Micro powder grinding equipment
By designing a motor-driven micropowder grinding device and using rotating airflow for grinding and grading, the complexity and high cost problems of existing airflow grinding devices are solved, and the micropowder grinding effect with higher grading accuracy and low energy consumption is achieved.
Patent Information
- Application Number
- CN202420824493.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-19
- Publication Date
- 2024-12-10
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing airflow grinding devices have complex processes, large space, high manufacturing costs, large air volume and large wind pressure fluctuations, resulting in unstable particle size of finished powder, difficult material collection, and require an additional screening and grading system.
A micro powder grinding equipment was designed, using a motor to drive the spindle to drive the wind wheel and the grading wheel to rotate, and a rotating air flow is generated by tangential guide air holes for grinding and grading. Combined with the feed port, silo, feeding spiral and dust collection assembly, simplifying the The structure reduces the use of air compressors, integrates the functions of airflow grinding and classifiers, reduces air volume and air pressure, and improves grading accuracy.
It realizes a smaller equipment volume, low manufacturing cost, and low energy consumption, simplifies the structure, improves the grading accuracy of materials, facilitates later collection, reduces wind pressure fluctuations and heat loss, and reduces the requirements for air humidity.
Smart Images
Figure CN222132131U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of powder grinding equipment, in particular to a micro powder grinding equipment. Background Art
[0002] Ultrafine particles are widely used in materials science, biomedicine, chemical engineering and other fields. Airflow grinding is a highly efficient powder processing method that can be used to prepare ultrafine particles. Applicable materials include but are not limited to diamond, silicon carbide, metal powder, ceramic pigments, etc.
[0003] Chinese patent document CN218516894U discloses a transparent material airflow grinding device, including a feed hopper, an airflow grinding chamber connected to one side of the feed hopper, a pulse dust collector connected to one side of the airflow grinding chamber, and an induced draft fan connected to one side of the pulse dust collector; a feed pipe is connected to the bottom of the feed hopper, a venturi feeding pipe is connected to the other side of the feed pipe, and the venturi feeding pipe is also connected to a first pressure regulating valve; the airflow grinding chamber is connected to a second pressure regulating valve, the bottom of the airflow grinding chamber is connected to a first collecting tank, and the bottom of the pulse dust collector is connected to a second collecting tank. The first pressure regulating valve and the second pressure regulating valve are both externally connected to an air compressor (or a high-pressure air source). The defects and shortcomings of the airflow grinding device are as follows: (1) The airflow grinding device has a complex process, numerous system components, and occupies a large space. The overall manufacturing cost and operating cost of the device are also high. (2) The airflow grinding device uses a large amount of air and the wind pressure fluctuates greatly, which easily causes the finished powder to have unstable particle size and unsatisfactory crystal form, making it difficult to collect materials in the later stage, and requiring a larger dust collection device. (3) After the jet mill is ground, the material screening needs to be connected to a screening and grading system.
[0004] Therefore, there is an urgent need to provide a micro-powder grinding device that occupies little space and has low manufacturing cost. Utility Model Content
[0005] 1. Technical issues to be resolved
[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a micro powder grinding equipment, which solves the technical problems that the existing air flow grinding and screening and grading system occupies a large space, has a complicated process and is expensive overall, while improving the grading accuracy of material screening.
[0007] (II) Technical solution
[0008] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:
[0009] The embodiment of the utility model provides a micro powder grinding device, including a motor, a main shaft, an upper cover with a feed port, an outer cavity with an air inlet channel at the lower part, a grinding cavity with a plurality of tangential air guide holes on the side wall, a wind wheel, a grading wheel and a hollow discharge shaft;
[0010] The grinding chamber is located in the upper part of the outer chamber, the classifying wheel is located in the grinding chamber, the upper cover is provided on the grinding chamber and the upper part of the outer chamber, and the wind wheel is located in the inner lower part of the outer chamber; the output end of the motor is connected to one end of the main shaft, and the other end of the main shaft passes through the bottom wall of the outer chamber and the bottom wall of the grinding chamber in sequence, and is fixedly connected to the wind wheel and the classifying wheel respectively, the upper part of the classifying wheel is connected to one end of the discharging hollow shaft, and the other end of the discharging hollow shaft passes through the upper cover.
[0011] Optionally, a material bin is provided at the feed inlet of the upper cover, and a feeding screw is provided on the outer side surface of the discharge hollow shaft close to the grading wheel.
[0012] Optionally, the silo is externally connected with a powder quantitative feeding device.
[0013] Optionally, a dustpan-shaped wind gathering groove is provided at the end of the blade of the grading wheel.
[0014] Optionally, the wind wheel is an aeration impeller.
[0015] Optionally, a dust collecting assembly is further included, and the dust collecting assembly is connected to the discharge channel inside the discharge hollow shaft.
[0016] Optionally, the air inlet passage is provided with an air inlet flow regulating valve and an air purification device.
[0017] Optionally, the micro powder grinding equipment is vertical, horizontal or inclined.
[0018] (III) Beneficial effects
[0019] The beneficial effects of the utility model are as follows: the micro powder grinding equipment of the utility model adopts a motor to drive the main shaft to rotate, and the rotation of the main shaft drives the wind wheel and the classifying wheel to rotate. Since the matching parameters or sizes of the wind wheel and the classifying wheel are different, the wind pressure generated by the wind wheel is higher than the wind pressure generated by the classifying wheel. Under the action of the pressure difference, the gas enters the grinding cavity through the tangential air guide hole from the outer cavity, and flows circumferentially inside the grinding cavity, and is consistent with the rotation direction of the classifying wheel. Under the joint action of the tangential airflow and the rotation of the classifying wheel, a rotating airflow is generated in the grinding cavity; after the material to be ground enters the grinding cavity through the feed port, it moves with the rotating airflow , colliding and grinding each other; finally, the qualified materials overcome the centrifugal force under the action of the radial force of the airflow, enter the inside of the classifying wheel to be screened out, and are discharged from the inside of the hollow shaft of the discharge. Compared with the prior art, the micro-powder grinding equipment of the utility model does not need to be equipped with an air compressor (or a high-pressure air source), and combines the functions of an air flow mill and a classifier. The instantaneous air volume is greatly reduced, and the wind pressure is stable, which is beneficial to the stability of the laminar flow between the blades of the classifying wheel, improves the classification accuracy, and is convenient for the later micro-powder collection. At the same time, the structure is simplified, the volume of the whole machine is reduced, the space occupied is smaller, the manufacturing cost is low, and the energy consumption is low. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a three-dimensional schematic diagram of embodiment 1 of the micro powder grinding equipment of the utility model;
[0021] Figure 2 It is a cross-sectional schematic diagram of embodiment 1 of the micro-powder grinding equipment of the utility model;
[0022] Figure 3 This is a schematic diagram of the connection between the classifying wheel and the discharging hollow shaft in Example 1;
[0023] Figure 4 Schematic diagram of the structure of the grinding chamber in Example 1;
[0024] Figure 5 for Figure 4 A horizontal cross-sectional schematic diagram of a grinding chamber in FIG.
[0025] Figure 6 It is a three-dimensional schematic diagram of Embodiment 2 of the discharge hollow shaft of the micro-powder grinding equipment of the utility model;
[0026] Figure 7 It is a structural schematic diagram of the classifying wheel blade embodiment 3 of the micro powder grinding equipment of the utility model.
[0027] [Description of Reference Numerals]
[0028] 1: main shaft; 2: feed port; 3: upper cover; 4: air inlet channel; 5: outer cavity; 6: tangential air guide hole; 7: grinding cavity; 8: wind wheel; 9: classifying wheel; 91: first connecting plate; 92: second connecting plate; 93: classifying wheel blades; 94: air gathering groove; 10: discharge hollow shaft; 11: silo; 12: feeding screw. DETAILED DESCRIPTION
[0029] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below in conjunction with the accompanying drawings through specific implementation methods. Figure 1 The orientation is used as a reference.
[0030] Embodiment 1:
[0031] Reference Figure 1 and Figure 2 The present embodiment provides a micro powder grinding device, including a motor, a main shaft 1, an upper cover 3 with a feed port 2, an outer cavity 5 with an air inlet channel 4 at the lower part, a grinding cavity 7 with multiple tangential air guide holes 6 on the side wall, a wind wheel 8, a grading wheel 9 and a discharge hollow shaft 10.
[0032] Among them, the grinding chamber 7 is located in the upper part of the outer chamber 5, the classifying wheel 9 is located in the grinding chamber 7, the upper cover 3 is set on the upper part of the grinding chamber 7 and the outer chamber 5, and the wind wheel 8 is located in the lower part of the outer chamber 5. The output end of the motor is connected to one end of the main shaft 1, and the other end of the main shaft 1 passes through the bottom wall of the outer chamber 5 and the bottom wall of the grinding chamber 7 in sequence, and is fixedly connected to the wind wheel 8 and the classifying wheel 9 respectively. The upper part of the classifying wheel 9 is connected to one end of the discharge hollow shaft 10, and the other end of the discharge hollow shaft 10 passes through the upper cover 3.
[0033] The working process of the micro powder grinding equipment of this embodiment is as follows: First, the motor drives the main shaft 1 to rotate, and the rotation of the main shaft 1 drives the wind wheel 8 and the classifying wheel 9 to rotate. Due to the different matching parameters or sizes of the wind wheel 8 and the classifying wheel 9, the wind pressure generated by the wind wheel 8 is higher than the wind pressure generated by the classifying wheel 9. Under the action of the pressure difference, the gas enters the grinding cavity 7 from the outer cavity 5 through the tangential air guide hole, and flows circumferentially inside the grinding cavity 7, and is consistent with the rotation direction of the classifying wheel 9. Under the joint action of the tangential airflow and the rotation of the classifying wheel 9, a rotating airflow is generated in the grinding cavity 7. Secondly, the material to be ground enters the upper part of the second connecting plate 92 of the classifying wheel 9 through the feed port 2, and is thrown into the interior of the grinding cavity 7 by the blades extending above the second connecting plate 92, and rotates with the rotating airflow, and friction and collision occur between the materials to achieve material grinding. Finally, since the wind pressure generated by the wind wheel 8 is higher than the wind pressure generated by the classifying wheel 9, part of the airflow in the rotating airflow in the grinding chamber 7 will flow to the center of the classifying wheel 9 with the pressure difference. When the material passes through the classifying blades, it is simultaneously subjected to the centrifugal force generated by the rotation of the classifying wheel 9 and the radial force moving toward the center of the classifying wheel 9 with the airflow. The material that meets the particle size requirement overcomes the centrifugal force and enters the center of the classifying wheel 9 with the airflow, and is discharged through the hollow discharge shaft 10 to enter the next collection process. For powder particles that do not meet the particle size requirement or are relatively large, the radial force moving with the airflow cannot overcome the centrifugal force generated by the rotation of the classifying wheel 9, and is thrown back into the periphery by the classifying wheel 9 for grinding again.
[0034] The micro-powder grinding device of this embodiment also includes a dust collecting component connected to the discharge channel inside the discharge hollow shaft 10. Based on the smaller air volume, the discharge air volume of the micro-powder grinding device of this embodiment is also smaller, which is convenient for collecting materials, and the volume occupied by the dust collecting component can also be significantly reduced.
[0035] In addition, the micro-powder grinding equipment of this embodiment can avoid the problem of rapid dissipation of heat generated during material grinding due to excessively high air volume and wind speed in the prior art because of its relatively low air volume and wind speed. Therefore, the micro-powder grinding equipment of this embodiment can utilize the heating effect during the material grinding process to reduce the combination of water vapor in the air and the material, so that the grinding equipment has lower requirements for air humidity.
[0036] Combination Figure 3 As shown, the classifying wheel 9 specifically includes a first connecting plate 91, a second connecting plate 92 and a plurality of classifying wheel blades 93. The plurality of classifying wheel blades 93 are evenly arranged around the central axis, the first connecting plate 91 is connected to the main shaft 1, and the second connecting plate 92 is connected to the discharge hollow shaft 10.
[0037] Reference Figure 4 and Figure 5In this embodiment, the number of tangential air guide holes 6 on the grinding chamber 7 is 3 (including 3) or more, and the multiple air guide holes 6 are evenly distributed on the side wall of the grinding chamber 7. The number of tangential air guide holes 6 is determined according to the actual matching parameters of the wind wheel and the classifying wheel, as well as the actual diameter of the grinding chamber 7 and the size of the air guide holes. In addition, it should be further explained that the tangential air guide holes 6 can be in the shape of a Laval nozzle, and the angle β between its direction and the radial direction of the grinding chamber 7 is 60°-89°. In other words, the direction of the tangential air guide holes 6 is close to the tangential direction of the grinding chamber 7, so that after the airflow enters the grinding chamber 7, an air barrier is formed near the inner wall of the grinding chamber 7, and the air barrier can prevent the material from colliding with the inner wall of the grinding chamber 7, which prolongs the service life of the grinding chamber 7.
[0038] Furthermore, the micro powder grinding equipment of this embodiment can be placed vertically, horizontally or tilted.
[0039] Furthermore, a silo 11 is provided at the feed port 2 of the upper cover 3 , and a powder quantitative feeding device is externally connected to the silo 11 .
[0040] In this embodiment, an air intake flow regulating valve and an air purification device are provided on the air intake channel 4. Controlling the air intake flow regulating valve can control the gas flow and wind speed entering the grinding chamber 7, so that the internal and external pressure difference is constant when the classifying wheel 9 is working, the laminar flow effect is better, and the classification accuracy is higher. The air purification device can be used to purify and filter the air entering the outer cavity 5 to prevent impurities from entering the grinding chamber 7 and affecting the grinding effect of the material.
[0041] In this embodiment, the wind wheel 8 is preferably an aeration impeller.
[0042] The micro-powder grinding equipment of this embodiment can achieve different grinding particle size requirements of materials by adjusting the opening degree of the air intake flow regulating valve, changing the rotation speed of the motor and the main shaft 1, and replacing the classifying wheel 9 with different parameters and different wind wheels 8 during use. In addition, the material of the classifying wheel 9 and the grinding chamber 7 can also be selected according to the hardness of the material to be ground.
[0043] Embodiment 2:
[0044] See also Figure 6 This embodiment provides another micro powder grinding equipment. The difference from the first embodiment is that a feeding screw 12 is arranged on the outer surface of the hollow discharge shaft 10 close to the grading wheel 9 in this embodiment to avoid the material sticking to the wall and arching during the feeding process, which causes the material to be discharged unsmoothly.
[0045] The rest of the same points as in Example 1 will not be repeated here.
[0046] Embodiment 3:
[0047] Reference Figure 7 This embodiment provides another micro powder grinding device. Compared with the embodiment 1, the end of the classifying wheel blade 93 of this embodiment is provided with a dustpan-shaped wind gathering groove 94. The purpose of providing the wind gathering groove 94 is to form an alternating wind pressure in the internal grinding area of the grinding chamber 7, which is conducive to further improving the grinding effect.
[0048] The rest of the same points as in Example 1 will not be repeated here.
[0049] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0050] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0051] In the present utility model, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.
[0052] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.
[0053] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.
Claims
1. A micro powder grinding device, characterized in that: It comprises a motor, a main shaft (1), an upper cover (3) with a feed port (2), an outer cavity (5) with an air inlet channel (4) at the bottom, a grinding cavity (7) with a plurality of tangential air guide holes (6) on the side wall, a wind wheel (8), a classifying wheel (9) and a discharge hollow shaft (10); The grinding chamber (7) is located in the upper inner part of the outer chamber (5), the classifying wheel (9) is located in the grinding chamber (7), the upper cover (3) is arranged on the upper inner part of the grinding chamber (7) and the outer chamber (5), and the wind wheel (8) is located in the lower inner part of the outer chamber (5); the output end of the motor is connected to one end of the main shaft (1), and the other end of the main shaft (1) passes through the bottom wall of the outer chamber (5) and the bottom wall of the grinding chamber (7) in sequence, and is fixedly connected to the wind wheel (8) and the classifying wheel (9) respectively; the upper part of the classifying wheel (9) is connected to one end of the discharge hollow shaft (10), and the other end of the discharge hollow shaft (10) passes through the upper cover (3).
2. The micro powder grinding equipment according to claim 1, characterized in that: A material bin (11) is provided at the feed inlet (2) of the upper cover (3), and a feeding screw (12) is provided on the outer side of the discharge hollow shaft (10) close to the grading wheel (9).
3. The micro powder grinding equipment according to claim 2, characterized in that: The material bin (11) is externally connected with a powder quantitative feeding device.
4. The micro powder grinding equipment according to claim 1, characterized in that: The blade ends of the classifying wheel (9) are provided with wind gathering grooves (94) in the shape of a dustpan.
5. The micro powder grinding equipment according to claim 1, characterized in that: The wind wheel (8) is an aeration impeller.
6. The micro powder grinding equipment according to claim 1, characterized in that: It also comprises a dust collecting component, which is in communication with a discharge channel inside the discharge hollow shaft (10).
7. The micro powder grinding equipment according to any one of claims 1 to 6, characterized in that: The air inlet passage (4) is provided with an air inlet flow regulating valve and an air purification device.
8. The micro powder grinding equipment according to any one of claims 1 to 6, characterized in that: The micro powder grinding equipment is vertical, horizontal or tilted.