A self-stable type sagger assembly of a heat treatment roasting device

Abstract

The utility model provides a kind of self-stable formula sagger assembly of heat treatment roasting device belongs to self-stable formula sagger technical field, the self-stable formula sagger assembly of this heat treatment roasting device, including sagger body, support ring and limit boss, sagger body is cylindrical structure, the bottom of sagger body is closed structure, the top of sagger body is open structure, support ring is fixedly connected on the outer circumferential surface of sagger body, the geometric center of support ring and the geometric center of sagger body are located on same vertical axis, limit boss is arranged on the lower surface of support ring, limit boss is evenly distributed along the circumferential direction of support ring, the included angle formed by the lower surface of support ring and the connection of sagger body outer circumferential surface is obtuse angle, when sagger assembly is placed on the bearing platform of roasting device, the bottom end surface of limit boss and bearing platform surface contact, the outer edge diameter of support ring is greater than the outer circumferential diameter of sagger body.

Description

Technical Field

[0001] This utility model belongs to the field of self-stabilizing sagger technology, specifically, it relates to a self-stabilizing sagger assembly of a heat treatment roasting device. Background Technology

[0002] In the production processes of ceramics, powder metallurgy, electronic materials, and new functional materials, heat treatment calcination is a critical technological step. Materials to be calcined need to undergo prolonged heating in a high-temperature furnace to complete physicochemical changes. To protect the materials and prevent contamination from the furnace atmosphere or other materials, they are typically placed in saggers for calcination. Saggers, as the supporting container, need to be heat-resistant, corrosion-resistant, and possess sufficient mechanical strength. Currently, commonly used saggers are mostly simple cylindrical or square containers placed directly on the support plate or bracket of the calcination furnace. These saggers typically rely on their bottom plane contacting the supporting surface for support. Some saggers have simple protrusions or foot pads on the outer side of the bottom. However, these existing structures have limitations in practical application. There are obvious shortcomings in its application. Due to the high and uneven temperature distribution inside the roasting furnace, the sagger will undergo thermal expansion during the heating process. The difference in the degree of expansion in different parts causes the sagger to deform. The simple flat bottom or structure with a few support points cannot provide stable support, making the sagger prone to tilting. This tilting phenomenon is more obvious when there is a lot of material loaded or the material is unevenly distributed. The tilting of the sagger will cause uneven accumulation of material in the container, uneven heating, and a decrease in roasting quality. In severe cases, it may even cause material to overflow or the sagger to overturn. The existing contact method between the sagger and the bearing surface often causes local stress concentration. Under repeated thermal cycling, the contact parts are prone to cracks or wear, which shortens the service life of the sagger and increases the replacement frequency and production cost. Utility Model Content

[0003] In view of this, the present invention provides a self-stabilizing sagger assembly for a heat treatment roasting device, which can solve the technical problems of existing heat treatment roasting devices where saggers are prone to tilting or instability during high-temperature roasting due to unreasonable support structures, resulting in uneven material distribution inside the sagger, affecting roasting quality and product consistency. At the same time, improper contact between the sagger and the supporting platform can cause local stress concentration and thermal damage, shortening the service life of the sagger and roasting device, and increasing production costs and maintenance frequency.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a self-stabilizing sagger assembly for a heat treatment roasting apparatus, used to support and protect the material to be roasted within the apparatus. The assembly includes a sagger body, a support ring, and limiting bosses. The sagger body has a cylindrical structure with a closed bottom and an open top. The support ring is fixedly connected to the outer circumferential surface of the sagger body, and the geometric center of the support ring and the geometric center of the sagger body are located on the same vertical axis. The limiting bosses are disposed on the lower surface of the support ring and are evenly distributed along the circumference of the support ring. The angle formed at the connection between the lower surface of the support ring and the outer circumferential surface of the sagger body is an obtuse angle. When the sagger assembly is placed on the support platform of the roasting apparatus, the bottom end face of the limiting bosses contacts the surface of the support platform. The outer edge diameter of the support ring is larger than the outer circumferential diameter of the sagger body.

[0006] The technical advantages of the self-stabilizing sagger assembly of the heat treatment roasting device provided by this utility model are as follows: By setting a support ring on the outer circumferential surface of the sagger body and setting a limiting boss evenly distributed along the circumferential direction on the lower surface of the support ring, the sagger assembly can form multi-point contact support with the bearing platform through the limiting boss when placed. The obtuse angle structure formed at the connection between the lower surface of the support ring and the outer circumferential surface of the sagger body enhances the connection strength. The design that the outer edge diameter of the support ring is larger than the outer circumferential diameter of the sagger body allows the support ring to provide a larger support area, thereby ensuring that the sagger assembly maintains a stable posture during high-temperature roasting, effectively preventing the sagger from tilting or overturning due to uneven heating or device vibration, and ensuring the continuity of the roasting process and the consistency of product quality.

[0007] Based on the above technical solution, the self-stabilizing sagger assembly of the heat treatment roasting device of this utility model can be further improved as follows:

[0008] Wherein, the width of the limiting boss along the circumferential direction of the support ring is less than the interval between two adjacent limiting bosses.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the width of the limiting boss along the circumference of the support ring is smaller than the spacing between two adjacent limiting bosses. This design allows sufficient space between the limiting bosses, which is conducive to the flow of hot air under the support ring and avoids local heat accumulation caused by the excessive density of the limiting bosses. At the same time, the smaller boss width can reduce the contact area with the bearing platform, reduce the contact stress caused by thermal expansion, extend the service life of the limiting bosses and the bearing platform, and improve the reliability and stability of the sagger assembly under repeated thermal cycling conditions.

[0010] Furthermore, the thickness of the support ring gradually increases from the inside to the outside in the radial direction, and the thickness at the outer edge of the support ring is greater than the thickness at the inner edge of the support ring.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the structural design of the support ring with the thickness gradually increasing from the inside to the outside in the radial direction allows the support ring to distribute the load more evenly to the limiting boss when bearing the weight of the sagger body and the material. The larger thickness at the outer edge provides stronger bending stiffness and effectively resists the deformation tendency caused by material softening under high temperature environment. The smaller thickness at the inner edge reduces the thermal stress concentration at the connection with the sagger body. This gradually thickened structure not only ensures the load-bearing capacity of the support ring, but also optimizes the material distribution, reduces the overall weight, and improves the thermal stability of the sagger assembly.

[0012] Furthermore, the inner wall of the sagger body has a smooth cylindrical structure, and the radius of the transition fillet formed at the connection between the inner surface of the bottom of the sagger body and the inner wall is greater than 1 / 2 of the wall thickness of the sagger body.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the inner wall of the sagger body has a smooth cylindrical structure and the radius of the transition fillet formed at the connection between the bottom inner surface and the inner wall is greater than 1 / 2 of the wall thickness of the sagger body. This design eliminates the sharp inner corner structure, avoids the generation of stress concentration points, the smooth inner wall surface facilitates the filling of materials to be roasted and the removal of finished products after roasting, the larger transition fillet buffers the thermal stress generated by the materials during roasting, reduces the risk of the sagger body cracking due to thermal shock, and the smooth surface also facilitates the cleaning and maintenance of the sagger after use, extending the service life of the sagger body.

[0014] Furthermore, the limiting boss has a trapezoidal protrusion structure, and the bottom area of ​​the limiting boss is smaller than the connection area between the limiting boss and the lower surface of the support ring.

[0015] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the limiting boss has a trapezoidal protrusion structure and the bottom area is smaller than the connection area with the lower surface of the support ring. This trapezoidal structure with a larger top and a smaller bottom gives the limiting boss good shear resistance, which can resist the horizontal displacement generated by the sagger assembly during the operation of the firing device. The smaller bottom contact area reduces the frictional resistance between it and the bearing platform, which facilitates the adjustment of the small displacement of the sagger assembly caused by thermal expansion. The larger connection area enhances the connection strength between the limiting boss and the support ring, preventing the limiting boss from falling off or breaking from the support ring under high temperature and load.

[0016] Furthermore, the support ring has an annular plate structure in a cross section perpendicular to the axis of the sagger body, and the upper surface of the support ring is connected to the outer circumferential surface of the sagger body by welding.

[0017] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the support ring has an annular plate structure on the cross section perpendicular to the axis of the sagger body and is connected to the outer circumferential surface of the sagger body by welding. The annular plate structure provides uniform circumferential stiffness, which can effectively resist the radial deformation of the sagger body under high temperature environment. The welding connection method ensures that a strong integrated structure is formed between the support ring and the sagger body, avoiding the loosening or failure problems that may exist in mechanical connection methods. This connection method also eliminates the relative displacement caused by temperature difference, ensuring the structural integrity and stability of the sagger assembly throughout the entire firing cycle.

[0018] Furthermore, the open edge of the sagger body is folded outward to form a flange structure, and the outer edge diameter of the flange structure is smaller than the outer edge diameter of the support ring.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the flange structure formed by folding the edge of the open end of the sagger body outward and the outer edge diameter being smaller than the outer edge diameter of the support ring enhances the rigidity of the open end of the sagger body, preventing deformation or damage to the open end during loading and unloading of materials. The design that the outer edge diameter of the flange is smaller than the outer edge diameter of the support ring ensures that when multiple sagger components are stacked vertically, the support ring of the upper sagger can be stably supported on the flange structure of the lower sagger, forming a reliable stacking connection. This design facilitates the batch storage and transportation of sagger components and ensures the stability between each sagger component in the stacked state.

[0020] Furthermore, the number of limiting protrusions is 3 to 6, and the geometric center of the polygon formed by connecting the centers of each limiting protrusion along the circumferential direction of the support ring coincides with the geometric center of the support ring.

[0021] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the number of limiting bosses is 3 to 6, and the geometric center of the polygon formed by the line connecting the centers of each limiting boss along the circumference of the support ring coincides with the geometric center of the support ring. This symmetrical arrangement allows the center of gravity of the sagger assembly to be evenly distributed on each limiting boss, forming a stable multi-point support system. The design of 3 to 6 limiting bosses not only ensures sufficient support stability, but also avoids the increased processing complexity and uneven distribution of thermal stress caused by too many limiting bosses. The design of the coincident geometric center ensures that the sagger assembly can maintain the same stability performance at any rotation angle, improving the convenience of use.

[0022] Furthermore, the sagger body is made of refractory ceramic material, and the support ring is made of high-temperature alloy steel material.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the sagger body is made of refractory ceramic material and the support ring is made of high-temperature alloy steel material. Refractory ceramic material has excellent high-temperature resistance and chemical stability, and can withstand high-temperature environment during the firing process without contaminating the material to be fired. High-temperature alloy steel material has good strength and toughness, and can provide reliable support for the sagger body. The reasonable combination of the two materials not only gives full play to their respective performance advantages, but also achieves reliable connection through welding process. This material combination scheme ensures the overall performance of the sagger assembly while also taking into account the reasonableness of manufacturing cost.

[0024] Furthermore, the angle between the lower surface of the support ring and the horizontal plane is less than 5° when the sagger assembly is stationary, and the angle between the side wall of the limiting boss and the lower surface of the support ring is a right angle.

[0025] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the angle between the lower surface of the support ring and the horizontal plane is less than 5° when the sagger assembly is in a static state, and the side wall of the limiting boss forms a right angle with the lower surface of the support ring. The near-horizontal design of the lower surface of the support ring ensures the overall levelness of the sagger assembly after placement, avoiding uneven material distribution in the sagger due to the tilt of the support ring. The right-angle structure formed by the side wall of the limiting boss and the lower surface of the support ring allows the limiting boss to vertically bear the weight of the sagger and the material, avoiding stress concentration at the root of the limiting boss due to lateral force. This precise angle control improves the self-stability of the sagger assembly, ensures uniform heating of the material during the roasting process, and improves the roasting quality.

[0026] Compared with existing technologies, the self-stabilizing sagger assembly of the heat treatment roasting device provided by this utility model has the following advantages: This utility model constructs a stable multi-point support system by setting a support ring on the outer circumference of the sagger body and configuring multiple circumferentially distributed limiting bosses on the lower surface of the support ring. The design of the outer edge diameter of the support ring being larger than the outer diameter of the sagger body expands the support base area. Combined with the trapezoidal structure and optimized spacing of the limiting bosses, the sagger assembly can maintain a stable horizontal posture under high-temperature roasting conditions, effectively preventing tilting and displacement caused by device vibration or uneven thermal expansion. The support ring adopts a gradually varying thickness design and annular plate structure, evenly transferring the weight of the sagger and materials to each limiting boss. The protrusions prevent stress concentration. The smooth cylindrical surface and large rounded corner transition structure inside the sagger body reduce the concentration points of thermal and mechanical stress, improving thermal shock resistance. The combination of refractory ceramics and high-temperature alloy steel ensures both high-temperature performance and sufficient mechanical strength. The near-horizontal lower surface of the support ring and the vertical setting of the limiting protrusions ensure precise levelness control, making the material heat evenly inside the sagger. The overall design significantly improves the stability and reliability of the roasting process, extends the service life of the sagger and roasting device, reduces production costs, and ensures the consistency of roasted product quality. Compared with existing technologies, it represents a significant improvement with simple and reasonable structure, excellent stability, wide applicability, and good economy. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a self-stabilizing sagger assembly of a heat treatment roasting apparatus.

[0029] Figure 2 A cross-sectional view of a self-stabilizing sagger assembly of a heat treatment roasting apparatus;

[0030] Figure 3 A bottom view of a self-stabilizing sagger assembly of a heat treatment roasting apparatus;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 1. Sagger body; 2. Support ring; 3. Limiting boss. Detailed Implementation

[0033] 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.

[0034] like Figures 1-3 The diagram shows a first embodiment of a self-stabilizing sagger assembly for a heat treatment roasting apparatus provided by this utility model. In this embodiment, it is used to support and protect the material to be roasted within the heat treatment roasting apparatus. It includes a sagger body 1, a support ring 2, and a limiting boss 3. The sagger body has a cylindrical structure, with a closed bottom and an open top. The support ring is fixedly connected to the outer circumferential surface of the sagger body. The geometric center of the support ring and the geometric center of the sagger body are located on the same vertical axis. The limiting boss is disposed on the lower surface of the support ring and is evenly distributed along the circumferential direction of the support ring. The angle formed at the connection between the lower surface of the support ring and the outer circumferential surface of the sagger body is an obtuse angle. When the sagger assembly is placed on the support platform of the roasting apparatus, the bottom end face of the limiting boss contacts the surface of the support platform. The outer edge diameter of the support ring is larger than the outer circumferential diameter of the sagger body.

[0035] In the above technical solution, the width of the limiting boss along the circumferential direction of the support ring is less than the interval between two adjacent limiting bosses.

[0036] Furthermore, in the above technical solution, the thickness of the support ring gradually increases from the inside to the outside in the radial direction, and the thickness at the outer edge of the support ring is greater than the thickness at the inner edge of the support ring.

[0037] Furthermore, in the above technical solution, the inner wall surface of the sagger body has a smooth cylindrical structure, and the radius of the transition fillet formed at the connection between the inner surface of the bottom of the sagger body and the inner wall surface is greater than 1 / 2 of the wall thickness of the sagger body.

[0038] Furthermore, in the above technical solution, the limiting boss has a trapezoidal protrusion structure, and the bottom area of ​​the limiting boss is smaller than the connection area between the limiting boss and the lower surface of the support ring.

[0039] Furthermore, in the above technical solution, the support ring has an annular plate structure on the cross section perpendicular to the axis of the sagger body, and the upper surface of the support ring is connected to the outer circumferential surface of the sagger body by welding.

[0040] Furthermore, in the above technical solution, the edge of the open end of the sagger body is folded outward to form a flange structure, and the outer edge diameter of the flange structure is smaller than the outer edge diameter of the support ring.

[0041] Furthermore, in the above technical solution, the number of limiting bosses is 3 to 6, and the geometric center of the polygon formed by connecting the centers of each limiting boss along the circumferential direction of the support ring coincides with the geometric center of the support ring.

[0042] Furthermore, in the above technical solution, the sagger body is made of refractory ceramic material, and the support ring is made of high-temperature alloy steel material.

[0043] Furthermore, in the above technical solution, the angle between the lower surface of the support ring and the horizontal plane is less than 5° when the sagger assembly is in a static state, and the angle between the side wall of the limiting boss and the lower surface of the support ring is a right angle.

[0044] The following is a specific embodiment 1 of this utility model. This embodiment provides a self-stabilizing sagger assembly for firing ceramic products. The sagger body is made of high-purity alumina ceramic material with an alumina content of 95%, and has a cylindrical structure. The outer circumference diameter of the sagger body is 180mm, the inner circumference diameter is 160mm, the wall thickness is 10mm, and the height is 250mm. The bottom of the sagger body is a completely closed circular flat plate structure with a bottom plate thickness of 12mm. The top of the sagger body is an open structure, and the edge of the open end is folded outward to form a flange with a width of 8mm. The flange is clamped to the axis of the sagger body. The angle is 85°, the outer edge diameter of the flange is 196mm, the inner wall of the sagger body is machined into a smooth cylindrical surface, and the surface roughness is controlled within Ra1.6. A transition fillet with a radius of 6mm is set at the connection between the inner wall and the bottom inner surface. The support ring is made of 310S stainless steel high-temperature alloy material and has a ring-shaped plate structure. The inner diameter of the support ring is 182mm, the outer diameter is 240mm, and the thickness of the support ring gradually changes in the radial direction, with a thickness of 4mm at the inner edge and 8mm at the outer edge. The gradual transition adopts a linear change method. The support ring is fixed by argon arc welding. The support ring is fixed to the outer circumferential surface of the sagger body, with the welding position 70mm from the bottom of the sagger body. The angle formed by the connection between the lower surface of the support ring and the outer circumferential surface of the sagger body is 105°. The geometric center of the support ring and the geometric center of the sagger body are located on the same vertical axis. Four limiting bosses are provided, made of the same 310S stainless steel as the support ring, and fixed to the lower surface of the support ring by welding. The four limiting bosses are evenly distributed along the circumference of the support ring, with a central angle interval of 90° between adjacent limiting bosses. The line connecting the centers of all limiting bosses forms a square, and the geometric center of the square is perpendicular to the support ring. The geometric centers coincide, and each limiting boss has a trapezoidal protrusion structure. The connection surface between the limiting boss and the lower surface of the support ring is circular with a diameter of 25mm. The height of the limiting boss is 15mm, and the bottom contact surface is circular with a diameter of 18mm. The side wall of the limiting boss forms a 90° right angle with the lower surface of the support ring. The width of the limiting boss along the circumference of the support ring is 22mm, and the circumferential spacing between two adjacent limiting bosses is 165mm. When the lower surface of the support ring is in the static state of the sagger assembly, the angle between it and the horizontal plane is less than 3°. The total height of the entire sagger assembly is 265mm, and the unloaded weight is 3.With a maximum load capacity of 12kg, the sagger assembly is designed to hold 8kg of ceramic blanks to be fired. The loading height is controlled within 180mm. The sagger assembly is then placed on the alumina ceramic support plate of the firing furnace. Four limiting bosses simultaneously contact the support plate to provide stable support. The firing temperature is set at 1350℃, and the holding time is 4 hours. Throughout the firing process, the sagger assembly maintains a horizontal position through a self-stabilizing structure formed by the support rings and limiting bosses. The gradually varying thickness of the support rings ensures sufficient rigidity even at high temperatures. The spacing between the limiting bosses allows for thermal expansion. Free airflow ensures uniform heating of the material within the sagger. The smooth inner wall and rounded corners of the sagger effectively disperse thermal stress, preventing cracking caused by stress concentration. The 240mm diameter of the support ring, larger than the 180mm outer diameter of the sagger body, provides a stable support base. Even with slight vibrations or uneven thermal expansion during firing, the sagger assembly remains stable and does not tilt. After firing, the ceramic products inside the sagger are uniformly heated, exhibiting good quality consistency. The sagger assembly itself shows no deformation or damage, and its service life can reach over 200 firing cycles.

[0045] The following is another specific embodiment 2 of this utility model. Embodiment 2 is based on Embodiment 1, but the number of limiting bosses is increased to 6. The 6 limiting bosses are evenly distributed along the circumference of the support ring, with a central angle interval of 60° between adjacent limiting bosses. The center line connecting the centers of all limiting bosses forms a regular hexagon, the geometric center of which coincides with the geometric center of the support ring. The diameter of the connection surface between each limiting boss and the lower surface of the support ring is adjusted to 20mm, the height of the limiting boss remains unchanged at 15mm, the diameter of the bottom contact surface is adjusted to 14mm, and the width of the limiting boss along the circumference of the support ring is adjusted to 1... The circumferential spacing between two adjacent limiting bosses is adjusted to 107mm, and the outer diameter of the support ring is enlarged to 260mm to accommodate the arrangement of six limiting bosses. Other structural parameters remain consistent with those in Example 1. This six-point support design further improves the stability of the sagger assembly and is particularly suitable for conditions where the loaded material is heavy or the vibration during the firing process is significant. The six support points can distribute the load more evenly, reduce the force on a single limiting boss, and extend the service life of the limiting bosses and the bearing platform. It is suitable for firing processes of precision ceramics or electronic materials that require higher stability.

[0046] The following is another specific embodiment 3 of this utility model. Embodiment 3 is based on Embodiment 1, but adds three evenly distributed positioning protrusions to the upper surface of the support ring. The central angles of the positioning protrusions along the circumference of the support ring are spaced at 120° intervals. Each positioning protrusion has a semi-cylindrical structure, arranged radially, with a diameter of 10mm and a length of 30mm. The geometric center of the positioning protrusion is located 15mm inward from the outer edge of the upper surface of the support ring. The top of the positioning protrusion protrudes 6mm above the upper surface of the support ring. The positioning protrusions are fixed by welding using the same 310S stainless steel material as the support ring. This design allows the support ring of the upper sagger to be positioned when multiple sagger assemblies are stacked vertically. Its lower surface forms a stable contact with the flange structure of the lower sagger, while the outer circumferential surface of the bottom of the upper sagger can form a limiting fit with the positioning protrusion of the lower sagger to prevent the upper sagger from sliding horizontally in the stacked state. The semi-cylindrical structure of the positioning protrusion provides two line contact points, which, together with the surface contact between the support ring and the flange, form a stable stacking connection. This improvement is particularly suitable for production processes that require batch roasting and adopt multi-layer loading. While ensuring the stability of individual sagger components, it also ensures the reliability of the overall structure in the stacked state. The spacing between the positioning protrusions also makes it easy to observe the state of the material in the lower sagger in the stacked state, improving the monitorability and safety of the production process.

[0047] Specifically, the principle of this utility model is as follows: A stable, self-stabilizing support system is constructed by fixing a support ring to the outer circumferential surface of the sagger body and setting multiple locating bosses evenly distributed along the circumferential direction on the lower surface of the support ring. The outer edge diameter of the support ring is larger than the outer diameter of the sagger body, forming an outwardly expanding support base. This structure increases the support area and reduces the ratio of the sagger assembly's center of gravity height to the support base, thus improving the system's stability from a mechanical perspective. The locating bosses are evenly distributed along the circumference, forming multi-point support. The geometric center of the polygon formed by connecting the centers of each support point coincides with the geometric center of the sagger, ensuring uniform load distribution and symmetry, and avoiding excessive force on one side. The locating bosses adopt a trapezoidal protrusion structure, with the bottom area smaller than the connection area with the support ring. This top-large, bottom-small structure has good stability when bearing vertical loads. Simultaneously, the smaller bottom contact area reduces the contact stress with the bearing platform. The support ring adopts a design with a thickness that gradually changes radially. The design incorporates a thicker outer side to provide sufficient bending strength, and a thinner inner side to reduce thermal stress at the connection with the sagger body. The lower surface of the support ring forms an obtuse angle at the connection with the outer surface of the sagger body, enhancing welding strength and avoiding sharp stress concentration points. The sagger body's interior features a smooth cylindrical surface and large rounded corner transition structure, eliminating stress concentration sources and improving thermal shock resistance. During high-temperature firing, even if the sagger body and support ring undergo minor deformation due to thermal expansion, the annular plate structure of the support ring provides good circumferential stiffness, constraining the radial deformation of the sagger body. The multi-point support of the limiting boss ensures the sagger assembly maintains a stable horizontal posture. The small angular deviation between the lower surface of the support ring and the horizontal plane, along with the vertical setting of the limiting boss's sidewall, further guarantees precise horizontality. Through reasonable geometric design and material selection, the entire self-stabilizing structure achieves long-term stable support in high-temperature environments, effectively solving the technical problems of existing saggers being prone to tilting instability and stress concentration damage.

[0048] The specific operation or use method of this utility model is as follows: Before use, first check whether the support ring and limiting boss of the sagger assembly are intact and undamaged. Confirm that each limiting boss is evenly distributed along the circumference and has no cracks or deformation. Fill the sagger body with the material to be roasted according to the process requirements. The material filling amount should not exceed 3 / 4 of the height of the sagger body to leave enough expansion space. When filling, pay attention to the even distribution of the material in the sagger to avoid excessive material on one side causing the center of gravity to shift. After filling, place the sagger assembly stably on the bearing platform in the roasting furnace. When placing, ensure that each limiting boss is in contact with the surface of the bearing platform at the same time to ensure that the sagger assembly is in a horizontal state. The horizontality is judged by observing whether the gap between the outer edge of the support ring and the bearing platform is uniform. When placing multiple sagger assemblies, an appropriate distance should be maintained to ensure that the hot airflow can flow freely between the saggers. Set the furnace temperature and holding time according to the roasting process requirements, and start the furnace. In the active roasting process, during the heating process, the sagger assembly maintains a horizontal posture through the stable support of the support ring and the limiting boss. The gap between the limiting bosses allows hot air to pass through, achieving uniform heating. During the roasting process, the slight displacement of the sagger assembly caused by thermal expansion is constrained by the trapezoidal structure of the limiting boss, preventing large displacement or tilting. During the heat preservation stage, the material is uniformly heated in the sagger to complete the roasting reaction. After roasting, the temperature is lowered according to the process requirements. After the furnace temperature drops to a safe level, the furnace door is opened, and the sagger assembly is removed from the support platform using special tools. When removing it, note that the sagger may still be hot and protective measures should be taken. The sagger assembly is placed on a heat-resistant workbench to cool to room temperature. Then, the roasted material is removed from the sagger body. After use, the sagger assembly is cleaned and inspected to remove residual material and impurities. The support ring and the limiting boss are checked for damage. After confirming that they are intact, they can be used again.

Claims

1. A self-stabilizing sagger assembly for a heat treatment roasting apparatus, used to support and protect the material to be roasted within the heat treatment roasting apparatus, comprising a sagger body, a support ring, and limiting bosses, wherein the sagger body has a cylindrical structure, the bottom of the sagger body is a closed structure, and the top of the sagger body is an open structure, the support ring is fixedly connected to the outer circumferential surface of the sagger body, the geometric center of the support ring and the geometric center of the sagger body are located on the same vertical axis, and the limiting bosses are disposed on the lower surface of the support ring, the limiting bosses being evenly distributed along the circumferential direction of the support ring, characterized in that... The angle formed at the connection between the lower surface of the support ring and the outer circumferential surface of the sagger body is an obtuse angle. When the sagger assembly is placed on the support platform of the firing device, the bottom end face of the limiting boss contacts the surface of the support platform, and the outer edge diameter of the support ring is larger than the outer circumferential diameter of the sagger body.

2. The self-stabilizing sagger assembly of a heat treatment roasting apparatus according to claim 1, characterized in that, The width of the limiting boss along the circumference of the support ring is less than the distance between two adjacent limiting bosses.

3. The self-stabilizing sagger assembly of a heat treatment roasting apparatus according to claim 2, characterized in that, The thickness of the support ring gradually increases from the inside to the outside in the radial direction, and the thickness at the outer edge of the support ring is greater than the thickness at the inner edge of the support ring.

4. The self-stabilizing sagger assembly of a heat treatment roasting apparatus according to claim 3, characterized in that, The inner wall of the sagger body has a smooth cylindrical structure, and the radius of the transition fillet formed at the junction of the inner surface of the bottom of the sagger body and the inner wall is greater than 1 / 2 of the wall thickness of the sagger body.

5. The self-stabilizing sagger assembly of a heat treatment roasting apparatus according to claim 4, characterized in that, The limiting boss has a trapezoidal protrusion structure, and the bottom area of ​​the limiting boss is smaller than the connection area between the limiting boss and the lower surface of the support ring.

6. The self-stabilizing sagger assembly of a heat treatment roasting apparatus according to claim 5, characterized in that, The support ring has an annular plate structure in a cross section perpendicular to the axis of the sagger body, and the upper surface of the support ring is connected to the outer circumferential surface of the sagger body by welding.

7. The self-stabilizing sagger assembly of a heat treatment roasting apparatus according to claim 6, characterized in that, The edge of the open end of the sagger body is folded outward to form a flange structure, and the outer edge diameter of the flange structure is smaller than the outer edge diameter of the support ring.

8. The self-stabilizing sagger assembly of a heat treatment roasting apparatus according to claim 7, characterized in that, The number of limiting protrusions is 3 to 6, and the geometric center of the polygon formed by connecting the centers of each limiting protrusion along the circumference of the support ring coincides with the geometric center of the support ring.

9. The self-stabilizing sagger assembly of a heat treatment roasting apparatus according to claim 8, characterized in that, The sagger body is made of refractory ceramic material, and the support ring is made of high-temperature alloy steel material.

10. The self-stabilizing sagger assembly of a heat treatment roasting apparatus according to claim 9, characterized in that, The angle between the lower surface of the support ring and the horizontal plane is less than 5° when the sagger assembly is in a static state, and the angle between the side wall of the limiting boss and the lower surface of the support ring is a right angle.

Images