A silicon nitride ceramic sintering production device and production method thereof

Abstract

The present application belongs to the technical field of silicon nitride ceramic production, and in particular, relates to a silicon nitride ceramic sintering production device and a production method thereof, comprising a sintering cylinder and a guide rail arranged inside the sintering cylinder, a moving frame is arranged inside the guide rail, two fixed connecting rods arranged in parallel are arranged on the moving frame, the fixed connecting rods are provided with clamps rotating around the fixed connecting rods, the two clamps on the two fixed connecting rods cooperate to clamp the silicon nitride ceramics, the fixed connecting rods are provided with torsion springs, the sintering cylinder comprises an upper straight section, a lower straight section and a central inclined section located between the upper straight section and the lower straight section, the partition of the sintering cylinder can divide the sintering cylinder into different sintering spaces and make each sintering space have a different sintering temperature, and the silicon nitride ceramics are sintered and produced by first installing the silicon nitride ceramics, then exhausting, and then sintering in different areas.

Description

Technical Field

[0001] The present application belongs to the technical field of silicon nitride ceramic production, and in particular relates to a silicon nitride ceramic sintering production device and a production method thereof. Background Art

[0002] The sintering of silicon nitride requires sintering production equipment. Currently, sintering equipment all adopts a tank structure. Silicon nitride ceramics are placed in the tank structure and moved to the sintering production equipment for sintering. However, the problems with this type of sintering production equipment are:

[0003] After sintering, silicon nitride ceramics are not easy to be taken out from the containing tank structure. Generally, silicon nitride ceramics will protrude from a part of the containing tank structure, so that the clip can clamp this part and take out the silicon nitride ceramics, or a layer of isolation layer will be applied inside the containing tank structure to achieve the purpose of taking out silicon nitride, but the containing tank structure is open upward, which will make it difficult to take out silicon nitride ceramics;

[0004] The tank structure is difficult to move in the sintering production equipment, and generally requires the use of powder and other materials to assist the movement of the tank;

[0005] The temperature inside the sintering cylinder has a great influence on other structures of the containing tank structure, and the failure rate of the containing tank structure is relatively high under continuous production operation. Summary of the invention

[0006] In order to solve the above problems, the present application provides a silicon nitride ceramic sintering production device and a production method thereof.

[0007] The first purpose of the present application is to provide a silicon nitride ceramic sintering production device, in which the silicon nitride ceramic is clamped by a clamp, and the clamp is driven by a mobile frame to move on the sintering cylinder, and sintering is performed by dividing the sintering cylinder into different areas.

[0008] In order to achieve the first purpose of this application, the technical solution of this application is:

[0009] A silicon nitride ceramic sintering production device comprises a sintering cylinder and a guide rail arranged inside the sintering cylinder, a moving frame is arranged inside the guide rail, a moving wheel in contact with the guide rail is arranged on the moving frame, two fixed connecting rods arranged in parallel are arranged on the moving frame, a clamping jaw rotating around the fixed connecting rod is arranged on the fixed connecting rod, two clamping jaws on the two fixed connecting rods cooperate to clamp the silicon nitride ceramic, a torsion spring is arranged on the fixed connecting rod, the ends of the torsion spring are connected to the clamping jaws, the sintering cylinder comprises an upper straight section, a lower straight section and a central inclined section located between the upper straight section and the lower straight section, an upper baffle that can be lifted and lowered is arranged on the upper straight section, a lower baffle that can be lifted and lowered is arranged on the lower straight section, two central baffles that can be lifted and lowered are arranged on the central inclined section, and a heating component is arranged in the central inclined section.

[0010] Furthermore, a cross beam is arranged above the sintering cylinder, and the cross beam is fixed to the bottom support through a support column of the cross beam. A driving device is arranged on the cross beam, and a driving shaft is arranged on the output shaft of the driving device. A driven shaft is also arranged on the cross beam, and the driven shaft is driven to rotate by the driving shaft. A sprocket is arranged on the driven shaft, and a chain is arranged on the sprocket. One end of the chain is connected to the upper partition, the lower partition and the center partition, and a counterweight is arranged on the other end of the chain.

[0011] Furthermore, an upper connecting frame is provided on the upper straight section, and an upper partition is inserted in the space of the upper connecting frame; a lower connecting frame is provided on the lower straight section, and a lower partition is inserted in the space of the lower connecting frame; a central connecting frame is provided on the central inclined section, and a central partition is inserted in the space of the central connecting frame; partition grooves are formed at the lower ends of the upper connecting frame, the lower connecting frame and the central connecting frame, and the lower ends of the upper partition, the lower partition and the central partition are inserted in the partition grooves, and the sintering cylinder is divided into multiple independent spaces.

[0012] Furthermore, a connecting ring is provided on the mobile frame, and a connecting part is provided on the connecting ring. Multiple mobile frames are connected together through the connecting part. The steel cable of the winch is connected to the connecting ring close to the upper connecting frame, and the winch drives the mobile frame to move along the guide rail.

[0013] Furthermore, a channel is provided in the guide rail, the movable frame is arranged in the channel of the guide rail, the channel of the guide rail has spaced-apart limit blocks, and the movable wheels are arranged between the limit blocks.

[0014] Furthermore, a limiting groove is provided on the guide rail, the limiting groove is located in the channel of the guide rail, and a heat insulation plate is arranged in the limiting groove. The heat insulation plate is used to isolate the channel in the guide rail from the cylinder space inside the sintering cylinder. The heat insulation plate includes an inner plate and an outer plate arranged on the inner plate. The upper and lower ends of the inner plate are arc-shaped, and the height dimension of the outer plate is smaller than the height dimension of the inner plate.

[0015] Furthermore, an air inlet is provided on the sintering cylinder.

[0016] Furthermore, the clamp is in an "L" shape, and one end of the clamp facing the silicon nitride ceramic is a flat surface.

[0017] The second purpose of the present application is to provide a method for producing silicon nitride ceramics, which is produced by sintering the silicon nitride ceramics by first installing the silicon nitride ceramics, then exhausting the gas, and then sintering in different areas.

[0018] To achieve the second purpose of this application, the technical solution of this application is:

[0019] A method for producing silicon nitride ceramics, using the above-mentioned silicon nitride ceramic sintering production device, comprises the following steps:

[0020] S1. Move the mobile rack into the guide rail of the upper straight section of the sintering cylinder;

[0021] S2, placing the silicon nitride ceramic to be sintered on the clamping jaws, and clamping a piece of silicon nitride ceramic to be sintered by two clamping jaws arranged opposite to each other;

[0022] S3, moving the mobile frame to the central inclined section of the sintering cylinder, driving the upper partition to move by the driving device so that the upper partition closes the upper straight section of the sintering cylinder, and then driving the lower partition to move by the driving device so that the lower partition closes the lower straight section of the sintering cylinder;

[0023] S4, opening the central partitions at different positions of the central inclined section according to the sintering time and the sintering temperature, and moving the movable frame to the corresponding position of the central inclined section;

[0024] S5. After sintering is completed, the driving device drives the lower partition to move so that the lower straight section of the sintering cylinder is opened, the mobile frame is moved to the lower straight section of the sintering cylinder, and the sintered silicon nitride ceramics are removed from the clamping jaws.

[0025] Furthermore, in step S3, when the upper partition closes the upper straight section of the sintering cylinder and the lower partition does not close the lower straight section of the sintering cylinder, oxygen-free protective gas is continuously introduced into the sintering cylinder, and the protective gas flows out from the lower straight section until the sintering cylinder is filled with protective gas, and then the driving device is controlled to drive the lower partition to move so that the lower partition closes the lower straight section of the sintering cylinder.

[0026] Compared with the prior art, the beneficial effects of this application are:

[0027] The sintering cylinder of the present application has a height difference. On the one hand, the moving frame inside the sintering cylinder can move along the sintering cylinder under the action of gravity, avoiding the use of a driver inside the sintering cylinder to drive the moving frame to move. On the other hand, when a protective gas such as nitrogen is filled into the sintering cylinder, the protective gas can flow along the sintering cylinder and discharge the gas in the sintering cylinder from high to low, thereby ensuring the purity of the protective gas in the sintering cylinder.

[0028] The sintering cylinder of the present application has multiple partitions, which can divide the sintering cylinder into different sintering spaces and make each sintering space have a different sintering temperature, providing a suitable temperature space and temperature change for the sintering of silicon nitride ceramics. In addition, the partitions can also block the flow of protective gas to ensure the purity of the protective gas in the sintering cylinder.

[0029] In the present application, a fixed connecting rod is installed on the mobile frame, a clamp is installed on the fixed connecting rod, and the clamp is restricted by a torsion spring, and the silicon nitride ceramic to be sintered is installed on the clamp. Under the action of the torsion spring, the clamp stably clamps the silicon nitride ceramic to be sintered from both ends. During the movement of the mobile frame, the silicon nitride ceramic to be sintered will not fall from the clamp. When the silicon nitride ceramic needs to be placed or removed, it is only necessary to use a tool to open the clamp.

[0030] In the present application, a heat insulation plate is arranged on the guide rail. The heat insulation plate is arranged in a limiting groove of the guide rail and moves with the movable frame. The heat insulation plate and the partition form a sealed sintering space in the sintering cylinder and have a heat insulation effect, which can better sinter silicon nitride ceramics and reduce the impact of high temperature on the movable frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0032] Figure 1 This is a schematic diagram of the overall structure of this application;

[0033] Figure 2 It is a cross-sectional structural schematic diagram of the sintering cylinder of the present application;

[0034] Figure 3 This is a schematic diagram of the overall structure of the mobile frame and the clamping claw of the present application;

[0035] Figure 4 A schematic diagram of the overall structure for use with multiple mobile racks;

[0036] Figure 5 for Figure 4 Schematic diagram of the overall structure that cooperates with the guide rail;

[0037] Figure 6 It is a front view structural schematic diagram of the cooperation between the mobile frame and the guide rail;

[0038] Figure 7 This is a schematic diagram of the overall structure of the heat insulation board of this application.

[0039] In the figure:

[0040] 1. Sintering cylinder, 2. Upper connecting frame, 3. Upper partition, 4. Lower connecting frame, 5. Lower partition, 6. Center connecting frame, 7. Center partition, 8. Air inlet, 9. Bottom support, 10. Support column for beam, 11. Beam, 12. Support column for cylinder, 13. Driving device, 14. Active shaft, 15. Driven shaft, 16. Transmission device, 17. Counterweight, 18. Groove for partition, 19. Guide rail, 20. Moving frame, 21. Moving wheel, 22. Fixed connecting rod, 23. Clamp, 24. Torsion spring, 25. Fixed block, 26. Connecting ring, 27. Connecting part, 28. Heat insulation board, 29. Limit block, 30. Limit groove, 31. Inner plate, 32. Outer plate. DETAILED DESCRIPTION

[0041] The present application is further described below in conjunction with the accompanying drawings and embodiments.

[0042] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0043] In the present application, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present application, and do not specifically refer to any part or element in the present application and should not be understood as limitations on the present application.

[0044] Embodiment: This embodiment is a silicon nitride ceramic sintering production device, which can arrange the silicon nitride ceramics to be sintered in different temperature ranges for calcination, and is convenient for installing and disassembling the silicon nitride ceramics.

[0045] Structurally, the present embodiment includes a sintering cylinder 1 and a guide rail 19 arranged inside the sintering cylinder 1, wherein the structure of the sintering cylinder 1 is one of the core structures of the present embodiment, and the sintering cylinder 1 is the bearing base of other structures. The sintering cylinder 1 includes an upper straight section, a lower straight section, and a central inclined section located between the upper straight section and the lower straight section, that is, the upper and lower ends of the sintering cylinder 1 are both arranged horizontally, which is convenient for feeding and discharging. The middle section of the sintering cylinder 1 is arranged inclined, so that the moving frame 20 in the sintering cylinder 1 can move along the sintering cylinder 1 under the action of gravity, avoiding the use of a driver to drive the moving frame 20 to move in the sintering cylinder 1, and when a protective gas such as nitrogen is filled into the sintering cylinder 1, the protective gas can flow along the sintering cylinder 1 and the inside of the sintering cylinder 1. The gas is discharged from high to low, which ensures the purity of the protective gas in the sintering cylinder 1. This is the main function of the inclined arrangement of the sintering cylinder 1. The lower end of the sintering cylinder 1 is a bottom support 9, which can be the ground or a steel support frame. The sintering cylinder 1 is fixed to the bottom support 9 through the cylinder body with a support column 12. From the cross-section of the sintering cylinder 1, the sintering cylinder 1 is rectangular, and the interior of the sintering cylinder 1 is covered with one or more layers of refractory coating. As a partition component of the sintering cylinder 1, an upper connecting frame 2 is installed on the upper straight section, and an upper partition 3 is inserted in the empty space of the upper connecting frame 2, a lower connecting frame 4 is installed on the lower straight section, and a lower partition 5 is inserted in the empty space of the lower connecting frame 4, a central connecting frame 6 is installed on the central inclined section, and a central partition 7 is inserted in the central connecting frame 6 In the partition, a partition groove 18 is formed at the lower ends of the upper connecting frame 2, the lower connecting frame 4, and the central connecting frame 6. The lower ends of the upper partition 3, the lower partition 5 and the central partition 7 are inserted in the partition groove 18, so that the sintering cylinder 1 is divided into multiple independent spaces, and a heating component is installed in the independent space. The temperature in the independent space can be controlled by controlling the heating component to form an independent space with different temperatures. As a movement scheme of the partition, in this embodiment, the upper partition 3 on the upper straight section, the lower partition 5 on the lower straight section, and the central partition 7 on the central inclined section are all partitions that move in the height direction. Specifically, a crossbeam 11 is installed above the sintering cylinder 1. The crossbeam 11 can be a longitudinal and transverse structure composed of square steel, I-beam, etc. The crossbeam 11 The crossbeam is fixed on the bottom support 9 with a support column 10. In this embodiment, a driving device 13, such as a driving motor, is installed on the crossbeam 11. A driving shaft 14 is installed on the output shaft of the driving device 13. A driven shaft 15 is also installed on the crossbeam 11. The driven shaft 15 is driven to rotate by the driving shaft 14. Specifically, a sprocket is installed on the driven shaft 15, and each shaft has two sprockets. A chain is placed on the sprocket. One end of the chain is connected to the upper partition 3, the lower partition 5 and the center partition 7, and a counterweight 17 is installed on the other end of the chain. As a more specific implementation scheme, in this embodiment, one partition is matched with two parallel driven shafts 15. The driving shaft 14 and the driven shaft 15 are installed with a transmission device 16 that cooperates with each other. For example, a gear is installed on the driving shaft 14.The driven shaft 15 is equipped with a gear which meshes with the gear on the driving shaft 14 to form a transmission device 16. When the driving device 13 drives the driving shaft 14 to rotate, the driving shaft 14 drives the driven shaft 15 to rotate by means of the transmission device 16. With the assistance of the counterweight 17, the partition at the corresponding position is lifted and lowered to complete the opening or closing of the independent space.

[0046] As a bearing and moving structure for silicon nitride ceramics, a moving frame 20 is installed in the guide rail 19 of this embodiment. Since the guide rails 19 are two parallel arranged ones, the moving frames 20 are also two parallel arranged ones. The moving frame 20 is provided with a moving wheel 21 in contact with the guide rail 19, wherein the moving wheel 21 has two and the two moving wheels 21 are close to each other, so that the moving frame 20 can pass through the bending section of the guide rail 19. The moving frame 20 is provided with two parallel arranged fixed connecting rods 22, each of which is provided with a plurality of clamping jaws 23 arranged at intervals and rotating around the fixed connecting rod 22, and the two clamping jaws 23 on the two fixed connecting rods 22 cooperate to clamp the silicon nitride ceramics, and the fixed connecting rod 22 is provided with a torsion spring 24, and the end of the torsion spring 24 is connected to the clamping jaw 23. A fixing block 25 is installed at the end of the torsion spring 24 for fixing the torsion spring 24. The clamp 23 is "L"-shaped, and the end of the clamp 23 facing the silicon nitride ceramic is a plane. The silicon nitride ceramic to be sintered is installed on the clamp 23. Since the clamp 23 is L-shaped and has a plane, the clamp 23 can grasp the silicon nitride ceramic from both ends and the bottom. Compared with the currently used storage tank structure, the contact area between the clamp 23 and the silicon nitride ceramic is smaller. Under the action of the torsion spring 24, the clamp 23 stably clamps the silicon nitride ceramic from both ends and the bottom to be sintered. During the movement of the mobile frame 20, the silicon nitride ceramic to be sintered will not fall off the clamp 23. When the silicon nitride ceramic needs to be placed or removed, it is only necessary to use a tool to open the clamp 23.

[0047] As a necessary structure, in order to increase the number of silicon nitride ceramics sintered at one time, a connecting ring 26 is installed on the movable frame 20 in this embodiment, and a connecting part 27 is installed on the connecting ring 26. A plurality of movable frames 20 are connected together by the connecting part 27 to form a whole. As a power device of the movable frame 20, when the movable frame 20 moves downward along the guide rail 19, it is necessary to rely on the gravity of the movable frame 20 to realize the movement of the movable frame 20. When the movable frame 20 moves upward along the guide rail 19, it is necessary to rely on a winch. The steel cable of the winch is connected to the connecting ring 26 close to the upper connecting frame 2. The winch is used to drive the movable frame 20 to move upward along the guide rail 19. When the guide rail 19 moves downward, the winch pulls the movable frame 20 to control the moving speed of the movable frame 20.

[0048] As the guide rail 19 structure, the guide rail 19 of this embodiment has a channel, the moving frame 20 is arranged in the channel of the guide rail 19, the channel of the guide rail 19 has spaced limit blocks 29, the moving wheel 21 is arranged between the limit blocks 29, the movement of the moving wheel 21 is limited, and the moving wheel 21 is prevented from deflecting during the movement. As the heat insulation structure, the guide rail 19 of this embodiment is provided with a limit groove 30, the limit groove 30 is located in the channel of the guide rail 19, the heat insulation board 28 is arranged in the limit groove 30, and the heat insulation board 28 is used to insulate The channel in the insulating guide rail 19 and the inner space of the sintering cylinder 1 are isolated, and the insulating plate 28 is designed to include an inner plate 31 and an outer plate 32 arranged on the inner plate 31. The upper and lower ends of the inner plate 31 are arc-shaped, and the height of the outer plate 32 is smaller than the height of the inner plate 31, so that the contact surface between the insulating plate 28 and the limiting groove 30 is small, which is convenient for the insulating plate 28 to follow the movement of the moving frame 20, and the length of the insulating plate 28 is small, which is convenient for the insulating plate 28 to move and to pass through the bending section of the guide rail 19.

[0049] In this embodiment, the air in the sintering cylinder 1 needs to be discharged before sintering to prevent the oxygen in the air from affecting the silicon nitride ceramic. In this embodiment, an air inlet 8 is installed on the sintering cylinder 1, wherein the air inlet 8 is arranged at the upper part of the central inclined section of the sintering cylinder 1, and is close to the upper connecting frame 2 and the upper partition 3. After the upper partition 3 closes the upper straight section, a protective gas, such as nitrogen, is introduced through the air inlet 8 to discharge the air in the sintering cylinder 1.

[0050] Based on a silicon nitride ceramic sintering production device, this embodiment discloses a method for producing silicon nitride ceramics, comprising the following steps:

[0051] S1, move the mobile frame 20 to the guide rail 19 of the upper straight section of the sintering cylinder 1;

[0052] S2, placing the silicon nitride ceramic to be sintered on the clamping jaws 23, and clamping a piece of silicon nitride ceramic to be sintered by two clamping jaws 23 arranged opposite to each other;

[0053] S3, move the mobile frame 20 to the central inclined section of the sintering cylinder 1, and drive the upper partition 3 by the driving device 13 so that the upper partition 3 closes the upper straight section of the sintering cylinder 1, and then drive the lower partition 5 by the driving device 13 so that the lower partition 5 closes the lower straight section of the sintering cylinder 1;

[0054] S4, opening the central partition 7 at different positions of the central inclined section according to the sintering time and the sintering temperature, and moving the movable frame 20 to the corresponding position of the central inclined section;

[0055] S5. After sintering is completed, the driving device 13 drives the lower partition 5 to move so that the lower straight section of the sintering cylinder 1 is opened, the moving frame 20 is moved to the lower straight section of the sintering cylinder 1, and the sintered silicon nitride ceramic is removed from the clamping jaws 23.

[0056] Specifically, in step S1, the winch controls the movable frame 20 to move in the guide rail 19, and the upward or downward movement of the movable frame 20 is determined according to the rotation direction of the roller of the winch, and the position of the movable frame 20 on the guide rail 19 is determined according to the release length of the steel cable on the roller. The control principle of the movable frame 20 in other steps is the same as above.

[0057] In step S2, the clamping jaws 23 are opened with a tool such as an iron hook, and the silicon nitride ceramic to be sintered is placed on the clamping jaws 23 with an iron clamp and the iron hook is released. It is recommended that two people cooperate in this process.

[0058] In step S3, when the upper partition 3 closes the upper straight section of the sintering cylinder 1 and the lower partition 5 does not close the lower straight section of the sintering cylinder 1, a protective gas without oxygen is continuously introduced into the sintering cylinder 1, and the protective gas flows out from the lower straight section until the sintering cylinder 1 is filled with the protective gas. Then the driving device 13 is controlled to drive the lower partition 5 to move so that the lower partition 5 closes the lower straight section of the sintering cylinder 1. For example, the protective gas is nitrogen.

[0059] In step S4 , the opening and closing of the central partition 7 is controlled by the driving device 13 .

[0060] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0061] Although the above describes the specific implementation methods of the present application in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present application. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present application, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present application.

Claims

1. A silicon nitride ceramic sintering production device, characterized in that: The invention comprises a sintering cylinder (1) and a guide rail (19) arranged inside the sintering cylinder (1); a moving frame (20) is arranged inside the guide rail (19); a moving wheel (21) in contact with the guide rail (19) is arranged on the moving frame (20); two fixed connecting rods (22) arranged in parallel are arranged on the moving frame (20); a clamping jaw (23) rotating around the fixed connecting rod (22) is arranged on the fixed connecting rod (22); the two clamping jaws (23) on the two fixed connecting rods (22) cooperate to clamp silicon nitride ceramics; a torsion spring (24) is arranged on the fixed connecting rod (22); the end of the torsion spring (24) is connected to the clamping jaw (23); The sintering cylinder (1) comprises an upper straight section, a lower straight section and a central inclined section located between the upper straight section and the lower straight section, the upper straight section is provided with an upper baffle (3) that can be raised and lowered, the lower straight section is provided with a lower baffle (5) that can be raised and lowered, the central inclined section is provided with two central baffles (7) that can be raised and lowered, and a heating component is provided in the central inclined section; The guide rail (19) is provided with a limiting groove (30), the limiting groove (30) is located in the channel of the guide rail (19), a heat insulation plate (28) is arranged in the limiting groove (30), the heat insulation plate (28) is used to isolate the channel in the guide rail (19) from the cylinder space inside the sintering cylinder (1), and the heat insulation plate (28) moves with the moving frame (20); The heat insulation board (28) comprises an inner plate (31) and an outer plate (32) arranged on the inner plate (31); the upper end and the lower end of the inner plate (31) are arc-shaped; and the height dimension of the outer plate (32) is smaller than the height dimension of the inner plate (31).

2. A silicon nitride ceramic sintering production device as claimed in claim 1, characterized in that: A crossbeam (11) is arranged above the sintering cylinder (1), and the crossbeam (11) is fixed to the bottom support (9) through a crossbeam support column (10). A driving device (13) is arranged on the crossbeam (11), and a driving shaft (14) is arranged on the output shaft of the driving device (13). A driven shaft (15) is also arranged on the crossbeam (11), and the driven shaft (15) is driven to rotate by the driving shaft (14). A sprocket is arranged on the driven shaft (15), and a chain is arranged on the sprocket. One end of the chain is connected to the upper partition (3), the lower partition (5) and the center partition (7), and the other end of the chain is provided with a counterweight (17).

3. A silicon nitride ceramic sintering production device as claimed in claim 1, characterized in that: An upper connecting frame (2) is provided on the upper straight section, and an upper partition (3) is inserted into the space of the upper connecting frame (2); a lower connecting frame (4) is provided on the lower straight section, and a lower partition (5) is inserted into the space of the lower connecting frame (4); a central connecting frame (6) is provided on the central inclined section, and a central partition (7) is inserted into the space of the central connecting frame (6); A partition groove (18) is formed at the lower ends of the upper connecting frame (2), the lower connecting frame (4) and the central connecting frame (6); the lower ends of the upper partition (3), the lower partition (5) and the central partition (7) are inserted into the partition groove (18), and the sintering cylinder (1) is divided into a plurality of independent spaces.

4. A silicon nitride ceramic sintering production device as claimed in claim 1, characterized in that: The movable frame (20) is provided with a connecting ring (26), and the connecting ring (26) is provided with a connecting portion (27). A plurality of movable frames (20) are connected together via the connecting portion (27). The steel cable of the hoist is connected to the connecting ring (26) close to the upper connecting frame (2). The hoist drives the movable frame (20) to move along the guide rail (19).

5. A silicon nitride ceramic sintering production device as claimed in claim 1, characterized in that: The guide rail (19) has a channel therein, the moving frame (20) is arranged in the channel of the guide rail (19), the channel of the guide rail (19) has spaced-apart limit blocks (29), and the moving wheels (21) are arranged between the limit blocks (29).

6. A silicon nitride ceramic sintering production device as claimed in claim 1, characterized in that: The sintering cylinder (1) is provided with an air inlet (8).

7. A silicon nitride ceramic sintering production device as claimed in claim 1, characterized in that: The clamping jaw (23) is in an "L" shape, and one end of the clamping jaw (23) facing the silicon nitride ceramic is a flat surface.

8. A method for producing silicon nitride ceramics, characterized in that: A silicon nitride ceramic sintering production device according to any one of claims 1 to 7 is used, comprising the following steps: S1, moving the movable frame (20) into the guide rail (19) of the upper straight section of the sintering cylinder (1); S2, placing the silicon nitride ceramic to be sintered on the clamping jaws (23), and clamping a piece of silicon nitride ceramic to be sintered by two clamping jaws (23) arranged opposite to each other; S3, moving the movable frame (20) to the central inclined section of the sintering cylinder (1), and driving the upper partition (3) by the driving device (13) to move so that the upper partition (3) closes the upper straight section of the sintering cylinder (1), and then driving the lower partition (5) by the driving device (13) to move so that the lower partition (5) closes the lower straight section of the sintering cylinder (1); S4, opening the central partition (7) at different positions of the central inclined section according to the sintering time and the sintering temperature, and moving the movable frame (20) to the corresponding position of the central inclined section; S5. After sintering is completed, the driving device (13) drives the lower partition (5) to move so that the lower straight section of the sintering cylinder (1) is opened, the moving frame (20) is moved to the lower straight section of the sintering cylinder (1), and the sintered silicon nitride ceramic is removed from the clamping jaws (23).

9. A method for producing silicon nitride ceramics according to claim 8, characterized in that: In step S3, when the upper baffle (3) closes the upper straight section of the sintering cylinder (1) and the lower baffle (5) does not close the lower straight section of the sintering cylinder (1), a protective gas containing no oxygen is continuously introduced into the sintering cylinder (1), and the protective gas flows out from the lower straight section until the sintering cylinder (1) is filled with the protective gas. Then, the driving device (13) is controlled to drive the lower baffle (5) to move so that the lower baffle (5) closes the lower straight section of the sintering cylinder (1).

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