Continuous powder material injection range-extending superfine grinding system

Abstract

The invention discloses a continuous powder material spraying range-extending superfine grinding system, and belongs to the technical field of micro-nano-scale powder material grinding preparation. The powder material storage bin is connected with an outlet of the vacuum feeding machine; an outlet of the material storage bin is fixedly connected with a feeding rotary valve, a two-way micro-powder crusher and a double-helix feeding machine through flanges in sequence; the bidirectional micro powder crusher comprises a sleeve, an inner-layer crushing cylinder and an outer-layer crushing cylinder, wherein the inner-layer crushing cylinder and the outer-layer crushing cylinder are rotatably arranged in the sleeve; the high-speed airflow jet crusher comprises an incidence pipe, a jet nozzle, a mixing pipe, a throat pipe and a diffusion pipe which are sequentially connected, a mixing cavity is formed in the mixing pipe, an injection pipe is arranged on the mixing pipe, the diffusion pipe is provided with a diffusion cavity which is in a gradually-expanding shape, a pressurization connector is arranged on the diffusion pipe, and the diffusion pipe is a discharging port. And an injection port of the injection pipe is flexibly connected with an outlet of the double-helix feeding machine. According to the invention, millimeter-scale particle powder materials can be crushed to micro-nano scale in a bidirectional micro-powder crushing and high-speed airflow jet crushing manner.

Description

Technical Field

[0001] The present invention belongs to the technical field of the crushing and preparation of micro-nano powder materials, and particularly relates to a continuous powder material jet range-increasing ultrafine crushing system. Background Art

[0002] The air flow crushing technology is an important technical means for the processing of micro-nano powders, and there are various forms in the current industry. Due to the low energy utilization rate and poor collision and shear crushing effects of these air flow crushing methods, even with the existence of classification and reflux, rapid crushing cannot be achieved under the premise of achieving the same crushing effect. In actual production, only batch crushing can be carried out, which has process hysteresis and cannot meet the continuous production requirements of enterprises, greatly reducing the production efficiency.

[0003] In order to ensure continuous production, enterprises currently mostly adopt the method of using multiple air flow crushing devices in parallel to meet the working conditions. This greatly increases the equipment cost of enterprises, and also increases the energy consumption and maintenance cost of enterprises. Moreover, the crushed materials require separate conveying equipment to transport the crushed materials to the next production link, increasing the operating cost of enterprises and having a low production efficiency. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A continuous powder material jet range-increasing ultrafine crushing system, comprising:

[0006] A vacuum feeder;

[0007] A powder material storage bin connected to the outlet of the vacuum feeder;

[0008] The outlet of the powder material storage bin is fixedly connected in sequence by a flange to a feeding rotary valve, a two-way fine powder crusher, and a double-screw feeder; the two-way fine powder crusher includes a sleeve, an inner crushing cylinder and an outer crushing cylinder rotatably arranged in the sleeve, the outer crushing cylinder is sleeved outside the inner crushing cylinder, and the inner crushing cylinder and the outer crushing cylinder rotate in opposite directions;

[0009] A high-speed air flow jet crusher, the high-speed air flow jet crusher includes an incident pipe, a nozzle, a mixing pipe, a throat pipe and a diffuser pipe connected in sequence, a mixing cavity arranged in a contracted shape is provided in the mixing pipe, an injection pipe communicating with the mixing cavity is arranged on the mixing pipe, a diffusing cavity arranged in a gradually expanding shape is provided in the diffuser pipe, a pressurizing interface communicating with the diffusing cavity is arranged on the diffuser pipe, the diffuser pipe is the discharge port, and the injection port of the injection pipe is flexibly connected to the outlet of the double-screw feeder;

[0010] Among them, a pressure gas source is used as the incident fluid gas source, which successively passes through the incident pipe and the nozzle, forms a negative pressure in the mixing chamber, sucks in particulate powder materials as the entrained fluid through the entrainment pipe, and enters the throat at a high speed after uniform mixing, where collisions occur and primary crushing is carried out; then the mixed fluid enters the diffuser pipe, the pressure rises, and compressed air is injected through the pressure boosting interface on the diffuser pipe to locally boost the pressure. After boosting, a stable eddy current is formed and secondary crushing is carried out; after crushing, the mixed fluid enters the collection end through the conveying pipeline and is transported to the collection end, and after dust removal, it is separately collected.

[0011] Further, at least one air flow range extender for increasing the range and accelerating the powder flow is installed on the conveying pipeline. At least one air flow range extender increases the range and accelerates the powder flow, and uses the collisions and frictions between powder particles for crushing. After being range-extended and crushed at least once, the material enters the collection end through the conveying pipeline, and is separately collected after dust removal.

[0012] Further, the calculation model of the air flow range extender is specifically as follows:

[0013]

[0014] Formula ① is for analyzing the outlet velocity of the air flow range extender: where P1 is the pressure at the outlet point of the air flow range extender (Pa), P2 is the pressure at the end of the conveying point (Pa), V1 is the fluid velocity at the outlet point of the air flow range extender (m / s), V2 is the velocity of the mixed fluid at the end of the conveying point (m / s), ρ1 is the density of air (kg / m 3 ), ρ2 is the density of the mixed fluid (kg / m 3 ), and f2 is the head loss at the end of the pipeline (Pa); since it is dilute-phase conveying with a small solid-gas ratio, ρ1 = ρ2 is taken as the ideal condition, and the velocity requirement V1 of the air flow range extender is calculated, that is, Formula ②;

[0015]

[0016] Formula ③ is for analyzing the outlet area of the air flow range extender; where P3 is the pressure of the conveying pipeline (Pa), S is the outlet area of the air flow range extender (㎡), and A is the area of the conveying pipeline (㎡); C A is the entrainment ratio coefficient, and its usual value range is 1 - 15. The outlet area S of the air flow range extender is calculated; that is, Formula ④;

[0017]

[0018] Formula ⑤ is for analyzing the length of the air outlet of the air flow range extender; where R eWhen the Reynolds number ranges from 2300 to 4000, μ is the dynamic viscosity (Pa·s) of the fluid at the outlet of the air flow extender. Here, under the condition of a temperature of 20°C, the dynamic viscosity of air μ = 17.17×10^(-6) Pa·s, and the length L1 of the air flow extender's outlet channel is calculated;

[0019]

[0020] Formula ⑥ is for the analysis of the outlet area of the air flow extender; where M is the mass (kg / s) of the powder flow, and the outlet area S2 of the air flow extender is calculated;

[0021]

[0022] Formula ⑦ is for the analysis of the length of the air flow extender; where φ is the incident angle at the outlet of the air flow extender, usually taking values between 5° and 15°, and the total length L2 of the air flow extender is calculated;

[0023] L3 = C B ×L2 ——— ⑧

[0024] Formula ⑧ is for the analysis of the inlet length of the air flow extender; where C B is the inlet length coefficient of the air flow extender, usually taking values between 0.1 and 1, and the inlet length L3 of the air flow extender is calculated;

[0025] According to the density, suspension velocity of the pulverized material to be transported and the diameter of the transport pipeline, the outlet area S, the outlet channel length L1, the outlet area S1, the total length L2 and the inlet length L3 of the air flow extender are obtained respectively by combining the above formulas ①, ②, ③, ④, ⑤, ⑥, ⑦ and ⑧.

[0026] Furthermore, it also includes: a feeding fan and a suction device. Among them, the feeding fan provides kinetic energy for the powder material to be pulverized, and the feeding fan sucks the powder material to be pulverized into the vacuum feeding machine through the suction device and the suction pipeline; the vacuum feeding machine sends the powder material into the powder material storage bin through the feeding pipeline;

[0027] A level gauge is provided on the powder material storage bin to detect the material in the bin.

[0028] Furthermore, the double-helix feeder is located at the outlet of the powder material storage bin. The double-helix feeder adopts an inlaid double-helix structure, uses gears for transmission, and the control method is 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, so as to feedback-control and adjust the discharge amount of the double-helix feeder, providing the required material amount for the continuous conveying and continuous pulverization of powder materials;

[0029] A bin weighing system that is linked with the double-helix feeder for weight accuracy control is installed on the support at the bottom of the powder material storage bin.

[0030] Furthermore, the collection end includes:

[0031] A gas-solid separator and a centrifugal dust collector that are sequentially connected to the discharge port of the high-speed air jet pulverizer to separately collect the pulverized materials;

[0032] A collection rotary valve is arranged at the solid outlet of the gas-solid separator, and a dust removal rotary valve is arranged at the discharge port of the centrifugal dust collector;

[0033] A double-inlet conveying screw, and both the collection rotary valve and the dust removal rotary valve are connected to the inlets of the double-inlet conveying screw.

[0034] Furthermore, the gas-solid separator is located at the collection point at the end of the conveying pipeline. A powder material flow inlet is arranged at the tangential position of the upper cylinder of the gas-solid separator; a spiral guiding groove is arranged inside the gas-solid separator, an air outlet is arranged at the center position of the top, and the collection rotary valve is installed at the lower part.

[0035] Furthermore, the dust collector includes a dust collector cylinder body. An air inlet is arranged in the upper middle part of the dust collector cylinder body, a centrifugal fan is arranged at the top, and the exhaust port of the centrifugal fan is connected with an exhaust pipeline; a dust removal filter element is installed inside the dust collector cylinder body; a dust removal rotary valve is installed at the lower end of the dust collector.

[0036] Furthermore, the two feed inlets of the double-inlet conveying screw are connected by flange and are respectively connected to the outlets of the collection rotary valve and the dust removal rotary valve; the conveying screw of the double-inlet conveying screw is a single-screw type, an air flow balancer is installed at the front end of the double-inlet conveying screw, and the outlet of the double-inlet conveying screw is connected to a collection bucket or a collection bag.

[0037] Furthermore, the pressure air source is pressure gas or high-pressure compressed gas not less than 0.5 MPa.

[0038] Beneficial effects:

[0039] 1. A continuous powder material jet - enhanced range ultrafine pulverization system provided by the present invention is a continuous and non - intermittent pulverization system, which can pulverize millimeter - sized particulate powder materials into micro - nano - sized particles by means of bidirectional micro - powder crushing and high - speed air - jet pulverization. Among them, the powder materials to be pulverized can be continuously fed into the ultrafine pulverization and conveying system for continuous crushing, with a fast pulverization speed and high efficiency.

[0040] 2. A continuous powder material jet - enhanced range ultrafine pulverization system provided by the present invention integrates the pulverization and conveying of powder materials. Through the primary entrainment mixing and secondary local pressure - boosting crushing of the high - speed air - jet pulverizer, efficient pulverization of materials can be achieved. The air - flow range - extender on the conveying pipeline can convert pressure into kinetic energy to increase the speed of the crushed powder flow, enabling the materials to accelerate, collide, rub, and shear against each other within a limited conveying pipeline, so that rapid pulverization is completed during the conveying process. While improving efficiency, it reduces the number of equipment and operation and maintenance costs, and also greatly reduces energy consumption.

[0041] 3. A continuous powder material jet - enhanced range ultrafine pulverization system provided by the present invention adopts an air - flow range - extender, which can, during use, flexibly adjust the number of activated air - flow range - extenders according to the particle - size pulverization requirements to meet the pulverization requirements, without the need for repeated pulverization, reducing the production process steps, improving production efficiency, and effectively controlling energy consumption.

[0042] 4. A continuous powder material jet - enhanced range ultrafine pulverization system provided by the present invention has a remote - conveying function. According to actual working conditions, the pulverized finished materials can be directly conveyed to the terminal position, reducing production links, reducing the number of equipment, and improving work efficiency.

[0043] 5. A continuous powder material jet - enhanced range ultrafine pulverization system provided by the present invention omits the classification device, reduces the number of motors, lowers the energy consumption of the system equipment, and reduces the operation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is the overall structural schematic diagram of a continuous powder material jet - enhanced range ultrafine pulverization system of the present invention;

[0045] Figure 2 is the structural schematic diagram of the bidirectional micro - powder crusher;

[0046] Figure 3 is the structural schematic diagram of the high - speed jet crusher;

[0047] Figure 4 is the front - view structural schematic diagram of the air - flow range - extender;

[0048] Figure 5 is the cross - sectional schematic diagram of the air - flow range - extender;

[0049] Figure 6 It is a schematic structural diagram of the inner broken cylinder;

[0050] Figure 7 It is a schematic structural diagram of the outer broken cylinder;

[0051] In the figure: 1. Feeding fan; 2. Powder material storage bin; 3. Vacuum feeder; 4. Suction device; 5. Feeding rotary valve; 6. Two-way fine powder crusher; 6-1. Motor; 6-2. Transmission structure; 6-3. Base; 6-4. Cylinder sleeve; 6-5. Feed pipe; 6-6. Inner broken cylinder; 6-7. Outer broken cylinder; 6-8. Collection bin discharge pipe; 6-9. Shaft seal; 6-10. Water cooling system; 7. Double-screw feeder; 8. Roots blower; 9. Weighing sensor; 10. High-speed airflow jet mill; 10-1. Inlet pipe; 10-2. Nozzle; 10-3. Mixing pipe; 10-4. Throat pipe; 10-5. Diffuser pipe; 10-6. Front pressure transmitter interface; 10-7. Ejector pipe; 10-8. Vacuum pressure transmitter interface; 10-9. Boosting interface; 10-10. Rear pressure transmitter interface; 11. Quick pneumatic valve for discharging; 12. Airflow 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 removal rotary valve; 17. Double-inlet conveying screw. Specific embodiments

[0052] Example 1

[0053] Reference Figure 1 - Figure 2 , a continuous powder material jet extended-range ultrafine pulverization system, comprising:

[0054] Vacuum feeder 3;

[0055] Powder material storage bin 2 connected to the outlet of vacuum feeder 3;

[0056] The outlet of powder material storage bin 2 is fixedly connected in sequence by flange to feeding rotary valve 5, two-way fine powder crusher 6 and double-screw feeder 7. The double-screw feeder 7 is an inlaid precision metering double-screw feeder; the two-way fine powder crusher 6 includes a sleeve, an inner broken cylinder and an outer broken cylinder rotatably arranged in the sleeve. The outer broken cylinder is sleeved outside the inner broken cylinder, and the inner broken cylinder and the outer broken cylinder rotate in opposite directions;

[0057] High-speed airflow jet mill 10, the high-speed airflow jet mill 10 includes an incident 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. A mixing cavity is arranged in a contracted shape in the mixing pipe 10-3. An ejector pipe 10-7 communicating with the mixing cavity is arranged on the mixing pipe 10-3. The diffuser pipe 10-5 has a straight cavity and a diffuser cavity in a gradually expanding shape. Among them, the straight cavity is located on one side of the throat pipe 10-4. A pressurizing interface 10-9 communicating with the diffuser cavity is arranged 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 double-screw feeder 7;

[0058] Among them, using a pressure gas source as the incident fluid gas source, it passes through the incident pipe 10-1 and the nozzle 10-2 in sequence, forms a negative pressure in the mixing cavity, sucks in particulate powder material as the ejector fluid through the ejector pipe 10-7, enters the throat pipe 10-4 at high speed after uniform mixing, forms a collision and performs primary crushing; then the mixed fluid enters the diffuser pipe 10-5, the pressure rises, and compressed air is injected through the pressurizing interface 10-9 on the diffuser pipe 10-5 to locally pressurize it. After pressurization, a stable eddy current is formed and secondary crushing is performed; after crushing, the mixed fluid is transported to the collection end, and after dust removal, it is collected separately.

[0059] In this embodiment, the high-speed airflow jet mill 10 adopts the Venturi principle, uses a pressure gas source as the incident fluid gas source, and realizes two-stage crushing of primary crushing and secondary crushing; among them, a front pressure transmitter interface 10-6 is arranged on the incident pipe 10-1, a vacuum pressure transmitter interface 10-8 is arranged on the mixing pipe 10-3, and a rear pressure transmitter interface 10-10 is arranged on the gradually expanding cavity section of the diffuser pipe 10-5.

[0060] The two-way micropowder crusher 6 provided in this embodiment further 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 installed on the base 6-3. Among them, the input end of the transmission structure 6-2 is drivingly 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 oppositely, and a third bevel gear meshing with the first bevel gear and the second bevel gear at the same time. The first bevel gear is fixedly installed on the input shaft of the transmission structure 6-2. This input shaft passes through the central hole of the second bevel gear and is fixedly connected to the inner-layer crushing cylinder. The second bevel gear is connected to the output shaft, and this output shaft is fixedly connected to the outer-layer crushing cylinder. The input shaft and the outer-layer crushing cylinder are connected through a shaft seal 6-9. The output shaft and the connecting flange located outside the sleeve are connected through a shaft seal 6-9; a feed pipe 6-5 is arranged on the upper part of one end of the sleeve close to the motor 6-1, a collecting bin discharge pipe 6-8 is arranged on the other end far from the motor 6-1, and a cooling pipeline is arranged on the inner wall of the sleeve. The cooling pipeline and the shaft seal part are connected to the water cooling system to cool the transmission mechanism 6-2 and greatly increase the system life.

[0061] The working principle of the two-way ultrafine crusher 6 is as follows: After the granular material is transported into the two-way ultrafine 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 different centrifugal forces affected by mass, different moving speeds are generated. The large particles are affected by the centripetal force and the moving radius diffuses, and are broken by the collision and shearing of the cylinder sleeve, the collision and shearing of the outer wall of the outer crushing cylinder, and the particle collision between the cylinder sleeve and the rotating outer wall of the outer crushing cylinder; the small particles have a shrinking moving radius, enter the middle layer after passing through the flow channel on the rotating outer crushing cylinder, and are broken by the collision and shearing of the inner wall of the outer crushing cylinder, the collision and shearing of the outer wall of the inner crushing cylinder, and the particle collision between the rotating inner wall of the outer crushing cylinder and the outer wall of the inner crushing cylinder; when 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, and is sucked by the negative pressure source on the side of the discharge pipe of the collection bin (the near-vacuum negative pressure generated by the high-speed air jet mill) and enters the collection bin discharge pipe located at the center of the outlet end of the cylinder sleeve, and is transported to the double-screw dosing machine 7.

[0062] In this embodiment, at least one air flow extender 12 for increasing the range and accelerating the powder flow is installed on the conveying pipeline. At least one air flow extender 12 increases the range and accelerates the powder flow, and uses the collision and friction between the powder particles for crushing. The material after at least one range-increasing crushing enters the collection end through the conveying pipeline, and is separately collected after dust removal.

[0063] Specifically, the air flow extender 12 is connected to the conveying pipeline at the rear end of the outlet of the high-speed air jet mill. As Figure 4 - Figure 5 , the powder flow in the conveying pipeline enters the acceleration and crushing chamber 12-4 of the air flow extender 12 through the feed port 12-1 of the air flow extender 12. The high-pressure gas enters from the air inlet 12-2 of the air flow extender 12, passes through the air outlet 12-3, and increases the range and accelerates the powder flow conveyed from the feed port 12-1 in the acceleration and crushing chamber 12-4, prompting the powder material to rapidly expand in volume, reduce pressure, and increase the flow rate sharply in the conveying pipeline, and the pressure energy is rapidly converted into kinetic energy; under the action of the high-speed kinetic energy, the materials collide, rub, and shear each other and are rapidly crushed. The air flow extenders 12 are evenly distributed on the conveying pipeline to achieve crushing during the conveying process of the powder material. The crushed powder flow is connected to the conveying pipeline through the discharge port 12-5.

[0064] In this embodiment, the calculation model of the air flow extender is specifically as follows:

[0065]

[0066] Formula ① is for the analysis of the outlet velocity of the air flow booster: where P1 is the pressure at the outlet point of the air flow booster (Pa), P2 is the pressure at the end of the conveying point (Pa), V1 is the fluid velocity at the outlet point of the air flow booster (m / s), V2 is the velocity of the mixed fluid at the end of the conveying point (m / s), ρ1 is the density of air (kg / m 3 ), ρ2 is the density of the mixed fluid (kg / m 3 ), and f2 is the head loss at the end of the pipeline (Pa); since it is dilute-phase conveying with a small solid-gas ratio, ρ1 = ρ2 is taken as the ideal condition to calculate the velocity requirement V1 of the air flow booster 12, that is, Formula ②;

[0067]

[0068] Formula ③ is for the analysis of the outlet area of the air flow booster; where P3 is the pressure of the conveying pipeline (Pa), S is the outlet area of the air flow booster (㎡), and A is the area of the conveying pipeline (㎡); C A is the entrainment ratio coefficient, usually in the range of 1 - 15, to calculate the outlet area S of the air flow booster; that is, Formula ④;

[0069]

[0070] Formula ⑤ is for the analysis of the length of the air outlet of the air flow booster; where R e is the Reynolds number, in the range of 2300 - 4000, μ is the dynamic viscosity of the fluid at the outlet of the air flow booster (Pa·s), here under the condition of a temperature of 20°C, the dynamic viscosity of air μ = 17.17×10^(-6) Pa·s, to calculate the length L1 of the air outlet flow channel of the air flow booster;

[0071]

[0072] Formula ⑥ is for the analysis of the area of the air outlet of the air flow booster; where M is the mass of the powder flow (kg / s), to calculate the air outlet area S2 of the air flow booster;

[0073]

[0074] Formula ⑦ is for the analysis of the length of the air flow booster; where φ is the incident angle of the air outlet of the air flow booster, usually in the range of 5° - 15°, to calculate the total length L2 of the air flow booster 12;

[0075] L3 = C B ×L2 ——— ⑧

[0076] Formula ⑧ is for the analysis of the inlet length of the air flow booster; where C Bis the inlet length coefficient of the air flow extender, usually with a value between 0.1 and 1, and the inlet length L3 of the air flow extender is calculated;

[0077] According to the density, suspension velocity of the pulverized material to be conveyed and the pipe diameter of the conveying pipeline, the outlet area S, the outlet passage length L1, the outlet area S1, the total length L2 and the inlet length L3 of the air flow extender are respectively obtained by combining the above formulas ①, ②, ③, ④, ⑤, ⑥, ⑦ and ⑧.

[0078] In this embodiment, it further includes: a feeding fan 1 and a suction feeder 4. Among them, the feeding fan 1 provides kinetic energy for the powder material to be pulverized, and the feeding fan 1 sucks the powder material to be pulverized into the vacuum feeder 3 through the suction feeder 4 and the suction pipeline; the vacuum feeder 3 sends the powder material into the powder material storage bin 2 through the feeding pipeline;

[0079] A level gauge is arranged on the powder material storage bin 2 to detect the material in the bin; when a high level is detected, the feeding is stopped.

[0080] In this embodiment, the double-screw feeder 7 is located at the outlet of the powder material storage bin 2. The double-screw feeder 7 adopts an inlaid double-screw structure, uses a gear as the transmission, and the control method is the weight-loss metering method. By collecting the weight loss per unit time, the feeding rate of the double-screw feeder 7 is calculated, and the actual feeding rate is compared with the set target feeding rate, so as to feedback control and adjust the discharge amount of the double-screw feeder 7 to provide the required material amount for the continuous conveying and continuous pulverization of the powder material;

[0081] A bin weighing system that is linked with the double-screw feeder 7 for weight accuracy control is installed on the bracket at the bottom of the powder material storage bin 2.

[0082] In this embodiment, the collection end includes:

[0083] A gas-solid separator 13 and a centrifugal dust collector 15 that are sequentially connected to the outlet of the high-speed air jet pulverizer to separately collect the pulverized material;

[0084] A collection rotary valve 14 is arranged at the solid outlet of the gas-solid separator 13, and a dust removal rotary valve 16 is arranged at the outlet of the centrifugal dust collector 15;

[0085] A double-inlet conveying screw 17, and both the collection rotary valve 14 and the dust removal rotary valve 16 are connected to the inlet of the double-inlet conveying screw 17.

[0086] In this embodiment, the gas-solid separator 13 is located at the collection point at the end of the conveying pipeline. 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 central position of the top, and a collection rotary valve 14 is installed at the lower part.

[0087] In this embodiment, the dust collector 15 includes a dust collector cylinder body. An air inlet is provided in the upper middle part of the dust collector cylinder body, a centrifugal fan is provided at the top, and an exhaust air duct is connected to the exhaust air outlet of the centrifugal fan. A dust removal filter element is installed inside the dust collector cylinder body. A dust removal rotary valve 16 is installed at the lower end of the dust collector 15.

[0088] In this embodiment, the two feeding ports of the double-inlet conveying screw 17 are connected by flanges and are respectively connected to the outlets of the collection rotary valve 14 and the dust removal rotary valve 16. The conveying screw of the double-inlet conveying screw 17 is a single-screw type. An air flow balancer is installed at the front end of the double-inlet conveying screw 17, and the outlet of the double-inlet conveying screw 17 is connected to a collection bucket or a collection bag.

[0089] In this embodiment, the pressure gas source is the pressure gas provided by the Roots blower 8 or a high-pressure compressed gas not less than 0.5 MPa.

[0090] Embodiment 2

[0091] This embodiment is a further setting based on the continuous powder material injection range-increasing ultrafine pulverization system provided in Embodiment 1.

[0092] A continuous powder material injection range-increasing ultrafine pulverization system includes that the suction feeder 4 is connected to the inlet of the vacuum feeding machine 3 through a suction pipeline; the vacuum feeding machine 3 is connected to the feeding port of the powder material storage bin 2 through a feeding pipeline; the powder material storage bin 2 is conical, and a mechanical arch-breaking device and multiple groups of pneumatic arch-breaking devices are installed on the inner side wall of the conical cylinder; multiple groups of pneumatic arch-breaking devices are connected to a high-pressure gas source; between the outer wall of the powder material storage bin 2 and the bin support legs, a weighing sensor 9 is installed, and multiple groups of level gauges are equipped on the outer wall of the storage bin; the outlet of the powder material storage bin 2 is sequentially connected to a rotary valve 5, a two-way fine powder crusher 6, and a double-screw feeder 7; the outlet of the double-screw feeder 7 is connected to the inlet of the quick-opening pneumatic valve 11 through a flexible connection, and the outlet of the quick-opening pneumatic valve 11 is connected to the feeding port of the high-speed air flow jet pulverizer 10.

[0093] The air outlet of the Roots blower 8 is connected to the working fluid inlet of the high-speed airflow jet mill 10 through a pipeline. The outlet of the high-speed airflow jet mill 10 is connected to the inlet of the gas-solid separator 13 through a conveying pipeline. An airflow extender 12 is installed on the conveying pipeline. The discharge port 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 flange-connected to the feed inlet of the double-inlet conveying screw 17. The air outlet of the gas-solid separator 13 is connected to the air inlet of the dust collector 15. The outlet of the ash hopper at the lower part of the dust collector cylinder is connected to the inlet of the dust removal rotary valve 16. The outlet of the dust removal rotary valve 16 is connected to the feed inlet of the double-inlet conveying screw 17.

[0094] A quick-release joint is installed at the discharge port of the double-inlet conveying screw 17, which can be directly collected into the storage bin of this process step, or can be connected to the material collection bag through this quick-release joint.

[0095] Specifically, the powder material to be pulverized utilizes the kinetic energy provided by the feeding blower 1 and is sucked into the vacuum feeder 3 through the suction pipeline via the suction device 4. The vacuum feeder 3 sends the powder material into the powder material storage bin 2 through the feeding pipeline. 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.

[0096] The Roots blower 8 serves as the power source of the conveying and pulverizing system, providing sufficient power for the continuous powder material jet ultrafine pulverizing system. After the Roots blower 8 is started, the system will automatically detect the state of the working flow field in the high-speed airflow jet mill 10, and open the quick pneumatic valve 11 for feeding when the requirements for system operation are met.

[0097] The double-screw feeder 7 sends the powder material in the powder material storage bin 2 into the mass transfer cavity of the high-speed airflow jet mill 10 through the quick pneumatic valve 11 for feeding and the feed inlet of the high-speed airflow jet mill 10, and then enters the conveying pipeline through the outlet of the high-speed airflow jet mill 10 after jet breaking and pressure-increasing breaking.

[0098] In this embodiment, 3 airflow extenders 12 are installed on the conveying pipeline, and the end pipeline is connected to the air inlet of the gas-solid separator 13;

[0099] According to actual usage needs, 1, 2 or more airflow extenders 12 can be set.

[0100] A mechanical arch-breaking device and multiple groups of pneumatic arch-breaking devices are installed on the inner side wall of the conical cylinder of the powder material storage bin 2 to assist the powder material in the bin to smoothly enter the feed inlet of the double-screw feeder 7.

[0101] In this embodiment, the control mode of the double helix feeder 7 is a loss-in-weight control mode that adjusts the rotation speed of the double helix feeder 7 by PID according to the change in the reduction of the material in the powder material storage bin 2 detected in real time by the weighing sensor 9 and the set conveying and crushing target amount.

[0102] Specifically, the air inlet of the gas-solid separator 13 is connected to the outlet of the conveying pipeline. The lower part of the gas-solid separator 13 is provided with a conical structure for collecting the crushed finished materials. The outlet of the gas-solid separator 13 is connected with a collecting rotary valve 14.

[0103] In this embodiment, the top air outlet of the gas-solid separator 13 is connected to the air inlet of the dust collector 15 through a pipeline. The lower part of the dust collector 15 is used to collect the powder materials filtered by the dust collector filter element, and its outlet is connected with a dust removal rotary valve 16.

[0104] In this embodiment, the outlets of the collecting rotary valve 14 and the dust removal rotary valve 16 are respectively connected to the two feeding ports of the double-inlet conveying screw 17. The outlet of the double-inlet conveying screw 17 is connected to a material collecting bucket or a material collecting bag through a quick connector.

[0105] Specifically, the air flow extender 12 is connected to the conveying pipeline at the rear end of the outlet of the high-speed air jet pulverizer 10. The powder flow in the conveying pipeline enters the acceleration pulverization chamber 12-4 of the air flow extender 12 through the feeding port 12-1 of the air flow extender 12. The high-pressure gas passes through the air inlet 12-2 of the air flow extender 12 and the air outlet 12-3, and performs range extension and acceleration on the powder flow conveyed from the feeding port 12-1 in the acceleration pulverization chamber 12-4, so as to promote the volume of the powder material in the conveying pipeline to expand rapidly, the pressure to decrease, the flow velocity to increase sharply, and the pressure energy to be rapidly converted into kinetic energy; under the action of the high-speed kinetic energy, the materials collide, rub, and shear with each other and are rapidly pulverized.

[0106] The air flow extenders 12 are evenly distributed on the conveying pipeline to realize the pulverization during the conveying process of the powder material. The pulverized powder flow is connected to the conveying pipeline through the outlet 12-5.

[0107] A continuous powder material jet range extension ultrafine pulverization system provided by the present invention is a system that can perform continuous powder material jet range extension ultrafine pulverization on the powder material during the conveying process. This system is an air flow pulverization system that integrates continuous feeding of the powder material, long-distance conveying, range extension ultrafine pulverization, and collection of the powder finished products.

[0108] In addition, the present invention adopts a continuous range - increasing pulverization method. The material to be pulverized can be continuously fed into the system by the feeding system inside the system for pulverization, which can meet the requirements of continuous production of enterprises. There is no need to use multiple devices simultaneously, saving the equipment procurement cost and maintenance cost, and also reducing the energy consumption of enterprises.

[0109] In addition, the present invention adopts a continuous range - increasing pulverization technology carried out in a pipeline. Therefore, the pulverized finished product can be directly transported to the use terminal without a separate transportation device, reducing the equipment cost and operation cost, and also reducing the production energy consumption.

[0110] As described above, it is only a preferred embodiment of the present invention, and does not impose any limitation on the technical scope of the present invention. Therefore, any minor modification, equivalent change, and modification made to the above - mentioned embodiments based on the technical essence of the present invention still belong to the scope of the technical solution of the present invention.

Claims

1. A continuous powder material injection range-increasing ultrafine grinding system, characterized in that Including: Vacuum feeder; Powder material storage bin connected to the outlet of the vacuum feeder; The outlet of the powder material storage bin is fixedly connected to a feeding rotary valve, a two-way fine powder crusher, and a double-screw feeder in sequence by flanges. The two-way fine powder crusher includes a sleeve, an inner crushing cylinder and an outer crushing cylinder rotatably arranged in the sleeve. The outer crushing cylinder is sleeved outside the inner crushing cylinder, and the inner crushing cylinder and the outer crushing cylinder rotate in opposite directions; High-speed air flow jet mill, which includes an incident pipe, a nozzle, a mixing pipe, a throat pipe and a diffuser pipe connected in sequence. The mixing pipe has a mixing cavity arranged in a contracted shape. The mixing pipe is provided with an injection pipe communicating with the mixing cavity. The diffuser pipe has a diffusing cavity arranged in a gradually expanding shape. The diffuser pipe is provided with a pressurizing interface communicating with the diffusing cavity. The diffuser pipe is the discharge port. The injection port of the injection pipe is flexibly connected to the outlet of the double-screw feeder; Wherein, using a pressure air source as the incident fluid air source, it passes through the incident pipe and the nozzle in sequence, forms a negative pressure in the mixing cavity, sucks in particulate powder material as the injection fluid through the injection pipe, uniformly mixes and then enters the throat pipe at high speed, forms collisions and performs primary crushing; then the mixed fluid enters the diffuser pipe, the pressure rises, and compressed air is injected through the pressurizing interface on the diffuser pipe to locally pressurize it. After pressurization, a stable eddy current is formed and secondary crushing is performed; after crushing, the mixed fluid enters the collection end through the conveying pipeline and is transported to the collection end, and after dust removal, it is respectively collected.

2. The continuous powder material jetting extended-range ultrafine pulverization system according to claim 1, wherein At least one air flow extender for increasing the range and accelerating the powder flow is installed on the conveying pipeline. At least one air flow extender increases the range and accelerates the powder flow, and uses the collisions and frictions between powder particles to perform crushing. The material after at least one range-increasing crushing enters the collection end through the conveying pipeline, and is respectively collected after dust removal.

3. The continuous powder material jet extended-range ultrafine pulverization system according to claim 2, characterized in that, The calculation model of the air flow extender is specifically as follows: Formula ① is for the analysis of the outlet velocity of the air flow range extender: where P1 is the pressure at the outlet point of the air flow range extender (Pa), P2 is the pressure at the end of the conveying point (Pa), V1 is the fluid velocity at the outlet point of the air flow range extender (m / s), V2 is the velocity of the mixed fluid at the end of the conveying point (m / s), ρ1 is the density of air (kg / m 3 ), ρ2 is the density of the mixed fluid (kg / m 3 ), and f2 is the head loss at the end of the pipeline (Pa); since it is dilute-phase conveying with a small solid-gas ratio, ρ1 = ρ2 is taken as the ideal condition to calculate the required velocity V1 of the air flow range extender, that is, Formula ②; Formula ③ is for the analysis of the outlet area of the air flow extender; where, P3 is the pressure of the conveying pipeline (Pa), S is the outlet area of the air flow extender (㎡), and A is the area of the conveying pipeline (㎡); C A is the entrainment ratio coefficient, and its usual value range is 1-15. Calculate the outlet area S of the air flow extender; that is, Formula ④; Equation ⑤ is for the analysis of the outlet length of the air flow extender; where R e is the Reynolds number with a value range between 2300 and 4000, μ is the dynamic viscosity of the fluid at the outlet of the air flow extender (Pa·s). Here, under the condition of a temperature of 20°C, the dynamic viscosity of air μ = 17.17×10^(-6) Pa·s, and the length L1 of the flow channel at the outlet of the air flow extender is calculated; Formula ⑥ is for analyzing the outlet area of the air flow extender; where M is the mass of the powder flow (kg / s), and the outlet area S2 of the air flow extender is calculated; Formula ⑦ is for analyzing the length of the air flow extender; where φ is the incident angle of the outlet of the air flow extender, usually taking a value of 5°-15°, and the total length L2 of the air flow extender is calculated; L3 = C B × L2 ——— ⑧ Formula ⑧ is for the analysis of the inlet length of the air flow range extender; where C B is the inlet length coefficient of the air flow range extender, usually taking values between 0.1 and 1, and the inlet length L3 of the air flow range extender is calculated; According to the density, suspension velocity of the powder material to be conveyed and crushed, and the diameter of the conveying pipeline, the outlet area S, the outlet flow channel length L1, the outlet area S1, the total length L2 and the inlet length L3 of the air flow extender are respectively obtained by combining the above formulas ①, ②, ③, ④, ⑤, ⑥, ⑦ and ⑧.

4. The continuous powder material injection range-increasing ultrafine grinding system according to claim 1, characterized in that, Also including: A feeding fan and a suction device. Among them, the feeding fan provides kinetic energy for the powder material to be crushed. The feeding fan sucks the powder material to be crushed into the vacuum feeder through the suction device and the suction pipeline; the vacuum feeder sends the powder material into the powder material storage bin through the feeding pipeline; A level gauge is arranged on the powder material storage bin to detect the material in the bin.

5. The continuous powder material jetting range-increasing ultrafine pulverization system according to claim 1, wherein, The double - helix feeder is located at the outlet of the powder material storage bin. The double - helix feeder adopts an inlaid double - helix structure, uses gears for transmission, and the control method is loss - of - 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, so as to feedback - control and adjust the discharge amount of the double - helix feeder, providing the required material amount for the continuous transportation and continuous pulverization of powder materials; A bin weighing system that is linked with the double - helix feeder for weight accuracy control is installed on the support at the bottom of the powder material storage bin.

6. The continuous powder material jetting range-increasing ultrafine pulverization system according to claim 1, wherein The collection end includes: A gas - solid separator and a centrifugal dust collector that are sequentially connected to the discharge port of the high - speed air - jet pulverizer to separately collect the pulverized materials; A collection rotary valve is provided at the solid outlet of the gas - solid separator, and a dust - removal rotary valve is provided at the discharge port of the centrifugal dust collector; A double - inlet conveying screw, and both the collection rotary valve and the dust - removal rotary valve are connected to the inlet of the double - inlet conveying screw.

7. The continuous powder material jetting extended-range ultrafine pulverization system according to claim 6, wherein, The gas - solid separator is located at the collection point at the end of the conveying pipeline. A powder - flow 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 lower part.

8. The continuous powder material jetting extended-range ultrafine grinding system according to claim 6, wherein 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 the exhaust port of the centrifugal fan is connected to an exhaust pipeline; a dust - removal filter element is installed inside the dust - collector cylinder; a dust - removal rotary valve is installed at the lower end of the dust collector.

9. The continuous powder material jetting range-increasing ultrafine pulverization system according to claim 6, wherein, The two feed inlets of the double - inlet conveying screw are connected by flanges and are respectively connected to the outlets of the collection rotary valve and the dust - removal rotary valve; the conveying screw of the double - inlet conveying screw is a single - helix type, an air - flow balancer is installed at the front end of the double - inlet conveying screw, and the outlet of the double - inlet conveying screw is connected to a collection bucket or a collection bag.

10. The continuous powder material jetting extended-range ultrafine grinding system according to claim 1, characterized in that, The pressure air source is a pressure gas or a high - pressure compressed gas not less than 0.5 MPa.

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