Forming device and method for processing silicon nitride ceramic membrane

Abstract

The invention relates to the technical field of inorganic non-metallic materials, in particular to a forming device and method for processing a silicon nitride ceramic membrane, and the forming device for processing the silicon nitride ceramic membrane comprises a tank body and a tank cover; the tank cover is positioned on the top of the tank; the device further comprises a preparation assembly. The preparation assembly comprises a feeding channel, a feeding hopper, a valve plate, a stirring mechanism and a periodic driving mechanism; when the membrane layer slurry is prepared, after water is added into the tank body, the stirring mechanism is started, then needed powder raw materials are poured into the feeding hopper, the feeding hopper, the periodic driving mechanism, the valve plate and the feeding channel are matched, the powder raw materials are periodically added into the tank body, a part of the powder raw materials are added in each period to be mixed and stirred, and the membrane layer slurry is prepared. The phenomenon that the powder raw materials are caked and cannot be uniformly stirred due to addition of too much powder raw materials at a time is avoided, so that the problem that the film slurry cannot be uniformly stirred due to the caking phenomenon during preparation of the film slurry in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of inorganic non-metallic materials, and particularly relates to a forming device and method for processing silicon nitride ceramic membranes. Background Art

[0002] Ceramic membranes are porous thin films made of inorganic ceramic materials and are widely used in the separation, filtration, and purification of liquids or gases. They are known for their excellent chemical stability, thermal stability, and mechanical strength, and are suitable for applications in various harsh environments.

[0003] A preparation method of a silicon nitride-bonded silicon carbide porous ceramic membrane in the prior art includes the forming of a green body: after mixing metal silicon powder, silicon carbide powder, low-density polyethylene, dibutyl phthalate, and yttrium oxide in a certain mass ratio, extruding and forming a multi-channel tubular green body; the coating of the membrane layer: mixing water, metal silicon powder, silicon carbide powder, cellulose ether, and yttrium oxide in a certain mass ratio evenly to obtain a membrane layer slurry, injecting the membrane layer slurry into the channels of the prepared multi-channel tubular green body to obtain a silicon carbide body; finally, drying and sintering the prepared silicon carbide body to finally obtain a silicon nitride-bonded silicon carbide porous ceramic membrane material.

[0004] However, in the above method, when preparing the membrane layer slurry, water needs to be added to the stirring tank first, and then metal silicon powder, silicon carbide powder, cellulose ether, and yttrium oxide are added to the stirring tank and stirred and mixed evenly. Since metal silicon powder, silicon carbide powder, cellulose ether, and yttrium oxide are all in powder form, when a large amount of powder is added at one time, due to the barrier formed by the rapid wetting of the powder surface and local supersaturation and other reasons, caking is likely to occur. If the caking cannot be dispersed, it will lead to uneven stirring. Summary of the Invention

[0005] The purpose of the present invention is to provide a forming device and method for processing silicon nitride ceramic membranes, aiming to solve the problem that in the prior art, uneven stirring is likely to occur due to caking when preparing the membrane layer slurry.

[0006] To achieve the above purpose, in the first aspect, the present invention provides a forming device for processing silicon nitride ceramic membranes, including a tank body and a tank cover; the tank cover is located at the top of the tank body;

[0007] It further includes a preparation component;

[0008] The preparation component includes a feed channel, a feed hopper, a valve plate, a stirring mechanism, and a periodic driving mechanism;

[0009] The feed channel is connected and arranged at the top of the tank cover; the feed hopper is connected and arranged at the top of the feed channel; the valve plate is slidably connected to the feed channel and passes through the feed channel; the stirring mechanism is arranged on the tank cover and located inside the tank body; the periodic driving mechanism is arranged on the side of the valve plate and is used to drive the valve plate to slide reciprocally periodically.

[0010] Among them, the stirring mechanism includes a stirring shaft, a plurality of stirring blades, a mounting frame and a stirring motor;

[0011] The stirring shaft is rotatably arranged on the tank cover and passes through the tank cover; a plurality of the stirring blades are respectively fixedly arranged on the stirring shaft; the mounting frame is fixedly arranged on the top of the tank cover; the stirring motor is fixedly arranged on the top of the mounting frame, and the output end of the stirring motor is fixedly connected to the stirring shaft.

[0012] Among them, the stirring mechanism further includes two brackets and two scraping plates;

[0013] The two brackets are respectively fixedly arranged on the side of the stirring shaft; the two scraping plates are respectively fixedly arranged on the two brackets.

[0014] Among them, the periodic driving mechanism includes a first rotating shaft, a dial block, a fixed shaft, a dial rod, a column, a driving member and an elastic reset member;

[0015] The first rotating shaft is rotatably arranged on the top of the tank cover; the dial block is fixedly arranged on the top of the first rotating shaft; the fixed shaft is fixedly arranged on the top of the tank cover; the dial rod is rotatably arranged on the fixed shaft; the column is fixedly arranged on one side of the valve plate; the driving member is arranged above the tank cover and is used to drive the first rotating shaft to rotate; the elastic reset member is arranged on the side of the feed channel and is used to give the valve plate a reset pulling force.

[0016] Among them, the driving member includes a second rotating shaft, a first belt pulley, a second belt pulley, a third belt pulley, a fourth belt pulley, a first transmission belt and a second transmission belt;

[0017] The second rotating shaft is rotatably arranged on the top of the tank cover; the first belt pulley is fixedly arranged on the stirring shaft; the second belt pulley is fixedly arranged on the second rotating shaft; the third belt pulley is fixedly arranged on the second rotating shaft; the fourth belt pulley is fixedly arranged on the first rotating shaft; the first transmission belt is arranged on the first belt pulley and the second belt pulley; the second transmission belt is arranged on the third belt pulley and the fourth belt pulley.

[0018] Among them, the elastic reset member includes two first mounting plates, two second mounting plates and two tension springs;

[0019] The two first mounting plates are respectively fixedly arranged on one side of the valve plate; the two second mounting plates are respectively fixedly arranged on one side of the feed channel; a tension spring is fixedly arranged between the first mounting plate and the second mounting plate on the same side.

[0020] In a second aspect, the present invention also provides a forming method for processing a silicon nitride ceramic membrane, comprising:

[0021] After mixing metal silicon powder, silicon carbide powder, low-density polyethylene, dibutyl phthalate, and yttrium oxide in a certain mass ratio, put them into an extrusion molding machine to form a multi-channel tubular green body.

[0022] Add water to the tank body, then pour the metal silicon powder, silicon carbide powder, cellulose ether, and yttrium oxide prepared according to the mass ratio into the feed hopper, start the stirring mechanism, and the raw materials in the feed hopper are periodically added into the tank body and mixed evenly with water to obtain a membrane layer slurry.

[0023] Inject the membrane layer slurry into the channels of the multi-channel tubular green body and let it flow for a period of time to obtain a silicon carbide green body.

[0024] Dry and sinter the silicon carbide green body in sequence to obtain a silicon nitride-bonded silicon carbide porous ceramic membrane.

[0025] In the forming device and method for processing a silicon nitride ceramic membrane of the present invention, the stirring mechanism is used to stir the raw materials in the tank body; when the valve plate is inserted into the feed pipe from one side of the feed channel, the feed channel is blocked and the feeding stops; when the valve plate is pulled out from the feed channel, normal feeding can be carried out; the periodic driving mechanism is used to drive the valve plate to reciprocate periodically, and when the valve plate is pulled out to the limit position, it does not detach from the feed channel; specifically: every once in a while, the periodic driving mechanism pulls the valve plate out of the feed channel, and after pulling it out to the limit position, it starts to slide the valve plate into the feed channel again. During the reciprocating sliding process of pulling out and inserting, a part of the powder raw materials in the feed hopper will fall into the tank body, and periodic addition of powder raw materials into the tank body can be realized; in this way, when preparing the membrane layer slurry, after adding water to the tank body, start the stirring mechanism, then pour the required powder raw materials into the feed hopper, and the feed hopper, the periodic driving mechanism, the valve plate, and the feed channel cooperate to realize periodic addition of powder raw materials into the tank body. A part of the powder raw materials is added in each cycle for mixing and stirring, and it will not cause caking and inability to stir evenly due to adding too much powder raw materials at one time, thus solving the problem in the prior art that it is easy to cause uneven stirring due to caking during the preparation of the membrane layer slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0027] Figure 1 It is a schematic structural diagram of the first embodiment of the present invention.

[0028] Figure 2 It is a right view of the first embodiment of the present invention.

[0029] Figure 3 is Figure 2 A cross-sectional view taken along the A-A direction.

[0030] Figure 4 is Figure 2 A cross-sectional view taken along the B-B direction.

[0031] Figure 5 It is a schematic structural diagram of the first embodiment of the present invention from another angle.

[0032] Figure 6 is Figure 5 A partial enlarged view of detail A.

[0033] Figure 7 It is a schematic structural diagram of the first embodiment of the present invention from another angle.

[0034] Figure 8 is Figure 7 A partial enlarged view of detail B.

[0035] Figure 9 It is a schematic flow chart of the second embodiment of the present invention.

[0036] 1 - tank body, 2 - tank cover, 3 - feed channel, 4 - feed hopper, 5 - valve plate, 6 - stirring mechanism, 7 - periodic drive mechanism, 61 - stirring shaft, 62 - stirring blade, 63 - mounting frame, 64 - stirring motor, 65 - support, 66 - scraper, 71 - first rotating shaft, 72 - dial block, 73 - fixed shaft, 74 - dial rod, 75 - column, 76 - driving member, 77 - elastic reset member, 721 - dial block body, 722 - first contact wheel, 751 - column body, 752 - second contact wheel, 761 - second rotating shaft, 762 - first belt pulley, 763 - second belt pulley, 764 - third belt pulley, 765 - fourth belt pulley, 766 - first transmission belt, 767 - second transmission belt, 771 - first mounting plate, 772 - second mounting plate, 773 - tension spring. Detailed implementation manners

[0037] The first embodiment of the present application is as follows:

[0038] Please refer to Figures 1 - 8 , wherein, Figure 1It is a schematic structural diagram of the first embodiment of the present invention. Figure 2 It is a right view of the first embodiment of the present invention. Figure 3 It is Figure 2 A sectional view taken along the direction of A-A. Figure 4 It is Figure 2 A sectional view taken along the direction of B-B. Figure 5 It is a schematic structural diagram of another angle of the first embodiment of the present invention. Figure 6 It is Figure 5 An enlarged partial view of detail A. Figure 7 It is a schematic structural diagram of another angle of the first embodiment of the present invention. Figure 8 It is Figure 7 An enlarged partial view of detail B.

[0039] The present invention provides a forming device for processing a silicon nitride ceramic membrane: including a tank body 1 and a tank cover 2; further including a preparation component; the preparation component includes a feed channel 3, a feed hopper 4, a valve plate 5, a stirring mechanism 6 and a periodic driving mechanism 7; the stirring mechanism 6 includes a stirring shaft 61, a plurality of stirring blades 62, a mounting frame 63 and a stirring motor 64; the stirring mechanism 6 further includes two brackets 65 and two scraping plates 66; the periodic driving mechanism 7 includes a first rotating shaft 71, a dial block 72, a fixed shaft 73, a dial rod 74, a column 75, a driving member 76 and an elastic reset member 77; the driving member 76 includes a second rotating shaft 761, a first belt pulley 762, a second belt pulley 763, a third belt pulley 764, a fourth belt pulley 765, a first transmission belt 766 and a second transmission belt 767; the elastic reset member 77 includes two first mounting plates 771, two second mounting plates 772 and two tension springs 773; the dial block 72 includes a dial block body 721 and a first contact wheel 722; the column 75 includes a column body 751 and a second contact wheel 752; through the foregoing solution, the problem that in the prior art, when preparing the membrane layer slurry, it is easy to cause uneven stirring due to caking is solved.

[0040] Furthermore, the tank cover 2 is located at the top of the tank body 1; the feed channel 3 is communicatively provided at the top of the tank cover 2; the feed hopper 4 is communicatively provided at the top of the feed channel 3; the valve plate 5 is slidably connected to the feed channel 3 and passes through the feed channel 3; the stirring mechanism 6 is provided on the tank cover 2 and is located inside the tank body 1; the periodic driving mechanism 7 is provided on the side of the valve plate 5 for driving the valve plate 5 to slide periodically back and forth.

[0041] In this embodiment, the stirring mechanism 6 is used to stir the raw materials in the tank body 1; when the valve plate 5 is inserted into the feed pipe from one side of the feed channel 3, the feed channel 3 is blocked and the feeding stops; when the valve plate 5 is pulled out of the feed channel 3, normal feeding can be carried out; the periodic driving mechanism 7 is used to drive the valve plate 5 to slide reciprocally periodically, and when the valve plate 5 is pulled out to the limit position, it does not detach from the feed channel 3; specifically: every once in a while, the periodic driving mechanism 7 pulls the valve plate 5 out of the feed channel 3, and after pulling it to the limit position, it starts to slide the valve plate 5 into the feed channel 3. During the reciprocating sliding process of pulling out and inserting, a part of the powder raw materials in the feed hopper 4 will fall into the tank body 1, and periodic addition of powder raw materials into the tank body 1 can be realized; in this way, when preparing the film layer slurry, after adding water into the tank body 1, the stirring mechanism 6 is started, and then the required powder raw materials are poured into the feed hopper 4. The feed hopper 4, the periodic driving mechanism 7, the valve plate 5 and the feed channel 3 cooperate to realize periodic addition of powder raw materials into the tank body 1. A part of the powder raw materials is added into the mixture and stirred every cycle, and it will not cause caking and inability to stir evenly due to adding too much powder raw materials at one time, thus solving the problem in the prior art that it is easy to cause uneven stirring due to caking during the preparation of the film layer slurry.

[0042] Further, the stirring mechanism 6 includes a stirring shaft 61, a plurality of stirring blades 62, a mounting frame 63 and a stirring motor 64;

[0043] The stirring shaft 61 is rotatably arranged on the tank cover 2 and passes through the tank cover 2; a plurality of the stirring blades 62 are respectively fixedly arranged on the stirring shaft 61; the mounting frame 63 is fixedly arranged on the top of the tank cover 2; the stirring motor 64 is fixedly arranged on the top of the mounting frame 63, and the output end of the stirring motor 64 is fixedly connected with the stirring shaft 61.

[0044] In this embodiment, the mounting frame 63 is used to mount the stirring motor 64. The upper end of the stirring shaft 61 passes through the tank cover 2 and is connected to the output end of the stirring motor 64; the stirring motor 64 drives the stirring shaft 61 to rotate, the stirring shaft 61 drives a plurality of the stirring blades 62 to rotate, and a plurality of the stirring blades 62 mix water and powder raw materials evenly to prepare the film layer slurry.

[0045] Further, the stirring mechanism 6 further includes two brackets 65 and two scraping plates 66;

[0046] The two brackets 65 are respectively fixedly arranged on the side of the stirring shaft 61; the two scraping plates 66 are respectively fixedly arranged on the two brackets 65.

[0047] In this embodiment, the two brackets 65 are located on both sides of the stirring shaft 61, and are used to support the two scrapers 66. The two scrapers 66 are in contact with the inner wall of the tank body 1. When rotating, they are used to scrape off the raw materials adhering to the inner wall of the tank body 1 and mix them evenly with water.

[0048] Furthermore, the periodic driving mechanism 7 includes a first rotating shaft 71, a shifting block 72, a fixed shaft 73, a shifting rod 74, a column 75, a driving member 76 and an elastic reset member 77;

[0049] The first rotating shaft 71 is rotatably arranged on the top of the tank cover 2; the shift block 72 is fixedly arranged on the top of the first rotating shaft 71; the fixed shaft 73 is fixedly arranged on the top of the tank cover 2; the shift rod 74 is rotatably arranged on the fixed shaft 73; the column 75 is fixedly arranged on one side of the valve plate 5; the driving member 76 is arranged above the tank cover 2, and is used to drive the first rotating shaft 71 to rotate; the elastic reset member 77 is arranged on the side of the feed channel 3, and is used to give the valve plate 5 a reset pulling force.

[0050] In this embodiment, the driving member 76 is used to drive the first rotating shaft 71 to rotate, thereby driving the shift block 72 to rotate; one end of the shift rod 74 is located on the side of the column 75, and the other end is located on the side of the shift block 72; during the counterclockwise rotation of the shift block 72, it will contact the shift rod 74 at a certain position, and then push the shift rod 74 close to one end of the shift block 72. After a period of contact, it will break away from the shift rod 74 at a certain position and stagger with each other; the elastic return member 77 applies a pulling force to the valve plate 5, so that the valve plate 5 has a tendency to slide into the feed channel 3; during the counterclockwise rotation of the shift block 72, it contacts the shift rod 74 When the lever 74 is in the closed position, the lever 74 will gradually move closer to one end of the lever block 72. The lever 74 rotates around the fixed shaft 73, and the other end pushes the column 75 to gradually move away from the feed channel 3. The column 75 drives the valve plate 5 to gradually slide out of the feed channel 3. At this time, the elastic return member 77 accumulates elastic potential energy, and the lever block 72 continues to rotate until it is disengaged from the lever 74. The lever 74 no longer applies force to the column 75, and the elastic return member 77 pulls the valve plate 5 and slides it back into the feed slideway. The column 75 also pushes the lever 74 close to one end of the column 75, causing the lever 74 to rotate and reset.

[0051] In this way, during the process of the shift block 72 continuously rotating one circle counterclockwise, there will be a period of time when the shift block 72 is staggered from contacting with the shift rod 74 to disengaging from the shift rod 74. During this period of time, the valve plate 5 undergoes a reciprocating sliding process. During this process, a part of the powder raw material will smoothly pass through the feed channel 3 into the tank body 1, realizing periodic feeding.

[0052] Furthermore, the driving member 76 includes a second rotating shaft 761 , a first pulley 762 , a second pulley 763 , a third pulley 764 , a fourth pulley 765 , a first transmission belt 766 and a second transmission belt 767 ;

[0053] The second rotating shaft 761 is rotatably set on the top of the tank cover 2; the first pulley 762 is fixedly set on the stirring shaft 61; the second pulley 763 is fixedly set on the second rotating shaft 761; the third pulley 764 is fixedly set on the second rotating shaft 761; the fourth pulley 765 is fixedly set on the first rotating shaft 71; the first transmission belt 766 is set on the first pulley 762 and the second pulley 763; the second transmission belt 767 is set on the third pulley 764 and the fourth pulley 765.

[0054] In this embodiment, the stirring shaft 61 rotates to drive the first pulley 762, and the first pulley 762 drives the second pulley 763 through the first transmission belt 766. The second pulley 763 drives the second rotating shaft 761 to rotate, and the second rotating shaft 761 drives the third pulley 764 to rotate. The third pulley 764 drives the fourth pulley 765 through the second transmission belt 767, and the fourth pulley 765 drives the first rotating shaft 71 to rotate, and the first rotating shaft 71 drives the shift block 72 to rotate. Since the first pulley 762 is smaller than the second pulley 763 and the third pulley 764 is smaller than the fourth pulley 765, the stirring shaft 61 rotates several times and the first rotating shaft 71 rotates one circle. Therefore, after each portion of powder raw material is added, the stirring shaft 61 must drive the multiple stirring blades 62 to stir several times before the next portion of powder raw material is added. In this way, each time a portion of powder raw material is added, it can be stirred evenly.

[0055] Furthermore, the elastic return member 77 includes two first mounting plates 771 , two second mounting plates 772 and two tension springs 773 ;

[0056] The two first mounting plates 771 are fixedly arranged on one side of the valve plate 5; the two second mounting plates 772 are fixedly arranged on one side of the feed channel 3; a tension spring 773 is fixedly arranged between the first mounting plate 771 and the second mounting plate 772 on the same side.

[0057] In this embodiment, when the column 75 is pushed by the lever 74 and the valve plate 5 is pulled out of the feed channel 3, the two tension springs 773 are stretched to store elastic potential energy. When the column 75 is no longer pushed by the lever 74, the two tension springs 773 immediately contract to pull the valve plate 5 and insert it back into the feed channel 3.

[0058] Furthermore, the dial block 72 includes a dial block body 721 and a first contact wheel 722;

[0059] The dial block body 721 is fixedly arranged at the top of the first rotating shaft 71; the first contact wheel 722 is rotatably arranged on one side of the dial block body 721.

[0060] In this embodiment, the first contact wheel 722 is provided to reduce the frictional force when contacting the lever 74, making the mechanism operate smoothly.

[0061] Furthermore, the column 75 includes a column body 751 and a second contact wheel 752;

[0062] The column body 751 is fixedly arranged on one side of the valve plate 5; the second contact wheel 752 is rotatably arranged on the column body 751.

[0063] In this embodiment, the second contact wheel 752 is provided to reduce the frictional force when contacting the lever 74, making the mechanism operate smoothly.

[0064] A forming device for processing silicon nitride ceramic membranes according to this embodiment. The stirring mechanism 6 is used to stir the raw materials in the tank body 1. When the valve plate 5 is inserted into the feed pipe from one side of the feed channel 3, the feed channel 3 is blocked and the feeding stops. When the valve plate 5 is pulled out of the feed channel 3, normal feeding can be carried out. The periodic driving mechanism 7 is used to drive the valve plate 5 to slide reciprocally periodically. When the valve plate 5 is pulled out to the limit position, it does not detach from the feed channel 3. Specifically, every once in a while, the periodic driving mechanism 7 pulls the valve plate 5 out of the feed channel 3. After pulling it out to the limit position, it starts to slide the valve plate 5 into the feed channel 3 again. During the reciprocating sliding process of pulling out and inserting, a part of the powder raw materials in the feed hopper 4 will fall into the tank body 1, and periodic addition of powder raw materials into the tank body 1 can be achieved. In this way, when preparing the membrane layer slurry, after adding water to the tank body 1, the stirring mechanism 6 is started, and then the required powder raw materials are poured into the feed hopper 4. The feed hopper 4, the periodic driving mechanism 7, the valve plate 5 and the feed channel 3 cooperate to achieve periodic addition of powder raw materials into the tank body 1. A part of the powder raw materials is added in each cycle for mixing and stirring, and it will not cause caking and inability to stir evenly due to adding too much powder raw materials at one time, thus solving the problem in the prior art that it is easy to cause uneven stirring due to caking when preparing the membrane layer slurry.

[0065] The second embodiment of this application is:

[0066] On the basis of the first embodiment, please refer to Figure 9 , where Figure 9 is the process schematic diagram of the second embodiment of the present invention.

[0067] A forming method for processing silicon nitride ceramic membranes provided by the present invention includes:

[0068] S1 Mix metal silicon powder, silicon carbide powder, low-density polyethylene, dibutyl phthalate, and yttrium oxide in a certain mass ratio, and put them into an extrusion molding machine to form a multi-channel tubular green body.

[0069] S2 Add water to the tank body 1, and then pour the metal silicon powder, silicon carbide powder, cellulose ether, and yttrium oxide prepared according to the mass ratio into the feed hopper 4. Start the stirring mechanism 6, and the raw materials in the feed hopper 4 are periodically added into the tank body 1 and mixed evenly with water to obtain the membrane layer slurry.

[0070] S3 Inject the membrane layer slurry into the channels of the multi-channel tubular green body and let it flow for a period of time to obtain a silicon carbide green body.

[0071] S4 Dry and sinter the silicon carbide green body in sequence to obtain a silicon nitride-bonded silicon carbide porous ceramic membrane.

[0072] The above disclosure is only one or more preferred embodiments of the present application, and the scope of rights of the present application cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. A forming device for processing silicon nitride ceramic membranes, comprising a tank body and a tank cover; the tank cover is located on the top of the tank body; characterized in that: Also included are preparation components; The preparation assembly includes a feed channel, a feed hopper, a valve plate, a stirring mechanism and a periodic driving mechanism; The feed channel is connected to the top of the tank cover; the feed hopper is connected to the top of the feed channel; the valve plate is slidably connected to the feed channel and passes through the feed channel; the stirring mechanism is provided on the tank cover and is located inside the tank body; the periodic driving mechanism is provided on the side of the valve plate, for driving the valve plate to slide back and forth periodically.

2. A forming device for processing a silicon nitride ceramic film according to claim 1, characterized in that: The stirring mechanism includes a stirring shaft, a plurality of stirring blades, a mounting frame and a stirring motor; The stirring shaft is rotatably arranged on the tank cover and passes through the tank cover; the multiple stirring blades are respectively fixedly arranged on the stirring shaft; the mounting frame is fixedly arranged on the top of the tank cover; the stirring motor is fixedly arranged on the top of the mounting frame, and the output end of the stirring motor is fixedly connected to the stirring shaft.

3. A forming device for processing a silicon nitride ceramic film according to claim 2, characterized in that: The stirring mechanism also includes two brackets and two scrapers; The two brackets are respectively fixedly arranged on the sides of the stirring shaft; and the two scrapers are respectively fixedly arranged on the two brackets.

4. A forming device for processing a silicon nitride ceramic film according to claim 3, characterized in that: The periodic driving mechanism includes a first rotating shaft, a shifting block, a fixed shaft, a shifting rod, a column, a driving member and an elastic reset member; The first rotating shaft is rotatably arranged on the top of the tank cover; the shift block is fixedly arranged on the top of the first rotating shaft; the fixed shaft is fixedly arranged on the top of the tank cover; the shift rod is rotatably arranged on the fixed shaft; the column is fixedly arranged on one side of the valve plate; the driving member is arranged above the tank cover, and is used to drive the first rotating shaft to rotate; the elastic reset member is arranged on the side of the feed channel, and is used to give the valve plate a reset pulling force.

5. A forming device for processing a silicon nitride ceramic film according to claim 4, characterized in that: The driving member includes a second rotating shaft, a first pulley, a second pulley, a third pulley, a fourth pulley, a first transmission belt and a second transmission belt; The second rotating shaft is rotatably arranged on the top of the tank cover; the first pulley is fixedly arranged on the stirring shaft; the second pulley is fixedly arranged on the second rotating shaft; the third pulley is fixedly arranged on the second rotating shaft; the fourth pulley is fixedly arranged on the first rotating shaft; the first transmission belt is arranged on the first pulley and the second pulley; the second transmission belt is arranged on the third pulley and the fourth pulley.

6. A forming device for processing a silicon nitride ceramic film according to claim 5, characterized in that: The elastic reset member includes two first mounting plates, two second mounting plates and two tension springs; Two of the first mounting plates are respectively fixedly arranged on one side of the valve plate; two of the second mounting plates are respectively fixedly arranged on one side of the feed channel; one of the tension springs is fixedly arranged between the first mounting plate and the second mounting plate on the same side.

7. A forming method for processing a silicon nitride ceramic membrane, using a forming device for processing a silicon nitride ceramic membrane according to any one of claims 1 to 6, characterized in that, Comprising: Mix metal silicon powder, silicon carbide powder, low-density polyethylene, dibutyl phthalate, and yttrium oxide in a certain mass ratio, and then put them into an extrusion molding machine to form a multi-channel tubular green body. Add water to the tank body, and then pour the metal silicon powder, silicon carbide powder, cellulose ether, and yttrium oxide prepared according to the mass ratio into the feed hopper. Start the stirring mechanism, and the raw materials in the feed hopper are periodically added to the tank body and mixed evenly with water to obtain a film layer slurry. Inject the film layer slurry into the channels of the multi-channel tubular green body and let it flow for a period of time to obtain a silicon carbide green body. Dry and sinter the silicon carbide green body in sequence to obtain a silicon nitride-bonded silicon carbide porous ceramic membrane.

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