An integrated device for automatic feeding and screening of granular silicon

Abstract

The present invention discloses an integrated automatic feeding and screening device for granular silicon, belonging to the technical field of screening equipment, the integrated automatic feeding and screening device for granular silicon comprises a bottom cover, a screening bin, a feeding pipe, a feeding mechanism, an upper pressing plate, a supporting shaft, a screening plate, a small sieve hole area, and a large sieve hole area, wherein the screening plate is located below the upper pressing plate, and a plurality of arcuate convex strips are fixedly connected to the upper end surface of the screening plate, and the arcuate convex strips are arranged radially on the end surface of the screening plate, and a discharging mechanism is provided in the screening bin. In the present invention, when the screening plate rotates, the upper pressing plate generates friction with the larger particles of granular silicon, and driven by the friction force, the larger particles of granular silicon will be driven to the large sieve hole area along the surface of the arcuate convex strips, so that the large particles of granular silicon and the small particles of granular silicon can be separated, and screened by the large sieve hole area and the small sieve hole area respectively.

Description

Technical Field

[0001] The present invention belongs to the technical field of screening equipment, and in particular relates to an integrated automatic feeding and screening device for granular silicon. Background Art

[0002] Silica gel, also known as silica gel, is a granular porous silicon dioxide hydrate, an amorphous substance with a transparent or milky white appearance. It is made by washing and drying sodium silicate with acid. It has stable chemical properties and is non-flammable. Silica gel is a highly active adsorption material, mainly used as a desiccant and adsorbent in column chromatography and thin layer chromatography. Generally speaking, it can be divided into two categories: organic silica gel and inorganic silica gel.

[0003] In the production process of silica gel, the spherical silicon particles in the raw materials need to be screened to meet the processing requirements. During screening, screening equipment is usually used for operation. For example, a screening device for spherical particles in silica gel particles disclosed in Chinese utility model patent publication number CN216539513U includes a base, a vibration motor is fixedly installed in the middle of the upper end surface of the base, and a screening frame is fixedly installed at the output end of the vibration motor. When screening, the vibration motor drives the screening frame to vibrate, and at the same time, the first motor drives the rotating shaft to rotate, prompting the rotating shaft to drive the two pusher plates to rotate, and the silica gel particles screened by the small screen are pushed to the medium screen for screening, and then the two pusher plates continue to move to push the screened silica gel particles to the large screen for screening, so that the small screen, the medium screen and the large screen can simultaneously screen out large, small and medium-sized particles in the silica gel particles.

[0004] The granular silicon screening equipment in the above-mentioned prior art mainly achieves screening of the granular silicon by setting up three sieves with different mesh sizes and putting the granular silicon into the screening equipment. Silicon particles of different particle sizes pass through the sieves with different mesh sizes in turn. However, this method has a disadvantage, that is, the granular silicon is easily accumulated on the sieve, making it difficult for the granular silicon in the upper layer to quickly pass through the sieve holes on the sieve to achieve the screening purpose. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned prior art and provide an integrated device for automatic feeding and screening of granular silicon.

[0006] The technical solution adopted to solve the above technical problems is:

[0007] An integrated device for automatic feeding and screening of granular silicon, comprising:

[0008] A screening bin with an open bottom and connected to a bottom cover, wherein a feeding pipe is provided on the top of the screening bin, and the lower end of the feeding pipe extends into the interior of the screening bin;

[0009] A feeding mechanism is arranged above the screening bin, and the feeding mechanism is connected with the screening bin;

[0010] An upper pressing plate fixedly sleeved on the lower end of the feeding pipe, wherein the periphery of the upper pressing plate is engaged with the inner cavity of the screening bin;

[0011] A support shaft is coaxially penetrated through the end face of the bottom cover, and the support shaft slides vertically and freely on the end face of the bottom cover. The upper end of the support shaft extends into the screening bin and is coaxially fixed with a screening plate. The screening plate is engaged with the inner cavity wall of the screening bin and slides vertically and freely. The end face of the screening plate is provided with small sieve hole areas and large sieve hole areas in sequence in the direction away from its axis. The screening plate is located below the upper pressure plate, and a plurality of arc-shaped convex strips are fixed to the upper face of the screening plate, and the arc-shaped convex strips are radially arranged on the end face of the screening plate. A discharging mechanism is provided in the screening bin.

[0012] Through the above technical scheme, the granular silicon raw material to be screened is transported to the feeding pipe by the feeding mechanism and enters the area between the sieve plate and the upper pressure plate. The sieve plate is rotated so that the granular silicon raw material can be evenly spread in the area surrounded by two adjacent arc-shaped convex strips. Small particles of granular silicon will fall through the sieve holes in the small sieve hole area. When the sieve plate rotates, it will rub against larger particles of granular silicon. Driven by the friction force, larger particles of granular silicon will be driven along the surface of the arc-shaped convex strips to the large sieve hole area, thereby achieving the separation of large particles of granular silicon and small particles of granular silicon, and they will be screened by the large sieve hole area and the small sieve hole area respectively.

[0013] Furthermore, the feeding mechanism includes a feeding bin connected to the upper end of the feeding pipe, the top of the feeding bin is open and connected to a filter bin, the lower end surface of the filter bin is closed and vertically penetrated by a plurality of filter elements, the lower end of the filter element extends to the inner cavity of the feeding bin, a vacuum pump is installed on the top of the filter bin, the air inlet end of the vacuum pump is communicated with the upper end of the filter bin, a suction pipe is installed on the outer wall of the feeding bin, and the suction pipe is communicated with the interior of the feeding bin.

[0014] Through the above technical scheme, the vacuum pump is started and the air in the filter bin is evacuated. Then, the granular silicon raw material to be screened can be sucked into the loading bin through the suction pipe through the filter element, the loading bin and the suction pipe. After being sucked into the loading bin, the density of the granular silicon is much greater than the density of the air, so the granular silicon will fall into the feeding pipe, and the air will pass through the filter element into the vacuum pump, thereby realizing the feeding operation of the granular silicon by the vacuum pump.

[0015] Furthermore, a mounting seat is connected to the bottom of the bottom cover, a motor is installed at the lower end of the mounting seat, and an output shaft of the motor is drivingly connected to an end of the support shaft passing through the bottom cover.

[0016] Through the above technical solution, the motor starts and drives the support shaft to rotate, thereby driving the screening plate to rotate.

[0017] Furthermore, a spline hole is provided at the lower end of the support shaft, the output shaft of the motor passes through the spline hole and is key-connected to the spline hole, and a floating mechanism is provided at the bottom of the bottom cover, and the floating mechanism is used to drive the support shaft to reciprocate vertically when the output shaft of the motor rotates.

[0018] Through the above technical scheme, when the motor drives the support shaft to rotate, the floating mechanism drives the support shaft to produce reciprocating motion in the vertical direction, so that the screen plate can reciprocate vertically, and when the screen plate moves downward, the granular silicon raw material in the feeding pipe will quickly enter between the screen plate and the upper pressure plate, and when the screen plate moves upward, the gap between the screen plate and the upper pressure plate becomes smaller, thereby preventing the granular silicon raw material in the feeding pipe from continuing to enter, thereby realizing a small amount of continuous screening of the granular silicon raw material, and avoiding the phenomenon that the upper layer of granular silicon cannot quickly pass through the screen plate due to the accumulation of granular silicon raw material on the surface of the screen plate.

[0019] Furthermore, the floating mechanism includes a fixed ring fixedly connected to the bottom surface of the bottom cover, a floating ring is fixedly sleeved on the lower end of the support shaft, the floating ring is located below the fixed ring, and the upper end surface of the floating ring is vertically fixed with two fixing pins, the lower end surface of the fixed ring is fixed with two arc-shaped protrusions, one end of the arc-shaped protrusion is smoothly transitioned to the lower end surface of the fixed ring, and an elastic member is provided in the mounting seat, the elastic member is used to generate an upward elastic resisting force on the floating ring, so that when the support shaft rotates, the top of the fixed ring is driven to alternately contact the lower end surface of the fixed ring and the surface of the arc-shaped protrusion.

[0020] Through the above technical solution, when the motor drives the support shaft to rotate, the support shaft synchronously drives the floating ring to rotate. The upward elastic resisting force generated by the elastic member on the floating ring causes the end of the fixing pin to slide alternately on the lower end surface of the fixing ring and the downward side of the arc-shaped protrusion, thereby driving the support shaft to reciprocate in the vertical direction. The structure is simple.

[0021] Furthermore, the elastic member includes a return spring vertically mounted on the bottom wall of the inner cavity of the mounting seat, and two ends of the return spring in the elastic force direction elastically press against the bottom wall of the inner cavity of the mounting seat and the lower end surface of the floating ring respectively and correspondingly.

[0022] Through the above technical solution, when the floating ring moves downward, the return spring is compressed by the floating ring and accumulates elastic potential energy. When the floating ring continues to rotate, the end of the fixing pin slides from the surface of the arc-shaped protrusion to the lower end surface of the fixing ring, and the elastic potential energy accumulated in the return spring is released, thereby driving the floating ring to move upward.

[0023] Furthermore, a ball is rotatably embedded at the top end of the fixing pin.

[0024] Through the above technical solution, the balls roll on the lower end surface of the fixing ring and the surface of the arc-shaped protrusion, replacing the sliding of the end of the fixing pin on the lower end surface of the fixing ring and the surface of the arc-shaped protrusion, converting the sliding friction into rolling friction, thereby reducing the friction resistance.

[0025] Furthermore, the top surface of the screen plate is concave, and the thickness of the screen plate increases gradually in the direction away from the small screen hole area, so that the longitudinal distance between the top surface of the screen plate and the bottom surface of the upper pressure plate decreases correspondingly, and the minimum value of the longitudinal distance is greater than the screen hole diameter value of the small screen hole area.

[0026] Through the above technical solution, the top surface of the screen plate is concave, so that when the screen plate approaches the upper pressure plate and rotates, the bottom surface of the upper pressure plate will contact with the larger particles of granular silicon and generate friction on the larger particles of granular silicon, so that the larger particles of granular silicon roll on the surface of the screen plate toward the large sieve hole area, and in this process, the bottom surface of the upper pressure plate will not exert force on the smaller particles of granular silicon, or will not cause the smaller particles of granular silicon to be driven to the large sieve hole area, thereby separating the large particles of granular silicon from the small particles of granular silicon.

[0027] Furthermore, a plug is coaxially fixed to the top of the screening plate, and a conical groove cooperating with the plug is formed at the lower end of the feeding pipe.

[0028] Through the above technical solution, when the screen plate moves upward, the plug on the top of the screen plate will be engaged in the conical groove, which can prevent the granular silicon raw material in the feeding pipe from continuing to enter between the screen plate and the upper pressure plate, thereby facilitating the continuous screening of the granular silicon raw material in small quantities.

[0029] Furthermore, the discharging mechanism includes an annular portion coaxially fixed to the bottom of the screening plate, a conical outer edge coaxially fixed to the lower end of the annular portion, a large particle storage space is enclosed between the conical outer edge, the annular portion and the side wall of the inner cavity of the screening bin, the large particle storage space is connected with the large sieve hole area, the periphery of the screening bin is provided with a large particle discharge port connected with the large particle storage space, the inner cavity wall of the screening bin is obliquely fixed with a baffle plate, the support shaft penetrates the baffle plate and slides vertically freely, the baffle plate is located below the conical outer edge, the periphery of the screening bin is provided with a small particle discharge port corresponding to the lower side of the baffle plate, and the small particle discharge port is connected with the interior of the screening bin.

[0030] Through the above technical scheme, larger particles of granular silicon falling from the large sieve hole area will fall into the large particle storage space and be stored, while small particles of granular silicon will pass through the sieve holes in the small sieve hole area and fall onto the baffle plate, and roll along the baffle plate to the small particle discharge port, thereby realizing the separate collection of large particles of granular silicon and small particles of granular silicon.

[0031] The beneficial effects of the present invention are as follows:

[0032] In the present invention, when the screening plate rotates, the upper pressing plate and the larger particles of granular silicon generate friction. Driven by the friction force, the larger particles of granular silicon are driven to the large sieve hole area along the surface of the arc-shaped convex strips, so that the large particles of granular silicon and the small particles of granular silicon can be separated and screened by the large sieve hole area and the small sieve hole area respectively.

[0033] The present invention sets the top surface of the sieve plate in a concave shape, so that when the sieve plate approaches the upper pressing plate and rotates, the bottom surface of the upper pressing plate will contact with the larger particles of granular silicon and generate friction force on the larger particles of granular silicon, so that the larger particles of granular silicon roll on the surface of the sieve plate toward the large sieve hole area, and in this process, the bottom surface of the upper pressing plate will not generate force on the smaller particles of granular silicon;

[0034] The present invention provides a discharging mechanism so that larger particles of granular silicon falling from the large sieve hole area will fall into the large particle storage space and be stored, while small particles of granular silicon will pass through the sieve holes in the small sieve hole area and fall onto the baffle plate, and roll along the baffle plate to the small particle discharging port, thereby achieving separate collection of large particles of granular silicon and small particles of granular silicon. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the overall structure of an integrated device for automatic feeding and screening of granular silicon in the present invention;

[0036] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure at a mid-frontal angle;

[0037] Figure 3 yes Figure 1 The schematic diagram of the structure after the feeding bin, filtering bin, vacuum pump and suction pipe are omitted;

[0038] Figure 4 yes Figure 3 A schematic cross-sectional view of the middle structure;

[0039] Figure 5 yes Figure 3 The schematic diagram of the structure from the upward angle after the screening bin is omitted;

[0040] Figure 6 yes Figure 5A schematic diagram of a cross-sectional structure from a front view angle;

[0041] Figure 7 It is a schematic diagram of the structure of the screening plate, the arc-shaped convex strips, the support shaft and the annular portion after being assembled in the present invention from a top view;

[0042] Figure 8 It is a schematic diagram of the structure of the screening plate, arc-shaped convex strips, support shaft and annular portion after being assembled in the present invention when viewed from a bottom up angle.

[0043] Figure numerals: 1. vacuum pump; 2. filter bin; 3. feeding bin; 4. suction pipe; 5. screening bin; 6. large particle discharge port; 7. small particle discharge port; 8. bottom cover; 9. mounting seat; 10. motor; 11. vibrator; 12. filter element; 13. protrusion; 14. large particle storage space; 15. conical outer edge; 16. screening plate; 17. upper pressure plate; 18. annular portion; 19. blanking gap; 20. baffle plate; 21. support shaft; 22. plug; 23. large sieve hole area; 24. small sieve hole area; 25. feeding pipe; 26. arc-shaped convex strip; 27. floating ring; 28. reset spring; 29. ​​arc-shaped convex block; 30. fixing pin; 31. fixing ring; 32. ball; 33. transition area. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0045] like Figure 1-Figure 8 As shown, the present embodiment provides an integrated automatic feeding and screening device for granular silicon, including a screening bin 5 with an open bottom and connected to a bottom cover 8. The bottom of the bottom cover 8 can be welded with a plurality of legs to stand upright on a placement surface. In addition, a feeding pipe 25 is provided on the top of the screening bin 5. The lower end of the feeding pipe 25 extends to the interior of the screening bin 5. The upper end of the feeding pipe 25 is connected to a feeding bin 3 by bolts. The top of the feeding bin 3 is open and connected to a filtering bin 2. The lower end surface of the filtering bin 2 is closed and vertically penetrated with a plurality of filter elements 12. The lower end of the filter element 12 extends to the inner cavity of the feeding bin 3. A vacuum pump 1 is installed on the top of the filtering bin 2. The vacuum pump 1 The air inlet end is connected with the upper end of the filter bin 2, and a suction pipe 4 is installed on the outer wall of the feeding bin 3. The suction pipe 4 is connected with the inside of the feeding bin 3, and the end of the suction pipe 4 away from the feeding bin 3 is installed in the device for storing granular silicon. In this way, when feeding, the vacuum pump 1 is started, and the vacuum pump 1 evacuates the filter bin 2, and then the granular silicon raw material to be screened can be sucked into the feeding bin 3 through the suction pipe 4 through the filter element 12, the feeding bin 3 and the suction pipe 4. After being sucked into the feeding bin 3, the density of the granular silicon is much greater than the density of air, so the granular silicon will fall into the feeding pipe 25, and the air will pass through the filter element 12 into the vacuum pump 1;

[0046] Combination Figures 1 to 8 As shown, the lower end of the feeding pipe 25 (i.e., the end extending into the screening bin 5) is coaxially fixedly sleeved with an upper pressure plate 17, and the peripheral edge of the upper pressure plate 17 is engaged with the inner cavity of the screening bin 5, so that the peripheral edge of the upper pressure plate 17 is sealed with the inner cavity wall of the screening bin 5, and a support shaft 21 is coaxially penetrated through the end face of the bottom cover 8, and the support shaft 21 slides vertically and freely on the end face of the bottom cover 8, and the upper end of the support shaft 21 extends into the screening bin 5 and is coaxially fixed with a screening plate 16, which is engaged with the inner cavity wall of the screening bin 5 and slides vertically and freely, and the end face of the screening plate 16 is sequentially provided with a small sieve hole area 24 and a large sieve hole area 23 in the direction away from its axis, and the screening plate 16 is located below the upper pressure plate 17, and a plurality of arc-shaped convex strips 26 are fixedly connected to the upper end face of the screening plate 16, and the top surface of the arc-shaped convex strips 26 slightly protrudes to the top surface of the screening plate 16, and Figure 4 or Figure 7 It can be seen that the arcuate ridges 26 are radially arranged on the end surface of the sieve plate 16, and an area is enclosed between each two adjacent arcuate ridges 26. In addition, a transition area 33 can be provided on the top surface of the sieve plate 16, and the transition area 33 is located between the small sieve hole area 24 and the large sieve hole area 23. The top surface of the sieve plate 16 is concave, and the thickness of the sieve plate 16 increases gradually in the direction away from the small sieve hole area 24, so that the longitudinal spacing between the top surface of the sieve plate 16 and the bottom surface of the upper pressing plate 17 decreases correspondingly, and the minimum value of the longitudinal spacing is greater than the sieve hole diameter value of the small sieve hole area 24. In this embodiment, the sieve hole diameter value of the large sieve hole area 23 and the sieve hole diameter value of the small sieve hole area 24 are set by those skilled in the art according to the specific particle size of the granular silicon. For example, the large sieve hole area 2 3 is set to 3mm, and the sieve aperture value of the small sieve area 24 is set to 1.8mm, and no specific restrictions are made here. A plug 22 is coaxially fixed to the top of the sieve plate 16, and a conical groove matching the plug 22 is opened at the lower end of the feeding pipe 25. When the sieve plate 16 moves upward, the plug 22 on the top of the sieve plate 16 will be engaged in the conical groove, which can prevent the granular silicon raw material in the feeding pipe 25 from continuing to enter between the sieve plate 16 and the upper pressing plate 17, thereby facilitating the screening of the granular silicon raw material in small quantities and continuously. In addition, a protrusion 13 integrally formed with the feeding pipe 25 is set at the lower end of the feeding pipe 25, and the protrusion 13 is tubular, and the upper pressing plate 17 is welded to the protrusion 13, which makes the processing of the feeding pipe 25 more convenient, and the assembly with the upper pressing plate 17 is more convenient;

[0047] Combination Figure 4 , Figure 5 and Figure 6As shown, a mounting seat 9 is connected to the bottom of the bottom cover 8, and a motor 10 is installed at the lower end of the mounting seat 9. The motor 10 is connected to an external control cabinet and a power supply through a cable. The power supply is used to supply power to the motor 10, and the control cabinet is used to control the speed and direction of the motor 10. A spline hole is opened at the lower end of the support shaft 21, and the output shaft of the motor 10 penetrates the spline hole and is key-connected with the spline hole. A fixing ring 31 is fixedly connected to the bottom surface of the bottom cover 8, and a floating ring 27 is fixedly sleeved on the lower end of the support shaft 21. The floating ring 27 is located below the fixing ring 31, and the upper end surface of the floating ring 27 is vertically fixedly connected with two fixing pins 30, and the lower end surface of the fixing ring 31 is fixedly connected with two arc-shaped protrusions 29, and one end of the arc-shaped protrusion 29 is smoothly transitioned with the lower end surface of the fixing ring 31. A reset spring 28 is vertically installed on the bottom wall of the inner cavity of the mounting seat 9, and the two ends of the reset spring 28 in the elastic force direction elastically press against the bottom wall of the inner cavity of the mounting seat 9 and the lower end surface of the floating ring 27 respectively, to reset The spring 28 is used to generate an upward elastic resisting force on the floating ring 27, so that when the support shaft 21 rotates, the top of the driving fixed ring 31 alternately contacts the lower end surface of the fixing ring 31 and the surface of the arc-shaped protrusion 29. When the motor 10 drives the support shaft 21 to rotate, the support shaft 21 synchronously drives the floating ring 27 to rotate. The upward elastic resisting force generated by the return spring 28 on the floating ring 27 causes the end of the fixing pin 30 to slide alternately on the lower end surface of the fixing ring 31 and the downward side of the arc-shaped protrusion 29, thereby being able to drive the support shaft 21 to reciprocate in the vertical direction. In addition, further, a ball 32 is rotatably embedded at the top of the fixing pin 30. The ball 32 rolls on the lower end surface of the fixing ring 31 and the surface of the arc-shaped protrusion 29, replacing the sliding of the end of the fixing pin 30 on the lower end surface of the fixing ring 31 and the surface of the arc-shaped protrusion 29, converting the sliding friction into rolling friction, thereby reducing the friction resistance.

[0048] Combination Figure 2 , Figure 4 , Figure 7 and Figure 8As shown, the bottom of the screening plate 16 is coaxially fixedly connected with an annular portion 18, and the lower end of the annular portion 18 is coaxially fixedly connected with a conical outer edge 15, and a large particle storage space 14 is surrounded by the conical outer edge 15, the annular portion 18 and the side wall of the inner cavity of the screening bin 5. The large particle storage space 14 is connected with the large sieve hole area 23, and the periphery of the screening bin 5 is provided with a large particle discharge port 6 connected with the large particle storage space 14. The inner cavity wall of the screening bin 5 is obliquely fixedly connected with a baffle plate 20, and the support shaft 21 penetrates the baffle plate 20 and slides vertically freely. The baffle plate 20 is located below the conical outer edge 15, and the periphery of the screening bin 5 is provided with a small particle discharge port 7 corresponding to the lower side of the baffle plate 20, and the small particle discharge port 7 is connected with the inside of the screening bin 5, and the mouths of the large particle discharge port 6 and the small particle discharge port 7 are A baffle cover (not shown in the figure) is installed. In addition, the outer diameter of the conical outer edge 15 is smaller than the inner diameter of the inner cavity of the screening bin 5, so that a drop gap 19 is formed between the periphery of the conical outer edge 15 and the inner cavity wall of the screening bin 5. The width value of the drop gap 19 is consistent with the particle size value of the standard granular silicon, so that even if a small amount of smaller particles of granular silicon fall from the large sieve hole area 23, they can still fall into the baffle plate 20 through the drop gap 19. In addition, a vibrator 11 is installed on the outer wall of the screening bin 5. When the vibrator 11 is started, it will vibrate the screening bin 5. The vibration force can act on the granular silicon stuck in the drop gap 19, so that the smaller particles of granular silicon can fall onto the baffle plate 20 more smoothly, avoiding affecting the discharge of large particles of granular silicon.

[0049] The working principle of this embodiment is as follows:

[0050] Vacuum feeding: connect the external power supply, and start the vacuum pump 1 controlled by the external control cabinet, and the specific parameters of the vacuum pump 1 are pre-set by the technicians in this field, so that when the vacuum pump 1 is started, the vacuum pump 1 will evacuate the filter bin 2, and then through the filter element 12, the feeding bin 3 and the suction pipe 4, the granular silicon raw material to be screened can be sucked into the feeding bin 3 through the suction pipe 4. After being sucked into the feeding bin 3, the density of the granular silicon is much greater than the density of air, so the granular silicon will fall into the feeding pipe 25, and the air will pass through the filter element 12 into the vacuum pump 1;

[0051] Quantitative screening: The control cabinet controls the motor 10 to start at the same time, and the output shaft of the motor 10 rotates, thereby driving the support shaft 21 to rotate. The support shaft 21 synchronously drives the floating ring 27 to rotate, and the upward elastic resisting force generated by the return spring 28 on the floating ring 27 causes the ball 32 at the end of the fixed pin 30 to roll alternately on the lower end surface of the fixed ring 31 and the downward side of the arc-shaped protrusion 29. Specifically, when the floating ring 27 rotates, the ball 32 rolls from the lower end surface of the fixed ring 31 to the lower surface of the arc-shaped protrusion 29. At this time, the ball 32 will be subjected to the downward force of the arc-shaped protrusion 29, thereby causing the floating ring 27 to drive the support shaft 21 to move downward, and the floating ring 27 drives the support shaft 21 to move downward. The spline hole on the support shaft 21 is key-connected with the output shaft of the motor 10, so that when the support shaft 21 moves downward, it will not affect the motor 10. At the same time, when the floating ring 27 moves downward, it will compress the return spring 28, and the return spring 28 will accumulate elastic potential energy. As the floating ring 27 continues to rotate, the ball 32 rolls from the surface of the arc-shaped protrusion 29 to the lower end surface of the fixed ring 31, and the elastic potential energy accumulated in the return spring 28 is released, and then the return spring 28 generates an upward force on the floating ring 27, so that the floating ring 27 drives the support shaft 21 to move upward, and so on and so forth, so that the support shaft 21 can drive the screening plate 16 to reciprocate up and down;

[0052] When the screen plate 16 moves upward, the plug 22 will be engaged in the conical groove, thereby preventing the raw materials in the feeding pipe 25 from continuing to enter between the screen plate 16 and the upper pressure plate 17, and as the support shaft 21 rotates, the screen plate 16 rotates relative to the upper pressure plate 17, so that the granular silicon raw material can be evenly spread in the area surrounded by the two adjacent arc-shaped ridges 26, and the small particles of granular silicon will fall through the sieve holes of the small sieve hole area 24. When the screen plate 16 rotates, it will produce friction with the larger particles of granular silicon. Driven by the friction force, the larger particles of granular silicon will be driven along the surface of the arc-shaped ridges 26 to the large sieve hole area 23, and the small particles The granular silicon will fall through the sieve holes of the small sieve hole area 24, and due to the provision of the transition area 33, the granular silicon of smaller particles will not enter the large sieve hole area 23 from the small sieve hole area 24, thereby preventing the granular silicon of smaller particles from entering the large sieve hole area 23, thereby achieving the separation of the granular silicon of larger particles and the granular silicon of smaller particles, and screening them by the large sieve hole area 23 and the small sieve hole area 24 respectively. In addition, due to the concave top surface of the sieve plate 16, when the sieve plate 16 and the upper pressing plate 17 are close to each other, the bottom surface of the upper pressing plate 17 will not exert a force on the granular silicon of smaller particles, or will not cause the granular silicon of smaller particles to be driven to the large sieve hole area 23;

[0053] When the support shaft 21 drives the screen plate 16 to move downward, the screen plate 16 moves away from the upper pressing plate 17, and the gap between the screen plate 16 and the upper pressing plate 17 increases, and the plug 22 is out of the engagement state with the conical groove. At this time, the granular silicon raw material in the feeding pipe 25 will be able to enter between the screen plate 16 and the upper pressing plate 17 from the lower end of the feeding pipe 25, and through the rotation of the screen plate 16, the granular silicon raw material will be dispersed into the area surrounded by the plurality of arc-shaped convex strips 26, so that the granular silicon raw material will be evenly dispersed on the top surface of the screen plate 16, avoiding the granular silicon raw material from accumulating on the top surface of the screen plate 16;

[0054] Falling material collection: The larger particles of granular silicon falling from the large sieve hole area 23 will fall into the large particle storage space 14 and be stored, while the small particles of granular silicon will pass through the sieve holes of the small sieve hole area 24 and fall onto the baffle plate 20, and roll along the baffle plate 20 to the small particle discharge port 7, thereby realizing the separate collection of large particles of granular silicon and small particles of granular silicon. In addition, a falling material gap 19 is formed between the periphery of the conical outer edge 15 and the inner cavity wall of the screening bin 5. The width of the falling material gap 19 is The value is consistent with the standard particle size value of granular silicon, so that even if a small amount of smaller granular silicon falls from the large sieve hole area 23, it can still fall into the baffle plate 20 through the blanking gap 19. In addition, a vibrator 11 is installed on the outer wall of the screening bin 5. When the vibrator 11 is started, it will vibrate the screening bin 5. The vibration force can vibrate the granular silicon stuck in the blanking gap 19, so that the smaller granular silicon can fall onto the baffle plate 20 more smoothly.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. An integrated device for automatic feeding and screening of granular silicon, characterized in that: include: A screening bin with an open bottom and connected to a bottom cover, wherein a feeding pipe is provided on the top of the screening bin, and the lower end of the feeding pipe extends into the interior of the screening bin; A feeding mechanism is arranged above the screening bin, and the feeding mechanism is connected with the screening bin; An upper pressing plate fixedly sleeved on the lower end of the feeding pipe, wherein the periphery of the upper pressing plate is engaged with the inner cavity of the screening bin; A support shaft is coaxially arranged on the end face of the bottom cover, the support shaft slides vertically and freely on the end face of the bottom cover, the upper end of the support shaft extends into the screening bin and is coaxially fixed with a screening plate, the screening plate is engaged with the inner cavity wall of the screening bin and slides vertically and freely, the end face of the screening plate is provided with a small sieve hole area and a large sieve hole area in sequence in the direction away from its axis, the screening plate is located below the upper pressing plate, and a plurality of arc-shaped convex strips are fixedly connected to the upper face of the screening plate, the arc-shaped convex strips are radially arranged on the end face of the screening plate, and a discharging mechanism is provided in the screening bin; A transition area is provided on the top surface of the sieve plate, the transition area is located between the small sieve hole area and the large sieve hole area, the top surface of the sieve plate is concave, and the thickness of the sieve plate increases gradually in the direction away from the small sieve hole area, so that the longitudinal distance between the top surface of the sieve plate and the bottom surface of the upper pressing plate decreases correspondingly in sequence, and the minimum value of the longitudinal distance is greater than the sieve hole diameter value of the small sieve hole area; The bottom of the bottom cover is connected to a mounting seat, a motor is installed at the lower end of the mounting seat, and the output shaft of the motor is drivingly connected to one end of the support shaft passing through the bottom cover; A spline hole is formed at the lower end of the support shaft, and the output shaft of the motor penetrates the spline hole and is key-connected with the spline hole. A floating mechanism is provided at the bottom of the bottom cover, and the floating mechanism is used to drive the support shaft to reciprocate vertically when the output shaft of the motor rotates; A plug is coaxially fixedly connected to the top of the screening plate, and a conical groove matching with the plug is provided at the lower end portion of the feeding pipe.

2. The integrated automatic feeding and screening equipment for granular silicon according to claim 1, characterized in that: The feeding mechanism includes a feeding bin connected to the upper end of the feeding pipe, the top of the feeding bin is open and connected to a filter bin, the lower end surface of the filter bin is closed and vertically penetrated by a plurality of filter elements, the lower end of the filter element extends to the inner cavity of the feeding bin, a vacuum pump is installed on the top of the filter bin, the air inlet end of the vacuum pump is communicated with the upper end of the filter bin, a suction pipe is installed on the outer wall of the feeding bin, and the suction pipe is communicated with the interior of the feeding bin.

3. The integrated automatic feeding and screening equipment for granular silicon according to claim 1, characterized in that: The floating mechanism includes a fixed ring fixedly connected to the bottom surface of the bottom cover, a floating ring fixedly sleeved on the lower end of the support shaft, the floating ring is located below the fixed ring, and the upper end surface of the floating ring is vertically fixed with two fixing pins, the lower end surface of the fixed ring is fixed with two arc-shaped protrusions, one end of the arc-shaped protrusion is in a smooth transition with the lower end surface of the fixed ring, an elastic member is provided in the mounting seat, the elastic member is used to generate an upward elastic resisting force on the floating ring, so that when the support shaft rotates, the top of the fixed ring is driven to alternately contact the lower end surface of the fixed ring and the surface of the arc-shaped protrusion, and a ball is rotatably embedded on the top of the fixing pin.

4. The integrated automatic feeding and screening equipment for granular silicon according to claim 3, characterized in that: The elastic member comprises a return spring vertically mounted on the bottom wall of the inner cavity of the mounting seat, and two ends of the return spring in the elastic force direction elastically press against the bottom wall of the inner cavity of the mounting seat and the lower end surface of the floating ring respectively and correspondingly.

5. The integrated automatic feeding and screening equipment for granular silicon according to claim 1, characterized in that: The discharging mechanism includes an annular portion coaxially fixed to the bottom of the screening plate, a conical outer edge coaxially fixed to the lower end of the annular portion, a large particle storage space is enclosed between the conical outer edge, the annular portion and the side wall of the inner cavity of the screening bin, the large particle storage space is connected with the large sieve hole area, a large particle discharge port connected with the large particle storage space is provided at the periphery of the screening bin, a baffle plate is obliquely fixed to the inner cavity wall of the screening bin, the support shaft penetrates the baffle plate and slides vertically freely, the baffle plate is located below the conical outer edge, and a small particle discharge port corresponding to the lower side of the baffle plate is provided at the periphery of the screening bin, and the small particle discharge port is connected with the interior of the screening bin.

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