Production device of silicon nitride ceramic body

Abstract

The invention discloses a silicon nitride ceramic body production device, and relates to the field of silicon nitride ceramic processing, the silicon nitride ceramic body production device comprises a base, the top of the base is sequentially and fixedly provided with a material receiving seat, a pressing seat, a sintering furnace and a cooling box, the two sides of the pressing seat are respectively provided with a conveying belt mechanism, and the top of the material receiving seat is provided with a preheating cylinder; and a heating plate is movably arranged at the bottom of the preheating cylinder and above the material receiving seat. The silicon powder in the preheating cylinder is preheated and dried through the preheating cylinder, the positioning plate is pushed to the position below the preheating cylinder through the conveying belt mechanism, the silicon powder in the preheating cylinder is filled into a material groove in the surface of the positioning plate to complete feeding, then the positioning plate is moved to the position above the pressing base through the conveying belt mechanism, and the silicon powder is pressed through the pressing columns on the pressing plate; and in the pressing process, the positioning seat is matched with the pressing columns under the action of the chain transmission mechanism, so that the misaligned pressing columns can be eliminated, and the subsequent sintering quality of the silicon nitride ceramic body is ensured.

Description

Technical Field

[0001] The invention relates to the field of silicon nitride ceramic processing, in particular to a production device for a silicon nitride ceramic body. Background Art

[0002] Silicon nitride ceramics are an inorganic ceramic material that does not shrink during sintering. Silicon nitride has high strength, especially hot-pressed silicon nitride, which is one of the hardest substances in the world. It has high strength, low density, and high temperature resistance. As an excellent high-temperature engineering material, its greatest advantage lies in its application in high-temperature fields.

[0003] Silicon nitride ceramics use silicon powder as raw material. It is first formed into the desired shape using the usual molding method, and then initially nitrided in nitrogen at a high temperature of 1200°C so that part of the silicon powder reacts with nitrogen to form silicon nitride. At this time, the entire body has a certain strength. Then it is subjected to a second nitridation in a high-temperature furnace at 1350°C to 1450°C to react into silicon nitride.

[0004] It is very necessary to keep silicon powder and subsequent sintering additives dry. When the moisture content inside the silicon powder is high, the moisture will affect the fluidity of the powder during the pressing process and the stability after pressing. Too high moisture content can easily lead to defects such as bubbles and bulging after pressing, thus affecting the quality and use of the product.

[0005] Therefore, before pressing the silicon powder, it is necessary to dry the silicon powder. The common drying process is generally to put the silicon powder into a drying cylinder for stirring and drying, and then put the dried silicon powder into a mold for pressing. However, for some small silicon nitride ceramic bodies, there are often a large number of pressing grooves on a mold. When the silicon powder is poured in, the pressing groove cannot be completely filled with silicon powder. At this time, pressing will lead to a decrease in the quality of subsequent products. Summary of the invention

[0006] Based on this, the purpose of the present invention is to provide a production device for silicon nitride ceramic bodies to solve the technical problem of reduced sintering quality of general silicon nitride ceramics.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a production device for a silicon nitride ceramic body, comprising a base, a material receiving seat, a pressing seat, a sintering furnace and a cooling box are fixedly arranged on the top of the base in sequence, conveyor belt mechanisms are respectively arranged on both sides of the pressing seat, a preheating cylinder is installed on the top of the material receiving seat, and a heating plate is movably arranged on the bottom of the preheating cylinder above the material receiving seat, a positioning plate is arranged on the surface of the conveyor belt mechanism, and a material trough is provided on the surface of the positioning plate, a hydraulic cylinder is installed on the top of the pressing seat, and a pressing plate is connected to the movable end of the hydraulic cylinder, a plurality of pressing columns are connected to the interior of the pressing plate by a buckle, a plurality of positioning seats are rotatably arranged inside the pressing plate, the positioning seats are connected and rotated by a chain transmission mechanism, a groove is provided on the outer wall of the pressing column, and the positioning seat and the groove cooperate with each other.

[0008] The present invention is further configured such that the interior of the heating plate is rotatably connected to a telescopic rod via a torsion spring shaft, one end of the telescopic rod is rotatably connected to a ramp block, and the other end is rotatably connected to a first plug block, the inner wall of the material receiving seat is provided with a positioning groove that matches the ramp block, the inner wall of the heating plate is located directly opposite to the first plug block and is connected to a second plug block via a reset spring, and a positioning block that matches the first plug block and the second plug block is provided on one side of the positioning plate.

[0009] The present invention is further configured such that a stirring mechanism is provided inside the preheating cylinder, the stirring mechanism comprises a rotating motor and a stirring blade, the rotating motor is installed above the preheating cylinder through a connecting rod, and the output end of the rotating motor is connected to the stirring blade.

[0010] The present invention is further configured such that a guide rail is provided on the top of the material receiving seat, the heating plate moves back and forth along the guide rail, and the top of the heating plate is tightly fitted with the preheating cylinder.

[0011] The present invention is further configured such that the movable end of the hydraulic cylinder is connected to a mounting seat, the pressing plate is arranged below the mounting seat through a connecting column, and a gap is arranged between the mounting seat and the pressing plate.

[0012] The present invention is further configured such that the chain transmission mechanism comprises an upper chain and a lower chain, and the upper chain and the lower chain are respectively meshed with sprockets at the top and bottom of the positioning seat.

[0013] The present invention is further configured such that a screw feeder is installed on one side of the material receiving seat, the feed port of the screw feeder is connected to the bottom discharge port of the material receiving seat, and the discharge port of the screw feeder is directly opposite to the top of the preheating cylinder.

[0014] The present invention is further configured such that a bellows is installed on the top of the cooling box, an air outlet of the bellows is connected to the cooling box through a pipe, an arched channel is provided in the middle of the cooling box, and an air guide plate is provided inside the arched channel.

[0015] The present invention is further configured such that the conveyor belt mechanism is a metal conveyor belt, a plurality of limit strips are arranged on the surface of the conveyor belt mechanism, and a limit groove matching with the limit strips is arranged at the bottom of the positioning plate.

[0016] The present invention is further configured such that a driving motor is installed on the top of the pressing plate, and the driving motor is connected to the sprocket of the positioning seat.

[0017] In summary, the present invention mainly has the following beneficial effects: the present invention preheats and dries the internal silicon powder through the preheating cylinder, and the conveyor belt mechanism pushes the positioning plate to the bottom of the preheating cylinder, and fills the silicon powder inside the preheating cylinder into the material groove on the surface of the positioning plate to complete the loading, and then the conveyor belt mechanism moves the positioning plate to the top of the pressing seat, and the pressing column on the pressing plate presses the silicon powder, and during the pressing process, the positioning seat cooperates with the pressing column under the action of the chain transmission mechanism, which can eliminate misaligned pressing columns, ensuring that the silicon powder in each material groove is pressed, so that the subsequent sintering quality of the silicon nitride ceramic body is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0019] Figure 2 It is a cross-sectional view of the internal structure of the cooling box of the present invention;

[0020] Figure 3 It is a schematic diagram of the internal structure of the pressing seat of the present invention;

[0021] Figure 4 It is a schematic diagram of the top structure of the material receiving seat of the present invention;

[0022] Figure 5 It is a schematic diagram of the top structure of the pressed plate of the present invention;

[0023] Figure 6 It is a schematic diagram of the bottom structure of the pressed plate of the present invention;

[0024] Figure 7 A cross-sectional view of the internal structure of a pressed plate of the present invention;

[0025] Figure 8 For the present invention Figure 4 A magnified view of the structure at A;

[0026] Fig. 9 For the present invention Figure 7 A magnified view of the structure at B;

[0027] Fig.10 For the present invention Figure 6 A magnified view of the structure at C;

[0028] Fig.11 It is a schematic diagram of the connection between the pressure column and the positioning seat of the present invention;

[0029] Fig.12 It is a schematic diagram of the connection between the pressure column and the spring piece of the pressing plate of the present invention.

[0030] In the figure: 1. base; 2. receiving seat; 3. screw feeder; 4. preheating cylinder; 5. stirring mechanism; 6. heating plate; 7. conveyor belt mechanism; 8. limit strip; 9. positioning plate; 10. pressing seat; 11. hydraulic cylinder; 12. mounting seat; 13. pressing plate; 14. air guide plate; 15. pressing column; 16. driving motor; 17. upper chain; 18. positioning seat; 19. groove; 20. lower chain; 21. positioning block; 22. inclined block; 23. telescopic rod; 24. torsion spring shaft; 25. first plug block; 26. second plug block; 27. reset spring; 28. sintering furnace; 29. ​​cooling box; 30. bellows; 31. arched channel. DETAILED DESCRIPTION

[0031] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] A production device for a silicon nitride ceramic body, such as Figure 1-12 As shown, it includes a base 1, a receiving seat 2 is fixedly arranged on the top of the base 1, a preheating cylinder 4 is installed on the top of the receiving seat 2, and the silicon powder is preheated and dried after entering the preheating cylinder 4, and the moisture in the silicon powder and the sintering additive is evaporated before pressing. The bottom of the preheating cylinder 4 is located above the receiving seat 2 and a heating plate 6 is movably arranged, and a stirring mechanism 5 is arranged inside the preheating cylinder 4. The stirring mechanism 5 includes a rotating motor and stirring blades. The rotating motor is installed above the preheating cylinder 4 through a connecting rod, and the output end of the rotating motor is connected to the stirring blade. After the silicon powder and the sintering additive fall into the preheating cylinder 4, they will be received by the heating plate 6. The heating plate 6 is a common electromagnetic heating plate, which can preheat and dry the silicon powder on the top of the heating plate 6. In conjunction with the stirring mechanism 5, it can effectively promote the complete drying of the overall silicon powder.

[0033] After the silicon powder is dried, it is ready to be loaded. The top of the base 1 is fixedly provided with a receiving seat 2, a pressing seat 10, a sintering furnace 28 and a cooling box 29 in sequence. Conveyor belt mechanisms 7 are respectively provided on both sides of the pressing seat 10. The conveyor belt mechanism 7 is a metal conveyor belt. The surface of the conveyor belt mechanism 7 is provided with a plurality of limit strips 8. The bottom of the positioning plate 9 is provided with a limit groove matched with the limit strip 8. Therefore, the positioning plate 9 can be directly inserted into the surface of the conveyor belt mechanism 7 along the side. The positioning plate 9 is first inserted into the surface of the conveyor belt mechanism 7 close to the receiving seat 2. At this time, the conveyor belt mechanism 7 is started, and the positioning plate 9 is moved toward the direction of the heating plate 6, and the heating plate 6 is pushed forward until the positioning plate 9 replaces the position of the heating plate 6 and is located at the bottom of the preheating tube 4. At this time, the silicon powder inside the preheating tube 4 directly falls on the top of the positioning plate 9, and the silicon powder at the bottom is well preheated and dried.

[0034] After the silicon powder falls on the top of the positioning plate 9, but does not completely fall into the material trough opened on the surface of the positioning plate 9, the conveyor belt mechanism 7 rotates in the opposite direction to transport the positioning plate 9 back to its original position. Since the positioning plate 9 is tightly fitted with the bottom of the preheating cylinder 4, the bottom of the preheating cylinder 4 serves as a scraper of the positioning plate 9, and the silicon powder on the top of the positioning plate 9 can be scraped into the material trough. A guide rail is provided on the top of the receiving seat 2, and the heating plate 6 moves back and forth along the guide rail, and the top of the heating plate 6 is tightly fitted with the preheating cylinder 4, and the receiving seat 2 is provided with a guide rail. The top of the seat 2 is a hollow structure, and the guide rail only serves to support and guide the heating plate 6 and the positioning plate 9. Therefore, after the positioning plate 9 completely leaves the preheating cylinder 4, the excess silicon powder will fall into the receiving seat 2. A screw feeder 3 is installed on one side of the receiving seat 2. The feed port of the screw feeder 3 is connected to the bottom discharge port of the receiving seat 2, and the discharge port of the screw feeder 3 is directly opposite to the top of the preheating cylinder 4. The silicon powder that falls into the receiving seat 2 will re-enter the preheating cylinder 4 through the screw feeder 3.

[0035] Furthermore, when the positioning plate 9 leaves the bottom of the preheating cylinder 4, the pushed heating plate 6 cannot return to its original position, so the positioning plate 9 is required to pull the heating plate 6 back when leaving. The interior of the heating plate 6 is rotatably connected to the telescopic rod 23 through the torsion spring shaft 24. One end of the telescopic rod 23 is rotatably connected to the inclined block 22, and the other end is rotatably connected to the first plug block 25. The inner wall of the material receiving seat 2 is provided with a positioning groove that matches the inclined block 22. The inner wall of the heating plate 6 is located directly opposite to the first plug block 25 and is connected to the second plug block 26 through a reset spring 27. A positioning block 21 that matches the first plug block 25 and the second plug block 26 is provided on one side of the positioning plate 9. When the positioning plate 9 contacts the heating plate 6 for the first time, the positioning block 21 is inserted into the interior of the heating plate 6, and the second plug block 26 is inserted into the When the positioning plate 9 pushes the heating plate 6 to move forward, the inclined block 22 moves out of the positioning groove, causing the telescopic rod 23 to rotate along the torsion spring shaft 24, and the first plug block 25 is inserted into the positioning block 21 until the positioning plate 9 and the heating plate 6 are pushed into place. Later, when the positioning plate 9 is transported back to its original position, the heating plate 6 will be pulled synchronously by the positioning plate 9 under the action of the first plug block 25 and the second plug block 26 until the inclined block 22 returns to the position of the positioning groove, the torsion spring shaft 24 returns the telescopic rod 23 to its place, the first plug block 25 leaves the positioning block 21, and the positioning plate 9 and the positioning block 21 are pulled out at the same time, and the second plug block 26 squeezes the reset spring 27 until the positioning block 21 is separated from the inside of the heating plate 6. At this time, the heating plate 6 is reset, and the positioning plate 9 can perform subsequent pressing work.

[0036] The positioning plate 9 after loading is brought to the position of the pressing seat 10 under the action of the conveyor belt mechanism 7, and is ready to carry out the corresponding pressing work. A hydraulic cylinder 11 is installed on the top of the pressing seat 10, and the movable end of the hydraulic cylinder 11 is connected to the mounting seat 12. The pressing plate 13 is arranged below the mounting seat 12 through a connecting column, and a gap is arranged between the mounting seat 12 and the pressing plate 13. The interior of the pressing plate 13 is connected to a plurality of pressing columns 15 through spring sheets, such as Fig.12 As shown, when the silicon powder inside the trough of the positioning plate 9 needs to be pressed, the hydraulic cylinder 11 is started, and the hydraulic cylinder 11 pushes the mounting seat 12 and the pressing plate 13 to move downward until the pressing column 15 is inserted into the trough;

[0037] The internal rotation of the pressing plate 13 is provided with a plurality of positioning seats 18, and the positioning seats 18 are connected and rotated by a chain transmission mechanism, and the chain transmission mechanism includes an upper chain 17 and a lower chain 20, and the upper chain 17 and the lower chain 20 are respectively meshed with the sprockets at the top and bottom of the positioning seat 18. A driving motor 16 is installed on the top of the pressing plate 13, and the driving motor 16 is connected to the sprocket of the positioning seat 18. A groove 19 is opened on the outer wall of the pressing column 15, and the positioning seat 18 and the groove 19 cooperate with each other. When the pressing column 15 is inserted into the material trough, the driving motor 16 is started, and the driving motor 16 drives the positioning seat 18 The top sprocket rotates, and the upper chain 17 rotates accordingly. The upper chain 17 rotates and drives the outer ring positioning seat 18 on the pressing plate 13 to rotate. When the outer ring positioning seat 18 rotates, the lower chain 20 meshes with the sprocket at the bottom of the positioning seat 18 and rotates, thereby driving all the positioning seats 18 to rotate, so that the positioning seats 18 are inserted into the grooves 19, and the positioning seats 18 and the pressing column 15 are fixed. Only when the positioning seats 18 are inserted into the grooves 19, the pressing column 15 can perform subsequent pressing work. At this time, the hydraulic cylinder 11 continues to drive the pressing plate 13 to descend and perform corresponding pressing work.

[0038] Furthermore, when the pressure column 15 is not aligned with the material trough, the hydraulic cylinder 11 drives the pressing plate 13 to descend, causing the pressure column 15 to directly press on the positioning plate 9. The pressure column 15 will release the restriction of the buckle and move upward into the gap between the mounting seat 12 and the pressing plate 13 without pressing the material trough. After the pressing is completed, the silicon powder in the material trough is processed, effectively ensuring the sintering quality of the material in the subsequent material trough.

[0039] After the pressing is completed, the conveyor belt mechanism 7 near the sintering furnace 28 is started to transport the positioning plate 9 to the inside of the sintering furnace 28 for sintering. After the sintering is completed, the conveyor belt mechanism 7 continues to start and transports the positioning plate 9 to the cooling box 29 for corresponding cooling. A wind box 30 is installed on the top of the cooling box 29. The air outlet of the wind box 30 is connected to the cooling box 29 through a pipeline, and an arched channel 31 is provided in the middle of the cooling box 29, and an air guide plate 14 is provided inside the arched channel 31. When the material needs to be cooled, When cooling, the wind box 30 is started, and the cooling air enters the cooling box 29. The cooling box 29 is divided into two parts by the air guide plate 14. The bottom of the air guide plate 14 is flush with the top surface of the positioning plate 9 after entering. Therefore, a positioning plate 9 can be placed on both sides for separate cooling. The cooling air first cools the positioning plate 9 close to the outlet direction, and the cooling air enters the arched channel 31 to cool the other positioning plate 9, effectively separating the cooling process to prevent the overheated material from directly contacting the cold air and adversely affecting the properties of the material.

[0040] Based on the above structure, when the first positioning plate 9 of the production line enters the cooling box 29, the wind box 30 does not blow out cooling air, but only blows out normal natural air, to perform preliminary cooling on the material inside the positioning plate 9, and waits for the second positioning plate 9 to enter the cooling box 29 before cooling with cooling air, thereby further ensuring the continuity of material cooling and quality assurance.

[0041] After the material is cooled, the conveyor belt mechanism 7 directly moves the positioning plate 9 out of the cooling box 29 , and the staff removes the positioning plate 9 from the conveyor belt mechanism 7 .

[0042] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A production device for a silicon nitride ceramic body, comprising a base (1), characterized in that: A material receiving seat (2), a pressing seat (10), a sintering furnace (28) and a cooling box (29) are fixedly arranged on the top of the base (1) in sequence; conveyor belt mechanisms (7) are respectively arranged on both sides of the pressing seat (10); a preheating cylinder (4) is installed on the top of the material receiving seat (2); a heating plate (6) is movably arranged on the bottom of the preheating cylinder (4) located above the material receiving seat (2); a positioning plate (9) is arranged on the surface of the conveyor belt mechanism (7), and a material trough is opened on the surface of the positioning plate (9); A hydraulic cylinder (11) is installed on the top of the pressing seat (10), and the movable end of the hydraulic cylinder (11) is connected to a pressing plate (13). The interior of the pressing plate (13) is connected with a plurality of pressing columns (15) through a buckle. The interior of the pressing plate (13) is rotatably provided with a plurality of positioning seats (18), and the positioning seats (18) are connected and rotated by a chain transmission mechanism. The outer wall of the pressing column (15) is provided with a groove (19), and the positioning seat (18) and the groove (19) cooperate with each other.

2. The production device of a silicon nitride ceramic body according to claim 1, characterized in that: The interior of the heating plate (6) is rotatably connected to a telescopic rod (23) via a torsion spring shaft (24); one end of the telescopic rod (23) is rotatably connected to a slope block (22), and the other end is rotatably connected to a first plug block (25); the inner wall of the material receiving seat (2) is provided with a positioning groove that matches the slope block (22); the inner wall of the heating plate (6) is located directly opposite to the first plug block (25) and is connected to a second plug block (26) via a return spring (27); and one side of the positioning plate (9) is provided with a positioning block (21) that matches the first plug block (25) and the second plug block (26).

3. The production device of a silicon nitride ceramic body according to claim 1, characterized in that: A stirring mechanism (5) is arranged inside the preheating cylinder (4), and the stirring mechanism (5) comprises a rotating motor and a stirring blade. The rotating motor is installed above the preheating cylinder (4) through a connecting rod, and the output end of the rotating motor is connected to the stirring blade.

4. The production device of a silicon nitride ceramic body according to claim 1, characterized in that: A guide rail is provided on the top of the material receiving seat (2), and the heating plate (6) moves forward and backward along the guide rail, and the top of the heating plate (6) is tightly fitted with the preheating cylinder (4).

5. The production device of a silicon nitride ceramic body according to claim 1, characterized in that: The movable end of the hydraulic cylinder (11) is connected to a mounting seat (12), the pressing plate (13) is arranged below the mounting seat (12) via a connecting column, and a gap is arranged between the mounting seat (12) and the pressing plate (13).

6. The production device of a silicon nitride ceramic body according to claim 1, characterized in that: The chain transmission mechanism comprises an upper chain (17) and a lower chain (20), and the upper chain (17) and the lower chain (20) are respectively meshed with the sprockets at the top and bottom of the positioning seat (18).

7. The production device of a silicon nitride ceramic body according to claim 1, characterized in that: A screw feeder (3) is installed on one side of the material receiving seat (2), the feed port of the screw feeder (3) is connected to the bottom discharge port of the material receiving seat (2), and the discharge port of the screw feeder (3) is directly opposite to the top of the preheating cylinder (4).

8. The production device of a silicon nitride ceramic body according to claim 1, characterized in that: A wind box (30) is installed on the top of the cooling box (29), the air outlet of the wind box (30) is connected to the cooling box (29) through a pipeline, and an arched channel (31) is arranged in the middle of the cooling box (29), and an air guide plate (14) is arranged inside the arched channel (31).

9. The production device of a silicon nitride ceramic body according to claim 1, characterized in that: The conveyor belt mechanism (7) is a metal conveyor belt. A plurality of limit strips (8) are arranged on the surface of the conveyor belt mechanism (7). The bottom of the positioning plate (9) is provided with a limit groove matched with the limit strips (8).

10. The production device of a silicon nitride ceramic body according to claim 6, characterized in that: A driving motor (16) is installed on the top of the pressing plate (13), and the driving motor (16) is connected to the sprocket of the positioning seat (18).

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