Ceramic tube forming die

Abstract

The invention provides a ceramic tube forming die which comprises a first die and a second die which are symmetrically arranged, the cross section of the first die and the cross section of the second die in the radial direction are in a semi-ring shape, and the first die and the second die are folded to form a complete annular forming die; the first die and the second die each comprise a flange section, a linear section and a plug section which are sequentially arranged in the axis direction of the first die and the second die. Wherein the straight line section is of an integrally-formed structure, the length of the straight line section is not smaller than 2500mm, and suction filtration through holes which are densely and uniformly distributed are formed in a pipe body structure of the straight line section. According to the ceramic tube forming die, the linear section is of an integrally-formed structure, the suction filtration through holes are densely and evenly distributed, it can be guaranteed that ceramic tubes are evenly distributed and layered in the whole length direction, the quality defect occurring at weld joints of an existing splicing die is avoided, the forming quality of the ceramic filter tubes is effectively improved, and the production efficiency is improved. The performance requirements of industrial waste gas treatment can be better met.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of environmental protection equipment, and in particular to a ceramic pipe forming die. BACKGROUND

[0002] In the context of accelerating industrialization, industrial waste gas emission has become one of the main sources of environmental pollution. Harmful substances such as nitrogen oxides, sulfur dioxide and volatile organic compounds contained in waste gas not only seriously damage air quality and threaten human health, but also cause a series of environmental problems such as acid rain and photochemical smog. As a kind of high-efficiency and durable filter material, ceramic filter pipe plays a key role in industrial waste gas treatment. With the advantages of high temperature resistance, corrosion resistance, high strength, high filtration efficiency and long service life, it is widely used in waste gas treatment links of chemical industry, power, metallurgy, waste incineration and other industries. In the treatment of chemical waste gas, ceramic filter pipe can be used to filter dust particles and metal volatiles in waste gas, reducing environmental pollution; in the field of waste incineration, it can efficiently remove dust, nitrogen oxides and other pollutants in flue gas, helping to achieve clean emission.

[0003] In the context of large-scale industrial waste gas treatment, the performance and specifications of ceramic filter pipes are extremely demanding. From the performance point of view, ceramic filter pipes need to have excellent dust removal, denitration and denitrification functions to effectively deal with complex and diverse industrial waste gas components. In chemical waste gas, in addition to conventional dust particles, there may be various organic compounds and heavy metal vapors; in the coal-fired waste gas of the power industry, sulfur dioxide, nitrogen oxides and a large amount of fly ash dust are the main pollutants. Ceramic filter pipes must be able to operate stably in these complex environments, efficiently remove various pollutants and ensure that waste gas emission meets strict environmental protection standards. From the specification point of view, in order to meet the treatment needs of large-scale industrial waste gas, ceramic filter pipes usually need to have a larger length. In some large industrial waste gas treatment systems, such as large-scale thermal power plants and metallurgical plants, the waste gas treatment capacity is huge, and ceramic filter pipes need to have sufficient filtration area and treatment capacity. Research and practice show that ceramic filter pipes with a length of more than 2m can better adapt to the requirements of large-scale waste gas treatment, and they can increase the filtration area and prolong the contact time of waste gas and filter material, thereby achieving more efficient filtration and purification.

[0004] The preparation mold is a key factor in determining the quality and performance of ceramic filter tubes. Its design and manufacturing process is crucial. A high-quality preparation mold not only ensures the dimensional accuracy and shape accuracy of ceramic filter tubes, but also affects their internal microstructure, thereby determining their key indicators such as filtration performance, mechanical properties, and chemical stability. If the mold design is unreasonable or the manufacturing process has defects, it will lead to problems such as size deviation, surface defects, and uneven internal structure in ceramic filter tubes, which will significantly reduce the performance of ceramic filter tubes and make them unable to meet the stringent requirements of industrial waste gas treatment.

[0005] In the current preparation process of ceramic filter tubes, the forming mold mainly works in cooperation with the inner mold and the outer mold. The inner mold usually adopts the structure form of shaft parts, and its working principle is based on the centrifugal distribution technology. When the inner mold rotates at high speed, the ceramic fiber raw materials placed in it are evenly thrown to the inner wall of the mold under the action of centrifugal force. This centrifugal force makes the ceramic fiber raw materials gradually accumulate and distribute uniformly on the inner wall of the mold, laying a foundation for subsequent forming. The outer mold mainly undertakes the key task of vacuum filtration to assist the forming of ceramic filter tubes. By processing dense filtration holes on the mold wall and connecting vacuum equipment, a negative pressure environment can be formed inside the outer mold during the forming process. Under the action of this negative pressure, the water and excess gas in the ceramic fiber raw materials are quickly extracted, thereby accelerating the forming process of the ceramic filter tube and also helping to adjust the internal pore structure of the ceramic filter tube.

[0006] For long ceramic filter tubes (length more than 2m) that need to meet the demand of large-scale industrial waste gas treatment, the forming outer mold is usually processed in a splicing manner. This method generally divides the mold into two or more than three segments for splicing manufacturing. During processing, each segment of the mold needs to be precisely processed with dense filtration holes, and the density and distribution of these filtration holes directly affect the filtration effect and the quality of the final ceramic filter tube. During the forming process, maintaining negative pressure filtration is a key link to ensure the quality of the ceramic filter tube. By connecting the filtration holes of the outer mold with the vacuum equipment, a stable negative pressure field is formed inside the mold, so that the ceramic fiber raw materials can be further compacted and formed under the action of negative pressure after being distributed by centrifugal force. This negative pressure filtration not only removes the water and gas in the ceramic fiber raw materials, but also promotes the closer accumulation of ceramic particles, thereby ensuring that the material layering uniformity and porosity gradient of the ceramic tube meet the requirements.

[0007] In the manufacturing process of the spliced outer mold, due to the need to splice multiple molds, welds will inevitably be generated. The material structure of these weld areas is different from the original material structure of the mold body. During the welding process, high temperature will cause changes in the organizational structure of the metal near the weld, resulting in an increase in the density of the material. For outer molds with dense filter holes, the filter holes in the 5mm area of the weld are affected by this structural change, and the air permeability is greatly reduced. This is because the densification of the material at the weld causes the gas to pass through the filter holes to face greater resistance, and it cannot pass through as smoothly as in the normal mold area, resulting in poor or even extremely poor air permeability of the holes in this area.

[0008] Due to the air permeability problem of the spliced mold weld, during the forming process of the ceramic filter tube, the material distribution at the weld interface of the forming ceramic tube mold is poor, and the layering is poor. During the centrifugal distribution stage, when the ceramic fiber raw material is thrown to the inner wall of the mold under the action of centrifugal force, due to the poor air permeability of the weld, it cannot be effectively filtered in time, and the water and gas in this area are blocked. This leads to a different accumulation state of the ceramic fiber raw material in this area from other normal areas, resulting in uneven distribution of the ceramic fiber raw material. In the subsequent forming process, due to the residual water and gas, a uniform material layering structure cannot be formed, resulting in poor material layering of the ceramic tube.

[0009] When the air permeability problem is serious, it will also cause the ceramic tube to have the problem of regional layering disconnection. During the forming process, due to the almost impossible normal filtration at the weld, a large amount of water and gas in the ceramic fiber raw material remains, making the ceramic fiber raw material in this area unable to form effective structural strength. With the advancement of the forming process, under the action of stress, the weld interface is prone to regional layering disconnection. This disconnection problem will seriously damage the overall structural integrity of the ceramic tube, making it unable to withstand the pressure, temperature changes and gas scouring during the industrial waste gas treatment process, greatly reducing the service life and performance of the ceramic tube.

[0010] In summary, the current spliced outer mold for long ceramic filter tube preparation has many problems that seriously affect the quality of the ceramic filter tube. The adverse effects of the weld on the air permeability of the filter hole, as well as the resulting problems of material distribution and layering during the forming process of the ceramic tube, and even the problem of regional layering disconnection, make it difficult for the produced ceramic filter tube to meet the stringent requirements of large-scale industrial waste gas treatment. These problems not only reduce the filtering performance of the ceramic filter tube, but also greatly shorten its service life, increase the operating cost and maintenance difficulty of the industrial waste gas treatment system. In practical applications, the failure of the waste gas treatment system caused by the quality problems of the ceramic filter tube not only causes economic losses, but also may cause serious pollution to the environment, which is contrary to the original intention of industrial waste gas treatment. Therefore, it is urgent to develop a new ceramic filter tube forming mold that can effectively solve the above problems. SUMMARY

[0011] In view of this, the embodiments of the present application provide a ceramic tube forming mold to eliminate or improve one or more defects in the prior art.

[0012] The ceramic tube forming mold comprises a first mold and a second mold arranged symmetrically, the cross section of the first mold and the second mold in the radial direction is a half ring shape, and the first mold and the second mold are folded to form a complete ring forming mold; the first mold and the second mold each comprise a flange section, a straight section and a plug section arranged in sequence along the axis direction thereof; wherein the straight section is an integral forming structure, the length of the straight section is not less than 2500mm, and the pipe body structure of the straight section is provided with dense and uniformly distributed filter holes.

[0013] In some embodiments, the filter hole is provided as a tapered hole, the inner wall hole diameter of the tapered hole is greater than the outer wall hole diameter thereof; or, a chamfer structure is formed at the inner wall part of the filter hole.

[0014] In some embodiments, the first mold and the second mold comprise the pipe body structure and butt joint structures arranged on both sides of the pipe body structure, the butt joint structures on both sides respectively extend outward along the diameter direction at the two ends of the half ring of the pipe body structure; in the length direction of the pipe body structure, the butt joint structures are continuously arranged or arranged at intervals.

[0015] In some embodiments, the butt joint structure has a butt joint part; the butt joint part is provided as a plane, or the butt joint parts of the first mold and the second mold are mutually concave-convex matched.

[0016] In some embodiments, the first mold and the second mold further comprise a support seat, the support seat is arranged at the outer side position of the pipe body structure and / or the butt joint structure, and is fixedly connected with the pipe body structure and / or the butt joint structure.

[0017] In some embodiments, the support base comprises support blocks arranged respectively below the docking portions on both sides, the support blocks being fixedly connected with the docking portions; the support blocks and the pipe body structure have negative pressure suction filtering channels therebetween; the support blocks are arranged continuously or at intervals in the length direction of the pipe body structure.

[0018] In some embodiments, the support base comprises at least one support sheet arranged below the pipe body structure, the top of the support sheet having an arc-shaped support portion fixedly connected with the outer wall of the pipe body structure; the arc-shaped support portion is arranged in a continuous structure or an interval structure in the circumferential direction of the pipe body structure; when there are two or more support sheets, the support sheets are arranged at intervals in the length direction of the pipe body structure.

[0019] In some embodiments, the aperture of the suction filtering hole is not more than 1mm, and the edge distance between adjacent holes is not more than 1mm.

[0020] In some embodiments, at least the lower one of the first mold and the second mold is arranged in a split structure with the linear segment at the middle portion and the flange segment and the plug segment on both sides.

[0021] In some embodiments, the pipe body structure of the first mold and the second mold is made of 3 / 4H stainless steel.

[0022] In some embodiments, the thickness of the pipe body structure of the first mold and the second mold is 0.6mm.

[0023] In some embodiments, the inner wall of the pipe body structure is formed with a smooth surface having a roughness of not more than 0.8μm.

[0024] The ceramic pipe forming mold in the embodiments of the present application arranges the linear segment in an integral forming structure, and the suction filtering holes are densely and uniformly distributed, which can ensure that the ceramic pipe is uniformly distributed and has consistent layers in the entire length direction, avoids the quality defects at the welding seams of the existing spliced molds, effectively improves the forming quality of the ceramic filter pipe, and makes it better meet the performance requirements of industrial waste gas treatment.

[0025] Additional advantages, objects, and features of the application will be set forth in part by the description that follows, and will in part be apparent to those of ordinary skill in the art upon examination of the following or can be learned from practice of the application. The objectives and other advantages of the application can be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

[0026] Those skilled in the art will understand that the objects and advantages of the application can be realized and attained by means of the instrumentalities and combinations particularly pointed out in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application. The components in the drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the application. For purposes of clarity and understanding, it is to be understood that certain portions of the drawings can be exaggerated, and others omitted, in order to demonstrate certain aspects of the application over other components.

[0028] Figure 1 An exploded view of a ceramic tube forming mold in an embodiment of the present application.

[0029] Figure 2 A structural schematic view of a straight section of a ceramic tube forming mold in an embodiment of the present application.

[0030] Figure 3 A structural schematic view of a straight section of a ceramic tube forming mold in an embodiment of the present application.

[0031] Figure 4 A structural schematic view of a straight section of a ceramic tube forming mold in an embodiment of the present application.

[0032] Figure 5 A structural schematic view of a straight section of a ceramic tube forming mold in an embodiment of the present application.

[0033] Figure 6 is Figure 5 A cross-sectional view along A-A, where the A-A cross-section is within the support piece.

[0034] Figure 7 is Figure 5 A cross-sectional view along C-C, where the C-C cross-section is between two support pieces.

[0035] Figure 8 is Figure 7 An enlarged view of A in FIG.

[0036] Reference numerals: a, first mold; b, second mold; 1, flange section; 2, straight section; 3, plug section; 21, tube body structure; 211, suction hole; 22, butt joint structure; 23, support seat; 231, support block; 231-1, negative pressure suction passage; 232, support piece; 232-1, arc-shaped support portion. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be described in further detail below with reference to the embodiments and drawings. Herein, the illustrative embodiments of the present application and their descriptions are used to explain the present application but not to limit the present application.

[0038] It should be further noted that, in order to avoid the present application being obscured by unnecessary details, only the structures and / or processing steps closely related to the solutions according to the present application are shown in the drawings, and other details not closely related to the present application are omitted.

[0039] It should be emphasized that the term "comprises / comprising" as used herein is used to indicate the presence of a feature, element, step or component but does not preclude the presence or addition of one or more other features, elements, steps or components.

[0040] It should be further noted that, if not specifically stated, the term "connected" as used herein can not only mean direct connection but also indirect connection in the presence of an intermediate.

[0041] Hereinafter, embodiments of the present application will be described with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar components, or the same or similar steps.

[0042] The present application provides a ceramic tube forming mold, and it should be particularly noted that the ceramic tube forming mold according to the embodiments of the present application refers to a ceramic tube forming outer mold (hereinafter can also be referred to as a mold). As shown in the drawings, the open end of the ceramic tube is designed with a mounting flange for hoisting the ceramic tube from top to bottom; the other end of the ceramic tube is a closed plugging end which can be designed as a hemispherical structure, and the plugging end can be designed as a solid structure or with a filter hole. In actual use, the outside of the ceramic tube is high-pollution flue gas to be treated, and the high-pollution flue gas is treated into clean flue gas after passing through the pipe wall structure and is discharged from the inside of the ceramic tube. This part is prior art and will not be described here. Figure 2 As shown in the drawings, the ceramic tube forming mold comprises a first mold a and a second mold b which are symmetrically arranged, the cross section of the first mold a and the second mold b in the radial direction is in a semi-ring shape, and the first mold a and the second mold b are folded to form a complete ring-shaped forming mold for the outer contour forming of the ceramic tube.

[0043] Figure 1 Further, the structures of the first mold a and the second mold b can be the same, and each can comprise a flange section 1, a straight section 2 and a plug section 3 arranged in sequence along the axial direction thereof. The flange section 1 is arranged at one end of the straight section 2, as shown in the drawings.

[0044] Further, the structures of the first mold a and the second mold b can be the same, and each can comprise a flange section 1, a straight section 2 and a plug section 3 arranged in sequence along the axial direction thereof. The flange section 1 is arranged at one end of the straight section 2, as shown in the drawings. Figure 1 ​The left side shown, its main role is to form the flange part of ceramic tube, plug section 3 is located at the other end of the straight section 2, which can close the mold one end opening, with the flange section 1 together constitute a closed forming space. In the ceramic tube forming, plug section 3 can block the ceramic slurry from the mold one end overflow, cooperate with the straight section 2 on the filtration operation, make the ceramic slurry in the mold uniform distribution, guarantee the size accuracy and structural integrity of the formed ceramic tube.

[0045] Further, the straight section 2 is an integral forming structure, the length is not less than 2500mm, the length design can fully meet the large-scale industrial waste gas treatment needs of long ceramic filter tube (such as length more than 2m) forming demand. Optionally, combined with the flange section 1 and the plug section 3 at both ends, the total length of the mold can reach 3m, and 3m long ceramic tube can be manufactured, which can efficiently treat large-scale industrial waste gas.

[0046] Further, the straight section 2 is an integral forming structure, the length is not less than 2500mm, the length design can fully meet the large-scale industrial waste gas treatment needs of long ceramic filter tube (such as length more than 2m) forming demand. Optionally, combined with the flange section 1 and the plug section 3 at both ends, the total length of the mold can reach 3m, and 3m long ceramic tube can be manufactured, which can efficiently treat large-scale industrial waste gas. Figure 8 The filtration through hole 211 can realize stable negative pressure filtration during the ceramic tube forming process, ensure the uniformity of the ceramic tube material in the forming process and the porosity gradient, thereby effectively avoiding the poor air permeability, uneven distribution, layering defects and other problems caused by the welding seam of the existing spliced mold.

[0047] In the ceramic tube forming process, first, the first mold a and the second mold b are folded and fixed through the flange section 1 to form an annular mold cavity. The prepared ceramic slurry is injected into the inner mold (such as a centrifugal distribution shaft), and the filtration device is started to apply negative pressure to the inside of the mold through the filtration through hole 211 on the straight section 2. Under the action of negative pressure, the water in the ceramic slurry is extracted, and the ceramic particles are gradually deposited in the mold wall. Due to the integral forming of the straight section 2 and the dense and uniform distribution of the filtration through hole 211, the ceramic tube can be evenly distributed and layered in the entire length direction, avoiding the quality defects at the welding seam of the existing spliced mold, effectively improving the forming quality of the ceramic filter tube, and better meeting the performance requirements of industrial waste gas treatment.

[0048] The straight section of the ceramic tube forming mold in the embodiment adopts an integral structure, which can avoid the interference of the welding seam on the air permeability of the filtration hole, ensure the formation of a uniform and stable negative pressure field during the negative pressure filtration process, and thus guarantee the uniformity of the ceramic filter tube in the forming process, the uniformity of the material layering, and the rationality of the porosity gradient.

[0049] In some embodiments, as shown in Figure 1As shown, the ceramic tube forming mold can further include a closed shell outside the first mold a and the second mold b. The closed shell can further enhance the sealing when the mold is vacuumized, avoid external air from entering to affect the negative pressure filtration effect, and ensure that the ceramic slurry is formed in a stable negative pressure environment; the closed shell provides a stable external support structure for the first mold a and the second mold b, and through the mounting holes and fixing members provided on the closed shell, the mold can be fixed and installed with external equipment to ensure the stability of the mold during use; in addition, the closed shell can cooperate with the lifting mechanism to realize the lifting operation of the mold.

[0050] If the filtration through hole 211 adopts the conventional design of inner and outer diameters, the cloth fiber cotton used for auxiliary forming is easily adsorbed into the hole during the ceramic tube forming process, and the adsorbed fiber cotton will damage the surface structure of the ceramic tube during the demolding process, resulting in the phenomenon of peeling during demolding, which seriously affects the appearance quality and forming qualification rate of the ceramic tube.

[0051] In some embodiments, as shown in the drawings, Figure 8 As shown, the filtration through hole 211 is designed as a tapered hole, and the inner wall diameter of the tapered hole is larger than the outer wall diameter; or, the inner wall part of the filtration through hole 211 is formed with a chamfer structure. The present application designs the filtration through hole 211 as a tapered hole with a large inner wall diameter and a small outer wall diameter, or sets a chamfer structure at the outer wall part, which can effectively change the internal structure form of the filtration through hole 211. When the ceramic tube is demolded after forming, a separation interface with a narrow outer wall and a wide inner wall can be formed, and the inner wall (the surface adhering to the mold) of the wet ceramic tube can naturally slide outward along the hole wall due to the inclination angle of the tapered hole, avoiding the problem of adsorption of cloth fiber cotton into the hole and pulling the surface of the ceramic tube during demolding caused by the through-hole or the tapered hole with a small inner diameter and a large outer diameter, so that the demolding resistance is significantly reduced, the demolding smoothness is greatly improved, the demolding peeling problem is effectively avoided, and the forming quality and production efficiency of the ceramic tube are improved.

[0052] Optionally, if the filtration through hole 211 is designed as a tapered hole, the taper thereof can be set to 30-60°, such as 45°, which can greatly reduce the contact area and friction force between the ceramic tube and the hole wall. In the demolding process, the adhering surface of the wet ceramic tube to the tapered hole naturally separates along the taper, which can effectively avoid the problems of adsorption of cloth fiber cotton and demolding peeling caused by the through-hole.

[0053] In this embodiment, the large inner wall aperture (e.g. 0.81 mm) can increase the contact area between the ceramic slurry and the suction filter through hole 211, allowing the water to quickly penetrate into the hole; the small outer wall aperture can form a throttling effect, avoiding excessive dehydration of the local slurry caused by excessive negative pressure, and forming a dense layer. The 45° taper can make the airflow in the hole flow gradually, without sudden changes or dead angles. Combined with the dense distribution of the through holes, the suction filter pressure difference in the full length range of the 3m long tube body structure can be controlled within the set pressure range, ensuring the uniformity of the porosity gradient of the ceramic tube along the length direction, avoiding local porosity blockage affecting the flow of exhaust gas, and preventing excessive porosity from causing a decrease in filtration precision, thus meeting the dual requirements of high efficiency and low resistance in industrial exhaust gas treatment. Alternatively, the suction filter through hole 211 in the embodiment of the present application can be processed by special processing methods such as laser processing, electric spark processing or electrolytic processing, etc.

[0054] When processing such small necked taper holes, laser processing can precisely focus on the surface of the mold material with high energy density laser beams, causing the material to melt, vaporize and be removed instantaneously, thereby achieving the processing of the taper hole. During the processing, by precisely controlling the output power, pulse width, spot size and scanning path of the laser beam, the taper and aperture change of the taper hole can be accurately controlled.

[0055] Electric spark processing uses the principle of pulse discharge corrosion to make the tool electrode into the shape opposite to the target necked taper hole. In the insulation working fluid environment, a high-frequency pulse voltage is applied between the tool electrode and the mold workpiece to produce instantaneous discharge, causing the mold material to be etched away.

[0056] Electrolytic processing is based on the principle of electrochemical corrosion. The mold workpiece is used as the anode and a specially designed tool electrode is used as the cathode. Direct current is passed through the electrolyte, causing the surface material of the mold workpiece to dissolve according to the shape of the tool electrode, thereby processing the necked taper hole. For processing tasks with small aperture and small adjacent hole spacing, electrolytic processing has unique advantages. By carefully designing the shape of the tool electrode to precisely match the target necked taper hole, the electrolyte is uniformly distributed between the electrode and the workpiece under the action of the electric field during processing, and the workpiece surface material is uniformly dissolved, enabling high-precision taper hole processing without mechanical stress and heat-affected zone, effectively ensuring the original performance of the mold and the edge distance between adjacent holes. In addition, this process can make the inner wall of the hole and the junction position of the hole smooth, effectively control the burr, and can prevent the ceramic tube from peeling or sticking during demolding, without the need for frequent cleaning of the mold, saving time and effort, and improving manufacturing efficiency.

[0057] In some embodiments, as shown in Figures 3-7 The first mold a and the second mold b can include the tube body structure 21 and the butt joint structure 22 arranged on both sides of the tube body structure 21, as shown in Figure 6The butt joint structure 22 on both sides of the pipe body structure 21 extends outward along the diameter direction at both ends of the half ring. This extension design enables the first mold a and the second mold b to precisely match when they are folded and spliced, thereby enhancing the connection strength and stability of the overall mold.

[0058] Further, the arrangement of the butt joint structure 22 in the length direction of the pipe body structure 21 is flexible, and can be continuously arranged or arranged at intervals according to actual production needs. When continuously arranged, the butt joint structure 22 extends uninterruptedly along the length direction of the pipe body, which can provide uniform and strong connection force in the full length range of the mold, effectively ensuring that the mold will not have problems such as local stress concentration or loose connection during negative pressure suction filtration, and is particularly suitable for production scenarios with extremely high molding precision requirements and long ceramic pipe lengths. The butt joint structure 22 arranged at intervals is arranged at a certain interval in the length direction of the pipe body. This arrangement can reduce the overall weight of the mold, reduce material costs, and facilitate the processing and manufacturing of the mold, and is suitable for production needs that are relatively sensitive to cost control and have relatively moderate molding precision requirements.

[0059] In some embodiments, as shown in Figures 3-7 The butt joint structure 22 has a butt joint portion. Referring to Figure 6 and Figure 7 In the embodiments, the butt joint portion is arranged as a flat structure, which makes the processing technology of the mold relatively simple and facilitates the reduction of processing costs. The butt joint portion has a certain length, which can achieve good sealing effect and prevent negative pressure leakage during suction filtration. Alternatively, the butt joint portions of the first mold a and the second mold b are matched with each other in a concave-convex manner. This design can significantly enhance the stability and sealing performance of the spliced mold. During splicing, the convex portion and the concave portion are tightly fitted to form a mechanical locking structure, which can effectively limit the relative displacement between the molds and improve the overall rigidity of the mold during negative pressure suction filtration. At the same time, the concave-convex matching structure can reduce the butt joint gap and further improve the sealing performance, and is suitable for industrial production scenarios with extremely high molding precision and sealing requirements, such as the manufacturing of high-precision ceramic filter pipes.

[0060] In some embodiments, as shown in Figure 3 The first mold a and the second mold b further include a support seat 23 arranged at an outer position of the pipe body structure 21 and / or the butt joint structure 22 and fixedly connected with the pipe body structure 21 and / or the butt joint structure 22. The fixed connection can be welding, bolt connection, etc.

[0061] Due to the ceramic tube forming mold in the actual use process, especially for the length of the mold, in the process of negative pressure filtration, installation and disassembly and long time use, it is easy to cause the deformation of the mold due to its own gravity, external pressure and other factors, and then affect the forming precision and quality of the ceramic tube. The setting of the support seat 23 can effectively share the pressure and stress borne by the mold, and by providing additional support points and support force for the mold, the mold can maintain stable form in all directions, greatly enhancing the shape retention ability of the long mold, ensuring that the mold can still maintain good structural stability under long time use and complex working conditions, thereby ensuring the reliability and consistency of the ceramic tube forming process, and effectively improving the qualified rate and production efficiency of the product.

[0062] In some embodiments, as shown in Figure 3 , Figure 4 and Figure 7 , the support seat 23 includes support blocks 231 arranged below the butt joint portions on both sides, respectively, and the support blocks 231 are fixedly connected with the butt joint portions; the support blocks 231 are stably and fixedly connected with the butt joint portions by welding, high-strength bolt fastening or the like, to provide a reliable support basis for the mold. Optionally, the support blocks 231 can be square tube structures.

[0063] Further, the support blocks 231 and the pipe body structure 21 have a negative pressure filtration channel 231-1 therebetween, that is, the support blocks 231 are not in direct contact with the pipe body structure 21. The provision of the channel ensures that the negative pressure generated by the filtration system can act on the filtration through holes 211 on the pipe body structure 21 without obstruction during the ceramic tube forming process, ensuring that the water in the ceramic slurry is smoothly removed, thereby realizing uniform layering and porosity gradient control of the ceramic tube material. While ensuring the support effect, the problem of filtration failure or local forming failure caused by the support structure blocking the filtration through holes 211 is effectively avoided.

[0064] Further, the support blocks 231 are continuously arranged or arranged at intervals in the length direction of the pipe body structure 21. When continuously arranged, the support blocks 231 extend uninterruptedly along the length direction of the pipe body, which can provide uniform and high-strength support force for the long mold, effectively resist the deformation risk caused by the stress generated by the self-weight of the mold and the negative pressure filtration process, and is particularly suitable for production scenarios with extremely high requirements for mold stability and sensitive forming precision; and the support blocks 231 arranged at intervals are distributed on the length direction of the pipe body at a certain interval. This mode can reduce the overall weight of the mold and reduce material costs while ensuring the basic support strength of the mold, and is convenient for cleaning and maintenance of the filtration channel, and is suitable for production requirements with strict cost control and moderate requirements for mold support strength.

[0065] In some embodiments, as shown in Figure 3、 Figure 4 、 Figure 5 and Figure 6 As shown in FIG. 1, the support seat 23 comprises at least one support sheet 232 arranged below the pipe body structure 21, and the top of the support sheet 232 is provided with an arc-shaped support part 232-1 fixedly connected with the outer wall of the pipe body structure 21. The arc-shaped support part 232-1 is fixedly connected with the outer wall of the pipe body structure 21 by welding or bonding, etc., and closely matches the outer contour shape of the pipe body structure 21 to provide stable and uniform support force for the pipe body structure 21, further enhancing the stability of the whole mold.

[0066] Further, in the circumferential direction of the pipe body structure 21, the arc-shaped support part 232-1 is arranged in a continuous structure or an interval structure. Figure 6 The interval structure is shown in the embodiment to reduce the obstruction to the suction filtration through hole 211. The arc-shaped support part 232-1 in the continuous structure can provide all-around and uninterrupted support for the pipe body structure 21 in the circumferential direction, effectively preventing local deformation of the pipe body under stress. It can be understood that, in addition to the consideration of effective support of the circumferential length, the position and thickness of the support sheet 232 can be set to reduce the obstruction to the suction filtration through hole 211 as much as possible, i.e., the position of the support sheet 232 can be set at the interval part between two rows of circumferential suction filtration through holes 211 (offset setting); or the thickness of the support sheet 232 can be set small enough to avoid affecting the suction filtration through hole 211. Alternatively, the arc-shaped support part 232-1 is provided with a relief hole or groove corresponding to the suction filtration through hole 211, which not only ensures the support of the arc-shaped support part 232-1 to the pipe body structure 21, but also makes the suction filtration process unhindered, so that the water in the ceramic slurry can be smoothly discharged through the suction filtration through hole 211.

[0067] Further, referring to FIG. 2, Figure 4 In the case where two or more support sheets 232 are arranged, the support blocks 231 are arranged at intervals in the length direction of the pipe body structure 21. This interval distribution not only ensures sufficient support force for the pipe body structure 21, but also avoids excessive density of the support sheet 232 to increase the weight and cost of the mold, and facilitates the inspection and maintenance of the mold, and can reasonably disperse the stress in the length direction of the pipe body structure 21 to prevent damage to the mold due to stress concentration.

[0068] Further, in the radial direction of the mold, the two ends of the support sheet 232 are fixedly connected with the support blocks 231 on both sides, such as welding. In the length direction of the mold, the continuous arrangement of the support blocks 231 and the interval arrangement of the support sheets 232 can effectively ensure the straightness and coaxiality of the mold.

[0069] In some embodiments, as shown in Figure 7 and Figure 8 The pore size of the suction filter through hole 211 is not more than 1 mm, and the edge distance between adjacent holes is not more than 1 mm. Optionally, through a large number of experiments and optimization design, when the mold processing pore size is set to 0.81 mm and the edge distance is set to 0.67 mm, the air permeability of the mold can be greatly improved.

[0070] Compared with the 1.2 mm pore size and 1.1 mm edge distance commonly used in domestic molds of the same type, the present application can arrange more suction filter through holes 211 in a unit area, effectively increase the suction filter area, make the water in the ceramic slurry more efficient during negative pressure suction filtration, and further ensure that the ceramic pipe material realizes more uniform stratification and porosity gradient distribution, significantly improves the forming quality and performance of the ceramic filter pipe, and meets the stringent requirements of large-scale industrial waste gas treatment on ceramic filter pipes.

[0071] In some embodiments, as shown in Figures 3-5 The straight line segment 2 in the middle and the flange segment 1 and plug segment 3 on both sides of at least the lower mold in the first mold a and the second mold b are separately arranged. Separating the flange segment 1 and the plug segment 3 from the straight line segment 2 allows the straight line segment 2 to be processed separately with high precision, avoiding the complex operation of processing the flange segment 1 and the plug segment 3 without suction filter through holes 211 while avoiding their positions. This not only reduces the processing difficulty, but also reduces the material waste caused by processing errors, significantly reducing the overall processing cost.

[0072] When the ceramic pipe material is completed, the split straight line segment 2 of the lower mold can be used as a supporting part, separated from other parts of the mold, and the entire wet ceramic pipe can be smoothly taken out of the mold. This method avoids the risk of deformation and damage of the ceramic pipe caused by excessive demolding force when the traditional integral mold is used to take out the wet ceramic pipe, effectively ensuring the integrity of the wet ceramic pipe.

[0073] As another implementation, if the first mold a and the second mold b are arranged in a left-right manner, the straight line segments 2 of the two molds can be further arranged in a split structure. In this case, the two straight line segments 2 can cooperate to support the wet ceramic pipe. By accurately controlling the separation action of the two split straight line segments 2, the wet ceramic pipe can be more evenly stressed during demolding, further improving the stability and reliability of demolding, especially suitable for demolding of large length and large diameter ceramic filter pipes, providing a strong guarantee for the production of high-quality ceramic filter pipes.

[0074] In some embodiments, the straight section 2 is specially designed to be connected with the flange section 1 and the plug section 3 on both sides. In actual operation, the gap between the straight section 2 and the flange section 1 and the plug section 3 is controlled to be 0.5-1 mm. This gap range can ensure the tightness of the connection between the components to prevent pressure leakage during negative pressure filtration, and can also avoid excessive tight connection that makes it difficult to disassemble. By precisely controlling this gap, the overall sealing of the mold is ensured, and the installation and disassembly of the components are facilitated, improving the convenience of the mold.

[0075] As another connection method, a hole plate is superimposed on the diameter end of the flange or plug on one side, and the hole plate is formed with a concave-convex edge structure through a special process. When the straight section 2 is assembled with the flange section 1 and the plug section 3, the edge of the straight mold can be precisely lapped with the concave-convex edge. Since the hole plate itself is full of holes, which is consistent with the nature of the filtration through hole 211 on the straight section 2, this lapping method will not affect the overall filtration performance of the mold. On the premise of ensuring the normal play of the filtration function, the lapping structure of the concave-convex edge enhances the stability of the connection between the components, effectively preventing the loosening of the components during the formation of the ceramic tube from affecting the product quality.

[0076] It should be noted that the flange section 1 can also include a section of pipe section with the same diameter as the straight section 2 without filtration through hole 211.

[0077] In some embodiments, the pipe body structure 21 of the first mold a and the second mold b is made of 3 / 4H stainless steel. 3 / 4H stainless steel has good strength, hardness and corrosion resistance. In the process of forming the ceramic tube, it can maintain stable physical and chemical properties for a long time in the face of chemical corrosion of ceramic slurry and negative pressure environment in the filtration process, avoid affecting the forming quality of the ceramic tube due to corrosion, deformation and other problems of the mold, effectively prolong the service life of the mold, and reduce the maintenance and replacement cost of the mold.

[0078] In some embodiments, the thickness of the pipe body structure 21 of the first mold a and the second mold b is 0.6 mm. This thickness design effectively reduces the overall weight of the mold while ensuring the strength of the mold structure, and reduces the material cost. The thickness of 0.6 mm enables the mold to withstand internal pressure and maintain structural stability during negative pressure filtration, and also prevents the thick wall from affecting the filtration efficiency, ensuring that the water in the ceramic slurry can be quickly and smoothly discharged through the filtration through hole 211, and realizing the uniform formation of the ceramic tube material.

[0079] In some embodiments, the inner wall of the pipe body structure 21 is formed with a smooth surface with a roughness of no more than 0.8 μm. The smooth inner wall surface can effectively reduce the adhesion of the ceramic slurry to the inner wall of the mold, reduce the demolding resistance, make the formed ceramic pipe more easily demolded from the mold, and avoid quality problems such as surface scratching and peeling of the ceramic pipe during the demolding process due to the roughness of the inner wall. At the same time, the low-roughness inner wall helps to ensure the smoothness and flatness of the outer surface of the ceramic pipe, improve the product quality of the ceramic filter pipe, and better meet the use requirements in the field of industrial waste gas treatment.

[0080] It should be understood that the present application is not limited to the particular configurations and processes described above and shown in the drawings. For the sake of brevity, detailed descriptions of known methods are omitted herein. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order of the steps, after understanding the spirit of the present application.

[0081] In the present application, the features described and / or exemplified for one embodiment can be used in the same way or in a similar way in one or more other embodiments, and / or in combination with or instead of the features of the other embodiments.

[0082] The above description is only the preferred embodiments of the present application and is not intended to limit the present application. The embodiments of the present application can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A ceramic tube forming mold characterized by, The ceramic pipe forming die comprises a first die (a) and a second die (b) arranged symmetrically, the cross section of the first die (a) and the second die (b) in the radial direction is a half ring shape, and the first die (a) and the second die (b) are folded to form a complete ring forming die; The first die (a) and the second die (b) each comprise a flange section (1), a straight section (2) and a plug section (3) arranged in sequence along the axis direction thereof; wherein the straight section (2) is an integral forming structure, the length of the straight section (2) is not less than 2500mm, and a dense and uniformly distributed suction filter through hole (211) is arranged on the pipe body structure (21) of the straight section (2).

2. The ceramic tube forming mold according to claim 1, characterized by The suction filter through hole (211) is arranged as a tapered hole, the inner wall hole diameter of the tapered hole is larger than the outer wall hole diameter; or, a chamfer structure is formed at the inner wall part of the suction filter through hole (211).

3. The ceramic tube forming mold according to claim 1, characterized by The first die and the second die comprise the pipe body structure (21) and the butt joint structure (22) arranged on both sides of the pipe body structure (21), the butt joint structures (22) on both sides respectively extend outward along the diameter direction at the two ends of the half ring of the pipe body structure (21); In the length direction of the pipe body structure (21), the butt joint structures (22) are continuously arranged or arranged at intervals.

4. The ceramic tube forming mold according to claim 3, characterized by The butt joint structure (22) has a butt joint part; the butt joint part is arranged as a plane, or the butt joint parts of the first die (a) and the second die (b) are matched with each other in concave-convex.

5. The ceramic tube forming mold according to claim 3, wherein The first die (a) and the second die (b) further comprise a support seat (23), the support seat (23) is arranged at the outer side position of the pipe body structure (21) and / or the butt joint structure (22), and is fixedly connected with the pipe body structure (21) and / or the butt joint structure (22).

6. The ceramic tube forming mold according to claim 5, wherein The support seat (23) comprises support blocks (231) arranged below the butt joint parts on both sides respectively, and the support blocks (231) are fixedly connected with the butt joint parts; The support blocks (231) have negative pressure suction filter channels (231-1) between the support blocks (231) and the pipe body structure (21); In the length direction of the pipe body structure (21), the support blocks (231) are continuously arranged or arranged at intervals.

7. The ceramic tube forming mold according to claim 5, wherein The support seat (23) comprises at least one support sheet (232) arranged below the pipe body structure (21), the top of the support sheet (232) has an arc-shaped support part (232-1), and the arc-shaped support part (232-1) is fixedly connected with the outer wall of the pipe body structure (21); In the circumferential direction of the pipe body structure (21), the arc-shaped support parts (232-1) are arranged as continuous structures or interval structures; In the case where more than two support sheets (232) are arranged, the support blocks (231) are arranged at intervals in the length direction of the pipe body structure (21).

8. The ceramic tube forming mold of claim 1, wherein, The hole diameter of the suction filter through hole (211) is not more than 1mm, and the edge distance between adjacent holes is not more than 1mm.

9. The ceramic tube forming mold of claim 1, wherein, At least one of the first mold (a) and the second mold (b) is located at the lower part, and the straight section (2) at the middle part is separately arranged with the flange section (1) and the plug section (3) at the two sides.

10. The ceramic tube forming mold of claim 1, wherein, The pipe body structure (21) of the first mold (a) and the second mold (b) is made of 3 / 4H stainless steel; and / or, The thickness of the pipe body structure (21) of the first mold and the second mold is 0.6mm; and / or, The inner wall of the pipe body structure (21) is formed with a smooth surface, and the roughness is not more than 0.8μm.

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