Automatic feeding and screening all-in-one machine for granular silicon

Abstract

The invention belongs to the technical field of screening equipment, and particularly relates to a granular silicon automatic feeding and screening all-in-one machine which comprises a material receiving box. The device comprises a material receiving box, the top of the material receiving box is connected with a feeding hopper in a penetrating mode, a screening box is rotationally connected to the position, under the feeding hopper, in the material receiving box, a plurality of screening holes are formed in the bottom of the screening box, linear motors are fixedly installed on the two sides of the screening box correspondingly, and hanging rods are fixedly connected to moving bases of the two linear motors correspondingly. Through the swing design of the screening box and the synergistic effect of an extrusion roller and an air injection pipeline, screening holes are effectively prevented from being blocked, continuous screening of silicon particles is ensured, the screening efficiency is remarkably improved, the servo motor serves as a driving part, and the feeding hopper can be driven to automatically feed and the screening box can be driven to swing and screen materials at the same time; the material screening and conveying efficiency and the automation degree are improved, and stable operation of the production process is guaranteed.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of screening equipment, and particularly relates to a granular silicon automatic feeding and screening integrated machine. BACKGROUND

[0002] Granular silicon is a kind of material produced by chemical vapor deposition in a fluidized bed. The key process flow of the key equipment fluidized bed reactor is as follows: high-purity silicon seeds as seed crystals are added from the upper part of the fluidized bed reactor and form a seed particle bed layer. After the bed layer is heated to the required reaction temperature, a mixture of silane and hydrogen is introduced from the bottom of the reactor to make the seed bed layer reach a fluidized state. When the preheated mixed gas passes through the bed layer, the silane decomposes to form elemental silicon and deposits on the surface of the silicon seed crystal. In terms of reaction temperature, the temperature of silane pyrolysis in the fluidized bed is only 500-800 DEG C. The characteristics of the fluidized bed process bring multiple advantages to the production of polycrystalline silicon. The temperature distribution in the fluidized bed is relatively uniform, the surface area of silicon deposition in the reactor is large, the deposition rate is fast, and continuous feeding and discharging can be realized. As a raw material for producing silicon wafers, granular silicon is spherical, the circularity is greater than 0.92, the median particle size is about 2 mm, and the flowability is good, which can better meet the technical requirements of RCz and CCZ direct pulling single crystal technology and improve the complex investment efficiency. Therefore, a screening device is needed to screen the granular material with a median particle size of about 2 mm.

[0003] A granular silicon automatic feeding and screening integrated device is disclosed in a Chinese patent with the publication number CN119368410B, which 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 mesh area and a large mesh area. The screening plate is located below the upper pressing plate, and a plurality of arc-shaped protrusions are fixedly connected to the upper end surface of the screening plate. The arc-shaped protrusions are arranged in a radial manner on the end surface of the screening plate. A discharging mechanism is arranged in the screening bin. The application pushes the granular silicon to move by rotating the granular silicon through the extrusion of the upper pressing plate and the screening plate. The large mesh and the small mesh arranged on the screening plate screen the granular silicon.

[0004] In the current technical system, the granular silicon with a median particle size of about 2 mm is mainly screened by a screening plate to achieve precise separation. In this process, the size accuracy of the screening plate screen hole is particularly important, as it directly determines the accuracy and effect of screening. However, in actual operation, when the granular silicon is fed to the screening plate for screening, the particles collide with each other, generating a large amount of dust. These dusts not only adhere to the surface of the screen hole, causing serious pollution, but also gradually accumulate, affecting the permeability of the screen hole. More troublesome is that part of the granular silicon is easily stuck in the screen hole during the collision process, forming a blocking phenomenon, which seriously interferes with the normal progress of the screening process, reduces the screening efficiency and overall effect.

[0005] Therefore, the present invention provides an integrated automatic feeding and screening machine for granular silicon. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides an automatic feeding and screening machine for granular silicon, including a receiving box; a feeding hopper is connected through the top of the receiving box, and a screening box is rotatably connected inside the receiving box at a position directly below the feeding hopper. The bottom of the screening box has several screen holes. Linear motors are fixedly installed on both sides of the screening box. A hanging rod is fixedly connected to the moving base of each of the two linear motors. A support frame is fixedly connected to the end of each of the two hanging rods away from the linear motors. A crossbar and an air jet pipe are jointly arranged between the two support frames at a position below the screening box. A squeezing roller is rotatably connected to the crossbar. Several conical protrusions are provided on the outer surface of the squeezing roller. An air pump is fixedly connected to one side of the receiving box. A hose is fixedly connected to the output end of the air pump. Two rows of air jet holes are opened on the outer surface of the air jet pipe. An air inlet is provided at the end of the air jet pipe near the hose. The air inlet is fixedly connected to the hose. A discharge mechanism is connected through one end of the screening box. The discharge mechanism is used to discharge coarse material inside the screening box.

[0008] Preferably, the discharge mechanism includes a guide channel, one end of which is connected through to the screening box. Electric push rods are fixedly connected to both sides of the guide channel, and the telescopic ends of the two electric push rods are fixedly connected to a door panel. The door panel is movably connected through to the guide channel.

[0009] Preferably, both ends of the crossbar are provided with flexible extrusion mechanisms, which are used to drive the extrusion rollers on the crossbar to flexibly fit against the bottom of the screening box.

[0010] Preferably, the flexible extrusion mechanism includes a movable seat and a spring. The movable seat is fixedly connected to a crossbar. A slide rod is fixedly connected inside the support frame. One end of the slide rod is connected through the movable seat, and the slide rod and the movable seat are slidably engaged. The spring is sleeved on the other end of the slide rod, and one end of the spring is fixedly connected to the support frame. Lifting lugs are fixedly connected to both sides of the two support frames. The jet pipe is connected through the two sets of lifting lugs, and the extrusion roller is located on the central axis of the jet pipe.

[0011] Preferably, the plurality of sieve holes are arranged in a rectangular array and have equal diameters, the plurality of conical protrusions are arranged in a ring array, the longitudinal number of the plurality of conical protrusions is equal to the longitudinal number of the plurality of sieve holes, the outer diameter of the conical protrusions is smaller than the inner diameter of the sieve holes, and the top of the conical protrusions has a spherical structure.

[0012] Preferably, the feeding end inside the feeding hopper is provided with an impeller, and the impeller is rotatably connected to the feeding hopper through a first shaft, one end of which is fixedly connected with a small gear.

[0013] Preferably, a second shaft is fixedly connected to the center position of both sides of the screening box. The two second shafts pass through and rotate with the receiving box. The axes of the two second shafts are on the same straight line. A large gear is fixedly connected to one end of the second shaft close to the small gear, and the large gear meshes with the second shaft. A servo motor is provided on one end of the other second shaft, and the servo motor is fixedly installed on the receiving box.

[0014] Preferably, the screening box swings up and down around the second shaft at an angle of 50°.

[0015] Preferably, each of the two linear motors is provided with a proximity switch at both ends, and the two proximity switches are electrically connected to the linear motors through wires, and the two proximity switches are connected to the linear motors in parallel.

[0016] Preferably, a PLC controller is fixedly connected to the end of the receiving box away from the discharging mechanism, and the servo motor, air pump, linear motor and electric push rod are all electrically connected to the PLC controller via wires.

[0017] The beneficial effects of this invention are as follows: 1. The automatic feeding and screening machine for granular silicon described in this invention effectively prevents screen blockage and ensures continuous screening of granular silicon through the swing design of the screening box and the coordinated action of the extrusion roller and air jet pipe, significantly improving screening efficiency. Specifically, two linear motors work together to drive the crossbar and air jet pipe, allowing them to move flexibly at the bottom of the screening box. A rotatable extrusion roller is specially designed on the crossbar. When the crossbar moves, the extrusion roller can roll smoothly against the outer surface of the bottom of the screening box. During rolling, the conical protrusions on the outer surface of the extrusion roller can precisely embed into the screen holes, forcefully pushing out the granular silicon stuck in the screen holes, effectively preventing granular silicon from getting stuck and causing blockage. Simultaneously, since the air inlet of the air jet pipe is tightly connected to an air pump via a hose, turning on the air pump continuously supplies high-pressure gas into the air jet pipe. This high-pressure gas is powerfully ejected through evenly distributed air jet holes on the air jet pipe. The ejected gas acts like a highly efficient cleaning agent, quickly removing dust adhering to the screen holes and carrying the dust with the gas out from the top of the screening box. In this way, the screening box can automatically clean the screen holes during the screening of granular silicon, completely solving the clogging problem and significantly improving screening efficiency and overall effect.

[0018] 2. The automatic feeding and screening machine for granular silicon described in this invention, in the overall material screening and conveying system, uses a servo motor as the driving component to drive the second shaft to rotate, causing the screening box to rotate and swing on the receiving box. The vertical swing angle of the screening box is controlled at 50°. The large gear and small gear on the second shaft mesh to form a transmission mechanism. The rotation of the large gear causes the small gear to drive the first shaft and impeller to rotate, realizing automatic feeding. The entire system forms an organic whole, improving the efficiency and automation of material screening and conveying, and ensuring the stable operation of the production process. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view from the second angle in this invention; Figure 3 This is a schematic diagram showing the connection between the extrusion roller and the jet pipe in this invention; Figure 4 This is a schematic diagram of the connection between the extrusion roller and the support frame in this invention; Figure 5 This is a schematic diagram of the screening box in this invention; Figure 6 In this invention Figure 5 A magnified view of a portion of the image; Figure 7 This is a schematic diagram of the connection between the hopper and the impeller in this invention.

[0021] In the diagram: 1. Receiving box; 2. Screening box; 3. Feeding hopper; 4. Servo motor; 5. Air pump; 6. Hose; 7. Linear motor; 8. Hanging rod; 9. Support frame; 10. Crossbar; 11. Extrusion roller; 12. Air jet pipe; 13. Conical protrusion; 14. Air jet hole; 15. Slide rod; 16. Movable seat; 17. Spring; 18. Air inlet end; 19. Screen hole; 20. Electric push rod; 21. Door panel; 22. Impeller; 23. First shaft; 24. Second shaft; 25. Large gear; 26. Small gear; 27. Guide channel; 28. PLC controller. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] like Figures 1 to 7As shown, an embodiment of the present invention provides an automatic feeding and screening machine for granular silicon, comprising a receiving box 1; a feeding hopper 3 is connected through the top of the receiving box 1, and a screening box 2 is rotatably connected inside the receiving box 1 at a position directly below the feeding hopper 3. The bottom of the screening box 2 has several screen holes 19. Linear motors 7 are fixedly installed on both sides of the screening box 2. A suspension rod 8 is fixedly connected to the movable seat of each of the two linear motors 7. A support frame 9 is fixedly connected to the end of each suspension rod 8 away from the linear motor 7. The two support frames 9 are located below the screening box 2. A crossbar 10 and an air jet pipe 12 are provided together. A squeezing roller 11 is rotatably connected to the crossbar 10. Several conical protrusions 13 are provided on the outer surface of the squeezing roller 11. An air pump 5 is fixedly connected to one side of the receiving box 1. A hose 6 is fixedly connected to the output end of the air pump 5. Two rows of air jet holes 14 are opened on the outer surface of the air jet pipe 12. An air inlet 18 is provided at the end of the air jet pipe 12 near the hose 6. The air inlet 18 is fixedly connected to the hose 6. A discharge mechanism is connected through one end of the screening box 2. The discharge mechanism is used to discharge the coarse material inside the screening box 2.

[0024] Before using this embodiment of the invention to screen granular silicon, the device must be placed stably and horizontally on the ground to ensure stable and reliable operation. Then, the discharge channel of the granular silicon production line is precisely connected to the feeding hopper 3. This allows the granular silicon produced on the production line to be directly and smoothly fed into the feeding hopper 3, preparing it for subsequent screening.

[0025] When everything is ready and the screening process officially begins, the granular silicon in the feeding hopper 3 is first fed into the screening box 2 in an orderly manner. The screening box 2, with its carefully designed sieve holes 19, meticulously screens the input granular silicon. After screening, granular silicon that meets the fine material standard naturally falls into the receiving box 1 for centralized collection. By observing the fine material screening process, once the fine material filtration is complete, the discharge mechanism is opened to discharge the coarse material from the screening box 2. However, during the rolling screening of granular silicon in the screening box 2, the particles collide violently with each other, inevitably generating a large amount of dust. This dust adheres to the surface of the sieve holes 19, causing serious pollution and gradually accumulating, affecting the permeability of the sieve holes 19 and significantly reducing screening efficiency. Even more problematic is that some granular silicon easily becomes stuck inside the sieve holes 19 during the collision process, causing blockages. This phenomenon severely interferes with the normal progress of the screening process, thereby reducing the efficiency and overall effect of the entire screening operation.

[0026] In this embodiment of the invention, two linear motors 7 work together to drive the crossbar 10 and the air jet pipe 12, allowing them to move flexibly at the bottom of the screening box 2. A rotatable squeezing roller 11 is specially provided on the crossbar 10. When the crossbar 10 moves, the squeezing roller 11 can roll smoothly against the outer surface of the bottom of the screening box 2. During rolling, the conical protrusions 13 on the outer surface of the squeezing roller 11 can precisely embed into the screen holes 19, thereby forcefully pushing out the silicon particles stuck in the screen holes 19, effectively preventing the silicon particles from getting stuck and causing blockage. Simultaneously, since the air inlet 18 on the air jet pipe 12 is tightly connected to the air pump 5 through the hose 6, turning on the air pump 5 can continuously supply high-pressure gas into the air jet pipe 12. This high-pressure gas is powerfully ejected through the evenly distributed air jet holes 14 on the air jet pipe 12. The ejected gas acts like a highly efficient cleaning agent, quickly removing dust adhering to the screen holes 19 and carrying the dust with the gas out from the top of the screening box 2. In this way, the screening box 2 can automatically clean the screen holes 19 during the screening of granular silicon, completely solving the clogging problem and significantly improving screening efficiency and overall effect.

[0027] like Figure 6 As shown, the above-mentioned discharge mechanism includes a guide channel 27, one end of which is connected to the screening box 2. Electric push rods 20 are fixedly connected to both sides of the guide channel 27. The telescopic ends of the two electric push rods 20 are fixedly connected to a door panel 21. The door panel 21 is movably connected to the guide channel 27. During operation, once the granular silicon in the screening box 2 has completed the screening process, specifically when no more fine material can pass through the screen holes 19, it's time to discharge the remaining coarse material. At this point, the guide channel 27 needs to be opened to complete this operation. Specifically, two electric push rods 20 are activated, and they exert force synchronously to steadily push the door plate 21 upwards along the guide channel 27. As the door plate 21 rises, the guide channel 27, which was originally closed, is gradually opened, thus achieving smooth communication with the screening box 2. Then, by rotating the screening box 2, the end of the screening box 2 connected to the guide channel 27 tilts downwards. In this way, the remaining coarse material inside the screening box 2 can be smoothly discharged from the device through the guide channel 27 under its own gravity.

[0028] like Figure 3 and Figure 4As shown, both ends of the crossbar 10 are provided with flexible extrusion mechanisms. The flexible extrusion mechanisms are used to drive the extrusion rollers 11 on the crossbar 10 to flexibly fit against the bottom of the screening box 2. The flexible extrusion mechanism includes a movable seat 16 and a spring 17. The movable seat 16 is fixedly connected to the crossbar 10. A slide rod 15 is fixedly connected inside the support frame 9. One end of the slide rod 15 is connected through the movable seat 16. The slide rod 15 and the movable seat 16 are slidably engaged. The spring 17 is sleeved on the other end of the slide rod 15. One end of the spring 17 is fixedly connected to the support frame 9. Lifting lugs are fixedly connected to both sides of the two support frames 9. The jet pipe 12 is connected through the two sets of lifting lugs. The extrusion roller 11 is located on the central axis of the jet pipe 12. During operation, the extrusion roller 11 is securely mounted on the crossbar 10 via a rotatable connection, and the crossbar 10 is tightly connected to the support frame 9 via a flexible extrusion mechanism. Specifically, the movable seat 16 has the characteristic of sliding freely on the slide bar 15. When the extrusion roller 11 is precisely fitted to the bottom of the screening box 2, it will immediately receive a downward reaction force. This reaction force is quickly transmitted through the crossbar 10, thereby pulling the movable seat 16 connected to it downward to apply pressure, that is, to apply force to the spring 17 fixedly installed at the bottom of the movable seat 16. After being pressed, the spring 17, due to its elastic properties, will generate a reverse force. This reverse force gently extrudes the movable seat 16, enabling the movable seat 16 to drive the extrusion roller 11 to apply a flexible extrusion force to the bottom of the screening box 2. This flexible extrusion force is just right, ensuring that the extrusion roller 11 fits tightly against the bottom of the screening box 2 while allowing it to roll smoothly, thus ensuring that the entire device has better stability and flexibility during operation.

[0029] like Figure 4 and Figure 5 As shown, the aforementioned sieve holes 19 are arranged in a rectangular array and have the same diameter. The conical protrusions 13 are arranged in a ring array. The longitudinal number of the conical protrusions 13 is equal to the longitudinal number of the sieve holes 19. The outer diameter of the conical protrusions 13 is smaller than the inner diameter of the sieve holes 19, and the top of the conical protrusions 13 has a spherical structure. During operation, as the extrusion roller 11 rolls, the conical protrusion 13 precisely engages with the longitudinal arrangement of several screen holes 19 on the screening box 2. This design benefits from the unique dimensions of the conical protrusion 13, whose outer diameter is smaller than the inner diameter of the screen hole 19. This subtle dimensional difference allows the conical protrusion 13 to easily embed itself into the screen hole 19. Once the conical protrusion 13 is successfully embedded in the screen hole 19, it acts like a powerful "finger," steadily pushing out the silicon particles stuck in the screen hole 19, clearing the obstruction. The extrusion roller 11 does not stop there; it continues to roll laterally, using a reciprocating motion to thoroughly and meticulously clean the numerous screen holes 19 on the screening box 2. Each roll ensures the unobstructed flow of the screen holes, guaranteeing efficient and smooth screening operations.

[0030] like Figure 7 As shown, an impeller 22 is provided at the discharge end inside the feeding hopper 3. The impeller 22 is rotatably connected to the feeding hopper 3 through a first shaft 23. A small gear 26 is fixedly connected to one end of the first shaft 23. During operation, the impeller 22 is connected to the discharge end inside the feeding hopper 3 via a first shaft 23, and the first shaft 23 is rotatably engaged with the feeding hopper 3. A small gear 26 is fixed to one end of the first shaft 23. When the small gear 26 is driven to rotate, it drives the impeller 22 to rotate inside the discharge end of the feeding hopper 3. The rotating impeller 22, through its blades, carries the granular silicon particles inside the feeding hopper 3 for discharge. This impeller-based discharge method has significant advantages over traditional gravity discharge or other discharge methods. It enables continuous and stable material conveying, improves discharge efficiency, avoids production interruptions and equipment damage caused by discharge blockages, and ensures the reliability and stability of the entire material conveying system.

[0031] like Figure 1 and Figure 2 As shown, two second shafts 24 are fixedly connected to the center positions of both sides of the screening box 2. The two second shafts 24 pass through and rotate with the receiving box 1. The axes of the two second shafts 24 are on the same straight line. A large gear 25 is fixedly connected to one end of the second shaft 24 near the small gear 26, and the large gear 25 meshes with the second shaft 24. A servo motor 4 is provided on one end of the other second shaft 24, and the servo motor 4 is fixedly installed on the receiving box 1. The screening box 2 swings up and down around the second shaft 24 as the axis, and the swing angle is 50°. During operation, the servo motor 4 serves as the driving component in the overall material screening and conveying system. This servo motor 4 possesses precise speed and torque control capabilities, enabling it to stably and reliably drive the connected second shaft 24 to rotate. The screening box 2 is mounted on the receiving box 1 via two fixedly installed second shafts 24 in a rotatable connection. This design allows for a flexible relative motion relationship between the screening box 2 and the receiving box 1. Driven by the servo motor 4, the second shafts 24 begin to rotate, thereby causing the screening box 2 to rotate and swing on the receiving box 1. Through precise design and debugging, the vertical swing angle of the screening box 2 is strictly controlled within 50°. This specific swing angle range ensures that the silica particles within the screening box 2 are fully and effectively screened, while avoiding equipment instability or material spillage caused by excessive swing amplitude. A large gear 25 is securely fixedly installed on one of the second shafts 24. This large gear 25 and the small gear 26 employ a precise meshing mechanism, forming a highly efficient gear transmission mechanism. When the servo motor 4 drives the screening box 2 to swing, the rotation of the second shaft 24 synchronously drives the large gear 25 to rotate. Since the large gear 25 meshes with the small gear 26, according to the principle of gear transmission, the rotation of the large gear 25 is transmitted to the small gear 26, causing it to produce a proportional rotational motion. The small gear 26 is connected to the impeller 22 via the first shaft 23. When the small gear 26 rotates, it drives the first shaft 23 to rotate synchronously, thereby driving the impeller 22 to rotate. The impeller 22 has blades of a specific shape and angle designed on its surface. During rotation, these blades generate a strong entrainment force, driving the granular silicon along a predetermined conveying path, achieving automatic feeding. In this way, driven by the servo motor 4, the entire system forms an organic whole. While driving the granular silicon for fluid screening, the screening box 2, through the synergistic action of the gear transmission mechanism and the impeller, achieves automatic feeding, greatly improving the efficiency and automation of material screening and conveying, and providing a strong guarantee for the stable operation of the entire production process.

[0032] like Figure 5 As shown, both ends of the two linear motors 7 are equipped with proximity switches. Both proximity switches are electrically connected to the linear motors 7 via wires, and the two proximity switches are connected to the linear motors 7 in parallel. During operation, two proximity switches are installed at each end of the linear motor 7. These two proximity switches serve as key control elements, precisely regulating the on / off operation of the linear motor 7. The two proximity switches control the moving base of the linear motor 7 to move in opposite directions. When the system starts, the screening box 2 is in its initial position, with its left end tilted to its lowest point. At this time, the material accumulated inside the screening box 2 rolls down to the left end under gravity, initiating the screening operation. Simultaneously, the movable base on the linear motor 7 is located at the rightmost end of the screening box 2. The movable base is closest to the proximity switch on the right end of the linear motor 7, triggering the proximity switch to open it. When the proximity switch on the right end of the linear motor 7 is activated, it sends a control signal to drive the movable seat to move to the left. As the movable seat moves to the left, it causes the screening box 2 to tilt to the right. This process demonstrates the kinematic relationship between the linear motor 7 and the screening box 2; that is, the movement of the movable seat of the linear motor 7 will cause the screening box 2 to tilt accordingly. When the screening box 2 tilts to the right to its lowest point, the movable seat of the linear motor 7 is exactly at the leftmost end of the screening box 2. At this time, the movable seat is closest to the proximity switch at the left end of the linear motor 7, triggering the proximity switch. After receiving the signal, the proximity switch at the left end of the linear motor 7 controls the movable seat to move to the right. At the same time, the screening box 2 tilts to the right again under the action of the mechanical structure, ensuring that the movement of the screening box 2 and the movement of the movable seat of the linear motor 7 maintain an opposite relationship. Through the aforementioned motion control, the downward tilt direction of the screening box 2 is always opposite to the direction of movement of the movable seat of the linear motor 7. This reverse motion mechanism has significant advantages: when one side of the screening box 2's screen holes 19 is screening granular silicon, the material flow direction of the other side's screen holes 19 changes due to the change in the tilt direction of the screening box 2, thus cleaning the screen holes 19 and effectively preventing screen blockage. For example, when the left-end screen hole 19 of the screening box 2 is screening, the material in the right-end screen hole 19 no longer accumulates there due to the rightward tilt of the screening box 2, and some of the stuck granular silicon may fall off due to gravity, achieving the effect of cleaning and preventing blockage; the reverse is also true.

[0033] like Figure 1 and Figure 2 As shown, a PLC controller 28 is fixedly connected to the end of the receiving box 1 away from the discharge mechanism. The servo motor 4, air pump 5, linear motor 7 and electric push rod 20 are all electrically connected to the PLC controller 28 through wires. During operation, the PLC controller 28 has precise and independent control capabilities, which can effectively regulate the operating status of the servo motor 4, air pump 5, linear motor 7 and electric push rod 20, ensuring that each device operates stably and efficiently according to the preset program.

[0034] Working process: First, material is fed in. An impeller 22 is installed inside the feeding hopper 3. The impeller 22 is rotatably connected to the feeding hopper 3 via a first shaft 23. One end of the first shaft 23 is connected to a pinion 26. When the pinion 26 is driven to rotate, the impeller 22 rotates accordingly. The impeller 22 carries the silicon particles through its blades, thus feeding the material continuously and stably.

[0035] The granular silicon fed into the screening box 2 is then screened. The screening box 2 is rotatably connected to the receiving box 1 via a second shaft 24 and swings up and down around the second shaft 24 under the drive of the servo motor 4, with a swing angle of 50°. This swing design allows the granular silicon to flow fully within the screening box 2, improving screening efficiency. Several screen holes 19 of equal diameter are provided at the bottom of the screening box 2. Granular silicon that meets the fine material standard falls into the receiving box 1 through the screen holes 19, thus achieving screening.

[0036] Simultaneously, the sieve holes 19 of the screening box 2 can be cleaned during the screening process. Linear motors 7 are installed on both sides of the screening box 2. The moving base of the linear motors 7 is connected to the support frame 9 through the hanging rod 8. A crossbar 10 and an air jet pipe 12 are arranged between the support frames 9. A squeezing roller 11 is rotatably connected to the crossbar 10. Several conical protrusions 13 are provided on the outer surface of the squeezing roller 11. The linear motors 7 drive the crossbar 10 and the air jet pipe 12 to move at the bottom of the screening box 2. The squeezing roller 11 rolls tightly against the bottom of the screening box 2, and the conical protrusions 13 embed into the sieve holes 19, pushing out the stuck silicon particles and preventing the sieve holes 19 from clogging. The air jet pipe 12 delivers high-pressure gas through the air pump 5. The gas is sprayed out through the air jet hole 14 to remove the dust adhering to the sieve holes 19 and drive the dust to be discharged from the top of the screening box 2, realizing the automatic cleaning of the sieve holes 19.

[0037] After screening, the material is discharged. Since a discharge mechanism, including a guide channel 27, an electric push rod 20, and a door panel 21, is connected to one end of the screening box 2, the electric push rod 20 pushes the door panel 21 to open the guide channel 27. By rotating the screening box 2, the end connected to the guide channel 27 tilts downward to discharge the coarse material remaining inside.

[0038] Finally, proximity switches are installed at both ends of the linear motor 7 to control the reciprocating motion of the moving base of the linear motor 7. The moving base will drive the connected air jet pipe 12 and the extrusion roller to move and clean the screen holes 19 of the screening box 2. At the same time, the servo motor 4 will drive the screening box 2 to swing, thereby controlling the tilt direction of the screening box 2 and realizing the synergistic effect of screening and cleaning. The PLC controller 28 independently controls the operating status of the servo motor 4, air pump 5, linear motor 7 and electric push rod 20 to ensure that each device operates stably according to the preset program.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An integrated automatic feeding and screening machine for granular silicon, characterized in that: The utility model provides a kind of material receiving box, including the material receiving box;The top of the material receiving box is connected with upper hopper, the inside of the material receiving box is rotatably connected with screening box at the position of upper hopper directly below, the bottom of the screening box is equipped with several sieve holes, the both sides of the screening box are fixedly installed with linear motor, the moving seat of two linear motors is fixedly connected with hanger pole, the one end of two hanger poles is fixedly connected with support frame away from linear motor, the support frame is commonly provided with crosspiece and air jet duct between the both sides of two support frames below screening box, the crosspiece is rotatably connected with extrusion roller, the outer surface of the extrusion roller is provided with several conical bosses, the one side of the material receiving box is fixedly connected with air pump, the output of the air pump is fixedly connected with hose, the outer surface of the air jet duct is equipped with two rows of air injection holes, the one end of the air jet duct is provided with air inlet end close to hose, air inlet end is fixedly connected with hose, the one end of the screening box is rotatably connected with discharging mechanism, and discharging mechanism is used to discharge coarse material in the inside of screening box.

2. The automatic granular silicon feeding and screening integrated machine according to claim 1, characterized in that: The discharging mechanism includes a guide channel, one end of the guide channel is rotatably connected to the screening box, the both sides of the guide channel are fixedly connected with electric push rod, the telescopic ends of the two electric push rods are fixedly connected with a door plate, and the door plate is rotatably connected to the guide channel.

3. The automatic granular silicon feeding and screening integrated machine according to claim 2, characterized in that: The both ends of the crosspiece are provided with flexible extrusion mechanisms, and the flexible extrusion mechanisms are used to make the extrusion roller on the crosspiece flexibly adhere to the bottom of the screening box.

4. The automatic granular silicon feeding and screening integrated machine according to claim 3, characterized in that: The flexible extrusion mechanism includes a movable seat and a spring, the movable seat is fixedly connected to the crosspiece, the inside of the support frame is fixedly connected with a slide rod, one end of the slide rod is rotatably connected to the movable seat, the slide rod is slidably connected to the movable seat, the spring is sleeved on the other end of the slide rod, one end of the spring is fixedly connected to the support frame, the both sides of the two support frames are fixedly connected with lugs, the air jet duct is rotatably connected to the two groups of lugs, and the extrusion roller is located on the central axis of the air jet duct.

5. The automatic granular silicon feeding and screening integrated machine according to claim 4, characterized in that: The sieve holes are arranged in a rectangular array, and the diameters are equal, the conical bosses are arranged in a ring array, the longitudinal number of the conical bosses is equal to the longitudinal number of the sieve holes, the outer diameter of the conical bosses is smaller than the inner diameter of the sieve holes, and the top end of the conical boss is in a spherical structure.

6. The automatic granular silicon feeding and screening integrated machine according to claim 5, characterized in that: A blade wheel is arranged at the lower end of the inside of the upper hopper, the blade wheel is rotatably connected to the upper hopper through a first shaft, and one end of the first shaft is fixedly connected with a pinion.

7. The automatic granular silicon feeding and screening integrated machine according to claim 6, characterized in that: Second shafts are fixedly connected to the central positions of the both sides of the screening box, the two second shafts are rotatably connected to the material receiving box, the shafts of the two second shafts are located on the same straight line, a large gear is fixedly connected to one end of the second shaft close to the pinion, the large gear is meshingly connected to the second shaft, a servo motor is arranged on the other end of the second shaft, and the servo motor is fixedly installed on the material receiving box.

8. The automatic granular silicon feeding and screening all-in-one machine according to claim 7, characterized in that: The screening box swings up and down around the second shaft, and the swing angle is 50°.

9. The automatic granular silicon feeding and screening integrated machine according to claim 8, characterized in that: Proximity switches are arranged on the both ends of the two linear motors, the two proximity switches are electrically connected to the linear motors through wires, and the two proximity switches are connected to the linear motors in parallel.

10. The automatic granular silicon feeding and screening integrated machine according to claim 9, characterized in that: The PLC controller is fixedly connected to one end of the material receiving box away from the material discharging mechanism, and the servo motor, the air pump, the linear motor and the electric push rod are electrically connected with the PLC controller through electric wires.

Images