A quenching device for a roller hearth kiln

Abstract

The application discloses a quenching device of a roller kiln, and relates to the technical field of ceramic production, which aims to solve the technical problem of how to reduce the accumulation of residual stress in the production process of ceramic slabs and make the residual stress uniformly distributed to improve the processing performance of products. The quenching device comprises a kiln body, wherein the kiln body is internally provided with a kiln body cavity; a conveying device is arranged in the kiln body cavity and used for conveying ceramic products; the upper surface and the lower surface of the ceramic products are respectively divided into a plurality of equal division areas; a plurality of temperature detection devices are arranged, wherein each temperature detection device comprises a plurality of temperature sensors; a plurality of quenching devices are sequentially arranged above different positions of the equal division areas according to the different brick walking directions in the kiln body, wherein each quenching device comprises a quenching fan and a plurality of quenching branch air pipes; the quenching branch air pipes are in communication with the quenching fan and are arranged in the kiln body cavity.

Description

Technical Field

[0001] This application relates to the field of ceramic production technology, and in particular to a quenching device for a roller kiln. Background Technology

[0002] In recent years, a new type of ceramic product—large ceramic slabs—has been widely used in various fields. With its rich textures and excellent acid and alkali resistance, high hardness, and high-temperature resistance, large ceramic slabs are gaining increasing market share in high-end decoration and home furnishings. However, because large ceramic slabs often require cutting, grooving, chamfering, drilling, and even bending during processing, slabs produced with current technology are prone to cracking, breaking, or even shattering during post-processing, severely restricting their large-scale application in home furnishings, furniture, and architectural decoration. According to relevant research, cracking in ceramic products during processing is mainly due to the accumulation of unevenly distributed residual thermal stress during production. Currently, most architectural ceramics are produced using roller kilns through rapid firing, with firing times typically controlled between 60 and 120 minutes. The sintering process involves several stages, including preheating, oxidation decomposition, high-temperature sintering, rapid cooling, and slow cooling. However, due to the short sintering time in the roller kiln, rapid cooling is necessary after high-temperature sintering before the ceramics can be removed from the kiln and become finished products. If the temperature control during rapid cooling is uneven, it can easily lead to a large accumulation of uneven residual thermal stress in the finished product. This is particularly true in the production of large ceramic slabs, which are currently very popular in the market. Due to their larger size (currently, the largest ceramic slabs produced in the industry can reach 1.6 x 3.2 meters or more), the difficulty of controlling thermal stress during the production of large ceramic slabs is significantly higher than that of ordinary ceramics. The large amount of residual thermal stress accumulated during the sintering process and its uneven distribution make the large ceramic slabs prone to cracking and shattering during later processing. Therefore, how to reduce the accumulation of residual stress during the production of large ceramic slabs and ensure its even distribution to improve the product's processing performance is a pressing technical problem that needs to be solved.

[0003] Therefore, existing technologies still need improvement and development. Summary of the Invention

[0004] In view of the shortcomings of the prior art, this application provides a rapid cooling device for a roller kiln to solve the urgent technical problem of how to reduce the accumulation of residual stress during the production of large ceramic slabs and make it evenly distributed, thereby improving the processing performance of the product.

[0005] To address the aforementioned technical problems, a first aspect of this application provides a quenching device for a roller kiln, the quenching device comprising:

[0006] The kiln body has an internal cavity.

[0007] A conveying device is installed inside the kiln cavity for conveying ceramic products; the upper and lower surfaces of the ceramic products are respectively divided into several equally divided areas.

[0008] Several temperature detection devices, wherein the temperature detection devices include several temperature sensors;

[0009] A plurality of quenching devices are arranged sequentially above the uniformly divided area at different positions according to the brick-moving direction inside the kiln. Each quenching device includes a quenching fan and a plurality of quenching branch ducts. The plurality of quenching branch ducts are connected to the quenching fan and are located inside the kiln cavity. The quenching branch ducts are arranged corresponding to the uniformly divided area. The number of temperature sensors corresponds one-to-one with the number of quenching branch ducts. The temperature sensors are arranged on the inner wall of the kiln body and are located after the quenching branch ducts according to the brick-moving direction inside the kiln. They are used to detect the temperature of each uniformly divided area of ​​the ceramic product after quenching. A first electronic pressure valve is provided on each quenching branch duct.

[0010] A fan control device is connected to the temperature sensor, the quench fan, and the first electronic pressure valve.

[0011] In one implementation, each of the quench branch ducts is provided with two air outlets in the direction of brick movement inside the kiln, and each adjacent air outlet is evenly distributed in a crisscross pattern.

[0012] In one implementation, the quenching device further includes a quenching main duct and a second electronic pressure valve. The quenching main duct is connected to the quenching air outlet of the quenching fan. The quenching branch duct is installed on the quenching main duct. The second electronic pressure valve is installed on the quenching main duct or between the quenching main duct and the quenching fan, and is connected to the fan control device.

[0013] In one implementation, the quenching device further includes an exhaust fan, which includes an exhaust fan and several branch exhaust pipes. The fan control device is connected to the exhaust fan, and the several branch exhaust pipes are connected to the exhaust fan.

[0014] In one implementation, the exhaust device further includes a main exhaust pipe and an exhaust control valve. The main exhaust pipe is connected to the exhaust port of the exhaust fan. The branch exhaust pipe is disposed on the main exhaust pipe. The exhaust control valve is disposed on the main exhaust pipe or between the main exhaust pipe and the exhaust fan, and is connected to the fan control device.

[0015] In one implementation, the kiln body includes refractory bricks, refractory cotton, and a metal layer, which are stacked from the inside out in the kiln body to form the kiln inner cavity. The height of the kiln inner cavity is 2-3m and the width is 1.5-2.4m.

[0016] In one implementation, the quenching equipment further includes an installation platform, which is disposed on the kiln body and used to house the quenching fan and the exhaust fan.

[0017] A second aspect of this application provides a method for controlling residual thermal stress in ceramic products, characterized in that the method is applied to the quenching equipment of a roller kiln as described above, and the method includes:

[0018] Rapid cooling is performed on each uniformly divided area of ​​the ceramic product during the conveying process. The ceramic product is located in the inner cavity of the kiln, and the upper and lower surfaces of the ceramic product are divided into several uniformly divided areas.

[0019] Detect the current temperature value of each uniformly divided region in a ceramic product after rapid cooling treatment;

[0020] The current temperature value is compared with the preset temperature value, and the opening degree of the first electronic pressure valve corresponding to the current temperature value is controlled according to the comparison result so that the current temperature value is within the preset temperature range. The first electronic pressure valve corresponds one-to-one with each evenly divided area on the ceramic product.

[0021] In one implementation, comparing the current temperature value with a preset temperature value and controlling the opening degree of the first electronic pressure valve corresponding to the current temperature value according to the comparison result, so that the current temperature value is within the preset temperature range, specifically includes:

[0022] Compare the current temperature value with the preset temperature value;

[0023] When the current temperature value is greater than the preset temperature value, the opening degree of the first electronic pressure valve corresponding to the current temperature value is increased;

[0024] When the current temperature value is less than the preset temperature value, the opening degree of the first electronic pressure valve corresponding to the current temperature value is reduced.

[0025] In one implementation, the method further includes:

[0026] The current kiln pressure inside the kiln is detected, and the current kiln pressure is compared with the preset kiln pressure to ensure that the current kiln pressure is within the preset kiln pressure range;

[0027] When the kiln pressure is greater than the preset kiln pressure, increase the opening of the suction control valve;

[0028] When the kiln pressure is less than the preset range, reduce the opening of the suction control valve.

[0029] Beneficial Effects: This application divides the upper and lower surfaces of ceramic products on the conveying device into several equal-sized areas. Rapid cooling branch ducts are installed on the upper and lower surfaces of each equal-sized area to rapidly cool each area of ​​the ceramic product. Several rapid cooling branch ducts are sequentially installed at different positions within each equal-sized area according to the brick-moving direction inside the kiln to continuously cool the ceramic product after high-temperature sintering. Temperature sensors are installed after each rapid cooling branch duct to detect the temperature of each equal-sized area after rapid cooling. Based on the temperature of each equal-sized area, the opening of the first electronic pressure valve on each rapid cooling branch duct is adjusted by a fan control device to ensure that the temperature of each equal-sized area of ​​the ceramic product is controlled within a certain range after rapid cooling. This not only meets the temperature requirements after rapid cooling but also ensures that the temperature difference between the different equal-sized areas of the rapidly cooled ceramic product is within an allowable range, achieving a rapid and uniform cooling effect for the ceramic product. This reduces residual thermal stress in the ceramic product and avoids the phenomenon of residual thermal stress concentration, effectively improving the quality of the ceramic product. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a front view structural schematic diagram of a quenching device for a roller kiln provided in this application.

[0032] Figure 2 This is a side view of the quenching equipment of a roller kiln provided in this application.

[0033] Figure 3 This application provides a schematic diagram of the structure in which ceramic products are divided into several regions in a quenching device for a roller kiln.

[0034] Figure 4 This is a schematic diagram showing the structure of two air outlets of each quenching branch pipe in a roller kiln, as shown in this application, mapped onto ceramic products.

[0035] Figure 5This application provides a flowchart of a method for controlling residual thermal stress in ceramic products. In the diagram: 1. Kiln body; 11. Refractory brick; 12. Refractory wool; 13. Metal layer; 2. Conveying device; 21. High-temperature resistant roller; 3. Rapid cooling device; 31. Rapid cooling fan; 32. Main rapid cooling duct; 33. Branch rapid cooling duct; 331. Air outlet; 34. Second electronic pressure valve; 4. Exhaust device; 41. Exhaust fan; 42. Main exhaust duct; 43. Branch exhaust duct; 44. Exhaust control valve; 5. Fan control device; 6. Platform; 7. Area location. Detailed Implementation

[0036] This application provides a quenching device for a roller kiln. To make the purpose, technical solution, and effects of this application clearer and more explicit, the following detailed description is provided with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining this application and are not intended to limit this application.

[0037] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0038] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0039] The application content will be further explained below with reference to the accompanying drawings and the description of the embodiments.

[0040] The first aspect of this embodiment provides a quenching device for a roller kiln, such as... Figure 1-2As shown, the rapid cooling equipment includes a kiln body 1, a conveying device 2, several temperature detection devices, several rapid cooling devices, and a fan control device 5. The kiln body 1 has an inner cavity. The conveying device 2 is used to convey ceramic products and is located in the inner cavity of the kiln body, dividing the inner cavity into upper and lower layers, so that the upper and lower surfaces of the ceramic products are respectively hollowed out in the upper and lower layers of the inner cavity of the kiln body. The upper and lower surfaces of the ceramic products located on the conveying device 2 are respectively divided into several equally divided areas. Each temperature detection device includes several temperature sensors (not shown in the figure). Several rapid cooling devices are sequentially distributed above the equally divided areas at different positions according to the brick-moving direction in the kiln body 1. Each rapid cooling device... All include a rapid cooling fan 31 and several rapid cooling branch ducts 33. The rapid cooling fan 31 is located outside the kiln body 1, and the several rapid cooling branch ducts 33 are connected to the rapid cooling fan 31 and pass through the kiln body 1, located in the inner cavity of the kiln. It can be understood that the several rapid cooling branch ducts 33 are distributed in the upper and lower layers of the inner cavity. In this embodiment, the evenly divided area is an area that is evenly divided according to the width area perpendicular to the brick-moving direction of the kiln body 1. The evenly divided areas on the upper and lower surfaces of the ceramic product are set opposite to each other. It can be understood that an evenly divided area on the upper surface of the ceramic product must have a corresponding evenly divided area on the lower surface, and an evenly divided area on the upper surface of the ceramic product must have a corresponding evenly divided area on the lower surface. A uniformly divided area on the surface together constitutes a uniformly divided region. Since both the upper and lower surfaces of the ceramic product need to be rapidly cooled, it is understood that the number of rapid cooling branch ducts 33 included in a rapid cooling device is twice the number of uniformly divided regions. That is, within the same uniformly divided region, there are separate uniformly divided regions on the upper and lower surfaces, and each of these regions is correspondingly provided with a rapid cooling branch duct 33. Furthermore, this embodiment provides several rapid cooling devices. It is understood that at the same uniformly divided region on the upper or lower surface of the ceramic product, several rapid cooling branch ducts 33 are arranged according to the brick-moving direction within the kiln body 1 to continuously provide high-temperature firing... After the ceramic products are quenched, each evenly divided area is subjected to rapid cooling. The number of temperature sensors corresponds one-to-one with the number of rapid cooling branch ducts 33. The temperature sensors are set on the inner wall of the kiln body 1 and are located after the rapid cooling branch ducts 33 according to the brick walking direction in the kiln body 1. In this way, after the ceramic products are rapidly cooled, the temperature of each evenly divided area of ​​the ceramic products on the conveying device 2 after rapid cooling can be detected immediately. The rapid cooling branch duct 33 is equipped with a first electronic pressure valve to control the air volume of the rapid cooling branch duct 33 corresponding to the first electronic pressure valve. The fan control device 5 is set outside the kiln body 1 and is connected to the temperature sensor, the rapid cooling fan 31 and the first electronic pressure valve respectively.In this embodiment, the upper and lower surfaces of the ceramic product on the conveying device 2 are divided into several equal-sized regions. A rapid cooling branch duct 33 is installed on both the upper and lower surfaces of each equal-sized region to rapidly cool each region of the ceramic product. Several rapid cooling branch ducts 33 are sequentially installed at different positions within each equal-sized region according to the brick-moving direction in the kiln body 1 to continuously cool the ceramic product after high-temperature sintering. A temperature sensor is installed after each rapid cooling branch duct 33 to detect the temperature of each equal-sized region after rapid cooling. Based on the temperature of each equal-sized region, the fan control device 5 adjusts the fan speed of each rapid cooling branch duct 33 accordingly. The opening degree of the first electronic pressure valve is controlled to ensure that the temperature of each uniformly divided area of ​​the ceramic product is controlled within a certain range after rapid cooling. This not only meets the temperature requirements after rapid cooling but also ensures that the temperature difference between the various uniformly divided areas of the ceramic product is within an allowable range, achieving a rapid and uniform cooling effect. This reduces residual thermal stress in the ceramic product and avoids the occurrence of residual thermal stress concentration, effectively improving the quality of the ceramic product. The opening degree of each first electronic pressure valve corresponding to the same uniformly divided area is uniformly controlled, or in other words, the opening degree of each first electronic pressure valve corresponding to the same uniformly divided area is kept consistent.

[0041] In one embodiment, such as Figure 4 As shown, each of the rapid cooling branch ducts 33 is provided with two air outlets 331 in the direction of brick movement in the kiln body 1. Each adjacent air outlet 331 is evenly distributed in a cross pattern, which is beneficial to controlling the uniformity of the rapid cooling temperature of ceramic products.

[0042] In one embodiment, such as Figure 1-2 As shown, the rapid cooling device also includes a rapid cooling main air duct 32 and a second electronic pressure valve 34. The rapid cooling main air duct 32 is connected to the rapid cooling air outlet (not shown in the figure) of the rapid cooling fan 31 and is distributed and coiled on the left and right sides outside the kiln body 1. One end of several rapid cooling branch air ducts 33 is respectively located on the left and right sides of the rapid cooling main air duct 32 outside the kiln body 1, and the other end of several rapid cooling branch air ducts 33 passes through the kiln body 1 and is evenly distributed in the upper and lower layers of the kiln body cavity. Several rapid cooling branch air ducts 33 correspond to various areas of the ceramic products, such as... Figure 4As shown, the ceramic products on the conveying device 2 are evenly divided into several regions 7. For example, the ceramic products are evenly divided into 6 regions, each region corresponding to a corresponding quenching branch duct 33, so that each quenching branch duct 33 can blow air to each region 7 of the ceramic products on the conveying device 2 inside the kiln cavity. The second electronic pressure valve 34 is connected to the fan control device 5. The second electronic pressure valve 34 can be set on the quenching main duct 32, or it can be set between the quenching main duct 32 and the quenching fan 31. In this embodiment, as shown... Figure 1 As shown, the second electronic pressure valve 34 is installed on the quench main air duct 32. In this embodiment, the opening degree of the second electronic pressure valve 34 can be controlled by the fan control device 5. For example, the opening degree of the second electronic pressure valve 34 can be increased to accelerate the cooling speed of the quench fan 31 on the ceramic products, thereby improving the cooling efficiency of the quench fan 31 on the ceramic products.

[0043] In one embodiment, such as Figure 1-2 As shown, the quenching equipment also includes an exhaust device 4, which includes an exhaust fan 41 and several branch exhaust pipes 43. The exhaust fan 41 is connected to the fan control device 5 and is located outside the kiln body 1. The several branch exhaust pipes 43 are connected to the exhaust fan 41 and pass through the kiln body 1 and are located in the inner cavity of the kiln body. The several branch exhaust pipes 43 are distributed in the upper and lower layers of the inner cavity of the kiln body. In this embodiment, by setting the exhaust fan 41 and using the branch exhaust pipes 43, the hot air inside the kiln body 1 is extracted to the outside of the kiln body 1.

[0044] In one embodiment, such as Figure 1-2As shown, the exhaust device 4 also includes a main exhaust pipe 42 and an exhaust control valve 44. The main exhaust pipe 42 is connected to the exhaust port (not shown in the figure) of the exhaust fan 41 and is distributed and coiled on the upper and lower sides of the kiln body 1. One end of several branch exhaust pipes 43 is respectively set on the upper and lower sides of the main exhaust pipe 42 outside the kiln body 1, and one end of several branch exhaust pipes 43 passes through the kiln body 1 and is evenly distributed in the upper and lower layers of the kiln body cavity. The exhaust control valve 44 is connected to the fan control device 5. The exhaust control valve 44 can be set on the main exhaust pipe 42. It can also be set between the main air duct and the exhaust fan 41. In this embodiment, as shown in the figure, the suction control valve 44 is set on the main exhaust duct 42. In order to ensure that the pressure inside the kiln body 1 is stable at a fixed value, this embodiment sets the suction control valve 44 and controls the opening of the suction control valve 44 through the fan control device 5 to accurately control the exhaust volume of the exhaust fan 41. When the kiln pressure inside the kiln body 1 is too high, the opening of the suction control valve 44 can be increased; when the kiln pressure inside the kiln body 1 is too low, the opening of the suction control valve 44 can be decreased, thereby stabilizing the pressure inside the kiln body.

[0045] In one embodiment, such as Figure 1-2 As shown, the kiln body 1 includes refractory bricks 11, refractory cotton 12, and a metal layer 13. The refractory bricks 11, refractory cotton 12, and metal layer 13 are stacked from the inside out in the kiln body 1 to form the inner cavity of the kiln body 1. Since a kiln body 1 that is too narrow can easily lead to low production efficiency, while a kiln that is too wide can easily lead to a large temperature difference in the kiln, in this embodiment, the height of the inner cavity of the kiln is set to 2-3m, and the width of the inner cavity of the kiln is set according to the width of the roller kiln, and is kept consistent with it, generally between 1.5-2.4m. With this setting, compared with existing kilns, not only can the production efficiency be improved, but also the excessive temperature difference in the kiln can be avoided.

[0046] In one embodiment, such as Figure 1-2 As shown, the conveying device 2 includes high-temperature resistant rollers 21 and a continuously variable motor (not shown in the figure). The continuously variable motor is located on the side of the kiln body 1. Several high-temperature resistant rollers 21 pass through the kiln body 1 and are connected to the drive end of the continuously variable motor. The continuously variable motor drives the high-temperature resistant rollers 21 to rotate, thereby achieving the purpose of transporting ceramic products.

[0047] In one embodiment, such as Figure 1-2 As shown, the quenching equipment also includes a platform 6, and the quenching fan 31 and the exhaust fan 41 are both installed on the platform 6 to prevent the quenching fan 31 and the exhaust fan 41 from overheating on the kiln body 1 and being easily damaged.

[0048] The second aspect of this embodiment also provides a method for controlling residual thermal stress in ceramic products, the method being applied to the quenching equipment of the roller kiln described above, such as... Figure 5 As shown, the method includes:

[0049] S10. Rapid cooling treatment is performed on each uniformly divided area of ​​the ceramic product during the conveying process, wherein the ceramic product is located in the cavity of the kiln, and the upper and lower surfaces of the ceramic product are divided into several uniformly divided areas.

[0050] S20. Detect the current temperature value of each uniformly divided region in the ceramic product after rapid cooling treatment.

[0051] S30. Compare the current temperature value with the preset temperature value, and control the opening degree of the first electronic pressure valve corresponding to the current temperature value according to the comparison result, so that the current temperature value is within the preset temperature range, wherein the first electronic pressure valve corresponds one-to-one with each evenly divided area on the ceramic product.

[0052] Specifically, the preset temperature value is a pre-set temperature value, which can be 500℃, and the preset temperature range is 505℃ or 495℃. It can be understood that after the ceramic product is rapidly cooled in each uniform area during the conveying process, the temperature difference between the current temperature values ​​of each uniform area of ​​the ceramic product should be less than 5℃. This achieves uniform temperature control during the rapid cooling stage, so as to avoid residual thermal stress caused by uneven temperature control during the rapid cooling process, which could lead to problems such as cracking and shattering of the ceramic slab during later processing.

[0053] In one embodiment, comparing the current temperature value with a preset temperature value and controlling the opening degree of the first electronic pressure valve corresponding to the current temperature value according to the comparison result, so that the current temperature value is within the preset temperature range, specifically includes:

[0054] S301. Compare the current temperature value with the preset temperature value;

[0055] S302. When the current temperature value is greater than the preset temperature value, increase the opening degree of the first electronic pressure valve corresponding to the current temperature value;

[0056] S303. When the current temperature value is less than the preset temperature value, reduce the opening of the first electronic pressure valve corresponding to the current temperature value.

[0057] Specifically, assuming the preset temperature value is 500℃ and the preset temperature range is 505℃ or 495℃, the current temperature value of each evenly divided area of ​​the ceramic plate after rapid cooling is detected. When the current temperature value is greater than 505℃, the opening degree of all first electronic pressure valves corresponding to the evenly divided area corresponding to the current temperature value is increased simultaneously. The pressure opening degree of all first electronic valves corresponding to the same evenly divided area is the same. When the current temperature value is less than 495℃, the opening degree of all first electronic pressure valves corresponding to the evenly divided area corresponding to the current temperature value is decreased simultaneously, so that the current temperature of each evenly divided area is within the range of 495℃-505℃.

[0058] In one embodiment, the method further includes:

[0059] S401. Detect the current kiln pressure inside the kiln, and compare the current kiln pressure with the preset kiln pressure to ensure that the current kiln pressure is within the preset kiln pressure range;

[0060] S402. When the kiln pressure is greater than the preset kiln pressure, increase the opening of the suction control valve;

[0061] S403. When the kiln pressure is less than the preset range, reduce the opening of the suction control valve.

[0062] Specifically, during the rapid cooling stage, when cooling the ceramic products, it is necessary to ensure that the kiln pressure inside the kiln remains stable at a fixed value. Therefore, it is necessary to control the pressure inside the kiln. In this embodiment, an exhaust fan can be installed to extract the hot air after the rapid cooling process, thus drawing the hot air from inside the kiln to the outside. To ensure that the pressure inside the kiln remains stable at a fixed value, a suction control valve can be installed in the branch exhaust pipe of the exhaust fan. The opening of the suction control valve can be used to precisely control the exhaust volume of the exhaust fan. When the kiln pressure inside the kiln is greater than the preset range, that is, greater than the fixed value, the opening of the suction control valve is increased; when the kiln pressure inside the kiln is less than the preset range, that is, less than the fixed value, the opening of the suction control valve is decreased. This process continues until the kiln pressure is within the preset range, thereby stabilizing the pressure inside the kiln cavity.

[0063] In conclusion, this embodiment provides a rapid cooling device for a roller kiln. The rapid cooling device includes a kiln body 1, a conveying device 2, several temperature detection devices, several rapid cooling devices, and a fan control device 5. The kiln body 1 has an internal cavity. The conveying device 2 is used to convey ceramic products and is arranged in the internal cavity of the kiln, dividing the internal cavity into upper and lower layers, so that the upper and lower surfaces of the ceramic products are respectively hollowed out in the upper and lower layers of the internal cavity of the kiln. The upper and lower surfaces of the ceramic products on the conveying device 2 are respectively divided into several equally divided areas. Each temperature detection device includes several temperature sensors. Several rapid cooling devices are sequentially distributed in the equally divided areas according to the brick movement pattern in the kiln body 1. Above different locations, each quenching device includes a quenching fan 31 and several quenching branch ducts 33. The quenching fan 31 is located outside the kiln body 1, and the several quenching branch ducts 33 are connected to the quenching fan 31 and pass through the kiln body 1, located within the inner cavity of the kiln. It can be understood that the several quenching branch ducts 33 are distributed in the upper and lower layers of the inner cavity. In this embodiment, the evenly divided area is an area evenly divided according to the width of the area perpendicular to the brick-moving direction of the kiln body 1. The evenly divided areas on the upper and lower surfaces of the ceramic product are oppositely arranged. It can be understood that for every evenly divided area on the upper surface of the ceramic product, there must be a corresponding evenly divided area on the lower surface. A uniformly divided region on the upper surface and its corresponding uniformly divided region on the lower surface together constitute a uniformly divided region. Since both the upper and lower uniformly divided regions of the ceramic product need to be rapidly cooled, it is understood that the number of rapid cooling branch ducts 33 included in a rapid cooling device is twice the number of uniformly divided regions. That is, within the same uniformly divided region, there are both uniformly divided regions on the upper and lower surfaces, and each of these regions is correspondingly equipped with a rapid cooling branch duct 33. Furthermore, this embodiment includes several rapid cooling devices. It is understood that at the same uniformly divided region located on the upper or lower surface of the ceramic product, according to the brick-moving direction within the kiln body 1, [the following is a description of a rapid cooling device]. Several rapid cooling branch ducts 33 are used to continuously rapidly cool the various uniformly divided areas of the ceramic products after high-temperature sintering. The number of temperature sensors corresponds one-to-one with the number of rapid cooling branch ducts 33, and the temperature sensors are set on the inner wall of the kiln body 1 and located after the rapid cooling branch ducts 33 according to the brick walking direction in the kiln body 1. In this way, after the ceramic products are rapidly cooled, the temperature of each uniformly divided area of ​​the ceramic products on the conveying device 2 after rapid cooling can be detected immediately. A first electronic pressure valve is provided on the rapid cooling branch duct 33 to control the air volume of the rapid cooling branch duct 33 corresponding to the first electronic pressure valve. The fan control device 5 is connected to the temperature sensor, the rapid cooling fan 31 and the first electronic pressure valve respectively.In this embodiment, the upper and lower surfaces of the ceramic product on the conveying device 2 are divided into several equal-sized regions. A rapid cooling branch duct 33 is installed on both the upper and lower surfaces of each equal-sized region to rapidly cool each region of the ceramic product. Several rapid cooling branch ducts 33 are sequentially installed at different positions within each equal-sized region according to the brick-moving direction in the kiln body 1 to continuously cool the ceramic product after high-temperature sintering. A temperature sensor is installed after each rapid cooling branch duct 33 to detect the temperature of each equal-sized region after rapid cooling. Based on the temperature of each equal-sized region, the fan control device 5 adjusts the fan speed of each rapid cooling branch duct 33 accordingly. The opening degree of the first electronic pressure valve is controlled to ensure that the temperature of each uniformly divided area of ​​the ceramic product is controlled within a certain range after rapid cooling. This not only meets the temperature requirements after rapid cooling but also ensures that the temperature difference between the various uniformly divided areas of the ceramic product is within an allowable range, achieving a rapid and uniform cooling effect. This reduces residual thermal stress in the ceramic product and avoids the occurrence of residual thermal stress concentration, effectively improving the quality of the ceramic product. The opening degree of each first electronic pressure valve corresponding to the same uniformly divided area is uniformly controlled, or in other words, the opening degree of each first electronic pressure valve corresponding to the same uniformly divided area is kept consistent.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A quenching device of a roller kiln, characterized in that, The quenching device comprises: a kiln body, which has a kiln body cavity inside; a conveying device arranged in the kiln body cavity for conveying ceramic products; the upper and lower surfaces of the ceramic products are each divided into a plurality of equally divided regions; a plurality of temperature detection devices, which comprise a plurality of temperature sensors; a plurality of quenching devices, which are sequentially arranged above different positions of the equally divided regions in the kiln body in the direction of the brick laying in the kiln body; the quenching device comprises a quenching fan and a plurality of quenching branch air pipes, which are in communication with the quenching fan and are arranged in the kiln body cavity; the quenching branch air pipes are arranged corresponding to the equally divided regions, the temperature sensors correspond to the quenching branch air pipes one by one, and the temperature sensors are arranged on the inner wall of the kiln body and are located behind the quenching branch air pipes in the direction of the brick laying in the kiln body, for detecting the temperature of each equally divided region of the ceramic products after quenching; the quenching branch air pipes are provided with first electronic pressure valves; a fan control device, which is connected with the temperature sensors, the quenching fan and the first electronic pressure valves respectively; the quenching device further comprises a quenching main air pipe and a second electronic pressure valve; the quenching main air pipe is in communication with the quenching air outlet of the quenching fan and is arranged in a spiral manner on the left and right sides outside the kiln body; one end of each of the quenching branch air pipes is arranged on the left and right sides outside the kiln body of the quenching main air pipe; the other end of each of the quenching branch air pipes penetrates through the kiln body and is evenly arranged on the upper and lower layers in the kiln body cavity; each of the quenching branch air pipes corresponds to each region of the ceramic products; the ceramic products on the conveying device are evenly divided into a plurality of regions; each region corresponds to a corresponding quenching branch air pipe, so that each quenching branch air pipe blows to each region of the ceramic products on the conveying device in the kiln body cavity; the second electronic pressure valve is connected with the fan control device; the quenching branch air pipes are arranged on the quenching main air pipe; the second electronic pressure valve is arranged on the quenching main air pipe or between the quenching main air pipe and the quenching fan and is connected with the fan control device.

2. The quenching device of a roller kiln according to claim 1, characterized in that Each quenching branch air pipe is provided with two air outlets in the direction of the brick laying in the kiln body; adjacent air outlets are evenly distributed in a cross manner.

3. The quenching device of a roller kiln according to claim 1, characterized in that, The quenching device further comprises an air extraction device, which comprises an air extractor and a plurality of branch air extraction pipes; the fan control device is connected with the air extractor; the branch air extraction pipes are in communication with the air extractor.

4. The quenching device of a roller kiln according to claim 3, characterized in that The air extraction device further comprises a main air extraction pipe and an air extraction control valve; the main air extraction pipe is in communication with the air outlet of the air extractor; the branch air extraction pipes are arranged on the main air extraction pipe; the air extraction control valve is arranged on the main air extraction pipe or between the main air extraction pipe and the air extractor and is connected with the fan control device.

5. The quenching device of a roller kiln according to claim 1, characterized in that, The kiln body comprises refractory bricks, refractory cotton and metal layers, which are stacked from inside to outside in the kiln body to form a kiln cavity in the kiln body, wherein the height of the kiln cavity is 2-3 m and the width is 1.5-2.4 m.

6. The quenching device of a roller kiln according to claim 1, characterized in that, The quenching device further comprises a mounting platform arranged on the kiln body and used for placing the quenching fan and the exhaust fan.

7. A method of controlling residual thermal stress in a ceramic article, characterized by, The method is applied to the quenching device of the roller kiln as claimed in any one of claims 1-6, and the method comprises: quenching each of the divided regions of the ceramic product in the conveying process, wherein the ceramic product is located in the kiln cavity, and the upper surface and the lower surface of the ceramic product are divided into a plurality of divided regions; detecting the current temperature value of each of the divided regions of the ceramic product after the quenching; comparing the current temperature value with a preset temperature value, and controlling the opening degree of the first electronic pressure valve corresponding to the current temperature value according to the comparison result, so that the current temperature value is within the preset temperature range, wherein the first electronic pressure valve corresponds to each of the divided regions of the ceramic product one by one.

8. The method of controlling residual thermal stresses in a ceramic article according to claim 7, wherein, The comparison of the current temperature value with the preset temperature value and the control of the opening degree of the first electronic pressure valve corresponding to the current temperature value according to the comparison result so that the current temperature value is within the preset temperature range specifically comprises: comparing the current temperature value with the preset temperature value; when the current temperature value is greater than the preset temperature value, increasing the opening degree of the first electronic pressure valve corresponding to the current temperature value; when the current temperature value is less than the preset temperature value, decreasing the opening degree of the first electronic pressure valve corresponding to the current temperature value. The method further comprises:

9. The method of controlling residual thermal stresses in a ceramic article according to claim 7, wherein, detecting the current kiln pressure in the kiln body, comparing the current kiln pressure with a preset kiln pressure, so that the current kiln pressure is within the preset kiln pressure range; when the kiln pressure is greater than the preset kiln pressure, increasing the opening degree of the suction control valve; when the kiln pressure is less than the preset kiln pressure, decreasing the opening degree of the suction control valve. ​

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