Composite jet mill for magnesium hydroxide

Abstract

The application relates to the technical field of crushing equipment, and discloses a composite airflow crusher for magnesium hydroxide, which comprises a crushing box, the upper surface of the crushing box is fixed with a box cover through threads, the inner side surface of the crushing box is adhered with a wear plate through heat-conducting glue, the upper surface of the box cover is through-welded with a discharging cylinder, the surface of the discharging cylinder is installed with a turbine through sealing bearings, the upper surface of the box cover and one side of the discharging cylinder are through-welded with a feeding air pipe, and the upper surface of the feeding air pipe is through-welded with a feeding bin. In the application, airflow acts on the turbine through the first annular air pipe and the first air nozzle, so that the turbine is driven to rotate, centrifugal force generated by high-speed rotation of the turbine is utilized to forcibly throw magnesium hydroxide materials to the wear plate, the materials are pre-crushed under the action of impact and friction, the processing load of the main crushing cavity is reduced, the overall energy consumption is indirectly reduced, and uniformly dispersed raw material basis is provided for subsequent superfine crushing.

Description

Technical Field

[0001] This utility model relates to the field of pulverizing equipment technology, and in particular to a composite airflow pulverizer for magnesium hydroxide. Background Technology

[0002] Magnesium hydroxide, as an important inorganic functional material, is widely used in flame retardants, environmental desulfurization, and pharmaceuticals. Its performance is closely related to particle size and dispersibility, typically requiring D50 ≤ 5 μm and a narrow particle size distribution (D90 / D50 ≤ 1.5). However, magnesium hydroxide has the following characteristics that make its ultrafine grinding process difficult: low hardness, high surface energy, heat sensitivity, and hygroscopicity.

[0003] The compound airflow pulverizer uses high-speed airflow to cause particles to collide and rub against each other to achieve pulverization. It has advantages such as no pollution and narrow particle size distribution, making it an ideal equipment for the preparation of ultrafine magnesium hydroxide. If the material is not fully dispersed before entering the pulverizing chamber, it is easy to form "agglomeration nuclei", resulting in low pulverization effect. Multiple cycles are required to reach the target particle size, and energy consumption is high. Utility Model Content

[0004] To solve the above problems, this utility model provides a composite airflow pulverizer for magnesium hydroxide.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a composite airflow pulverizer for magnesium hydroxide, comprising a pulverizing chamber, a chamber cover fixed to the upper surface of the pulverizing chamber by threads, and a wear-resistant plate adhered to the inner side of the pulverizing chamber by thermally conductive adhesive. A discharge cylinder is welded through the upper surface of the chamber cover, and a turbine is installed on the surface of the discharge cylinder by a sealed bearing. An inlet air duct is welded through the upper surface of the chamber cover and to one side of the discharge cylinder, and a feed bin is welded through the upper surface of the inlet air duct. A first annular air duct and a second annular air duct are provided on the outer side of the pulverizing chamber, and an air inlet pipe is connected through the first annular air duct and the second annular air duct. A first air nozzle and a second air nozzle are respectively installed in an inclined direction in an annular array on the inner side of the first annular air duct and the second air nozzle, both of which penetrate and extend into the interior of the pulverizing chamber.

[0006] By adopting the above technical solution, the airflow acts on the turbine through the first annular air duct and the first air nozzle, thereby driving the turbine to rotate. The centrifugal force generated by the high-speed rotation of the turbine forces the magnesium hydroxide material to be thrown towards the wear-resistant plate, so that the material can be efficiently pre-crushed under the action of impact and friction, reducing the processing load of the main crushing chamber and indirectly reducing the overall energy consumption, providing a uniformly dispersed raw material basis for subsequent ultrafine crushing.

[0007] Furthermore, a cooling chamber is provided inside the side wall of the crushing box, and an annular cooling pipe is installed inside the cooling chamber. A water inlet is installed through the outer side of the annular cooling pipe. The annular cooling pipe is bonded to the crushing box with thermally conductive adhesive, and fins are welded to the inner side of the annular cooling pipe.

[0008] By adopting the above technical solution, the cooling chamber on the side wall of the crushing box is combined with the annular cooling pipe. The heat generated by friction is carried away by the flowing medium, while the fins in the annular cooling pipe increase the heat exchange area, greatly improving the heat dissipation efficiency and stabilizing the temperature inside the crushing box below 40 degrees Celsius. This avoids the problem of surface moisture evaporation and electrostatic adsorption aggravated by high temperature of magnesium hydroxide, thus reducing the cause of agglomeration from the source.

[0009] Furthermore, the lower end of the side surface of the discharge cylinder is fully welded with a conical plate.

[0010] By adopting the above technical solution, when magnesium hydroxide is crushed and moves towards the discharge cylinder under the influence of airflow, the inclination angle of the conical plate forms a smooth guide slope. Because magnesium hydroxide particles are relatively light and easily carried by airflow, the conical plate guides these particles upwards along the slope into the discharge cylinder.

[0011] Furthermore, both the feed duct and the air inlet of the air inlet are equipped with filters.

[0012] By adopting the above technical solutions, the filter effectively intercepts external impurities, avoids contaminating the magnesium hydroxide material, ensures product purity, and meets the needs of high-end application scenarios.

[0013] Furthermore, the thermally conductive adhesive is made of graphene thermally conductive paste.

[0014] By adopting the above technical solution, graphene thermal conductive paste has an extremely high thermal conductivity, which can form an efficient heat conduction channel between the wear-resistant plate and the inner wall of the crushing chamber, and between the annular cooling pipe and the side wall of the crushing chamber. It can quickly transfer the frictional heat generated by the material impact from the wear-resistant plate to the crushing chamber, and then dissipate it through the cooling system, thus avoiding local heat accumulation.

[0015] Furthermore, the lower surface of the crushing box is fitted with support legs by anti-loosening bolts, and the lower surface of the support legs is fitted with anti-vibration pads.

[0016] By adopting the above technical solution, the support legs provide support for the crushing box, while the anti-vibration pads absorb vibration and reduce equipment operating noise.

[0017] In summary, this utility model has the following beneficial effects: 1. In this application, the airflow acts on the turbine through the first annular air duct and the first air nozzle, thereby driving the turbine to rotate. The centrifugal force generated by the high-speed rotation of the turbine forces the magnesium hydroxide material to be thrown towards the wear-resistant plate, so that the material can be efficiently pre-crushed under the action of impact and friction, reducing the processing load of the main crushing chamber and indirectly reducing the overall energy consumption, providing a uniformly dispersed raw material basis for subsequent ultrafine crushing. 2. In this application, the cooling chamber on the side wall of the crushing chamber is matched with the annular cooling pipe. The frictional heat is carried away by the flowing medium, and the fins in the annular cooling pipe increase the heat exchange area, greatly improving the heat dissipation efficiency and stabilizing the temperature in the crushing chamber below 40 degrees Celsius. This avoids the problem of surface moisture evaporation and electrostatic adsorption aggravated by high temperature of magnesium hydroxide, thus reducing the cause of agglomeration from the source. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the pulverizing box and its connection structure according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the pulverizing box and its connection structure according to an embodiment of the present invention.

[0019] In the diagram: 1. Crushing box; 2. Box cover; 3. Feed duct; 4. Feed bin; 5. First annular duct; 6. Second annular duct; 7. First air nozzle; 8. Second air nozzle; 9. Air inlet pipe; 10. Cooling chamber; 11. Wear-resistant plate; 12. Annular cooling pipe; 13. Fin; 14. Turbine; 15. Conical plate; 16. Discharge cylinder; 17. Support leg. Detailed Implementation

[0020] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0021] like Figure 1-3As shown in the embodiment of this application, a composite airflow pulverizer for magnesium hydroxide is disclosed, including a pulverizing box 1. A box cover 2 is fixed to the upper surface of the pulverizing box 1 by threads, and a wear-resistant plate 11 is adhered to the inner side of the pulverizing box 1 by thermally conductive adhesive. A discharge cylinder 16 is welded through the upper surface of the box cover 2, and a turbine 14 is installed on the surface of the discharge cylinder 16 by a sealed bearing. A feed air duct 3 is welded through the upper surface of the box cover 2 and on one side of the discharge cylinder 16, and a feed bin 4 is welded through the upper surface of the feed air duct 3. A first annular air duct 5 and a second annular air duct 6 are provided on the outer side of the pulverizing box 1, and an air inlet pipe 9 is connected through the first annular air duct 5 and the second annular air duct 6. A first air nozzle 7 and a second air nozzle 8 are respectively installed in an annular array inclined direction on the inner side of the first annular air duct 5 and the second annular air duct 6. The first air nozzle 7 and the second air nozzle 8 both penetrate and extend into the interior of the pulverizing box 1.

[0022] Crushing box 1: As the core load-bearing structure of the equipment, the upper surface is machined with annular threaded holes, which are detachably threaded to the box cover 2 by bolts; the inner surface is polished and then bonded with wear-resistant plate 11 by uniformly applied graphene thermal conductive paste; the outer surface is welded with annular brackets for fixing the first annular air duct 5 and the second annular air duct 6; the lower surface is machined with uniformly distributed bolt holes, which are connected to the support legs 17 by anti-loosening bolts, providing a closed crushing space to support all core working components (wear-resistant plate 11, nozzle, turbine 14, etc.); the cooling chamber 10 inside its side wall cooperates with the annular cooling pipe 12 to form a heat dissipation channel, transferring frictional heat to the cooling system through its own structure; as a connecting hub, it ensures the positional accuracy and working stability of each component.

[0023] Box cover 2: Adopts an annular flange structure matching the crushing box 1. The flange surface is machined with threaded holes corresponding to the crushing box 1, and is fixed by high-strength bolts. A high-temperature resistant sealing gasket is installed at the bolt connection. The discharge cylinder 16 is welded through the middle of the box cover 2, and the feed air duct 3 is welded through one side, forming a passage for materials and airflow, sealing the top of the crushing box 1, and forming a complete crushing chamber; it provides an installation foundation for the discharge cylinder 16, turbine 14, and feed air duct 3, ensuring the coaxiality and positional accuracy of these components; the sealing structure prevents leakage of high-pressure airflow and materials in the crushing chamber, ensuring that the airflow energy is concentrated on the crushing process.

[0024] Wear-resistant plate 11: It adopts an arc-shaped plate structure and is bonded to the inner side of the crushing chamber 1 by uniformly applying graphene thermal conductive paste. Before bonding, the contact surface needs to be sandblasted. The edges are flush with the inner wall of the crushing chamber 1 without protrusions. It directly bears the impact and friction of magnesium hydroxide material thrown out by turbine 14. It resists wear through high-hardness material (such as zirconia ceramic) and extends the service life of the equipment. As a heat transfer medium, it quickly transfers the frictional heat generated by the material impact to the side wall of the crushing chamber 1 through graphene thermal conductive paste, and works with the cooling system to dissipate heat. Its smooth inner surface reduces material adhesion and avoids agglomeration.

[0025] Discharge cylinder 16 and turbine 14: The discharge cylinder 16 is a hollow cylindrical structure, with its middle end fully welded to the cover 2 and its upper end extending to the outside of the equipment; the turbine 14 is installed on the outer side of the lower end of the discharge cylinder 16 through a sealed bearing. The blades of the turbine 14 are evenly distributed along the circumference, and the tips of the blades maintain a certain gap with the inner surface of the wear-resistant plate 11. The discharge cylinder 16 is the discharge channel for the crushed material, and its hollow structure ensures that the airflow carries the material out smoothly; the turbine 14 rotates at high speed under the airflow drive of the first air nozzle 7, generating centrifugal force to force the magnesium hydroxide material entering from the feed air pipe 3 to the wear-resistant plate 11, thereby achieving pre-crushing; the sealed bearing ensures the stability of the turbine 14 during rotation and the sealing of the crushing chamber, preventing airflow leakage from the bearing gap.

[0026] Feed duct 3 and feed bin 4: Feed duct 3 is an inclined tubular structure, with its lower end welded through to the cover 2 and its upper end welded through to the bottom of feed bin 4; Feed bin 4 is a funnel-shaped structure with an openable cover plate on top. The air inlet of feed duct 3 is fixed with a filter screen by bolts. Feed bin 4 temporarily stores magnesium hydroxide material to be crushed, and the funnel structure enables the material to fall evenly; Feed duct 3 guides the material into the crushing chamber and also serves as an airflow channel; The filter screen intercepts impurities in the air source to prevent contamination of the material or wear on the turbine 14 and the nozzle, ensuring product purity.

[0027] The first annular duct 5, the second annular duct 6, the first nozzle 7, and the second nozzle 8: The first annular duct 5 and the second annular duct 6 are concentric ring structures, welded to the outer side of the crushing box 1 by a bracket; both are welded to the air inlet duct 9 through evenly distributed branch pipes; the first nozzle 7 and the second nozzle 8 are installed obliquely in a ring array along the inner side of the annular duct, with the ends of the nozzles penetrating the side wall of the crushing box 1 and extending into the interior, and the annular duct evenly distributes the high-pressure airflow to each nozzle; the first nozzle 7 drives the turbine 14 to rotate to achieve pre-crushing, and the second nozzle 8 forms a counter-current airflow field, so that the pre-crushed material is further ultra-finely crushed under the impact of the airflow. The two work together to reduce the crushing load of a single step and improve efficiency; the tilt angle design of the nozzles ensures that the airflow energy is concentrated on the material, avoiding ineffective energy consumption.

[0028] A cooling chamber 10 is provided inside the side wall of the crushing box 1, and an annular cooling pipe 12 is installed inside the cooling chamber 10. A water inlet is installed through the outer side of the annular cooling pipe 12. The annular cooling pipe 12 is bonded to the crushing box 1 by thermally conductive adhesive, and fins 13 are welded to the inner side of the annular cooling pipe 12.

[0029] Cooling chamber 10, annular cooling pipe 12, and fins 13: Cooling chamber 10 is an annular cavity machined inside the side wall of the crushing chamber 1; the annular cooling pipe 12 is distributed in a ring inside the cooling chamber 10 and is bonded to the inner wall of the cooling chamber 10 by graphene thermal conductive paste; the outer side of the cooling pipe is welded with a water inlet, and multiple sets of fins 13 are welded to the inner side. The cooling chamber 10 provides installation space for the annular cooling pipe 12 and also serves as a heat buffer area; 5-10℃ coolant flows inside the annular cooling pipe 12, absorbing the heat transferred from the crushing chamber 1 through the thermal conductive paste; the fins 13 increase the contact area between the cooling pipe and the air inside the cooling chamber 10, improving heat exchange efficiency.

[0030] The lower end of the side surface of the discharge cylinder 16 is fully welded with a conical plate 15.

[0031] Conical plate 15: It is an inverted conical metal plate with the small end facing up and the large end facing down. It is fixed to the lower end of the side surface of the discharge cylinder 16 by full welding. The cone apex and the inner wall of the discharge cylinder 16 maintain a smooth transition. The qualified fine particles after crushing are guided upward along the cone surface into the discharge cylinder 16 by the inclined cone surface.

[0032] Both the feed duct 3 and the air inlet duct 9 are equipped with filters.

[0033] Filter screen: The filter screen intercepts impurities (such as dust and metal particles) in the air source, preventing contaminants from contaminating the material or causing wear on the turbine 14 and nozzle, thus ensuring product purity.

[0034] The thermal conductive adhesive is made of graphene thermal conductive paste.

[0035] Thermally conductive adhesive: As an intermediary material, it is applied between the wear-resistant plate 11 and the inner wall of the crushing chamber 1, and between the annular cooling pipe 12 and the inner wall of the cooling cavity 10. The adhesive formed after curing achieves a tight fit between the components. It utilizes the high thermal conductivity to build an efficient heat transfer channel, which quickly transfers the frictional heat of the wear-resistant plate 11 and the heat of the crushing chamber 1 to the cooling system; it fills the tiny gaps on the contact surfaces of the components and improves the heat transfer efficiency.

[0036] The lower surface of the crushing box 1 is fitted with support legs 17 by anti-loosening bolts, and the lower surface of the support legs 17 is fitted with anti-vibration pads.

[0037] Support Leg 17: Support Leg 17 is a columnar structure, with its upper end connected to the bolt holes on the lower surface of the crushing box 1 via anti-loosening bolts; the anti-vibration pad is fixed to the lower end face of Support Leg 17 by adhesive or bolts, in contact with the ground. Support Leg 17 supports the entire equipment, ensuring that the crushing box 1 maintains a certain height from the ground; the anti-loosening bolts resist loosening caused by equipment vibration through a locking structure, ensuring the overall structural stability; the anti-vibration pad absorbs high-frequency vibrations during equipment operation, reducing noise and preventing vibration from being transmitted to the ground and affecting other equipment.

[0038] The operating principle of the composite airflow pulverizer for magnesium hydroxide in this embodiment is as follows: When the equipment is running, the high-pressure airflow is split into the first and second annular air ducts 6 through the air inlet pipe 9: 1. The airflow from the first air nozzle 7 drives the turbine 14 to rotate at high speed. At the same time, the magnesium hydroxide material enters the pulverizing chamber from the feed bin 4 through the feed air duct 3 and is thrown towards the wear-resistant plate 11 by the centrifugal force of the turbine 14. It is pre-pulverized by impact and friction; 2. The opposing airflow from the second air nozzle 8 forms a strong airflow field in the middle of the pulverizing chamber, which further collides and shears the pre-pulverized material to achieve ultra-fine pulverization; 3. The heat generated during the pulverization process is quickly dissipated through the path of wear-resistant plate 11 → graphene thermal conductive paste → side wall of pulverizing box 1 → annular cooling pipe 12 (including fins 13). The cooling system controls the temperature below 40°C to prevent material agglomeration; 4. Qualified fine particles are guided by the airflow through the conical plate 15 and discharged into the discharge cylinder 16; 5. The filter screen intercepts impurities to ensure purity, and the support legs 17 and the anti-vibration pads ensure long-term reliable operation of the equipment through stable support and shock absorption.

[0039] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A compound airflow pulverizer for magnesium hydroxide, comprising a pulverizing chamber (1), characterized in that: The upper surface of the crushing box (1) is fixed with a box cover (2) by threads, and the inner side of the crushing box (1) is adhered with a wear-resistant plate (11) by thermally conductive adhesive. The upper surface of the box cover (2) is welded through a discharge cylinder (16), and the surface of the discharge cylinder (16) is equipped with a turbine (14) by a sealed bearing. The upper surface of the box cover (2) and one side of the discharge cylinder (16) is welded through a feed air pipe (3), and the upper surface of the feed air pipe (3) is welded through a feed bin (4). The outer side of the crushing box (1) is provided with a first annular air pipe (5) and a second annular air pipe (6), and an air inlet pipe (9) is connected through between the first annular air pipe (5) and the second annular air pipe (6). The inner sides of the first annular air pipe (5) and the second annular air pipe (6) are respectively installed with a first air nozzle (7) and a second air nozzle (8) in an annular array inclined direction. The first air nozzle (7) and the second air nozzle (8) are both through and extend into the interior of the crushing box (1).

2. The composite airflow pulverizer for magnesium hydroxide according to claim 1, characterized in that: The side wall of the crushing box (1) is provided with a cooling chamber (10), and an annular cooling pipe (12) is installed inside the cooling chamber (10). A water inlet is installed through the outer side of the annular cooling pipe (12). The annular cooling pipe (12) is bonded to the crushing box (1) by thermally conductive adhesive. Fins (13) are welded to the inner side of the annular cooling pipe (12).

3. The composite airflow pulverizer for magnesium hydroxide according to claim 2, characterized in that: The lower end of the side surface of the discharge cylinder (16) is fully welded with a conical plate (15).

4. The composite airflow pulverizer for magnesium hydroxide according to claim 3, characterized in that: The air inlets of the feed duct (3) and the air inlet duct (9) are both equipped with filters.

5. The composite airflow pulverizer for magnesium hydroxide according to claim 4, characterized in that: The thermally conductive adhesive is made of graphene thermally conductive paste.

6. The composite airflow pulverizer for magnesium hydroxide according to claim 5, characterized in that: The lower surface of the crushing box (1) is fitted with a support leg (17) by anti-loosening bolts, and the lower surface of the support leg (17) is fitted with a shock-absorbing pad.

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