Preforming equipment and forming method for manufacturing silicon nitride ceramic green body

Abstract

The invention discloses a preforming method for manufacturing a silicon nitride ceramic green body, which is applied to preforming equipment for manufacturing the silicon nitride ceramic green body, the preforming equipment comprises a base bracket, and the top of the base bracket is fixedly connected with a bracket I. The two forming mold assemblies can be switched by rotating the driving assembly, double-station switching is achieved, the briquetting forming efficiency is improved, a preformed silicon nitride ceramic blank can be ejected out of the top of the forming mold, a second air cylinder extends to push the formed silicon nitride ceramic blank away from the top of a rotating plate through a push plate, and the forming efficiency is improved. The silicon nitride ceramic blank is guided and discharged through the slope plate, briquetting forming can be achieved by adopting a double-station switching method without feeding in the preforming equipment and taking out the preformed silicon nitride ceramic blank, feeding does not need to be close to the briquetting forming equipment, the formed silicon nitride ceramic blank is automatically pushed out of the briquetting platform, the safety is high, and the efficiency is high. And the forming efficiency of the silicon nitride ceramic blank is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of silicon nitride ceramic blank manufacturing, and particularly relates to a preforming device and a forming method for silicon nitride ceramic blank manufacturing. Background Art

[0002] Silicon nitride ceramics are an inorganic material ceramic 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 and has properties such as high strength, low density, and high temperature resistance.

[0003] Briquetting is a method for manufacturing silicon nitride ceramic blanks. Generally, silicon nitride ceramic raw materials are added to a stamping die, silicon nitride powder is pressed into blocks, and then sintered into silicon nitride ceramics. In the actual operation process, the efficiency of single-station stamping for manufacturing silicon nitride ceramic blanks is low. The silicon nitride ceramic blanks after stamping need to be manually removed from the stamping table, and the degree of automation is low. Moreover, both the feeding and the removal of the formed silicon nitride ceramic blanks need to be operated on the stamping equipment, which is prone to safety hazards. Therefore, we proposed a preforming equipment and forming method for silicon nitride ceramic blank manufacturing, which adopts a double-station switching method for briquetting. The feeding does not need to be close to the briquetting forming equipment. The formed silicon nitride ceramic blank is automatically pushed out of the briquetting platform, which has high safety and improves the forming efficiency of silicon nitride ceramic blanks. Summary of the invention

[0004] The purpose of the present invention is to provide a preforming device and a forming method for manufacturing silicon nitride ceramic blanks, which adopts a double-station switching method to perform briquetting and forming. The material does not need to be close to the briquetting forming equipment for feeding. The formed silicon nitride ceramic blank is automatically pushed out of the briquetting platform, which has high safety and improves the forming efficiency of the silicon nitride ceramic blank to solve the above-mentioned background technical problems.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: a preforming method for manufacturing a silicon nitride ceramic blank is applied to a preforming device for manufacturing a silicon nitride ceramic blank, the preforming device comprises a base bracket, the top of the base bracket is fixedly connected to a bracket one, the top of the bracket one is fixedly connected to a bearing plate, the top of the bearing plate is fixedly installed with a bracket two, the front side of the bracket two is fixedly connected to a fixing plate, the inner cavity of the fixing plate is slidably connected to a movable cylinder, the bottom of the inner cavity of the movable cylinder is rotatably connected to an axle rod, the top of the axle rod extends to the top of the movable cylinder and is fixedly connected to a rotating plate, a rotating drive assembly is arranged between the movable cylinder and the axle rod, the front and rear sides of the top of the rotating plate are both embedded and fixedly installed with a forming mold assembly, the forming mold assembly The invention relates to a molding die which is fixedly connected to a rotating plate, wherein an inner cavity of the molding die is slidably connected to a molding bottom plate which is tightly fitted to an inner wall of the molding die, a vertical frame is fixedly connected to the top of the base bracket and the carrying plate, a hydraulic cylinder is fixedly installed on the vertical frame, an upper pressure head which is adapted to the molding die assembly is fixedly installed on the output end of the hydraulic cylinder, a cylinder 1 is embeddedly fixedly installed on the top of the carrying plate, an ejection plate is fixedly installed on the output end of the cylinder 1, and the ejection plate is adapted to the molding die assembly, a side fixing plate is fixedly installed on the right side of the top of the bracket 2, a ramp plate is fixedly connected to the left side of the top of the bracket 2, a cylinder 2 is fixedly installed on the top of the side fixing plate, a push plate is fixedly installed on the output end of the cylinder 2, and a lifting assembly is arranged between the movable cylinder and the base bracket;

[0006] A preforming method for manufacturing a silicon nitride ceramic body, the preforming method steps are as follows:

[0007] Step 1: Add silicon nitride ceramic raw materials into the inner cavity of the outer forming mold, then the motor drives the cam plate to rotate 90 degrees clockwise, the shaft pin on the cam plate causes the oblique push arm to rotate, the bottom oblique push arm is fixed to the bottom plate, so that the cam plate, the motor and the lifting plate slide on the surface of the slide rail and move upward, the top oblique push arm pushes the movable cylinder to move upward in the inner cavity of the fixed plate, and the movable cylinder drives the shaft rod, the rotating drive assembly, the rotating plate and the forming mold assembly to move upward until the forming mold assembly moves to the top of the push plate;

[0008] Step 2: Then the motor 1 drives the gear 2 to rotate, and the gear 3 drives the threaded rod to rotate. The threaded sleeve moves under the guidance of the thread and the guide rod, and then drives the rack to move. The rack drives the gear 1 and the shaft rod to rotate 180 degrees, and the shaft rod drives the rotating plate to rotate 180 degrees. At this time, the forming mold assembly containing the silicon nitride ceramic raw material enters the inside and is located directly below the upper pressure head, and the forming mold assembly without the silicon nitride ceramic raw material is located on the outside;

[0009] Step 3: At this time, the motor drives the cam plate to rotate 90 degrees counterclockwise. Through the cooperation of the shaft pin and the inclined push arm, the lifting plate drives the sliding sleeve to slide downward on the surface of the slide rail, thereby causing the movable cylinder, the shaft rod, the rotating drive assembly, the rotating plate and the forming mold assembly to move downward, so that the rotating plate falls above the bracket 2 and is located between the side fixed plate and the ramp plate. At this time, the hydraulic cylinder drives the upper pressure head to enter the inner cavity of the forming mold to press the silicon nitride ceramic raw material into blocks, and then the hydraulic cylinder drives the upper pressure head to move up and reset;

[0010] Step 4: At this time, cylinder 1 drives the ejector plate to move upward, and the ejector plate extends into the inner cavity of the molding mold, pushing the mold bottom plate upward to eject the formed silicon nitride ceramic raw material out of the inner cavity of the molding mold. At this time, the mold bottom plate drives the movable rod and the connecting plate to move upward and squeeze the spring. Then cylinder 2 drives the push plate to move, and the formed silicon nitride ceramic raw material is pushed onto the ramp plate, and discharged through the guidance of the ramp plate. Cylinder 1 drives the ejector plate to retract. At this time, the restoring force of the spring causes the connecting plate and the movable rod to move downward, and the movable rod drives the mold bottom plate to move downward to the bottom of the inner cavity of the molding mold for reset. At this time, a certain amount of silicon nitride ceramic raw material is loaded into the inner cavity of the outer molding mold. According to the above operation, the briquetting operation is continued.

[0011] Preferably, the rotation drive assembly includes a gear 1 fixedly connected to the surface of the shaft rod, the inner cavity of the movable cylinder is rotatably connected to a threaded rod, the surface of the threaded rod is threadedly connected to a threaded sleeve, one side of the threaded sleeve is fixedly connected to a rack, and the rack is meshed with gear 1.

[0012] Preferably, a motor 1 is fixedly installed in the inner cavity of the movable cylinder, a gear 2 is fixedly installed on the output shaft of the motor 1, and a gear 3 meshing with the gear 2 is fixedly connected to the surface of the threaded rod.

[0013] Preferably, the inner cavity of the movable cylinder is fixedly connected to a guide rod, and the threaded sleeve is slidably connected to the surface of the guide rod.

[0014] Preferably, the lifting assembly includes a base plate fixedly connected to the front side of the top of the base bracket, both sides of the top of the base plate are fixedly connected with sliding rails, the top of the sliding rails is fixedly connected to the fixed plate, the surface of the sliding rails is slidably connected with sliding sleeves, and the front sides of the two sliding sleeves are fixedly connected with lifting plates.

[0015] Preferably, a motor is fixedly installed on the front side of the lifting plate, a cam plate is fixedly installed on the output shaft of the motor, both ends of the front side of the cam plate are fixedly connected with axle pins, the surface of the axle pin is rotatably connected with an oblique push arm, the top of the oblique push arm located at the top is rotatably connected to the movable cylinder through a rotating shaft, and the bottom of the oblique push arm located at the bottom is rotatably connected to the bottom plate through a rotating shaft.

[0016] Preferably, two symmetrical limiting bars are fixedly connected to the surface of the movable cylinder, and limiting grooves for the limiting bars to slide are provided on both sides of the inner cavity of the fixed plate.

[0017] Preferably, the bottom of the rotating plate is fixedly connected to a limiting rotating ring, and the limiting rotating ring is rotatably connected to the top of the surface of the movable cylinder.

[0018] Preferably, the four corners of the bottom of the mold base plate are fixedly connected with movable rods, and the bottom of the movable rods penetrates the bottom of the molding mold and is slidably connected to the molding mold.

[0019] Preferably, a connecting plate is fixedly connected to the bottom of the movable rod, and a spring is welded between the connecting plate and the forming mold.

[0020] The beneficial effects of the present invention are:

[0021] 1. The present invention can switch two molding die assemblies through a rotating drive assembly, and the double-station switching can improve the efficiency of block molding. The preformed silicon nitride ceramic embryo will be ejected from the top of the molding die. The second extension of the cylinder will push the formed silicon nitride ceramic embryo away from the top of the rotating plate through the push plate, and be discharged through the guide of the ramp plate. There is no need to add materials and take out the preformed silicon nitride ceramic embryo inside the preforming equipment, and the double-station switching method can be used for block molding. There is no need to approach the block molding equipment for adding materials. The formed silicon nitride ceramic embryo is automatically pushed out of the block platform, which has high safety and improves the purpose of silicon nitride ceramic embryo molding efficiency.

[0022] 2. The present invention uses the limiting strip and the limiting groove in coordination, so that the limiting strip can slide in the inner cavity of the limiting groove during the lifting and lowering of the movable cylinder, thereby guiding and supporting the lifting and lowering of the movable cylinder, avoiding the side deviation of the movable cylinder, and ensuring the stability and reliability of the lifting and lowering of the movable cylinder;

[0023] 3. The present invention provides a limiting swivel ring, and when the shaft drives the rotating plate to rotate, the limiting swivel ring will rotate on the surface of the movable cylinder, thereby limiting and supporting the rotation of the rotating plate, thereby improving the stability of the rotation of the rotating plate;

[0024] 4. The present invention provides a guide rod so that the threaded sleeve can slide on the surface of the guide rod to guide the movement of the threaded sleeve, thereby preventing the threaded sleeve from rotating with the threaded rod and improving the stability of the movement of the threaded sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or other advantages of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings, which are only exemplary and do not limit the present invention, wherein:

[0026] Figure 1 A three-dimensional schematic diagram of an embodiment of the present invention;

[0027] Figure 2 A bottom-up perspective schematic diagram of an embodiment of the present invention;

[0028] Figure 3 A three-dimensional schematic diagram of a partial structure of an embodiment of the present invention;

[0029] Figure 4 It is a three-dimensional schematic diagram of a rotating plate and a lifting assembly according to an embodiment of the present invention;

[0030] Figure 5 It is a three-dimensional disassembled schematic diagram of a fixed plate, a movable cylinder and a rotating plate according to an embodiment of the present invention;

[0031] Figure 6 A schematic top view of a cross-sectional view of a movable cylinder according to an embodiment of the present invention;

[0032] Figure 7 It is a three-dimensional schematic diagram of the disassembled molding die assembly according to an embodiment of the present invention.

[0033] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0034] 1. Base bracket, 2. Bracket 1, 3. Loading plate, 4. Bracket 2, 5. Fixed plate, 6. Movable cylinder, 7. Shaft, 8. Rotation drive assembly, 81. Gear 1, 82. Threaded rod, 83. Threaded sleeve, 84. Rack, 85. Motor 1, 86. Gear 2, 87. Gear 3, 88. Guide rod, 9. Rotating plate, 10. Forming mold assembly, 101. Forming mold, 102. Mold bottom plate, 103. Movable rod, 104. Connecting plate, 1 05. Spring, 11. Stand, 12. Hydraulic cylinder, 13. Upper pressure head, 14. Cylinder one, 15. Ejector plate, 16. Side fixing plate, 17. Ramp plate, 18. Cylinder two, 19. Push plate, 20. Lifting assembly, 201. Bottom plate, 202. Slide rail, 203. Sliding sleeve, 204. Lifting plate, 205. Motor, 206. Cam plate, 207. Axle pin, 208. Push arm, 21. Limit strip, 22. Limit groove, 23. Limit swivel. DETAILED DESCRIPTION

[0035] Hereinafter, embodiments of a preforming apparatus and a forming method for manufacturing a silicon nitride ceramic green body according to the present invention will be described with reference to the accompanying drawings.

[0036] The embodiments described herein are specific embodiments of the present invention, which are used to illustrate the concept of the present invention, are illustrative and exemplary, and should not be interpreted as limiting the embodiments of the present invention and the scope of the present invention. In addition to the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the claims and the contents disclosed in the specification of this application, including technical solutions that adopt any obvious replacement and modification of the embodiments described herein.

[0037] The drawings of this specification are schematic diagrams, which assist in explaining the concept of the present invention and schematically show the shapes of various parts and their mutual relationships. Please note that in order to clearly show the structures of various components of the embodiments of the present invention, the drawings are not drawn according to the same scale. The same reference numerals are used to represent the same parts.

[0038] Embodiment 1

[0039] Figure 1-7A preforming method for manufacturing a silicon nitride ceramic blank according to an embodiment of the present invention is shown, which is applied to a preforming device for manufacturing a silicon nitride ceramic blank, the preforming device includes a base bracket 1, the top of the base bracket 1 is fixedly connected to a bracket 2, the top of the bracket 2 is fixedly connected to a bearing plate 3, the top of the bearing plate 3 is fixedly installed with a bracket 2 4, the front side of the bracket 2 4 is fixedly connected to a fixing plate 5, the inner cavity of the fixing plate 5 is slidably connected to a movable cylinder 6, the surface of the movable cylinder 6 is fixedly connected to two symmetrical limit bars 21, both sides of the inner cavity of the fixing plate 5 are provided with limit grooves 22 for the limit bars 21 to slide, through the cooperation of the limit bars 21 and the limit grooves 22, during the lifting and lowering of the movable cylinder 6 The limiting strip 21 will slide in the inner cavity of the limiting groove 22, which can guide and support the lifting and lowering of the movable cylinder 6, avoiding the lateral deviation of the movable cylinder 6, and ensuring the stability and reliability of the lifting and lowering of the movable cylinder 6. The bottom of the inner cavity of the movable cylinder 6 is rotatably connected with an axle rod 7, and the top of the axle rod 7 extends to the top of the movable cylinder 6 and is fixedly connected with a rotating plate 9. The bottom of the rotating plate 9 is fixedly connected with a limiting swivel 23, and the limiting swivel 23 is rotatably connected to the top of the surface of the movable cylinder 6. Through the setting of the limiting swivel 23, the limiting swivel 23 will rotate on the surface of the movable cylinder 6 during the rotation of the rotating plate 9 driven by the axle rod 7, thereby limiting and supporting the rotation of the rotating plate 9, and improving the stability of the rotation of the rotating plate 9. Qualitatively, a rotating drive assembly 8 is arranged between the movable cylinder 6 and the shaft rod 7, and a forming mold assembly 10 is embedded and fixedly installed on the front and rear sides of the top of the rotating plate 9. The forming mold assembly 10 includes a forming mold 101 fixedly connected to the rotating plate 9, and the inner cavity of the forming mold 101 is slidably connected to a mold bottom plate 102 that fits tightly with the inner wall of the forming mold 101. The four corners of the bottom of the mold bottom plate 102 are fixedly connected to movable rods 103, and the bottom of the movable rod 103 penetrates to the bottom of the forming mold 101 and is slidably connected to the forming mold 101. The bottom of the movable rod 103 is fixedly connected to a connecting plate 104, and a spring 105 is welded between the connecting plate 104 and the forming mold 101. The base supports The frame 1 is fixedly connected to the top of the carrier plate 3 with a vertical frame 11, a hydraulic cylinder 12 is fixedly installed on the vertical frame 11, an upper pressure head 13 adapted to the molding die assembly 10 is fixedly installed on the output end of the hydraulic cylinder 12, a cylinder 14 is embedded and fixedly installed on the top of the carrier plate 3, an ejector plate 15 is fixedly installed on the output end of the cylinder 14, and the ejector plate 15 is adapted to the molding die assembly 10, a side fixing plate 16 is fixedly installed on the right side of the top of the bracket 2 4, a ramp plate 17 is fixedly connected to the left side of the top of the bracket 2 4, a cylinder 2 18 is fixedly installed on the top of the side fixing plate 16, a push plate 19 is fixedly installed on the output end of the cylinder 2 18, and a jacking assembly 20 is arranged between the movable cylinder 6 and the base bracket 1;

[0040] A preforming method for manufacturing a silicon nitride ceramic body, the preforming method steps are as follows:

[0041] Step 1: Add silicon nitride ceramic raw material into the inner cavity of the outer molding die 101, then the motor 205 drives the cam plate 206 to rotate ninety degrees clockwise, and the shaft pin 207 on the cam plate 206 causes the oblique push arm 208 to rotate, and the bottom oblique push arm 208 is fixed to the bottom plate 201, so that the cam plate 206, the motor 205 and the lifting plate 204 slide on the surface of the slide rail 202 due to the sliding sleeve 203 to move upward, and the top oblique push arm 208 pushes the movable cylinder 6 to move upward in the inner cavity of the fixed plate 5, and the movable cylinder 6 drives the shaft 7, the rotation drive assembly 8, the rotating plate 9 and the molding die assembly 10 to move upward until the molding die assembly 10 moves to the top of the push plate 19;

[0042] Step 2: Then the motor 1 85 drives the gear 2 86 to rotate, and drives the threaded rod 82 to rotate through the gear 3 87. The threaded sleeve 83 moves under the guidance of the thread and the guide rod 88, and then drives the rack 84 to move. The rack 84 drives the gear 1 81 and the shaft 7 to rotate 180 degrees, and the shaft 7 drives the rotating plate 9 to rotate 180 degrees. At this time, the forming mold assembly 10 containing the silicon nitride ceramic raw material enters the inner side and is located directly below the upper pressure head 13, and the forming mold assembly 10 without the silicon nitride ceramic raw material is located on the outside;

[0043] Step 3: At this time, the motor 205 drives the cam plate 206 to rotate counterclockwise by 90 degrees. Through the cooperation of the shaft pin 207 and the inclined push arm 208, the lifting plate 204 drives the sliding sleeve 203 to slide downward on the surface of the slide rail 202, thereby causing the movable cylinder 6, the shaft rod 7, the rotating drive assembly 8, the rotating plate 9 and the forming mold assembly 10 to move downward, so that the rotating plate 9 falls above the bracket 2 4 and is located between the side fixing plate 16 and the ramp plate 17. At this time, the hydraulic cylinder 12 drives the upper pressure head 13 to enter the inner cavity of the forming mold 101 to press the silicon nitride ceramic raw material into blocks, and then the hydraulic cylinder 12 drives the upper pressure head 13 to move upward and reset;

[0044] Step 4: At this time, the cylinder 14 drives the ejector plate 15 to move upward, and the ejector plate 15 extends into the inner cavity of the forming mold 101, which pushes the mold bottom plate 102 to move upward to eject the formed silicon nitride ceramic raw material out of the inner cavity of the forming mold 101. At this time, the mold bottom plate 102 drives the movable rod 103 and the connecting plate 104 to move upward and squeeze the spring 105. Then the cylinder 2 18 drives the push plate 19 to move, and the formed silicon nitride ceramic raw material is pushed onto the ramp plate 17, and discharged through the guide of the ramp plate 17. The cylinder 14 drives the ejector plate 15 to retract. At this time, the restoring force of the spring 105 causes the connecting plate 104 and the movable rod 103 to move downward, and the movable rod 103 drives the mold bottom plate 102 to move downward to the bottom of the inner cavity of the forming mold 101 for reset. At this time, a certain amount of silicon nitride ceramic raw material is loaded into the inner cavity of the outer forming mold 101. According to the above operation, the briquetting operation is continued.

[0045] Embodiment 2

[0046] It is basically the same as the first embodiment, and further: the rotation driving assembly 8 includes a gear 1 81 fixedly connected to the surface of the shaft rod 7, the inner cavity of the movable cylinder 6 is rotatably connected to a threaded rod 82, the surface of the threaded rod 82 is threadedly connected to a threaded sleeve 83, one side of the threaded sleeve 83 is fixedly connected to a rack 84, the rack 84 is meshed with the gear 1 81, the inner cavity of the movable cylinder 6 is fixedly installed with a motor 1 85, the output shaft of the motor 1 85 is fixedly installed with a gear 2 86, the surface of the threaded rod 82 is fixedly connected with a gear 3 87 meshed with the gear 2 86, the inner cavity of the movable cylinder 6 is fixedly connected with a guide rod 88, and the threaded sleeve 83 is slidably connected to the surface of the guide rod 88. Through the setting of the guide rod 88, the threaded sleeve 83 will slide on the surface of the guide rod 88, and guide the movement of the threaded sleeve 83, thereby avoiding the threaded sleeve 83 from rotating following the rotation of the threaded rod 82, and improving the stability of the movement of the threaded sleeve 83.

[0047] Embodiment 3

[0048] Basically the same as the first embodiment, further: the lifting assembly 20 includes a bottom plate 201 fixedly connected to the front side of the top of the base bracket 1, both sides of the top of the bottom plate 201 are fixedly connected with slide rails 202, the top of the slide rails 202 is fixedly connected to the fixed plate 5, the surface of the slide rails 202 is slidably connected with sliding sleeves 203, the front sides of the two sliding sleeves 203 are fixedly connected with lifting plates 204, the front side of the lifting plates 204 is fixedly installed with a motor 205, the output shaft of the motor 205 is fixedly installed with a cam plate 206, both ends of the front side of the cam plate 206 are fixedly connected with shaft pins 207, the surface of the shaft pin 207 is rotatably connected with an oblique push arm 208, the top of the oblique push arm 208 at the top is rotatably connected to the movable cylinder 6 through a rotating shaft, and the bottom of the oblique push arm 208 at the bottom is rotatably connected to the bottom plate 201 through a rotating shaft.

[0049] To sum up: the preforming equipment and forming method for manufacturing silicon nitride ceramic blanks can switch the two forming mold assemblies 10 through the rotating drive component 8, and the double-station switching can improve the efficiency of block forming. The preformed silicon nitride ceramic blank will be ejected from the top of the forming mold 101, and the extension of cylinder 2 18 will push the formed silicon nitride ceramic blank away from the top of the rotating plate 9 through the push plate 19, and be discharged through the guide plate 17. There is no need to add materials and take out the preformed silicon nitride ceramic blank inside the preforming equipment, and the block forming can be achieved by using the double-station switching method. There is no need to approach the block forming equipment for adding materials, and the formed silicon nitride ceramic blank is automatically pushed out of the block platform, which has high safety and improves the purpose of silicon nitride ceramic blank forming efficiency.

[0050] The technical features disclosed above are not limited to the disclosed combinations with other features. Those skilled in the art may also make other combinations between the technical features according to the purpose of the invention to achieve the purpose of the invention.

Claims

1. A preforming method for manufacturing a silicon nitride ceramic body, applied to a preforming device for manufacturing a silicon nitride ceramic body, characterized in that: The preforming device comprises a base support (1), the top of the base support (1) is fixedly connected to a support 1 (2), the top of the support 1 (2) is fixedly connected to a bearing plate (3), the top of the bearing plate (3) is fixedly installed with a support 2 (4), the front side of the support 2 (4) is fixedly connected to a fixing plate (5), the inner cavity of the fixing plate (5) is slidably connected to a movable cylinder (6), the bottom of the inner cavity of the movable cylinder (6) is rotatably connected to an axle rod (7), the top of the axle rod (7) extends to the top of the movable cylinder (6) and is fixedly connected to a rotating plate (9), a rotating drive assembly (8) is provided between the movable cylinder (6) and the axle rod (7), the front side and the rear side of the top of the rotating plate (9) are both embedded and fixedly installed with a molding die assembly (10), the molding die assembly (10) comprises a molding die (101) fixedly connected to the rotating plate (9), the inner cavity of the molding die (101) is slidably connected to a The inner wall of the mold bottom plate (102) is tightly fitted, the base support (1) is fixedly connected to the top of the carrier plate (3) with a stand (11), a hydraulic cylinder (12) is fixedly installed on the stand (11), an upper pressure head (13) adapted to the molding mold assembly (10) is fixedly installed on the output end of the hydraulic cylinder (12), a cylinder (14) is embedded and fixedly installed on the top of the carrier plate (3), and an ejector plate (14) is fixedly installed on the output end of the cylinder (14). 5), the ejector plate (15) is adapted to the molding die assembly (10), a side fixing plate (16) is fixedly installed on the right side of the top of the bracket (4), a ramp plate (17) is fixedly connected to the left side of the top of the bracket (4), a cylinder (18) is fixedly installed on the top of the side fixing plate (16), a push plate (19) is fixedly installed on the output end of the cylinder (18), and a lifting assembly (20) is provided between the movable cylinder (6) and the base bracket (1); A preforming method for manufacturing a silicon nitride ceramic body, the preforming method steps are as follows: Step 1: Add silicon nitride ceramic raw material into the inner cavity of the outer molding die (101), then the motor (205) works to drive the cam plate (206) to rotate ninety degrees clockwise, the shaft pin (207) on the cam plate (206) causes the inclined push arm (208) to rotate, the bottom inclined push arm (208) is fixed to the bottom plate (201), so that the cam plate (206), the motor (205) and the lifting plate (204) slide on the surface of the slide rail (202) due to the sliding sleeve (203) and move upward, the top inclined push arm (208) pushes the movable cylinder (6) to move upward in the inner cavity of the fixed plate (5), and the movable cylinder (6) drives the shaft rod (7), the rotation drive assembly (8), the rotating plate (9) and the molding die assembly (10) to move upward until the molding die assembly (10) moves to the top of the push plate (19); Step 2: Then the motor 1 (85) drives the gear 2 (86) to rotate, and drives the threaded rod (82) to rotate through the gear 3 (87), and the threaded sleeve (83) moves under the guidance of the thread and the guide rod (88), thereby driving the rack (84) to move, and the rack (84) drives the gear 1 (81) and the shaft (7) to rotate 180 degrees, and the shaft (7) drives the rotating plate (9) to rotate 180 degrees. At this time, the forming mold assembly (10) containing the silicon nitride ceramic raw material enters the inner side and is located directly below the upper pressure head (13), and the forming mold assembly (10) not containing the silicon nitride ceramic raw material is located on the outer side; Step 3: At this time, the motor (205) drives the cam plate (206) to rotate counterclockwise by 90 degrees. Through the cooperation of the shaft pin (207) and the inclined push arm (208), the lifting plate (204) drives the sliding sleeve (203) to slide downward on the surface of the slide rail (202), thereby causing the movable cylinder (6), the shaft rod (7), the rotating drive assembly (8), the rotating plate (9) and the forming mold assembly (10) to move downward, so that the rotating plate (9) falls above the bracket 2 (4) and is located between the side fixed plate (16) and the ramp plate (17). At this time, the hydraulic cylinder (12) drives the upper pressure head (13) to enter the inner cavity of the forming mold (101) to press the silicon nitride ceramic raw material into blocks, and then the hydraulic cylinder (12) drives the upper pressure head (13) to move upward and reset; Step 4: At this time, the cylinder 1 (14) drives the ejector plate (15) to move upward, and the ejector plate (15) extends into the inner cavity of the forming mold (101), and then pushes the mold bottom plate (102) to move upward to eject the formed silicon nitride ceramic raw material out of the inner cavity of the forming mold (101). At this time, the mold bottom plate (102) drives the movable rod (103) and the connecting plate (104) to move upward and squeeze the spring (105), and then the cylinder 2 (18) drives the push plate (19) to move, and the formed silicon nitride ceramic raw material is pushed to the inner cavity of the forming mold (101). The material is discharged from the ramp plate (17) through the guide of the ramp plate (17), and the cylinder (14) drives the ejector plate (15) to retract. At this time, the restoring force of the spring (105) causes the connecting plate (104) and the movable rod (103) to move downward, and the movable rod (103) drives the mold bottom plate (102) to move downward to the bottom of the inner cavity of the molding mold (101) for reset. At this time, a certain amount of silicon nitride ceramic raw material is loaded into the inner cavity of the outer molding mold (101), and the block molding operation is continued according to the above operation.

2. A preforming method for manufacturing a silicon nitride ceramic body according to claim 1, characterized in that: The rotation drive assembly (8) comprises a gear one (81) fixedly connected to the surface of the shaft (7); the inner cavity of the movable cylinder (6) is rotatably connected to a threaded rod (82); the surface of the threaded rod (82) is threadedly connected to a threaded sleeve (83); one side of the threaded sleeve (83) is fixedly connected to a rack (84); the rack (84) is meshed with the gear one (81).

3. A preforming method for manufacturing a silicon nitride ceramic body according to claim 2, characterized in that: The inner cavity of the movable cylinder (6) is fixedly mounted with a motor 1 (85), the output shaft of the motor 1 (85) is fixedly mounted with a gear 2 (86), and the surface of the threaded rod (82) is fixedly connected with a gear 3 (87) meshing with the gear 2 (86).

4. A preforming method for manufacturing a silicon nitride ceramic body according to claim 3, characterized in that: The inner cavity of the movable cylinder (6) is fixedly connected to a guide rod (88), and the threaded sleeve (83) is slidably connected to the surface of the guide rod (88).

5. A preforming method for manufacturing a silicon nitride ceramic body according to claim 4, characterized in that: The lifting assembly (20) comprises a bottom plate (201) fixedly connected to the front side of the top of the base support (1), both sides of the top of the bottom plate (201) are fixedly connected to slide rails (202), the top of the slide rail (202) is fixedly connected to the fixed plate (5), the surface of the slide rail (202) is slidably connected to a slide sleeve (203), and the front sides of the two slide sleeves (203) are fixedly connected to a lifting plate (204).

6. A preforming method for manufacturing a silicon nitride ceramic body according to claim 5, characterized in that: A motor (205) is fixedly mounted on the front side of the lifting plate (204); a cam plate (206) is fixedly mounted on the output shaft of the motor (205); both ends of the front side of the cam plate (206) are fixedly connected with shaft pins (207); a slanted push arm (208) is rotatably connected to the surface of the shaft pin (207); the top of the slanted push arm (208) located at the top is rotatably connected to the movable cylinder (6) via a rotating shaft; and the bottom of the slanted push arm (208) located at the bottom is rotatably connected to the bottom plate (201) via a rotating shaft.

7. A preforming method for manufacturing a silicon nitride ceramic body according to claim 6, characterized in that: Two symmetrical limiting strips (21) are fixedly connected to the surface of the movable cylinder (6), and limiting grooves (22) for the limiting strips (21) to slide are provided on both sides of the inner cavity of the fixed plate (5).

8. A preforming method for manufacturing a silicon nitride ceramic body according to claim 7, characterized in that: The bottom of the rotating plate (9) is fixedly connected to a limit rotating ring (23), and the limit rotating ring (23) is rotatably connected to the top of the surface of the movable cylinder (6).

9. A preforming method for manufacturing a silicon nitride ceramic body according to claim 8, characterized in that: The four corners of the bottom of the mold base plate (102) are fixedly connected to movable rods (103), and the bottom of the movable rod (103) penetrates the bottom of the molding mold (101) and is slidably connected to the molding mold (101).

10. A preforming method for manufacturing a silicon nitride ceramic body according to claim 9, characterized in that: A connecting plate (104) is fixedly connected to the bottom of the movable rod (103), and a spring (105) is welded between the connecting plate (104) and the forming mold (101).

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