Double-layer centrifugal casting clamp for column type hollow fiber membrane module and casting method of double-layer centrifugal casting clamp

Abstract

The invention discloses a double-layer centrifugal casting clamp for a column type hollow fiber membrane module and a casting method of the double-layer centrifugal casting clamp. The double-layer centrifugal casting clamp comprises a casting disc, a flexible glue inlet inner plug, a flexible glue inlet pipe and a hard glue inlet pipe. According to the invention, the flexible glue inlet inner plug and the flexible glue inlet central pipe which are in sealing connection with the water distribution frame of the membrane shell are specially arranged in the center of the casting disc, and the hard glue inlets distributed in the circumferential direction of the casting disc are combined, so that double-layer casting of the hard glue supporting layer and the flexible glue protection layer in a centrifugal state is realized; and the soft rubber can be directly injected from the center above the hard rubber layer and uniformly leveled to the roots of all the membrane wires under the action of centrifugal force, so that the problems of poor soft rubber leveling, creeping along the membrane wires and insufficient root protection in the traditional double-layer process are thoroughly solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of hollow fiber ultrafiltration membrane module manufacturing, and particularly relates to a double-layer centrifugal casting clamp for a column type hollow fiber membrane module and a casting method thereof. BACKGROUND

[0002] A separation membrane is usually a membrane module as a permeation unit. A column type membrane module is assembled by thousands of hollow fiber membrane filaments made of high molecular polymers in a membrane shell. The two ends of the membrane filaments are solidified and formed with the two ends of the membrane shell by casting epoxy resin or polyurethane. The casting quality of the membrane module is of great importance to the ultrafiltration performance and efficiency of the permeation unit. The commonly used casting methods include vertical static casting method and horizontal centrifugal casting method.

[0003] The main process of the vertical static casting method is as follows: a mold is installed at the lower end of the membrane shell, and the membrane shell is vertically placed on the casting frame. The glue is first fed from the glue inlet at the lower end of the membrane shell, solidified, and formed. Then the membrane shell is inverted, the uncast end is downward, a mold is installed, and the glue is fed from the glue inlet at the end in the same way, solidified, and formed. The equipment cost of this method is low, and a casting frame only needs about 10,000 yuan. Moreover, 10 membrane modules can be cast at the same time by one casting frame, and the production efficiency is high. Due to the production cost, most of the ultrafiltration membranes of small enterprises adopt this method. However, the disadvantages are as follows:

[0004] (1) The glue feeding speed is fast, and the high temperature generated by the glue reaction will cause the membrane filaments to burn (blackening of the membrane filaments);

[0005] (2) Air bubbles are easily stored in the glue, and the glue needs to be supplemented, which wastes labor and materials and causes water leakage, affecting the water quality;

[0006] (3) The glue flows unevenly: the glue has poor flowability due to its high viscosity, and there is a risk of soft glue leakage, which will cause water leakage;

[0007] (4) Poor sealing: the glue and the membrane filaments are not firmly bonded, and cracking occurs, which will cause water leakage;

[0008] (5) The soft glue cannot flow to all the membrane filament roots, and cannot play a role in protecting the membrane filaments;

[0009] (6) The membrane filaments at the lower end are prone to bending and dispersion during the static process, which will cause the bending of the casting layer membrane filaments, affect the water inlet and outlet of the membrane filaments, and affect the appearance of the product.

[0010] The main process of horizontal centrifugal casting method is to horizontally place the membrane shell with membrane filaments in the centrifugal casting machine after installing molds at both ends of the membrane shell, drive the membrane shell to rotate at high speed through the centrifugal casting machine, and slowly pour glue into the membrane shell from the glue inlet at both ends of the membrane shell; under the action of centrifugal force, the glue flows to the surface of the mold at both ends of the membrane shell, solidifies and forms. This method pours glue while rotating, the injected glue is continuously pushed to both ends of the membrane shell under the action of centrifugal force, air bubbles are easily pushed out, the rotation process can drive air flow, which is beneficial to the cooling of the glue, and can prevent the burning of the membrane filaments, but the disadvantages are: high equipment cost, low production efficiency, the current design of the clamp cannot realize the double-layer centrifugal casting process of hard glue and soft glue, and the existing double-layer casting method is to first cast a hard glue layer through centrifugal casting, and then pour soft glue into the membrane shell through the side glue inlet in a static state after the hard glue layer is solidified. Since the membrane filaments are arranged between the water distribution frame in the center of the membrane assembly and the hard glue layer, the channel resistance is large, the soft glue is difficult to flow flat on the hard glue layer, and the soft glue will flow down along the membrane filaments, causing the soft glue to be left on the surface of the membrane filaments, the glue climbing height is high, and the function of protecting the membrane filaments at the root cannot be achieved.

[0011] CN214681059U discloses a technical scheme of a double-layer casting mold for a hollow membrane assembly, which pours glue through the through hole at the bottom of the glue containing clamp and the glue inlet nozzles with different heights, improves the glue flow speed, reduces the casting difficulty, and can further reduce the casting time and the flow leveling time, and improves the flatness of the glue layer after casting. In this scheme, the second glue inlet is left with hard glue after pouring glue, and the glue in the glue inlet must be removed to achieve demolding, which forms a through hole in the glue layer on the membrane assembly, directly affecting the actual application of the assembly. Therefore, a new casting clamp needs to be designed to realize the double-layer centrifugal casting process of hard glue and soft glue. SUMMARY

[0012] The present application aims to overcome the defects of the prior art and provide a double-layer centrifugal casting clamp for a column type hollow fiber membrane assembly.

[0013] Another object of the present application is to provide a column type membrane assembly centrifugal casting method using the above-mentioned double-layer centrifugal casting clamp.

[0014] The technical scheme of the present application is as follows:

[0015] A double-layer centrifugal casting clamp for a column type hollow fiber membrane assembly, characterized in that it comprises a casting disc, a soft glue inlet plug, a soft glue inlet pipe and a hard glue inlet pipe.

[0016] The casting disc has a Teflon surface layer, is disc-shaped, has a soft glue inlet through hole at the center, has a hard glue inlet through hole at the eccentric position, has a hard glue containing recess on the side facing the membrane shell, and the edge of the hard glue containing recess has a sealing ring;

[0017] The soft glue feeding inner plug has a Teflon surface layer, is in a cylindrical shape, has a soft glue feeding center pipe penetrating the center of the two end faces of the cylinder, and the height of the soft glue feeding inner plug is higher than the height of the solidified and molded hard glue;

[0018] The soft glue feeding inner plug is arranged at the center of the hard glue containing recess on the side of the casting plate facing the membrane shell, the soft glue feeding pipe is in communication with the soft glue feeding center pipe of the soft glue feeding inner plug through the soft glue feeding through hole on the casting plate, and the soft glue feeding pipe is arranged on the soft glue feeding through hole.

[0019] In a preferred embodiment of the present application, the soft glue feeding pipe is arranged on the soft glue feeding through hole through a first hexagonal flange surface locking nut, and the hard glue feeding pipe is arranged on the hard glue feeding through hole through a first hexagonal flange surface locking nut.

[0020] In a preferred embodiment of the present application, the casting plate is a casting plate made of 6061 aluminum material, and the soft glue feeding inner plug is a soft glue feeding inner plug made of 6061 aluminum material.

[0021] In a preferred embodiment of the present application, one end of the soft glue feeding center pipe protrudes from one end face of the soft glue feeding inner plug.

[0022] In a preferred embodiment of the present application, a plurality of casting rods are arranged in the hard glue containing recess on the side of the casting plate facing the membrane shell and are uniformly arranged around the soft glue feeding inner plug.

[0023] Further preferably, the plurality of casting rods have a Teflon surface layer, one end of each casting rod is in a conical shape, the other end is an assembly end, and the assembly end is arranged on the casting plate.

[0024] More preferably, the assembly end of each casting rod is arranged on the casting plate through a second hexagonal flange surface locking nut.

[0025] A columnar membrane module centrifugal casting method, comprising the following steps:

[0026] (1) uniformly binding a plurality of membrane fiber bundles by bundling the hollow fiber membranes and fixing the membrane fiber bundles on the center pipe support of the membrane shell, hanging the membrane shell after passing through the membrane fiber bundles, and cutting off the tail of the hollow fiber membrane exposed outside the membrane shell along the edge of the end of the membrane shell to ensure that the ports of all the hollow fiber membranes are flush and open;

[0027] (2) Assembling the double-layer centrifugal casting fixture with several casting rods with the water distribution frame with several partitions of the same size, inserting the several casting rods into the center of the several membrane filaments respectively, and installing the water inlet end of each membrane filament bundle in each partition respectively, confirming the position and the hollow fiber membrane filament, and then surrounding the several partitions with several buckles to fix the water inlet end of the membrane filament bundle, and then fastening the double-layer centrifugal casting fixture on the water inlet end of the membrane shell;

[0028] (3) Taking down the assembly formed in step (2) and placing it horizontally on the operation table, cutting the hollow fiber membrane filament at the water outlet end, temporarily sealing the port of the cut hollow fiber membrane filament with silica gel, and then installing the double-layer centrifugal casting fixture without several casting rods, assembling the double-layer centrifugal casting fixture with the water distribution frame with several partitions of the same size, installing the water outlet end of each membrane filament bundle in each partition respectively, confirming the position and the hollow fiber membrane filament, surrounding the six partitions with several buckles to fix the water outlet end of the membrane filament bundle, and then fastening the double-layer centrifugal casting fixture on the water outlet end of the membrane shell;

[0029] (4) Placing the assembled membrane assembly horizontally into the horizontal centrifugal casting machine, connecting the two glue pouring barrels with the water inlet end and the water outlet end through the hose and the hard glue pipe, and fastening to avoid shaking during centrifugation;

[0030] (5) Adding epoxy resin hard glue into the two glue pouring barrels, and pouring with the horizontal centrifugal casting machine until the epoxy resin hard glue is completely cured;

[0031] (6) After the epoxy resin hard glue is cured, stop the machine, change the hose to the soft glue pipe, and add the prepared polyurethane soft glue into the two glue pouring barrels; restart the horizontal centrifugal casting machine for pouring;

[0032] (7) After the polyurethane soft glue is completely cured, remove the double-layer centrifugal casting fixture at the water inlet end and the water outlet end.

[0033] In a preferred embodiment of the present application, in step (5), first run at a low speed of 100-130 r / min to preliminarily distribute the epoxy resin hard glue and remove large air bubbles, and then increase the speed to 200-300 r / min for high-speed centrifugation.

[0034] In a preferred embodiment of the present application, in step (6), centrifuge at a speed of 180-220 r / min to inject the polyurethane soft glue from above the cured epoxy resin hard glue through the soft glue inlet center pipe and flow evenly to the roots of all hollow fiber membrane filaments.

[0035] The beneficial effects of the present application are:

[0036] 1. The present application realizes double-layer casting of the hard gel support layer and the soft gel protective layer under the centrifugal state by specially arranging the soft gel inlet plug and the soft gel inlet center tube in the center of the casting tray and sealingly connecting them with the water distribution frame of the membrane shell, in combination with the circumferentially distributed hard gel inlet ports of the casting tray, so that the soft gel can be directly injected from the center above the hard gel layer and uniformly flow to all membrane filament roots under the action of the centrifugal force, completely solving the problems of soft gel flow difference, membrane filament crawling and insufficient root protection in the traditional double-layer process;

[0037] 2. All the gel inlet tubes and casting rods in the present application adopt the quick detachable fixing mode of hexagonal flange face locking nuts, which facilitates direct replacement of the gel inlet hose after hard gel casting to continue centrifugal injection of soft gel, without interrupting the centrifugation or disassembling the components, greatly improving the production efficiency and maintaining the continuity of the casting process;

[0038] 3. The double-layer centrifugal casting clamp of the present application is made of 6061 aluminum alloy material and coated with a Teflon coating on the surface, which on the one hand significantly reduces the weight of the clamp, lowers the centrifugal resistance and reduces energy consumption, and on the other hand the low surface energy characteristics of Teflon make the epoxy / polyurethane gel layer easily separate from the clamp, greatly reducing the difficulty of demolding and avoiding the rupture of the cast gel layer caused by forced demolding;

[0039] 4. The double-layer centrifugal casting process of the present application combines with the central soft gel channel, making the soft gel layer thinner, more uniform and higher in end face flatness, and the membrane filament roots are fully protected, the overall sealing performance and crack resistance of the component are significantly improved, and the product qualification rate and long-term operation stability are greatly improved;

[0040] 5. The double-layer centrifugal casting clamp of the present application has simple structure, convenient disassembly and maintenance, and low manufacturing cost, which is suitable for direct modification and use of existing horizontal centrifugal casting machines, and is convenient for large-scale industrialization and application. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is the exploded view of the double-layer centrifugal casting clamp provided at the water outlet end in embodiment 1 of the present application.

[0042] Figure 2 is the assembly side view of the double-layer centrifugal casting clamp provided at the water outlet end in embodiment 1 of the present application.

[0043] Figure 3 is the top view of the double-layer centrifugal casting clamp provided at the water outlet end in embodiment 1 of the present application.

[0044] Figure 4 is the bottom view of the double-layer centrifugal casting clamp provided at the water outlet end in embodiment 1 of the present application.

[0045] Figure 5The exploded view of the double-layer centrifugal casting clamp arranged at the water inlet end in Embodiment 2 of the application.

[0046] Figure 6 The assembled side view of the double-layer centrifugal casting clamp arranged at the water inlet end in Embodiment 2 of the application.

[0047] Figure 7 The top view of the double-layer centrifugal casting clamp arranged at the water inlet end in Embodiment 2 of the application.

[0048] Figure 8 The bottom view of the double-layer centrifugal casting clamp arranged at the water inlet end in Embodiment 2 of the application.

[0049] Figure 9 The device connection schematic diagram of the columnar membrane module centrifugal casting method in Embodiment 3 of the application.

[0050] Figure 10 The assembled top view of the double-layer centrifugal casting clamp arranged at the water inlet end and the water distribution clamp in the columnar membrane module centrifugal casting method in Embodiment 3 of the application.

[0051] Figure 11 The assembled top view of the double-layer centrifugal casting clamp arranged at the water outlet end and the water distribution clamp in the columnar membrane module centrifugal casting method in Embodiment 3 of the application. DETAILED DESCRIPTION

[0052] The technical solutions of the application are further described and explained in the following through specific embodiments in combination with the drawings.

[0053] Embodiment 1

[0054] As shown in the drawings, Figures 1 to 4 a double-layer centrifugal casting clamp for a columnar hollow fiber membrane module is used for water outlet end casting, which has a casting disc 1, a soft rubber inlet plug 2, a soft rubber inlet pipe 3 and a hard rubber inlet pipe 4.

[0055] The casting disc 1 is made of 6061 aluminum and has a Teflon surface layer, which is disc-shaped, has a soft rubber inlet through hole 10 at the center and a hard rubber inlet through hole 11 at the eccentric position, and has a hard rubber containing recess 12 on the side facing the membrane shell, and the edge of the hard rubber containing recess 12 has a sealing ring 13;

[0056] The soft rubber inlet plug 2 is made of 6061 aluminum and has a Teflon surface layer, which is cylindrical, has a soft rubber inlet center pipe 21 passing through the center of the two end faces of the cylinder, and the height of the soft rubber inlet plug 2 is higher than the height of the solidified hard rubber, and the end of the soft rubber inlet center pipe 21 protruding from the end face of the soft rubber inlet plug 2;

[0057] The soft glue inlet plug 2 is arranged at the center of the hard glue containing recess 12 on the side of the casting plate 1 facing the membrane shell, the soft glue inlet pipe 3 is communicated with the soft glue inlet center pipe 21 of the soft glue inlet plug 2 through the soft glue inlet through hole 10 on the casting plate 1, and the soft glue inlet pipe 3 is arranged on the soft glue inlet through hole 10 through the first hexagonal flange face locking nut, and the hard glue inlet pipe 4 is arranged on the hard glue inlet through hole 11 through the first hexagonal flange face locking nut, and the model of the first hexagonal flange face locking nut is GB / T 6187.2-2016 [2 type full metal hexagonal flange face locking nut fine tooth M16x1.5].

[0058] The double-layer centrifugal casting clamp in the embodiment is made of 6061 aluminum, which is lighter than the ordinary clamp made of stainless steel on the market, reduces the centrifugal resistance, effectively reduces the energy consumption, and the Teflon surface layer can be effectively separated from the epoxy resin as the hard glue, reduces the quality problem of casting glue layer rupture caused by difficult demolding, and improves the demolding qualified rate from 85% to 99%.

[0059] Embodiment 2

[0060] As shown in Figures 5 to 8 A double-layer centrifugal casting clamp for a column type hollow fiber membrane module is used for water inlet casting, and the structure and material of the double-layer centrifugal casting clamp are basically the same as those of embodiment 1, and the difference lies in that it further comprises six casting rods 14.

[0061] The casting rod 14 is made of 6061 aluminum and has a Teflon surface layer, one end of which is conical and the other end is the assembly end.

[0062] The six casting rods 14 are arranged in the hard glue containing recess 12 on the side of the casting plate 1 facing the membrane shell, and are evenly arranged around the soft glue inlet plug 2, and the assembly end is arranged on the casting plate 1 through the second hexagonal flange face locking nut, and the model of the second hexagonal flange face locking nut is GB / T 6187.2-2016 [2 type full metal hexagonal flange face locking nut fine tooth M8x1].

[0063] Embodiment 3

[0064] As shown in Figure 9 A column type membrane module centrifugal casting method, comprising the following steps:

[0065] (1) About 10,000 hollow fiber membrane filaments are evenly bundled into six membrane filament bundles and fixed on the center pipe support of the membrane shell 8, the membrane shell 8 is hung on the stainless steel fixed support after passing through the membrane filament bundle, the tail of the hollow fiber membrane filament is exposed about 10 cm, the exposed tail is cut off along the edge of the end of the membrane shell 8 with a cutter, and the port of all the hollow fiber membrane filaments is ensured to be flush and open.

[0066] (2) AsFigure 10 As shown in FIG. 6, the double-layered centrifugal casting jig of Example 2 is assembled with the water distribution frame 7 having six partitions 71 of the same size, and the six casting rods 14 are inserted into the center of the six membrane filaments respectively, and the water inlet end of each membrane filament is arranged in each partition 71 respectively. After confirming that the positions are accurate and the hollow fiber membranes are not damaged, the water inlet end of the membrane filament in each partition 71 is fixed by a six-plate buckle (not shown in the figure), and the double-layered centrifugal casting jig of Example 2 is fastened to the water inlet end of the membrane shell 8 by a clamp (not shown in the figure).

[0067] (3) The assembly formed in step (2) is taken off and placed horizontally on the operation table, and the hollow fiber membranes at the water outlet end are cut flat. The port of the cut hollow fiber membranes is temporarily sealed by uniformly coating with 706 room temperature vulcanizing silicone. After the 706 room temperature vulcanizing silicone is completely cured and dried, the double-layered centrifugal casting jig of Example 1 is installed, as shown in FIG. 5. The double-layered centrifugal casting jig of Example 1 is also assembled with the water distribution frame 7 having six partitions 71 of the same size, and the water outlet end of each membrane filament is arranged in each partition 71 respectively. After confirming that the positions are accurate and the hollow fiber membranes are not damaged, the water outlet end of the membrane filament in each partition 71 is fixed by a six-plate buckle (not shown in the figure), and the double-layered centrifugal casting jig of Example 1 is fastened to the water outlet end of the membrane shell 8 by a clamp (not shown in the figure). Figure 11

[0068] (4) The membrane assembly assembled in step (3) is placed horizontally into the horizontal centrifugal casting machine, and the center of gravity is adjusted to be located at the center of the rotating shaft of the horizontal centrifugal casting machine and clamped and fixed by a block provided in the horizontal centrifugal casting machine. The two glue pouring barrels 81 are connected to the hard glue pipes 4 at the water inlet end and the water outlet end respectively through hoses, and the length of the hoses should not exceed 50 cm. The hoses are fixed firmly by a pipe wrench or a hose clamp to avoid shaking during centrifugation.

[0069] (5) The prepared epoxy hard glue (model E6016-7) is added to the glue pouring barrel 81 at the water inlet end, and the same epoxy hard glue is also added to the glue pouring barrel 81 at the water outlet end. After the glue pouring barrel 81 support is fixed, it is checked again whether all nuts, clamps and hoses are fastened, the side door and the top cover of the horizontal centrifugal casting machine are closed, and the total casting time is set to 8 h.

[0070] (6) The horizontal centrifugal casting machine is started, and first runs at a low speed of 120 r / min for 3 min to preliminarily distribute the epoxy hard glue and remove air bubbles. Then the speed is increased to 250 r / min for high-speed centrifugation until the epoxy hard glue is completely cured.

[0071] ​(7) After the epoxy resin hard glue is cured, stop the horizontal centrifugal casting machine, remove the hose connected with the hard glue inlet pipe 4, quickly connect the hose to the soft glue inlet pipe 3, and add the prepared polyurethane soft glue (model RC970) into the second glue pouring barrel 81; restart the horizontal centrifugal casting machine, centrifuge at a speed of 200 r / min for 2 h, so that the polyurethane soft glue is injected from above the cured epoxy resin hard glue through the soft glue inlet center pipe 21 and uniformly flows to the roots of all hollow fiber membranes.

[0072] (8) After the polyurethane soft glue is cured, remove the membrane assembly and install it on a special cover pulling device. By using the low surface energy characteristics of the Teflon surface layer, slight rotation or axial knocking can realize complete separation of the glue layer and the double-layer centrifugal casting clamp. After demolding, the casting surfaces of the water inlet end and the water outlet end are flat, without cracks and residual glue. The soft glue layer effectively wraps the roots of the hollow fiber membranes, and the membrane assembly has excellent sealing performance.

[0073] The column type hollow fiber membrane assembly cast by the double-layer centrifugal casting clamp of embodiments 1 and 2 has high end face flatness, few bubbles, full protection of the membrane root, no water leakage phenomenon, stable product quality, and is suitable for large-scale industrial production.

[0074] The above is only a preferred embodiment of the present application, and therefore cannot limit the scope of the present application. Equivalent changes and modifications made in accordance with the scope and content of the present patent should still be within the scope of the present application.

Claims

1. A dual layer centrifugal cast jig for a columnar hollow fiber membrane module, characterized by: It comprises a casting disc, a soft glue inlet inner plug, a soft glue inlet pipe and a hard glue inlet pipe; The casting disc has a Teflon surface layer and is disc-shaped, with a soft glue inlet through hole in the center and a hard glue inlet through hole in the eccentric position, and a hard glue containing recess on the side facing the membrane shell, and a sealing ring on the edge of the hard glue containing recess; The soft glue inlet inner plug has a Teflon surface layer and is cylindrical, with a soft glue inlet center pipe passing through the center of the two ends of the cylinder, and the height of the soft glue inlet inner plug being higher than the height of the solidified hard glue; The soft glue inlet inner plug is installed in the center of the hard glue containing recess on the side of the casting disc facing the membrane shell, the soft glue inlet pipe is connected to the soft glue inlet center pipe of the soft glue inlet inner plug through the soft glue inlet through hole on the casting disc, and the soft glue inlet pipe is installed on the soft glue inlet through hole, and the hard glue inlet pipe is installed on the hard glue inlet through hole.

2. The dual layer spin-casting fixture of claim 1, wherein: The soft glue inlet pipe is installed on the soft glue inlet through hole by a first hexagonal flange face locking nut, and the hard glue inlet pipe is installed on the hard glue inlet through hole by a first hexagonal flange face locking nut.

3. The dual layer spin-casting fixture of claim 1, wherein: The casting disc is made of 6061 aluminum, and the soft glue inlet inner plug is made of 6061 aluminum.

4. The dual layer spin-casting fixture of claim 1, wherein: The end of the soft glue inlet center pipe facing the membrane shell protrudes from one end surface of the soft glue inlet inner plug.

5. The dual layer spin-casting fixture of any one of claims 1 to 4, wherein: It also comprises a plurality of casting rods, which are installed in the hard glue containing recess on the side of the casting disc facing the membrane shell and are evenly arranged around the soft glue inlet inner plug.

6. The dual layer spin-casting fixture of claim 5, wherein: The plurality of casting rods have a Teflon surface layer, one end is conical, and the other end is a fitting end which is installed on the casting disc.

7. The dual layer spin-casting fixture of claim 6, wherein: The fitting end of the plurality of casting rods is installed on the casting disc by a second hexagonal flange face locking nut.

8. A method of casting a column membrane module by centrifugation, characterized by: It comprises the following steps: (1) uniformly bind and fix a plurality of membrane filament bundles by bundling the hollow fiber membrane filaments on the center tube support of the membrane shell, hang the membrane shell after passing through the membrane filament bundles, and cut off the tail of the hollow fiber membrane filament exposed outside the membrane shell along the edge of the end of the membrane shell to ensure that the ports of all hollow fiber membrane filaments are flush and open; (2) assemble the double-layer centrifugal casting clamp according to any one of claims 5 to 7 with a plurality of partitioned water distribution frames of the same size, insert the plurality of casting rods into the center positions of the plurality of membrane filament bundles respectively, and install the water inlet end of each membrane filament bundle in each partition respectively, confirm the accurate position and no damage to the hollow fiber membrane filaments, enclose each partition with a plurality of buckling plates to fix the water inlet end of the membrane filament bundle, and then fasten the double-layer centrifugal casting clamp according to any one of claims 5 to 7 on the water inlet end of the membrane shell; (3) The assembly formed in step (2) is taken off and laid horizontally on an operating table, the hollow fiber membrane filaments at the water outlet end are cut flat, and the ports of the cut flat hollow fiber membrane filaments are temporarily sealed with silica gel. After the silica gel is completely cured and dried, the double-layer centrifugal casting clamp according to any one of claims 1 to 4 is installed, and the double-layer centrifugal casting clamp is also assembled with several water distribution frames with the same size of partitions, so that the water outlet end of each membrane filament bundle is respectively arranged in each partition. After confirming that the position is accurate and the hollow fiber membrane filaments are not damaged, several buckling plates are used to enclose the six partitions to fix the water outlet end of the membrane filament bundle, and then the double-layer centrifugal casting clamp according to any one of claims 1 to 4 is fastened on the water outlet end of the membrane shell; (4) The membrane assembly assembled in step (3) is horizontally placed in a horizontal centrifugal casting machine, and two glue pouring barrels are respectively connected to the hard glue inlet pipe at the water inlet end and the water outlet end through a hose, and are tightly fastened to avoid shaking during centrifugation; (5) Epoxy resin hard glue is added to the two glue pouring barrels, and the horizontal centrifugal casting machine is used for casting until the epoxy resin hard glue is completely cured; (6) After the epoxy resin hard glue is cured, the hose is connected to the soft glue inlet pipe, and the prepared polyurethane soft glue is added to the two glue pouring barrels; the horizontal centrifugal casting machine is restarted for casting; (7) After the polyurethane soft glue is completely cured, the double-layer centrifugal casting clamp at the water inlet end and the water outlet end is removed.

9. A method of centrifugal casting a column membrane module according to claim 8, characterized in that: In step (5), the epoxy resin hard glue is initially distributed and the air bubbles are removed at a low speed of 100-130 r / min, and then the speed is increased to 200-300 r / min for high-speed centrifugation.

10. A method of centrifugal casting a columnar membrane module according to claim 8, wherein: In step (6), the polyurethane soft glue is injected from above the cured epoxy resin hard glue through the soft glue inlet center pipe and uniformly flows to the roots of all hollow fiber membrane filaments at a speed of 180-220 r / min.

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