CN215810224U - Silica flour feed arrangement - Google Patents

Abstract

The utility model discloses a silicon powder feeding device which comprises at least one transport vehicle, wherein the transport vehicle comprises a supporting plate, wheels are arranged below the supporting plate, a reinforcing ring is arranged around the upper part of the supporting plate, the supporting plate and the reinforcing ring are formed by adopting an integrated structure, connecting holes are respectively arranged at two ends of the transport vehicle and penetrate through the reinforcing ring and the supporting plate in the vertical direction, a plurality of rectangular limiting grooves and air holes are uniformly arranged on the supporting plate surrounded by the reinforcing ring at intervals, the air holes penetrate through the supporting plate in the vertical direction, a sagger group can be arranged on each limiting groove, each sagger group comprises a plurality of saggers overlapped in the vertical direction, and silicon powder is contained in the saggers. The device improves the operation efficiency of filling silicon powder materials and removing products.

Description

Silica flour feed arrangement

Technical Field

The utility model particularly relates to a silicon powder feeding device, and belongs to the technical field of silicon nitride preparation.

Background

Silicon nitride is an important structural ceramic material, has the characteristics of super hardness, lubricity, wear resistance, oxidation resistance at high temperature, cold and hot shock resistance and the like, has excellent performances of high thermal stability, high product dimensional accuracy and the like, and is often used for manufacturing mechanical components such as bearings, gas turbine blades, mechanical seal rings, permanent molds, engine parts and the like. The silicon nitride powder is a key core raw material for preparing the silicon nitride ceramic part, and has two crystal forms, namely alpha-phase silicon nitride and beta-phase silicon nitride. The alpha-phase silicon nitride belongs to low-temperature stability, and the beta-phase silicon nitride belongs to high-temperature stability. The free energy of the alpha-phase silicon nitride is higher than that of the beta-phase silicon nitride, so the sintering performance of the alpha-phase silicon nitride powder is better than that of the beta-phase silicon nitride powder. The alpha-phase silicon nitride powder is specially molded and then sintered to obtain silicon nitride ceramic parts with different shapes and functions. At present, the preparation of alpha-phase silicon nitride powder generally adopts a silicon powder nitriding method, the basic principle is that silicon powder and nitrogen react at high temperature to generate silicon nitride, and the operation flow mainly comprises the following steps: and filling silicon powder into the saggars, sequentially feeding a plurality of saggars into a sintering furnace, introducing nitrogen-containing reaction gas into the sintering furnace, gradually heating to about 1300 ℃, preserving heat for a certain time to perform nitridation reaction, then cooling to below 50 ℃, taking out the saggars, taking out generated silicon nitride plates from the saggars, and crushing to obtain the silicon nitride powder. In actual production, in order to improve yield, production efficiency and reduce energy consumption, a hearth of a sintering furnace is usually very long, a plurality of sagger groups for containing silicon powder need to be placed in each furnace, feeding and discharging of each sagger group are very troublesome, the silicon powder needs to be added into saggers, then the saggers are stacked together to form the sagger group, then one sagger group is placed on a turnover trolley with an inserting plate, the sagger group is shoveled by the turnover trolley and is sent into a furnace core of the sintering furnace, the sagger group is unloaded, and then the next sagger group is conveyed. And when the next sagger group is conveyed, the previous sagger group cannot be seen in the furnace core, so that the sagger group is inclined due to collision easily, and the sintering process is influenced. When discharging after sintering, the sagger groups need to be taken out in opposite directions, and the operation efficiency is low. Meanwhile, the prepared silicon nitride powder needs to have high alpha phase content, and further optimization design needs to be carried out on the structure of the sagger group.

Disclosure of Invention

Aiming at the problems in the prior art, the utility model provides a silicon powder feeding device, and aims to improve the operation efficiency of materials entering and exiting a sintering furnace and improve the product quality.

The technical scheme of the utility model is as follows: the utility model provides a silica flour feed arrangement, includes at least one transport car, transport the car and include the backup pad, be provided with the wheel below the backup pad, be provided with the reinforcing ring around the backup pad top, backup pad and reinforcing ring adopt integrated structure shaping, are provided with the connecting hole respectively at the both ends of transport car, and the connecting hole runs through reinforcing ring and backup pad in vertical direction, and even interval is provided with a plurality of rectangle spacing grooves and gas pocket in the backup pad that the reinforcing ring enclosed, the gas pocket runs through the backup pad in vertical direction.

Furthermore, a sagger group can be arranged on each limiting groove, each sagger group comprises a plurality of saggers which are overlapped in the vertical direction, and a cover plate is covered on the sagger on the uppermost layer; each sagger comprises a rectangular bottom plate, a circle of grooves are symmetrically formed in the upper surface and the lower surface of the bottom plate, a rectangular fence is placed in the groove in the upper surface of the bottom plate, a plurality of rectangular windows are formed in the upper portion of the fence, and the distance from the lower edge of each rectangular window to the upper surface of the bottom plate is smaller than or equal to 30 mm.

Furthermore, the fence comprises four right-angle enclosing barriers, and every two adjacent right-angle enclosing barriers are movably connected through a plug-in.

Furthermore, silicon powder is loosely contained in the sagger, a plurality of air holes are also arranged in the silicon powder, and the diameter of each air hole is 4-10 mm.

Has the advantages that: according to the utility model, a plurality of transport vehicles are used for transporting the saggar groups, adjacent transport vehicles can be connected through the connecting holes, a plurality of saggar groups can be placed on each transport vehicle, each saggar group is overlapped by a plurality of saggars, and silicon powder is placed in each saggar; meanwhile, silicon powder raw materials are loosely contained in a space enclosed by the bottom plate and the fence in each sagger, a plurality of rectangular windows are arranged at the upper part of the fence, a plurality of air holes are also arranged in the silicon powder raw materials, the windows and the air holes ensure that reaction process gases are fully contacted with the silicon powder raw materials, the uniformity of the heated reaction of the materials is ensured, and the requirement of high alpha phase content in the produced products is ensured by matching with process requirements; the silicon nitride product that produces at last is a holistic plate, encloses the fender with four right angles design into the rail, and the right angle encloses fender, plug-in components and bottom plate and adopts detachable swing joint, has improved the efficiency that the packing of material and result removed, improves production efficiency.

Drawings

Fig. 1 is a schematic view of the usage state of the utility model.

Fig. 2 is a schematic structural diagram of the transport cart.

FIG. 3 is a schematic view of the loading state of the sagger.

Fig. 4 is an exploded view of fig. 3.

The labels in the figure are: 1 sagger group, 2 cover plates, 3 conveying vehicles, 4 connecting pieces, 10 saggers, 11 bottom plates, 12 fences, 13 silicon powder raw materials, 31 supporting plates, 32 wheels, 33 reinforcing rings, 111 grooves, 121 right-angle barriers, 122 inserts, 131 air holes, 311 air holes, 312 limiting grooves, 331 connecting holes and 1211 rectangular windows.

Detailed Description

The utility model will be described more fully with reference to the accompanying drawings.

A silicon powder feeding device, as shown in FIG. 1, comprises two conveying carts 3 detachably connected together by a connecting member 4. As shown in fig. 2, each transport vehicle 3 comprises a support plate 31, four wheels 32 are arranged below the support plate 31, a rectangular reinforcing ring 33 is arranged around the upper part of the support plate 31, the support plate 31 and the reinforcing ring 33 are formed by adopting an integrated structure, two ends of the transport vehicle are respectively provided with a connecting hole 331, the connecting holes penetrate through the reinforcing ring and the support plate in the vertical direction, a connecting piece 4 can be placed in the connecting hole 31, four rectangular limiting grooves 312 and multiple rows of air holes 311 are uniformly arranged on the support plate surrounded by the reinforcing ring at intervals, the air holes penetrate through the support plate in the vertical direction and are used for enabling the support plate to be communicated up and down, and the temperature uniformity and the air circulation are maintained. The whole conveying vehicle is made of high-temperature-resistant materials, preferably, the supporting plate, the reinforcing ring and the wheels are made of silicon nitride ceramic materials, so that the influence on the nitridation reaction of silicon powder can be reduced, and the bearing performance, the push-pull resistance performance and the rolling performance of the conveying vehicle can be guaranteed. Each limiting groove 312 can be provided with a sagger group 1, and the limiting grooves can prevent the sagger groups from shaking, so that the sagger groups can be fixed and limited. As shown in fig. 1, each of the groups 1 includes ten saggers 10 stacked in a vertical direction, and a cover plate 2 is further covered on the uppermost one of the saggers. In order to improve the strength of the supporting plate, two silicon nitride ceramic reinforcing plates can be arranged below the supporting plate, the reinforcing plates and the supporting plate are integrally sintered and formed, and the wheels are arranged below the reinforcing plates.

As shown in fig. 3-4, each sagger 10 comprises a rectangular bottom plate 11, a rectangular fence 12 is arranged on the periphery of the upper surface of the bottom plate 11, and a silicon powder raw material 13 is loosely contained in a space surrounded by the bottom plate 11 and the fence 12; grooves 111 are symmetrically formed in the peripheries of the upper surface and the lower surface of the bottom plate, and the fence 12 is movably embedded in the grooves 111 to prevent the fence from deviating; the sagger stacking device is characterized in that a groove (not shown in the figure) is also formed in the periphery of the lower surface of the bottom plate, the front side and the back side of the bottom plate are not required to be distinguished when the sagger stacking device is used, the loading amount of materials can be increased by sagger stacking, when the sagger stacking device is used, the upper portion of a fence of a lower sagger can be embedded into a lower groove of the bottom plate of an upper sagger, the whole sagger group is connected into an integral structure after being overlapped, the sagger group can be prevented from inclining in the transportation process, meanwhile, the structure of the cover plate can be completely the same as that of the bottom plate, the sagger group is convenient to assemble, and the production efficiency is improved.

The fence 12 comprises four right-angle enclosing barriers 121 and four plug-in units 122, and two adjacent enclosing barriers are movably connected by one plug-in unit. Enclose fender 121 at every right angle and be provided with a plurality of rectangle windows 1211, because reaction material silicon powder is the powder, the silicon nitride product that generates is a holistic plate, consequently encloses fender and four plug-in components to four right angles with the rail design, and the right angle is enclosed fender, connecting piece and bottom plate and is adopted and can dismantle swing joint, has improved the efficiency that fills of material and result remove. Meanwhile, in order to reduce the influence and pollution of the sagger group on the silicon powder nitriding reaction, the whole sagger group is made of silicon nitride ceramic pieces.

In order to ensure that the silicon powder and the nitrogen-containing gas are heated uniformly at high temperature and the reaction speed is controlled, the distance from the lower edge of the bottom surface of the rectangular window to the upper surface of the bottom plate is set to be less than or equal to 30mm, so that the thickness of the silicon powder raw material is controlled to be less than or equal to 30mm, meanwhile, a plurality of air holes 131 are also formed in the silicon powder raw material, and the diameter of each air hole is 4-10 mm. The arrangement of the window and the air holes ensures the full contact of the reaction process gas and the silicon powder raw material, plays roles in multiple aspects such as heat dissipation, gas flow promotion, contact area increase and the like, ensures that the system is more balanced in the reaction process, and ensures the requirement of high alpha phase content in the produced product by matching with process requirements.

When the silicon powder scraping device is used, the bottom plate is firstly flatly placed, the four right-angle barriers are placed in the upper groove of the bottom plate, the four plug-in units are inserted to enable the four right-angle barriers to form the enclosure, then silicon powder is filled, the upper surface of the silicon powder is scraped, the thickness of the silicon powder is controlled, and a plurality of air holes are formed in the silicon powder. And vertically stacking a plurality of saggers filled with silicon powder together, and covering a cover plate on the sagger on the uppermost layer to form a sagger group. And then the sagger groups are placed on a limiting groove of a conveying vehicle, four sagger groups are installed on each conveying vehicle, the adjacent conveying vehicles are connected by adopting a connecting piece, and then the conveying vehicles are conveyed into a furnace core of the sintering furnace along a track of the sintering furnace to carry out sintering reaction. The silicon powder raw material in each sagger is loosely contained, the upper part of the fence is provided with a plurality of rectangular windows for ventilation, the silicon powder raw material is also provided with a plurality of air holes, the windows and the air holes are arranged to ensure the full contact of reaction process gas and the silicon powder raw material, the uniformity of the heated reaction of materials is ensured, the high alpha phase content in the produced products is ensured by matching with process requirements, after sintering is completed, the conveying vehicle is pulled out from the sintering furnace along a track, the sagger group is taken down, the inserting connection and the right-angle enclosure are knocked down, the generated silicon nitride plate block can be taken down, and the silicon nitride plate block is crushed and ground to obtain the silicon nitride powder. By combining the optimization control of the technological parameters of the sintering furnace and the optimization design of the sagger group structure, the content of the alpha phase in the finally prepared silicon nitride powder can exceed more than 90 percent.

The above embodiments are merely illustrative of the technical solutions of the present invention and are not intended to limit the present invention, and those skilled in the art should understand that changes, modifications, additions and substitutions can be made within the spirit of the present invention and the scope of the claims of the present invention without departing from the spirit thereof.

Claims (4)

1. A silica powder feeding device is characterized in that: the transportation vehicle comprises at least one transportation vehicle, wherein the transportation vehicle comprises a supporting plate, wheels are arranged below the supporting plate, a reinforcing ring is arranged around the upper part of the supporting plate, the supporting plate and the reinforcing ring are formed by adopting an integrated structure, connecting holes are respectively arranged at two ends of the transportation vehicle, the connecting holes penetrate through the reinforcing ring and the supporting plate in the vertical direction, a plurality of rectangular limiting grooves and air holes are uniformly arranged on the supporting plate surrounded by the reinforcing ring at intervals, and the air holes penetrate through the supporting plate in the vertical direction.

2. The silicon powder feeding device according to claim 1, characterized in that: a sagger group can be arranged on each limiting groove, each sagger group comprises a plurality of saggers which are overlapped in the vertical direction, and a cover plate covers the sagger on the uppermost layer; each sagger comprises a rectangular bottom plate, a circle of grooves are symmetrically formed in the upper surface and the lower surface of the bottom plate, a rectangular fence is placed in the groove in the upper surface of the bottom plate, a plurality of rectangular windows are formed in the upper portion of the fence, and the distance from the lower edge of each rectangular window to the upper surface of the bottom plate is smaller than or equal to 30 mm.

3. The silicon powder feeding device according to claim 2, characterized in that: the fence comprises four right-angle enclosing barriers, and every two adjacent right-angle enclosing barriers are movably connected through a plug-in.

4. The silicon powder feeding device according to claim 1, characterized in that: silicon powder is loosely contained in the sagger, a plurality of air holes are also arranged in the silicon powder, and the diameter of each air hole is 4-10 mm.

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