Automatic discharging control device suitable for superfine powder

Abstract

The automatic discharging control device comprises a discharging unit and a dust removal unit, the discharging unit comprises a powder bin, a pneumatic gate valve, a buffer exhaust bin, a pneumatic butterfly valve and a filling bin which are connected in sequence, and the dust removal unit comprises a dust remover, a tail gas dust collector and a dust removal fan which are connected in sequence. According to the device, superfine powder materials which are light in weight, strong in adhesion and poor in flowability are solved, the structure is simple, the one-time investment cost is low, the discharging control equipment is utilized, and the device is convenient to operate, high in practicability and easy to popularize and use. A control target is achieved by utilizing a specific control mode, and the purposes of efficient filling and stable filling weight of the configured pneumatic filling machine are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical engineering, in particular to an automatic blanking control device and method for ultrafine powder of organic polymer. Background Technique

[0002] Ultra-fine, light and viscous powders have poor fluidity, are difficult to blank by gravity, are easy to agglomerate under force extrusion, are prone to bridging, resulting in blanking interruption, affecting filling efficiency and stability, and also causing product quality fluctuations. Traditional technical methods use a variety of methods such as quantitative feeders, fluidization-assisted blowing, and percussion hammers in cooperation to continuously increase the fluidity of the powder. These methods have high equipment investment, high failure rates, and large powder leakage, affecting the continuity of filling, and the agglomerated materials also affect the filling accuracy.

[0003] The filling method of organic polymer powder is screw conveying and mechanical filling. Due to the poor blanking of the buffer exhaust bin, the amount of polymer powder falling into the screw blade in the filling bin is uneven, resulting in unqualified bag weights of the packaging bags. And during the long-term operation of the screw blade, due to mechanical extrusion or the increase of the inner surface temperature of the equipment during long-term operation and friction to generate plasticized substances, and the high degree of extrusion and compaction to form hard particles, which are mixed into the product and affect the resin quality.

[0004] According to the requirements of the occupational exposure limit of polyvinyl chloride dust, the maximum allowable concentration of inhalable dust in the workplace is 10 mg / m 3 3, and the time-weighted average allowable concentration is 5 mg / m 3 3. The dust content in the gas discharged from the buffer exhaust bin is high, and the operating environment of employees is poor. Working in this environment for a long time poses a serious threat to the health of employees. The paste resin dust is extremely easy to adhere to the surface of the equipment, resulting in poor heat dissipation of the equipment and high equipment maintenance rate.

[0005] The utility model patent CN216856648U discloses an anti-blocking lithium salt powder blanking device. By setting a pressurizing mechanism on the transition bin, the pressure inside the transition bin can be conveniently adjusted to make the pressure inside the transition bin greater than the pressure inside the reaction kettle, preventing the acid gas in the reaction kettle from flowing back. At the same time, a first control mechanism is provided on the first connecting pipe fitting to ensure that after the blanking of the transition bin is completed, the first connecting pipe fitting is closed to prevent the acid gas in the reaction kettle from flowing back. However, pressurizing the transition bin causes the lithium salt powder to bridge in the transition bin, and the blanking of the lithium salt powder in the transition bin is not smooth. In addition, the pressurized lithium salt powder entering the reaction kettle will increase the pressure of the reaction kettle, which is not conducive to the reaction in the kettle. Summary of the Invention

[0006] The purpose of the present utility model is to solve the problems of an ultrafine powder material that is light in weight, has strong adhesiveness, and poor fluidity. After being transported into a storage bin by negative pressure, positive pressure, or normal pressure, it can automatically discharge materials, simultaneously meet the continuous filling requirements of multiple filling machines, and achieve the goals of efficient filling and stable filling weight of the configured pneumatic filling machine.

[0007] The technical solution adopted by the present utility model to solve its technical problems is as follows: It includes a blanking unit and a dust removal unit. The blanking unit includes a powder bin, a pneumatic slide valve, a buffer exhaust bin, a pneumatic butterfly valve, and a filling bin connected in sequence. The dust removal unit includes a dust collector, a tail gas dust collector, and a dust removal fan connected in sequence. One side of the top of the buffer exhaust bin is provided with a cloth bag breathing cap, and the other side is provided with a dust removal port. The dust collector is a detachable cylindrical cloth bag type filter, installed above the dust removal port. The dust collector is provided with a 100 - 125 mm cylindrical filter element and a matching keel. The upper side of the dust collector is provided with a pulse pipeline, and the pulse pipeline extends into the dust collector. The pulse pipeline is connected to a compressed air tank through a solenoid valve, and the solenoid valve is connected to an anti-blow controller through an electrical signal.

[0008] Further, the powder contained in the powder bin is an ultrafine powder with a particle size of 0.1 - 40 μm, 0.3 - 0.4 m 3 / t, and is an easily adhesive ultrafine powder. A vibrating feeder with a diameter of 1200 - 1700 mm is provided at the lower part of the powder bin. The vibrating feeder is provided with at least two symmetric vibrators and is connected to a pneumatic slide valve with a diameter of 400 - 600 mm at the lower part. The opening degree of the slide valve can be controlled by a limit. The rotation of the eccentric wheel is driven by low-power electric energy to generate resonance to break the bridge in the resin bin.

[0009] Further, the upper part of the buffer exhaust bin is an oblong cylinder with a height of 600 mm - 1000 mm and a diameter of 800 mm - 1200 mm. A pressure gauge is installed at the top, and 1 - 4 conical hoppers are connected at the lower part. The cone angle of the conical hopper is 60° - 75°. Each conical hopper is provided with a circular blanking port with a diameter of 200 - 300 mm at the bottom. Each independent blanking port is provided with a pneumatic butterfly valve to communicate with the filling bin. By using multiple conical hoppers to connect to the filling bin for feeding respectively, continuous packaging can be realized, and the packaging efficiency can be improved.

[0010] Further, a buffer exhaust bin level gauge is set 500 - 800 mm above the center position of each independent blanking port. The buffer exhaust bin level gauge, the pneumatic slide valve, and the vibrator are connected by electrical signals, and interlock control is realized through a PLC to stably control the level of the buffer exhaust bin, so that the residual pressure in the filling bin breaks the bridge in the buffer exhaust bin, without the need for an additional air flow arch breaking device, and at the same time meets the continuous material use requirements of the filling bin.

[0011] Further, the filling bin is provided with a sight glass and a filling bin level gauge. A fluidizer is provided at the bottom of the filling bin. Compressed air with a pressure of 0.03 - 0.08 MPa is conveyed to the filling bin through the fluidizer. When the filling hole is opened, the material boils and fluidizes in the feeding tank, and the material is filled. The filling weight control is stable. With a large space and negative pressure exhaust, the gas content in the material during the activation process is reduced, the volume of the filled material is controlled, and the filling stability of the packaging bag is improved.

[0012] Further, the filling bin level gauge and the pneumatic butterfly valve are interlocked and controlled through a PLC.

[0013] Further, the pulse pipeline is vertically inserted into the center of the filter element and is provided with multi-angle three-dimensional distributed air holes. The pressure of the compressed air in the compressed air tank is 0.3 - 0.4 MPa. The compressed air blows the powder on the filter element away from the filter through the pulse air holes, and the powder is recovered into the buffer exhaust bin.

[0014] The beneficial effects of the present utility model:

[0015] (1) In the present utility model, the buffer bin level gauge, the pneumatic slide valve, and the vibrator are electrically connected, and the pneumatic butterfly valve and the pressure bin level gauge are electrically connected. On the one hand, the degree of automation is improved, and the labor intensity of on-site operators is reduced. On the other hand, the production efficiency is improved, the continuity of production is enhanced, intermittent feeding of the resin bin is realized, continuous feeding of the buffer exhaust bin is realized, the exhaust efficiency is interlocked and controlled according to the filling rate, the residual pressure in the filling pressure bin breaks the bridge of the buffer exhaust bin, and no additional air flow arch-breaking device is required. Energy and resources are efficiently utilized, and the material caking caused by air pressure is avoided to reduce the feeding rate;

[0016] In the present utility model, a cloth bag breathing cap and a dust collector are provided. A filter and a pulse pipeline are provided in the dust collector. After the powder entrained in the discharged gas is filtered, it is recovered into the buffer exhaust bin. The discharged gas is clean and environmentally friendly, and the clean air meets the discharge standards. The bag weight stability rate: taking the annual output of 100,000 tons of paste resin as an example, the weight of each bag of paste resin drops from 25.05 - 25.45 kg to 25.15 - 25.35 kg, and the average weight of each bag drops by 0.1 kg / bag. The consumption of paste resin is reduced by 100000000÷25.35×0.1 = 394.47 tons;

[0017] In the present utility model, a vibrator is used. A low-power electric energy drives a rotating eccentric wheel to generate resonance to break the bridge of the resin bin. In addition, a cloth bag breathing cap and a dust collector are used to keep the pressure in the buffer exhaust bin at negative pressure and normal pressure, so that the residual pressure in the pressure bin breaks the bridge of the buffer exhaust bin, and no additional air flow arch-breaking device is required. Energy and resources are efficiently utilized;

[0018] Electric energy saving: The power of the screw conveyor is 3.7 KW, and the screw conveyor runs for 24 hours every day. Then the annual power saving for feeding is: 3.7×24×365 = 324120000 kWh / year. Brief Description of the Drawings

[0019] Figure 1 is a schematic diagram of the system of the present invention.

[0020] Figure 2 is Figure 1 a partial enlarged cross-sectional view of part A in

[0021] Figure 1-2 In , 1 is a powder bin, 2 is a pneumatic slide gate valve, 3 is a buffer exhaust bin, 4 is a pneumatic butterfly valve, 5 is a filling bin, 6 is a dust collector, 7 is a compressed air tank, 8 is a backflush controller, 9 is a tail gas dust collector, 10 is a dust removal fan, 11 is a cloth bag breathing cap, 12 is a dust removal port, 13 is a vibrating feeder, 14 is a vibrator, 15 is a buffer exhaust bin level gauge, 16 is a keel, 17 is a filter element, 18 is a pulse pipeline, 19 is a pore, 20 is a solenoid valve, 21 is a sight glass, 22 is a filling bin level gauge, 23 is a feeding tank, 24 is a fluidizer, 25 is a filling hole, 26 is a blanking port, 27 is a conical hopper, 28 is a cylinder, 29 is a pressure gauge, 30 is an adjustable air damper, and a is compressed air. Detailed Description of the Invention

[0022] Embodiment 1. An automatic blanking control device applicable to ultrafine powder, characterized in that: it includes a blanking unit and a dust removal unit. The blanking unit includes a powder bin 1, a pneumatic slide gate valve 2, a buffer exhaust bin 3, a pneumatic butterfly valve 4, and a filling bin 5 connected in sequence. The powder bin 1 contains powder with a particle size of 0.1 - 40 μm, 0.3 - 0.4 m 3 / t. The easily caking ultrafine powder, a vibrating feeder 13 with a 1200mm diameter is provided at the lower part of the powder bin 1. The vibrating feeder 13 is provided with at least two symmetric vibrators 14. The lower part is connected to a 400mm pneumatic slide valve 2. The pneumatic slide valve 2 can control the opening degree through limit. The upper part of the buffer exhaust bin 3 is an oblong cylinder 28 with a height of 600mm and a diameter of 800mm. A pressure gauge 29 is installed at the top. The lower part is connected to a conical hopper 27. The conical angle of the conical hopper 27 is 60°. A 200mm circular discharging port 26 is provided at the bottom of each conical hopper 27. A pneumatic butterfly valve 4 is provided at each independent discharging port 26 and communicated with the filling bin 5. A buffer exhaust bin level gauge 15 is arranged 500mm above the center position of each independent discharging port 26. The buffer exhaust bin level gauge 15, the pneumatic slide valve 2, and the vibrator 14 are electrically connected and interlocked through the PLC. The filling bin 5 is provided with a sight glass 21 and a filling bin level gauge 22. A fluidizer 24 is provided at the bottom of the filling bin 5. Compressed air with a pressure of 0.03MPa is conveyed to the filling bin through the fluidizer 24. The filling bin level gauge 22 and the pneumatic butterfly valve 4 are interlocked through the PLC; The dust removal unit includes a dust collector 6, a tail gas dust collector 9, and a dust removal fan 10 connected in sequence. A cloth bag breathing cap 11 is provided on one side of the top of the buffer exhaust bin, and a dust removal port 12 is provided on the other side. The dust collector 6 is a detachable cylindrical cloth bag filter installed above the dust removal port 12. A 100mm cylindrical filter element 17 and a matching keel 16 are provided inside the dust collector 6. A pulse pipeline 18 is provided on the side of the upper end of the dust collector 6 and the pulse pipeline 18 extends into the dust collector 6. The pulse pipeline 18 is vertically inserted into the center of the filter element 17 and provided with multi-angle three-dimensional distribution air holes 19. The pressure of the compressed air in the compressed air tank 7 is 0.3MPa and is connected to the pulse pipeline 18 through a solenoid valve 20. The solenoid valve 20 is electrically connected to the backflush controller 8.

[0023] An automatic blanking control method suitable for ultrafine powder includes the following steps:

[0024] (1) When the buffer exhaust bin level gauge 15 in the conical hopper 27 of the buffer exhaust bin 3 has no material, the buffer exhaust bin level gauge 15 outputs a no-material signal. After a 5s delay, the PLC outputs a signal to control the start of the vibrator 14 of the vibrating feeder 13. At the same time, it controls the pneumatic slide valve 2 to open to 15% valve position. The powder bin 1 starts to feed the buffer exhaust bin 3. After a 0s delay when all the buffer exhaust bin level gauges 15 show a high material level, the PLC gives a stop signal to the vibrator 14 and outputs a closing signal for the pneumatic slide valve 2 at the same time;

[0025] (2) The filling bin level gauge 22 outputs a no-material signal to the PLC. The PLC outputs a signal to open the pneumatic butterfly valve 4 for blanking of the corresponding filling bin 5. The filling bin 5 exhausts to the buffer exhaust bin 3, fluidizes the material and then feeds the filling bin 5. After the filling bin level gauge 22 outputs a signal indicating there is material, the PLC outputs a signal to close the corresponding pneumatic butterfly valve 4;

[0026] (3) The powder material in the powder silo 1 and the gas discharged from the filling silo 5 into the buffer exhaust silo 3 carry powder. After passing through the dust collector 6, the powder is filtered out and adsorbed on the outer side of the filter element 17. The gas passes through the filter holes of the filter element 17 and enters the tail gas dust collector 9 for secondary filtration. The clean tail gas is discharged through the dust removal fan 10;

[0027] (4) The backflush controller 8 outputs signals to switch the solenoid valve 20 at intervals of 5 s to control the backflush frequency of the compressed air on the filter element 17, and blows the powder adsorbed on the outer side of the filter element 17 back into the buffer exhaust silo 3;

[0028] (5) An adjustable air damper 30 is installed between the dust collector 6 and the tail gas dust collector 9 to control the normal pressure of the buffer exhaust silo 3 to be -0.1 kPa. When the pneumatic butterfly valve 4 is opened, the pressure in the buffer exhaust silo 3 is negative or normal pressure. The compressed air in the filling silo 5 enters the buffer exhaust silo 3 with a lower pressure to break the arch of the powder in the buffer exhaust silo 3. The compressed air is discharged into the atmosphere by the cloth bag breathing cap 11 or the dust collector 6. After the powder in the buffer exhaust silo 3 is broken arch, it enters the filling silo 5;

[0029] (6) When the pulse pipeline 18 is purged, the buffer exhaust silo 3 has an instantaneous high pressure, which is discharged through the cloth bag breathing cap 11 installed on the top of the buffer exhaust silo 3 and the dust collector 6. When the dust removal negative pressure is too low, gas is supplemented into the buffer exhaust silo 3 through the cloth bag breathing cap 11 to balance the pressure, avoiding overpressure rupture or suction collapse of the buffer exhaust silo 3.

[0030] The average feeding speed of the filling silo 5 can reach 100 bags / h, the control accuracy of the packaging bag reaches ±50 g, the powder recovery rate of the dust collector 6 is >99.99%, and the powder content at the gas outlet of the dust removal fan 10 is <5 mg / m 3 。

[0031] Example 2, an automatic feeding control device suitable for ultrafine powder, characterized in that: it includes a feeding unit and a dust removal unit. The feeding unit includes a powder silo 1, a pneumatic slide valve 2, a buffer exhaust silo 3, a pneumatic butterfly valve 4, and a filling silo 5 connected in sequence. The powder silo 1 contains powder with a particle size of 0.1 - 40 μm, 0.3 - 0.4 m 3 / t, easily caking ultrafine powder. There is a vibrating feeder 13 with a 1700mm diameter at the lower part of the powder bin 1. The vibrating feeder 13 is provided with at least two symmetric vibrators 14. The lower part is connected to a 600mm pneumatic slide valve 2. The pneumatic slide valve 2 can control the opening degree through limit control. The upper part of the buffer exhaust bin 3 is an oval cylinder 28 with a height of 1000mm and a diameter of 1200mm. A pressure gauge 29 is installed at the top, and the lower part is connected to a conical hopper 27. The cone angle of the conical hopper 27 is 75°. Each conical hopper 27 is provided with a 300mm circular discharging port 26 at the bottom. Each independent discharging port 26 is provided with a pneumatic butterfly valve 4 communicated with the filling bin 5. A buffer exhaust bin level gauge 15 is arranged 800mm above the center position of each independent discharging port 26. The buffer exhaust bin level gauge 15, the pneumatic slide valve 2, and the vibrator 14 are electrically connected and interlocked through a PLC. The filling bin 5 is provided with a sight glass 21 and a filling bin level gauge 22. A fluidizer 24 is arranged at the bottom of the filling bin 5. Compressed air with a pressure of 0.08MPa is conveyed to the filling bin through the fluidizer 24. The filling bin level gauge 22 and the pneumatic butterfly valve 4 are interlocked through a PLC; The dust removal unit includes a dust collector 6, a tail gas dust collector 9, and a dust removal fan 10 connected in sequence. One side of the top of the buffer exhaust bin is provided with a cloth bag breathing cap 11, and the other side is provided with a dust removal port 12. The dust collector 6 is a detachable cylindrical cloth bag filter installed above the dust removal port 12. The dust collector 6 is provided with a 125mm cylindrical filter element 17 and a matching keel 16. A pulse pipeline 18 is arranged on the side of the upper end of the dust collector 6 and the pulse pipeline 18 extends into the dust collector 6. The pulse pipeline 18 is vertically inserted into the center of the filter element 17 and is provided with multi-angle three-dimensional distribution air holes 19. The pressure of the compressed air in the compressed air tank 7 is 0.4MPa and is connected to the pulse pipeline 18 through a solenoid valve 20. The solenoid valve 20 is electrically connected to the backflush controller 8.

[0032] (1) When the buffer exhaust bin level gauge 15 of the conical hopper 27 of the buffer exhaust bin 3 has no material, the buffer exhaust bin level gauge 15 outputs a no-material signal. After a 60s delay, the PLC outputs a signal to control the vibrator 14 of the vibrating feeder 13 to start, and at the same time controls the pneumatic slide valve 2 to open to 35% of the valve position. The powder bin 1 starts to feed materials to the buffer exhaust bin 3. After a 5s delay when all the buffer exhaust bin level gauges 15 show a high material level, the PLC gives a stop signal to the vibrator 14 and outputs a closing signal for the pneumatic slide valve 2 at the same time;

[0033] (2) The filling bin level gauge 22 outputs a no-material signal to the PLC. The PLC outputs a signal to open the pneumatic butterfly valve 4 for discharging materials of the corresponding filling bin 5. The filling bin 5 exhausts air to the buffer exhaust bin 3, fluidizes the materials and then feeds materials to the filling bin 5. After the filling bin level gauge 22 outputs a signal indicating there is material, the PLC outputs a signal to close the corresponding pneumatic butterfly valve 4;

[0034] (3) The powder material in the powder silo 1 and the gas discharged from the filling silo 5 into the buffer exhaust silo 3. After the entrained powder passes through the dust collector 6, the powder is filtered out and adsorbed on the outer side of the filter element 17. The gas passes through the filter holes of the filter element 17 and enters the tail gas dust collector 9 for secondary filtration. The clean tail gas is discharged through the dust removal fan 10;

[0035] (4) The backflush controller 8 outputs a signal to switch the solenoid valve 20 every 60 s, controlling the backflush frequency of the compressed air on the filter element 17, and blowing the powder adsorbed on the outer side of the filter element 17 back into the buffer exhaust silo 3;

[0036] (5) An adjustable air damper 30 is installed between the dust collector 6 and the tail gas dust collector 9 to control the normal pressure of the buffer exhaust silo 3 to be 0.5 kPa. When the pneumatic butterfly valve 4 is opened, the pressure in the buffer exhaust silo 3 is negative pressure or normal pressure. The compressed air in the filling silo 5 enters the buffer exhaust silo 3 with lower pressure to break the arch of the powder in the buffer exhaust silo 3. The compressed air is discharged into the atmosphere through the cloth bag breathing cap 11 or the dust collector 6. After the powder in the buffer exhaust silo 3 is broken arch, it enters the filling silo 5;

[0037] (6) When the pulse pipeline 18 is purged, the instantaneous high pressure in the buffer exhaust silo 3 is discharged through the cloth bag breathing cap 11 and the dust collector 6 installed on the top of the buffer exhaust silo 3. When the dust removal negative pressure is too low, gas is supplemented into the buffer exhaust silo 3 through the cloth bag breathing cap 11 to balance the pressure, avoiding overpressure rupture or suction collapse of the buffer exhaust silo 3.

[0038] The average feeding speed of the filling silo 5 can reach 120 bags / h, the control accuracy of the packaging bag reaches ±50 g, the powder recovery rate of the dust collector 6 > 99.99%, and the powder content at the gas outlet of the dust removal fan 10 < 5 mg / m 3 。

[0039] Embodiment 3, an automatic feeding control device suitable for ultrafine powder, characterized in that: it includes a feeding unit and a dust removal unit. The feeding unit includes a powder silo 1, a pneumatic slide valve 2, a buffer exhaust silo 3, a pneumatic butterfly valve 4, and a filling silo 5 connected in sequence. The powder silo 1 contains powder with a particle size of 0.1 - 40 μm, 0.3 - 0.4 m 3 / t. The easily caking ultrafine powder, there is a vibrating feeder 13 with a diameter of 1500 mm at the lower part of the powder bin 1. The vibrating feeder 13 is provided with at least two symmetric vibrators 14, and is connected to a pneumatic slide valve 2 with a diameter of 500 mm at the lower part. The pneumatic slide valve 2 can control the opening degree through limit. The upper part of the buffer exhaust bin 3 is an oval cylinder 28 with a height of 800 mm and a diameter of 1000 mm. A pressure gauge 29 is installed at the top, and a conical hopper 27 is connected at the lower part. The cone angle of the conical hopper 27 is 70°. A circular blanking port 26 with a diameter of 250 mm is provided at the bottom of each conical hopper 27. Each independent blanking port 26 is provided with a pneumatic butterfly valve 4 to communicate with the filling bin 5. A buffer exhaust bin level gauge 15 is arranged 750 mm above the center position of each independent blanking port 26. The buffer exhaust bin level gauge 15, the pneumatic slide valve 2, and the vibrator 14 are connected by electrical signals and interlocked through PLC. The filling bin 5 is provided with a sight glass 21 and a filling bin level gauge 22. A fluidizer 24 is provided at the bottom of the filling bin 5. Compressed air with a pressure of 0.05 MPa is conveyed to the filling bin through the fluidizer 24. The filling bin level gauge 22 and the pneumatic butterfly valve 4 are interlocked through PLC; The dust removal unit includes a dust collector 6, a tail gas dust collector 9, and a dust removal fan 10 connected in sequence. A cloth bag breathing cap 11 is provided on one side of the top of the buffer exhaust bin, and a dust removal port 12 is provided on the other side. The dust collector 6 is a detachable cylindrical cloth bag filter, installed above the dust removal port 12. A 110 mm cylindrical filter element 17 and a matching keel 16 are provided inside the dust collector 6. A pulse pipeline 18 is provided on the side of the upper end of the dust collector 6 and the pulse pipeline 18 extends into the dust collector 6. The pulse pipeline 18 is vertically inserted into the center of the filter element 17 and is provided with multi-angle three-dimensional distribution air holes 19. The pressure of the compressed air in the compressed air tank 7 is 0.35 MPa and is connected to the pulse pipeline 18 through a solenoid valve 20. The solenoid valve 20 is connected to the backflush controller 8 through an electrical signal.

[0040] An automatic blanking control method applicable to ultrafine powder, comprising the following steps:

[0041] (1) When the buffer exhaust bin level gauge 15 of the conical hopper 27 of the buffer exhaust bin 3 has no material, the buffer exhaust bin level gauge 15 outputs a no-material signal. After a delay of 45 s, the PLC outputs a signal to control the start of the vibrator 14 of the vibrating feeder 13, and at the same time controls the pneumatic slide valve 2 to open 25% of the valve position. The powder bin 1 starts to feed the buffer exhaust bin 3. After a delay of 3 s when all the buffer exhaust bin level gauges 15 show a high level, the PLC gives a stop signal to the vibrator 14 and outputs a closing signal for the pneumatic slide valve 2 at the same time;

[0042] (2) The level gauge 22 of the filling bin outputs a signal indicating no material to the PLC, and the PLC outputs a signal to open the pneumatic butterfly valve 4 for discharging materials in the corresponding filling bin 5. The filling bin 5 exhausts air to the buffer exhaust bin 3, fluidizes the materials, and then feeds the materials to the filling bin 5. After the level gauge 22 of the filling bin outputs a signal indicating the presence of materials, the PLC outputs a signal to close the corresponding pneumatic butterfly valve 4;

[0043] (3) The powder materials discharged from the powder bin 1 and the gas in the filling bin 5 discharged into the buffer exhaust bin 3, and the entrained powder materials pass through the dust collector 6. The powder materials are filtered out and adsorbed on the outer side of the filter element 17, and the gas passes through the filter holes of the filter element 17 and enters the tail gas dust collector 9 for secondary filtration. The clean tail gas is discharged through the dust removal fan 10;

[0044] (4) The backflush controller 8 outputs a signal to switch the solenoid valve 20 every 40 s, controlling the backflush frequency of the compressed air on the filter element 17, and blowing the powder materials adsorbed on the outer side of the filter element 17 back into the buffer exhaust bin 3;

[0045] (5) An adjustable air damper 30 is installed between the dust collector 6 and the tail gas dust collector 9 to control the normal pressure of the buffer exhaust bin 3 to be 0.3 kPa. When the pneumatic butterfly valve 4 is opened, the pressure in the buffer exhaust bin 3 is negative pressure or normal pressure. The compressed air in the filling bin 5 enters the buffer exhaust bin 3 with lower pressure, breaking the arch of the powder materials in the buffer exhaust bin 3. The compressed air is discharged into the atmosphere through the cloth bag breathing cap 11 or the dust collector 6. After the powder materials in the buffer exhaust bin 3 are broken arch, they enter the filling bin 5;

[0046] (6) When the pulse pipeline 18 is purged, there is an instantaneous high pressure in the buffer exhaust bin 3, which is discharged through the cloth bag breathing cap 11 installed on the top of the buffer exhaust bin 3 and the dust collector 6. When the dust removal negative pressure is too low, gas is supplemented into the buffer exhaust bin 3 through the cloth bag breathing cap 11 to balance the pressure, avoiding overpressure rupture or suction collapse of the buffer exhaust bin 3.

[0047] The average discharging speed of the filling bin 5 can reach 110 bags / h, the control accuracy of the packaging bag reaches ±50 g, the powder recovery rate of the dust collector 6 > 99.99%, and the powder content at the air outlet of the dust removal fan 10 < 5 mg / m 3 。

[0048] Example 4, an automatic blanking control device suitable for ultrafine powder, characterized in that: it includes a blanking unit and a dust removal unit. The blanking unit includes a powder bin 1, a pneumatic slide valve 2, a buffer exhaust bin 3, a pneumatic butterfly valve 4, and a filling bin 5 connected in sequence. The powder bin 1 contains powder with a particle size of 0.1 - 40 μm, 0.3 - 0.4 m 3 / t, Easy-to-bond ultrafine powder. There is a vibrating feeder 13 with a 1200mm diameter at the lower part of the powder bin 1. The vibrating feeder 13 is equipped with at least two symmetric vibrators 14. The lower part is connected to a 400mm pneumatic slide valve 2. The pneumatic slide valve 2 can control the opening degree through limit. The upper part of the buffer exhaust bin 3 is an oval cylinder 28 with a height of 600mm and a diameter of 800mm. A pressure gauge 29 is installed at the top. The lower part is connected to 2 conical hoppers 27. The cone angle of the conical hopper 27 is 60°. Each conical hopper 27 is provided with a 200mm circular discharge port 26 at the bottom. Each independent discharge port 26 is provided with a pneumatic butterfly valve 4 to communicate with the filling bin 5. A buffer exhaust bin level gauge 15 is set 500mm above the center position of each independent discharge port 26. The buffer exhaust bin level gauge 15, the pneumatic slide valve 2, and the vibrator 14 are electrically connected and interlocked through the PLC. The filling bin 5 is provided with a sight glass 21 and a filling bin level gauge 22. A fluidizer 24 is provided at the bottom of the filling bin 5. Compressed air with a pressure of 0.03MPa is conveyed to the filling bin through the fluidizer 24. The filling bin level gauge 22 and the pneumatic butterfly valve 4 are interlocked through the PLC; The dust removal unit includes a dust collector 6, a tail gas dust collector 9, and a dust removal fan 10 connected in sequence. One side of the top of the buffer exhaust bin is provided with a cloth bag breathing cap 11, and the other side is provided with a dust removal port 12. The dust collector 6 is a detachable cylindrical cloth bag filter installed above the dust removal port 12. The dust collector 6 is provided with a 100mm cylindrical filter element 17 and a matching keel 16. A pulse pipeline 18 is provided on the side of the upper end of the dust collector 6 and the pulse pipeline 18 extends into the dust collector 6. The pulse pipeline 18 is vertically inserted into the center of the filter element 17 and is provided with multi-angle three-dimensional distribution air holes 19. The pressure of the compressed air in the compressed air tank 7 is 0.3MPa and is connected to the pulse pipeline 18 through a solenoid valve 20. The solenoid valve 20 is electrically connected to the backflush controller 8.

[0049] An automatic feeding control method suitable for ultrafine powder includes the following steps:

[0050] (1) When any one of the two buffer exhaust bin level gauges 15 corresponding to the two conical hoppers 27 of the buffer exhaust bin 3 is out of material, one of the two buffer exhaust bin level gauges 15 outputs an out-of-material signal. After a 5s delay, the PLC outputs a signal to control the start of the vibrator 14 of the vibrating feeder 13. At the same time, it controls the pneumatic slide valve 2 to open to 15% valve position. The powder bin 1 starts to feed the buffer exhaust bin 3. After a 0s delay when all the buffer exhaust bin level gauges 15 show a high level, the PLC gives a stop signal to the vibrator 14 and outputs a closing signal for the pneumatic slide valve 2 at the same time;

[0051] (2) If any one of the two bin level gauges 22 corresponding to the two hoppers outputs a signal indicating no material to the PLC, the PLC outputs a signal to open the pneumatic butterfly valve 4 for discharging in the corresponding filling bin 5. The filling bin 5 exhausts air to the buffer and exhaust bin 3, fluidizes the material, and then feeds the material to the filling bin 5. After the bin level gauge 22 of the filling bin 5 outputs a signal indicating the presence of material, the PLC outputs a signal to close the corresponding pneumatic butterfly valve 4;

[0052] (3) The powder material discharged from the powder bin 1 and the gas discharged from the filling bin 5 into the buffer and exhaust bin 3 carry entrained powder. After passing through the dust collector 6, the powder is filtered out and adsorbed on the outer side of the filter element 17. The gas passes through the filter holes of the filter element 17 and enters the tail gas dust collector 9 for secondary filtration. The clean tail gas is discharged through the dust removal fan 10;

[0053] (4) The backflush controller 8 outputs a signal to switch the solenoid valve 20 at intervals of 5 s to control the backflush frequency of the compressed air on the filter element 17, and blows the powder adsorbed on the outer side of the filter element 17 back into the buffer and exhaust bin 3;

[0054] (5) An adjustable air damper 30 is installed between the dust collector 6 and the tail gas dust collector 9 to control the normal pressure of the buffer and exhaust bin 3 to be -0.1 kPa. When the pneumatic butterfly valve 4 is opened, the pressure in the buffer and exhaust bin 3 is negative or normal. The compressed air in the filling bin 5 enters the buffer and exhaust bin 3 with a lower pressure, breaks the arch of the powder in the buffer and exhaust bin 3, and the compressed air is discharged into the atmosphere through the cloth bag breathing cap 11 or the dust collector 6. After the powder in the buffer and exhaust bin 3 is broken, it enters the filling bin 5;

[0055] (6) When the pulse pipeline 18 is purged, there is an instantaneous high pressure in the buffer and exhaust bin 3, which is discharged through the cloth bag breathing cap 11 installed on the top of the buffer and exhaust bin 3 and the dust collector 6. When the dust removal negative pressure is too low, gas is supplemented into the buffer and exhaust bin 3 through the cloth bag breathing cap 11 to balance the pressure, avoiding overpressure rupture or suction collapse of the buffer and exhaust bin 3.

[0056] The average discharging speed of the filling bin 5 can reach 100 bags / h, the control accuracy of the packaging bag reaches ±50 g, the powder recovery rate of the dust collector 6 is >99.99%, and the powder content at the air outlet of the dust removal fan 10 is <5 mg / m 3 。

[0057] Example 5, an automatic blanking control device applicable to ultrafine powder, characterized in that: it includes a blanking unit and a dust removal unit. The blanking unit includes a powder bin 1, a pneumatic slide valve 2, a buffer and exhaust bin 3, a pneumatic butterfly valve 4, and a filling bin 5 connected in sequence. The powder bin 1 contains powder with a particle size of 0.1 - 40 μm, 0.3 - 0.4 m 3 / t, easily caking ultrafine powder, a vibrating feeder 13 with a diameter of 1700 mm is provided at the lower part of the powder bin 1. The vibrating feeder 13 is provided with at least two symmetric vibrators 14. The lower part is connected to a pneumatic slide valve 2 with a diameter of 600 mm. The pneumatic slide valve 2 can control the opening degree through limit control. The upper part of the buffer exhaust bin 3 is an oblong cylinder 28 with a height of 1000 mm and a diameter of 1200 mm. A pressure gauge 29 is installed at the top, and the lower part is connected to 2 conical hoppers 27. The cone angle of the conical hopper 27 is 75°. A circular blanking port 26 with a diameter of 300 mm is provided at the bottom of each conical hopper 27. Each independent blanking port 26 is provided with a pneumatic butterfly valve 4 to communicate with the filling bin 5. A buffer exhaust bin level gauge 15 is arranged 800 mm above the center position of each independent blanking port 26. The buffer exhaust bin level gauge 15, the pneumatic slide valve 2, and the vibrator 14 are electrically connected and interlocked through the PLC. The filling bin 5 is provided with a sight glass 21 and a filling bin level gauge 22. A fluidizer 24 is provided at the bottom of the filling bin 5. Compressed air with a pressure of 0.08 MPa is conveyed to the filling bin through the fluidizer 24. The filling bin level gauge 22 and the pneumatic butterfly valve 4 are interlocked through the PLC; The dust removal unit includes a dust collector 6, a tail gas dust collector 9, and a dust removal fan 10 connected in sequence. A cloth bag breathing cap 11 is provided on one side of the top of the buffer exhaust bin, and a dust removal port 12 is provided on the other side. The dust collector 6 is a detachable cylindrical cloth bag filter installed above the dust removal port 12. A 125 mm cylindrical filter element 17 and a matching keel 16 are provided inside the dust collector 6. A pulse pipeline 18 is provided on the upper side of the dust collector 6 and the pulse pipeline 18 extends into the dust collector 6. The pulse pipeline 18 is vertically inserted into the center of the filter element 17 and is provided with multi-angle three-dimensional distribution air holes 19. The pressure of the compressed air in the compressed air tank 7 is 0.4 MPa and is connected to the pulse pipeline 18 through a solenoid valve 20. The solenoid valve 20 is electrically connected to the backflush controller 8.

[0058] An automatic blanking control method suitable for ultrafine powder includes the following steps:

[0059] (1) When any one of the two buffer exhaust bin level gauges 15 corresponding to the two conical hoppers 27 of the buffer exhaust bin 3 is out of material, one of the two buffer exhaust bin level gauges 15 outputs an out-of-material signal. After a delay of 60 s, the PLC outputs a signal to control the vibrator 14 of the vibrating feeder 13 to start, and at the same time controls the pneumatic slide valve 2 to open to 35% of the valve position. The powder bin 1 starts to feed the buffer exhaust bin 3. After a delay of 5 s when all the buffer exhaust bin level gauges 15 show a high level, the PLC gives a stop signal to the vibrator 14 and outputs a closing signal for the pneumatic slide valve 2 at the same time;

[0060] (2) If any one of the two bin level gauges 22 corresponding to the two hoppers outputs a signal indicating no material to the PLC, the PLC outputs a signal to open the pneumatic butterfly valve 4 for discharging in the corresponding filling bin 5. The filling bin 5 exhausts air to the buffer and exhaust bin 3, fluidizes the material, and then feeds the material to the filling bin 5. After the bin level gauge 22 of the filling bin 5 outputs a signal indicating the presence of material, the PLC outputs a signal to close the corresponding pneumatic butterfly valve 4;

[0061] (3) The powder material discharged from the powder bin 1 and the gas discharged from the filling bin 5 into the buffer and exhaust bin 3 carry entrained powder. After passing through the dust collector 6, the powder is filtered out and adsorbed on the outer side of the filter element 17. The gas passes through the filter holes of the filter element 17 and enters the tail gas dust collector 9 for secondary filtration. The clean tail gas is discharged through the dust removal fan 10;

[0062] (4) The backflush controller 8 outputs a signal to switch the solenoid valve 20 at intervals of 60 s to control the backflush frequency of the compressed air on the filter element 17, and blows the powder adsorbed on the outer side of the filter element 17 back into the buffer and exhaust bin 3;

[0063] (5) An adjustable air damper 30 is installed between the dust collector 6 and the tail gas dust collector 9 to control the normal pressure of the buffer and exhaust bin 3 to be 0.5 kPa. When the pneumatic butterfly valve 4 is opened, the pressure in the buffer and exhaust bin 3 is negative pressure or normal pressure. The compressed air in the filling bin 5 enters the buffer and exhaust bin 3 with lower pressure to break the arch of the powder in the buffer and exhaust bin 3. The compressed air is discharged into the atmosphere through the cloth bag breathing cap 11 or the dust collector 6. After the powder in the buffer and exhaust bin 3 is broken arch, it enters the filling bin 5;

[0064] (6) When the pulse pipeline 18 is purged, there is an instantaneous high pressure in the buffer and exhaust bin 3, which is discharged through the cloth bag breathing cap 11 installed on the top of the buffer and exhaust bin 3 and the dust collector 6. When the dust removal negative pressure is too low, gas is supplemented into the buffer and exhaust bin 3 through the cloth bag breathing cap 11 to balance the pressure, avoiding overpressure rupture or suction collapse of the buffer and exhaust bin 3.

[0065] The average discharging speed of the filling bin 5 can reach 120 bags / h, the control accuracy of the packaging bag reaches ±50 g, the powder recovery rate of the dust collector 6 > 99.99%, and the powder content at the air outlet of the dust removal fan 10 < 5 mg / m 3 。

[0066] Example 6, an automatic blanking control device suitable for ultrafine powder, characterized in that: it includes a blanking unit and a dust removal unit. The blanking unit includes a powder bin 1, a pneumatic slide gate valve 2, a buffer and exhaust bin 3, a pneumatic butterfly valve 4, and a filling bin 5 connected in sequence. The powder bin 1 contains powder with a particle size of 0.1 - 40 μm, 0.3 - 0.4 m 3 / t. The easily caking ultrafine powder, a vibrating feeder 13 with a 1500mm diameter is provided at the lower part of the powder bin 1. The vibrating feeder 13 is provided with at least two symmetric vibrators 14. The lower part is connected to a 500mm pneumatic slide valve 2. The pneumatic slide valve 2 can control the opening degree through limit. The upper part of the buffer exhaust bin 3 is an oblong cylinder 28 with a height of 800mm and a diameter of 1000mm. A pressure gauge 29 is installed at the top. The lower part is connected to 2 conical hoppers 27. The cone angle of the conical hopper 27 is 70°. A 250mm circular discharge port 26 is provided at the bottom of each conical hopper 27. A pneumatic butterfly valve 4 is provided at each independent discharge port 26 to communicate with the filling bin 5. A buffer exhaust bin level gauge 15 is arranged 750mm above the center position of each independent discharge port 26. The buffer exhaust bin level gauge 15, the pneumatic slide valve 2, and the vibrator 14 are electrically connected and interlocked through the PLC. The filling bin 5 is provided with a sight glass 21 and a filling bin level gauge 22. A fluidizer 24 is provided at the bottom of the filling bin 5. Compressed air with a pressure of 0.05MPa is conveyed to the filling bin through the fluidizer 24. The filling bin level gauge 22 and the pneumatic butterfly valve 4 are interlocked through the PLC; The dust removal unit includes a dust collector 6, a tail gas dust collector 9, and a dust removal fan 10 connected in sequence. A cloth bag breathing cap 11 is provided on one side of the top of the buffer exhaust bin, and a dust removal port 12 is provided on the other side. The dust collector 6 is a detachable cylindrical cloth bag filter, installed above the dust removal port 12. A 110mm cylindrical filter element 17 and a matching keel 16 are provided inside the dust collector 6. A pulse pipeline 18 is provided on the upper side of the dust collector 6 and the pulse pipeline 18 extends into the dust collector 6. The pulse pipeline 18 is vertically inserted into the center of the filter element 17 and is provided with multi-angle three-dimensional distribution air holes 19. The pressure of the compressed air in the compressed air tank 7 is 0.35MPa and is connected to the pulse pipeline 18 through a solenoid valve 20. The solenoid valve 20 is electrically connected to the backflush controller 8.

[0067] An automatic blanking control method applicable to ultrafine powder includes the following steps:

[0068] (1) When any one of the two buffer exhaust bin level gauges 15 corresponding to the two conical hoppers 27 of the buffer exhaust bin 3 is out of material, one of the two buffer exhaust bin level gauges 15 outputs an out-of-material signal. After a 45s delay, the PLC outputs a signal to control the vibrator 14 of the vibrating feeder 13 to start, and at the same time controls the pneumatic slide valve 2 to open 25% of the valve position. The powder bin 1 starts to feed the buffer exhaust bin 3. After a 3s delay when all the buffer exhaust bin level gauges 15 show a high material level, the PLC gives a stop signal to the vibrator 14 and outputs a closing signal for the pneumatic slide valve 2 at the same time;

[0069] (2) If any one of the two bin level gauges 22 corresponding to the two hoppers outputs a signal indicating no material to the PLC, the PLC outputs a signal to open the pneumatic butterfly valve 4 for discharging in the corresponding filling bin 5. The filling bin 5 exhausts air to the buffer and exhaust bin 3, fluidizes the material, and then feeds the material to the filling bin 5. After the bin level gauge 22 of the filling bin 5 outputs a signal indicating the presence of material, the PLC outputs a signal to close the corresponding pneumatic butterfly valve 4;

[0070] (3) The powder discharged from the powder bin 1 and the gas discharged from the filling bin 5 into the buffer and exhaust bin 3 carry entrained powder. After passing through the dust collector 6, the powder is filtered out and adsorbed on the outer side of the filter element 17. The gas passes through the filter holes of the filter element 17 and enters the tail gas dust collector 9 for secondary filtration. The clean tail gas is discharged through the dust removal fan 10;

[0071] (4) The backflush controller 8 outputs a signal to switch the solenoid valve 20 at intervals of 40 s to control the backflush frequency of the compressed air on the filter element 17, and blows the powder adsorbed on the outer side of the filter element 17 back into the buffer and exhaust bin 3;

[0072] (5) An adjustable air damper 30 is installed between the dust collector 6 and the tail gas dust collector 9 to control the normal pressure of the buffer and exhaust bin 3 to be 0.3 kPa. When the pneumatic butterfly valve 4 is opened, the pressure in the buffer and exhaust bin 3 is negative pressure or normal pressure. The compressed air in the filling bin 5 enters the buffer and exhaust bin 3 with lower pressure to break the arch of the powder in the buffer and exhaust bin 3. The compressed air is discharged into the atmosphere through the cloth bag breathing cap 11 or the dust collector 6. After the powder in the buffer and exhaust bin 3 is broken arch, it enters the filling bin 5;

[0073] (6) When the pulse pipeline 18 is purged, there is an instantaneous high pressure in the buffer and exhaust bin 3, which is discharged through the cloth bag breathing cap 11 installed on the top of the buffer and exhaust bin 3 and the dust collector 6. When the dust removal negative pressure is too low, gas is supplemented into the buffer and exhaust bin 3 through the cloth bag breathing cap 11 to balance the pressure, avoiding overpressure rupture or suction collapse of the buffer and exhaust bin 3.

[0074] The average discharging speed of the filling bin 5 can reach 110 bags / h, the control accuracy of the packaging bag reaches ±50 g, the powder recovery rate of the dust collector 6 > 99.99%, and the powder content at the air outlet of the dust removal fan 10 < 5 mg / m 3 。

[0075] Example 7, an automatic blanking control device suitable for ultrafine powder, characterized in that: it includes a blanking unit and a dust removal unit. The blanking unit includes a powder bin 1, a pneumatic slide valve 2, a buffer and exhaust bin 3, a pneumatic butterfly valve 4, and a filling bin 5 connected in sequence. The powder bin 1 contains powder with a particle size of 0.1 - 40 μm, 0.3 - 0.4 m 3 / t. The easily caking ultrafine powder, there is a vibrating feeder 13 with a 1200mm diameter at the lower part of the powder bin 1. The vibrating feeder 13 is provided with at least two symmetric vibrators 14, and is connected to a 400mm pneumatic slide valve 2 at the lower part. The pneumatic slide valve 2 can control the opening degree through limit. The upper part of the buffer exhaust bin 3 is an oblong cylinder 28 with a height of 600mm and a diameter of 800mm. A pressure gauge 29 is installed at the top, and 3 conical hoppers 27 are connected at the lower part. The conical angle of the conical hopper 27 is 60°. A 200mm circular blanking port 26 is provided at the bottom of each conical hopper 27. Each independent blanking port 26 is provided with a pneumatic butterfly valve 4 to communicate with the filling bin 5. A buffer exhaust bin level gauge 15 is arranged 500mm above the center position of each independent blanking port 26. The buffer exhaust bin level gauge 15, the pneumatic slide valve 2, and the vibrator 14 are connected by electrical signals and interlock control is realized through the PLC. The filling bin 5 is provided with a sight glass 21 and a filling bin level gauge 22. A fluidizer 24 is provided at the bottom of the filling bin 5. Compressed air with a pressure of 0.03MPa is conveyed to the filling bin through the fluidizer 24. The filling bin level gauge 22 and the pneumatic butterfly valve 4 realize interlock control through the PLC; The dust removal unit includes a dust collector 6, a tail gas dust collector 9, and a dust removal fan 10 connected in sequence. One side of the top of the buffer exhaust bin is provided with a cloth bag breathing cap 11, and the other side is provided with a dust removal port 12. The dust collector 6 is a detachable cylindrical bag filter, installed above the dust removal port 12. A 100mm cylindrical filter element 17 and a matching keel 16 are arranged in the dust collector 6. A pulse pipeline 18 is provided on the side of the upper end of the dust collector 6 and the pulse pipeline 18 extends into the dust collector 6. The pulse pipeline 18 is vertically inserted into the center of the filter element 17 and is provided with multi-angle three-dimensional distribution air holes 19. The pressure of the compressed air in the compressed air tank 7 is 0.3MPa and is connected to the pulse pipeline 18 through a solenoid valve 20. The solenoid valve 20 is connected to the backflush controller 8 through an electrical signal.

[0076] An automatic blanking control method suitable for ultrafine powder, comprising the following steps:

[0077] (1) When any one of the three buffer exhaust bin level gauges 15 corresponding to the three conical hoppers 27 of the buffer exhaust bin 3 is out of material, one of the three buffer exhaust bin level gauges 15 outputs a signal of out of material. After a delay of 5s, the PLC outputs a signal to control the start of the vibrator 14 of the vibrating feeder 13, and at the same time controls the pneumatic slide valve 2 to open 15% of the valve position. The powder bin 1 starts to feed materials to the buffer exhaust bin 3. After a delay of 0s when all the buffer exhaust bin level gauges 15 show a high material level, the PLC gives a stop signal to the vibrator 14 and outputs a closing signal for the pneumatic slide valve 2 at the same time;

[0078] (2) When any one of the three level gauges 22 of the three hoppers corresponding to the three filling bins outputs a signal indicating no material to the PLC, the PLC outputs a signal to open the pneumatic butterfly valve 4 for discharging materials in the corresponding filling bin 5. The filling bin 5 exhausts air to the buffer and exhaust bin 3, fluidizes the materials, and then feeds the materials to the filling bin 5. After the level gauge 22 of the filling bin 5 outputs a signal indicating the presence of materials, the PLC outputs a signal to close the corresponding pneumatic butterfly valve 4;

[0079] (3) The powder material discharged from the powder bin 1 and the gas discharged from the filling bin 5 into the buffer and exhaust bin 3 carry powder. After passing through the dust collector 6, the powder is filtered out and adsorbed on the outer side of the filter element 17. The gas passes through the filter holes of the filter element 17 and enters the tail gas dust collector 9 for secondary filtration. The clean tail gas is discharged through the dust removal fan 10;

[0080] (4) The backflush controller 8 outputs a signal to switch the solenoid valve 20 at intervals of 5 s to control the backflush frequency of the compressed air on the filter element 17, and blows the powder adsorbed on the outer side of the filter element 17 back into the buffer and exhaust bin 3;

[0081] (5) An adjustable air damper 30 is installed between the dust collector 6 and the tail gas dust collector 9 to control the normal pressure of the buffer and exhaust bin 3 to be -0.1 kPa. When the pneumatic butterfly valve 4 is opened, the pressure in the buffer and exhaust bin 3 is negative or normal. The compressed air in the filling bin 5 enters the buffer and exhaust bin 3 with a lower pressure to break the arch of the powder in the buffer and exhaust bin 3. The compressed air is discharged into the atmosphere through the cloth bag breathing cap 11 or the dust collector 6. After the powder in the buffer and exhaust bin 3 is broken arch, it enters the filling bin 5;

[0082] (6) When the pulse pipeline 18 is purged, there is an instantaneous high pressure in the buffer and exhaust bin 3, which is discharged through the cloth bag breathing cap 11 installed on the top of the buffer and exhaust bin 3 and the dust collector 6. When the dust removal negative pressure is too low, gas is supplemented into the buffer and exhaust bin 3 through the cloth bag breathing cap 11 to balance the pressure, avoiding overpressure rupture or suction collapse of the buffer and exhaust bin 3.

[0083] The average discharging speed of the filling bin 5 can reach 100 bags / h, the control accuracy of the packaging bag reaches ±50 g, the powder recovery rate of the dust collector 6 > 99.99%, and the powder content at the air outlet of the dust removal fan 10 < 5 mg / m 3 。

[0084] Example 8, an automatic blanking control device suitable for ultrafine powder, characterized in that: it includes a blanking unit and a dust removal unit. The blanking unit includes a powder bin 1, a pneumatic slide valve 2, a buffer and exhaust bin 3, a pneumatic butterfly valve 4, and a filling bin 5 connected in sequence. The powder bin 1 contains powder with a particle size of 0.1 - 40 μm, 0.3 - 0.4 m 3 / t. The easily caking ultrafine powder, a vibrating feeder 13 with a 1700 mm diameter is provided at the lower part of the powder bin 1. The vibrating feeder 13 is provided with at least two symmetric vibrators 14, and is connected to a 600 mm pneumatic slide valve 2 at the lower part. The pneumatic slide valve 2 can control the opening degree through limit control. The upper part of the buffer exhaust bin 3 is an oblong cylinder 28 with a height of 1000 mm and a diameter of 1200 mm. A pressure gauge 29 is installed at the top, and 3 hoppers 27 are connected at the lower part. The cone angle of the hopper 27 is 75°. A 300 mm circular discharge port 26 is provided at the bottom of each hopper 27. A pneumatic butterfly valve 4 is provided at each independent discharge port 26 and is communicated with the filling bin 5. A buffer exhaust bin level gauge 15 is arranged 800 mm above the center position of each independent discharge port 26. The buffer exhaust bin level gauge 15, the pneumatic slide valve 2, and the vibrator 14 are electrically connected and interlocked through the PLC. The filling bin 5 is provided with a sight glass 21 and a filling bin level gauge 22. A fluidizer 24 is provided at the bottom of the filling bin 5, and compressed air with a pressure of 0.08 MPa is conveyed to the filling bin through the fluidizer 24. The filling bin level gauge 22 and the pneumatic butterfly valve 4 are interlocked through the PLC; The dust removal unit includes a dust collector 6, a tail gas dust collector 9, and a dust removal fan 10 connected in sequence. A cloth bag breathing cap 11 is provided on one side of the top of the buffer exhaust bin, and a dust removal port 12 is provided on the other side. The dust collector 6 is a detachable cylindrical cloth bag filter, installed above the dust removal port 12. A 125 mm cylindrical filter element 17 and a matching keel 16 are provided inside the dust collector 6. A pulse pipeline 18 is provided on the side of the upper end of the dust collector 6 and the pulse pipeline 18 extends into the dust collector 6. The pulse pipeline 18 is vertically inserted into the center of the filter element 17 and is provided with multi-angle three-dimensional distribution air holes 19. The pressure of the compressed air in the compressed air tank 7 is 0.4 MPa and is connected to the pulse pipeline 18 through a solenoid valve 20. The solenoid valve 20 is electrically connected to the backflush controller 8.

[0085] An automatic blanking control method applicable to ultrafine powder, comprising the following steps:

[0086] (1) When any one of the three buffer exhaust bin level gauges 15 corresponding to the three hoppers 27 of the buffer exhaust bin 3 is out of material, one of the three buffer exhaust bin level gauges 15 outputs an out-of-material signal. After a 60 s delay, the PLC outputs a signal to control the start of the vibrator 14 of the vibrating feeder 13, and at the same time controls the pneumatic slide valve 2 to open to 35% of the valve position. The powder bin 1 starts to feed the buffer exhaust bin 3. After a 5 s delay when all the buffer exhaust bin level gauges 15 show a high level, the PLC gives a stop signal to the vibrator 14 and outputs a closing signal for the pneumatic slide valve 2 at the same time;

[0087] (2) When any one of the three level gauges 22 of the three hoppers corresponding to the three filling bins outputs a signal indicating no material to the PLC, the PLC outputs a signal to open the pneumatic butterfly valve 4 for discharging materials in the corresponding filling bin 5. The filling bin 5 exhausts air to the buffer exhaust bin 3, fluidizes the materials, and then feeds the materials to the filling bin 5. After the level gauge 22 of the filling bin 5 outputs a signal indicating the presence of materials, the PLC outputs a signal to close the corresponding pneumatic butterfly valve 4;

[0088] (3) The powder materials discharged from the powder bin 1 and the gas discharged from the filling bin 5 into the buffer exhaust bin 3 carry powder materials. After passing through the dust collector 6, the powder materials are filtered out and adsorbed on the outer side of the filter element 17. The gas passes through the filter holes of the filter element 17 and enters the tail gas dust collector 9 for secondary filtration. The clean tail gas is discharged through the dust removal fan 10;

[0089] (4) The backflush controller 8 outputs a signal to switch the solenoid valve 20 at intervals of 60 s to control the backflush frequency of the compressed air on the filter element 17, and blows the powder materials adsorbed on the outer side of the filter element 17 back into the buffer exhaust bin 3;

[0090] (5) An adjustable air damper 30 is installed between the dust collector 6 and the tail gas dust collector 9 to control the normal pressure of the buffer exhaust bin 3 to be 0.5 kPa. When the pneumatic butterfly valve 4 is opened, the pressure in the buffer exhaust bin 3 is negative pressure or normal pressure. The compressed air in the filling bin 5 enters the buffer exhaust bin 3 with lower pressure to break the arch of the powder materials in the buffer exhaust bin 3. The compressed air is discharged into the atmosphere through the cloth bag breathing cap 11 or the dust collector 6. After the powder materials in the buffer exhaust bin 3 are broken, they enter the filling bin 5;

[0091] (6) When the pulse pipeline 18 is purged, there is an instant high pressure in the buffer exhaust bin 3, which is discharged through the cloth bag breathing cap 11 installed on the top of the buffer exhaust bin 3 and the dust collector 6. When the dust removal negative pressure is too low, gas is supplemented into the buffer exhaust bin 3 through the cloth bag breathing cap 11 to balance the pressure, avoiding overpressure rupture or suction collapse of the buffer exhaust bin 3.

[0092] The average discharging speed of the filling bin 5 can reach 120 bags / h, the control accuracy of the packaging bag reaches ±50 g, the powder recovery rate of the dust collector 6 > 99.99%, and the powder content at the gas outlet of the dust removal fan 10 < 5 mg / m 3 。

[0093] Example 9, an automatic blanking control device suitable for ultrafine powder, characterized in that: it includes a blanking unit and a dust removal unit. The blanking unit includes a powder bin 1, a pneumatic slide valve 2, a buffer exhaust bin 3, a pneumatic butterfly valve 4, and a filling bin 5 connected in sequence. The powder bin 1 contains powder with a particle size of 0.1 - 40 μm, 0.3 - 0.4 m 3 / t. The easily caking ultrafine powder, there is a vibrating feeder 13 with a diameter of 1500 mm at the lower part of the powder bin 1. The vibrating feeder 13 is provided with at least two symmetric vibrators 14. The lower part is connected to a pneumatic slide valve 2 with a diameter of 500 mm. The pneumatic slide valve 2 can control the opening degree through limit control. The upper part of the buffer exhaust bin 3 is an oval cylinder 28 with a height of 800 mm and a diameter of 1000 mm. A pressure gauge 29 is installed at the top, and the lower part is connected to 3 conical hoppers 27. The cone angle of the conical hopper 27 is 70°. There is a circular discharge port 26 with a diameter of 250 mm at the bottom of each conical hopper 27. Each independent discharge port 26 is provided with a pneumatic butterfly valve 4 to communicate with the filling bin 5. A buffer exhaust bin level gauge 15 is set 750 mm above the center position of each independent discharge port 26. The buffer exhaust bin level gauge 15, the pneumatic slide valve 2, and the vibrator 14 are electrically connected and interlocked through the PLC. The filling bin 5 is provided with a sight glass 21 and a filling bin level gauge 22. A fluidizer 24 is provided at the bottom of the filling bin 5. Compressed air with a pressure of 0.05 MPa is conveyed to the filling bin through the fluidizer 24. The filling bin level gauge 22 and the pneumatic butterfly valve 4 are interlocked through the PLC; The dust removal unit includes a dust collector 6, a tail gas dust collector 9, and a dust removal fan 10 connected in sequence. One side of the top of the buffer exhaust bin is provided with a cloth bag breathing cap 11, and the other side is provided with a dust removal port 12. The dust collector 6 is a detachable cylindrical cloth bag filter, installed above the dust removal port 12. There is a 110 mm cylindrical filter element 17 and a matching keel 16 inside the dust collector 6. A pulse pipeline 18 is provided on the side of the upper end of the dust collector 6 and the pulse pipeline 18 extends into the dust collector 6. The pulse pipeline 18 is vertically inserted into the center of the filter element 17 and is provided with multi-angle three-dimensional distribution air holes 19. The pressure of the compressed air in the compressed air tank 7 is 0.35 MPa and is connected to the pulse pipeline 18 through a solenoid valve 20. The solenoid valve 20 is electrically connected to the backflush controller 8.

[0094] An automatic feeding control method applicable to ultrafine powder includes the following steps:

[0095] (1) When any one of the three buffer exhaust bin level gauges 15 corresponding to the three conical hoppers 27 of the buffer exhaust bin 3 has no material, one of the three buffer exhaust bin level gauges 15 outputs a no-material signal. After a delay of 45 s, the PLC outputs a signal to control the start of the vibrator 14 of the vibrating feeder 13, and at the same time controls the pneumatic slide valve 2 to open 25% of the valve position. The powder bin 1 starts to feed the buffer exhaust bin 3. After a delay of 3 s when all the buffer exhaust bin level gauges 15 show a high level, the PLC gives a stop signal to the vibrator 14 and at the same time outputs a closing signal for the pneumatic slide valve 2;

[0096] (2) If any one of the three bin level gauges 22 corresponding to the three hoppers outputs a signal indicating no material to the PLC, the PLC outputs a signal to open the pneumatic butterfly valve 4 for discharging in the corresponding filling bin 5. The filling bin 5 exhausts air to the buffer and exhaust bin 3, fluidizes the material, and then feeds the material to the filling bin 5. After the bin level gauge 22 of the filling bin 5 outputs a signal indicating the presence of material, the PLC outputs a signal to close the corresponding pneumatic butterfly valve 4;

[0097] (3) The powder material discharged from the powder bin 1 and the gas discharged from the filling bin 5 into the buffer and exhaust bin 3 carry entrained powder. After passing through the dust collector 6, the powder is filtered out and adsorbed on the outer side of the filter element 17. The gas passes through the filter holes of the filter element 17 and enters the tail gas dust collector 9 for secondary filtration. The clean tail gas is discharged through the dust removal fan 10;

[0098] (4) The backflush controller 8 outputs a signal to switch the solenoid valve 20 at intervals of 40 s to control the backflush frequency of the compressed air on the filter element 17, and blows the powder adsorbed on the outer side of the filter element 17 back into the buffer and exhaust bin 3;

[0099] (5) An adjustable air damper 30 is installed between the dust collector 6 and the tail gas dust collector 9 to control the normal pressure of the buffer and exhaust bin 3 to be 0.3 kPa. When the pneumatic butterfly valve 4 is opened, the pressure in the buffer and exhaust bin 3 is negative pressure or normal pressure. The compressed air in the filling bin 5 enters the buffer and exhaust bin 3 with lower pressure to break the arch of the powder in the buffer and exhaust bin 3. The compressed air is discharged into the atmosphere by the cloth bag breathing cap 11 or the dust collector 6. After the powder in the buffer and exhaust bin 3 is broken arch, it enters the filling bin 5;

[0100] (6) When the pulse pipeline 18 is purged, there is an instantaneous high pressure in the buffer and exhaust bin 3, which is discharged through the cloth bag breathing cap 11 installed on the top of the buffer and exhaust bin 3 and the dust collector 6. When the dust removal negative pressure is too low, gas is supplemented into the buffer and exhaust bin 3 through the cloth bag breathing cap 11 to balance the pressure, avoiding overpressure rupture or suction collapse of the buffer and exhaust bin 3.

[0101] The average discharging speed of the filling bin 5 can reach 110 bags / h, the control accuracy of the packaging bag reaches ±50 g, the powder recovery rate of the dust collector 6 is >99.99%, and the powder content at the air outlet of the dust removal fan 10 is <5 mg / m 3 。

[0102] Embodiment 10, an automatic blanking control device suitable for ultrafine powder, characterized in that: it includes a blanking unit and a dust removal unit. The blanking unit includes a powder bin 1, a pneumatic slide valve 2, a buffer and exhaust bin 3, a pneumatic butterfly valve 4, and a filling bin 5 connected in sequence. The powder bin 1 contains powder with a particle size of 0.1 - 40 μm, 0.3 - 0.4 m 3 / t, an easily caking ultrafine powder. There is a vibrating feeder 13 with a 1200mm diameter at the lower part of the powder bin 1. The vibrating feeder 13 is provided with at least two symmetric vibrators 14, and is connected to a 400mm pneumatic slide valve 2 at the lower part. The pneumatic slide valve 2 can control the opening degree through limit control. The upper part of the buffer exhaust bin 3 is an oval cylinder 28 with a height of 600mm and a diameter of 800mm. A pressure gauge 29 is installed at the top, and 4 conical hoppers 27 are connected at the lower part. The conical angle of the conical hopper 27 is 60°. Each conical hopper 27 is provided with a 200mm circular blanking port 26 at the bottom. Each independent blanking port 26 is provided with a pneumatic butterfly valve 4 to communicate with the filling bin 5. A buffer exhaust bin level gauge 15 is set 500mm above the center position of each independent blanking port 26. The buffer exhaust bin level gauge 15, the pneumatic slide valve 2, and the vibrator 14 are electrically connected and interlocked through the PLC. The filling bin 5 is provided with a sight glass 21 and a filling bin level gauge 22. A fluidizer 24 is provided at the bottom of the filling bin 5, and compressed air with a pressure of 0.03MPa is conveyed to the filling bin through the fluidizer 24. The filling bin level gauge 22 and the pneumatic butterfly valve 4 are interlocked through the PLC; The dust removal unit includes a dust collector 6, a tail gas dust collector 9, and a dust removal fan 10 connected in sequence. One side of the top of the buffer exhaust bin is provided with a cloth bag breathing cap 11, and the other side is provided with a dust removal port 12. The dust collector 6 is a detachable cylindrical bag filter installed above the dust removal port 12. The dust collector 6 is provided with a 100mm cylindrical filter element 17 and a matching keel 16. A pulse pipeline 18 is provided on the side of the upper end of the dust collector 6 and the pulse pipeline 18 extends into the dust collector 6. The pulse pipeline 18 is vertically inserted into the center of the filter element 17 and is provided with multi-angle three-dimensional distribution air holes 19. The pressure of the compressed air in the compressed air tank 7 is 0.3MPa and is connected to the pulse pipeline 18 through a solenoid valve 20. The solenoid valve 20 is electrically connected to the backflush controller 8.

[0103] An automatic blanking control method suitable for ultrafine powder includes the following steps:

[0104] (1) When any one of the four buffer exhaust bin level gauges 15 corresponding to the four conical hoppers 27 of the buffer exhaust bin 3 is out of material, one of the four buffer exhaust bin level gauges 15 outputs an out-of-material signal. After a 5s delay, the PLC outputs a signal to control the vibrator 14 of the vibrating feeder 13 to start, and at the same time controls the pneumatic slide valve 2 to open 15% of the valve position. The powder bin 1 starts to feed the buffer exhaust bin 3. After a 0s delay when all the buffer exhaust bin level gauges 15 show a high level, the PLC gives a stop signal to the vibrator 14 and outputs a closing signal for the pneumatic slide valve 2 at the same time;

[0105] (2) When any one of the four level gauges 22 of the four hoppers corresponding to the four filling silos outputs a signal indicating no material to the PLC, the PLC outputs a signal to open the pneumatic butterfly valve 4 for discharging material in the corresponding filling silo 5. The filling silo 5 exhausts air to the buffer and exhaust silo 3, fluidizes the material, and then feeds the material to the filling silo 5. After the level gauge 22 of the filling silo 5 outputs a signal indicating the presence of material, the PLC outputs a signal to close the corresponding pneumatic butterfly valve 4;

[0106] (3) The powder material discharged from the powder silo 1 and the gas discharged from the filling silo 5 into the buffer and exhaust silo 3 carry powder. After passing through the dust collector 6, the powder is filtered out and adsorbed on the outer side of the filter element 17. The gas passes through the filter holes of the filter element 17 and enters the tail gas dust collector 9 for secondary filtration. The clean tail gas is discharged through the dust removal fan 10;

[0107] (4) The backflush controller 8 outputs a signal to switch the solenoid valve 20 at intervals of 5 s to control the backflush frequency of the compressed air on the filter element 17, and blows the powder adsorbed on the outer side of the filter element 17 back into the buffer and exhaust silo 3;

[0108] (5) An adjustable air damper 30 is installed between the dust collector 6 and the tail gas dust collector 9 to control the normal pressure of the buffer and exhaust silo 3 to be -0.1 kPa. When the pneumatic butterfly valve 4 is opened, the pressure in the buffer and exhaust silo 3 is negative pressure or normal pressure. The compressed air in the filling silo 5 enters the buffer and exhaust silo 3 with lower pressure to break the arch of the powder in the buffer and exhaust silo 3. The compressed air is discharged into the atmosphere through the cloth bag breathing cap 11 or the dust collector 6. After the powder in the buffer and exhaust silo 3 is broken arch, it enters the filling silo 5;

[0109] (6) When the pulse pipeline 18 is purged, there is an instantaneous high pressure in the buffer and exhaust silo 3, which is discharged through the cloth bag breathing cap 11 installed on the top of the buffer and exhaust silo 3 and the dust collector 6. When the dust removal negative pressure is too low, gas is supplemented into the buffer and exhaust silo 3 through the cloth bag breathing cap 11 to balance the pressure, avoiding overpressure rupture or suction collapse of the buffer and exhaust silo 3.

[0110] The average discharging speed of the filling silo 5 can reach 100 bags / h, the control accuracy of the packaging bag reaches ±50 g, the powder recovery rate of the dust collector 6 is >99.99%, and the powder content at the gas outlet of the dust removal fan 10 is <5 mg / m 3 。

[0111] Example 11, an automatic feeding control device suitable for ultrafine powder, characterized in that: it includes a feeding unit and a dust removal unit. The feeding unit includes a powder silo 1, a pneumatic slide valve 2, a buffer and exhaust silo 3, a pneumatic butterfly valve 4, and a filling silo 5 connected in sequence. The powder silo 1 contains powder with a particle size of 0.1 - 40 μm, 0.3 - 0.4 m 3 / t. Ultra-fine powders that are prone to caking. A vibrating feeder 13 with a diameter of 1700 mm is provided at the lower part of the powder bin 1. The vibrating feeder 13 is provided with at least two symmetric vibrators 14. The lower part is connected to a pneumatic slide valve 2 with a diameter of 600 mm. The pneumatic slide valve 2 can control the opening degree through limit control. The upper part of the buffer exhaust bin 3 is an oval cylinder 28 with a height of 1000 mm and a diameter of 1200 mm. A pressure gauge 29 is installed at the top, and the lower part is connected to 4 conical hoppers 27. The cone angle of the conical hopper 27 is 75°. A circular blanking port 26 with a diameter of 300 mm is provided at the bottom of each conical hopper 27. Each independent blanking port 26 is provided with a pneumatic butterfly valve 4 to communicate with the filling bin 5. A buffer exhaust bin level gauge 15 is set 800 mm above the center position of each independent blanking port 26. The buffer exhaust bin level gauge 15, the pneumatic slide valve 2, and the vibrator 14 are electrically connected and interlocked through the PLC. The filling bin 5 is provided with a sight glass 21 and a filling bin level gauge 22. A fluidizer 24 is provided at the bottom of the filling bin 5. Compressed air with a pressure of 0.08 MPa is conveyed to the filling bin through the fluidizer 24. The filling bin level gauge 22 and the pneumatic butterfly valve 4 are interlocked through the PLC; The dust removal unit includes a dust collector 6, a tail gas dust collector 9, and a dust removal fan 10 connected in sequence. A cloth bag breathing cap 11 is provided on one side of the top of the buffer exhaust bin, and a dust removal port 12 is provided on the other side. The dust collector 6 is a detachable cylindrical cloth bag filter installed above the dust removal port 12. A 125 mm cylindrical filter element 17 and a matching keel 16 are provided inside the dust collector 6. A pulse pipeline 18 is provided on the upper side of the dust collector 6 and the pulse pipeline 18 extends into the dust collector 6. The pulse pipeline 18 is vertically inserted into the center of the filter element 17 and is provided with multi-angle three-dimensional distribution air holes 19. The pressure of the compressed air in the compressed air tank 7 is 0.4 MPa and is connected to the pulse pipeline 18 through a solenoid valve 20. The solenoid valve 20 is electrically connected to the backflush controller 8.

[0112] An automatic blanking control method suitable for ultra-fine powders includes the following steps:

[0113] (1) When any one of the four buffer exhaust bin level gauges 15 corresponding to the four conical hoppers 27 of the buffer exhaust bin 3 is out of material, one of the four buffer exhaust bin level gauges 15 outputs a signal indicating no material. After a delay of 60 s, the PLC outputs a signal to control the start of the vibrator 14 of the vibrating feeder 13. At the same time, it controls the pneumatic slide valve 2 to open to 35% of the valve position. The powder bin 1 starts to feed materials to the buffer exhaust bin 3. After a delay of 5 s when all the buffer exhaust bin level gauges 15 show a high material level, the PLC gives a stop signal to the vibrator 14 and outputs a closing signal for the pneumatic slide valve 2 at the same time;

[0114] (2) When any one of the four level gauges 22 of the four hoppers outputs a signal indicating no material to the PLC, the PLC outputs a signal to open the pneumatic butterfly valve 4 for discharging in the corresponding filling bin 5. The filling bin 5 exhausts air to the buffer and exhaust bin 3, fluidizes the material, and then feeds the material to the filling bin 5. After the level gauge 22 of the filling bin 5 outputs a signal indicating there is material, the PLC outputs a signal to close the corresponding pneumatic butterfly valve 4;

[0115] (3) The powder discharged from the powder bin 1 and the gas discharged from the filling bin 5 into the buffer and exhaust bin 3 carry powder. After passing through the dust collector 6, the powder is filtered out and adsorbed on the outer side of the filter element 17. The gas passes through the filter holes of the filter element 17 and enters the tail gas dust collector 9 for secondary filtration. The clean tail gas is discharged through the dust removal fan 10;

[0116] (4) The backflush controller 8 outputs a signal to switch the solenoid valve 20 at intervals of 60 s to control the backflush frequency of the compressed air on the filter element 17, and blows the powder adsorbed on the outer side of the filter element 17 back into the buffer and exhaust bin 3;

[0117] (5) An adjustable air damper 30 is installed between the dust collector 6 and the tail gas dust collector 9 to control the normal pressure of the buffer and exhaust bin 3 to be 0.5 kPa. When the pneumatic butterfly valve 4 is opened, the pressure in the buffer and exhaust bin 3 is negative pressure or normal pressure. The compressed air in the filling bin 5 enters the buffer and exhaust bin 3 with lower pressure to break the arch of the powder in the buffer and exhaust bin 3. The compressed air is discharged into the atmosphere by the cloth bag breathing cap 11 or the dust collector 6. After the powder in the buffer and exhaust bin 3 is broken arch, it enters the filling bin 5;

[0118] (6) When the pulse pipeline 18 is purged, there is an instant high pressure in the buffer and exhaust bin 3, which is discharged through the cloth bag breathing cap 11 installed on the top of the buffer and exhaust bin 3 and the dust collector 6. When the dust removal negative pressure is too low, gas is supplemented into the buffer and exhaust bin 3 through the cloth bag breathing cap 11 to balance the pressure, avoiding overpressure rupture or suction collapse of the buffer and exhaust bin 3.

[0119] The average discharging speed of the filling bin 5 can reach 120 bags / h, the control accuracy of the packaging bag reaches ±50 g, the powder recovery rate of the dust collector 6 > 99.99%, and the powder content at the air outlet of the dust removal fan 10 < 5 mg / m 3 。

[0120] Example 12, an automatic blanking control device suitable for ultrafine powder, characterized in that: it includes a blanking unit and a dust removal unit. The blanking unit includes a powder bin 1, a pneumatic slide valve 2, a buffer and exhaust bin 3, a pneumatic butterfly valve 4, and a filling bin 5 connected in sequence. The powder bin 1 contains powder with a particle size of 0.1 - 40 μm, 0.3 - 0.4 m 3 / t, easily caking ultrafine powder, a vibrating feeder 13 with a diameter of 1500 mm is provided at the lower part of the powder bin 1. The vibrating feeder 13 is provided with at least two symmetric vibrators 14. The lower part is connected to a pneumatic slide gate valve 2 with a diameter of 500 mm. The pneumatic slide gate valve 2 can control the opening degree through limit. The upper part of the buffer exhaust bin 3 is an oblong cylinder 28 with a height of 800 mm and a diameter of 1000 mm. A pressure gauge 29 is installed at the top, and the lower part is connected to 4 conical hoppers 27. The cone angle of the conical hopper 27 is 70°. A circular discharge port 26 with a diameter of 250 mm is provided at the bottom of each conical hopper 27. An air-operated butterfly valve 4 is provided at each independent discharge port 26 to communicate with the filling bin 5. A buffer exhaust bin level gauge 15 is arranged 750 mm above the center position of each independent discharge port 26. The buffer exhaust bin level gauge 15, the pneumatic slide gate valve 2, and the vibrator 14 are electrically connected and interlocked through the PLC. The filling bin 5 is provided with a sight glass 21 and a filling bin level gauge 22. A fluidizer 24 is provided at the bottom of the filling bin 5. Compressed air with a pressure of 0.05 MPa is conveyed to the filling bin through the fluidizer 24. The filling bin level gauge 22 and the air-operated butterfly valve 4 are interlocked through the PLC; The dust removal unit includes a dust collector 6, a tail gas dust collector 9, and a dust removal fan 10 connected in sequence. A cloth bag breathing cap 11 is provided on one side of the top of the buffer exhaust bin, and a dust removal port 12 is provided on the other side. The dust collector 6 is a detachable cylindrical cloth bag filter installed above the dust removal port 12. A 110 mm cylindrical filter element 17 and a matching keel 16 are provided inside the dust collector 6. A pulse pipeline 18 is provided on the side of the upper end of the dust collector 6 and the pulse pipeline 18 extends into the dust collector 6. The pulse pipeline 18 is vertically inserted into the center of the filter element 17 and is provided with multi-angle three-dimensional distribution air holes 19. The pressure of the compressed air in the compressed air tank 7 is 0.35 MPa and is connected to the pulse pipeline 18 through a solenoid valve 20. The solenoid valve 20 is electrically connected to the backflush controller 8.

[0121] An automatic blanking control method applicable to ultrafine powder includes the following steps:

[0122] (1) When any one of the four buffer exhaust bin level gauges 15 corresponding to the four conical hoppers 27 of the buffer exhaust bin 3 shows no material, one of the four buffer exhaust bin level gauges 15 outputs a no-material signal. After a delay of 45 s, the PLC outputs a signal to control the start of the vibrator 14 of the vibrating feeder 13, and at the same time controls the pneumatic slide gate valve 2 to open 25% of the valve position. The powder bin 1 starts to feed the buffer exhaust bin 3. After a delay of 3 s when all the buffer exhaust bin level gauges 15 show a high material level, the PLC gives a stop signal to the vibrator 14 and outputs a closing signal for the pneumatic slide gate valve 2 at the same time;

[0123] (2)When any one of the four level gauges 22 of the four hoppers outputs a signal indicating no material to the PLC, the PLC outputs a signal to open the pneumatic butterfly valve 4 for discharging in the corresponding filling bin 5. The filling bin 5 exhausts air to the buffer and exhaust bin 3, fluidizes the material, and then feeds the material to the filling bin 5. After the level gauge 22 of the filling bin 5 outputs a signal indicating the presence of material, the PLC outputs a signal to close the corresponding pneumatic butterfly valve 4;

[0124] (3)The powder material discharged from the powder bin 1 and the gas in the filling bin 5 discharged into the buffer and exhaust bin 3 carry entrained powder. After passing through the dust collector 6, the powder is filtered out and adsorbed on the outer side of the filter element 17. The gas passes through the filter holes of the filter element 17 and enters the tail gas dust collector 9 for secondary filtration. The clean tail gas is discharged through the dust removal fan 10;

[0125] (4)The backflush controller 8 outputs a signal to switch the solenoid valve 20 at intervals of 40 s to control the backflush frequency of the compressed air on the filter element 17, and blows the powder adsorbed on the outer side of the filter element 17 back into the buffer and exhaust bin 3;

[0126] (5)An adjustable air damper 30 is installed between the dust collector 6 and the tail gas dust collector 9 to control the normal pressure of the buffer and exhaust bin 3 to be 0.3 kPa. When the pneumatic butterfly valve 4 is opened, the pressure in the buffer and exhaust bin 3 is negative pressure or normal pressure. The compressed air in the filling bin 5 enters the buffer and exhaust bin 3 with lower pressure to break the arch of the powder in the buffer and exhaust bin 3. The compressed air is discharged into the atmosphere by the cloth bag breathing cap 11 or the dust collector 6. After the arch of the powder in the buffer and exhaust bin 3 is broken, it enters the filling bin 5;

[0127] (6)When the pulse pipeline 18 is purged, there is an instantaneous high pressure in the buffer and exhaust bin 3, which is discharged through the cloth bag breathing cap 11 installed on the top of the buffer and exhaust bin 3 and the dust collector 6. When the dust removal negative pressure is too low, gas is supplemented into the buffer and exhaust bin 3 through the cloth bag breathing cap 11 to balance the pressure, avoiding overpressure rupture or suction collapse of the buffer and exhaust bin 3.

[0128] The average discharging speed of the filling bin 5 can reach 110 bags / h, the control accuracy of the packaging bag reaches ±50 g, the powder recovery rate of the dust collector 6 is >99.99%, and the powder content at the air outlet of the dust removal fan 10 is <5 mg / m 3 .

Claims

1. A device for automatic feeding control of ultrafine powders, characterized in that: It includes a feeding unit and a dust removal unit. The feeding unit includes a powder silo, a pneumatic gate valve, a buffer exhaust silo, a pneumatic butterfly valve, and a filling silo which are connected in sequence. The dust removal unit includes a dust collector, an exhaust dust collector, and a dust removal fan which are connected in sequence. A bag breathing cap is provided on one side of the top of the buffer exhaust silo, and a dust removal port is provided on the other side. The dust collector is a detachable cylindrical bag filter which is installed above the dust removal port. A 100-125mm cylindrical filter element and an adaptor keel are provided in the dust collector. A pulse pipeline is provided on the upper side of the dust collector and the pulse pipeline extends into the dust collector. The pulse pipeline is connected to the compressed air tank through a solenoid valve, and the solenoid valve is connected to the backblowing controller through an electrical signal.

2. The automatic feeding control device for ultrafine powders according to claim 1, characterized in that: A 1200-1700mm caliber vibrating feeder is provided at the bottom of the powder silo. The vibrating feeder is provided with at least two symmetrical vibrators. The lower part is connected to a 400-600mm pneumatic gate valve. The gate valve can control the opening by limiting.

3. The automatic feeding control device for ultrafine powders according to claim 1, characterized in that: The upper part of the buffer exhaust silo is an oblong cylinder with a height of 600mm-1000mm and a diameter of 800mm-1200mm. A pressure gauge is installed on the top, and 1-4 cone buckets are connected to the lower part. The cone angle of the cone bucket is 60°-75°. A 200-300mm circular discharge port is provided at the bottom of each cone bucket. Each independent discharge port is provided with a pneumatic butterfly valve connected to the filling bin.

4. The automatic feeding control device for ultrafine powders according to claim 3, characterized in that: A buffer exhaust silo level meter is arranged 500-800mm above the center of each independent discharge port, and the buffer exhaust silo level meter, the pneumatic gate valve and the vibrator are electrically connected.

5. The automatic feeding control device for ultrafine powders according to claim 1, characterized in that: The filling bin is provided with a sight glass and a filling bin material level meter, and a fluidizer is provided at the bottom of the filling bin, through which compressed air with a pressure of 0.03-0.08MPa is delivered to the filling bin.

6. The automatic feeding control device for ultrafine powders according to claim 5, characterized in that: The filling bin level meter and the pneumatic butterfly valve are interlocked and controlled by PLC.

7. The automatic feeding control device for ultrafine powders according to claim 1, characterized in that: The pulse pipeline is vertically inserted into the center of the filter element and is provided with multi-angle three-dimensionally distributed air holes. The pressure of the compressed air in the compressed air tank is 0.3-0.4MPa.

Images