Hot pressing sintering device for boron carbide ceramic production

Abstract

The utility model relates to the technical field of hot pressing sintering equipment, in particular to a hot pressing sintering device for boron carbide ceramic production, which comprises a frame, an air guide component, a turntable, a driving component, a support and a vacuum pump, a circular groove, an air hole A and an air hole B are arranged on the frame; the air guide assembly is arranged on the rack and communicates the air hole B with the outside; the rotating disc is rotationally arranged in the circular groove, a bottom die is arranged on the rotating disc, a heat preservation cover with an electric heating coil is arranged outside the bottom die in a sleeving mode, and a pushing assembly is arranged on the rack; the driving assembly is arranged on the rack and drives the turntable to rotate; the support is arranged on the rack, the support is provided with the hydraulic cylinder, the hydraulic cylinder is in driving connection with the mounting plate, the mounting plate is provided with the air guide pipe, the air guide pipe is provided with a side hole A, the air guide pipe is sleeved with the top die and the pressing plate, the pressing plate is provided with the limiting pipe, and the limiting pipe is provided with a side hole B; the input end of the vacuum pump communicates with the gas-guide tube. Through circulating operation of multiple stations, the machining efficiency is improved, and the demolding efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of hot pressing and sintering equipment, in particular to a hot pressing and sintering device for producing boron carbide ceramics. Background Art

[0002] Boron carbide ceramics are a high-performance non-oxide ceramic material with boron carbide as the main component. They are boron-carbon covalent compounds. Boron carbide ceramics have ultra-high hardness and thermal properties. Boron carbide ceramics are mainly made by hot pressing and sintering.

[0003] A Chinese patent with authorization announcement number CN220840704U discloses a hot pressing sintering device for producing boron carbide ceramics. The device is provided with a pressurized mold inside an electric heating furnace. By allowing the air inside the first and second air inlet pipes to smoothly reach the top mold and the bottom mold located inside the electric heating furnace, and through the exhaust mechanism provided inside the top mold and the bottom mold, air can be released on the inner wall of the mold cavity and the outer wall of the extrusion end respectively, so as to form a layer of air film on the inner wall of the mold cavity and the outer wall of the extrusion end, which is conducive to blowing up the boron carbide ceramic raw material adhering to the inner wall of the mold cavity and the outer wall of the extrusion end to prevent sticking, and can accelerate the flow of air on the outer surface of the boron carbide ceramic raw material when exhausting air, which is conducive to the rapid drying of the outer surface of the boron carbide ceramic raw material, thereby facilitating demolding.

[0004] However, the device still has some shortcomings: after the raw material is formed, its outer wall fits tightly with the inner wall of the bottom mold, and it is difficult for gas to enter between the molded part and the inner wall of the bottom mold, resulting in the outer surface of the boron carbide ceramic raw material cannot dry quickly. At the same time, the device only has one workstation. During actual operation, sufficient time is required to load and unload materials, resulting in low production efficiency. Utility Model Content

[0005] The utility model aims to solve the problems existing in the background technology and proposes a hot pressing sintering device for producing boron carbide ceramics.

[0006] The technical solution of the utility model is: a hot pressing sintering device for producing boron carbide ceramics, comprising a frame, a circular groove is arranged on the frame, a processing station, a cooling station, a loading and unloading station and an alternative station are arranged in sequence along the circumferential direction of the circular groove on the frame, and a pore A and a pore B connected with the circular groove are arranged on the cooling station on the frame;

[0007] An air guide component is arranged on the frame and connects the air hole B with the outside world;

[0008] A turntable is rotatably arranged in a circular groove, a plurality of bottom molds are arranged on the turntable in a circular array, a movable plate is slidably arranged at the bottom of the inner cavity of the bottom mold, a heat preservation cover is sleeved on the outside of the bottom mold, an electric heating coil is arranged in the heat preservation cover, the heat preservation cover at the cooling station is connected with both the air hole A and the air hole B, and a push assembly for driving the movable plate on the loading and unloading stations to rise and fall is arranged on the frame;

[0009] A driving assembly, which is arranged on the frame and drives the turntable to rotate;

[0010] The bracket is arranged on the frame, a hydraulic cylinder is arranged on the bracket, the hydraulic cylinder drives and connects to the mounting plate, an air guide tube is arranged on the mounting plate, a side hole A is arranged on the air guide tube, a top mold is sleeved on the air guide tube, the top mold is located directly above the processing station, and a pressing plate adapted to the top mold is slidably arranged on the air guide tube, a limit tube is arranged on the pressing plate, the limit tube passes through the top mold and is slidably connected to the top mold, an electromagnetic valve is arranged in the limit tube, and a side hole B is arranged on the limit tube;

[0011] And a vacuum pump, the vacuum pump is arranged on the bracket, and the input end of the vacuum pump is communicated with the air guide pipe.

[0012] Preferably, the air guide assembly includes a fan; an air collecting hood is arranged on the frame, the fan is arranged on the air collecting hood, and the input end of the fan is connected with the interior of the air collecting hood, an exhaust pipe is arranged on the outside of the air hole B on the frame, and the exhaust pipe is inserted into the air collecting hood and connected with the interior thereof.

[0013] Preferably, a plurality of push holes corresponding to the bottom molds are arranged in a circular array around the axis of the turntable, and a plurality of through holes A and through holes B are arranged in a circular array around the axis of the turntable, the through hole A at the cooling station is connected to the air hole A, and the through hole B at the cooling station is connected to the air hole B.

[0014] Preferably, the pushing assembly includes a pushing rod and a cylinder; a fixed frame is provided on the frame, the pushing rod is slidably provided on the fixed frame, the pushing rod is inserted into the circular groove and is slidably connected to the frame, the pushing rod passes through the pushing hole on the loading and unloading station in the working state and abuts against the movable plate, and a slider is provided at the bottom of the pushing rod, and the slider is slidably connected to the fixed frame; the body of the cylinder is provided on the fixed frame, and the output end of the cylinder is connected to the slider.

[0015] Preferably, an electromagnet is arranged at the top of the push rod, and an iron plate is arranged at the bottom of the movable plate.

[0016] Preferably, a ventilation channel that fits with the bottom end of the air guide tube is provided on the pressure plate.

[0017] Preferably, a limiting ring is provided on the limiting tube, the limiting ring is located above the top mold, and when the lower end surface of the limiting ring contacts the upper end surface of the top mold, the side hole A and the side hole B are both located between the top mold and the pressure plate and are both connected to the ventilation channel.

[0018] Compared with the prior art, the utility model has the following beneficial technical effects:

[0019] By setting a turntable and arranging multiple bottom molds on the turntable, the bottom molds can be switched to the processing stations in turn by driving the turntable to rotate, thereby reducing waiting time and improving processing efficiency; by setting a cooling station and arranging an air guide component on the cooling station, it is convenient to cool the bottom mold on the cooling station, promote the drying of the surface material of the workpiece, and prevent the two from sticking together; by setting a push station and arranging a push component on the push station, it is convenient to push and demould the molded parts with the surface cooled and dried, so as to facilitate the removal of the molded parts; by setting an air guide duct, a fixed top mold is arranged on the air guide duct to and a pressing plate that can slide up and down, and at the same time, side holes are arranged on the air guide pipe, and a limiting tube is arranged on the pressing plate, and a side hole B is arranged on the limiting tube. When the top mold enters the bottom mold and the pressing plate just contacts the material in the bottom mold, the mold cavity is evacuated by a vacuum pump to avoid air interfering with material molding. After the hot pressing is completed, the side holes A, B and the ventilation channel are connected, and the solenoid valve is turned on, so that when the vacuum pump is in working state, the outside air enters between the top mold and the pressing plate along the limiting tube, and the top mold and the pressing plate are cooled by the flowing air, thereby promoting the drying of the material on the upper end surface of the molded part. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0021] Figure 2 It is a schematic diagram of the structure of the rack;

[0022] Figure 3 It is a schematic diagram of the connection structure of various components on the turntable;

[0023] Figure 4 It is a schematic diagram of the connection structure of various components on the bracket;

[0024] Figure 5 Schematic diagram of the connection structure of various components on the air duct.

[0025] Figure numerals: 1, frame; 101, circular groove; 102, air hole A; 103, air hole B; 2, air inlet pipe; 3, exhaust pipe; 4, air collecting hood; 5, fan; 6, fixed frame; 7, push rod; 8, cylinder; 9, turntable; 91, push hole; 92, through hole A; 93, through hole B; 10, motor; 11, bottom mold; 12, movable plate; 13, insulation cover; 14, electric heating coil; 15, bracket; 16, hydraulic cylinder; 17, mounting plate; 18, air guide pipe; 181, side hole A; 19, top mold; 191, pressure plate; 20, limit tube; 2001, side hole B; 21, solenoid valve; 22, inner tube; 23, vacuum pump. DETAILED DESCRIPTION

[0026] Embodiment 1

[0027] like Figure 1-Figure 5As shown, the utility model proposes a hot pressing sintering device for producing boron carbide ceramics, including a frame 1, an air guide assembly, a turntable 9, a driving assembly, a bracket 15 and a vacuum pump 23. A circular groove 101 is arranged on the frame 1, and a processing station, a cooling station, a loading and unloading station and an alternative station are arranged on the frame 1 in sequence along the circumferential direction of the circular groove 101. The frame 1 is provided with an air hole A102 and an air hole B103 connected to the circular groove 101 at the cooling station. The air guide assembly includes a fan 5. An air collecting hood 4 is arranged on the frame 1, and the fan 5 is arranged on the air collecting hood 4, and the input end of the fan 5 is connected to the inside of the air collecting hood 4. An exhaust pipe 3 is arranged on the outside of the air hole B103 on the frame 1, and the exhaust pipe 3 is inserted into the air collecting hood 4 and connected to the inside thereof, and an air inlet pipe 2 is arranged on the outside of the air hole A102 on the frame 1. The turntable 9 is rotatably arranged in the circular groove 101, and a plurality of bottom molds 11 are arranged in an annular array on the turntable 9. A movable plate 12 is slidably arranged at the bottom of the inner cavity of the bottom mold 11. A heat preservation cover 13 is sleeved on the outside of the bottom mold 11, and an electric heating coil 14 is arranged in the heat preservation cover 13. The heat preservation cover 13 at the cooling station is connected to both the air hole A102 and the air hole B103, and a push assembly for driving the movable plate 12 at the loading and unloading station to rise and fall is arranged on the frame 1. A plurality of push holes 91 corresponding to and connected to each bottom mold 11 are arranged in an annular array around the axis of the turntable 9, and a plurality of through holes A92 and through holes B93 are arranged in an annular array around the axis of the turntable 9. The through hole A92 at the cooling station is connected to the air hole A102, and the through hole B93 at the cooling station is connected to the air hole B103. The push assembly includes a push rod 7 and a cylinder 8. A fixed frame 6 is arranged on the frame 1, and a push rod 7 is slidably arranged on the fixed frame 6. The push rod 7 is inserted into the circular groove 101 and is slidably connected to the frame 1. The push rod 7 passes through the push hole 91 on the loading and unloading station in the working state and abuts against the movable plate 12, and a slider is arranged at the bottom of the push rod 7, and the slider is slidably connected to the fixed frame 6. The body of the cylinder 8 is arranged on the fixed frame 6, and the output end of the cylinder 8 is connected to the slider. An electromagnet is arranged at the top of the push rod 7, and an iron plate is arranged at the bottom of the movable plate 12. The driving assembly includes but is not limited to a motor 10, the body of the motor 10 is connected to the frame 1, and the output end of the motor is connected to the mounting shaft of the turntable 9. The bracket 15 is arranged on the frame 1, and a hydraulic cylinder 16 is arranged on the bracket 15. The hydraulic cylinder 16 drives and connects the mounting plate 17. The mounting plate 17 is provided with an air pipe 18, and a side hole A181 is arranged on the air pipe 18. A top die 19 is sleeved on the air pipe 18. The top die 19 is located directly above the processing station, and a pressing plate 191 adapted to the top die 19 is slidably arranged on the air pipe 18. A limit tube 20 is arranged on the pressing plate 191, and the limit tube 20 passes through the top die 19 and is slidably connected thereto. A solenoid valve 21 is arranged in the limit tube 20, and a side hole B2001 is arranged on the limit tube 20. A ventilation channel that fits the bottom end of the air pipe 18 is arranged on the pressing plate 191.A limiting ring is provided on the limiting tube 20, and the limiting ring is located above the top mold 19. When the lower end surface of the limiting ring contacts the upper end surface of the top mold 19, the side hole A181 and the side hole B2001 are both located between the top mold 19 and the pressing plate 191 and are both connected to the ventilation channel. A vacuum pump 23 is provided on the bracket 15, and an inner tube 22 is provided at the input end of the vacuum pump 23, and the other end of the inner tube 22 is inserted into the air guide tube 18 and connected to the inside thereof.

[0028] In this embodiment, the raw materials are added into each bottom mold 11 in sequence at the loading and unloading stations, and the motor 10 drives the turntable 9 to rotate so that each bottom mold 11 reaches the bottom of the processing station in sequence, and the hydraulic cylinder 16 presses down the mounting plate 17 to make the top mold 19 enter the bottom mold 11 and make the pressing plate 191 contact the upper surface of the raw material. At this time, the side hole A181 is connected to the ventilation channel, the solenoid valve 21 is closed, and the vacuum pump 23 is started. The vacuum 23 extracts the air in the mold cavity, and then the electric heating coil 14 is started to heat the bottom mold 11 to increase the temperature in the bottom mold 11. At the same time, the hydraulic cylinder 16 continues to press down the air guide pipe 18, and the top mold 19 first fits with the pressing plate 191 and closes the ventilation channel. Then the top mold 19 cooperates with the pressing plate 191 to press the raw material until the raw material is sintered. Then the hydraulic cylinder 16 pulls up the top mold 19 to keep the pressing plate 191 in contact with the surface of the raw material, and opens the solenoid valve 21. The vacuum pump 23 works and exhausts air, and the outside air flows along the limit pipe 20 to The air enters the gap between the top mold 19 and the pressure plate 191 through the side hole B2001, and enters the air duct 18 along the side hole A181 and is then discharged. The circulating air cools down the pressure plate 191, and then the upper end surface of the molded part cools down and dries quickly. Then the pressure plate 191 rises and separates from the bottom mold 11, and the turntable 9 is rotated to switch it to the cooling station. At this time, the fan 5 is started, and the outside air enters the air collecting hood 4 along the air inlet pipe 2, the air hole A102, the heat preservation cover 13 and the exhaust pipe 3, and is discharged by the fan 5. The circulating air reduces the temperature of the bottom mold, and then the temperature of the surface of the molded part is reduced and quickly dried. Then the turntable 9 rotates, and the bottom mold 11 rotates to the pushing station, and the cylinder 8 pushes the push rod 7 upward until the electromagnet and the iron plate are attracted, and then the movable plate 12 and the molded part in the mold cavity are separated from the bottom mold 11. Then the cylinder 8 is reset and the movable plate 12 is stably reset through the push rod 7 and the matching structure of the electromagnet and the iron block.

[0029] Embodiment 2

[0030] The hot pressing sintering device for producing boron carbide ceramics proposed by the utility model is, compared with the first embodiment, the input end of the air inlet pipe 2 is connected to the bellows, a serpentine channel is arranged in the bellows, the cold end of the refrigerator is inserted into the serpentine channel, and a dustproof net is arranged at the input end of the serpentine channel, and the output end of the serpentine channel is connected to the air inlet pipe 2. The bellows adopts a conventional bellows, and the refrigerator adopts a common compressor type refrigerator.

[0031] In this embodiment, when the fan 5 inhales air, the outside air enters the serpentine channel and is cooled, and the low-temperature air enters the heat preservation cover 13, so that the bottom mold 11 is cooled in a gradient cooling manner by the flowing air, so that the outer surface of the boron carbide ceramic inside it is quickly dried, thereby quickly separating it from the inner wall of the bottom mold 11.

[0032] The implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A hot pressing sintering device for producing boron carbide ceramics, characterized in that: include A frame (1), a circular groove (101) is arranged on the frame (1), a processing station, a cooling station, a loading and unloading station and an alternative station are arranged in sequence on the frame (1) along the circumferential direction of the circular groove (101), and an air hole A (102) and an air hole B (103) which are in communication with the circular groove (101) are arranged on the cooling station on the frame (1); An air guide component, which is arranged on the frame (1) and connects the air hole B (103) with the outside world; A turntable (9), the turntable (9) being rotatably arranged in a circular groove (101), a plurality of bottom molds (11) being arranged in a circular array on the turntable (9), a movable plate (12) being slidably arranged at the bottom of the inner cavity of the bottom mold (11), a heat preservation cover (13) being arranged outside the bottom mold (11), an electric heating coil (14) being arranged inside the heat preservation cover (13), the heat preservation cover (13) being located at the cooling station being connected to both the air hole A (102) and the air hole B (103), and a push assembly for driving the movable plate (12) at the loading and unloading stations to rise and fall is arranged on the frame (1); A driving assembly, the driving assembly being arranged on the frame (1) and driving the turntable (9) to rotate; A support (15), the support (15) being arranged on the frame (1), a hydraulic cylinder (16) being arranged on the support (15), the hydraulic cylinder (16) being driven and connected to a mounting plate (17), an air guide tube (18) being arranged on the mounting plate (17), a side hole A (181) being arranged on the air guide tube (18), a top die (19) being sleeved on the air guide tube (18), the top die (19) being located directly above the processing station, a pressing plate (191) being slidably arranged on the air guide tube (18) and being adapted to the top die (19), a limit tube (20) being arranged on the pressing plate (191), the limit tube (20) penetrating the top die (19) and being slidably connected thereto, a solenoid valve (21) being arranged in the limit tube (20), and a side hole B (2001) being arranged on the limit tube (20); and a vacuum pump (23), wherein the vacuum pump (23) is arranged on the bracket (15), and an input end of the vacuum pump (23) is in communication with the air guide tube (18).

2. A hot pressing sintering device for producing boron carbide ceramics according to claim 1, characterized in that: The air guide assembly comprises a fan (5); an air collecting hood (4) is arranged on the frame (1); the fan (5) is arranged on the air collecting hood (4), and an input end of the fan (5) is communicated with the interior of the air collecting hood (4); an exhaust pipe (3) is arranged on the frame (1) to cover the outside of the air hole B (103); the exhaust pipe (3) is inserted into the air collecting hood (4) and communicated with the interior of the air collecting hood (4).

3. A hot pressing sintering device for producing boron carbide ceramics according to claim 1, characterized in that: A plurality of ejection holes (91) corresponding to and connected to the bottom molds (11) are arranged in a circular array around the axis of the turntable (9), and a plurality of through holes A (92) and through holes B (93) are arranged in a circular array around the axis of the turntable (9), the through hole A (92) at the cooling station is connected to the air hole A (102), and the through hole B (93) at the cooling station is connected to the air hole B (103).

4. A hot pressing sintering device for producing boron carbide ceramics according to claim 3, characterized in that: The push assembly comprises a push rod (7) and a cylinder (8); a fixed frame (6) is arranged on the frame (1), the push rod (7) is slidably arranged on the fixed frame (6), the push rod (7) is inserted into the circular groove (101) and is slidably connected to the frame (1), the push rod (7) passes through the push hole (91) on the loading and unloading station in the working state and abuts against the movable plate (12), and a slider is arranged at the bottom of the push rod (7), and the slider is slidably connected to the fixed frame (6); the body of the cylinder (8) is arranged on the fixed frame (6), and the output end of the cylinder (8) is connected to the slider.

5. A hot pressing sintering device for producing boron carbide ceramics according to claim 4, characterized in that: An electromagnet is arranged at the top of the push rod (7), and an iron plate is arranged at the bottom of the movable plate (12).

6. A hot pressing sintering device for producing boron carbide ceramics according to claim 1, characterized in that: The pressing plate (191) is provided with a ventilation channel which fits with the bottom end of the air guide tube (18).

7. A hot pressing sintering device for producing boron carbide ceramics according to claim 6, characterized in that: A limiting ring is provided on the limiting tube (20), the limiting ring being located above the top mold (19), and when the lower end surface of the limiting ring is in contact with the upper end surface of the top mold (19), the side hole A (181) and the side hole B (2001) are both located between the top mold (19) and the pressing plate (191) and are both connected to the ventilation channel.

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