A device for rapidly crushing bulk silicon-magnesium alloy

Abstract

The invention discloses a device for rapidly crushing blocky silicon-magnesium alloy, and relates to the technical field of silicon-magnesium alloy. The device comprises a steel platform and an inclined ladder, and comprises a silo arranged above the steel platform, a material barrel is arranged on the side of the silo, a flexible connection is arranged at the bottom of the silo, a vibrating feeder is arranged at the bottom of the flexible connection, a flexible connection is arranged at the bottom of the vibrating feeder, a double-layer roller machine is arranged at the bottom of the flexible connection, a star feeder is arranged at the bottom of the double-layer roller machine, a discharge hose is arranged at the bottom of the star feeder, a plurality of oxygen detectors are arranged on the double-layer roller machine, a plurality of flame detectors are arranged on the double-layer roller machine, a nitrogen discharge port is arranged near the bottom of the double-layer roller machine, a pressure relief component is arranged on the double-layer roller machine, a nitrogen inlet of a roller feeding silo is arranged at the top of the double-layer roller machine, a pressure transmitter is arranged at the top of the double-layer roller machine, and a blasting baffle is arranged on the steel platform.

Description

Technical Field

[0001] The invention relates to the technical field of silicon-magnesium alloys, in particular to a device for rapidly crushing blocky silicon-magnesium alloys. Background Art

[0002] The Komatsu method for synthesizing silane and disilane requires the preparation of silicon-magnesium alloy first. The preparation of silicon-magnesium alloy is to put the evenly mixed silicon powder and magnesium powder into a fixed bed vacuum furnace tank, and heat and react in a well-type heating furnace to produce silicon-magnesium alloy. After the reaction, the alloy in the vacuum furnace tank is in a whole block. The whole block of material in the furnace tank is first broken into small pieces by hand and taken out. The block silicon-magnesium alloy is then broken into fine particles ≥8 mesh by hand to meet the conditions for use.

[0003] The search publication number is: CN209076841U. A silicon-magnesium alloy dust-proof crushing and screening device comprises a device shell, a No. 1 screen is arranged on the top of the device shell, the No. 1 screen is clamped with the device shell, a motor is connected to one side of the device shell, the motor and the device shell are fixedly connected by bolts, the output end of the motor passes through the inner wall of the device shell and is rotatably connected with the inner wall of the device shell, the output end of the motor located inside the device shell is connected with a cutting barrel, the motor is arranged to drive the rotating rod to rotate, and the rotating rod drives the cutting knife to roll the magnesium alloy to crush, and after the crushing is completed, the smaller particles fall from the No. 2 screen into the receiving box, and the bottom of the receiving box has an inclined surface inclined to the discharge pipe to facilitate the discharge, and the fan is turned on for discharge. If there are larger crushed materials blocking the discharge on the No. 2 screen, it is necessary to control the fan to rotate in the opposite direction to blow up the material and crush it again. The No. 1 screen can ventilate and block the material, so as to prevent the material from overflowing the device, thereby achieving the dust-proof effect, integrating crushing and screening, and improving the work efficiency.

[0004] However, in the prior art, the process of crushing small pieces of silicon-magnesium alloy into powder particles requires a lot of work and is inefficient, and magnesium silicide is flammable. Fine powder easily accumulates during manual crushing and screening, reaching the dust explosion limit, and is easily ignited by static electricity, which then causes a loud explosion, posing a huge safety risk. Summary of the invention

[0005] The purpose of the present invention is to provide a device for rapidly crushing bulk silicon-magnesium alloy to solve the deficiencies in the above-mentioned prior art.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical scheme: comprising a steel platform and an inclined ladder, comprising a silo arranged above the steel platform, a material barrel being arranged on the side of the silo, a soft connection being arranged at the bottom of the silo, a vibrating feeder being arranged at the bottom of the soft connection, a soft connection being arranged at the bottom of the vibrating feeder, a double-layer roller machine being arranged at the bottom of the soft connection, a star feeder being arranged at the bottom of the double-layer roller machine, a discharge hose being arranged at the bottom of the star feeder, a plurality of oxygen detectors being arranged on the double-layer roller machine, a plurality of flame detectors being arranged on the double-layer roller machine, a nitrogen discharge port being arranged near the bottom of the double-layer roller machine, a pressure relief assembly being arranged on the double-layer roller machine, a nitrogen inlet of a roller feed silo being arranged at the top of the double-layer roller machine, a pressure transmitter being arranged at the top of the double-layer roller machine, and a blasting baffle being arranged on the steel platform.

[0007] Furthermore, a silo nitrogen inlet is provided at the top of the silo, and a dust removal port is provided at the top of the silo nitrogen inlet.

[0008] Furthermore, the pressure relief assembly includes a fixing unit, and the fixing unit is arranged on a tube body on the double-layer roller machine, and a fixing ring is sleeved on the tube body.

[0009] Furthermore, the pressure relief assembly also includes a connecting unit, and the connecting unit includes a sleeve that can be sleeved with the pipe body.

[0010] Furthermore, a first spring telescopic member is arranged in the sleeve, an output section of the first spring telescopic member is provided with an arc surface, and a side of the first spring telescopic member away from the arc surface is in contact with the fixing ring.

[0011] Furthermore, the connecting unit also includes a second spring telescopic member arranged in the sleeve, the output end of the second spring telescopic member is provided with an arc surface, and the side of the output end of the second spring telescopic member away from the arc surface is provided with a notch.

[0012] Furthermore, the connecting unit also includes a plurality of third spring expansion and contraction members arranged in the sleeve, and annular members are arranged at output ends of the plurality of third spring expansion and contraction members.

[0013] Furthermore, the connection unit also includes a bursting piece attached to the circular ring away from the third spring expansion member, and a side of the bursting piece away from the circular ring is attached to a notch at the output end of the second spring expansion member.

[0014] Furthermore, the connecting unit also includes a clamping rod arranged on the side of the circular ring away from the bursting disc, and the connecting unit also includes a torsion spring arranged in the sleeve. A rotating rod is provided at the output end of the torsion spring, and a clamping groove is opened on the side of the rotating rod, and the clamping groove can be clamped with the clamping rod.

[0015] Furthermore, the connection unit also includes a first wire with one end fixedly connected to the rotating rod, the other end of the first wire is fixedly connected to the output end of the first spring telescopic member, and a windshield is provided at the bottom of the rotating rod.

[0016] In the above technical scheme, the present invention provides a device for quickly crushing bulk silicon-magnesium alloy. The entire crushing process is carried out under nitrogen protection. At the same time, the continuously flowing nitrogen can take away the heat of the double-layer roller machine during the extrusion process to avoid heat accumulation and combustion. At the same time, a flame detector is added to automatically interlock with the PLC. Once the flame detector detects a spark, all moving devices automatically stop to reduce the dust concentration inside the double-layer roller machine, increase the amount of nitrogen entering, reduce the concentration of the combustion-supporting material, and extinguish the combustion material. At the same time, the PLC automatic program will also display the pressure transmitter of the system. The nitrogen intake and discharge volume are automatically adjusted according to the pressure indicated to ensure that the blasting disc will not rupture due to high pressure. If the double-layer roller mill burns violently during the crushing process and the internal pressure of the device rises rapidly, when it exceeds the blasting pressure of the blasting disc, the blasting disc will automatically rupture and release the internal pressure of the double-layer roller mill to ensure that the device operates under low oxygen concentration and will not spontaneously combust, reducing safety risks. Even if all control measures fail, the blasting disc will rupture and release pressure to ensure that the device will not explode. At the same time, the blasting baffle will block the ruptured blasting disc fragments to prevent them from splashing and injuring people during the rupture process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 One of the overall structural diagrams provided by the embodiment of the present invention;

[0019] Figure 2 The second schematic diagram of the overall structure provided by the embodiment of the present invention;

[0020] Figure 3 One of the partial structural schematic diagrams provided for an embodiment of the present invention;

[0021] Figure 4 A second schematic diagram of a portion of the structure provided in an embodiment of the present invention;

[0022] Figure 5 Partial structural diagram of the third embodiment of the present invention;

[0023] Figure 6A partial structural cross-sectional schematic diagram provided for an embodiment of the present invention.

[0024] Description of reference numerals:

[0025] 1. Inclined ladder; 2. Blasting baffle; 3. Flexible connection; 4. Vibrating feeder; 5. Nitrogen inlet of silo; 6. Dust removal port; 7. Silo; 8. Material barrel; 9. Steel platform; 10. Double-layer roller machine; 11. Star feeder; 12. Discharge hose; 14. Oxygen detector; 15. Flame detector; 16. Nitrogen discharge port; 17. Pressure relief assembly; 171. Fixed unit; 1711. Pipe body; 1712 , fixing ring; 172, connecting unit; 1721, sleeve; 1722, first spring expansion member; 1723, second spring expansion member; 1724, third spring expansion member; 1725, circular ring member; 1726, bursting disc; 1727, clamping rod; 1729, rotating rod; 17210, first wire; 17211, wind shield; 18, nitrogen inlet of roller feed bin; 19, pressure transmitter. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] See also Figure 1-6 The embodiment of the present invention provides a device for rapidly crushing bulk silicon-magnesium alloy, comprising a steel platform 9 and an inclined ladder 1, comprising a silo 7 arranged above the steel platform 9, a material bucket 8 arranged on the side of the silo 7, a flexible connection 3 arranged at the bottom of the silo 7, a vibrating feeder 4 arranged at the bottom of the flexible connection 3, a flexible connection 3 arranged at the bottom of the vibrating feeder 4, a double-layer roller machine 10 arranged at the bottom of the flexible connection 3, a star feeder 11 arranged at the bottom of the double-layer roller machine 10, a discharge hose 12 arranged at the bottom of the star feeder 11, a plurality of oxygen detectors 14 arranged on the double-layer roller machine 10, a plurality of flame detectors 15 arranged on the double-layer roller machine 10, and a plurality of flame detectors 16 arranged on the double-layer roller machine 10. A nitrogen discharge port 16 is arranged near the bottom, a pressure relief component 17 is arranged on the double-layer roller machine 10, a roller feed bin nitrogen inlet 18 is arranged on the top of the double-layer roller machine 10, a pressure transmitter 19 is arranged on the top of the double-layer roller machine 10, and a bursting baffle 2 is arranged on the steel platform 9. If the double-layer roller machine 10 burns violently during the crushing process, the internal pressure of the device rises rapidly. When it exceeds the bursting pressure of the bursting disc 1726 in the pressure relief component 17, the bursting disc 1726 automatically ruptures and releases the internal pressure of the double-layer roller machine 10. At the same time, the bursting baffle 2 will block the broken fragments of the bursting disc 1726 to prevent random splashing and injuring people during the rupture process.

[0028] Preferably, a silo nitrogen inlet 5 is provided at the top of the silo 7 , and a dust removal port 6 is provided at the top of the silo nitrogen inlet 5 .

[0029] Preferably, the pressure relief assembly 17 includes a fixing unit 171, which is arranged on a tube body 1711 on the double-layer roller machine 10. A fixing ring 1712 is sleeved on the tube body 1711. The tube body 1711 is connected to the inside of the double-layer roller machine 10 so that the internal pressure of the double-layer roller machine 10 can be discharged by the tube body 1711. At the same time, the setting of the fixing ring 1712 facilitates the connection with the connecting unit 172.

[0030] Preferably, the pressure relief assembly 17 also includes a connecting unit 172, which includes a sleeve 1721 that can be socketed with the tube body 1711. The sleeve 1721 can facilitate the installation of other accessories and protect the bursting piece 1726. If the bursting piece 1726 is abnormally broken during the operation of the device, it may cause the magnesium-aluminum alloy powder inside the double-layer roller machine 10 to float out and contact with the air, causing explosion or combustion. The setting of the second sleeve 1721 can prevent the bursting piece 1726 from being broken by external impact, thereby eliminating safety hazards.

[0031] Preferably, a first spring telescopic member 1722 is provided in the sleeve 1721, and an output section of the first spring telescopic member 1722 is provided with an arc surface, and a side of the first spring telescopic member 1722 away from the arc surface is in contact with the fixing ring 1712. The first spring telescopic member 1722 is configured so that when the output end of the first spring telescopic member 1722 contacts with the fixing ring 1712, it contracts, and when the output end of the first spring telescopic member 1722 is no longer in contact with the fixing ring 1712, the first spring telescopic member 1722 pops out, and the fixing ring 1712 is clamped by the interval between the sleeve 1721 and the first spring telescopic member 1722, so as to achieve the effect of quick installation.

[0032] Preferably, the connecting unit 172 also includes a second spring expansion member 1723 arranged in the sleeve 1721, and the output end of the second spring expansion member 1723 is provided with an arc surface, and a notch is provided on the side of the output end of the second spring expansion member 1723 away from the arc surface. The arrangement of the second spring expansion member 1723 allows the bursting piece 1726 to be ejected from the installation position in the clamped area when the bursting piece 1726 is broken due to the incomplete shape of the bursting piece 1726, thereby preventing part of the bursting piece 1726 from remaining at the installation position, thereby preventing the bursting piece 1726 from being ejected again and causing harm to the surrounding personnel after the surrounding personnel relax their vigilance.

[0033] Preferably, the connecting unit 172 also includes a plurality of third spring expansion members 1724 arranged in the sleeve 1721, and a circular ring member 1725 is arranged at the output end of the plurality of third spring expansion members 1724. The arrangement of the circular ring member 1725 enables the bursting piece 1726 to fit tightly with the sleeve 1721, so that the bursting piece 1726 can remain stable after installation.

[0034] Preferably, the connecting unit 172 also includes a bursting piece 1726 that is attached to the circular ring member 1725 away from the third spring expansion member 1724, and the side of the bursting piece 1726 away from the circular ring member 1725 is attached to the notch at the output end of the second spring expansion member 1723. The bursting piece 1726 makes it possible to quickly relieve the pressure inside the device when combustion occurs inside the device and a large amount of nitrogen is introduced and the pressure surges, thereby preventing the internal pressure of the device from being too high, causing damage to the device or causing a safety accident.

[0035] Preferably, the connecting unit 172 also includes a clamping rod 1727 arranged on the side of the circular ring 1725 away from the bursting piece 1726, and the connecting unit 172 also includes a torsion spring arranged in the sleeve 1721, and a rotating rod 1729 is arranged at the output end of the torsion spring, and a clamping groove is opened on the side of the rotating rod 1729, and the clamping groove can be clamped with the clamping rod 1727. The setting of the clamping rod 1727 can prevent the sleeve 1721 from falling off when the non-burst piece 1726 is broken.

[0036] Preferably, the connecting unit 172 also includes a first wire 17210 having one end fixedly connected to the rotating rod 1729, and the other end of the first wire 17210 is fixedly connected to the output end of the first spring telescopic member 1722. A baffle is provided at the bottom of the rotating rod 1729. The wind shield 17211 can drive the rotating rod 1729 to rotate under the wind pressure after the bursting piece 1726 is broken, so as to drive the first spring telescopic rod to contract, and make the connecting unit 172 fall off quickly under the action of wind pressure.

[0037] Working principle: The barrel 8 containing the block silicon-magnesium alloy is hoisted to the steel platform 9 by a crane. The operator reaches the steel platform 9 through the inclined ladder 1, opens the door of the silo 7, opens the valve on the dust removal pipeline connected to the dust removal port 6, manually adjusts the height of the crane, and dumps the block silicon-magnesium alloy material in the barrel 8 into the silo 7. The empty barrel 8 is hoisted to the bottom of the steel platform 9, and then the door of the silo 7 is closed, and finally the valve on the dust removal pipeline connected to the dust removal port 6 is closed; an empty barrel 8 is placed directly below the discharge hose 12 and clamped with an electrostatic clamp (make sure the electrostatic clamp is in an effective state), first open the nitrogen discharge port 16, then open the nitrogen inlet 5 of the silo and the nitrogen inlet of the feed port of the double-layer roller machine 10, and replace the entire crushing system with nitrogen. When the oxygen concentration detection values ​​of the upper, middle and lower three oxygen detectors 14 of the double-layer roller machine 10 are all ≤3%, the oxygen concentration sound and light alarm is eliminated, and the vibration feeder 4, the double-layer roller machine 10, and the star feeder 11 are ready for starting;

[0038] Turn on the main power of the PLC control box, and after all programs have started, click to enter the operation interface. First, click the start button of the star feeder 11. After the star feeder 11 is running normally, click the double-layer roller machine 10 button. After the double-layer roller machine 10 is running normally, click the vibration feeder 4 button to start the vibration feeder 4. The block materials in the silo 7 enter the double-layer roller machine 10 through the vibration feeder 4 and the two soft connections 3 to start crushing. The crushed powder is evenly transported to the receiving barrel 8 through the star feeder 11. The powder material coming out of the discharge hose 12 is screened and tested. If it does not meet the requirements, adjust the roller spacing of the double-layer roller machine 10 until the material is directly crushed to the required particle size;

[0039] The entire crushing process is carried out under the protection of nitrogen. At the same time, the continuous flow of nitrogen can take away the heat of the extrusion process of the double-layer roller machine 10 to prevent heat accumulation from causing combustion. At the same time, the flame detector 15 is added to automatically interlock with the PLC. Once the flame detector 15 detects a spark, all moving devices automatically stop, reducing the dust concentration inside the double-layer roller machine 10, increasing the amount of nitrogen entering, reducing the concentration of the combustion-supporting material, and extinguishing the combustion material. At the same time, the PLC automatic program will automatically adjust the amount of nitrogen entering and discharging according to the pressure displayed by the system pressure transmitter 19 to ensure that the bursting disc 1726 will not rupture due to high pressure. If the double-layer roller machine 10 burns violently during the crushing process, the internal pressure of the device rises rapidly. When it exceeds the bursting pressure of the bursting disc 1726, the bursting disc 1726 automatically ruptures and releases the internal pressure of the double-layer roller machine 10. At the same time, the bursting baffle 2 will block the broken fragments of the bursting disc 1726 to prevent random splashing and injuring people during the rupture process.

[0040] When the bursting piece 1726 is broken, since most of the bursting piece 1726 disappears, the remaining edge of the bursting piece 1726 is pressed out to the pressure relief wind receiving area under the elastic potential energy of the second spring telescopic member 1723, so that the bursting piece 1726 is completely and completely blown out of the sleeve 1721 in the pressure relief of the device. Afterwards, due to the disappearance of the bursting piece 1726, several third spring telescopic members 1724 are released, driving the circular ring member 1725 to move, so that the clamping rod 1727 moves, and the clamping rod 1727 and the rotating rod 1729 are released. At this time, the rotating rod 1729 can rotate, and at the same time, under the blowing of the pressure relief wind force, the bursting piece 1726 is completely blown out of the sleeve 1721 in the pressure relief of the device. Under the action of the windshield 17211, the windshield plate 17211 drives the rotating rod 1729 to rotate. When the rotating rod 1729 rotates, the first wire 17210 is reeled up, so that the other end of the first wire 17210 pulls the first spring expansion member 1722 to contract, so that the first spring expansion member 1722 is no longer closely connected with the fixing ring 1712, so that the sleeve 1721 falls off under the pressure release wind force, so that the bursting disc 1726 can be completely separated from the pressure release position at one time when it is broken, so as to prevent the bursting disc 1726 from remaining in the installation position, and to avoid the bursting disc 1726 fragments from being ejected again after the surrounding personnel relax their vigilance to cause harm to the surrounding personnel;

[0041] When a new bursting disc 1726 needs to be installed, the bursting disc 1726 only needs to be pressed into the sleeve 1721. The bursting disc 1726 first contacts the first spring telescopic member 1722 to cause the first spring telescopic member 1722 to contract, so that the first spring telescopic member 1722 will not affect the movement of the bursting disc 1726. Then, the bursting disc 1726 continues to move and contacts the second spring telescopic member 1723 to cause the second spring telescopic member 1723 to contract, so that the setting of the second spring telescopic member 1723 will not affect the movement of the bursting disc 1726. Then, the bursting disc 1726 enters the notch position of the second spring telescopic member 1723, so that the annular member 1725 abuts against the bursting disc 1726, and the blasting is completed. The piece 1726 is installed in the sleeve 1721, and then the sleeve 1721 is sleeved on the tube body 1711, so that the fixing ring 1712 is in contact with the first spring telescopic member 1722, and the first spring telescopic member 1722 is telescoped until the first spring telescopic member 1722 is no longer in contact with the fixing ring 1712, so that the first spring telescopic member 1722 is released, and the sleeve 1721 and the tube body 1711 are connected to each other, thereby completing the installation of the new bursting piece 1726, so that the bursting piece 1726 can be quickly replaced and installed. At the same time, the sleeve 1721 can protect the bursting piece 1726 from the outside to prevent the bursting piece 1726 from being broken by external impact, thereby eliminating safety hazards.

[0042] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A device for rapidly crushing bulk silicon-magnesium alloy, comprising a steel platform (9) and an inclined ladder (1), characterized in that: The invention comprises a silo (7) arranged above the steel platform (9), a material bucket (8) being arranged on the side of the silo (7), a flexible connection (3) being arranged at the bottom of the silo (7), a vibrating feeder (4) being arranged at the bottom of the flexible connection (3), a flexible connection (3) being arranged at the bottom of the vibrating feeder (4), a double-layer roller machine (10) being arranged at the bottom of the double-layer roller machine (10), a star feeder (11) being arranged at the bottom of the star feeder (11), a discharge hose (12) being arranged at the bottom of the double-layer roller machine (10), and a discharge hose (12) being arranged at the bottom of the star feeder (11). The roller machine (10) is provided with a plurality of oxygen detectors (14), the double-layer roller machine (10) is provided with a plurality of flame detectors (15), a nitrogen discharge port (16) is provided near the bottom of the double-layer roller machine (10), a pressure relief assembly (17) is provided on the double-layer roller machine (10), a roller feed bin nitrogen inlet is provided at the top of the double-layer roller machine (10), a pressure transmitter (19) is provided at the top of the double-layer roller machine (10), and a blasting baffle (2) is provided on the steel platform (9); The pressure relief assembly (17) comprises a fixing unit (171), wherein the fixing unit (171) is arranged on a tube body (1711) on the double-layer roller machine (10), and a fixing ring (1712) is sleeved on the tube body (1711); The pressure relief assembly (17) further comprises a connection unit (172), wherein the connection unit (172) comprises a sleeve (1721) capable of being sleeved with the tube body (1711); A first spring expansion member (1722) is arranged in the sleeve (1721); an output section of the first spring expansion member (1722) is provided with an arc surface; and a side of the first spring expansion member (1722) away from the arc surface is in contact with the fixing ring (1712); The connecting unit (172) further comprises a second spring expansion member (1723) arranged in the sleeve (1721), the output end of the second spring expansion member (1723) being provided with an arc surface, and a notch being provided on a side of the output end of the second spring expansion member (1723) away from the arc surface; The connecting unit (172) further comprises a plurality of third spring expansion and contraction members (1724) arranged in the sleeve (1721), and a circular ring member (1725) is arranged at the output end of the plurality of third spring expansion and contraction members (1724); The connecting unit (172) further comprises a bursting piece (1726) affixed to the circular ring (1725) away from the third spring expansion piece (1724), and a side of the bursting piece (1726) away from the circular ring (1725) affixes to a notch at the output end of the second spring expansion piece (1723); The connecting unit (172) further comprises a clamping rod (1727) arranged on a side of the circular ring (1725) away from the bursting disc (1726), and the connecting unit (172) further comprises a torsion spring arranged in the sleeve (1721), a rotating rod (1729) being arranged at an output end of the torsion spring, and a clamping groove is provided on a side of the rotating rod (1729), and the clamping groove can be clamped with the clamping rod (1727); The connecting unit (172) further comprises a first wire (17210) having one end fixedly connected to the rotating rod (1729), the other end of the first wire (17210) being fixedly connected to the output end of the first spring expansion member (1722), and a windshield plate (17211) being arranged at the bottom of the rotating rod (1729).

2. The device for rapidly crushing bulk silicon-magnesium alloy according to claim 1, characterized in that: A silo nitrogen inlet (5) is provided at the top of the silo (7), and a dust removal port (6) is provided at the top of the silo nitrogen inlet (5).

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