CN109458830B

CN109458830B - Pretreatment equipment for silicon waste recovery process

Info

Publication number: CN109458830B
Application number: CN201811343216.2A
Authority: CN
Inventors: 庹开正; 周旭
Original assignee: Chengdu Silicon Technology Co ltd
Current assignee: Chengdu Silicon Technology Co ltd
Priority date: 2018-11-13
Filing date: 2018-11-13
Publication date: 2020-06-30
Anticipated expiration: 2038-11-13
Also published as: CN109458830A

Abstract

The invention discloses pretreatment equipment for a silicon waste recovery process, which comprises a track, wherein a plurality of rollers are arranged in the track, a slag collector is arranged on the outer wall of the track, a slag discharge port is formed in the side wall of the track and is communicated with the inside of the track and a slag collection cavity, a support rod is arranged on the bottom surface of the inside of the track, a first spring is arranged on the support rod, the upper end of the first spring is connected with a rigid slag discharge plate positioned below the rollers, flexible slag discharge plates are bonded on two sides of the rigid slag discharge plate, and the flexible slag discharge plates penetrate through the corresponding slag discharge ports and extend into the slag collection cavity. According to the invention, after the silicon slag falls into the rail, the silicon slag can automatically move into the slag collector under the action of gravity to be collected, and the slag collector can be detached from the side wall of the rail, so that workers can conveniently collect part of silicon slag generated in the screening and drying processes, meanwhile, the silicon slag can not be accumulated in the rail, and the hidden danger that the roller is abraded or cannot normally rotate is fundamentally eliminated.

Description

Pretreatment equipment for silicon waste recovery process

Technical Field

The invention relates to the field of pretreatment of silicon slag recovery, in particular to pretreatment equipment of a silicon waste recovery process.

Background

After ingot casting, ingot breaking, slicing and other procedures, the polycrystalline silicon is manufactured into a silicon wafer to be processed, and trace boron, phosphorus and the like are doped and diffused on the silicon wafer to form a P-N junction. And then, adopting screen printing, printing the finely-prepared silver paste on a silicon chip to form a grid line, sintering to form a back electrode, coating an anti-reflection coating on the surface with the grid line, and thus obtaining the battery piece.

In the process of the cutting process of the silicon wafer, more silicon slag can be generated, and the recovery of the silicon cutting slag can obviously reduce the production cost. Before the recovery process of the silicon cutting slag, pretreatment processes such as drying and screening of the silicon slag are required. In order to integrate the drying and screening processes of the silicon slag, thereby shortening the total working hours and improving the drying efficiency, the inventor designs a drying device for naturally drying the silicon slag.

This airing device can have corresponding ground, dry, sieve silicon waste material high-efficiently under the environment that illumination time is long, illumination intensity is high, but, under the environment that illumination time is short, illumination intensity is weak, the airing time of silicon waste material will increase, and drying efficiency is low. In order to solve the problem, an auxiliary drying device based on rail movement is arranged in a drying cavity inside the airing device so as to provide auxiliary heat to shorten the drying time to a certain extent after the airing device finishes screening.

However, in the discovery of application process, supplementary drying equipment's track is owing to offer the removal smoothness nature of the opening that is used for setting up the gyro wheel in order to improve the removal frame on the track on it, and the silica fume has the silica fume in drying process, even the silicon waste material that the size is bigger slightly falls into the track in, this part silica fume is difficult not only to be collected, if inside more silica fume of piling up of track moreover, still will cause the inside difficult clearance of track to and the gyro wheel can't normally rotate, has lost the effect of being convenient for remove the frame and remove.

Disclosure of Invention

The invention aims to provide pretreatment equipment for a silicon waste recovery process, which aims to solve the problems that silicon slag is difficult to collect and clean and rollers are worn and cannot normally rotate due to the fact that the silicon slag is easy to accumulate in the conventional track.

The invention is realized by the following technical scheme:

the pretreatment equipment for the silicon waste recovery process comprises a track, wherein the track is of a hollow structure with an upward opening, a plurality of rollers are arranged in the track, two ends of the rotating shaft of the roller are movably inserted into the inner wall of the track, the distance between two adjacent rollers is equal to the diameter of the roller, the outer wall of the track is provided with a slag collector, the slag collector and the outer wall of the track form a closed slag collecting cavity, the side wall of the track is provided with a slag discharge port, the slag discharge port is communicated with the inside of the track and the slag collecting cavity, a supporting rod is arranged on the bottom surface of the inside of the track, the supporting rod is provided with a first spring, the upper end of the first spring is connected with a rigid slag discharging plate positioned below the roller, the height of the rigid slag discharging plate is gradually reduced along the direction from the center of the track to the inner wall of the track, and flexible slag discharge plates are bonded on two sides of the rigid slag discharge plate, penetrate through the corresponding slag discharge ports and extend into the slag collecting cavity.

At present, in order to provide the auxiliary heating under the condition that illumination intensity is weak, illumination time is short, be provided with the auxiliary heating frock in airing device's stoving chamber, this frock can be based on the track free movement in the stoving chamber, therefore the staff can be according to the condition of reality, for example local silicon waste material piles up to lead to airing the effect poor, carries out targeted stoving, and then improves drying efficiency, shortens total stoving time.

In the process of continuously improving the auxiliary heating tool, the inside of the rail is set to be of a hollow structure with an upward opening, and the moving frame and the blowing device installed on the moving frame are not large in mass, so that even if the rail is set to be of the hollow structure, the rail still has enough rigidity to support the moving frame and the blowing device. Be provided with a plurality of gyro wheels in the track inner space, preferably, the gyro wheel is equidistant setting, and the interval between two adjacent gyro wheels is roughly the same with the diameter of gyro wheel self, and the activity of the both ends of the pivot of gyro wheel is inserted in orbital inner wall so that the gyro wheel can rotate on the track. When the moving rack runs, the two through grooves formed in the bottom of the moving rack are respectively connected with the two rails in a clamped mode, the lower surfaces of the through grooves are higher than the upper surfaces of the rails, the upper surfaces of the through grooves are in contact with the rollers, sliding friction between the upper surfaces of the through grooves and the upper surfaces of the rails is changed into rolling friction, the contact area is reduced, the moving performance of the moving rack is greatly improved, and even if the through grooves or the parts of the rails are corroded by high-temperature acid gas, the moving rack also has good moving performance.

However, above-mentioned structure still has certain problem in practical application, because orbital opening upwards, and there is certain clearance between the gyro wheel, consequently screening, dry the produced partial silicon waste of in-process, especially the very little silica fume of size can scurry in the drying box in disorder under the influence of the mobile air that blast apparatus produced, final partial silica fume, even the silica fume that the size is a bit bigger can get into inside the track through the opening at track top, this partial silica fume that falls into in the track not only makes orbital clearance degree of difficulty big, also can't collect this partial silica fume simultaneously, pile up after certain degree in the track when the silica fume, can cause the gyro wheel wearing and tearing or unable normal rotation even. When the silicon waste is more, the phenomenon is particularly obvious, and after the auxiliary heating tool works for 2-3 hours, silicon slag about 1 cm can be accumulated in the track, and meanwhile, the auxiliary heating tool is accompanied by silicon waste with a certain size being slightly larger than the silicon slag.

In order to solve the above problems, the present invention improves the track. Firstly, slag collectors are arranged on two sides of a track, openings are formed in the left side or the right side of each slag collector, and the slag collectors and the side walls of the track jointly form a closed slag collecting cavity for collecting silicon slag discharged from the track. Preferably, the slag collector is detachably connected with the rail in a threaded connection mode or a clamping connection mode. The side wall of the track is provided with a slag discharge hole, the slag discharge hole is communicated with the inside of the track and the slag collecting cavity, a rigid slag discharge plate located below the roller is arranged inside the track, the height of the rigid slag discharge plate is gradually reduced along the direction from the center of the track to the inner wall of the track, so that silicon slag and silicon waste falling on the rigid slag discharge plate can move towards the slag discharge hole along the rigid slag discharge plate, and preferably, the thickness of the rigid slag discharge plate is 0.5-1.5 cm.

In this application, rigidity scum board bottom is connected with first spring, and first spring lower extreme is installed on the bracing piece, and the bracing piece is fixed on the inside bottom surface of track. The rigid connection mode of the rigid deslagging plate is improved into elastic connection from rigid connection, and the rigid deslagging plate is mainly used for realizing the following functions: firstly, when silicon waste with larger size and mass falls on the rigid slag discharging plate, the rigid slag discharging plate is impacted to move downwards or generate deviation, so that the angle between the rigid slag discharging plate and the horizontal plane is increased, on one hand, the increase of the opening area of a slag discharging opening is beneficial to the silicon waste to pass through the slag discharging opening, thereby avoiding the silicon waste with larger size from being clamped in the slag discharging opening, and on the other hand, the increase of the inclination angle is beneficial to the silicon waste and the adhered silicon slag to enter a slag discharging cavity; secondly, when the slag discharging plate receives larger impact of the silicon slag, the first spring contracts to discharge the impact force on part of the rigid slag discharging plate, so that the impact and abrasion on the surface of the first spring are effectively reduced; finally, part of hot flowing air generated by the air blowing device arranged on the moving frame can enter the track, the rigid deslagging plate can be driven by the hot flowing air and large-size silicon slag to shake to a certain extent, the silicon slag adhered to the rigid deslagging plate can be favorably separated from the rigid deslagging plate, therefore, the rigid deslagging plate does not need to be cleaned frequently, and the maintenance period of the rigid deslagging plate by workers can be further prolonged.

The two sides of the rigid slag discharging plate are both connected with flexible slag discharging plates, the rigid slag discharging plates and the flexible slag discharging plates can be spliced, clamped or bonded, and the flexible slag discharging plates penetrate through slag discharging openings corresponding to the sides and extend into the slag collecting cavity. Set up the aim at of flexible scum board, the flexible scum board that most are arranged in scum mouth and collection sediment chamber can be well with silicon sediment, the silicon waste material guide to arrange the sediment chamber on the rigid scum board, but flexible scum board can produce certain deformation after the atress simultaneously for the area of passing through of scum mouth can produce the change according to the size of actual silicon waste material, is favorable to the size almost to pass through with the silicon waste material of scum mouth size unanimity through the scum mouth. In addition, the part of the deslagging plate, which is positioned in the track, is set into a rigid deslagging plate, and the region, which is positioned near the deslagging port, is set into a flexible deslagging plate, so that the deslagging plate is also favorable for mounting and dismounting.

Through above-mentioned mechanism, can collect in the automatic movement to collection sediment ware under the effect of gravity after the dregs of a decoction fall into the track, and collection sediment ware can be followed orbital lateral wall and dismantled, makes things convenient for the staff to collect screening, dries the partial dregs of a decoction that the in-process produced, and simultaneously, the dregs of a decoction can not pile up in the track, has eliminated the hidden danger that the gyro wheel was worn and torn or unable normal pivoted from the root. In addition, the device reasonably utilizes the flowing air generated by the blowing device, and partial flowing air can enter the inside of the track from the opening at the top of the track and scour the surface of the slag discharging plate, so that the silicon slag adhered to the surface of the slag discharging plate enters the slag discharging device, and the collection efficiency of the silicon slag is improved.

As the preferable structure of the rigid deslagging plate, the rigid deslagging plate is formed by welding two flat plates, and the included angle between the two flat plates is 100-120 degrees. The structure is convenient for the silicon slag to move into the slag collecting cavity through the slag discharging port.

Further, a second spring is further arranged below the rigid slag discharging plate and fixed on the bottom surface inside the track, and the second spring is not in contact with the rigid slag discharging plate. After the second spring is arranged, when the second spring is subjected to larger impulsive force, the elasticity of the first spring is insufficient to unload the downward impulsive force of the rigid deslagging plate, the rigid deslagging plate moves downwards to be in contact with the upper end of the second spring, the second spring is compressed and is matched with the first spring to provide larger elastic force, so that the first spring and the rigid deslagging plate are well protected, and the structural stability of the device is improved.

Further, the second spring is located below one of the flat plates. The second spring is not located under the rigidity slag discharging plate, but is eccentrically arranged, so that when the rigidity slag discharging plate is contacted with the second spring downwards, the reaction force of the second spring is not vertical upwards, the rigidity slag discharging plate is inclined in the descending process, the inclination angle of a flat plate is improved, and silicon waste and silicon slag are discharged from a slag discharging port more favorably. Therefore, through the arrangement, the first spring and the rigid slag discharge plate are prevented from being damaged and abraded in collision, and meanwhile, the purpose of being more beneficial to discharging silicon waste and silicon slag is achieved by utilizing the eccentric arrangement.

Further, the diameter of the second spring is larger than that of the first spring. The second spring mainly plays the protection supporting role, and first spring mainly plays the elastic action, and consequently, the size of first spring is littleer, needs produce bigger deformation when the atress, and second spring size is bigger, needs deformation less when the atress to reach and support the rigid support board, protect the effect of first spring.

Furthermore, the rigid deslagging plate is made of metal, and the flexible deslagging plate is made of silicon rubber. The rigid deslagging plate can be made of various metals such as aluminum alloy, iron, copper and the like, the flexible deslagging plate is made of silicon rubber, and in order to reduce the viscosity of the surface of the silicon rubber, a layer of paint can be coated on the surface of the silicon rubber so as to reduce the adhesion of silicon slag with small size on the flexible deslagging plate.

Furthermore, a clamping groove is formed in the side face, in contact with the slag collector, of the track, a clamping protrusion is arranged on the slag collector, and the clamping protrusion is matched with the clamping groove. During the installation, with the open end orientation row cinder notch of collection sediment ware, later with protruding alignment draw-in groove of card and block in the draw-in groove so that collection sediment ware and track relatively fixed.

Furthermore, a magnet is arranged on the clamping protrusion. The magnet is more favorable to the protruding and draw-in groove of card to it to improve the combination degree between them, thereby promote the stability of structure.

Furthermore, a plurality of through holes are formed in the top of the slag collector. Because the slag collector is a closed space, when the air drives the silicon slag to impact the slag collecting cavity from the inside of the track, the air easily generates local backflow in the slag collecting cavity and brings the silicon slag in the slag collecting cavity to the slag discharging plate. In order to solve the problem, a plurality of through holes are formed in the top of the slag collector, on one hand, the through holes can allow air to pass through and prevent the air from flowing back in the slag collecting cavity, and on the other hand, silicon slag is not easy to discharge from the through holes due to factors such as self gravity, size and the like.

Further, the diameter of the through hole is gradually increased from the slag collecting cavity to the outside of the slag collector. The through holes with variable diameters ensure that the silicon slag collected in the slag collecting cavity is not easily taken out of the slag collecting cavity by hot flowing air.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. according to the invention, after the silicon slag falls into the rail, the silicon slag can automatically move to the slag collector under the action of gravity for collection, and the slag collector can be detached from the side wall of the rail, so that workers can conveniently collect part of silicon slag generated in the screening and drying processes, meanwhile, the silicon slag can not be accumulated in the rail, and the hidden danger that the roller is worn or cannot normally rotate is fundamentally eliminated;

2. the invention designs the connection mode between the rigid deslagging plate and the support rod as elastic connection, and is mainly used for realizing the following functions: firstly, when silicon waste with larger size and mass falls on the rigid slag discharging plate, the rigid slag discharging plate is impacted to move downwards or generate deviation, so that the angle between the rigid slag discharging plate and the horizontal plane is increased, on one hand, the increase of the opening area of a slag discharging opening is beneficial to the silicon waste to pass through the slag discharging opening, thereby avoiding the silicon waste with larger size from being clamped in the slag discharging opening, and on the other hand, the increase of the inclination angle is beneficial to the silicon waste and the adhered silicon slag to enter a slag discharging cavity; secondly, when the slag discharging plate receives larger impact of the silicon slag, the first spring contracts to discharge the impact force on part of the rigid slag discharging plate, so that the impact and abrasion on the surface of the first spring are effectively reduced; finally, part of hot flowing air generated by the air blowing device arranged on the moving frame can enter the track, and both the hot flowing air and the large-size silicon slag can drive the rigid deslagging plate to generate certain shaking, so that the silicon slag adhered to the rigid deslagging plate can be favorably separated from the rigid deslagging plate, the rigid deslagging plate does not need to be cleaned frequently, and the maintenance period of a worker on the rigid deslagging plate can be further prolonged;

3. the second spring is eccentrically arranged, so that the first spring and the rigid slag discharge plate are prevented from being damaged and abraded in collision, and silicon waste and silicon slag are discharged conveniently;

4. according to the invention, the through hole with the variable aperture is formed in the top of the slag collector, so that the silicon slag collected in the slag collecting cavity is not easily carried out of the slag collecting cavity by hot flowing air.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a top view of an embodiment of the present invention;

fig. 3 is a schematic diagram of a mobile frame mounted on a track according to an embodiment of the present invention.

Reference numbers and corresponding part names in the drawings:

1-rail, 2-slag discharge port, 3-roller, 4-rotating shaft, 5-slag collector, 6-through hole, 7-clamping protrusion, 8-support rod, 9-rigid slag discharge plate, 10-flexible slag discharge plate, 11-moving frame, 12-blowing device, 13-first spring and 14-second spring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the scope of the present invention.

Example (b):

the pretreatment equipment for the silicon waste recovery process shown in fig. 1 and 2 comprises a track 1, wherein the track 1 is of a hollow structure with an upward opening, a plurality of rollers 3 are arranged in the track 1, two ends of a rotating shaft 4 of each roller 3 are movably inserted into the inner wall of the track 1, the distance between every two adjacent rollers 3 is equal to the diameter of each roller 3, a slag collector 5 is arranged on the outer wall of the track 1, the slag collector 5 and the outer wall of the track 1 form a closed slag collecting cavity, a slag discharge port 2 is formed in the side wall of the track 1, the slag discharge port 2 is communicated with the inside of the track 1 and the slag collecting cavity, a support rod 8 is arranged on the bottom surface of the inside of the track 1, a first spring 13 is arranged on the support rod 8, the upper end of the first spring 13 is connected with a rigid slag discharge plate 9 positioned below the rollers 3, and the height of the rigid slag discharge plate 9 is gradually reduced along the direction from, flexible slag discharge plates 10 are bonded on two sides of the rigid slag discharge plate 9, and the flexible slag discharge plates 10 penetrate through the corresponding slag discharge ports 2 and extend into the slag collecting cavity; the rigid deslagging plate 9 is formed by welding two flat plates, and the included angle between the two flat plates is 100-120 degrees; a second spring 14 is further arranged below the rigid deslagging plate 9, the second spring 14 is fixed on the bottom surface inside the track 1, and the second spring 14 is not in contact with the rigid deslagging plate 9; the second spring 14 is positioned below a flat plate; the diameter of the second spring 14 is larger than that of the first spring 13; the rigid deslagging plate 9 is made of metal, and the flexible deslagging plate 10 is made of silicon rubber; a clamping groove is formed in the side face, in contact with the slag collector 5, of the rail 1, a clamping protrusion 7 is arranged on the slag collector 5, and the clamping protrusion 7 is matched with the clamping groove; the clamping bulge 7 is provided with a magnet; the top of the slag collector 5 is provided with a plurality of through holes 6; the diameter of the through hole 6 gradually increases from the slag collecting cavity to the outside of the slag collector 5.

As shown in fig. 3, during operation, the movable frame 11 moves on the track 1, and then drives the blowing device 12 to move, the hot flowing air generated by the blowing device 12 heats the drying chamber of the drying device, and brings part of the silicon waste generated in the screening and drying processes to the rigid slag discharging plate 9 in the track 1, and brings the silicon waste into the slag collector 5 through the slag discharging port 2 along the rigid slag discharging plate 9 and the flexible slag discharging plate 10, and then the air flows out of the slag collector 5 through the through hole 6, and the silicon waste is collected in the slag collector 5. After working for a period of time, the slag collector 5 is taken down, the silicon slag in the slag collector 5 is collected, and the silicon slag in the slag collector 5 is continuously heated and dried by flowing air, so that the silicon slag can be directly put into the dried silicon slag, and the drying efficiency is improved. Meanwhile, workers do not need to clean the track 1, and the condition that the roller 3 is abraded or cannot normally rotate is avoided fundamentally.

The use of "first", "second", etc. (e.g., first spring, second spring, etc.) in the present invention is for clarity of description to distinguish between corresponding parts and is not intended to limit any order or to emphasize importance, etc. Further, the term "connected" used herein may be either directly connected or indirectly connected via other components without being particularly described.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. Pretreatment equipment for silicon waste recovery process, which comprises a track (1), wherein the track (1) is of a hollow structure with an upward opening, a plurality of rollers (3) are arranged in the track (1), two ends of a rotating shaft (4) of each roller (3) are movably inserted into the inner wall of the track (1), the distance between every two adjacent rollers (3) is equal to the diameter of each roller (3), the pretreatment equipment is characterized in that a slag collector (5) is arranged on the outer wall of the track (1), the slag collector (5) and the outer wall of the track (1) form a closed slag collecting cavity, a slag discharge port (2) is formed in the side wall of the track (1), the slag discharge port (2) is communicated with the inside of the track (1) and the slag collecting cavity, a supporting rod (8) is arranged on the bottom surface of the inside of the track (1), a first spring (13) is arranged on the supporting rod (8), a rigid slag discharge plate (9) positioned below the rollers (3) is connected to the upper end of the, along track (1) center to track (1) inner wall direction, the height of rigidity scum board (9) reduces gradually, the both sides of rigidity scum board (9) bond there is flexible scum board (10), flexible scum board (10) pass corresponding row cinder notch (2) and extend to in the collection sediment chamber.

2. The pretreatment equipment of the silicon waste recovery process according to claim 1, wherein the rigid deslagging plate (9) is formed by welding two flat plates, and the included angle between the two flat plates is 100-120 degrees.

3. The pretreatment apparatus for silicon scrap recycling process according to claim 2, wherein a second spring (14) is further provided under the rigid slag discharge plate (9), the second spring (14) is fixed on the inner bottom surface of the rail (1), and the second spring (14) is not in contact with the rigid slag discharge plate (9).

4. The pretreatment apparatus for silicon scrap recycling process according to claim 3, wherein said second spring (14) is located under a flat plate.

5. The pretreatment apparatus for silicon scrap recycling process according to claim 3, wherein the diameter of the second spring (14) is larger than the diameter of the first spring (13).

6. The pretreatment apparatus for silicon waste recycling process according to claim 1, wherein the rigid deslagging plate (9) is made of metal and the flexible deslagging plate (10) is made of silicon rubber.

7. The pretreatment equipment of the silicon waste recycling process according to claim 1, wherein a clamping groove is arranged on the side surface of the track (1) contacting with the slag collector (5), a clamping protrusion (7) is arranged on the slag collector (5), and the clamping protrusion (7) is matched with the clamping groove.

8. The pretreatment apparatus for silicon scrap recycling process according to claim 7, wherein a magnet is provided on the card projection (7).

9. The pretreatment equipment for silicon scrap recycling process according to claim 1, wherein the top of the slag collector (5) is provided with a plurality of through holes (6).

10. The pretreatment apparatus for silicon scrap recycling process according to claim 9, wherein the diameter of the through-hole (6) is gradually increased from the slag trap chamber to the outside of the slag trap (5).