A gradient holding layer assembly of a heat treatment holding control device

Abstract

The utility model provides a gradient heat preservation layer subassembly of heat treatment heat preservation control device belongs to heat preservation layer subassembly technical field, this gradient heat preservation layer subassembly of heat treatment heat preservation control device includes heat preservation cylinder, gradient adjustment ring, fixed pressing plate and guide groove body, heat preservation cylinder is cylindrical structure, the inner wall of heat preservation cylinder is provided with a plurality of annular grooves along the axial direction, gradient adjustment ring is embedded in annular groove, the inner circumference of gradient adjustment ring extends to the center axis direction of heat preservation cylinder and forms a few radial boss of uniform distribution, fixed pressing plate is connected through bolt in the end of heat preservation cylinder, the central position of fixed pressing plate is provided with through -hole, and guide groove body passes through through -hole and arranges along the axial direction of heat preservation cylinder, the outer surface of guide groove body is provided with a plurality of guide grooves along the axial direction, has solved the problem that the heat preservation layer of existing heat treatment heat preservation device cannot be designed in gradient, the thickness and position adjustment are difficult, lead to material waste, the problem of uneven heat preservation and poor precision control.

Description

Technical Field

[0001] This utility model belongs to the technical field of thermal insulation layer components, and more specifically, relates to a gradient thermal insulation layer component of a heat treatment thermal insulation control device. Background Technology

[0002] In the machinery manufacturing, materials processing, and heat treatment industries, heat treatment insulation control devices are widely used in heat treatment processes such as annealing, normalizing, quenching, and tempering of metal parts. The insulation layer, as a key component of the heat treatment device, directly affects temperature control accuracy and energy consumption. Existing heat treatment insulation devices mostly use single or multiple layers of insulation material of uniform thickness to cover the outside of the heating furnace or treatment cylinder. This structural design ignores the radial temperature gradient during heat transfer; the inner layer near the heat source has a high temperature, while the outer layer away from the heat source has a low temperature. Using a uniformly thick insulation layer cannot provide optimal insulation for different temperature zones. In practical applications, it has been found that excessive inner insulation material is often used, leading to waste, while insufficient outer insulation results in heat loss. Current technologies typically address this problem by increasing the total thickness of the insulation layer. However, this method not only increases material costs and equipment size but also increases thermal inertia due to excessive insulation layer thickness, affecting the response speed of temperature regulation. In addition, existing insulation layers are mostly fixed by simple wrapping or filling methods, lacking effective position adjustment and locking mechanisms. During thermal expansion, vibration and long-term use, the insulation material is prone to sinking, displacement or loosening, resulting in a decrease in insulation effect and affecting the stability of heat treatment process and product quality. Utility Model Content

[0003] In view of this, the present invention provides a gradient insulation layer component for a heat treatment insulation control device, which solves the problems of existing heat treatment insulation devices having no gradient design for the insulation layer, difficulty in adjusting the thickness and position, resulting in material waste, uneven insulation and poor precision control.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a gradient insulation layer assembly for a heat treatment insulation control device, including an insulation cylinder, a gradient adjustment ring, a fixing plate, and a guide groove. The insulation cylinder has a cylindrical structure, wherein the inner wall of the insulation cylinder is provided with multiple annular grooves along the axial direction, the gradient adjustment ring is embedded in the annular groove, the outer circumferential surface of the gradient adjustment ring is in contact with the inner wall surface of the annular groove, and the inner circumferential surface of the gradient adjustment ring extends towards the central axis of the insulation cylinder to form several evenly distributed radial bosses. The fixing plate is bolted to the end of the insulation cylinder, and a through hole is provided at the center of the fixing plate. The guide groove passes through the through hole and is arranged along the axial direction of the insulation cylinder. The outer surface of the guide groove is provided with several guide grooves along the axial direction, and the inner end face of the radial bosses is in contact with the groove wall of the guide groove.

[0006] The technical effects of the gradient insulation layer assembly of the heat treatment insulation control device provided by this utility model are as follows: By setting multiple annular grooves on the inner wall of the insulation cylinder and cooperating with the embedded structure of the gradient adjustment ring, each insulation layer can be stably fixed at different radial positions. At the same time, the radial boss formed by the extension of the inner circumference of the gradient adjustment ring cooperates with the guide groove of the guide groove, realizing the precise positioning and axial guidance of the insulation layer, ensuring that the insulation material of each layer will not be displaced or misaligned during the heat treatment process. The fixing plate is connected to the end of the insulation cylinder by bolts and cooperates with the structure of the guide groove passing through the central through hole to form a complete axial constraint system, ensuring the structural stability and reliability of the insulation effect of the entire gradient insulation layer assembly.

[0007] Based on the above technical solution, the gradient insulation layer assembly of the heat treatment insulation control device of this utility model can be further improved as follows:

[0008] The thickness of the gradient adjustment ring along the axial direction of the insulation cylinder increases from the end closer to the fixed pressure plate to the end farther away from the fixed pressure plate.

[0009] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The structural design of the gradient adjustment ring with increasing thickness along the axial direction makes the insulation layer thinner near the heat source end and thicker away from the heat source end, forming an insulation gradient that gradually strengthens from the inside to the outside. This thickness variation can rationally distribute the insulation material according to the attenuation law of heat transfer, avoiding waste of insulation material, while ensuring the uniformity of the overall insulation effect, so that the temperature forms a gentle gradient distribution in the radial direction, effectively improving the temperature control accuracy and energy utilization efficiency in the heat treatment process.

[0010] Furthermore, the depth of the annular groove increases from the end closer to the fixed pressure plate to the end farther away from the fixed pressure plate, and the distance between two adjacent annular grooves gradually increases along the axial direction.

[0011] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the increasing groove depth of the annular groove, combined with the gradually increasing spacing between adjacent grooves, works synergistically with the increasing thickness of the gradient adjustment ring, so that each insulation layer forms a reasonable gradient distribution in both the radial and axial directions. This bidirectional gradient structure can better adapt to the three-dimensional heat propagation characteristics in space. The change in groove depth ensures that gradient adjustment rings of different thicknesses can be firmly embedded in the corresponding grooves, while the increase in spacing provides sufficient installation space for thicker insulation layers, avoiding mutual compression and interference between adjacent insulation layers.

[0012] Furthermore, the radial bosses have a fan-shaped cross-section structure, and the radial bosses are evenly distributed along the circumference of the insulation cylinder, forming a fan-shaped cavity between two adjacent radial bosses.

[0013] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The radial boss adopts a fan-shaped cross-section structure and is evenly distributed along the circumference. While ensuring effective contact with the guide groove, the fan-shaped cavity formed between adjacent bosses provides a channel for the flow of hot air. This structure not only achieves stable support and precise positioning of the gradient adjustment ring, but also avoids the problem of thermal stress concentration that may be caused by a completely closed structure. The existence of the fan-shaped cavity allows heat to be distributed more evenly in the circumference, reducing the occurrence of local overheating or overcooling. At the same time, the fan-shaped structure can also reduce the overall weight of the gradient adjustment ring, making it easier to install and maintain.

[0014] Furthermore, the cross-section of the guide groove is polygonal, the guide grooves are spirally distributed along the axial direction of the guide groove, and the bottom width of the guide groove is smaller than the opening width.

[0015] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The guide groove adopts a structure with a polygonal cross-section and a spiral guide groove, which enables the radial boss to obtain stable support and accurate guidance when sliding along the guide groove. The polygonal cross-section increases the contact area and improves the load-bearing capacity. The spirally distributed guide groove provides the possibility of rotational adjustment for the gradient adjustment ring. By rotating, the relative position of each insulation layer can be finely adjusted. The trapezoidal groove design with the bottom width being smaller than the opening width allows the radial boss to wedge into the groove to form a self-locking effect, preventing loosening under thermal expansion and improving the overall stability of the component.

[0016] Furthermore, the fixed pressure plate has an annular disc structure, the outer diameter of the fixed pressure plate is equal to the outer diameter of the insulation cylinder, and the thickness of the fixed pressure plate gradually decreases from the outer edge to the center in the radial direction.

[0017] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The fixed pressure plate adopts an annular disc structure with an outer diameter equal to that of the insulation cylinder, ensuring complete closure of the end and overall structural coordination. The thickness gradually decreases radially from the outer edge to the center, giving the fixed pressure plate good flexibility at the center position, which can adapt to the axial displacement of the guide groove caused by thermal expansion. The thicker outer edge provides sufficient rigidity to withstand the clamping force generated by the bolt connection. This thickness gradient distribution not only ensures the sealing effect but also avoids stress concentration caused by excessive rigidity, thus extending the service life of the fixed pressure plate.

[0018] Furthermore, multiple longitudinal reinforcing ribs are formed on the inner wall surface of the insulation cylinder along the axial direction. The height of the longitudinal reinforcing ribs is less than the groove depth of the annular groove, and the longitudinal reinforcing ribs are connected to the groove wall of the adjacent annular groove.

[0019] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The structure of setting longitudinal reinforcing ribs along the axial direction on the inner wall of the insulation cylinder significantly improves the deformation resistance and overall rigidity of the insulation cylinder. The design that the height of the longitudinal reinforcing ribs is less than the depth of the annular groove ensures that the reinforcing ribs will not interfere with the normal embedding and operation of the gradient adjustment ring. At the same time, the connection between the longitudinal reinforcing ribs and the groove wall of the annular groove forms a grid-like reinforcing structure. This structure can effectively resist radial and axial deformation caused by temperature changes during heat treatment, maintain the shape stability of each annular groove, ensure that the gradient adjustment ring is always in the correct position, and maintain the design function of the gradient insulation layer.

[0020] Furthermore, the inner end face of the radial boss has an arc-shaped concave structure, and the radius of curvature of the arc-shaped concave structure matches the radius of curvature of the bottom of the guide groove, thus forming a sliding fit between the radial boss and the guide groove.

[0021] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The inner end face of the radial boss adopts an arc-shaped concave structure and is designed to match the radius of curvature of the bottom of the guide groove, so that a large area of ​​curved surface contact is formed between the two. Compared with line contact or point contact, this curved surface contact significantly reduces contact stress and wear. At the same time, the arc-shaped contact surface also has an automatic centering function, which can compensate for installation errors and thermal deformation. The establishment of the sliding fit relationship allows the gradient adjustment ring to be smoothly adjusted axially or rotated on the guide groove. The adjustment process is smooth and the positioning is accurate, which facilitates quick adjustment and replacement under different insulation requirements.

[0022] Furthermore, the insulation cylinder is made of stainless steel, and the gradient adjustment ring is made of ceramic fiber.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The insulation cylinder is made of stainless steel, which utilizes the excellent high temperature resistance, oxidation resistance and mechanical strength of stainless steel. It can work stably for a long time in high temperature heat treatment environment without deformation or corrosion. The gradient adjustment ring is made of ceramic fiber material, which fully utilizes the excellent thermal insulation performance and low thermal conductivity of ceramic fiber material. Ceramic fiber material is lightweight, high temperature resistant and chemically stable. When used in conjunction with the stainless steel cylinder, it not only ensures structural strength but also achieves efficient thermal insulation. The reasonable combination of the two materials makes the entire component meet functional requirements while having a long service life and good economic efficiency.

[0024] Furthermore, a sealing gasket is provided between the fixed pressure plate and the insulation cylinder. The sealing gasket has an annular structure, and its inner diameter is larger than the diameter of the central through hole of the fixed pressure plate. The sealing gasket is made of high-temperature resistant rubber material.

[0025] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The annular sealing gasket between the fixed pressure plate and the insulation cylinder effectively prevents hot air leakage from the end gaps, improving the insulation effect and temperature control accuracy. The design of the sealing gasket's inner diameter being larger than the diameter of the central through hole of the fixed pressure plate avoids interference between the sealing gasket and the guide groove, while also reserving space for the thermal expansion of the guide groove. The sealing gasket, made of high-temperature resistant rubber material, maintains good elasticity and sealing performance even in high-temperature environments, compensating for changes in the fitting clearance caused by thermal expansion, ensuring a reliable sealing effect throughout the entire operating temperature range, and preventing heat loss and the intrusion of external cold air.

[0026] Compared with existing technologies, the beneficial effects of the gradient insulation layer component of the heat treatment insulation control device provided by this utility model are as follows: This utility model achieves a gradient distribution of the insulation layer by setting multiple annular grooves on the inner wall of the insulation cylinder and cooperating with gradient adjustment rings of different thicknesses. This ensures that the amount and distribution of insulation material match the actual heat transfer law, avoiding material waste and improving insulation efficiency. The precise positioning mechanism formed by the radial boss and the guide groove of the guide body ensures that the position of each insulation layer is stable during operation and will not shift due to thermal expansion or vibration. The spiral guide groove design allows the gradient adjustment ring to be finely adjusted by rotation, facilitating rapid adjustment of the insulation layer distribution according to different heat treatment process requirements. The use of the fixed pressure plate and sealing gasket ensures effective sealing at the ends and reserves space for thermal expansion of the guide groove, avoiding the generation of thermal stress. The setting of longitudinal reinforcing ribs significantly improves the overall rigidity of the insulation cylinder and maintains the shape accuracy of the annular grooves. The reasonable combination of stainless steel and ceramic fiber materials balances structural strength and insulation performance. The entire component has a simple structure, few parts, and is easy to assemble and maintain. It can work stably for a long time in high-temperature environments and is suitable for various heat treatment processes that require precise temperature control. Compared with existing technologies, it has significant advantages such as good heat preservation, flexible adjustment, stable structure, long service life, 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 An example diagram of a gradient insulation layer component for a heat treatment insulation control device;

[0029] Figure 2 An assembly drawing of a gradient insulation layer component for a heat treatment insulation control device;

[0030] The attached diagram lists the components represented by each number as follows:

[0031] 10. Insulation cylinder; 11. Annular groove; 20. Gradient adjustment ring; 21. Radial boss; 30. Fixed pressure plate; 40. Guide groove; 41. Guide groove. Detailed Implementation

[0032] 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.

[0033] like Figure 1 , Figure 2 The diagram shows an example of a gradient insulation layer assembly of a heat treatment insulation control device provided by this utility model. It includes an insulation cylinder 10, a gradient adjustment ring 20, a fixing plate 30, and a guide groove 40. The insulation cylinder 10 has a cylindrical structure. Multiple annular grooves 11 are provided on the inner wall of the insulation cylinder 10 along the axial direction. The gradient adjustment ring 20 is embedded in the annular grooves 11, and its outer circumferential surface is in contact with the inner wall surface of the annular grooves 11. The inner circumferential surface of the gradient adjustment ring 20 extends towards the central axis of the insulation cylinder 10 to form several evenly distributed radial protrusions 21. The fixing plate 30 is bolted to the end of the insulation cylinder 10. A through hole is provided at the center of the fixing plate 30. The guide groove 40 passes through the through hole and is arranged along the axial direction of the insulation cylinder 10. Several guide grooves 41 are formed on the outer surface of the guide groove 40 along the axial direction. The inner end face of the radial protrusions 21 contacts the groove wall of the guide groove 41.

[0034] The specific operation or usage method is as follows: During installation, first, place the guide groove vertically and fix it on the workbench. Then, according to the specific heat treatment process requirements and temperature distribution needs, select gradient adjustment rings of appropriate thickness and install them onto the guide groove in order from thinnest to thickest, ensuring that the radial protrusions of each gradient adjustment ring are aligned and inserted into the corresponding spiral guide grooves on the surface of the guide groove. Next, insert the insulation cylinder from above, allowing the gradient adjustment rings to be embedded sequentially into the corresponding annular grooves on the inner wall of the insulation cylinder. By rotating the gradient adjustment rings, the axial position of each insulation layer is adjusted using the spiral guide grooves until the gradient distribution required by the design is achieved. Then, place a sealing gasket on the mating surface between the insulation cylinder and the fixed pressure plate, cover the end of the insulation cylinder with the fixed pressure plate, allowing the guide groove to pass through the through hole in the center of the fixed pressure plate, and fasten the fixed pressure plate to the insulation cylinder with bolts, applying appropriate preload to compress each layer of insulation material. During use, when the insulation effect needs to be adjusted, simply loosen the bolts fixing the pressure plate and rotate the corresponding gradient adjustment ring to change the position of that layer of insulation material. After adjustment, retighten the bolts. Regularly check the tightness of the bolts and the sealing performance of the gaskets, and replace aged gaskets if necessary to ensure the sealing effect and insulation performance of the device.

[0035] In the above technical solution, the thickness of the gradient adjustment ring 20 along the axial direction of the insulation cylinder increases from the end closer to the fixed pressure plate 30 to the end farther away from the fixed pressure plate 30.

[0036] Furthermore, in the above technical solution, the groove depth of the annular groove 11 increases from the end near the fixed pressure plate 30 to the end away from the fixed pressure plate 30, and the distance between two adjacent annular grooves 11 gradually increases along the axial direction.

[0037] Furthermore, in the above technical solution, the radial boss 21 has a fan-shaped cross-section structure, and the radial boss 21 is evenly distributed along the circumference of the insulation cylinder 10, forming a fan-shaped cavity between two adjacent radial bosses 21.

[0038] Furthermore, in the above technical solution, the cross-section of the guide groove 40 is polygonal, the guide grooves are spirally distributed along the axial direction of the guide groove 40, and the bottom width of the guide groove 41 is smaller than the opening width.

[0039] Furthermore, in the above technical solution, the fixed pressure plate 30 has an annular disc structure, the outer diameter of the fixed pressure plate 30 is equal to the outer diameter of the insulation cylinder 10, and the thickness of the fixed pressure plate 30 gradually decreases from the outer edge to the center in the radial direction.

[0040] Furthermore, in the above technical solution, multiple longitudinal reinforcing ribs are formed on the inner wall surface of the heat insulation cylinder 10 along the axial direction. The height of the longitudinal reinforcing ribs is less than the groove depth of the annular groove 11, and the longitudinal reinforcing ribs are connected to the groove wall of the adjacent annular groove 11.

[0041] Furthermore, in the above technical solution, the inner end face of the radial boss 21 has an arc-shaped concave structure, and the radius of curvature of the arc-shaped concave structure matches the radius of curvature of the bottom of the guide groove 41, forming a sliding fit relationship between the radial boss 21 and the guide groove 40.

[0042] Furthermore, in the above technical solution, the heat-insulating cylinder 10 is made of stainless steel, and the gradient adjustment ring 20 is made of ceramic fiber.

[0043] Furthermore, in the above technical solution, a sealing gasket is provided between the fixed pressure plate 30 and the insulation cylinder 10. The sealing gasket has an annular structure, and its inner diameter is larger than the diameter of the central through hole of the fixed pressure plate 30. The sealing gasket is made of high-temperature resistant rubber material.

[0044] Specific Embodiment 1: In this embodiment, the insulation cylinder is made of 304 stainless steel, with an outer diameter of 600mm, an inner diameter of 400mm, a wall thickness of 3mm, and a total length of 800mm. Five annular grooves are evenly distributed along the axial direction on the inner wall of the insulation cylinder. The first annular groove is 50mm from the end face of the fixed pressure plate, with a groove depth of 15mm and a groove width of 20mm. The center distance between adjacent grooves is 150mm, and the groove depths increase sequentially to 15mm, 20mm, 25mm, 30mm, and 35mm, forming a clear depth gradient. The gradient adjustment rings are molded from 1260 type ceramic fiber material with a density of 300kg per cubic meter and a thermal conductivity of 0.08W per meter per Kelvin. There are five gradient adjustment rings with thicknesses of 12mm, 16mm, 20mm, 24mm, and 28mm, respectively, matching the groove depth of the corresponding annular grooves. Each gradient adjustment ring has an outer diameter of 396mm and an inner diameter of 200mm, allowing it to be tightly embedded in the annular groove. Each gradient adjustment ring has eight radial bosses with fan-shaped cross-sections evenly distributed circumferentially on its inner circumferential surface. Each boss has a radial length of 80 mm, a circumferential width of 40 mm, and a thickness of 10 mm. The inner end face of the boss is machined into an arc-shaped recessed surface with a radius of 6 mm. The guide groove is made of aluminum alloy with a regular octagonal cross-section, a circumscribed circle diameter of 60 mm, and a length of 850 mm. Eight spiral guide grooves are machined axially on its surface, with a helix angle of 5 degrees. The guide groove is 12 mm deep, has a groove opening width of 45 mm, and a groove bottom width of 38 mm. The groove bottom is machined into an arc surface with a radius of 6 mm, which fits perfectly with the arc-shaped recessed surface of the radial boss. The fixing plate is an annular disc structure with an outer diameter of 600mm and an inner diameter of 70mm. It is made of Q235 carbon steel, with an outer edge thickness of 10mm, gradually thinning to 6mm towards the center. Twelve 10mm diameter bolt holes are evenly distributed circumferentially along the outer edge, corresponding to the threaded holes on the end face of the insulation cylinder. The sealing gasket is made of silicone rubber, with a temperature resistance rating of 300℃, an outer diameter of 580mm, an inner diameter of 80mm, and a thickness of 5mm. Twelve longitudinal reinforcing ribs are machined axially along the inner wall of the insulation cylinder, evenly distributed around the circumference. The ribs are 10mm high and 8mm wide, smoothly connecting to the groove walls of each annular groove to form an integral reinforced structure. In practical use, the gradient insulation layer assembly is installed on the outside of the processing cylinder of the heat treatment furnace. The internal temperature of the processing cylinder is 1000℃. Through the insulation effect of the gradient insulation layer assembly, the temperature of the outer surface of the insulation cylinder is controlled below 80℃. The temperature forms a gentle gradient distribution in the radial direction, and the insulation effect is stable and reliable. After working in a high-temperature environment for 6000 hours, each layer of insulation material still maintains good structural integrity and no loosening or displacement occurs.

[0045] Specific Embodiment 2: This Embodiment 2 is based on Embodiment 1, increasing the number of radial bosses on the gradient adjustment ring from 8 to 12, and correspondingly reducing the circumferential width of each boss to 25mm. The fan-shaped cavity between the bosses is also reduced. This improvement increases the number of contact points between the radial bosses and the guide groove, enhancing the support stability and load-bearing capacity of the gradient adjustment ring, making the position of the insulation layer more stable under high temperature and vibration environments. Simultaneously, the number of spiral guide grooves on the guide groove is increased to 12, and the spiral helix angle is adjusted to 3 degrees, resulting in more precise axial displacement during rotational adjustment. Each 30-degree rotation corresponds to approximately 3mm of axial displacement, facilitating more accurate control of the insulation layer position. A 3mm thick stainless steel washer is added between the insulation cylinder and the fixed pressure plate to disperse the bolt preload, preventing deformation of the fixed pressure plate edge due to stress concentration, improving sealing performance and service life. This is suitable for heat treatment processes with large temperature fluctuations or requiring frequent adjustments to the insulation layer configuration.

[0046] Specifically, the principle of this invention is as follows: Based on the fundamental laws of heat transfer and the design concept of gradient insulation, this invention constructs an insulation layer distribution structure that conforms to temperature gradient changes by setting multiple annular grooves with increasing depth along the axial direction on the inner wall of the insulation cylinder, in conjunction with gradient adjustment rings with increasing thickness. The insulation layer near the heat source is thinner because the temperature and heat flux density in this area are high, and moderate insulation is sufficient to meet the requirements. The insulation layer further away from the heat source gradually thickens to compensate for the decrease in insulation efficiency after the temperature drops. This gradient distribution makes the entire insulation system form an insulation capacity distribution in the radial direction that matches the actual heat transfer law, avoiding waste of inner layer material and ensuring sufficient insulation effect of the outer layer. The radial bosses formed by the extension of the inner circumference of the gradient adjustment ring cooperate with the guide grooves on the surface of the guide groove to form a stable mechanical positioning mechanism. Utilizing the geometric constraint relationship between the groove and the boss, each layer of insulation material is precisely fixed in the designed position, preventing displacement caused by thermal expansion or vibration. The guide grooves feature a spiral distribution design, allowing the gradient adjustment ring to achieve continuous axial position adjustment through rotation. This adjustment mechanism is similar to the principle of threaded transmission, with a definite geometric relationship between the rotation angle and axial displacement, facilitating precise position control. The fixing plate applies axial preload to the entire assembly via bolts, compressing each layer of insulation material to form a stable laminated structure. Simultaneously, the elastic deformation of the sealing gasket absorbs the stress generated by thermal expansion, preventing deformation or damage that might occur with rigid connections. The longitudinal reinforcing ribs enhance the bending stiffness and deformation resistance of the insulation cylinder, ensuring that the annular groove maintains its shape accuracy under high temperature and load conditions, thus guaranteeing the normal operation of the gradient adjustment ring.

Claims

1. A gradient insulation layer assembly for a heat treatment insulation control device, comprising an insulation cylinder, a gradient adjustment ring, a fixing plate, and a guide groove, wherein the insulation cylinder has a cylindrical structure, characterized in that, The inner wall of the insulation cylinder is provided with multiple annular grooves along the axial direction. The gradient adjustment ring is embedded in the annular grooves, and the outer circumferential surface of the gradient adjustment ring is in contact with the inner wall surface of the annular groove. The inner circumferential surface of the gradient adjustment ring extends towards the central axis of the insulation cylinder to form several evenly distributed radial bosses. The fixing plate is connected to the end of the insulation cylinder by bolts. A through hole is provided at the center of the fixing plate. The guide groove passes through the through hole and is arranged along the axial direction of the insulation cylinder. Several guide grooves are opened on the outer surface of the guide groove along the axial direction. The inner end face of the radial boss is in contact with the groove wall of the guide groove.

2. The gradient insulation layer assembly of the heat treatment insulation control device according to claim 1, characterized in that, The thickness of the gradient adjustment ring along the axial direction of the insulation cylinder increases from the end closer to the fixed pressure plate to the end farther away from the fixed pressure plate.

3. The gradient insulation layer assembly of a heat treatment insulation control device according to claim 2, characterized in that, The depth of the annular groove increases from the end closest to the fixed pressure plate to the end furthest from the fixed pressure plate, and the distance between two adjacent annular grooves gradually increases along the axial direction.

4. The gradient insulation layer assembly of a heat treatment insulation control device according to claim 3, characterized in that, The radial bosses have a fan-shaped cross-section structure and are evenly distributed along the circumference of the insulation cylinder, forming a fan-shaped cavity between two adjacent radial bosses.

5. The gradient insulation layer assembly of a heat treatment insulation control device according to claim 4, characterized in that, The cross-section of the guide groove is polygonal, and the guide grooves are spirally distributed along the axial direction of the guide groove. The bottom width of the guide groove is smaller than the opening width.

6. The gradient insulation layer assembly of a heat treatment insulation control device according to claim 5, characterized in that, The fixed pressure plate has an annular disc structure, and the outer diameter of the fixed pressure plate is equal to the outer diameter of the heat insulation cylinder. The thickness of the fixed pressure plate gradually decreases from the outer edge to the center in the radial direction.

7. The gradient insulation layer assembly of a heat treatment insulation control device according to claim 6, characterized in that, Multiple longitudinal reinforcing ribs are formed along the axial direction on the inner wall surface of the heat-insulating cylinder. The height of the longitudinal reinforcing ribs is less than the groove depth of the annular groove, and the longitudinal reinforcing ribs are connected to the groove wall of the adjacent annular groove.

8. The gradient insulation layer assembly of a heat treatment insulation control device according to claim 7, characterized in that, The inner end face of the radial boss has an arc-shaped concave structure, and the radius of curvature of the arc-shaped concave structure matches the radius of curvature of the bottom of the guide groove. The radial boss and the guide groove form a sliding fit relationship.

9. The gradient insulation layer assembly of a heat treatment insulation control device according to claim 8, characterized in that, The heat-insulating cylinder is made of stainless steel, and the gradient adjustment ring is made of ceramic fiber.

10. The gradient insulation layer assembly of a heat treatment insulation control device according to claim 9, characterized in that, A sealing gasket is provided between the fixed pressure plate and the heat insulation cylinder. The sealing gasket has an annular structure, and its inner diameter is larger than the diameter of the central through hole of the fixed pressure plate. The sealing gasket is made of high-temperature resistant rubber material.

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