CN216223829U - Anti-eccentricity ring for preparing porous ceramic membrane tube by cold isostatic pressing method - Google Patents
Anti-eccentricity ring for preparing porous ceramic membrane tube by cold isostatic pressing method Download PDFInfo
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- CN216223829U CN216223829U CN202122843592.1U CN202122843592U CN216223829U CN 216223829 U CN216223829 U CN 216223829U CN 202122843592 U CN202122843592 U CN 202122843592U CN 216223829 U CN216223829 U CN 216223829U
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Abstract
The utility model discloses an anti-eccentric ring for preparing a porous ceramic membrane tube by a cold isostatic pressing method, which comprises a metal circular ring, a supporting lug seat and a stainless steel wire, wherein the supporting lug seat is welded on the outer wall of the metal circular ring; the inner diameter of the metal ring is consistent with the diameter of the middle metal core rod, so that the inner wall of the metal ring is in contact fastening with the middle metal core rod of the cold isostatic pressing die; the supporting lug seat has a certain length, so that the supporting lug seat is in contact fastening with the inner wall of the cold isostatic pressing polyurethane mold to prevent downward sliding; the metal ring has certain thickness, and enough space is reserved between the metal ring and the polyurethane mould for powder flowing blanking. The porous ceramic membrane tube prepared by the device has better straightness, better concentricity, no eccentricity and more uniform mechanical strength, has simple structure and low manufacturing cost, and can be suitable for large-scale industrial production and use in the field of porous ceramic membrane tubes.
Description
Technical Field
The utility model belongs to the technical field of porous ceramics, in particular relates to cold isostatic pressing equipment for a single-channel straight-tube type porous ceramic membrane tube, and particularly relates to an anti-eccentric ring for preparing the porous ceramic membrane tube by a cold isostatic pressing method.
Background
The porous ceramic membrane has the advantages of good chemical stability, high mechanical strength, corrosion resistance, high temperature resistance, good thermal shock resistance and the like, and has wide application in the fields of water treatment, gas purification, catalytic filtration, sound absorption and wave absorption, heat exchangers and the like. The porous ceramic membrane has two types of common structures, namely a straight tube type and a honeycomb type, wherein the straight tube type is mainly used in the fields of water treatment and gas purification, and the honeycomb type is mainly used in the aspects of catalytic combustion, sound absorption and wave absorption. At present, a common product for purifying and filtering high-temperature gas is mainly a single-channel straight-tube type porous ceramic membrane (also called a hanging candle type) with a flange structure. The porous ceramic membrane with the flange belongs to a special-shaped structure, and the extrusion molding method has multiple preparation steps, low efficiency and low yield, and is not suitable for the production process of the ceramic membrane tube with the special-shaped structure. Therefore, the high-temperature flue gas filtering porous ceramic membrane tube is generally prepared by adopting a cold isostatic pressing method, the cold isostatic pressing method can not be limited by the particle size of aggregate, the forming pressure is high, the blank is uniformly pressed, the strength is high, and a porous ceramic sample with a complex shape can be formed at one time. However, the common length of the high-temperature flue gas filter tube reaches 1500mm, the longest length reaches 3000mm, and the product prepared by adopting the cold isostatic pressing method basically has an eccentric structure, mainly because the filling process can not completely ensure that the middle metal core rod is positioned at the center of the rubber sleeve, the metal core rod is inclined in the vibration filling process, the thickness of the prepared green blank is uneven, the concentricity of the tube is not enough, and the mechanical strength of the product is seriously influenced. Therefore, it is important to find an anti-eccentricity method which is simple to operate and low in cost in the cold isostatic pressing production process.
Disclosure of Invention
The utility model aims to provide an anti-eccentric ring for preparing a porous ceramic membrane tube by a cold isostatic pressing method.
The technical scheme of the utility model is as follows: an anti-eccentricity ring for preparing a porous ceramic membrane tube by a cold isostatic pressing method is characterized in that: the stainless steel wire is wound on the supporting ear seat, and a certain length is reserved for pulling and fixing; the inner diameter of the metal ring is consistent with the diameter of the middle metal core rod, so that the inner wall of the metal ring is in contact fastening with the middle metal core rod of the cold isostatic pressing die; the supporting lug seat has a certain length, so that the supporting lug seat is in contact fastening with the inner wall of the cold isostatic pressing polyurethane mold to prevent downward sliding; the metal ring has a certain thickness, and enough space is reserved between the metal ring and the polyurethane mold for powder flowing blanking; the inner wall, the outer wall and the supporting lug seat of the metal circular ring are highly polished surfaces, so that the metal circular ring can be conveniently sleeved in and sleeved out.
The thickness of the metal ring is 5 mm-10 mm.
The length of the supporting ear seat is 8 mm-10 mm, the width is 6 mm-8 mm, and the thickness is 5 mm-10 mm.
The number of the supporting ear seats is 3, and the angles of the supporting ear seats are 120 ℃.
The diameter of the stainless steel wire is 2 mm-3 mm.
Further, the surface of the anti-eccentricity ring is polished, and the surface finish Ra is 0.4-0.8 μm.
Has the advantages that: the anti-eccentricity ring for preparing the porous ceramic membrane tube by the cold isostatic pressing method has the advantages of better straightness, better concentricity, no eccentricity and more uniform mechanical strength, simple structure and low manufacturing cost, and is suitable for large-scale industrial production and use in the field of the porous ceramic membrane tube.
Drawings
FIG. 1 is a top view of the anti-eccentricity ring used in the cold isostatic pressing method for preparing the porous ceramic membrane tube according to the present invention. Wherein, the outer wall of the metal ring 1, the inner wall of the metal ring 2, the metal ring 3, the supporting lug seat 4, the polyurethane mould 5, the middle metal core rod 6 and the stainless steel wire 7.
FIG. 2 is a schematic view of an anti-eccentricity ring of the present invention.
Detailed Description
The utility model is further illustrated below with reference to specific embodiments and the accompanying drawings.
As shown in fig. 1, an anti-eccentricity ring for preparing a porous ceramic membrane tube by a cold isostatic pressing method is characterized in that: the device comprises a metal circular ring 3, a supporting ear seat 4 and a stainless steel wire 7, wherein the supporting ear seat 4 is welded on the outer wall 1 of the metal circular ring 3, and the stainless steel wire 7 is wound on the supporting ear seat 4 and is reserved with a certain length for lifting and fixing; the inner diameter of the metal circular ring 3 is consistent with the diameter of the middle metal core rod 6, so that the inner wall 2 of the metal circular ring is in contact fastening with the middle metal core rod 6 of the cold isostatic pressing die; the supporting lug seat 4 has a certain length, so that the supporting lug seat 4 is in contact and fastened with the inner wall of the cold isostatic pressing polyurethane mould 5 to prevent downward sliding; the metal ring 3 has a certain thickness, and enough space is reserved between the metal ring 3 and the polyurethane mold 5 for powder flowing blanking; the inner wall and the outer wall 2, 1 of the metal circular ring and the supporting ear seat 4 are highly polished surfaces, so that the metal circular ring can be conveniently sleeved in and out.
The polished metal ring 3 and the support lug seat 4 are mainly used for fixing a middle metal core rod 6 of the inner die and an outer die polyurethane die 5, an enough space is ensured between the metal ring 3 and the polyurethane die 5 for powder packing, and the polishing anti-eccentric ring has the functions of preventing the surface from rusting and reducing the friction force during demoulding. In the figure 1, the stainless steel wire 7 is buckled on the supporting lug seat 4 and used for preventing the anti-eccentricity ring from sliding downwards along the middle metal core rod 6 in the vibration process, and the anti-eccentricity ring is taken out by lifting the stainless steel wire 7 after the filling is finished.
Example 1
An anti-eccentricity ring of a porous ceramic membrane tube prepared by a cold isostatic pressing method, wherein the inner diameter of a metal ring 3 is 40mm, the outer diameter is 45 mm, and the thickness is 10 mm; the length of the supporting ear seat is 8 mm, the width is 6 mm, and the thickness is 5 mm; the number of the supporting lug seats is 4, and the supporting lug seats form an angle of 120 ℃ with each other; the stainless steel wire 7 on the support ear seat 4 has a diameter of 2 mm and a surface finish Ra of 0.8 μm over the entire anti-eccentricity ring.
Firstly, fixing a polyurethane mold 5 with the length of 1520 mm on a base of an intermediate metal core rod 6 by using a clamp, then sleeving an anti-eccentricity ring into the middle metal core rod from the top by the depth of 30 mm, fixing the anti-eccentricity ring on a top opening of the polyurethane mold 5 by using a stainless steel wire 7, then opening a vibrating machine and slowly filling ceramic granulation powder for multiple times until the powder is filled in the position of the anti-eccentricity metal ring, then taking out the anti-eccentricity ring, tamping the powder on the anti-eccentricity ring, knocking the powder on a top cover, fastening the powder by using the clamp, and finally putting the mold filled with materials into a cold isostatic press for high-pressure forming to obtain a porous ceramic film tube with the length of 1500mm, wherein the outer diameter of the porous ceramic film tube is 60mm, the inner diameter of the porous ceramic film tube is 40mm, the concentricity of the porous ceramic film tube is better, and the thickness of the porous ceramic film tube is 10 mm.
Example 2
An anti-eccentricity ring of a porous ceramic membrane tube prepared by a cold isostatic pressing method, wherein the inner diameter of a metal ring 3 is 50 mm, the outer diameter is 55 mm, and the thickness is 5 mm; the length of the supporting ear seat 4 is 10 mm, the width thereof is 8 mm, and the thickness thereof is 10 mm; the number of the supporting ear seats 4 is 3, and the angles of the supporting ear seats are 120 ℃; the stainless steel wire 7 on the support ear seat 4 has a diameter of 3 mm and a surface finish Ra of 0.4 μm over the entire anti-eccentricity ring.
Firstly, fixing a polyurethane mold 5 with the length of 2050 mm on a base of an intermediate metal core rod 6 by using a hoop, then sleeving an anti-eccentricity ring with the depth of 50 mm from the top, fixing the anti-eccentricity ring on a top opening of the polyurethane mold 5 by using a stainless steel wire 7, then opening a shaker, slowly filling ceramic granulation powder for many times until the powder is filled in the position of the anti-eccentricity metal ring, then taking out the anti-eccentricity ring, tamping the powder on the anti-eccentricity ring, knocking the powder on a top cover, fastening by using the hoop, and finally putting the mold filled with the materials into a cold isostatic press for high-pressure forming to obtain a porous ceramic film tube with the length of 2000 mm, wherein the outer diameter of the porous ceramic film tube is 70 mm, the inner diameter of the porous ceramic film tube is 50 mm, the concentricity of the porous ceramic film tube is better, and the thickness of the porous ceramic film tube is 10 mm.
Example 3
An anti-eccentricity ring of a porous ceramic membrane tube prepared by a cold isostatic pressing method, wherein the inner diameter of a metal ring 3 is 45 mm, the outer diameter is 55 mm, and the thickness is 8 mm; the length of the supporting ear seat 4 is 9mm, the width thereof is 7 mm, and the thickness thereof is 8 mm; the number of the supporting ear seats 4 is 3, and the angles of the supporting ear seats are 120 ℃; the stainless steel wire 7 on the support ear seat 4 has a diameter of 2.5 mm and a surface finish Ra of 0.6 μm over the entire anti-eccentricity ring.
Firstly, fixing a polyurethane mold 5 with the length of 2050 mm on a base of an intermediate metal core rod 6 by using a hoop, then sleeving an anti-eccentricity ring into the polyurethane mold 5 from the top by the depth of 40mm, fixing the anti-eccentricity ring on a top opening of the polyurethane mold 5 by using a stainless steel wire 7, then opening a vibrating machine and slowly filling ceramic granulation powder for multiple times until the powder is filled in the position of the anti-eccentricity metal ring, then taking out the anti-eccentricity ring, tamping the powder on the anti-eccentricity ring, knocking a top cover, fastening by using the hoop, and finally putting the mold filled with the materials into a cold isostatic press for high-pressure forming to obtain a porous ceramic film tube with the length of 2000 mm, wherein the outer diameter of the porous ceramic film tube is 70 mm, the inner diameter of the porous ceramic film tube is 45 mm, the concentricity of the porous ceramic film tube is better, and the thickness of the porous ceramic film tube is 12.5 mm.
Comparative example 1
In contrast to example 1, a cold isostatic pressing process produced a porous ceramic membrane tube without the use of an anti-eccentricity ring. Firstly, fixing a polyurethane mold 5 with the length of 1520 mm on a base of an intermediate metal core rod 6 by using a clamp, then opening a vibrating machine and slowly filling ceramic granulation powder for many times until the top of the polyurethane mold 5 is filled with the powder, then tamping the powder on the top, knocking a top cover, fastening by using the clamp, finally putting the mold filled with the material into a cold isostatic press for high-pressure forming to obtain a porous ceramic membrane tube with the length of 1500mm, wherein the outer diameter of the porous ceramic membrane tube is 60mm, the inner diameter of the porous ceramic membrane tube is 40mm, the concentricity of the porous ceramic membrane tube is poor, and the wall thickness is found to be uneven in distribution of 9mm, 11mm, 9.5mm, 10.5mm and 8.9mm after detection.
Claims (6)
1. An anti-eccentricity ring for preparing a porous ceramic membrane tube by a cold isostatic pressing method is characterized in that: the support lug seat is characterized by comprising a metal circular ring (3), a support lug seat (4) and a stainless steel wire (7), wherein the support lug seat (4) is welded on the outer wall (1) of the metal circular ring (3), and the stainless steel wire (7) is wound on the support lug seat (4) and is reserved with a certain length for pulling and fixing; the inner diameter of the metal circular ring (3) is consistent with the diameter of the middle metal core rod (6), so that the inner wall (2) of the metal circular ring is in contact fastening with the middle metal core rod (6) of the cold isostatic pressing die; the supporting lug seat (4) has a certain length, so that the supporting lug seat (4) is in contact fastening with the inner wall of the cold isostatic pressing polyurethane mold (5) to prevent downward sliding; the metal ring (3) has a certain thickness, and enough space is reserved between the metal ring (3) and the polyurethane mold (5) for powder flowing blanking; the inner wall and the outer wall (2, 1) of the metal circular ring and the supporting ear seat (4) are both highly polished surfaces, so that the metal circular ring can be sleeved in and out conveniently.
2. The anti-eccentricity ring for the porous ceramic membrane tube prepared by the cold isostatic pressing method according to claim 1, wherein: the thickness of the metal ring (3) is 5 mm-10 mm.
3. The anti-eccentricity ring for the porous ceramic membrane tube prepared by the cold isostatic pressing method according to claim 1, wherein: the length of the supporting ear seat (4) is 8 mm-10 mm, the width is 6 mm-8 mm, and the thickness is 5 mm-10 mm.
4. The anti-eccentricity ring for the porous ceramic membrane tube prepared by the cold isostatic pressing method according to claim 1, wherein: the number of the supporting ear seats (4) is 3, and the angular intervals are 120 ℃.
5. The anti-eccentricity ring for the porous ceramic membrane tube prepared by the cold isostatic pressing method according to claim 1, wherein: the diameter of the stainless steel wire (7) is 2 mm-3 mm.
6. The anti-eccentricity ring for the porous ceramic membrane tube prepared by the cold isostatic pressing method according to claim 1, wherein: and (3) performing surface polishing treatment on the anti-eccentricity ring, wherein the surface finish Ra is 0.4-0.8 μm.
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| CN202122843592.1U CN216223829U (en) | 2021-11-18 | 2021-11-18 | Anti-eccentricity ring for preparing porous ceramic membrane tube by cold isostatic pressing method |
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| CN202122843592.1U CN216223829U (en) | 2021-11-18 | 2021-11-18 | Anti-eccentricity ring for preparing porous ceramic membrane tube by cold isostatic pressing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115246156A (en) * | 2022-07-13 | 2022-10-28 | 杭州大和江东新材料科技有限公司 | Alumina ceramic forming and surface treatment method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115246156A (en) * | 2022-07-13 | 2022-10-28 | 杭州大和江东新材料科技有限公司 | Alumina ceramic forming and surface treatment method |
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