Closed particle silicon feeding device

Abstract

The invention provides a closed particle silicon feeding device, and belongs to the technical field of particle silicon processing. The closed particle silicon feeding device comprises a pneumatic conveying mechanism, a cyclone separator is arranged at the tail end of the conveying mechanism, a dust removal mechanism is arranged at a gas outlet of the cyclone separator, the conveying mechanism comprises an air compressor, an air outlet and an air suction opening are formed in the air compressor, and the air suction opening is communicated with the air suction opening. An air outlet of the dust removal mechanism is conditionally communicated with the air suction opening, a temporary storage box is arranged at a solid outlet of the cyclone separator, and two cavities capable of being opened and closed are sequentially arranged in the temporary storage box from top to bottom. In the application, an air compressor outputs high-speed nitrogen to carry particle silicon to be conveyed to a cyclone separator, gas carrying dust enters a dust removal mechanism and then returns to the air compressor to realize nitrogen circulation, and two cavities of a temporary storage box are alternately opened to carry out static electricity removal and weighing operation on the particle silicon, so that the particle silicon is subjected to static electricity removal and weighing operation; and the sealing of a solid outlet of the cyclone separator and the quantitative feeding of the granular silicon are ensured.

Description

Technical Field

[0001] The present application relates to the technical field of granular silicon processing, and in particular to a closed granular silicon feeding device. Background Art

[0002] In the photovoltaic and semiconductor industries, high-purity granular silicon serves as a core raw material, and the stability and cleanliness of its closed gas conveying system directly impact product quality. During traditional pneumatic conveying of granular silicon, friction between silicon particles and the pipe wall easily leads to static electricity accumulation, resulting in problems such as particle agglomeration, pipe wall adsorption, and dust emission. Existing technologies often rely on external ion blowers or conductive material modification to eliminate static electricity. However, in a closed inert gas environment, ion injection efficiency is low and there is a risk of gas contamination. Dust removal solutions often use multi-stage filtration or cyclone separation, but high-precision filtration is prone to clogging, and it is difficult to simultaneously address the secondary emission of micron-sized dust caused by static electricity. Summary of the Invention

[0003] In order to make up for the above deficiencies, the present application provides a closed granular silicon feeding device, which aims to improve the problems mentioned in the above background technology.

[0004] An embodiment of the present application provides a closed granular silicon feeding device, including a pneumatic conveying mechanism, a cyclone separator is provided at the end of the conveying mechanism, a dust removal mechanism is provided at the gas outlet of the cyclone separator, the conveying mechanism includes an air compressor, the air compressor is provided with an air outlet and an air intake, the air outlet of the dust removal mechanism is conditionally connected to the air intake, the solid outlet of the cyclone separator is provided with a temporary storage box, the temporary storage box is provided with two openable and disconnectable chambers in sequence from top to bottom, and an electrostatic removal mechanism and a weighing mechanism are respectively provided in the two chambers, and a balancing valve is provided on the temporary storage box, and the two ends of the balancing valve are respectively connected to the two chambers.

[0005] In a specific embodiment, the dust removal mechanism includes a filter box, the filter box is fixedly connected to the gas outlet of the cyclone separator, a filter screen is provided in the filter box, and an exhaust pipe is provided on the filter box.

[0006] In the above implementation process, the dust-laden gas enters the filter box, is filtered by the filter, and then returns to the air compressor from the exhaust pipe. It should be noted that the air compressor integrates a nitrogen generator, a pressure sensor, and is connected to a PLC controller. When it detects that the circulating nitrogen pressure is lower than the threshold, the air supply valve is automatically started to inject new nitrogen to maintain the system pressure balance. In addition, a pressure relief valve is provided to avoid excessive pressure.

[0007] In a specific embodiment, the filter screen is plugged into the filter box, and the filter screen is screwed to the filter box.

[0008] In the above implementation process, a slot is provided in the filter box, and the filter screen is plugged in for easy replacement. After replacement, it is fastened with screws, and a sealing strip is provided on the fitting surface to improve the sealing performance.

[0009] In a specific embodiment, a dust exhaust pipe is provided at the lower end of the filter box, and valves are provided on the dust exhaust pipe and the gas outlet of the cyclone separator. A dust removal motor is provided on one side of the filter box, and a rotating shaft is fixedly connected to the output end of the dust removal motor, and the two valves are fixedly connected to the rotating shaft.

[0010] In the above implementation process, during backflushing, the dust removal motor drives the shaft to rotate, so that the valve of the dust exhaust pipe opens, and at the same time the valve on the gas outlet of the cyclone separator is closed, and gas is injected into the upper part of the filter box. The gas passes through the filter in the opposite direction, blows the dust on the filter off, and discharges it from the dust exhaust pipe. This can effectively increase the service life of the filter and reduce the frequency of filter maintenance and replacement. It should be noted that during backflushing, since nitrogen is used, when the filter box re-enters the filtering state, the oxidation effect of other gases such as oxygen on the granular silicon can also be avoided. During backflushing, the air compressor automatically starts the air supply valve to inject new nitrogen to maintain the system pressure balance. In this embodiment, the dust removal motor adopts a servo-controlled reduction motor.

[0011] In a specific embodiment, the conveying mechanism further includes a Venturi mixer, which is arranged at the air outlet, the Venturi mixer outlet is connected to the air inlet of the cyclone separator, and the Venturi mixer feed pipe is connected to the granular silicon storage box.

[0012] In the above implementation process, nitrogen forms negative pressure at the Venturi mixer, sucks the material in the granular silicon storage bin, forms a gas-solid two-phase flow, and is then transmitted. The conveying pipeline is coated with a conductive coating to reduce static electricity accumulation.

[0013] In a specific embodiment, the conveying mechanism also includes a reversing valve A and a reversing valve B, the air inlet of the reversing valve A is connected to the air outlet, one of the outlets of the reversing valve A is connected to the air inlet end of the venturi mixer, the other outlet of the reversing valve A is connected to one of the outlets of the reversing valve B, the other outlet of the reversing valve B is connected to the air suction port, and the inlet of the reversing valve B is connected to the filter box.

[0014] In the above implementation process, during normal delivery, the air compressor pushes nitrogen through the reversing valve A into the Venturi mixer to carry the material, and the gas filtered by the filter box returns to the air compressor through the reversing valve B; during backflushing, nitrogen enters the reversing valve B through the reversing valve A, and the reversing valve B injects nitrogen into the filter box to backflush the filter. At this time, the Venturi mixer stops carrying the material due to the lack of high-speed gas. Therefore, the timing of backflushing needs to be selected during the feeding interval and maintenance to reduce the impact on normal feeding.

[0015] In a specific embodiment, the static electricity removal mechanism includes a grounded dispersion plate, which is fixedly connected to the inner wall of the temporary storage box. A spherical protrusion is provided on the dispersion plate facing the solid outlet of the cyclone separator. A gate A is provided on one side of the dispersion plate. The gate A is hinged to the inner wall of the temporary storage box, the gate A abuts against the dispersion plate, and the gate A is powered by a door motor A.

[0016] In the above implementation process, the dispersion plate is well grounded, and the granular silicon falls from the solid outlet of the cyclone separator, falls on the spherical bulge, is broken up, and then falls along the dispersion plate so that the granular silicon contacts the dispersion plate and transfers the static electricity to the dispersion plate, thereby achieving the effect of removing static electricity, and finally falls on gate A. Gate A and the dispersion plate separate the temporary storage box into two upper and lower chambers.

[0017] In a specific embodiment, a suspension rod is fixedly connected under the dispersion plate, and a perforated plate is fixedly connected under the suspension rod.

[0018] In the above implementation process, the perforated plate is fixed to the dispersion plate by a hanger and is also grounded. The granular silicon falling from the dispersion plate falls along the opened gate A onto the perforated plate and falls along the perforated plate for secondary static removal. The holes can increase the contact between the granular silicon and the perforated plate, thereby improving the static removal effect, and the perforated plate can disperse the position where the granular silicon falls, avoiding local impact on the weighing mechanism below, thereby improving the durability of the weighing mechanism.

[0019] In a specific embodiment, the weighing mechanism includes a hopper and a sensor, the sensor is installed on the bottom wall of the temporary storage box, the hopper is installed on the sensor, the hopper is located below the perforated plate, and a gate B is provided at the bottom of the temporary storage box, and the gate B is powered by a door motor B.

[0020] In the above implementation process, granular silicon falls into the hopper and is weighed. After weighing, gate A is closed, and the granular silicon falling from the cyclone separator will be temporarily stored on the dispersion plate, while ensuring the sealing of the solid outlet of the cyclone separator until gate B is opened to discharge the weighed material, thereby achieving quantitative feeding. Then gate A is opened and granular silicon continues to fall into the hopper. In this embodiment, gate motor A and gate motor B are both servo reduction motors, and the output end is fixedly connected to the hinge shaft of gate A and gate B to drive gate A and gate B to open and close. The sensor is a spoke-type weighing sensor.

[0021] In a specific embodiment, a gate C is provided under the temporary storage box and corresponds to the gate B, and the gate C is poweredly connected to a door motor C.

[0022] In the above implementation process, gate C is opened synchronously when gate B is opened, so that the granular silicon in the hopper will be thrown directly downward. Only after gate C is closed can gate A be opened to ensure that the temporary storage box is always in a closed state and that the cyclone separator can continue to separate. In this embodiment, the door motor C adopts a double-headed setting, which synchronously drives the two double-headed screws to rotate. There are two gates C, which are screwed to the screws, so that gate C can be opened and closed horizontally, thereby achieving a large-scale and highly airtight switching effect. It should be noted that when the upper chamber is opened, the space increases instantly, which will back-suck the gas and dust in the cyclone separator, so the two chambers are connected by a balancing valve. After gate C is closed and before gate A is opened, the balancing valve is turned on, and the airflow in the upper chamber flows to the lower chamber through the balancing valve, so that the air pressure in the two chambers is gradually balanced, which can effectively reduce the back-sucking phenomenon when gate A is opened.

[0023] Compared with the existing technology, the beneficial effects of the present application are: the air compressor outputs high-speed nitrogen to carry the granular silicon to the cyclone separator, and the gas carrying dust enters the dust removal mechanism and then returns to the air compressor to realize nitrogen circulation, and the two chambers of the temporary storage box are opened alternately to remove static electricity and weigh the granular silicon, and ensure the closure of the solid outlet of the cyclone separator and the quantitative discharge of the granular silicon. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the following is a brief introduction to the drawings required for use in the implementation methods. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a schematic diagram of a closed granular silicon feeding device provided in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of the connection relationship between the dust removal mechanism and the cyclone separator provided in the embodiment of the present application;

[0027] Figure 3 A schematic diagram of the connection relationship between the temporary storage box and the cyclone separator provided in an embodiment of the present application;

[0028] Figure 4 Schematic diagram of the connection relationship of the static electricity removal structure domain weighing mechanism provided in the embodiment of this application.

[0029] In the figure: 10- conveying mechanism; 11- air compressor; 12- air outlet; 13- air intake; 14- venturi mixer; 15- reversing valve A; 16- reversing valve B; 20- cyclone separator; 30- dust removal mechanism; 31- filter box; 32- filter screen; 33- exhaust pipe; 34- dust exhaust pipe; 35- dust removal motor; 36- rotating shaft; 37- valve; 40- temporary storage box; 41- gate C; 42- door motor C; 50- static electricity removal mechanism; 51- dispersion plate; 52- gate A; 53- door motor A; 54- boom; 55- perforated plate; 60- weighing mechanism; 61- hopper; 62- sensor; 63- gate B; 64- door motor B; 70- balancing valve. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0031] See also Figures 1-4 The present application provides a closed granular silicon feeding device, including a pneumatic conveying mechanism 10, a cyclone separator 20 is provided at the end of the conveying mechanism 10, and a dust removal mechanism 30 is provided at the gas outlet of the cyclone separator 20. The conveying mechanism 10 includes an air compressor 11, and the air compressor 11 is provided with an air outlet 12 and an air intake 13. The air outlet of the dust removal mechanism 30 is conditionally connected to the air intake 13, and the solid outlet of the cyclone separator 20 is provided with a temporary storage box 40. The temporary storage box 40 is provided with two chambers that can be opened and closed in sequence from top to bottom, and the two chambers are respectively provided with a static removal mechanism 50 and a weighing mechanism 60. A balancing valve 70 is provided on the temporary storage box 40, and the two ends of the balancing valve 70 are respectively connected to the two chambers. Among them, the air compressor 11 outputs high-speed nitrogen carrying granular silicon to the cyclone separator 20, and the gas carrying dust enters the dust removal mechanism 30 and then returns to the air compressor 11 to realize nitrogen circulation. The two chambers of the temporary storage box 40 are opened alternately to remove static electricity and weigh the granular silicon, and ensure the closure of the solid outlet of the cyclone separator 20 and the quantitative discharge of granular silicon.

[0032] See also Figures 1-4The dust removal mechanism 30 includes a filter box 31, which is fixedly connected to the gas outlet of the cyclone separator 20. A filter screen 32 is provided in the filter box 31, and an exhaust pipe 33 is provided on the filter box 31. The gas containing dust enters the filter box 31, is filtered by the filter screen 32, and then returns to the air compressor 11 from the exhaust pipe 33. It should be noted that the air compressor 11 integrates a nitrogen generator and a pressure sensor 62 and is connected to the PLC controller. When it detects that the circulating nitrogen pressure is lower than the threshold, the air supply valve is automatically started to inject new nitrogen to maintain the system pressure balance. In addition, a pressure relief valve is provided to avoid excessive pressure.

[0033] See also Figures 1-4 , the filter screen 32 is plugged into the filter box 31, and the filter screen 32 is screwed to the filter box 31. A slot is provided in the filter box 31, and the filter screen 32 is plugged in for easy replacement. After replacement, it is fastened by screws, and a sealing strip is provided on the fitting surface to improve the sealing performance.

[0034] See also Figures 1-4 A dust exhaust pipe 34 is provided at the lower end of the filter box 31, and valves 37 are provided on the dust exhaust pipe 34 and the gas outlet of the cyclone separator 20. A dust removal motor 35 is provided on one side of the filter box 31, and a rotating shaft 36 is fixedly connected to the output end of the dust removal motor 35. Two valves 37 are fixedly connected to the rotating shaft 36. During backflushing, the dust removal motor 35 drives the rotating shaft 36 to rotate, so that the valve 37 of the dust exhaust pipe 34 opens, and at the same time the valve 37 on the gas outlet of the cyclone separator 20 is closed, and gas is injected into the upper part of the filter box 31. The gas passes through the filter 32 in the opposite direction, blows the dust on the filter 32 off, and discharges it from the dust exhaust pipe 34. This can effectively increase the service life of the filter 32 and reduce the maintenance and replacement frequency of the filter 32. It should be noted that during backflushing, since nitrogen is used, when the filter box 31 re-enters the filtering state, the oxidation effect of other gases such as oxygen on the granular silicon can also be avoided. During backflushing, the air compressor 11 automatically starts the air supply valve to inject new nitrogen to maintain the system pressure balance. In this embodiment, the dust removal motor 35 adopts a servo-controlled reduction motor.

[0035] See also Figures 1-4 Conveying mechanism 10 also includes a Venturi mixer 14, located at air outlet 12. The outlet of Venturi mixer 14 communicates with the air inlet of cyclone separator 20, and the feed pipe of Venturi mixer 14 communicates with the granular silicon storage bin. Nitrogen creates a negative pressure at Venturi mixer 14, drawing material from the granular silicon storage bin into the gas-solid two-phase flow for transport. The conveying pipe is coated with a conductive coating to reduce static electricity accumulation.

[0036] See also Figures 1-4The conveying mechanism 10 also includes a reversing valve A15 and a reversing valve B16. The air inlet of the reversing valve A15 is connected to the air outlet 12, one of the outlets of the reversing valve A15 is connected to the air inlet end of the venturi mixer 14, the other outlet of the reversing valve A15 is connected to one of the outlets of the reversing valve B16, the other outlet of the reversing valve B16 is connected to the air suction port 13, and the inlet of the reversing valve B16 is connected to the filter box 31. During normal delivery, the air compressor 11 pushes nitrogen through the reversing valve A15 into the Venturi mixer 14 to carry the material. The gas filtered by the filter box 31 returns to the air compressor 11 through the reversing valve B16. During backflushing, the nitrogen enters the reversing valve B16 through the reversing valve A15. The reversing valve B16 injects the nitrogen into the filter box 31 to backflush the filter screen 32. At this time, the Venturi mixer 14 stops carrying the material due to the lack of high-speed gas. Therefore, the timing of backflushing should be selected during the feeding interval and maintenance to reduce the impact on normal feeding.

[0037] See also Figures 1-4 The static electricity removal mechanism 50 includes a grounded dispersion plate 51, which is fixedly connected to the inner wall of the temporary storage box 40. A spherical protrusion is provided on the dispersion plate 51, facing the solids outlet of the cyclone separator 20. A gate A52 is provided on one side of the dispersion plate 51. The gate A52 is hinged to the inner wall of the temporary storage box 40, abuts against the dispersion plate 51, and is powered by a door motor A53. The dispersion plate 51 is well grounded. Granular silicon falls from the solids outlet of the cyclone separator 20, falls on the spherical protrusion, is broken up, and then falls along the dispersion plate 51, so that the granular silicon contacts the dispersion plate 51, transfers the static electricity to the dispersion plate 51, and achieves the static electricity removal effect. Finally, the granular silicon falls on the gate A52. The gate A52 and the dispersion plate 51 separate the temporary storage box 40 into two upper and lower chambers.

[0038] See also Figures 1-4 A suspension rod 54 is fixedly connected to the bottom of the dispersion plate 51, and a perforated plate 55 is fixedly connected to the bottom of the suspension rod 54. The perforated plate 55 is fixed to the dispersion plate 51 through the suspension rod 54 and is also grounded. The granular silicon falling from the dispersion plate 51 falls along the opened gate A52 onto the perforated plate 55, and then falls along the perforated plate 55 for secondary static removal. The holes can increase the contact between the granular silicon and the perforated plate 55, thereby improving the static removal effect. In addition, the perforated plate 55 can disperse the falling positions of the granular silicon to avoid local impact on the weighing mechanism 60 below, thereby improving the durability of the weighing mechanism 60.

[0039] See also Figures 1-4The weighing mechanism 60 includes a hopper 61 and a sensor 62. The sensor 62 is installed on the bottom wall of the temporary storage box 40. The hopper 61 is installed on the sensor 62. The hopper 61 is located below the perforated plate 55. A gate B63 is provided at the bottom of the temporary storage box 40. The gate B63 is powered by a door motor B64. The granular silicon falls into the hopper 61 and is weighed. After the weighing is completed, the gate A52 is closed, and the granular silicon falling from the cyclone separator 20 will be temporarily stored on the dispersion plate 51, while ensuring the sealing of the solid outlet of the cyclone separator 20, until the gate B63 is opened to discharge the weighed material, realizing quantitative feeding, and then the gate A52 is opened to allow the granular silicon to continue to fall into the hopper 61. In this embodiment, the door motor A53 and the door motor B64 are both servo reduction motors, and the output end is fixedly connected to the hinge shaft of the gate A52 and the gate B63 to drive the gate A52 and the gate B63 to open and close, and the sensor 62 is a spoke-type weighing sensor 62.

[0040] See also Figures 1-4 A gate C41 corresponding to the gate B63 is provided under the temporary storage box 40, and the gate C41 is powered by a door motor C42. When gate B63 is opened, gate C41 is opened synchronously, so that the granular silicon in the hopper 61 will be thrown directly downward. Only after gate C41 is closed can gate A52 be opened to ensure that the temporary storage box 40 is always in a closed state and that the cyclone separator 20 can continue to separate. In this embodiment, the door motor C42 adopts a double-headed setting, which synchronously drives the two double-headed screws to rotate. There are two gates C41, which are screwed to the screws, so that gate C41 can be opened and closed horizontally, thereby achieving a large-scale and highly airtight switching effect. It should be noted that when the upper chamber is opened, the space increases instantly, which will back-suck the gas and dust in the cyclone separator 20. Therefore, the two chambers are connected by a balancing valve 70. After gate C41 is closed and before gate A52 is opened, the balancing valve 70 is turned on, and the airflow in the upper chamber flows to the lower chamber through the balancing valve 70, so that the air pressure in the two chambers is gradually balanced, which can effectively reduce the back-sucking phenomenon when gate A52 is opened.

[0041] The working principle of the closed granular silicon feeding device is as follows: during normal transportation, the air compressor 11 passes nitrogen through the reversing valve A15 high-speed Venturi mixer 14, and uses negative pressure to suck in granular silicon, forming a gas-solid two-phase flow, which enters the cyclone separator 20. Here, the centrifugal force of the spiral injects the gas and dust into the filter box 31, and the dust is filtered by the filter 32. The gas passes through the filter 32 upward and returns to the air compressor 11 from the exhaust pipe 33, thus realizing a closed cycle of nitrogen. , thereby reducing the loss of nitrogen, the granular silicon falls from the solid outlet of the cyclone separator 20, falls on the spherical convex, is broken up, and then falls along the dispersion plate 51, so that the granular silicon contacts the dispersion plate 51, transfers the static electricity to the dispersion plate 51, and achieves the effect of static elimination. The granular silicon falls along the opened gate A52 onto the perforated plate 55, and falls along the perforated plate 55 for secondary static elimination. The holes can increase the contact between the granular silicon and the perforated plate 55, thereby further improving the static elimination effect. The granular silicon falls into the hopper 61 and is weighed. After weighing, the gate A52 is closed. The granular silicon falling from the cyclone separator 20 will be temporarily stored on the dispersion plate 51. At the same time, the sealing of the solid outlet of the cyclone separator 20 is ensured until the gate B63 and the gate C41 are opened to discharge the weighed material. Then the gate A52 is opened and the granular silicon continues to fall into the hopper 61 and is continued to be weighed, realizing quantitative feeding. After the gate C41 is closed, the balancing valve 70 is opened first to restore the upper and lower chambers. The balance is then maintained, and then the gate A52 is opened. This can effectively alleviate the phenomenon of airflow backflow when the gate A52 is opened. In summary, the air compressor 11 outputs high-speed nitrogen carrying granular silicon to the cyclone separator 20, and the gas carrying dust enters the dust removal mechanism 30 and then returns to the air compressor 11 to realize nitrogen circulation. The two chambers of the temporary storage box 40 are opened alternately to remove static electricity and weigh the granular silicon, and ensure the closure of the solid outlet of the cyclone separator 20 and the quantitative discharge of granular silicon.

[0042] It should be noted that the air compressor 11, air supply valve, reversing valve A15, reversing valve B16, dust removal motor 35, door motor C42, door motor A53, gate B63, door motor B64, balancing valve 70 and sensor 62 in this application are all controlled by a PLC controller. The PLC can adopt the Siemens S7-1200 series and be equipped with a touch screen for parameter settings such as weighing threshold, backwash cycle and status monitoring.

[0043] The above-mentioned electrical equipment and power supply control equipment are common components in the field of industrial automation. Their selection, installation and programming methods are common knowledge among technical personnel in this field. This application does not need to elaborate on their specific implementation details, but only needs to clarify their functional relationship in the system.

[0044] The above are merely examples of the present application and are not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, improvements, or equivalent replacements made within the spirit and principles of the present application shall be included in the scope of protection of the present application. It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures.

Claims

1. A closed granular silicon feeding device, characterized in that: The invention relates to a pneumatic conveying mechanism (10), wherein a cyclone separator (20) is provided at the end of the conveying mechanism (10), and a dust removal mechanism (30) is provided at the gas outlet of the cyclone separator (20). The conveying mechanism (10) comprises an air compressor (11), wherein an air outlet (12) and an air suction port (13) are provided on the air compressor (11), and the air outlet of the dust removal mechanism (30) is conditionally connected to the air suction port (13). The solid outlet of the cyclone separator (20) is provided with a temporary storage box (40), and the temporary storage box (40) is provided with two commutable chambers in sequence from top to bottom, and a static electricity removal mechanism (50) and a weighing mechanism (60) are respectively provided in the two chambers. The temporary storage box (40) is provided with a balancing valve (70), and the two ends of the balancing valve (70) are respectively connected to the two chambers.

2. A closed granular silicon feeding device according to claim 1, characterized in that: The dust removal mechanism (30) comprises a filter box (31), the filter box (31) is fixedly connected to the gas outlet of the cyclone separator (20), a filter screen (32) is provided in the filter box (31), and an exhaust pipe (33) is provided on the filter box (31).

3. A closed granular silicon feeding device according to claim 2, characterized in that: The filter screen (32) is plugged into the filter box (31), and the filter screen (32) is screwed to the filter box (31).

4. A closed granular silicon feeding device according to claim 3, characterized in that: A dust discharge pipe (34) is provided at the lower end of the filter box (31), and valves (37) are provided on the dust discharge pipe (34) and the gas outlet of the cyclone separator (20). A dust removal motor (35) is provided on one side of the filter box (31), and a rotating shaft (36) is fixedly connected to the output end of the dust removal motor (35), and the two valves (37) are fixedly connected to the rotating shaft (36).

5. A closed granular silicon feeding device according to claim 4, characterized in that: The conveying mechanism (10) further includes a Venturi mixer (14), which is arranged at the air outlet (12), the outlet of the Venturi mixer (14) is connected to the air inlet of the cyclone separator (20), and the feed pipe of the Venturi mixer (14) is connected to the storage box of granular silicon.

6. A closed granular silicon feeding device according to claim 5, characterized in that: The conveying mechanism (10) further includes a reversing valve A (15) and a reversing valve B (16), wherein the air inlet of the reversing valve A (15) is communicated with the air outlet (12), one of the outlets of the reversing valve A (15) is communicated with the air inlet end of the venturi mixer (14), the other outlet of the reversing valve A (15) is communicated with one of the outlets of the reversing valve B (16), the other outlet of the reversing valve B (16) is communicated with the air suction port (13), and the inlet of the reversing valve B (16) is communicated with the filter box (31).

7. A closed granular silicon feeding device according to claim 6, characterized in that: The static electricity removal mechanism (50) includes a grounded dispersion plate (51), the dispersion plate (51) is fixedly connected to the inner wall of the temporary storage box (40), the dispersion plate (51) is provided with a spherical protrusion facing the solid outlet of the cyclone separator (20), a gate A (52) is provided on one side of the dispersion plate (51), the gate A (52) is hinged to the inner wall of the temporary storage box (40), the gate A (52) is in contact with the dispersion plate (51), and the gate A (52) is powered by a door motor A (53).

8. The closed granular silicon feeding device according to claim 7, characterized in that: A suspension rod (54) is fixedly connected below the dispersion plate (51), and a perforated plate (55) is fixedly connected below the suspension rod (54).

9. The closed granular silicon feeding device according to claim 8, characterized in that: The weighing mechanism (60) includes a hopper (61) and a sensor (62). The sensor (62) is installed on the bottom wall of the temporary storage box (40). The hopper (61) is installed on the sensor (62). The hopper (61) is located below the perforated plate (55). A gate B (63) is provided at the bottom of the temporary storage box (40). The gate B (63) is connected to a door motor B (64) for power.

10. The closed granular silicon feeding device according to claim 9, characterized in that: A gate C (41) is provided below the temporary storage box (40) and corresponds to the gate B (63). The gate C (41) is connected to a door motor C (42) for power.

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