Airflow crushing system with demagnetizing function

Abstract

The invention provides an airflow crushing system with a demagnetizing function, and relates to the technical field of material crushing. The airflow crushing system with the demagnetizing function comprises a feeding system, a main crusher and a demagnetizing system, wherein the feeding system is used for conveying raw materials to the main crusher; the magnetic separation device is used for removing ferromagnetic impurities in the materials and preventing the magnetic impurities from entering the crushing cavity to damage equipment; the air inlet system enables compressed air to be injected into the main pulverizer after being frozen, filtered and dried; the main crusher is provided with a plurality of air inlets, so that the raw materials are intersected with airflow, the raw materials are scattered, and the crushing effect is achieved; the grading system is used for separating crushed materials, coarse particles return to the main crusher, and qualified particles are discharged and collected along with airflow. Magnetic impurities in materials can be removed, the electronic / pharmaceutical grade material standard is met, the shutdown risk and the whole-batch pollution are completely eradicated, and compared with a traditional system, the shutdown loss is reduced, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of material pulverization, and in particular to an airflow pulverization system with a demagnetization function. Background Art

[0002] In the fields of powder metallurgy, pharmaceuticals and high-purity materials, traditional airflow milling systems have the following defects: (1) Magnetic impurity contamination: Magnetic particles in the material (such as equipment wear debris) will reduce the purity of the finished product, especially causing fatal defects for electronic-grade materials (silicon micropowder, ceramic powder); (2) Demagnetization blind spot: The existing technology only sets up a simple magnetic separation at the front end of the feed, which cannot capture micron-level magnetic chips (<100μm), and lacks a secondary removal method for the iron chips remaining in the airflow after pulverization; (3) Insufficient intelligence: The demagnetization unit and the pulverization system operate independently. When the iron impurities suddenly increase, the feed cannot be stopped in real time, resulting in contamination of the entire batch of materials. Based on this, the present application proposes an airflow milling system with demagnetization function that can capture micron-level magnetic chips. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an airflow crushing system with a demagnetization function, which is specifically achieved through the following technical solutions:

[0004] An airflow pulverizing system with a demagnetization function, comprising:

[0005] A feeding system, comprising a vacuum loader, a buffer feeding bin, a pre-crushing device, a discharge valve and a feeding pipe, is used to convey the raw materials to the main crusher;

[0006] The magnetic separation device is integrated between the buffer feeding bin and the feeding pipe to remove ferromagnetic impurities in the material to prevent magnetic impurities from entering the crushing chamber and damaging the equipment;

[0007] The air intake system allows the compressed gas to be injected into the main crusher after being frozen, filtered and dried;

[0008] The main crusher is equipped with multiple air inlets to allow the raw materials to intersect with the airflow, breaking up the raw materials and achieving a crushing effect;

[0009] The grading system, including a classifier, a pulse dust collector, and a centrifugal fan, is used to separate the crushed materials. The coarse particles return to the main crusher, and the qualified particles are discharged and collected with the air flow.

[0010] Optionally or preferably, the magnetic separation device is rigidly connected between the outlet flange of the buffer charging bin and the inlet flange of the feed pipe; the magnetic field strength of the magnetic separation device can be adjusted in the range of 5000-15000 Gauss.

[0011] Optionally or preferably, the magnetic separation device also includes a Hall sensor and a current transmitter; the Hall sensor is used to monitor the density of magnetic impurities adsorbed by the magnetic separation device; the current transmitter is used to convert the magnetic field strength attenuation signal into a standard industrial signal; the magnetic separation device is linked to the discharge valve, and automatically suspends feeding when it detects that the iron impurities exceed the limit.

[0012] Optionally or preferably, a vibrating screen is further included for separating magnetic impurities from materials; an impurity collection bin is provided below the vibrating screen to support online cleaning.

[0013] Optionally or preferably, the vibrating screen is a three-layer screen; the apertures of the three-layer screen are designed with a gradient; the amplitude of the screen is 1.5-3 mm, and the inclination angle is 5-15°.

[0014] Optionally or preferably, it further includes a secondary magnetic separation unit; the secondary magnetic separation unit is arranged at the outlet of the centrifugal fan, and is used to capture micron-sized ferromagnetic particles remaining in the air flow; the secondary magnetic separation unit is a high-voltage electromagnetic fence.

[0015] Optionally or preferably, the buffer feeding bin is arranged at the bottom of the vacuum loader and is communicated with the vacuum loader; the feeding pipe is arranged at the bottom of the buffer feeding bin and is communicated with the buffer feeding bin; the discharge valve is arranged between the buffer feeding bin and the feeding pipe, for controlling the feeding speed;

[0016] The pre-crushing device is arranged between the vacuum loader and the buffer feeding bin and is located upstream of the magnetic separation device. The pre-crushing device is used to pre-treat materials that are easy to agglomerate or have poor fluidity to ensure that the materials enter the buffer feeding bin evenly and stably.

[0017] Optionally or preferably, the air intake system includes a gas compressor, a freeze dryer, an impurity filter, an air storage tank and an adsorption dryer; the compressed gas produced by the gas compressor enters the air storage tank after being processed by the freeze dryer and the impurity filter; the air outlet of the air storage tank is connected to the air inlet of the adsorption dryer; the air outlet of the adsorption dryer is connected to the air inlet of the main crusher.

[0018] Optionally or preferably, the compressed gas is an inert gas; and the air flow nozzle is a gradually converging and widening nozzle.

[0019] Optionally or preferably, the grading system includes a classifier, a pulse dust collector, and a centrifugal fan; the classifier is a vertical turbine classifier; the classifier includes a classifier barrel, a classifier head, a classifier cover, a classifier motor, and a discharge port; the classifier barrel is a conical barrel that is larger at the top and smaller at the bottom; the classifier head is arranged at the top of the classifier barrel; the classifier head is provided with a classifier motor and a discharge port; the bottom of the classifier barrel is a feed port.

[0020] Based on the above technical solution, the following technical effects can be produced:

[0021] The beneficial effects of the airflow pulverization system with demagnetization function provided by the present invention include:

[0022] (1) The combination of magnetic separation device and gradient vibrating screen can remove magnetic impurities and meet the standards of electronic / pharmaceutical grade materials;

[0023] (2) The magnetic separation device is linked to the feeding system and integrated with various sensor monitoring systems, which can eliminate the risk of downtime and contamination of the entire batch, reducing downtime losses and maintenance costs compared to traditional systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the main crusher of the present invention;

[0027] Figure 3 This is the logic diagram of demagnetization and unloading of the present invention.

[0028] In the figure: 1-gas compressor, 2-impurity filter, 3-freeze dryer, 4-gas storage tank, 5-adsorption dryer, 6-inlet pipe, 7-feeding fan, 8-vacuum feeder, 9-main crusher, 10-pre-crushing device, 11-bag dust collector, 12-buffer feeding bin, 13-discharge valve, 14-feed pipe, 15-magnetic separation device, 19-classifier, 20-pulse dust collector, 21-classifier barrel, 22-classifier head, 23-classifier cover, 24-classifier motor, 25-discharge port. DETAILED DESCRIPTION

[0029] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] Example 1:

[0032] like Figure 1-Figure 3 As shown:

[0033] This embodiment provides an airflow pulverization system with a demagnetization function, comprising:

[0034] The feeding system includes a vacuum loader 8, a buffer feeding bin 12, a pre-crushing device 10, a discharge valve 13 and a feeding pipe 14. The feeding system is used to transport the raw materials to the main crusher;

[0035] The magnetic separation device 15 is integrated between the buffer feeding bin 12 and the feeding pipe 14 to remove ferromagnetic impurities in the material to prevent the magnetic impurities from entering the crushing chamber and damaging the equipment;

[0036] The air intake system allows the compressed gas to be injected into the main crusher after being frozen, filtered and dried;

[0037] The main crusher 9 is provided with a plurality of air inlets, so that the raw material and the air flow intersect, breaking up the raw material and achieving a crushing effect;

[0038] The grading system includes a classifier 19, a pulse dust collector 20, and a centrifugal fan, which is used to separate the crushed materials. The coarse particles are returned to the main crusher, and the qualified particles are discharged and collected with the air flow.

[0039] In this embodiment, the magnetic separation device 15 is rigidly connected between the outlet flange of the buffer charging bin and the inlet flange of the feed pipe; the magnetic field strength of the magnetic separation device can be adjusted in the range of 5000-15000 Gauss.

[0040] In this embodiment, the magnetic separation device 15 also includes a Hall sensor and a current transmitter; the Hall sensor is used to monitor the density of magnetic impurities adsorbed by the magnetic separation device; the current transmitter is used to convert the magnetic field strength attenuation signal into a standard industrial signal; the magnetic separation device is linked to the discharge valve, and automatically suspends feeding when it detects that the iron impurities exceed the limit.

[0041] This embodiment also includes a vibrating screen for separating magnetic impurities from materials. An impurity collection bin is located below the vibrating screen to support online cleaning. Specifically, the impurity collection bin is a drawer-style bin with a built-in liquid level sensor that alarms when impurity accumulation exceeds a limit.

[0042] In this embodiment, the vibrating screen is a three-layer screen; the apertures of the three-layer screen are designed with a gradient; the amplitude of the screen is 1.5-3 mm, and the inclination angle is 5-15°.

[0043] In this embodiment, a secondary magnetic separation unit is also included; the secondary magnetic separation unit is arranged at the outlet of the centrifugal fan, and is used to capture micron-sized ferromagnetic particles remaining in the airflow; the secondary magnetic separation unit is a high-voltage electromagnetic fence.

[0044] In this embodiment, the buffer feeding bin 12 is provided at the bottom of the vacuum feeder 8 and is communicated with the vacuum feeder 8; the feeding pipe 14 is provided at the bottom of the buffer feeding bin 12 and is communicated with the buffer feeding bin 12; the discharge valve 13 is provided between the buffer feeding bin and the feeding pipe 14 and is used to control the feeding speed;

[0045] The pre-crushing device 10 is arranged between the vacuum loader and the buffer feeding bin, and is used to pre-treat materials that are easy to agglomerate or have poor fluidity, ensuring that the materials enter the buffer feeding bin evenly and stably.

[0046] In this embodiment, the pre-crushing device is a toothed roller crushing mechanism; the pre-crushing device is composed of a pair of staggered crushing toothed rollers, and the tooth profile of the crushing toothed rollers is wavy teeth; the crushing toothed rollers of the pre-crushing device are driven by a variable frequency motor.

[0047] In this embodiment, the air intake system includes a gas compressor 1, a freeze dryer 3, an impurity filter 2, a gas storage tank 4 and an adsorption dryer 5; the compressed gas produced by the gas compressor 1 is processed by the freeze dryer 3 and the impurity filter 2 and then enters the gas storage tank 4; the air outlet of the gas storage tank 4 is connected to the air inlet of the adsorption dryer 5; the air outlet of the adsorption dryer 5 is connected to the air inlet of the main crusher 9.

[0048] In this embodiment, the air intake system also includes an online dew point monitor and / or a compressed air flow meter; the online dew point monitor monitors the dew point of the treated compressed air in real time to ensure that it meets the crushing process requirements; the compressed air flow meter is used to monitor the intake flow in real time and communicate with the main control system.

[0049] In this embodiment, the main crusher 9 includes a crushing chamber and an air flow nozzle.

[0050] In this embodiment, the compressed gas is an inert gas, and the airflow nozzle is a gradually converging and widening nozzle. The supersonic jet accelerates the material in the pulverizing chamber and causes the materials to collide, impact, and rub against each other at the center of convergence, thereby crushing the particles. Specifically, the compressed gas is nitrogen. In this embodiment, the jet velocity of the airflow nozzle can reach Mach 2.5. Furthermore, the use of a gradually converging and widening nozzle structure can significantly increase the kinetic energy of particle collisions when achieving supersonic acceleration, reducing specific energy consumption.

[0051] In this embodiment, the grading system includes a classifier 19, a pulse dust collector 20, and a centrifugal fan 21; the classifier is a vertical turbine classifier; the classifier includes a classifier barrel 21, a classifier head 22, a classifier cover 23, a classifier motor 24, and a discharge port 25; the classifier barrel is a conical barrel with a larger top and a smaller bottom; the classifier head is arranged at the top of the classifier barrel; a classifier motor and a discharge port are provided on the classifier head; and the bottom of the classifier barrel is a feed port.

[0052] This embodiment has the following advantages:

[0053] (1) This application uses a magnetic separation device with adjustable magnetic field strength to accurately intercept magnetic impurities, avoid the reduction of equipment life due to wear in the crushing chamber, and extend the service life of core components; the primary magnetic separation + secondary magnetic separation covers the entire process, and the removal rate of residual magnetic particles exceeds 99%, ensuring the purity of the finished product;

[0054] (2) The Hall sensor monitors the impurity adsorption density in real time, and the unloading valve is linked to automatically suspend the feeding, reducing manual intervention and avoiding the risk of downtime caused by impurity accumulation; the liquid level sensor and current transmitter work together to achieve full monitoring of the equipment status;

[0055] (3) The three-layer gradient screen can effectively separate magnetic impurities and materials, reducing the loss of effective materials; the drawer-type impurity collection bin supports online cleaning, significantly improving the efficiency of continuous operation;

[0056] (4) The pre-crushing device pre-processes the agglomerated materials to ensure the uniformity of the feed and improve the crushing efficiency; the air flow nozzle with a gradually narrowing and widening nozzle design, combined with inert gas, improves the kinetic energy conversion efficiency and prevents the risk of explosion of flammable / oxidizable materials;

[0057] (5) The conical classifier barrel enhances the stability of the airflow and achieves precise classification of micron-sized particles; gas freezing, filtration, adsorption and drying processes ensure the cleanliness of the airflow, avoid equipment blockage, and reduce dust removal energy consumption.

[0058] The working principle of the present invention is:

[0059] 1. Feed demagnetization stage:

[0060] The material is sucked in by a vacuum feeder to ensure clean feeding. The pre-crushing device performs preliminary breaking up of materials that are prone to agglomeration or have poor fluidity, ensuring the continuity and uniformity of subsequent feeding and avoiding blockage. The material flows through the magnetic separation device to absorb ferromagnetic impurities; the intercepted impurities enter the vibrating screen with the material and are separated by tilting vibration into a drawer-type collection bin; the processed material falls into the buffer feeding bin for temporary storage. The Hall sensor monitors the impurity density. If it exceeds the limit, it outputs a signal through the current transmitter, which links the discharge valve to suspend feeding; the material flow rate is precisely controlled by the discharge valve, and the material is stably and quantitatively delivered to the crushing chamber of the main crusher through the feed pipe.

[0061] 2. Crushing stage:

[0062] After being compressed by a gas compressor, the inert gas passes through a freeze dryer to remove moisture, an impurity filter to remove particulate matter, a gas storage tank for pressure stabilization, and finally an adsorption dryer for deep drying, resulting in ultra-dry, high-purity, high-pressure compressed gas that meets pulverization requirements. The dry gas is accelerated into a supersonic flow through a gradually converging and widening nozzle, injected into the pulverizer's multiple air inlets, and pulverized by high-speed collision with the material.

[0063] 3. Classification and collection stage:

[0064] The crushed material and airflow mixture rises and enters the grading system. The motor drives the turbine to rotate at high speed, creating a powerful centrifugal field. Because the centrifugal force is greater than the drag force of the airflow, coarse particles are flung toward the inner wall of the classifier barrel and fall downward along the wall, returning to the main crusher through the bottom feed port for further crushing. Because the centrifugal force is less than the drag force of the airflow, fine powder is carried by the rising airflow through the grading turbine blades and enters the subsequent collection equipment through the top discharge port. Qualified material and airflow mixture enters the pulse dust collector, which collects the fine powder. The high-voltage electromagnetic fence at the fan outlet captures escaping micron-sized iron particles, ensuring the absolute cleanliness of the finished product. The clean air is extracted by the centrifugal fan and discharged or recycled.

[0065] The structures, functions, and connections disclosed herein may be implemented in other ways. For example, the embodiments described above are merely illustrative, and the pre-crushing device may be installed in other ways, such as multiple components being combined or integrated into another component. Furthermore, the functional components described in the various embodiments herein may be integrated into a single functional component, each functional component may exist physically separately, or two or more functional components may be integrated into a single functional component.

[0066] The foregoing description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Rather, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the concept described herein through the above teachings or techniques or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the appended claims.

Claims

1. An airflow pulverizing system with demagnetization function, characterized by: include: A feeding system, comprising a vacuum loader, a buffer feeding bin, a pre-crushing device, a discharge valve and a feeding pipe, is used to convey the raw materials to the main crusher; The magnetic separation device is integrated between the buffer feeding bin and the feeding pipe to remove ferromagnetic impurities in the material to prevent magnetic impurities from entering the crushing chamber and damaging the equipment; The air intake system allows the compressed gas to be injected into the main crusher after being frozen, filtered and dried; The main crusher is equipped with multiple air inlets to allow the raw materials to intersect with the airflow, breaking up the raw materials and achieving a crushing effect; The grading system, including a classifier, a pulse dust collector, and a centrifugal fan, is used to separate the crushed materials. The coarse particles return to the main crusher, and the qualified particles are discharged and collected with the air flow.

2. The airflow pulverizing system with demagnetization function according to claim 1, characterized in that: The magnetic separation device is rigidly connected between the outlet flange of the buffer charging bin and the inlet flange of the feed pipe; the magnetic field strength of the magnetic separation device can be adjusted in the range of 5000-15000 Gauss.

3. The airflow pulverizing system with demagnetization function according to claim 1, characterized in that: The magnetic separation device also includes a Hall sensor and a current transmitter; the Hall sensor is used to monitor the density of magnetic impurities adsorbed by the magnetic separation device; the current transmitter is used to convert the magnetic field strength attenuation signal into a standard industrial signal; the magnetic separation device is linked to the discharge valve and automatically suspends feeding when it detects that the iron impurities exceed the limit.

4. The airflow pulverizing system with demagnetization function according to claim 1, characterized in that: It also includes a vibrating screen for separating magnetic impurities from materials; an impurity collection bin is provided under the vibrating screen to support online cleaning.

5. The airflow pulverizing system with demagnetization function according to claim 4, characterized in that: The vibrating screen is a three-layer screen; the aperture of the three-layer screen is designed with a gradient; the amplitude of the screen is 1.5-3mm, and the inclination angle is 5-15°.

6. The airflow pulverizing system with demagnetization function according to claim 1, characterized in that: It also includes a secondary magnetic separation unit; the secondary magnetic separation unit is arranged at the outlet of the centrifugal fan and is used to capture micron-sized ferromagnetic particles remaining in the airflow; the secondary magnetic separation unit is a high-voltage electromagnetic fence.

7. The airflow pulverizing system with demagnetization function according to claim 1, characterized in that: The buffer feeding bin is arranged at the bottom of the vacuum feeding machine and is connected to the vacuum feeding machine; the feeding pipe is arranged at the bottom of the buffer feeding bin and is connected to the buffer feeding bin; the discharge valve is arranged between the buffer feeding bin and the feeding pipe to control the feeding speed; The pre-crushing device is arranged between the vacuum loader and the buffer feeding bin and is located upstream of the magnetic separation device. The pre-crushing device is used to pre-treat materials that are easy to agglomerate or have poor fluidity to ensure that the materials enter the buffer feeding bin evenly and stably.

8. The airflow pulverizing system with demagnetization function according to claim 1, characterized in that: The air intake system includes a gas compressor, a freeze dryer, an impurity filter, an air storage tank and an adsorption dryer; the compressed gas produced by the gas compressor is processed by the freeze dryer and the impurity filter and then enters the air storage tank; the air outlet of the air storage tank is connected to the air inlet of the adsorption dryer; and the air outlet of the adsorption dryer is connected to the air inlet of the main crusher.

9. The airflow pulverizing system with demagnetization function according to claim 1, characterized in that: The compressed gas is an inert gas; the air flow nozzle is a gradually converging and widening nozzle.

10. The airflow pulverizing system with demagnetization function according to claim 1, characterized in that: The classifier includes a classifier barrel, a classifier head, a classifier cover, a classifier motor, and a discharge port; the classifier barrel is a conical barrel that is larger at the top and smaller at the bottom; the classifier head is arranged on the top of the classifier barrel; the classifier head is provided with a classifier motor and a discharge port; the bottom of the classifier barrel is a feed port.

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