A heating and heat-insulating lead pot and its use method

Abstract

The present invention relates to the technical field of lead-acid battery processing and production, and particularly to a heating and heat-insulating lead pot and a method for using the same. The heating and heat-insulating lead pot comprises a bracket, a lead pot, and a heat-insulating and heating component. The bracket is arranged in a frame shape, and the lead pot is supported and installed on the bracket. The lead pot is arranged in upper and lower layers. The lead pot comprises a heat-insulating zone located on an upper layer and a heating zone located on a lower layer. The heat-insulating zone insulates lead liquid. The heating zone is arranged in an inverted frustum shape, and the heating zone performs heat-melting on lead blocks. The heat-insulating and heat-insulating component performs heat-insulating and heat-treating treatment on the heat-insulating zone and the heating zone respectively. The heat-insulating and heat-insulating component comprises a heating element, and the heating element is arranged around the outside of the heating zone. By adopting electromagnetic induction heating technology, the heating and heat-insulating lead pot of the present invention can achieve rapid temperature increase, greatly improve heating efficiency, and shorten production cycle. The unique magnetic field distribution design and annular groove layout ensure that the lead liquid is heated evenly, and effectively avoid product quality problems caused by uneven temperature.

Description

Technical Field

[0001] The invention relates to the technical field of lead-acid battery processing and production, and in particular to a heating and heat-insulating lead pot and a use method thereof. Background Art

[0002] In modern industrial production, lead is widely used in battery manufacturing, cable sheathing, chemical corrosion protection, building materials, and many other fields. In these applications, lead blocks often need to be heated and melted into liquid lead to meet the requirements of subsequent processing steps, such as casting and coating. Throughout this entire process, the heating and insulation lead pot is a key piece of equipment, and its performance directly affects the quality of the liquid lead and production efficiency.

[0003] Traditional lead pots with heating and insulation have exposed numerous problems in practical use. Common heating methods, such as resistance wire heating, have low thermal efficiency and slow heating rates, resulting in high energy consumption and long production cycles. Furthermore, this heating method can easily lead to uneven temperature distribution within the pot, causing localized overheating or underheating of the molten lead, impacting the quality and stability of the lead products. Furthermore, regarding insulation, the traditional pot's poorly designed insulation structure results in rapid heat loss, making it difficult to maintain the molten lead at a suitable operating temperature for extended periods. This not only increases energy costs but can also cause the molten lead to solidify, impacting production continuity.

[0004] With the continuous advancement of industrial technology, higher requirements are being placed on the quality and production efficiency of lead products. At the same time, the concepts of environmental protection and energy conservation are becoming increasingly popular, prompting companies to seek more efficient, energy-saving, and environmentally friendly heating and insulation equipment. Therefore, the development of a heating and insulation lead pot and its use method that can quickly and evenly heat lead blocks, effectively maintain the temperature of the lead liquid, and is energy-saving and environmentally friendly is of great practical significance and will also have a positive impact on promoting the development of the lead processing industry. Summary of the Invention

[0005] In response to existing technical problems, the present invention aims to provide a heating and insulation lead pot and a method for using the same. By adopting electromagnetic induction heating technology, the heating and insulation lead pot of the present invention can achieve rapid heating, greatly improve heating efficiency, and shorten the production cycle. The unique magnetic field distribution design and ring groove layout ensure that the lead liquid is heated evenly, effectively avoiding product quality problems caused by uneven temperature. In terms of insulation, an auxiliary heating component is provided to continuously heat the lead liquid, so that the lead liquid can always maintain a stable temperature, ensuring production continuity and consistency of product quality.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A heating and heat preservation lead pot, comprising a bracket, a lead pot and a heat preservation and heating component;

[0008] The bracket is arranged in a frame shape, and the bracket carries and installs the lead pot;

[0009] The lead pot is arranged in an upper and lower layered manner, and includes a heat preservation zone located in the upper layer and a heating zone located in the lower layer. The heat preservation zone is used to keep the lead liquid warm, and the heating zone is arranged in an inverted frustum shape to heat-smelt the lead block.

[0010] The heat preservation and heating component performs heat preservation and heating treatment on the heat preservation zone and the heating zone respectively. The heat preservation and heating component includes a heating element which is arranged around the outside of the heating zone and is a magnetic induction heating coil.

[0011] As an improvement, the wall thickness h of the heating zone and the skin depth δ satisfy the relationship: 3.2δ>h>3δ, where the skin depth δ= = , ρ is the conductor resistivity, ω is the angular frequency, ω=2πf, f is the current frequency, μ is the conductor magnetic permeability, μ=μ0μ r , μ0 is the vacuum permeability, μ0=4π×10 -7 H / m, μ r is the relative magnetic permeability.

[0012] As an improvement, the side wall of the heating zone is provided with a plurality of groups of annular grooves protruding inwardly, and the side wall of the heating zone is provided with ribs protruding inwardly along the vertical direction.

[0013] As an improvement, a magnetic flux concentrator is provided on the outer side of the bottom of the heating zone, and the magnetic flux concentrator is a U-shaped silicon steel sheet magnetic conductor.

[0014] As an improvement, the outer side of the lead pot is wrapped with a heat-insulating material, which is at least one layer of aluminum foil or ceramic fiber blanket.

[0015] As an improvement, the heating element is wound with a gradually expanding coil spacing along the depth direction of the heating zone, so that the density of turns of the heating element at the top of the heating zone is less than the density of turns of the heating element at the bottom of the heating zone.

[0016] As an improvement, an air gap is provided between the heating element and the outer side wall of the heating zone, and the distance h of the air gap and the diameter φ of the heating element satisfy the relationship: 1φ≤h≤2φ;

[0017] The heating element is installed on the outside of the heating zone through a supporting assembly.

[0018] As an improvement, the heating element adopts a copper tube embedded liquid cooling structure, and the cooling liquid temperature is controlled at 30-50°C.

[0019] As an improvement, the heat preservation and heating assembly further includes a heat preservation element arranged in the heat preservation zone, the heat preservation element is an electric heating wire, and the heat preservation element extends downward from the top of the heat preservation zone and is inserted into the bottom of the heat preservation zone.

[0020] In addition, the present invention also provides a method for using a heating and heat-insulating lead pot, comprising the following steps:

[0021] Step 1: Place the lead block, open the lead pot, and place the lead block to be melted into the heating area of ​​the lead pot;

[0022] Step 2: Start the heat preservation and heating assembly and connect the alternating current to the heating element. When the heating element is energized, an alternating magnetic field is generated. This alternating magnetic field penetrates the side wall of the lead pot and acts on the heating zone of the lead pot and the lead block inside. The alternating magnetic field generates an induced electromotive force in the conductor, which in turn forms an induced current in the annular grooves and ribs inside the heating zone. When the current passes through the annular grooves and ribs, it generates heat, which begins to heat the lead block in the melting chamber and melt it into liquid lead.

[0023] Step 3: Auxiliary heating and temperature maintenance. When the lead block begins to melt, the insulation element set in the insulation zone is started to assist in heating and keeping the lead liquid warm.

[0024] The beneficial effects of the present invention are:

[0025] (1) The present invention adopts electromagnetic induction heating technology, which uses an alternating magnetic field to generate an induced current in the ring groove to achieve rapid heating. The heating efficiency is greatly improved compared with traditional resistance wire heating. Under the same heating conditions, it may take several hours to heat a certain amount of lead blocks to the required temperature using traditional heating methods. However, the heating and heat preservation lead pot of the present invention can complete this task in a shorter time, greatly shortening the production cycle, improving production efficiency, and meeting the demand for efficient processing in large-scale industrial production;

[0026] (2) The present invention can significantly improve heating efficiency, heating uniformity and structural stability by providing annular grooves and vertical ribs on the side walls of the heating zone. This design not only optimizes heat conduction and eddy current distribution, but also enhances the mechanical strength of the heating zone, enabling it to better adapt to high-temperature and high-pressure working environments. At the same time, the design of the grooves and ribs also helps to improve energy utilization efficiency, reduce energy waste and extend the service life of the equipment.

[0027] (3) The support assembly in the present invention is installed on the installation base plate through the support feet. The limiting portion composed of the first limiting block and the second limiting block can firmly limit the electromagnetic heating coil to prevent its displacement from affecting the heating effect. At the same time, the baffle is fixedly connected to the melting chamber, and the support column and connecting block between the installation base plate and the baffle are further ensured to ensure the stability of the overall structure of the lead pot and extend the service life of the equipment.

[0028] In summary, the present invention has the advantages of efficient heating, uniform temperature, stable and safe, and convenient operation, and is particularly suitable for the field of lead-acid battery processing and production technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the lead pot of the present invention;

[0030] Figure 2 This is a schematic diagram of the overall top view of the lead pot of the present invention;

[0031] Figure 3 This is a schematic diagram of the three-dimensional structure of the lead pot of the present invention;

[0032] Figure 4 This is a schematic diagram of the combined structure of the heating element and the support assembly of the present invention;

[0033] Figure 5 It is a schematic diagram of the three-dimensional structure of the support assembly and the magnetic flux concentrator of the present invention;

[0034] Figure 6 Schematic diagram of the distribution of magnetic flux lines between the heating element and the ring groove of the present invention.

[0035] In the figure: bracket 1, lead pot 2, insulation zone 21, heating zone 22, annular groove 221, ribs 222, magnetic flux concentrator 223, insulation and heating assembly 3, heating element 31, insulation element 32, support assembly 4, support foot 41, first limit block 42, second limit block 43, limit part 44. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0039] Example 1:

[0040] like Figures 1 to 6 As shown, a heating and heat preservation lead pot comprises a bracket 1, a lead pot 2 and a heat preservation and heating component 3;

[0041] The bracket 1 is frame-shaped and supports the lead pot 2;

[0042] The lead pot 2 is arranged in an upper and lower layered manner. The lead pot 2 includes a heat preservation area 21 located in the upper layer and a heating area 22 located in the lower layer. The heat preservation area 21 keeps the lead liquid warm to prevent it from cooling too quickly. The heating area 22 is arranged in an inverted frustum shape. This shape helps to concentrate heat and improve the efficiency of hot melting. The heating area 22 is used to hot melt the lead block.

[0043] The thermal insulation and heating component 3 performs thermal insulation and heating treatment on the thermal insulation zone 21 and the heating zone 22 respectively. The thermal insulation and heating component 3 includes a heating element 31, which is arranged around the outside of the heating zone 22. The heating element 31 is a magnetic induction heating coil. The magnetic induction heating coil generates eddy currents through electromagnetic induction, thereby generating heat inside the lead block, causing it to melt rapidly. This heating method has the advantages of high efficiency, speed, and strong controllability.

[0044] Furthermore, the wall thickness h of the heating zone 22 and the skin depth δ satisfy the relationship: 3.2δ>h>3δ. The wall thickness of the heating zone 22 is large enough to enable the electromagnetic field to fully penetrate the conductor, thereby generating sufficient eddy current heating effect inside the heating zone 22. The design of the wall thickness h also needs to consider the uniformity of heating. Too thick or too thin walls may cause uneven temperature distribution inside the heating zone 22, affecting the hot melting effect of the lead block. If the wall thickness is too thin h<3δ, the electromagnetic field will penetrate the entire wall thickness and leak to the outside, resulting in reduced heating efficiency. If the wall thickness is too thick h>3.2δ, the electromagnetic field outside the heating zone 22 will not be able to effectively penetrate into the inside, resulting in energy waste and uneven heating. Excessively thick walls will also increase material costs and equipment weight. By controlling the wall thickness h within the range of 3.2δ>h>3δ, it can be ensured that the electromagnetic field is fully distributed inside the heating zone 22, achieving efficient and uniform heating effects.

[0045] Where, skin depth δ = = , ρ is the conductor resistivity, ω is the angular frequency, ω=2πf, f is the current frequency, μ is the conductor magnetic permeability, μ=μ0μ r , μ0 is the vacuum permeability, μ0=4π×10 -7 H / m, μ r is the relative magnetic permeability.

[0046] Furthermore, the sidewalls of the heating zone 22 are provided with a plurality of annular grooves 221 protruding inward. The annular grooves 221 increase the surface area of ​​the sidewalls of the heating zone 22, thereby improving the heat conduction efficiency and distributing the heat more evenly to the lead block or lead liquid. The design of the annular grooves 221 can guide the electromagnetic field to form a more uniform eddy current distribution inside the heating zone 22, thereby avoiding local overheating or insufficient heating. In addition, the annular grooves 221 can, to a certain extent, relieve the stress generated by thermal expansion during the heating process, thereby preventing cracking or deformation of the sidewalls.

[0047] The side wall of the heating zone 22 is provided with ribs 222 protruding inwardly in the vertical direction. The height H of the ribs 222 and the wall thickness h of the heating zone 22 satisfy the relationship: h<H< h, avoid stress concentration or fracture caused by the ribs 222 being too high. The ribs 222 are arranged in the vertical direction, which can significantly enhance the mechanical strength of the side walls of the heating zone 22 and prevent deformation or fracture under high temperature and high pressure environments. During the heating process, the ribs 222 can guide the flow of the lead liquid to avoid the formation of dead zones in the heating zone 22, thereby improving the heating uniformity, and can further increase the surface area of ​​the side walls of the heating zone 22, enhance the heat exchange efficiency, and enable heat to be transferred to the lead block or lead liquid faster. The combined design of the annular groove 221 and the ribs 222 can significantly improve the heating uniformity of the heating zone 22 while jointly enhancing the structural stability of the side walls of the heating zone 22, so that it can withstand the stress caused by high temperature, high pressure and thermal expansion. By increasing the heat exchange area and optimizing the eddy current distribution, the design of the annular groove 221 and the ribs 222 can improve energy utilization efficiency and reduce energy waste.

[0048] It should be noted that the ribs 222 and the annular groove 221 are integrally formed with the lead pot 2 using the same material, and have the same thermal expansion coefficient, thereby avoiding stress concentration and cracking problems caused by temperature changes. The interior of the lead pot 2 is sprayed with a titanium nitride coating to enhance lead corrosion resistance. The ribs 222, the annular groove 221 and the lead pot 2 are integrally cast and formed. The integral casting can eliminate the weak points caused by welding or splicing, and improve the overall mechanical strength and durability of the lead pot 2.

[0049] In addition, a magnetic flux concentrator 223 is provided on the outside of the bottom of the heating zone 22. The magnetic flux concentrator 223 can significantly improve the efficiency, heating uniformity and energy utilization efficiency of magnetic induction heating. It not only optimizes the distribution and penetration effect of the magnetic field, but also reduces energy loss, ensuring that the bottom of the heating zone 22 can heat the lead block or lead liquid evenly and efficiently. The magnetic flux concentrator 223 is a U-shaped silicon steel sheet magnet. The U-shaped silicon steel sheet magnet is on the outside of the bottom of the heating zone 22. The magnetic flux lines generated by the magnetic induction heating coil will preferentially pass through the silicon steel sheet with high magnetic permeability rather than the air, forming a closed magnetic circuit, and concentrating the magnetic field generated by the magnetic induction heating coil to the bottom of the heating zone 22. By concentrating the magnetic field, the U-shaped silicon steel sheet magnet can make the magnetic field distribution at the bottom of the heating zone 22 more uniform, avoiding local overheating or insufficient heating. The U-shaped silicon steel sheet magnet also has good thermal management and mechanical strength, can adapt to high temperature and high pressure working environment, and extend the service life of the equipment.

[0050] It should be noted that, since the magnetic flux concentrator 223 may generate a certain amount of heat under the action of the magnetic field, a small air gap needs to be maintained between the U-shaped silicon steel sheet magnetizer and the outer wall of the lead pot 2 to avoid direct contact with the high-temperature surface and thus causing deformation.

[0051] Furthermore, the outer side of the lead pot 2 is wrapped with a thermal insulation material, which is at least one layer of aluminum foil or ceramic fiber blanket. The thermal insulation material can effectively block the conduction, convection and radiation of heat, reduce the loss of heat inside the lead pot 2 to the external environment, thereby improving heating efficiency and reducing energy consumption. Through thermal insulation, the temperature inside the lead pot 2 can be more stable, avoiding temperature fluctuations caused by heat loss, and ensuring that the lead liquid or lead block is maintained within the required heating or insulation temperature range.

[0052] Furthermore, the heating element 31 is wound with a gradually expanding coil spacing along the depth direction of the heating zone 22, so that the density of turns of the heating element 31 at the top of the heating zone 22 is less than the density of turns of the heating element 31 at the bottom of the heating zone 22. During the heating process of the lead pot 2, the temperature at the bottom of the heating zone 22 usually needs to be higher to quickly melt the solid lead block, while the temperature requirement at the top is relatively low, mainly used for heat preservation. The gradually expanding coil spacing design makes the bottom coil denser, generating a stronger magnetic field and eddy current heating effect, while the top coil is sparser and the magnetic field is weaker, thereby optimizing the temperature distribution. By increasing the turn density at the bottom, more magnetic field energy can be concentrated at the bottom of the heating zone 22, improving heating efficiency while reducing energy waste at the top.

[0053] An air gap is provided between the heating element 31 and the outer wall of the heating zone 22. The presence of the air gap can adjust the magnetic field distribution between the heating element 31 and the heating zone 22, ensuring that the magnetic field can effectively penetrate the heating zone 22 and generate sufficient eddy current heating effect. An appropriate air gap can reduce magnetic field leakage and improve heating efficiency. The air gap can also reduce direct heat conduction between the heating element 31 and the heating zone 22, preventing the heating element 31 from being damaged due to overheating.

[0054] At the same time, the air gap also helps to reduce the temperature of the outer wall of the heating zone 22 and improve the safety of the equipment. The distance h of the air gap and the diameter φ of the heating element 31 satisfy the relationship: 1φ≤h≤2φ. This range is to balance the magnetic field distribution and heating efficiency. If the air gap is too small (h<1φ), the magnetic field may be too concentrated, resulting in uneven heating and increasing the heat load of the heating element 31. If the air gap is too large (h>2φ), the magnetic field will leak too much, reducing the heating efficiency.

[0055] The heating element 31 is installed on the outside of the heating zone 22 through the support assembly 4. The support assembly 4 includes a support foot 41, a first limit block 42 and a second limit block 43. The support foot 41 is installed on the bracket 1. The support foot 41 is made of high-strength and wear-resistant material. The first limit block 42 and the second limit block 43 are both concave. The first limit block 42 and the second limit block 43 are relatively connected. This design can better fit the shape of the electromagnetic heating coil and enhance the stability of the limit. The first limit block There is a limiting portion 44 for accommodating the electromagnetic heating coil between the block 42 and the second limiting block 43. The electromagnetic heating coil is inserted into the limiting portion 44. The first limiting block 42 and the second limiting block 43 limit the electromagnetic heating coil from both sides, effectively preventing it from shifting in the horizontal direction. Moreover, the concave structure can also buffer the vibration generated during the operation of the equipment to a certain extent, avoiding damage to the electromagnetic heating coil due to vibration, ensuring the stable operation of the heating component 2, and thus ensuring that the entire heating system heats the lead block in the melting chamber 11 efficiently and continuously.

[0056] Furthermore, the heating element 31 adopts a copper tube embedded liquid cooling structure. The copper tube has excellent thermal conductivity and can quickly transfer the heat generated by the heating element 31 to the coolant, thereby preventing the heating element 31 from overheating. The coolant temperature is controlled within the range of 30-50°C, which can ensure that the heating element 31 operates at the optimal operating temperature and avoid performance degradation or damage due to overheating. Through the liquid cooling structure, the operating temperature of the heating element 31 is stabilized, thereby ensuring the stability of its resistivity and magnetic induction heating efficiency. The coolant circulation can continuously take away heat, avoiding the heating efficiency of the heating element 31 being reduced due to excessive temperature.

[0057] In addition, the heat preservation and heating component 3 also includes a heat preservation element 32 arranged in the heat preservation zone 21. The heat preservation element 32 is an electric heating wire. The heat preservation element 32 can compensate for the heat loss in the heat preservation zone 21 by continuous heating, ensuring that the lead liquid is maintained within the required temperature range, and the heat preservation element 32 extends downward from the top of the heat preservation zone 21 and is inserted into the bottom of the heat preservation zone 21 to ensure that the heating range covers the entire heat preservation zone 21. This method can avoid temperature stratification of the lead liquid in the heat preservation zone 21. After the electric heating wire is energized, it quickly converts electrical energy into thermal energy. The heat is quickly transferred to the interior of the melting cavity 11 through thermal radiation and thermal convection through the surrounding air. This not only effectively fills the temperature uneven area that may appear in the heating component 2 during the heating process, making the lead block more uniformly heated from top to bottom, but also greatly shortens the melting time of the lead block, significantly improving production efficiency. By flexibly adjusting the power of the electric heating wire, it is possible to achieve fine control of the heating process, meet the special requirements of the lead block heating temperature, speed, etc. in different production scenarios, and further optimize the overall heating performance of the lead pot 2.

[0058] Example 2:

[0059] The present invention also provides a method for using a heating and heat-insulating lead pot according to Example 1, comprising the following steps:

[0060] Step 1: Place the lead block, open the lead pot 2, and place the lead block to be melted into the heating zone 22 of the lead pot 2;

[0061] Step 2: Start the heat-insulating heating assembly 3 and connect the alternating current to the heating element 31. When the heating element 31 is energized, it generates an alternating magnetic field. This alternating magnetic field penetrates the sidewalls of the lead pot 2 and acts on the heating zone 22 of the lead pot 2 and the lead blocks inside. The alternating magnetic field generates an induced electromotive force in the conductor, which in turn generates an induced current in the annular groove 221 and ribs 222 inside the heating zone 22. When the current passes through the annular groove 221 and ribs 222, it generates heat, which begins to heat the lead blocks in the melting chamber 11 and melt them into molten lead.

[0062] Step 3: Auxiliary heating and temperature maintenance. When the lead block begins to melt, the insulation element 32 set in the insulation zone 21 is started to perform auxiliary heating and temperature maintenance on the lead liquid.

[0063] It should be noted that the alternating magnetic field generates eddy currents in the conductor lead block and the side wall of the heating zone 22, and the eddy currents generate heat through the resistance, thereby achieving efficient heating.

[0064] It should be further explained that when electromagnetic induction occurs, the alternating magnetic field generated by the electromagnetic heating coil is distributed and extended to the spaces on both sides of the annular groove 221 with the annular groove 221 as the center.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A heating and heat-insulating lead pot, characterized in that: It comprises a bracket (1), a lead pot (2) and a heat preservation and heating component (3); The bracket (1) is arranged in a frame shape, and the bracket (1) carries and installs the lead pot (2); The lead pot (2) is arranged in an upper and lower layered manner, and comprises a heat preservation zone (21) located in the upper layer and a heating zone (22) located in the lower layer. The heat preservation zone (21) is used to keep the lead liquid warm, and the heating zone (22) is arranged in an inverted frustum shape, and the heating zone (22) is used to heat-smash the lead block. The side wall of the heating zone (22) is protruded inwardly and is provided with a plurality of groups of annular grooves (221), and the side wall of the heating zone (22) is protruded inwardly in the vertical direction and is provided with ribs (222); The wall thickness h of the heating zone (22) and the skin depth δ satisfy the relationship: 3.2δ>h>3δ, wherein the skin depth δ= = , ρ is the ring slot resistivity, ω is the angular frequency, ω=2πf, f is the current frequency, μ is the ring slot magnetic permeability, μ=μ0μ r , μ0 is the vacuum permeability, μ0=4π×10 -7 H / m, μ r is the relative magnetic permeability; The heat preservation and heating component (3) performs heat preservation and heating treatment on the heat preservation zone (21) and the heating zone (22) respectively. The heat preservation and heating component (3) comprises a heating element (31), which is arranged around the outside of the heating zone (22) and is a magnetic induction heating coil. The heating element (31) is wound with a gradually expanding coil spacing along the depth direction of the heating zone (22), and the density of turns of the heating element (31) at the top of the heating zone (22) is smaller than the density of turns of the heating element (31) at the bottom of the heating zone (22).

2. A heating and heat-insulating lead pot according to claim 1, characterized in that: A magnetic flux concentrator (223) is provided on the outer side of the bottom of the heating zone (22), and the magnetic flux concentrator (223) is a U-shaped silicon steel sheet magnetic conductor.

3. The heating and heat-insulating lead pot according to claim 1, characterized in that: The outer side of the lead pot (2) is wrapped with a heat-insulating material, and the heat-insulating material is at least one layer of aluminum foil or ceramic fiber blanket.

4. A heating and heat-insulating lead pot according to claim 1, characterized in that: An air gap is provided between the heating element (31) and the outer side wall of the heating zone (22), and the distance h of the air gap and the diameter φ of the heating element (31) satisfy the relationship: 1φ≤h≤2φ; Furthermore, the heating element (31) is installed on the outside of the heating zone (22) via a support assembly (4).

5. The heating and heat-insulating lead pot according to claim 1, characterized in that: The heating element (31) adopts a copper tube embedded liquid cooling structure, and the cooling liquid temperature is controlled at 30-50°C.

6. The heating and heat-insulating lead pot according to claim 1, characterized in that: The heat preservation heating assembly (3) further includes a heat preservation element (32) disposed in the heat preservation zone (21), wherein the heat preservation element (32) is an electric heating wire, and the heat preservation element (32) extends downward from the top of the heat preservation zone (21) and is inserted into the bottom of the heat preservation zone (21).

7. A method for using a heating and heat-insulating lead pot according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Place the lead block, open the lead pot, and place the lead block to be melted into the heating zone (22) of the lead pot (2); Step 2: Start the heat preservation heating component and connect the alternating current of the heating element (31). When the heating element (31) is energized, an alternating magnetic field is generated. The alternating magnetic field penetrates the side wall of the lead pot (2) and acts on the heating zone (22) of the lead pot (2) and the lead block inside. The alternating magnetic field generates an induced electromotive force in the annular groove (221), and then forms an induced current on the annular groove (221) and the ribs (222) inside the heating zone (22). When the current passes through the annular groove (221) and the ribs (222), heat is generated, and the lead block in the melting chamber (11) begins to be heated and melted into lead liquid. Step 3: Auxiliary heating and temperature maintenance. When the lead block begins to melt, the insulation element (32) provided in the insulation zone (21) is activated to perform auxiliary heating and temperature maintenance on the lead liquid.

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