and extrusion mechanism for ceramic clay according to claim 3, characterized in that, A fixing ring (6) is fixedly connected to the side wall of the crossbar (305), and a rotating blade (7) is welded to the side wall of the fixing ring (6). A scraper (8) is fixedly connected to one end of the rotating blade (7).

6. The high-shear mixing and extrusion mechanism for ceramic clay according to claim 1, characterized in that, Two semicircular rings (9) are slidably connected to the outer side of the extrusion die (210). A splicing block (10) is fixedly connected to the side wall of the two semicircular rings (9). A bolt (11) is threadedly connected to the top of the splicing block (10). A fastener (12) is threadedly connected to the side wall at the bottom of the bolt (11).

7. The high-shear mixing and extrusion mechanism for ceramic clay according to claim 2, characterized in that, A second temperature sensor (13) is provided on the inner top wall of the housing (202), and a control panel (14) is provided on the outer side wall of the housing (202). The first temperature sensor (21110) and the second temperature sensor (13) are electrically connected to the control panel (14).

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