Pelletizing and pressing integrated device for silicon carbide porous ceramics

Abstract

The utility model belongs to the technical field of silicon carbide granulation and pressing, and discloses a granulation and pressing integrated device for silicon carbide porous ceramics, which is characterized in that a spray nozzle is arranged in the center of the top of a granulation tower, an inlet of the spray nozzle is connected with a silicon carbide slurry conveying system, and an air heater is arranged below the spray nozzle in the granulation tower; the bottom of the granulation tower is provided with a feed opening, the feed end of the conveying system is connected with the feed opening of the granulation tower, the discharge end of the conveying system extends to a feed opening of the vibration discharge device, the pressing device is arranged below a discharge opening of the vibration discharge device, and the scraping device is arranged on one side of the pressing device. And the scraping device is used for filling the silicon carbide particles falling from the discharge hole of the vibration blanking device of the pressing device into the cavity of the pressing device and scraping the surfaces of the silicon carbide particles at the opening part of the cavity to be flat. According to the automatic processing device, automatic processing of silicon carbide ceramic biscuits can be realized, the production efficiency is greatly improved, and the labor cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of silicon carbide granulation and pressing, in particular to an integrated granulation and pressing device for silicon carbide porous ceramics. Background Art

[0002] As a third-generation new chip heat dissipation material, aluminum silicon carbide has the characteristics of high specific strength, high thermal conductivity, and excellent thermal stability. It is widely used in high-speed rail, aerospace, new energy vehicles and other fields. Silicon carbide porous ceramic preforms are a crucial link in the preparation process of aluminum silicon carbide composite materials. The preparation efficiency of qualified silicon carbide dry-pressed blanks greatly affects the cost and efficiency of aluminum silicon carbide finished products. The existing silicon carbide ceramic powder is prepared by kneading, drying naturally, and swinging and extruding. At the same time, before pressing, the corresponding weight needs to be weighed manually (the accuracy is controlled within ±1g), and then poured into the mold respectively, and the material is manually scraped flat with a scraper. The powder prepared by kneading, drying naturally, and swinging and extruding has poor fluidity and cannot be automatically weighed. It needs to be weighed manually, poured into the corresponding mold, scraped flat, and pressed into a ceramic blank, which greatly increases the labor cost, is inefficient, and has poor stability. Summary of the invention

[0003] The purpose of the utility model is to provide a granulation and pressing integrated device for silicon carbide porous ceramics to solve the problems raised in the above-mentioned background technology, improve production efficiency and reduce labor costs.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A granulation and pressing integrated device for silicon carbide porous ceramics comprises a silicon carbide slurry conveying system, a spray nozzle, a granulation tower, a conveying system, a vibrating feeding device, a scraping device and a pressing device; the spray nozzle is arranged at the top center of the granulation tower, the inlet of the spray nozzle is connected to the silicon carbide slurry conveying system, a hot air blower is arranged below the spray nozzle in the granulation tower, the hot air blower is used to dry the mist silicon carbide slurry sprayed by the spray nozzle, a feeding port is arranged at the bottom of the granulation tower, the feeding end of the conveying system is connected to the feeding port of the granulation tower, the discharging end of the conveying system extends to the feeding port of the vibrating feeding device, the pressing device is arranged below the discharging port of the vibrating feeding device, the scraping device is arranged on one side of the pressing device, the scraping device is used to fill the silicon carbide particles falling from the discharging port of the vibrating feeding device of the pressing device into the cavity of the pressing device and to scrape the surface of the silicon carbide particles at the cavity opening.

[0006] Preferably, the spray head of the spray nozzle is in the shape of an inverted funnel.

[0007] Preferably, the shape of the granulation tower is funnel-shaped.

[0008] Preferably, a plurality of ultrasonic vibration devices are provided around the granulation tower below the spray nozzle.

[0009] Preferably, a plurality of hot air blowers are arranged below the spray nozzles on the granulation tower, and the air outlet direction of the hot air blowers is inclined upward.

[0010] Preferably, the conveying system adopts a fish-filled transmission feeding device.

[0011] Preferably, the vibrating feeding device is provided with a plurality of discharge ports, and a screen is provided at the entrance of each discharge port.

[0012] Preferably, the pressing device includes a movable mold and a fixed mold, the fixed mold is fixedly arranged, the movable mold is arranged above the fixed mold, a plurality of cavities are arranged on the upper surface of the fixed mold, a pressure head matching the cavity is arranged above each cavity on the movable mold, and a scraper device is arranged on one side of the fixed mold.

[0013] Preferably, the pressure head and the movable mold are connected via a spring.

[0014] Preferably, the scraper device includes a drive motor, a telescopic arm and a scraper. The output shaft of the drive motor is connected to one end of the telescopic arm. The drive motor can drive the telescopic arm to extend or shorten. The other end of the telescopic arm is connected to the scraper. The scraper is used to fill the silicon carbide particles falling from the discharge port of the vibrating feeding device of the pressing device into the cavity of the pressing device and scrape the surface of the silicon carbide particles at the mouth of the cavity flat.

[0015] The utility model has the following beneficial effects:

[0016] In the utility model, the silicon carbide slurry conveying system can be used to convey silicon carbide slurry to the spray nozzle, and the silicon carbide slurry can be atomized into small droplets of silicon carbide slurry after passing through the spray nozzle. A hot air blower is provided below the spray nozzle in the granulation tower, so that the small droplets of silicon carbide slurry will be dried by the hot air output by the hot air blower during the falling process, and the small droplets dried by the hot air blower become dry granules (or powder); the granules are conveyed to the vibrating discharge device through the discharge port at the bottom of the granulation tower by the conveying system, and the vibrating discharge device can continuously feed the pressing device. Since the surface of the granules has friction, the granules in the vibrating discharge device can be made to drop while vibrating by the vibrating discharge device, so that the granules can be ensured to fall smoothly and prevent jamming; the pressing device can press the granules to obtain silicon carbide ceramic blanks. During the pressing process of the pressing device, the scraping device is provided to push the material dropped from the vibrating feeding device into the cavity of the pressing device and to scrape the surface of the silicon carbide particles at the mouth of the cavity flat, so that the amount of particles required for each silicon carbide ceramic blank is certain, ensuring the stability of the quality of the silicon carbide ceramic blank, and no manual weighing is required. It can be seen from the above that the utility model can realize the automatic processing of silicon carbide ceramic blanks, greatly improve production efficiency, and reduce labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the granulation and pressing integrated device for silicon carbide porous ceramics of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the pressing device of the utility model.

[0019] In the figure, 1-slurry, 2-extrusion pump, 3-handle, 4-rubber plug, 5-spray nozzle, 6-ultrasonic vibration device, 7-hot air blower, 8-transmission motor, 9-fish fillet transmission feeding device, 10-vibration unloading device, 11-screen, 12-spring, 13-drive motor, 14-fixed mold, 15-first base, 16-pillar, 17-scraper, 18-second base, 19-pressing head, 20-movable mold, 21-hydraulic press, 22-granulation tower. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] like Figure 1 As shown, the utility model of the granulation and pressing integrated device for silicon carbide porous ceramics includes a silicon carbide slurry conveying system, a spray nozzle 5, a granulation tower 22, a conveying system, a vibrating feeding device 10, a scraping device and a pressing device; the spray nozzle 5 is arranged at the top center of the granulation tower 22, and the inlet of the spray nozzle 5 is connected to the silicon carbide slurry conveying system. A hot air blower 7 is provided below the spray nozzle 5 in the granulation tower 22, and the hot air blower 7 is used to dry the mist silicon carbide slurry sprayed by the spray nozzle 5. A feeding port is provided at the bottom of the granulation tower 22, and the feed end of the conveying system is connected to the feeding port of the granulation tower 22, and the discharge end of the conveying system extends to the feed port of the vibrating feeding device 10. The pressing device is arranged below the discharge port of the vibrating feeding device 10, and the scraping device is arranged on one side of the pressing device. The scraping device is used to fill the silicon carbide particles falling from the discharge port of the vibrating feeding device 10 of the pressing device into the cavity of the pressing device and scrape the surface of the silicon carbide particles at the mouth of the cavity flat.

[0022] When the utility model is used, the integrated granulation and pressing device for silicon carbide porous ceramics, the silicon carbide slurry conveying system conveys the slurry to the spray nozzle 5, the spray nozzle 5 atomizes the silicon carbide slurry into small droplets, the atomized small droplets contact the hot air blown by the hot air blower 7 during the falling process, and are dried by the hot air into granular materials (or powdered materials, which is related to the particle size of the small droplets. Whether it is powdered materials or granular materials can be determined according to actual conditions. Both materials can be pressed into silicon carbide ceramic blanks in the subsequent blank making process); the dried granular materials enter the conveying system through the discharge port of the granulation tower 22, and the conveying system conveys the granular materials to the vibrating discharge device 10. Since the particle size of the obtained granular materials is small, it is necessary to use the vibrating discharge device 10 to discharge the materials while vibrating, otherwise it is easy to cause material accumulation and poor discharge. The material dropped by the vibrating feeding device 10 falls into the pressing device, and then the scraping device is used to push the granular material to fill the cavity of the pressing device and scrape the surface of the silicon carbide particles at the mouth of the cavity flat, and then the pressing device is used to press the material in the cavity into a silicon carbide ceramic blank.

[0023] In the above scheme of the utility model, the silicon carbide slurry conveying system can adopt an extrusion pump 2, which can convey the ground slurry to the spray nozzle 5 by extruding a colloid hose. The nozzle of the spray nozzle 5 is in the shape of an inverted funnel. The shape of the granulation tower 22 is funnel-shaped, which is used to prepare silicon carbide particles on the one hand, and can also store a certain amount of silicon carbide particles on the other hand to ensure the stability of production during continuous production. A plurality of ultrasonic vibration devices 6 are arranged around the granulation tower 22 below the spray nozzle 5, and the ultrasonic vibration devices 6 can excite high-frequency vibration, and the high-frequency vibration can make the silicon carbide particles fall evenly. A plurality of hot air blowers 7 are arranged below the spray nozzle 5 on the granulation tower 22, and the air outlet direction of the hot air blower 7 is inclined upward. The hot air blower 7 can adopt a high-power hot air blower, so that the liquid slurry sprayed out can be quickly dried. The conveying system adopts a fish-shaped transmission feeding device 9, which can use the baffle on it to scrape away the silicon carbide particles from the discharge port of the granulation tower 22 to ensure normal and quantitative feeding. The vibrating feeding device 10 is provided with a plurality of discharge ports, and a screen 11 is provided at the entrance of each discharge port. The screen 11 can be used to vibrate and sieve the prepared powder particles and then evenly fill them into the pressing mold.

[0024] A layer of fine isolation mesh can be riveted and fastened at the air outlet of the hot air blower 7 on the granulation tower 22 to prevent a large amount of silicon carbide powder from entering the hot air blower 7. In addition, it can evenly distribute the hot air flow field of the hot air blower 7, thereby ensuring that the hot air is fully in contact with the atomized droplets and is dried.

[0025] The front end of the fish-shaped transmission feeding device 9 is connected to the transmission motor 8. Each grid of the rubber crawler on the fish-shaped transmission feeding device 9 is evenly embedded in a PVC partition with the same height, and the rubber crawler is tightly fitted on the concentric roller of the front terminal.

[0026] The spray nozzle 5 is made of stainless steel, and the spray hole size is micro-nano scale.

[0027] like Figure 2 As shown, the pressing device of the utility model can adopt the following structure: it includes a movable mold 20 and a fixed mold 14, the fixed mold 14 is fixedly arranged on the second base 18 through a support 16, the movable mold 20 is arranged above the fixed mold 14, and a plurality of cavities are arranged on the upper surface of the fixed mold 14. A pressure head 19 adapted to the cavity is arranged above each cavity on the movable mold 20, and a scraper device is arranged on one side of the fixed mold, and the upper surface area of ​​the fixed mold 14 is larger than that of the fixed mold 14, so that the excess area is used to temporarily store materials, which is convenient for the operation of the scraper device.

[0028] In the above scheme of the utility model, the movable mold 20 can be set to move up and down as a whole, or the movable mold 20 body can be stationary and only the pressure head 19 can move up and down. Both of the above forms are acceptable, and the specific movement can be carried out by hydraulic control. Technical personnel in this field can flexibly select according to actual conditions.

[0029] As a preferred solution of the above scheme, the ram 19 and the movable mold can be connected by a spring 12. On the one hand, the spring 12 can prevent the ram 19 from acting too strongly on the cavity of the fixed mold 14, thereby preventing damage to the ram 19 and the cavity. On the other hand, within the stroke range of the ram 19, the spring 12 can increase the contact time between the ram 19 and the material, thereby improving the pressing effect and reducing the porosity in the silicon carbide ceramic blank.

[0030] As a preferred embodiment of the above scheme, the scraper device includes a drive motor 13, a telescopic arm and a scraper 17. The output shaft of the drive motor 13 is connected to one end of the telescopic arm. The drive motor 13 can drive the telescopic arm to extend or shorten. The other end of the telescopic arm is connected to the scraper 17. The scraper 17 is used to fill the silicon carbide particles falling from the discharge port of the vibrating feeding device 10 of the pressing device into the cavity of the pressing device and scrape the surface of the silicon carbide particles at the mouth of the cavity flat.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A granulation and pressing integrated device for silicon carbide porous ceramics, characterized in that: The invention comprises a silicon carbide slurry conveying system, a spray nozzle (5), a granulation tower (22), a conveying system, a vibrating feeding device (10), a scraping device and a pressing device; the spray nozzle (5) is arranged at the top center of the granulation tower (22), the inlet of the spray nozzle (5) is connected to the silicon carbide slurry conveying system, and a hot air blower (7) is arranged below the spray nozzle (5) in the granulation tower (22), and the hot air blower (7) is used to dry the mist silicon carbide slurry sprayed by the spray nozzle (5) to granulate. A discharge port is provided at the bottom of the tower (22), a feed end of a conveying system is connected to the discharge port of the granulation tower (22), a discharge end of the conveying system extends to the feed port of a vibrating discharge device (10), a pressing device is arranged below the discharge port of the vibrating discharge device (10), a scraping device is arranged on one side of the pressing device, and the scraping device is used to fill the silicon carbide particles falling from the discharge port of the vibrating discharge device (10) of the pressing device into the cavity of the pressing device and to scrape the surface of the silicon carbide particles at the mouth of the cavity flat.

2. The integrated granulation and pressing device for silicon carbide porous ceramics according to claim 1, characterized in that: The spray head of the spray nozzle (5) is in the shape of an inverted funnel.

3. The integrated granulation and pressing device for silicon carbide porous ceramics according to claim 1, characterized in that: The shape of the granulation tower (22) is funnel-shaped.

4. The integrated granulation and pressing device for silicon carbide porous ceramics according to claim 1, characterized in that: A plurality of ultrasonic vibration devices (6) are arranged around the granulation tower (22) below the spray nozzle (5).

5. The integrated granulation and pressing device for silicon carbide porous ceramics according to claim 1, characterized in that: A plurality of hot air blowers (7) are arranged below the spray nozzles (5) on the granulation tower (22), and the air outlet direction of the hot air blowers (7) is inclined upward.

6. The integrated granulation and pressing device for silicon carbide porous ceramics according to claim 1, characterized in that: The conveying system adopts a fish-row-shaped transmission feeding device (9).

7. The integrated granulation and pressing device for silicon carbide porous ceramics according to claim 1, characterized in that: The vibrating material discharge device (10) is provided with a plurality of discharge ports, and a screen (11) is provided at the entrance of each discharge port.

8. The integrated granulation and pressing device for silicon carbide porous ceramics according to claim 7, characterized in that: The pressing device comprises a movable mold and a fixed mold. The fixed mold is fixedly arranged. The movable mold is arranged above the fixed mold. A plurality of cavities are arranged on the upper surface of the fixed mold. A pressing head (19) matching the cavity is arranged above each cavity on the movable mold. The scraping device is arranged on one side of the fixed mold.

9. The integrated granulation and pressing device for silicon carbide porous ceramics according to claim 8, characterized in that: The pressing head (19) is connected to the movable mold via a spring (12).

10. The integrated granulation and pressing device for silicon carbide porous ceramics according to claim 1, characterized in that: The scraper device comprises a drive motor (13), a telescopic arm and a scraper (17); the output shaft of the drive motor (13) is connected to one end of the telescopic arm; the drive motor (13) can drive the telescopic arm to extend or shorten; the other end of the telescopic arm is connected to the scraper (17); the scraper (17) is used to fill the silicon carbide particles falling from the discharge port of the vibrating discharge device (10) of the pressing device into the mold cavity of the pressing device and to scrape the surface of the silicon carbide particles at the mouth of the mold cavity flat.

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