Alumina fiber high-thickness block production equipment and production method

Abstract

The application provides an alumina fiber high-thickness block production device and method, and relates to the technical field of refractory fiber material equipment. The alumina fiber high-thickness block production device comprises a conveying device, a unwinding device, an oil injection device and a needling device, the number of the unwinding device, the oil injection device and the needling device is at least two, and a single unwinding device, a single oil injection device and a single needling device are arranged above the conveying device in sequence. The alumina fiber high-thickness block production scheme provided by the application can automatically and integrally form continuous alumina fiber high-thickness tissues, greatly simplifies the production process of the alumina fiber high-thickness block, and improves the production efficiency.

Description

Technical Field

[0001] This application relates to the field of refractory fiber material equipment technology, specifically to a production equipment and method for producing high-thickness alumina fiber blocks. Background Technology

[0002] Refractory fiber products possess advantages such as high temperature resistance, light weight, low thermal conductivity, low heat capacity, and good seismic performance. Using refractory fibers can save 20% to 40% of energy compared to using traditional castables and refractory bricks. High-thickness refractory fiber blocks are a type of fiber furnace lining product with regular dimensions that can be directly anchored. They possess excellent chemical stability, thermal stability, and resilience, and are widely used in petrochemical, metallurgical, ceramic, glass, machinery, and chemical kilns. However, for some high-temperature kilns operating at temperatures close to 1350-1500℃, traditional ceramic fiber high-thickness blocks cannot meet the requirements due to severe crystallization and powdering. The most ideal material is alumina fiber high-thickness blocks. However, traditional methods can only form alumina fiber blankets 6-30mm thick, and cannot directly form high-thickness structures. It requires folding the fiber blankets into U-shaped structures and stacking them together, and also installing anchors and protective plates to finally form a structure of a certain thickness. This process is not only inefficient but also lacks automation, making it unable to meet the ever-increasing production demands. Summary of the Invention

[0003] In view of this, the embodiments of this specification provide a production equipment and method for producing high-thickness alumina fiber blocks, which can automatically and integrally form a continuous high-thickness alumina fiber structure, greatly simplifying the production process of high-thickness alumina fiber blocks and improving production efficiency.

[0004] On the one hand, a high-thickness alumina fiber block production equipment is provided, including a conveying device, an unwinding device, an oil spraying device, and a needle punching device. The number of the unwinding device, the oil spraying device, and the needle punching device is at least two, and a single unwinding device, a single oil spraying device, and a single needle punching device are arranged sequentially above the conveying device.

[0005] In some embodiments, the single unwinding device, the single oil spraying device, and the single needle punching device are arranged sequentially along the conveying direction of the unwinding device.

[0006] In some embodiments, there are predetermined spacings between adjacent unwinding devices, between adjacent spraying devices, and between adjacent spraying devices.

[0007] In some embodiments, the conveying device includes a conveyor belt.

[0008] In some embodiments, the conveying speed of the conveying device is 0.15 m / s to 0.4 m / s.

[0009] In some embodiments, the conveying speed of the conveying device is 0.3 m / s.

[0010] In some embodiments, the unwinding device is a double-head unwinding machine, and / or the first height distance between the unwinding device and the conveying device is 2m.

[0011] In some embodiments, the unwinding speed of the unwinding device is 0.1 m / s to 0.3 m / s.

[0012] In some embodiments, the unwinding speed of the unwinding device is 0.2 m / s.

[0013] In some embodiments, the oil spraying device uses fluoroether oil for oiling, and / or the second height distance between the oil spraying device and the conveying device is 0.2m.

[0014] In some embodiments, the flow rate of the fuel injection device is 0.5 L / min to 2 L / min.

[0015] In some embodiments, the flow rate of the fuel injection device is 1 L / min.

[0016] In some embodiments, the needling method of the needling device is vertical needling.

[0017] In some embodiments, the needle density of the acupuncture device is 20 needles / cm. 2 ~35 stitches / cm 2 .

[0018] In some embodiments, the needle density of the acupuncture device is 30 needles / cm. 2 .

[0019] In some embodiments, the acupuncture frequency of the acupuncture device is 10 times / min to 20 times / min.

[0020] In some embodiments, the acupuncture frequency of the acupuncture device is 20 times / min.

[0021] On the other hand, a method for producing the alumina fiber high-thickness block production equipment according to any of the above embodiments includes:

[0022] The first unwinding device in the conveying direction of the conveying device performs the unwinding operation of alumina fiber raw material;

[0023] The oil is transported to the oil spraying device via the conveying device for oil spraying.

[0024] The needle is transported to the acupuncture device via the conveying device for acupuncture.

[0025] The material is conveyed by the conveying device to the next unwinding device and then stacked again by the unwinding operation.

[0026] The oil is conveyed to the next oil spraying device via the conveying device for oil spraying.

[0027] The needle is transported to the next needle-punching device via the conveying device for needle-punching operation.

[0028] Repeat the oil spraying operation, oil spraying operation, and needle punching operation until the oil flows through the last needle punching device to obtain a high-thickness block of alumina fiber of predetermined thickness.

[0029] In some embodiments, the number of unwinding devices, the number of oil spraying devices, and the number of needle punching devices are set according to a predetermined thickness of the alumina fiber thick block.

[0030] In some embodiments, the length of the conveying device is set according to a predetermined thickness of the alumina fiber thick block or the number of unwinding devices, the number of oil spraying devices, and the number of needle punching devices.

[0031] In some embodiments, the method further includes:

[0032] The obtained alumina fiber thick block is then cut into smaller pieces.

[0033] In some embodiments, the alumina fiber raw material is an alumina fiber mesh, and / or the continuous alumina fibers in the alumina fiber raw material are prepared by a gel-gel method, a centrifugal spinning method, or an electrospinning process.

[0034] Compared with the prior art, the beneficial effects that at least one technical solution adopted in the embodiments of this specification can achieve include at least:

[0035] By using a conveying device and multiple sets of unwinding, oil spraying, and needle punching devices, the alumina fiber raw material can automatically move to the next unwinding device after one unwinding, oil spraying, and needle punching process. Another layer is then stacked on the surface of the first layer of cotton web, and after oil spraying and needle punching, it can be continuously stacked. The number of stacked layers and the settings of the unwinding, oil spraying, and needle punching devices are arranged according to the required thickness. Compared with traditional methods that cannot automatically and efficiently generate high-thickness structures, the alumina fiber high-thickness block production equipment and method provided in this application can automatically and integrally form continuous alumina fiber high-thickness structures (e.g., thickness up to 2m), and can be cut into blocks of different lengths according to actual needs. This greatly simplifies the production process of alumina fiber high-thickness blocks, improves production efficiency, and can meet the production needs of industrial-grade alumina fiber high-thickness blocks. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the 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.

[0037] Figure 1 This is a schematic diagram of the structure of the alumina fiber high-thickness block production equipment provided in the embodiments of this application;

[0038] Figure 2 This is a schematic diagram of the production method of the alumina fiber thick block production equipment provided in the embodiments of this application. Detailed Implementation

[0039] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0040] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0042] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0043] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0044] Figure 1 This is a schematic diagram of the structure of the alumina fiber high-thickness block production equipment provided in the embodiments of this application. Figure 1 As shown, the alumina fiber high-thickness block production equipment includes a conveying device 1, an unwinding device 2, an oil spraying device 3, and a needle punching device 4. The unwinding device 2 is used to unwind the alumina fiber raw material A wound on it. Then, the alumina fiber raw material A falls into the conveying device 1 and is conveyed by the conveying device 1 to the oil spraying device 3 (which can be a corresponding position that is convenient for the oil spraying device 3 to spray oil) for oil spraying. After the oil spraying is completed, it is transferred by the conveying device 1 to the needle punching device 4 (similarly, it can be a corresponding position that is convenient for the needle punching device 4 to needle) for needle punching, thereby completing the first processing step of the alumina fiber raw material A.

[0045] Since there are at least two unwinding devices 2, oil spraying devices 3, and needle punching devices 4, the number of these devices can be multiple depending on the desired thickness of the high-thickness alumina fiber block B. This allows for a second processing step after the first stage, where the material is unwound, oiled, and needled repeatedly via the conveyor 1, the next unwinding device 2, the next oil spraying device 3, and the next needle punching device 4. This process achieves multi-layer stacking of alumina fibers until the last needle punching device 4 completes its processing, resulting in the desired thickness of the high-thickness alumina fiber block B product. Specifically, each unwinding device 2, each oil spraying device 3, and each needle punching device 4 is arranged sequentially above the conveyor 1, and can be positioned at appropriate locations above the conveyor 1. This ensures that each unwinding device 2, each oil spraying device 3, and each needle punching device 4 can effectively perform its corresponding unwinding, oil spraying, or needle punching function.

[0046] In some embodiments, a single unwinding device 2, a single oil spraying device 3, and a single needle punching device 4 are arranged sequentially along the conveying direction of the unwinding device 2.

[0047] In some embodiments, there are predetermined distances between adjacent unwinding devices 2, adjacent oil spraying devices 3, and adjacent oil spraying devices 4. The specific value of the predetermined distance can be set according to different needs and is not particularly limited thereto.

[0048] In some embodiments, the length of the conveying device 1 can be set according to the desired thickness of the alumina fiber thick block B, and / or the number of unwinding devices 2, spraying devices 3, and needle punching devices 4, and / or the predetermined spacing between adjacent unwinding devices 2, adjacent spraying devices 3, and adjacent spraying devices 4. In some embodiments, the number of stacked layers can be set according to the desired thickness of the alumina fiber thick block B, and the number of unwinding devices 2, spraying devices 3, and needle punching devices 4 can be set according to the number of stacked layers.

[0049] In some embodiments, the conveying device 1 includes a conveyor belt, i.e., the conveying function is performed by the conveyor belt. In some embodiments, the conveying speed of the conveying device 1 is set to 0.15 m / s to 0.4 m / s. In some embodiments, the conveying speed of the conveying device is preferably set to 0.3 m / s.

[0050] In some embodiments, the unwinding device 2 is a double-headed unwinding machine. In some embodiments, the first height distance between the unwinding device 2 and the conveying device 1 is 2m, that is, the unwinding device 2 can be located 2m above the conveying device 1, for example, directly above it. In some embodiments, the unwinding speed of the unwinding device 2 is set to 0.1m / s to 0.3m / s. In some embodiments, the unwinding speed of the unwinding device is preferably set to 0.2m / s.

[0051] In some embodiments, the oil spraying device 3 uses fluoroether oil for oiling. In some embodiments, the second height distance between the oil spraying device 3 and the conveying device 1 is 0.2m, that is, the oil spraying device 3 is located 0.2m above the conveying device 1. In some embodiments, the flow rate of the oil spraying device 3 is set to 0.5L / min to 2L / min. In some embodiments, the flow rate of the oil spraying device is preferably set to 1L / min.

[0052] In some embodiments, the needling method of the needling device 4 is vertical needling. In some embodiments, the needling density of the needling device 4 is set to 20 needles / cm. 2 ~35 stitches / cm 2 In some embodiments, the acupuncture density of the acupuncture device 4 is preferably set to 30 needles / cm. 2 In some embodiments, the acupuncture frequency of the acupuncture device 4 is set to 10 to 20 times per minute. In some embodiments, the acupuncture frequency of the acupuncture device 4 is preferably set to 20 times per minute.

[0053] Figure 2 This is a schematic diagram of the production method of the alumina fiber thick block production equipment provided in the embodiments of this application.

[0054] like Figure 2As shown, the production method for producing high-thickness alumina fiber modules using the alumina fiber high-thickness module production equipment described in any of the above embodiments may include the following steps:

[0055] S1. The first unwinding device 2 in the conveying direction of the conveying device 1 performs the unwinding operation of alumina fiber raw material A;

[0056] S2. The oil is conveyed to the oil spraying device 3 via the conveying device 1 for oil spraying operation;

[0057] S3. The needle is transported to the needle puncture device 4 via the conveying device 1 for needle puncture operation;

[0058] S4. The material is conveyed to the next unwinding device 2 via the conveying device 1, and then stacked again by the unwinding operation.

[0059] S5. The oil is conveyed to the next oil injection device 3 via the conveying device 1 for oil injection operation;

[0060] S6. The needle is transported to the next needle-punching device 4 via the conveying device 1 for needle-punching operation;

[0061] S7. Repeat the oil spraying operation, oil spraying operation and needle punching operation until the oil flows through the last needle punching device 4 to obtain alumina fiber high-thickness block B of predetermined thickness.

[0062] In some embodiments, the number of unwinding devices 2, the number of oil spraying devices 3, and the number of needle punching devices 4 are set according to the predetermined thickness of the alumina fiber thick block B. In some embodiments, the length of the conveying device 1 is set according to the predetermined thickness of the alumina fiber thick block B or the number of unwinding devices 2, the number of oil spraying devices 3, and the number of needle punching devices 4.

[0063] In some embodiments, after obtaining alumina fiber high-thickness block B of a predetermined thickness, the obtained alumina fiber high-thickness block B can be cut into smaller blocks. In some embodiments, alumina fiber raw material A is an alumina fiber web. In some embodiments, the continuous alumina fibers in alumina fiber raw material A are prepared by a gel-gel method, centrifugal spinning method, or electrospinning process.

[0064] The production equipment and method for producing high-thickness alumina fiber modules provided in this application will be further described below with reference to specific embodiments. It should be noted that the embodiments here are merely examples, and can be implemented in any other feasible manner without departing from the inventive concept of this application.

[0065] Example 1

[0066] In this embodiment, the unwinding speed of the unwinding device 2 is 0.1 m / s, and it is located 2 m above the conveying device 1. The unwinding device 2 is a double-headed unwinding machine. The conveying speed of the conveying device 1 is 0.15 m / s. The oil spraying device 3 is located 0.2 m above the alumina fiber mesh cotton quilt on the conveying device 1, and the flow rate (flow rate of fluoroether oil) of the oil spraying device 3 is 0.5 L / min. The needle punching density of the needle punching device 4 is 20 needles / cm. 2 After needle punching, the cotton web is conveyed by conveyor 1 to the next unwinding device 2, where another layer is stacked on the surface of the cotton web. After oil spraying, it is needle punched again, and the number of stacking layers is set according to the required thickness. The desired thickness of the alumina fiber high-thickness block is set to 150mm. The unwinding device 2, oil spraying device 3, and needle punching device 4 are set according to the thickness. After the product comes off the conveyor 1, it is cut to obtain a finished product with a bulk density of 253kg / cm³. 3 .

[0067] Testing showed that the bulk density of the alumina fiber thick block obtained in this embodiment was 253 kg / cm³. 3 The slag ball content (greater than 70 mesh) is 0.3%, the thermal conductivity at an average temperature of 500℃ is 0.139W / (m·K), the permanent linear shrinkage upon heating (1400℃×24h) is 2.3%, the airflow velocity it can withstand is 36m / s, and the operating temperature is 1400℃.

[0068] Example 2

[0069] In this embodiment, the unwinding speed of the unwinding device 1 is 0.2 m / s, and it is located 2 m above the conveying device 1; the conveying speed of the conveying device 1 is 0.3 m / s; the oil spraying device 3 is located 0.2 m above the fiber web cotton batting on the conveying device 1, and the flow rate (flow rate of fluoroether oil) of the oil spraying device 3 is 1 L / min; the needle punching density of the needle punching device 4 is 30 needles / cm. 2 After needle punching, the cotton web is conveyed by conveyor 1 to the next unwinding device 2, where another layer is stacked on the surface of the cotton web. After oil spraying, it is needle punched again. The number of stacking layers is set according to the required thickness. The desired thickness of the alumina fiber high-thickness block is set to 150mm. Based on the thickness and the number of stacking layers, the unwinding device 2, oil spraying device 3, and needle punching device 4 are set. After the product comes off the conveyor, it is cut to obtain a finished product with a density of 250kg / cm³. 3 .

[0070] Testing showed that the bulk density of the alumina fiber thick block obtained in this embodiment was 250 kg / cm³. 3The slag ball content (greater than 70 mesh) is 0.3%, the thermal conductivity at an average temperature of 500℃ is 0.104W / (m·K), the permanent linear shrinkage upon heating (1400℃×24h) is 2.1%, the airflow velocity it can withstand is 50m / s, and the operating temperature is 1600℃.

[0071] Example 3

[0072] In this embodiment, the unwinding speed of the unwinding device 1 is 0.3 m / s, and it is located 2 m above the conveying device; the conveying speed of the conveying device 1 is 0.4 m / s; the oil spraying device 3 is located 0.2 m above the fiber web cotton batting on the conveying device 1, and the flow rate (flow rate of fluoroether oil) of the oil spraying device 3 is 2 L / min; the needle punching density of the needle punching device 4 is 35 needles / cm. 2 The needle-punched cotton web is conveyed by conveyor 1 to the next unwinding device 1, where another layer is stacked on the surface of the cotton web. After oiling, it is needle-punched again, with the number of stacking layers set according to the required thickness. The thickness of the high-thickness alumina fiber block is set to 150mm. The unwinding device 2, oiling device 3, and needle-punching device 4 are set according to the thickness. After the product comes off conveyor 1, it is cut to obtain a finished product with a density of 246kg / cm³. 3 .

[0073] Testing showed that the bulk density of the alumina fiber thick block obtained in this embodiment was 246 kg / cm³. 3 The slag ball content (greater than 70 mesh) is 0.3%, the thermal conductivity at an average temperature of 500℃ is 0.125W / (m·K), the permanent linear shrinkage upon heating (1400℃×24h) is 2.45%, the airflow velocity it can withstand is 46m / s, and the operating temperature is 1500℃.

[0074] Compare with Example 1

[0075] Commercially available ceramic fiber monolithic modules of the same specifications as in Example 2 were used, with a thickness of 150 mm and a density of 240 kg / cm³. 3 The slag ball content (greater than 70 mesh) was measured to be 4.5%, the thermal conductivity at an average temperature of 500℃ was 0.12W / (m·K), the permanent linear shrinkage upon heating (1100℃×24h) was 2.9%, the airflow velocity it could withstand was 41m / s, and the operating temperature was 1200℃.

[0076] Compare with Example 2

[0077] The speed of the unwinding device 2 in Example 2 is adjusted to 1m / s to 2m / s, while other aspects remain the same as in Example 2.

[0078] Test results showed that the alumina fiber thick blocks were not completely needled, making them prone to delamination and fiber detachment.

[0079] Compare with Example 3

[0080] The speed of the fuel injection device 3 in Example 2 was adjusted to 0.5 L / min, while other aspects remained the same as in Example 2.

[0081] Test results showed that the alumina fiber thick block needle punching effect was poor in the needle punching device 4, and the fiber was prone to breakage.

[0082] Compare with Example 4

[0083] The speed of the fuel injection device 3 in Example 2 was adjusted to 3L / min, while other aspects remained the same as in Example 2.

[0084] Test results showed that the fibers adhered severely during the acupuncture process, making the acupuncture process difficult.

[0085] Compare with Example 5

[0086] The needle density in Example 2 was adjusted to 10 needles / cm. 2 ~20 stitches / cm 2 Otherwise, it remains the same as in Example 2.

[0087] Test results showed that the alumina fiber thick blocks were not completely needled, which easily led to delamination and fiber detachment.

[0088] In summary, the alumina fiber thick block production equipment and method provided in this application have at least the following beneficial effects:

[0089] (1) By using the conveying device 1 and multiple unwinding devices 2, oil spraying devices 3 and needle punching devices 4, the alumina fiber raw material A can automatically move to the next unwinding device 2 after one unwinding, oil spraying and needle punching. Another layer is superimposed on the surface of the first layer of cotton web, and after oil spraying and needle punching, it can be continuously superimposed. The number of stacked layers and the setting of unwinding device 2, oil spraying device 3 and needle punching device 4 are arranged according to the required thickness. Compared with the traditional method that cannot automatically and efficiently generate high-thickness structures, the alumina fiber high-thickness block production equipment and method provided in this application can automatically and integrally form a continuous alumina fiber high-thickness structure (for example, the thickness can be up to 2m), and can be cut into blocks of different lengths according to actual needs, which greatly simplifies the production process of alumina fiber high-thickness blocks, improves production efficiency, and can meet the production needs of industrial-grade alumina fiber high-thickness blocks.

[0090] (2) By adopting the process of spraying oil first and then needle punching, and using fluorinated ether oil to apply oil to the alumina cotton batting, the cohesion between fibers can be increased and the needle punching effect can be enhanced. This reduces the damage to the cotton batting caused by needle punching to a certain extent and improves the product quality.

[0091] (3) By setting specific needle punching methods and needle punching densities, it is possible to perform good needle punching on multi-layered alumina fiber web cotton quilts, so that the layers do not separate, thereby ensuring that high-quality alumina fiber thick blocks can be produced to meet production needs.

[0092] In this specification, the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for the product embodiments described later, since they correspond to the methods, the descriptions are relatively simple, and the relevant parts can be referred to the descriptions in the system embodiments.

[0093] Furthermore, this specification uses specific terms to describe embodiments thereof. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of this specification. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Moreover, certain features, structures, or characteristics in one or more embodiments of this specification can be appropriately combined.

[0094] Furthermore, unless expressly stated in the claims, the order of processing elements and sequences, the use of numbers and letters, or other names described in this specification are not intended to limit the order of the processes and methods described herein. Although various examples have been discussed in the foregoing disclosure of some embodiments of the invention that are currently considered useful, it should be understood that such details are for illustrative purposes only, and the appended claims are not limited to the disclosed embodiments; rather, the claims are intended to cover all modifications and equivalent combinations that conform to the spirit and scope of the embodiments described herein. For example, while the system components described above can be implemented by hardware devices, they can also be implemented solely by software solutions, such as installing the described system on existing processing devices or mobile devices.

[0095] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this specification. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this specification. Such modifications, improvements, and corrections are suggested in this specification and therefore remain within the spirit and scope of the exemplary embodiments described herein.

Claims

1. A production method for a high-thickness alumina fiber block production equipment, characterized in that, The alumina fiber high-thickness block production equipment includes a conveying device, an unwinding device, an oil spraying device, and a needle punching device. The number of the unwinding device, the oil spraying device, and the needle punching device is at least two, and a single unwinding device, a single oil spraying device, and a single needle punching device are arranged sequentially above the conveying device. The conveying speed of the conveying device is 0.15m / s to 0.4m / s; The unwinding speed of the unwinding device is 0.1 m / s to 0.3 m / s; The flow rate of the fuel injection device is 0.5 L / min ~ 2 L / min; The needle density of the acupuncture device is 20 needles / cm². 2 ~35 stitches / cm 2 ; The production method includes: The first unwinding device in the conveying direction of the conveying device performs the unwinding operation of alumina fiber raw material; The oil is transported to the oil spraying device via the conveying device for oil spraying. The needle is transported to the acupuncture device via the conveying device for acupuncture. The material is conveyed by the conveying device to the next unwinding device and then stacked again by the unwinding operation. The oil is conveyed to the next oil spraying device via the conveying device for oil spraying. The needle is transported to the next needle-punching device via the conveying device for needle-punching operation. Repeat the feeding, spraying, and needle punching operations until the material passes through the last needle punching device to obtain a high-thickness block of alumina fiber of a predetermined thickness.

2. The method according to claim 1, characterized in that, The number of unwinding devices, the number of oil spraying devices, and the number of needle punching devices are set according to the predetermined thickness of the alumina fiber thick block.

3. The method according to claim 2, characterized in that, The length of the conveying device is set according to the predetermined thickness of the alumina fiber thick block or the number of unwinding devices, the number of oil spraying devices, and the number of needle punching devices.

4. The method according to any one of claims 1-3, characterized in that, Also includes: The obtained alumina fiber thick block is then cut into smaller pieces.

5. The method according to any one of claims 1-3, characterized in that, The alumina fiber raw material is made of alumina fiber mesh, and / or the continuous alumina fibers in the alumina fiber raw material are prepared by gel-gel method, centrifugal spinning method or electrospinning process.

6. The method according to claim 1, characterized in that, The single unwinding device, the single oil spraying device, and the single needle punching device are arranged sequentially along the conveying direction of the unwinding device.

7. The method according to claim 1, characterized in that, There are predetermined intervals between adjacent unwinding devices, adjacent oil spraying devices, and adjacent needle punching devices.

8. The method according to claim 1, characterized in that, The conveying device includes a conveyor belt.

9. The method according to claim 1, characterized in that, The conveying speed of the conveying device is 0.3 m / s.

10. The method according to claim 1, characterized in that, The unwinding device is a double-head unwinding machine, and / or the first height distance between the unwinding device and the conveying device is 2m.

11. The method according to claim 1, characterized in that, The unwinding speed of the unwinding device is 0.2 m / s.

12. The method according to claim 1, characterized in that, The oil spraying device uses fluoroether oil for oiling, and / or the second height distance between the oil spraying device and the conveying device is 0.2m.

13. The method according to claim 1, characterized in that, The flow rate of the fuel injection device is 1 L / min.

14. The method according to claim 1, characterized in that, The needle-punching method of the needle-punching device is vertical needle-punching.

15. The method according to claim 1, characterized in that, The needle density of the acupuncture device is 30 needles / cm². 2 .

16. The method according to claim 1, characterized in that, The acupuncture frequency of the acupuncture device is 10 times / min to 20 times / min.

17. The method according to claim 16, characterized in that, The acupuncture frequency of the acupuncture device is 20 times / min.

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