A silicon nitride powder spray granulation system

Abstract

This invention discloses a silicon nitride powder spray granulation system, relating to the field of silicon nitride powder granulation technology. It includes a mixing mechanism with a feeding mechanism fixedly connected to its top and a forming mechanism fixedly connected to its bottom. The mixing mechanism includes an upper housing, with a set of rotating shafts rotatably connected inside the upper housing. The top of the rotating shafts extends to the outside of the upper housing, and the bottom of the upper housing connects to a lower housing. The bottom of the rotating shafts extends to the inside of the lower housing. A connecting block located inside the upper housing is fixedly connected to the outer wall of the rotating shafts. Two sets of stirring rods are rotatably connected to the outer wall of the connecting block. A set of transmission gears is fixedly connected to the ends of the two sets of stirring rods. A gear ring is fixedly connected to the inner wall of the upper housing, and the two sets of transmission gears mesh with the gear ring. This invention uses a motor to drive the rotating shafts to rotate, which in turn drives the two sets of stirring rods to rotate via the connecting block, allowing the stirring rods to work around the rotating shaft. The interaction between the transmission gears and the gear ring allows the two sets of stirring rods to be assembled, enabling the raw materials inside the upper chamber to be fully driven by the two sets of stirring rods, ensuring the full flow and mixing of the raw materials, thereby guaranteeing the quality of the silicon nitride particles produced later and preventing the nozzle from being blocked.

Description

Technical Field

[0001] This invention relates to the field of silicon nitride powder granulation technology, specifically to a silicon nitride powder spray granulation system. Background Technology

[0002] Silicon nitride ceramic materials possess properties such as high strength, low density, strong wear resistance, good corrosion resistance, high thermal shock resistance, self-lubrication, and good electrical insulation. They are currently the preferred material for the production of various structural ceramic parts and still have enormous development potential. They are widely used in aerospace, machinery, chemical and other fields. Increasing the density of silicon nitride green blanks can effectively increase their density after sintering, reduce porosity, and thus improve the mechanical properties of the blank. The increase in green blank density is largely affected by the loose packing density of the granulated powder. Generally, a higher loose packing density can achieve a higher green blank density under the same pressure. Methods for preparing granulated powder include vacuum ball milling, vibrating screen and double cone mixer method, spray granulation method, etc.

[0003] Existing spray granulation methods involve tempering silicon nitride powder into a slurry, which is then sprayed into a forming chamber through nozzles. During production, the slurry needs to be uniformly mixed. However, in existing devices, the stirring rod is driven by a motor during the tempering process. This means that raw materials deposited at the bottom of the mixing tank cannot be fully mixed, resulting in uneven mixing within the tank. Consequently, when the slurry is sprayed, it fails to form uniform particles and easily leads to nozzle clogging. Furthermore, adding raw materials to the mixing tank requires manual preparation of the various materials according to specific proportions before they can be added and mixed. This makes the spray granulation process time-consuming, labor-intensive, and inefficient. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a silicon nitride powder spray granulation system to solve the technical problem mentioned in the background that the raw materials inside the mixing tank are not mixed evenly, which makes it impossible to form uniform particles when the slurry is sprayed out and easily leads to nozzle clogging.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a silicon nitride powder spray granulation system, comprising a mixing mechanism, wherein a feeding mechanism is fixedly connected to the top end of the mixing mechanism, and a forming mechanism is fixedly connected to the bottom end of the mixing mechanism;

[0006] The mixing mechanism includes an upper housing, inside which a set of rotating shafts are rotatably connected. The top end of the rotating shafts extends to the outside of the upper housing, and the bottom end of the upper housing is connected to a lower housing. The bottom end of the rotating shafts extends to the inside of the lower housing. A connecting block located inside the upper housing is fixedly connected to the outer wall of the rotating shafts. Two sets of stirring rods are rotatably connected to the outer wall of the connecting block. The ends of the two sets of stirring rods are respectively fixedly connected to a set of transmission gears. A gear ring is fixedly connected to the inner wall of the upper housing, and the two sets of transmission gears mesh with the gear ring.

[0007] As a preferred technical solution of the silicon nitride powder spray granulation system of the present invention, the inner wall of the lower box is rotatably connected to an auger, the outer wall of the auger is fixedly sleeved, one end of the rotating shaft located inside the lower box is fixedly connected to the other end of the first bevel gear set, the side wall of the lower box is connected to one end of two sets of pipes, and the other end of the pipes is connected to the interior of the forming mechanism.

[0008] As a preferred technical solution of the silicon nitride powder spray granulation system of the present invention, the mixing mechanism includes multiple sets of storage bins, the multiple sets of storage bins are fixedly connected to the side wall of the upper box, the side wall of each of the multiple sets of storage bins is connected to a set of connecting pipes, and the inner wall of each of the multiple sets of storage bins is rotatably connected to a set of reciprocating screws, the reciprocating screws extending through the connecting pipes to the outside of the connecting pipes.

[0009] As a preferred technical solution of the silicon nitride powder spray granulation system of the present invention, a motor is fixedly connected to the top end of the multiple sets of connecting pipes, the output end of the motor is fixedly connected to the top end of the rotating shaft, one end of the second bevel gear set is fixedly sleeved on the top end of the rotating shaft, and the other end of the second bevel gear set is fixedly connected to the end of the reciprocating screw located outside the connecting pipe.

[0010] As a preferred technical solution of the silicon nitride powder spray granulation system of the present invention, a pushing component is slidably connected to the bottom of the inner wall of the storage bin, the pushing component is threadedly connected to the outer wall of the reciprocating screw, the pushing component includes a sliding frame, the sliding frame is slidably connected to the bottom of the inner wall of the storage bin, and the sliding frame is threadedly connected to the outer wall of the reciprocating screw.

[0011] As a preferred technical solution of the silicon nitride powder spray granulation system of the present invention, a baffle is fixedly connected to the side wall of the sliding frame, a rubber sleeve is fixedly connected to one side of the inner wall of the sliding frame, a slider is fixedly connected to the other side of the rubber sleeve, two sets of limiting pins extending to the outside of the slider are slidably connected to the side wall of the slider, a push rod is slidably connected to the top of the slider, one end of the push rod located inside the slider is hinged to one end of two sets of connecting rods, and the two sets of limiting pins located inside the slider are respectively hinged to the other end of a set of connecting rods.

[0012] As a preferred technical solution of the silicon nitride powder spray granulation system of the present invention, the inner wall of the sliding frame is fixedly connected with multiple sets of limiting teeth, one end of the limiting pin located outside the sliding frame abuts against the side wall of one set of limiting teeth, one end of the push rod located inside the slider is fixedly connected to one end of a return spring, and the other end of the return spring is fixedly connected to the bottom end of the inner wall of the slider.

[0013] As a preferred technical solution of the silicon nitride powder spray granulation system of the present invention, the forming mechanism includes a base, which is fixedly connected to the bottom end of the upper box. Multiple sets of support rollers are fixedly connected to the inner wall of the base. A roller is rotatably sleeved on the inner wall of the base. The top ends of the multiple sets of support rollers simultaneously abut against the outer wall of the roller. A connector extending into the inside of the roller is fixedly connected to the side wall of the base. The side of the connector located outside the roller is connected to the other end of two sets of pipes. The side of the connector located inside the roller is connected to two sets of nozzles. Multiple sets of protrusions are fixedly connected to the inner wall of the roller.

[0014] As a preferred technical solution of the silicon nitride powder spray granulation system of the present invention, an upper synchronous wheel is fixedly connected to one end of the auger outside the lower housing, and a lower synchronous wheel is rotatably connected to the side wall of the base. The upper synchronous wheel is connected to the lower synchronous wheel through a synchronous belt, and two sets of rubber rings are fixedly sleeved on the outer wall of the lower synchronous wheel. The outer walls of the two sets of rubber rings abut against the outer wall of the roller.

[0015] In summary, the present invention has the following main beneficial effects:

[0016] 1. This invention uses a motor to drive a rotating shaft, which in turn drives two sets of stirring rods to rotate via a connecting block. The stirring rods work around the rotating shaft. Through the interaction of transmission gears and gear rings, the two sets of stirring rods are assembled, ensuring that the raw materials inside the upper chamber are fully moved and mixed, guaranteeing the quality of the silicon nitride particles produced later and preventing nozzle blockage.

[0017] 2. This invention uses a motor to drive the second bevel gear set to rotate, which in turn causes multiple sets of reciprocating lead screws to rotate. This causes multiple sets of sliding frames to slide back and forth inside the storage bin, allowing the raw materials inside the multiple sets of storage frames to be added into the upper box. By pushing the push rod, the limiting pin slides into the slider, and then pushes the slider to adjust its position. This causes the slider to expand and contract the rubber sleeve, thereby adjusting the volume inside the sliding frame. This changes the amount of raw material clinker that the sliding frame moves each time, achieving the purpose of adjusting the proportion between different raw materials.

[0018] 3. The present invention drives the drum to rotate during the rotation of the auger and blows hot air into the drum through the opening on the drum, so that the slurry sprayed into the drum becomes dry and forms a smooth surface as the drum rotates continuously. The drum drives the convex strip to flip during the rotation, so that the smooth surface and slurry inside the drum are fully moved and sufficient friction is generated between the particles, making the surface of the particles smoother. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0020] Figure 2 This is an enlarged structural diagram of point A in the present invention;

[0021] Figure 3 This is a side view of the structure of the present invention;

[0022] Figure 4 This is a schematic cross-sectional view of the upper and lower housings of the present invention;

[0023] Figure 5 This is a schematic diagram of the molding mechanism of the present invention.

[0024] Figure 6 This is a schematic cross-sectional view of the feeding mechanism of the present invention.

[0025] Figure 7 This is a top view cross-sectional structural diagram of the feeding assembly of the present invention.

[0026] Figure 8 This is a schematic diagram of the cross-sectional structure of the slider of the present invention.

[0027] In the diagram: 1. Mixing mechanism; 2. Feeding mechanism; 3. Molding mechanism;

[0028] 101. Upper housing; 102. Rotating shaft; 103. Connecting block; 104. Stirring rod; 105. Transmission gear; 106. Gear ring; 107. Lower housing; 108. Screwdriver; 109. Pipe; 110. First bevel gear set;

[0029] 201. Storage bin; 202. Connecting pipe; 203. Motor; 204. Second bevel gear set; 205. Reciprocating lead screw; 206. Pushing assembly; 2061. Sliding frame; 2062. Rubber sleeve; 2063. Slider; 2064. Limit pin; 2065. Push rod; 2066. Connecting rod; 2067. Limiting tooth; 2068. Return spring; 207. Baffle;

[0030] 301. Base; 302. Support roller; 303. Roller; 304. Upper synchronous pulley; 305. Lower synchronous pulley; 306. Synchronous belt; 307. Rubber ring; 308. Raised strip; 309. Nozzle; 310. Connector. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0032] The embodiments of the present invention will now be described.

[0033] A silicon nitride powder spray granulation system, such as Figure 1-8 As shown, it includes a mixing mechanism 1, a feeding mechanism 2 fixedly connected to the top of the mixing mechanism 1, and a molding mechanism 3 fixedly connected to the bottom of the mixing mechanism 1.

[0034] The mixing mechanism 1 includes an upper housing 101. A set of rotating shafts 102 are rotatably connected inside the upper housing 101. The top end of the rotating shafts 102 extends to the outside of the upper housing 101. The bottom end of the upper housing 101 is connected to a lower housing 107. The bottom end of the rotating shafts 102 extends into the interior of the lower housing 107. A connecting block 103 located inside the upper housing 101 is fixedly connected to the outer wall of the rotating shafts 102. Two sets of stirring rods 104 are rotatably connected to the outer wall of the connecting block 103. The ends of the two sets of stirring rods 104 are respectively fixed... A set of transmission gears 105 is connected, and a gear ring 106 is fixedly connected to the inner wall of the upper housing 101. The two sets of transmission gears 105 mesh with the gear ring 106. An auger 108 is rotatably connected to the inner wall of the lower housing 107. The outer wall of the auger 108 is fixedly sleeved with a rotating shaft 102 located inside the lower housing 107. The other end of the first bevel gear set 110 is fixedly connected to one end of the shaft 102. The side wall of the lower housing 107 is connected to one end of two sets of pipes 109. The other end of the pipes 109 is connected to the interior of the forming mechanism 3.

[0035] The rotating shaft 102 rotates, which in turn drives the connecting block 103 to rotate, causing the two sets of stirring rods 104 to rotate. During the rotation of the two sets of stirring rods 104, the two sets of stirring rods 104 drive the two sets of transmission gears 105 to rotate, so that the two sets of transmission gears 105 directly mesh with the gear ring 106 and rotate. Thus, the two sets of stirring rods 104 rotate on their own axis during the revolution. In addition, the rotating shaft 102 can drive the first bevel gear set 110 to rotate, which in turn drives the auger 108 to rotate, so that the auger 108 pushes the softened slurry inside the upper box 101 into the pipe 109.

[0036] Please refer to this carefully. Figure 1-8The mixing mechanism 1 includes multiple storage bins 201, which are fixedly connected to the side walls of the upper housing 101. Each storage bin 201 has a connecting pipe 202 connected to its side wall. A reciprocating screw 205 is rotatably connected to the inner wall of each storage bin 201. The reciprocating screw 205 passes through the connecting pipe 202 and extends to the outside of the connecting pipe 202. A motor 203 is fixedly connected to the top of each connecting pipe 202. The output end of the motor 203 is fixedly connected to the top of a rotating shaft 102. One end of the second bevel gear set 204 is fixedly sleeved at the top of the 102. The other end of the reciprocating screw 205 located outside the connecting pipe 202 is fixedly connected to the other end of the second bevel gear set 204. A pusher assembly 206 is slidably connected to the bottom of the inner wall of the storage bin 201. The pusher assembly 206 is threadedly connected to the outer wall of the reciprocating screw 205. The pusher assembly 206 includes a sliding frame 2061, which is slidably connected to the bottom of the inner wall of the storage bin 201 and threadedly connected to the reciprocating screw. A baffle 207 is fixedly connected to the outer wall of the sliding frame 2061. A rubber sleeve 2062 is fixedly connected to one side of the inner wall of the sliding frame 2061. A slider 2063 is fixedly connected to the other side of the rubber sleeve 2062. Two sets of limiting pins 2064 extending to the outside of the slider 2063 are slidably connected to the side wall of the slider 2063. A push rod 2065 is slidably connected to the top of the slider 2063. One end of the push rod 2065 located inside the slider 2063 is hinged to one end of two sets of connecting rods 2066. Two sets of limiting pins 2064 are located inside the slider 2063, and one end of each set of connecting rods 2066 is hinged to the other end of the slider 2066. Multiple sets of limiting teeth 2067 are fixedly connected to the inner wall of the sliding frame 2061. One end of the limiting pin 2064 located outside the sliding frame 2061 abuts against the side wall of a set of limiting teeth 2067. One end of the push rod 2065 located inside the slider 2063 is fixedly connected to one end of a return spring 2068. The other end of the return spring 2068 is fixedly connected to the bottom end of the inner wall of the slider 2063.

[0037] The motor 203 drives the rotating shaft 102 to rotate, which in turn drives the second bevel gear set 204 to rotate. This, in turn, drives multiple sets of reciprocating screws 205 to rotate simultaneously. During this rotation, the reciprocating screws 205 push the sliding frame 2061, causing it to slide from the storage bin 201 into the connecting pipe 202, and then back into the storage bin 201, repeating this reciprocating motion. As the sliding frame 2061 slides into the storage bin 201, the material inside the storage bin 201 enters the sliding frame 2061. After the sliding frame 2061 enters the connecting pipe 202, the material inside the sliding frame 2061 slides into the upper housing 101 through the connecting pipe 202. Pushing the push rod 2065 causes it to push two sets of connecting rods 2066, which in turn drive two sets of limit pins 2064 to slide into the sliding frame. Inside block 2063, the limiting pin 2064 cannot contact the slider 2063, allowing the slider 2063 to slide freely on the inner wall of the sliding frame 2061. Pushing the slider 2063 to slide causes the rubber sleeve 2062 to unfold or fold, thus partially blocking the internal space of the sliding frame 2061 and adjusting its internal volume. Then, releasing the push rod 2065 causes the return spring 2068 to rebound and push the push rod 2065 back to its original position. This causes the push rod 2065 to drive the limiting pin 2064 back to its original position. At this point, the limiting pin 2064 contacts the limiting tooth 2067, blocking the limiting pin 2064 and preventing the slider 2063 from sliding. This results in different quantities of raw materials being conveyed by the multiple sliding frames 2061 each time they slide, thereby adjusting the proportion of various raw materials in the slurry.

[0038] Please refer to this carefully. Figure 1-8 The molding mechanism 3 includes a base 301, which is fixedly connected to the bottom end of the upper housing 101. Multiple sets of support rollers 302 are fixedly connected to the inner wall of the base 301. A roller 303 is rotatably sleeved on the inner wall of the base 301. The top ends of the multiple sets of support rollers 302 simultaneously abut against the outer wall of the roller 303. A connector 310 extending into the roller 303 is fixedly connected to the side wall of the base 301. The connector 310, located on the outside of the roller 303, connects to the other ends of two sets of pipes 109. Two sets of nozzles 309 are connected to one side of the roller 303. Multiple sets of protruding strips 308 are fixedly connected to the inner wall of the roller 303. An upper synchronous pulley 304 is fixedly connected to one end of the auger 108 located outside the lower housing 107. A lower synchronous pulley 305 is rotatably connected to the side wall of the base 301. The upper synchronous pulley 304 is connected to the lower synchronous pulley 305 through a synchronous belt 306. Two sets of rubber rings 307 are fixedly sleeved on the outer wall of the lower synchronous pulley 305. The outer walls of the two sets of rubber rings 307 abut against the outer wall of the roller 303.

[0039] After the slurry enters the pipe 109, it enters the connector 310 and is then sprayed out through the nozzle 309. As the auger 108 rotates, it drives the upper synchronous wheel 304 to rotate. The upper synchronous wheel 304 drives the lower synchronous wheel 305 to rotate through the synchronous belt 306. At this time, the lower synchronous wheel 305 drives the rubber ring 307 to rotate, which in turn pushes the roller 303 to rotate at the top of the support roller 302. The roller 303 drives the convex strip 308 to flip, so that the silicon nitride particles are pushed and flipped continuously by the convex strip 308 during the formation process, making the silicon nitride particles more compact and the outer wall smoother.

[0040] In use, the motor 203 drives the rotating shaft 102 to rotate, which in turn drives the two sets of stirring rods 104 to rotate via the connecting block 103. The stirring rods 104 work around the rotating shaft 102. Through the cooperation of the transmission gear 105 and the gear ring 106, the two sets of stirring rods 104 are assembled, ensuring that the raw materials inside the upper housing 101 are fully stirred and mixed by the two sets of stirring rods. This guarantees the quality of the silicon nitride particles produced later and prevents the nozzle from being blocked.

[0041] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A silicon nitride powder spray granulation system, comprising a mixing mechanism (1), characterized in that: The top end of the mixing mechanism (1) is fixedly connected to the feeding mechanism (2), and the bottom end of the mixing mechanism (1) is fixedly connected to the molding mechanism (3). The mixing mechanism (1) includes an upper box (101), a set of rotating shafts (102) are rotatably connected inside the upper box (101), the top end of the rotating shafts (102) extends to the outside of the upper box (101), the bottom end of the upper box (101) is connected to a lower box (107), the bottom end of the rotating shafts (102) extends to the inside of the lower box (107), a connecting block (103) located inside the upper box (101) is fixedly connected to the outer wall of the rotating shafts (102), two sets of stirring rods (104) are rotatably connected to the outer wall of the connecting block (103), a set of transmission gears (105) are fixedly connected to the ends of the two sets of stirring rods (104), and a gear ring (106) is fixedly connected to the inner wall of the upper box (101), and the two sets of transmission gears (105) mesh with the gear ring (106); The feeding mechanism (2) includes multiple sets of storage bins (201), which are fixedly connected to the side wall of the upper box (101). The side walls of the multiple sets of storage bins (201) are respectively connected to a set of connecting pipes (202), and the inner walls of the multiple sets of storage bins (201) are respectively rotatably connected to a set of reciprocating screws (205). The reciprocating screws (205) extend through the connecting pipes (202) to the outside of the connecting pipes (202). The bottom of the inner wall of the storage bin (201) is slidably connected to a pusher assembly (206), which is threadedly connected to the outer wall of the reciprocating screw (205). The pusher assembly (206) includes a sliding frame (2061), which is slidably connected to the bottom of the inner wall of the storage bin (201) and threadedly connected to the outer wall of the reciprocating screw (205). A baffle (207) is fixedly connected to the side wall of the sliding frame (2061). A rubber sleeve (2062) is fixedly connected to one side of the inner wall of the sliding frame (2061). A slider (2063) is fixedly connected to the other side of the rubber sleeve (2062). Two sets of limiting pins (2064) extending to the outside of the slider (2063) are slidably connected to the side wall of the slider (2063). A push rod (2065) is slidably connected to the top of the slider (2063). One end of the push rod (2065) inside the slider (2063) is hinged to one end of two sets of connecting rods (2066). One end of the two sets of limiting pins (2064) inside the slider (2063) is respectively hinged to the other end of a set of connecting rods (2066). The inner wall of the sliding frame (2061) is fixedly connected with multiple sets of limiting teeth (2067). One end of the limiting pin (2064) located outside the sliding frame (2061) abuts against the side wall of a set of limiting teeth (2067). One end of the push rod (2065) located inside the slider (2063) is fixedly connected to one end of a return spring (2068). The other end of the return spring (2068) is fixedly connected to the bottom end of the inner wall of the slider (2063). The forming mechanism (3) includes a base (301), which is fixedly connected to the bottom of the upper box (101). Multiple sets of support rollers (302) are fixedly connected to the inner wall of the base (301). A roller (303) is rotatably sleeved on the inner wall of the base (301). The top ends of the multiple sets of support rollers (302) simultaneously abut against the outer wall of the roller (303). A connector (310) extending into the inside of the roller (303) is fixedly connected to the side wall of the base (301).

2. The silicon nitride powder spray granulation system according to claim 1, characterized in that: The inner wall of the lower housing (107) is rotatably connected to an auger (108). The shaft (102) located inside the lower housing (107) is fixedly connected to the other end of the first bevel gear set (110). The side wall of the lower housing (107) is connected to one end of two sets of pipes (109), and the other end of the pipes (109) is connected to the interior of the forming mechanism (3).

3. The silicon nitride powder spray granulation system according to claim 1, characterized in that: A motor (203) is fixedly connected to the top end of the multiple sets of connecting pipes (202). The output end of the motor (203) is fixedly connected to the top end of the rotating shaft (102). One end of the second bevel gear set (204) is fixedly sleeved on the top end of the rotating shaft (102). The other end of the reciprocating screw (205) located outside the connecting pipe (202) is fixedly connected to the other end of the second bevel gear set (204).

4. The silicon nitride powder spray granulation system according to claim 2, characterized in that: The connector (310) is located on the outside of the roller (303) and connected to the other end of two sets of pipes (109). The connector (310) is located on the inside of the roller (303) and connected to two sets of nozzles (309). Multiple sets of protrusions (308) are fixedly connected to the inner wall of the roller (303).

5. The silicon nitride powder spray granulation system according to claim 4, characterized in that: The auger (108) is fixedly connected to an upper synchronous pulley (304) at one end outside the lower housing (107). The side wall of the base (301) is rotatably connected to a lower synchronous pulley (305). The upper synchronous pulley (304) is connected to the lower synchronous pulley (305) via a synchronous belt (306). The outer wall of the lower synchronous pulley (305) is fixedly fitted with two sets of rubber rings (307). The outer walls of the two sets of rubber rings (307) abut against the outer wall of the roller (303).

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