A polycrystalline alumina fiber drying pretreatment device

Abstract

The application discloses a kind of polycrystalline alumina fiber drying pretreatment equipment, it is related to alumina fiber manufacturing technical field, the polycrystalline alumina fiber drying pretreatment equipment includes main frame, heating assembly and conveying assembly, heating cavity is in the main frame, heating assembly is set to main frame, heating assembly is used to pretreat nascent fiber, conveying assembly is set to main frame, conveying assembly is used to transport nascent fiber, the polycrystalline alumina fiber drying pretreatment equipment of the application can pretreat nascent fiber, make its intensity before furnace and relevant state good, guarantee that fiber quality is uniformly excellent, improve product pass rate, and then improve production capacity.

Description

Technical Field

[0001] This application relates to the field of alumina fiber manufacturing technology, and in particular to a drying and pretreatment device for polycrystalline alumina fibers. Background Technology

[0002] Polycrystalline alumina fiber is a polycrystalline inorganic fiber whose main component is alumina. It is one of the newest ultra-lightweight high-temperature insulation materials at home and abroad. It has good heat resistance and good chemical corrosion resistance. It can be used as a heat insulation material for automobiles and spacecraft, and can also be applied to industrial high-temperature furnaces and environmental protection and recycling technologies. It can save fuel and improve the heating speed of materials and production capacity.

[0003] In the existing technology, the nascent fibers in the polycrystalline alumina fiber production process are directly put into the kiln for sintering without drying treatment. At this time, the free water content on the surface of the nascent fibers can be volatilized to a certain extent, and the strength and condition of the green body are relatively good. However, the free water in the middle and lower layers of nascent fibers is not fully volatilized and accumulates inside, causing the nascent fibers to clump and stick together. As a result, after sintering, the finished fiber will have clumping or uneven quality.

[0004] Currently known heat treatment methods for alumina fibers involve passing the nascent fibers through an inert gas containing hydrogen to ensure sufficient contact time, followed by further stretching. After completion, the nascent fibers are placed in a constant temperature and humidity environment for treatment at different stages. However, the above methods are costly, and the equipment requires regular maintenance. Utility Model Content

[0005] The purpose of this application is to provide a pre-treatment equipment for drying polycrystalline alumina fibers, which can pre-treat nascent fibers to avoid caking or uneven quality of finished fibers after sintering.

[0006] To achieve the above objectives, this application provides a polycrystalline alumina fiber drying pretreatment device, comprising: a main frame, a heating assembly, and a conveying assembly;

[0007] The main frame has a heating cavity;

[0008] The heating component is disposed on the main frame and is used to pre-treat the nascent fibers.

[0009] The conveying assembly is located on the main frame and is used to transfer nascent fibers.

[0010] In some embodiments, an observation window is provided at the top of the main frame.

[0011] In some embodiments, the heating assembly includes a plurality of heating elements, which are spaced apart on the sidewalls and bottom of the main frame.

[0012] In some embodiments, each heating element has an independent switch that can adjust the output power of the corresponding heating element.

[0013] In some embodiments, the conveying assembly includes a drive member, a drive roller, and a mesh belt. A plurality of drive rollers are spaced apart on the main frame. The drive rollers are rotatably connected to the main frame. The drive member is mounted on the main frame and its output end is connected to one of the drive rollers. The mesh belt is sleeved on the drive roller.

[0014] In some embodiments, the main frame is further provided with a temperature and humidity monitoring probe, and there are multiple temperature and humidity monitoring probes distributed in the upper space of the main frame.

[0015] In some embodiments, an exhaust assembly is further provided, which includes an exhaust branch pipe, an exhaust main pipe and a fan. The exhaust main pipe is located above the main frame, and a plurality of exhaust branch pipes are located between the exhaust main pipe and the main frame. One end of each exhaust branch pipe is connected to the heating cavity of the main frame, and the other end is connected to the exhaust main pipe. Each exhaust branch pipe contains a fan.

[0016] In some embodiments, a control component is also provided, the control component including a control box and a control board, the control board being disposed inside the control box, and the control board being electrically connected to the heating component, the conveying component, the temperature and humidity monitoring probe and the exhaust component respectively.

[0017] In some embodiments, a heat-resistant pad is provided on the inner sidewall of the main frame.

[0018] In some embodiments, the outer wall of the main frame is provided with a thermal insulation layer, and the bottom surface of the main frame is covered with a thermal insulation layer.

[0019] Compared to the aforementioned background technology, the polycrystalline alumina fiber drying and pretreatment equipment provided in this application includes a main frame, a heating component, and a conveying component. The main frame has a heating chamber, and the heating component is located within the main frame and is used to pretreat the nascent fibers. The conveying component is located within the main frame and is used to transfer the nascent fibers. The nascent fibers are transferred into the heating chamber by the conveying component, where the heating component heats and dries the nascent fibers, thereby evaporating the free water inside the nascent fibers. The heated and dried nascent fibers are discharged from the heating chamber through the conveying component and transported to the sintering kiln. The polycrystalline alumina fiber drying and pretreatment equipment of this application can achieve low-cost pretreatment of nascent fibers, ensuring good strength and related conditions before entering the kiln, guaranteeing uniform and excellent fiber quality, improving product qualification rate, and thus increasing production capacity. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the polycrystalline alumina fiber drying and pretreatment equipment according to an embodiment of this application.

[0022] in:

[0023] 1. Main frame; 2. Heating element; 3. Conveying assembly; 4. Observation window; 5. Temperature and humidity monitoring probe; 6. Exhaust assembly; 61. Main exhaust pipe; 62. Branch exhaust pipe; 7. Control assembly. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] It should be noted that the directional terms such as "upper end," "lower end," "left side," and "right side" mentioned below are defined based on the accompanying drawings in the instruction manual.

[0027] like Figure 1 As shown, the polycrystalline alumina fiber drying pretreatment equipment provided in this application embodiment includes a main frame 1, a heating component and a conveying component 3. The main frame 1 has a heating chamber, the heating component is located in the main frame 1 and is used to pretreat the nascent fiber, and the conveying component 3 is located in the main frame 1 and is used to transfer the nascent fiber.

[0028] Specifically, the main frame 1 is constructed by welding stainless steel plates. The main frame 1 has a heating cavity with an inlet and an outlet. The heating component is located inside the heating cavity, and the conveying component 3 is installed in the upper area of ​​the heating cavity inside the main frame 1.

[0029] Understandably, the nascent fibers are transferred into the heating chamber by the conveying component 3. The heating component heats and dries the nascent fibers, thereby evaporating the free water inside the nascent fibers. The heated and dried nascent fibers are discharged from the heating chamber through the conveying component 3 and transported to the sintering kiln.

[0030] The polycrystalline alumina fiber drying pretreatment equipment of this application pre-dries the nascent fibers, thereby allowing the free water inside the nascent fibers to evaporate, ensuring the strength and related conditions of the nascent fibers, and thus ensuring uniform fiber quality and improving product qualification rate.

[0031] In some embodiments, the main frame 1 is provided with an observation window 4 at the top.

[0032] Specifically, the top of the main frame 1 is provided with multiple observation ports spaced apart, and each observation port is equipped with an observation window 4.

[0033] Understandably, by setting up observation window 4, it is convenient for staff to inspect the condition inside the heating chamber during the production process and to judge the state of the nascent fibers. In case of any abnormality, the machine can be stopped in time to avoid potential safety hazards.

[0034] In some embodiments, the heating assembly includes a plurality of heating elements 2, which are spaced apart on the sidewalls and bottom of the main frame 1.

[0035] Specifically, the heating element 2 can be a silicone heating element, and multiple heating elements 2 are evenly spaced on the side wall of the main frame 1. It is understood that in some other embodiments, the heating element 2 can also be a heating wire or other heating device.

[0036] Understandably, the main function of the heating element 2 is to regulate the temperature inside the heating chamber, so that the free water inside the nascent fibers can fully evaporate when they are in the heating chamber. Multiple heating elements 2 are evenly distributed on the side wall of the main frame 1, so that the heating elements 2 can radiate throughout the heating chamber and avoid the existence of heating dead zones.

[0037] Based on the above embodiments, each heating element 2 has an independent switch, which can adjust the output power of the corresponding heating element 2.

[0038] Understandably, the output power of each heating element 2 can be adjusted via an independent switch, allowing for real-time temperature regulation of corresponding locations within the heating chamber during pretreatment. This prevents excessively high or low temperatures in localized areas of the heating chamber, thereby improving pretreatment efficiency. Furthermore, when drying nascent fibers of varying thicknesses, these fibers are placed separately in different areas of the heating chamber. The temperature of the corresponding heating element 2 is adjusted via an independent switch, resulting in different temperatures in different areas of the heating chamber. This adapts to the drying pretreatment of nascent fibers of varying thicknesses, accommodating different processes and specifications of polycrystalline alumina, thus increasing production capacity while ensuring fiber quality.

[0039] In some embodiments, the conveying assembly 3 includes a drive member, a drive roller, and a mesh belt. Multiple drive rollers are spaced apart on the main frame 1. The drive rollers are rotatably connected to the main frame 1. The drive member is mounted on the main frame 1, and its output end is connected to one of the drive rollers. The mesh belt is sleeved on the drive roller.

[0040] Specifically, the driving component can be a servo motor, which is fixedly installed inside the main frame 1. The driving rollers can be rubber-coated rollers, and multiple driving rollers are evenly distributed on the side wall of the driving component along the horizontal direction. Each driving roller is rotatably engaged with the main frame 1 and can extend into the heating chamber. The output end of the driving component is fixedly connected to one of the driving rollers, making that driving roller the active roller and the other driving rollers the passive rollers. The mesh belt is made of polytetrafluoroethylene, which has flame-retardant properties. The mesh diameter of the mesh belt can be 4 mm. The mesh belt is located inside the heating chamber and is sleeved on the driving rollers.

[0041] Understandably, the drive motor drives the active roller to rotate, which in turn drives the mesh belt to rotate through friction. The mesh belt, in turn, drives the driven roller to rotate under the influence of friction. The nascent fibers are placed on the mesh belt, allowing it to move them from the inlet to the outlet of the heating chamber. Because the mesh belt has openings, the contact area between the nascent fibers and the air is increased, thus ensuring that the heat generated by the heating element 2 within the heating chamber is evenly distributed onto the nascent fibers.

[0042] In some embodiments, the main frame 1 is also provided with a temperature and humidity monitoring probe 5. There are multiple temperature and humidity monitoring probes 5, which are distributed in the upper space of the main frame 1.

[0043] Specifically, multiple temperature and humidity monitoring probes 5 are divided into three groups. The three groups of temperature and humidity monitoring probes 5 are distributed vertically and horizontally in the upper space of the heating cavity. The temperature and humidity monitoring probes 5 in each group are evenly distributed along the horizontal direction.

[0044] It is understandable that the above-mentioned temperature and humidity monitoring probe 5 can effectively and comprehensively cover the upper space of the entire heating chamber, thereby accurately reflecting the changes in temperature and humidity inside the heating chamber, so as to ensure that the nascent fibers can be pre-treated within a suitable temperature and humidity range.

[0045] In some embodiments, the polycrystalline alumina fiber drying pretreatment equipment is further provided with an exhaust assembly 6. The exhaust assembly 6 includes an exhaust branch pipe 62, an exhaust main pipe 61, and a fan. The exhaust main pipe 61 is located above the main frame 1, and a plurality of exhaust branch pipes 62 are located between the exhaust main pipe 61 and the main frame 1. One end of the exhaust branch pipe 62 is connected to the heating chamber of the main frame 1, and the other end is connected to the exhaust main pipe 61. Each exhaust branch pipe 62 is provided with a fan.

[0046] Specifically, the exhaust main pipe 61 has an air outlet and is located above the main frame 1. Multiple exhaust branch pipes 62 are distributed between the main frame 1 and the exhaust main pipe 61. The exhaust branch pipes 62 are used to connect the heating chamber and the exhaust main pipe 61. The number of exhaust branch pipes 62 is the same as the number of heating elements 2. The heating chamber can be divided into multiple different areas according to the horizontal direction. Each area has a heating element 2 and an exhaust branch pipe 62. The fan in each exhaust branch pipe 62 can operate independently without interfering with each other.

[0047] Understandably, after the internal water of the nascent fibers evaporates, it forms water vapor and distributes within the heating chamber. Continuous ventilation by the fan creates negative pressure within the exhaust duct 61, allowing the water vapor-laden air in the heating chamber to enter the exhaust duct 61 through the exhaust branch pipe 62 and exit through the exhaust duct 61's outlet, thus preventing excessive humidity within the heating chamber. When pre-treating nascent fibers of different thicknesses, these fibers are located in different zones. By adjusting the heating elements 2 and the fan in the corresponding zones, the temperature and humidity in each zone are adjusted to meet the pre-treatment environmental requirements of the nascent fibers within that zone, thereby enabling the pre-treatment of nascent fibers of varying thicknesses.

[0048] In some embodiments, the polycrystalline alumina fiber drying pretreatment equipment is further provided with a control component 7, which includes a control box and a control board. The control board is located inside the control box and is electrically connected to the heating component, the conveying component 3, the temperature and humidity monitoring probe 5, and the exhaust component 6, respectively.

[0049] Specifically, the control box is separated from the main frame 1. The control box can be installed next to the main frame 1, and the control board is installed inside the control box. The control board is electrically connected to the independent switch of the heating element 2 via wires, the drive unit via wires, the temperature and humidity monitoring probe 5 via wires, and the fan via wires. The temperature and humidity monitoring probe 5 and the fan are controlled by a PLC.

[0050] Understandably, by controlling the independent switch of heating element 2 via the control board, the output power and temperature of heating element 2 can be remotely set. Similarly, by controlling the output power of the drive unit via the control board, the conveyor speed of the conveyor belt can be remotely set. Temperature and humidity monitoring probe 5 transmits temperature and humidity data to the control board, which then controls the start and stop of the fan based on the data, ensuring that the humidity within the heating chamber remains within the set range. When the humidity at the monitoring point exceeds the upper limit of the set range, the fan starts and promptly discharges water vapor from the heating chamber, maintaining stable humidity. Control component 7 plays a parameter adjustment role, ensuring that the nascent fibers are fully volatilized within a reasonable parameter range, achieving relatively good quality.

[0051] In some embodiments, a heat-resistant pad is provided on the inner sidewall of the main frame 1.

[0052] Specifically, the heat-resistant gasket can be a silicone gasket, which has good temperature resistance and flame retardant properties.

[0053] It is understandable that heat-resistant gaskets are installed on the inner wall of the main frame 1 to prevent the stainless steel sheet from corroding and falling off, thus contaminating the nascent fibers.

[0054] In some embodiments, the outer wall of the main frame 1 is provided with a heat insulation layer, and the ground of the main frame 1 is paved with a heat insulation layer.

[0055] Specifically, the insulation layer can be flame-retardant polyurethane, which is adhered to the outer side wall of the main frame 1. The heat insulation layer can be aluminum silicate fiber cotton. The insulation layer and the heat insulation layer can prevent heat from being dissipated through the side wall or bottom of the main frame 1, thereby ensuring the heat insulation effect of the heating cavity and reducing energy consumption.

[0056] In summary, the polycrystalline alumina fiber drying and pretreatment equipment of this application can pretreat nascent fibers, ensuring good strength and related conditions before they enter the furnace, guaranteeing uniform and excellent fiber quality, improving product qualification rate, and thus increasing production capacity. Furthermore, this polycrystalline alumina fiber drying and pretreatment equipment can process nascent fibers of different thicknesses, maximizing production capacity while ensuring fiber quality, and is adaptable to different processes and specifications of polycrystalline alumina. The polycrystalline alumina fiber drying and pretreatment equipment of this application exhibits strong stability, high control precision, simplified process, simple procedures, and is safe, reliable, and low-cost.

[0057] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0058] The above provides a detailed description of the polycrystalline alumina fiber drying and pretreatment equipment provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are merely for the purpose of helping to understand the solution and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A pretreatment device for drying polycrystalline alumina fibers, characterized in that, include: The main frame (1) has a heating cavity inside; A heating assembly is disposed on the main frame (1) and is used for pre-treating nascent fibers; A conveying component (3) is disposed on the main frame (1) and is used to transfer nascent fibers.

2. The polycrystalline alumina fiber drying and pretreatment equipment according to claim 1, characterized in that, The main frame (1) has an observation window (4) at the top.

3. The polycrystalline alumina fiber drying and pretreatment equipment according to claim 2, characterized in that, The heating assembly includes multiple heating elements (2), which are spaced apart on the sidewalls and bottom of the main frame (1).

4. The polycrystalline alumina fiber drying and pretreatment equipment according to claim 3, characterized in that, Each of the heating elements (2) has an independent switch that can adjust the output power of the corresponding heating element (2).

5. The polycrystalline alumina fiber drying and pretreatment equipment according to claim 4, characterized in that, The conveying assembly (3) includes a drive component, a drive roller and a mesh belt. Multiple drive rollers are spaced apart on the main frame (1). The drive rollers are rotatably connected to the main frame (1). The drive component is installed on the main frame (1) and its output end is connected to one of the drive rollers. The mesh belt is sleeved on the drive roller.

6. The polycrystalline alumina fiber drying and pretreatment equipment according to claim 5, characterized in that, The main frame (1) is also provided with a temperature and humidity monitoring probe (5), and there are multiple temperature and humidity monitoring probes (5) distributed in the upper space of the main frame (1).

7. The polycrystalline alumina fiber drying and pretreatment equipment according to claim 6, characterized in that, An exhaust assembly (6) is also provided, which includes an exhaust branch pipe (62), an exhaust main pipe (61) and a fan. The exhaust main pipe (61) is located above the main frame (1), and a plurality of exhaust branch pipes (62) are located between the exhaust main pipe (61) and the main frame (1). One end of the exhaust branch pipe (62) is connected to the heating cavity of the main frame (1), and the other end is connected to the exhaust main pipe (61). Each exhaust branch pipe (62) is equipped with a fan.

8. The polycrystalline alumina fiber drying and pretreatment equipment according to claim 7, characterized in that, A control component (7) is also provided, which includes a control box and a control board. The control board is located in the control box and is electrically connected to the heating component, the conveying component (3), the temperature and humidity monitoring probe (5), and the exhaust component (6).

9. The polycrystalline alumina fiber drying and pretreatment equipment according to claim 1, characterized in that, The inner wall of the main frame (1) is provided with a heat-resistant pad.

10. The polycrystalline alumina fiber drying and pretreatment equipment according to claim 1, characterized in that, The outer wall of the main frame (1) is provided with a heat insulation layer, and the bottom surface of the main frame (1) is provided with a heat insulation layer.

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