Continuous powder material injection range-increasing ultrafine pulverizing system

Abstract

The application discloses a continuous powder material jetting range-increasing ultrafine pulverizing system and belongs to the technical field of micro-nano powder material pulverizing and preparation. The system comprises a vacuum feeding machine, a powder material storage bin connected with the outlet of the vacuum feeding machine, a feeding rotary valve, a two-way micro-powder crusher and a double-spiral feeding machine which are sequentially and flange-fixedly connected with the outlet of the material storage bin, and the two-way micro-powder crusher comprises a sleeve, an inner layer crushing cylinder and an outer layer crushing cylinder which are rotatably arranged in the sleeve. The high-speed airflow jetting pulverizer comprises sequentially connected incident tubes, nozzles, mixing tubes, throat tubes and diffusion tubes, the mixing tube is provided with a mixing cavity, the mixing tube is provided with an ejector pipe, the diffusion tube is provided with a gradually expanding diffusion cavity, the diffusion tube is provided with a booster interface, the diffusion tube is a discharge port, and the ejecting port of the ejector pipe is flexibly connected with the outlet of the double-spiral feeding machine. The millimeter-level particle powder material can be pulverized to the micro-nano level through the two-way micro-powder crushing and high-speed airflow jetting pulverizing mode.

Description

Technical Field

[0001] This invention belongs to the field of micro- and nano-scale powder material pulverization and preparation technology, and particularly relates to a continuous powder material jet range-extending ultra-micro pulverization system. Background Technology

[0002] Airflow milling is an important technology for processing micro and nano powders, and it currently exists in various forms within the industry. However, these airflow milling methods suffer from low energy utilization and poor collision and shear crushing effects. Even with staged reflux, rapid milling cannot be achieved to maintain the same crushing effect. In actual production, only batch milling is possible, resulting in process lag. This fails to meet the needs of continuous production and significantly reduces production efficiency.

[0003] To ensure continuous production, many companies currently use multiple air jet mills operating simultaneously, which significantly increases equipment costs, energy consumption, and maintenance costs. Furthermore, the pulverized material requires separate conveying equipment to transport it to the next production stage, further increasing operating costs and resulting in low production efficiency. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A continuous powder material jet range-extending ultrafine pulverization system includes: Vacuum feeder; The powder material storage bin is connected to the outlet of the vacuum feeder; The outlet of the powder material storage silo is sequentially flanged and fixedly connected to a feeding rotary valve, a bidirectional micro powder crusher, and a twin-screw feeder; the bidirectional micro powder crusher includes a sleeve, an inner crushing cylinder and an outer crushing cylinder rotatably disposed within the sleeve, the outer crushing cylinder being sleeved outside the inner crushing cylinder, and the inner crushing cylinder and the outer crushing cylinder rotating in opposite directions. A high-speed airflow jet pulverizer includes an injection pipe, a nozzle, a mixing pipe, a throat pipe, and a diffuser pipe connected in sequence. The mixing pipe has a converging mixing chamber and an ejector pipe communicating with the mixing chamber. The diffuser pipe has a gradually expanding diffusion chamber and a pressurization port communicating with the diffusion chamber. The diffuser pipe is a discharge port, and the ejector port of the ejector pipe is flexibly connected to the outlet of the twin-helix feeder. In this process, a pressurized air source is used as the incident fluid source. The fluid passes through the injection pipe and the nozzle in sequence, creating a negative pressure in the mixing chamber. The particulate powder material is then drawn in through the ejector pipe as the ejector fluid. After being uniformly mixed, the fluid enters the throat at high speed, where it collides and undergoes primary crushing. The mixed fluid then enters the diffuser pipe, where the pressure increases. Compressed air is injected through the pressurization port on the diffuser pipe to locally increase the pressure. After pressurization, a stable vortex is formed, resulting in secondary crushing. The crushed mixed fluid is then transported to the collection end through a conveying pipe, where it is dusted and collected separately.

[0005] Furthermore, at least one airflow extender is installed on the conveying pipeline to extend and accelerate the powder flow. The airflow extender extends and accelerates the powder flow, and crushes the powder by means of collision and friction between the powder particles. The material after at least one extension crushing passes through the conveying pipeline into the collection end, and is collected separately after dust removal.

[0006] Furthermore, the calculation model for the airflow range extender is as follows: ——— ① ——— ② Formula ① is for the analysis of the outlet velocity of the airflow range extender: where, P 1 represents the outlet pressure (Pa) of the airflow extender. P 2 represents the pressure at the end of the delivery point (Pa). V 1 represents the fluid velocity (m / s) at the outlet point of the airflow extender. V 2 represents the velocity of the mixed fluid at the end of the delivery point (m / s), ρ1 represents the density of air (kg / m³), and ρ2 represents the density of the mixed fluid (kg / m³). f 2 represents the head loss (Pa) at the end of the pipeline; since the solid-gas ratio is small due to the dilute phase transport, ρ1=ρ2 is taken as an ideal condition, and the speed requirement of the airflow extender is calculated. V 1, i.e., formula ②; ——— ③ ——— ④ Formula ③ is for the analysis of the outlet area of ​​the airflow range extender; where, P 3 represents the pressure of the delivery pipeline (Pa). S The outlet area (m²) of the airflow range extender. A The area of ​​the pipeline is measured in square meters (m²). C A The entrainment ratio coefficient typically ranges from 1 to 15. Calculate the area S at the outlet of the airflow extender; that is, formula ④. ——— ⑤ Formula ⑤ is for the analysis of the outlet length of the airflow extender; where, R e The Reynolds number ranges from 2300 to 4000. μ This represents the dynamic viscosity (Pa·s) of the fluid exiting the airflow extender; here, it is the dynamic viscosity of air at a temperature of 20°C. μ =17.17×10^(-6) Pa·s, calculate the length of the airflow range extender outlet channel. L 1; ——— ⑥ Formula ⑥ is for analyzing the outlet area of ​​the airflow extender; where M is the mass of the powder flow (kg / s), and the outlet area of ​​the airflow extender is calculated. S 2; ——— ⑦ Formula ⑦ is for analyzing the length of the airflow extender; where φ is the incident angle of the airflow extender's outlet, typically taken as 5°-15°, to calculate the total length of the airflow extender. L 2; ——— ⑧ Formula ⑧ is for the analysis of the inlet length of the airflow range extender; where, C B This is the inlet length coefficient for the airflow extender, typically ranging from 0.1 to 1. The inlet length of the airflow extender is then calculated. L 3; Based on the density and suspension velocity of the material to be crushed and the diameter of the conveying pipe, and using the formulas ①, ②, ③, ④, ⑤, ⑥, ⑦, and ⑧ above, the outlet area S of the airflow extender and the length of the outlet flow channel are obtained respectively. L 1. Air outlet area S 2. Total length L 2 and import length L 3.

[0007] Furthermore, it also includes: a feeding fan and a suction device, wherein the feeding fan provides kinetic energy to the powder material to be pulverized, and the feeding fan draws the powder material to be pulverized into the vacuum feeder through the suction device and the suction pipe; the vacuum feeder delivers the powder material into the powder material storage bin through the feeding pipe; The powder material storage silo is equipped with a level gauge to detect the material inside the silo.

[0008] Furthermore, the double-helix feeder is located at the outlet of the powder material storage bin. The double-helix feeder adopts an embedded double-helix structure, uses gears as transmission, and is controlled by loss-in-weight metering. By collecting the weight loss per unit time, the feeding rate of the double-helix feeder is calculated, and the actual feeding rate is compared with the set target feeding rate, thereby providing feedback control to adjust the output of the double-helix feeder, providing the required amount of material for continuous conveying and continuous crushing of powder materials. The bottom support of the powder material storage silo is equipped with a silo weighing system that is linked to the twin-screw feeder for weight accuracy control.

[0009] Furthermore, the collection end includes: A gas-solid separator and a centrifugal dust collector are connected in sequence to the discharge port of the high-speed air jet pulverizer to collect the pulverized materials separately. The solid outlet of the gas-solid separator is equipped with a collection rotary valve, and the discharge port of the centrifugal dust collector is equipped with a dust removal rotary valve. The dual-inlet conveying spiral is provided, and both the collecting rotary valve and the dust removal rotary valve are connected to the inlet of the dual-inlet conveying spiral.

[0010] Furthermore, the gas-solid separator is located at the collection point at the end of the conveying pipeline, and a powder inlet is provided at the tangential position of the upper cylinder of the gas-solid separator; a spiral guide groove is provided inside the gas-solid separator, an air outlet is provided at the center of the top, and the collection rotary valve is installed at the bottom.

[0011] Furthermore, the dust collector includes a dust collector cylinder, an air inlet is provided in the upper middle part of the dust collector cylinder, a centrifugal fan is provided at the top, and an exhaust duct is connected to the exhaust port of the centrifugal fan; a dust collector filter element is installed inside the dust collector cylinder; and a dust collector rotary valve is installed at the lower end of the dust collector.

[0012] Furthermore, the two feed inlets of the dual-inlet conveying screw are connected by flanges and are respectively connected to the outlets of the collecting rotary valve and the dust removal rotary valve; the conveying screw of the dual-inlet conveying screw is a single screw, an airflow balancer is installed at the front end of the dual-inlet conveying screw, and the outlet of the dual-inlet conveying screw is connected to a collecting bucket or collecting bag.

[0013] Furthermore, the pressure gas source is a pressurized gas or a high-pressure compressed gas with a pressure of not less than 0.5 MPa.

[0014] Beneficial effects: 1. The present invention provides a continuous powder material jet range-extending ultrafine pulverization system, which is a continuous and uninterrupted pulverization system that can pulverize millimeter-sized powder materials to the micro-nano level through bidirectional micro-powder crushing and high-speed airflow jet pulverization; wherein, the powder material to be pulverized can be continuously fed into the ultrafine pulverization conveying system for continuous crushing, with fast pulverization speed and high efficiency.

[0015] 2. The present invention provides a continuous powder material jet range-extending ultrafine pulverization system that integrates powder material pulverization and conveying into one unit. Through the first-stage ejector mixing and the second-stage local pressure crushing of the high-speed airflow jet pulverizer, efficient pulverization of materials can be achieved. The airflow range extender on the conveying pipeline can convert pressure into kinetic energy to accelerate the flow of pulverized powder, causing the material to accelerate its movement, collide, rub, and shear each other within the limited conveying pipeline, thereby quickly completing the pulverization during the conveying process. This improves efficiency, reduces the number of equipment and operating and maintenance costs, and also greatly reduces energy consumption.

[0016] 3. The continuous powder material jet extended range ultrafine pulverization system provided by the present invention adopts an airflow range extender. During use, the number of airflow range extenders can be flexibly adjusted according to the particle size pulverization requirements to meet the pulverization requirements. It also eliminates the need for repeated pulverization, reduces production process steps, improves production efficiency, and effectively controls energy consumption.

[0017] 4. The continuous powder material jet extended range ultrafine pulverization system provided by the present invention has a remote conveying function, which can directly convey the pulverized finished material to the terminal position according to the actual working conditions, reducing production links, reducing the number of equipment, and improving work efficiency.

[0018] 5. The continuous powder material jet extended range ultrafine pulverization system provided by the present invention eliminates the need for a classification device, reduces the number of motors, lowers the energy consumption of the system equipment, and reduces operating costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a continuous powder material jet range-extending ultrafine pulverization system according to the present invention; Figure 2 This is a schematic diagram of the structure of a two-way micro powder crusher; Figure 3 This is a schematic diagram of the structure of a high-speed jet crusher; Figure 4 This is a front view schematic diagram of the airflow range extender; Figure 5 This is a cross-sectional schematic diagram of an airflow range extender; Figure 6 This is a schematic diagram of the inner crushing cylinder. Figure 7 This is a schematic diagram of the outer crushing cylinder; In the diagram: 1. Feeding blower; 2. Powder material storage silo; 3. Vacuum feeder; 4. Suction device; 5. Feeding rotary valve; 6. Two-way micro powder crusher; 6-1. Motor; 6-2. Transmission structure; 6-3. Base; 6-4. Sleeve; 6-5. Feed pipe; 6-6. Inner crushing cylinder; 6-7. Outer crushing cylinder; 6-8. Collection bin discharge pipe; 6-9. Shaft seal; 6-10. Water cooling system; 7. Double helix feeder; 8. Roots blower; 9. Weighing sensor; 10. High-speed airflow jet pulverizer; 10-1. Injection pipe; 10-2. Nozzle; 10-3 10-4 Mixing tube; 10-5 Throat tube; 10-6 Diffuser tube; 10-7 Front pressure transmitter interface; 10-8 Ejector tube; 10-9 Vacuum pressure transmitter interface; 10-10 Rear pressure transmitter interface; 11 Quick discharge pneumatic valve; 12 Airflow range extender; 12-1 Feed inlet; 12-2 Air inlet; 12-3 Air outlet; 12-4 Accelerated crushing chamber; 12-5 Discharge outlet; 13 Gas-solid separator; 14 Collection rotary valve; 15 Dust collector; 16 Dust collector rotary valve; 17 Double inlet conveying screw. Detailed Implementation

[0020] Example 1

[0021] refer to Figure 1 - Figure 2 A continuous powder material jet range-extending ultrafine pulverization system, comprising: Vacuum feeder 3; The powder material storage bin 2 is connected to the outlet of the vacuum feeder 3; The outlet of the powder material storage silo 2 is sequentially flange-connected to the feeding rotary valve 5, the bidirectional micro powder crusher 6, and the twin-screw feeder 7. The twin-screw feeder 7 is an embedded precision metering twin-screw feeder. The bidirectional micro powder crusher 6 includes a sleeve, an inner crushing cylinder and an outer crushing cylinder rotatably disposed in the sleeve. The outer crushing cylinder is sleeved on the outside of the inner crushing cylinder, and the inner crushing cylinder and the outer crushing cylinder rotate in opposite directions. The high-speed airflow jet pulverizer 10 includes an injection pipe 10-1, a nozzle 10-2, a mixing pipe 10-3, a throat pipe 10-4, and a diffuser pipe 10-5 connected in sequence. The mixing pipe 10-3 has a constricted mixing chamber. An ejector pipe 10-7 communicating with the mixing chamber is provided on the mixing pipe 10-3. The diffuser pipe 10-5 has a straight cavity and a gradually expanding diffuser cavity. The straight cavity is located on one side of the throat pipe 10-4. A pressurization port 10-9 communicating with the diffuser cavity is provided on the straight cavity section of the diffuser pipe 10-5. The diffuser pipe 10-5 is the discharge port. The ejector port of the ejector pipe 10-7 is flexibly connected to the outlet of the twin-helix feeder 7. In this process, a pressurized air source is used as the incident fluid source. The fluid passes through the injection pipe 10-1 and the nozzle 10-2 in sequence, forming a negative pressure in the mixing chamber. The particulate powder material is then drawn in through the ejector pipe 10-7 as the ejector fluid. After being uniformly mixed, the fluid enters the throat pipe 10-4 at high speed, where it collides and undergoes primary crushing. The mixed fluid then enters the diffuser pipe 10-5, where the pressure increases. Compressed air is injected through the pressurization port 10-9 on the diffuser pipe 10-5 to locally increase the pressure. After pressurization, a stable vortex is formed, and secondary crushing occurs. The crushed mixed fluid is then transported to the collection end, where it is dusted and collected separately.

[0022] In this embodiment, the high-speed airflow jet pulverizer 10 adopts the Venturi principle and uses a pressure gas source as the incident fluid gas source to achieve two-stage crushing, namely primary crushing and secondary crushing. The incident pipe 10-1 is provided with a front pressure transmitter interface 10-6, the mixing pipe 10-3 is provided with a vacuum pressure transmitter interface 10-8, and the diffuser pipe 10-5 is provided with a rear pressure transmitter interface 10-10 in the gradually expanding cavity section.

[0023] The bidirectional micro powder crusher 6 provided in this embodiment also includes: a motor 6-1, a transmission structure 6-2, and a base 6-3. The motor 6-1 and the transmission structure 6-2 are mounted on the base 6-3. The input end of the transmission structure 6-2 is drivenly connected to the output end of the motor 6-1. The transmission structure 6-2 includes a first bevel gear and a second bevel gear arranged opposite to each other, and a third bevel gear that meshes with the first and second bevel gears simultaneously. The first bevel gear is fixedly mounted on the input shaft of the transmission structure 6-2, and the input shaft passes through the central hole of the second bevel gear and engages with the inner crushing layer. The cylinder is fixedly connected, the second bevel gear is connected to the output shaft, the output shaft is fixedly connected to the outer crushing cylinder, the input shaft is connected to the outer crushing cylinder through shaft seal 6-9, and the output shaft is connected to the connecting flange located on the outside of the sleeve through shaft seal 6-9; a feed pipe 6-5 is provided on the upper part of the sleeve near the motor 6-1, and a collection bin discharge pipe 6-8 is provided on the end away from the motor 6-1; a cooling pipe is provided on the inner wall of the sleeve, and the cooling pipe and shaft seal are connected to a water cooling system to cool the transmission mechanism 6-2 and greatly increase the system life.

[0024] The working principle of the bidirectional micro powder crusher 6 is as follows: After the granular material is conveyed into the bidirectional micro powder crusher 6 through the manual gate valve, the granular material undergoes rotational centrifugal motion under the centrifugal action of the rotating inner crushing cylinder and the outer crushing cylinder. Due to the different centrifugal forces caused by mass, different movement speeds are generated. Large particles are subjected to centripetal force and their movement radius expands, resulting in crushing through cylinder sleeve collision shearing, outer wall collision shearing, and particle collision between the cylinder sleeve and the outer wall of the rotating outer crushing cylinder. Small particles have a shrinking movement radius and enter the middle layer after passing through the flow channel on the rotating outer crushing cylinder. They are then crushed through outer wall collision shearing, inner wall collision shearing, and particle collision between the inner wall of the rotating outer crushing cylinder and the outer wall of the inner crushing cylinder. After the granular material is crushed to the micron level, it enters the inner layer after passing through the flow channel on the rotating inner crushing cylinder. It is then drawn into the collection bin discharge pipe located at the center of the cylinder sleeve outlet by the negative pressure source (the near-vacuum negative pressure generated by the high-speed airflow jet pulverizer) on the side of the collection bin discharge pipe and conveyed to the double screw feeder 7.

[0025] In this embodiment, at least one airflow extender 12 is installed on the conveying pipeline to extend and accelerate the powder flow. The airflow extender 12 extends and accelerates the powder flow, and crushes the powder by means of collision and friction between the powder particles. The material after at least one extension crushing passes through the conveying pipeline into the collection end, and is collected separately after dust removal.

[0026] Specifically, the airflow extender 12 is connected to the conveying pipe at the rear end of the outlet of the high-speed airflow jet pulverizer, such as... Figures 4-5 The powder flow in the conveying pipeline enters the accelerating pulverizing chamber 12-4 of the airflow range extender 12 through the inlet 12-1. High-pressure gas enters the airflow range extender 12 through the outlet 12-3, accelerating the powder flow from the inlet 12-1 within the accelerating pulverizing chamber 12-4. This causes the powder material to rapidly expand in volume, decrease in pressure, and increase in velocity within the conveying pipeline, rapidly converting pressure energy into kinetic energy. Under the action of high-speed kinetic energy, the material is rapidly pulverized through collision, friction, and shearing. The airflow range extenders 12 are evenly distributed along the conveying pipeline to achieve pulverization during the conveying process. The pulverized powder flow is connected to the conveying pipeline through the outlet 12-5.

[0027] In this embodiment, the calculation model for the airflow range extender is as follows: ——— ① ——— ② Formula ① is for the analysis of the outlet velocity of the airflow range extender: where, P 1 represents the outlet pressure (Pa) of the airflow extender. P2 represents the pressure at the end of the delivery point (Pa). V 1 represents the fluid velocity (m / s) at the outlet point of the airflow extender. V 2 represents the velocity of the mixed fluid at the end of the delivery point (m / s), ρ1 represents the density of air (kg / m³), and ρ2 represents the density of the mixed fluid (kg / m³). f 2 represents the head loss (Pa) at the end of the pipeline; since the solid-gas ratio is small due to the dilute phase transport, ρ1=ρ2 is taken as an ideal condition, and the speed requirement of the airflow extender 12 is calculated. V 1, i.e., formula ②; ——— ③ ——— ④ Formula ③ is for the analysis of the outlet area of ​​the airflow range extender; where, P 3 represents the pressure of the delivery pipeline (Pa). S The outlet area (m²) of the airflow range extender. A The area of ​​the pipeline is measured in square meters (m²). C A The entrainment ratio coefficient typically ranges from 1 to 15. Calculate the area S at the outlet of the airflow extender; that is, formula ④. ——— ⑤ Formula ⑤ is for the analysis of the outlet length of the airflow extender; where, R e The Reynolds number ranges from 2300 to 4000. μ This represents the dynamic viscosity (Pa·s) of the fluid exiting the airflow extender; here, it is the dynamic viscosity of air at a temperature of 20°C. μ =17.17×10^(-6) Pa·s, calculate the length of the airflow range extender outlet channel. L 1; ——— ⑥ Formula ⑥ is for analyzing the outlet area of ​​the airflow extender; where M is the mass of the powder flow (kg / s), and the outlet area of ​​the airflow extender is calculated. S 2; ——— ⑦ Formula ⑦ is for the length analysis of the airflow extender; where φ is the incident angle of the airflow extender outlet, usually taken as 5°-15°, to calculate the total length of the airflow extender 12. L 2; ——— ⑧ Formula ⑧ is for the analysis of the inlet length of the airflow range extender; where,C B This is the inlet length coefficient for the airflow extender, typically ranging from 0.1 to 1. The inlet length of the airflow extender is then calculated. L 3; Based on the density and suspension velocity of the material to be crushed and the diameter of the conveying pipe, and using the formulas ①, ②, ③, ④, ⑤, ⑥, ⑦, and ⑧ above, the outlet area S of the airflow extender and the length of the outlet flow channel are obtained respectively. L 1. Air outlet area S 2. Total length L 2 and import length L 3.

[0028] In this embodiment, it also includes: a feeding fan 1 and a suction device 4, wherein the feeding fan 1 provides kinetic energy to the powder material to be crushed, and the feeding fan 1 sucks the powder material to be crushed into the vacuum feeder 3 through the suction device 4 and the suction pipe; the vacuum feeder 3 sends the powder material into the powder material storage bin 2 through the feeding pipe. The powder material storage silo 2 is equipped with a level gauge to detect the material in the silo; when a high level is detected, feeding is stopped.

[0029] In this embodiment, the double helix feeder 7 is located at the outlet of the powder material storage bin 2. The double helix feeder 7 adopts an embedded double helix structure, uses gears as transmission, and is controlled by loss-in-weight metering. By collecting the weight loss per unit time, the feeding rate of the double helix feeder 7 is calculated, and the actual feeding rate is compared with the set target feeding rate, thereby providing feedback control to adjust the output of the double helix feeder 7, providing the required amount of material for continuous conveying and continuous crushing of powder materials. The bottom support of the powder material storage silo 2 is equipped with a silo weighing system that is linked with the twin-screw feeder 7 for weight accuracy control.

[0030] In this embodiment, the collection end includes: A gas-solid separator 13 and a centrifugal dust collector 15 are connected in sequence to the discharge port of the high-speed air jet pulverizer to collect the pulverized materials separately. The solid outlet of the gas-solid separator 13 is equipped with a collection rotary valve 14, and the discharge port of the centrifugal dust collector 15 is equipped with a dust removal rotary valve 16. The dual-inlet conveying screw 17, the collecting rotary valve 14, and the dust removal rotary valve 16 are all connected to the inlet of the dual-inlet conveying screw 17.

[0031] In this embodiment, the gas-solid separator 13 is located at the collection point at the end of the conveying pipeline, and a powder flow inlet is provided at the tangential position of the upper cylinder of the gas-solid separator 13; a spiral guide groove is provided inside the gas-solid separator 13, an air outlet is provided at the center of the top, and a collection rotary valve 14 is installed at the bottom.

[0032] In this embodiment, the dust collector 15 includes a dust collector cylinder, an air inlet is provided in the upper middle part of the dust collector cylinder, a centrifugal fan is provided at the top, and an exhaust pipe is connected to the exhaust port of the centrifugal fan; a dust collector filter element is installed inside the dust collector cylinder; and a dust collector rotary valve 16 is installed at the lower end of the dust collector 15.

[0033] In this embodiment, the two feed ports of the dual-inlet conveying screw 17 are connected by flanges and are respectively connected to the outlets of the collecting rotary valve 14 and the dust removal rotary valve 16; the conveying screw of the dual-inlet conveying screw 17 is a single screw, an airflow balancer is installed at the front end of the dual-inlet conveying screw 17, and the outlet of the dual-inlet conveying screw 17 is connected to the collecting bucket or collecting bag.

[0034] In this embodiment, the pressure gas source is the pressure gas provided by the Roots blower 8 or the high-pressure compressed gas of not less than 0.5 MPa.

[0035] Example 2

[0036] This embodiment is a further modification based on the continuous powder material jet range-extending ultrafine pulverization system provided in Embodiment 1.

[0037] A continuous powder material jet extended range ultrafine pulverization system includes a feeder 4 connected to the inlet of a vacuum feeder 3 via a feed pipe; the vacuum feeder 3 connected to the inlet of a powder material storage silo 2 via a feed pipe; the powder material storage silo 2 is conical, with a mechanical arch-breaking device and multiple sets of pneumatic arch-breaking devices installed on the inner wall of the cone; the multiple sets of pneumatic arch-breaking devices are connected to a high-pressure air source; a weighing sensor 9 is installed between the outer wall of the powder material storage silo 2 and the silo support legs, and multiple sets of level gauges are provided on the outer wall of the storage silo; the outlet of the powder material storage silo 2 is sequentially connected to a rotary valve 5, a bidirectional micro-powder crusher 6, and a twin-screw feeder 7; the outlet of the twin-screw feeder 7 is connected to the inlet of a fast-discharge pneumatic valve 11 via a flexible connection, and the outlet of the fast-discharge pneumatic valve 11 is connected to the inlet of a high-speed airflow jet pulverizer 10.

[0038] The outlet of the Roots blower 8 is connected to the working fluid inlet of the high-speed air jet pulverizer 10 via a pipeline. The outlet of the high-speed air jet pulverizer 10 is connected to the inlet of the gas-solid separator 13 via a conveying pipeline. An airflow extender 12 is installed on the conveying pipeline. The outlet of the gas-solid separator 13 is connected to the inlet of the collecting rotary valve 14. The outlet of the collecting rotary valve 14 is connected to the feed inlet flange of the double-inlet conveying screw 17. The outlet of the gas-solid separator 13 is connected to the inlet of the dust collector 15. The outlet of the ash hopper at the bottom of the dust collector cylinder is connected to the inlet of the dust collector rotary valve 16. The outlet of the dust collector rotary valve 16 is connected to the feed inlet of the double-inlet conveying screw 17.

[0039] The discharge port of the dual-inlet conveying screw 17 is equipped with a quick-connect coupling, which can directly collect the material into the storage bin of the next stage, or connect it to the material collection bag through the quick-connect coupling.

[0040] Specifically, the powder material to be crushed is fed into the vacuum feeder 3 through the suction pipe via the suction pipe using the kinetic energy provided by the feeding fan 1; the vacuum feeder 3 sends the powder material into the powder material storage bin 2 through the feeding pipe; the level gauge installed on the powder material storage bin 2 detects the material in the bin, and stops feeding when a high level is detected.

[0041] The Roots blower 8 serves as the power source for the conveying and pulverizing system, providing sufficient power for the continuous powder material jet ultrafine pulverizing system. When the Roots blower 8 is started, the system will automatically detect the working flow field state inside the high-speed airflow jet pulverizer 10, and open the fast pneumatic valve 11 for material discharge when the system operation requirements are met.

[0042] The twin-screw feeder 7 feeds the powder material in the powder material storage bin 2 through the feeding fast pneumatic valve 11 and the feed port of the high-speed air jet pulverizer 10 into the mass transfer chamber of the high-speed air jet pulverizer 10, and then through the outlet of the high-speed air jet pulverizer 10, it enters the conveying pipeline after ejector crushing and pressurization crushing.

[0043] In this embodiment, three airflow extenders 12 are installed on the delivery pipeline, and the end pipeline is connected to the air inlet of the gas-solid separator 13. One, two, or more airflow extenders 12 can be installed according to actual usage needs.

[0044] The inner wall of the cone-shaped powder material storage silo 2 is equipped with a mechanical arch-breaking device and multiple sets of pneumatic arch-breaking devices to assist the powder material in the silo in smoothly entering the feed inlet of the twin-screw feeder 7.

[0045] In this embodiment, the control method of the double helix feeder 7 adopts a weightlessness control method that uses PID adjustment to adjust the rotation speed of the double helix feeder 7 based on the change in the amount of material reduction in the powder material storage bin 2 detected in real time by the weighing sensor 9 and the target amount of conveying and crushing set by the user.

[0046] Specifically, the gas-solid separator 13 is connected to the air inlet of the conveying pipe and the outlet of the gas-solid separator 13. The lower part of the gas-solid separator 13 is set with a cone structure for collecting the crushed finished material. The outlet of the gas-solid separator 13 is connected to a collection rotary valve 14.

[0047] In this embodiment, the top exhaust port of the gas-solid separator 13 is connected to the air inlet of the dust collector 15 through a pipe. The lower part of the dust collector 15 is used to collect the powder material after it has been filtered by the dust collector filter element, and its outlet is connected to the dust collector rotary valve 16.

[0048] In this embodiment, the outlets of the collecting rotary valve 14 and the dust removal rotary valve 16 are respectively connected to the two inlets of the double-inlet conveying screw 17, and the outlet of the double-inlet conveying screw 17 is connected to the material collection bucket or material collection bag through a quick-connect coupling.

[0049] Specifically, the airflow extender 12 is connected to the conveying pipe at the rear end of the outlet of the high-speed airflow jet pulverizer 10. The powder flow in the conveying pipe enters the acceleration pulverization chamber 12-4 of the airflow extender 12 through the feed port 12-1. High-pressure gas is introduced from the air inlet 12-2 of the airflow extender 12, through the outlet 12-3, and accelerates the powder flow from the feed port 12-1 in the acceleration pulverization chamber 12-4. This causes the powder material to expand rapidly in volume, decrease in pressure, and increase in flow velocity in the conveying pipe, and the pressure energy is rapidly converted into kinetic energy. Under the action of high-speed kinetic energy, the material is rapidly pulverized by mutual collision, friction, and shearing.

[0050] Airflow extenders 12 are evenly distributed on the conveying pipeline to achieve pulverization of powder materials during the conveying process. The pulverized powder flows through the discharge port 12-5 and is connected to the conveying pipeline.

[0051] This invention provides a continuous powder material jet extended range ultrafine pulverization system, which can perform continuous powder material jet extended range ultrafine pulverization during the conveying process. The system is an airflow pulverization system that integrates continuous feeding of powder material, long-distance conveying, extended range ultrafine pulverization, and collection of finished powder material.

[0052] In addition, the present invention adopts a continuous range-extending pulverization method. The material to be pulverized can be continuously fed into the system by the internal feeding system for pulverization, which can meet the requirements of continuous production of enterprises. There is no need to use multiple devices at the same time, which saves the purchase cost and maintenance cost of equipment, while also reducing the energy consumption of enterprises.

[0053] Furthermore, the present invention employs continuous extended-range pulverization technology within a pipeline, thus allowing the pulverized finished product to be directly transported to the end user without the need for separate conveying equipment. This reduces equipment and operating costs while also lowering production energy consumption.

[0054] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A continuous powder material jet extended-range ultrafine pulverization system, characterized in that, include: Vacuum feeder; The powder material storage bin is connected to the outlet of the vacuum feeder; The outlet of the powder material storage silo is sequentially flanged and fixedly connected to a feeding rotary valve, a bidirectional micro powder crusher, and a twin-screw feeder; the bidirectional micro powder crusher includes a sleeve, an inner crushing cylinder and an outer crushing cylinder rotatably disposed within the sleeve, the outer crushing cylinder being sleeved outside the inner crushing cylinder, and the inner crushing cylinder and the outer crushing cylinder rotating in opposite directions. A high-speed airflow jet pulverizer includes an injection pipe, a nozzle, a mixing pipe, a throat pipe, and a diffuser pipe connected in sequence. The mixing pipe has a converging mixing chamber, and an ejector pipe communicating with the mixing chamber is provided on the mixing pipe. The diffuser pipe has a straight cavity and a gradually expanding diffuser cavity, wherein the straight cavity is located on one side of the throat pipe, and a pressurization port communicating with the diffuser cavity is provided on the straight cavity section of the diffuser pipe. The diffuser pipe is a discharge port, and the ejector port of the ejector pipe is flexibly connected to the outlet of the twin-helix feeder. In this process, a pressurized air source is used as the incident fluid source. The fluid passes through the injection pipe and the nozzle in sequence, creating a negative pressure in the mixing chamber. The particulate powder material is then drawn in through the ejector pipe as the ejector fluid. After being uniformly mixed, the fluid enters the throat at high speed, where it collides and undergoes primary crushing. The mixed fluid then enters the diffuser pipe, where the pressure increases. Compressed air is injected through the pressurization port on the diffuser pipe to locally increase the pressure, forming a stable vortex and undergoing secondary crushing. After crushing, the mixed fluid is transported to the collection end through a conveying pipe, where it is collected after dust removal. At least one airflow extender is installed on the conveying pipeline to accelerate the flow of powder. The airflow extender is connected to the conveying pipeline at the rear end of the outlet of the high-speed air jet pulverizer. The powder flow in the conveying pipeline enters the acceleration pulverization chamber of the airflow extender through the feed port. High-pressure gas is introduced from the airflow extender through the air outlet and accelerates the powder flow from the feed port in the acceleration pulverization chamber. At least one of the airflow extenders is evenly distributed on the conveying pipeline to achieve pulverization of powder materials during the conveying process. The pulverized powder flow is connected to the conveying pipeline through the discharge port.

2. The continuous powder material jet extended-range ultrafine pulverization system according to claim 1, characterized in that, Also includes: The system includes a feeding fan and a suction device, wherein the feeding fan provides kinetic energy to the powder material to be pulverized, and the feeding fan draws the powder material to be pulverized into the vacuum feeder through the suction device and suction pipe; the vacuum feeder then delivers the powder material into the powder material storage bin through the feeding pipe. The powder material storage silo is equipped with a level gauge to detect the material inside the silo.

3. The continuous powder material jet extended-range ultrafine pulverization system according to claim 1, characterized in that, The twin-helix feeder is located at the outlet of the powder material storage bin. The twin-helix feeder adopts an embedded twin-helix structure, uses gears as transmission, and is controlled by loss-in-weight metering. By collecting the weight loss per unit time, the feeding rate of the twin-helix feeder is calculated, and the actual feeding rate is compared with the set target feeding rate, thereby providing feedback control to adjust the output of the twin-helix feeder, providing the required amount of material for continuous conveying and continuous crushing of powder materials. The bottom support of the powder material storage silo is equipped with a silo weighing system that is linked to the twin-screw feeder for weight accuracy control.

4. The continuous powder material jet extended-range ultrafine pulverizing system according to claim 1, characterized in that, The collection end includes: A gas-solid separator and a centrifugal dust collector are connected in sequence to the discharge port of the high-speed air jet pulverizer to collect the pulverized material separately. The solid outlet of the gas-solid separator is equipped with a collection rotary valve, and the discharge port of the centrifugal dust collector is equipped with a dust removal rotary valve. The dual-inlet conveying spiral is provided, and both the collecting rotary valve and the dust removal rotary valve are connected to the inlet of the dual-inlet conveying spiral.

5. The continuous powder material jet extended-range ultrafine pulverization system according to claim 4, characterized in that, The gas-solid separator is located at the collection point at the end of the conveying pipeline. A powder inlet is provided at the tangential position of the upper cylinder of the gas-solid separator. A spiral guide groove is provided inside the gas-solid separator, an air outlet is provided at the top center position, and the collection rotary valve is installed at the bottom.

6. The continuous powder material jet range-extending ultrafine pulverizing system according to claim 4, characterized in that, The dust collector includes a dust collector cylinder, an air inlet is provided in the upper middle part of the dust collector cylinder, a centrifugal fan is provided at the top, and an exhaust duct is connected to the exhaust port of the centrifugal fan; a dust collector filter element is installed inside the dust collector cylinder; and a dust collector rotary valve is installed at the lower end of the dust collector.

7. The continuous powder material jet extended-range ultrafine pulverization system according to claim 4, characterized in that, The two feed inlets of the dual-inlet conveying screw are connected by flanges and are respectively connected to the outlets of the collecting rotary valve and the dust removal rotary valve; the conveying screw of the dual-inlet conveying screw is a single screw, an airflow balancer is installed at the front end of the dual-inlet conveying screw, and the outlet of the dual-inlet conveying screw is connected to a collecting bucket or collecting bag.

8. The continuous powder material jet extended-range ultrafine pulverization system according to claim 1, characterized in that, The pressure gas source is a pressurized gas or a high-pressure compressed gas of not less than 0.5 MPa.

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