Jet mill

Abstract

The utility model provides a jet mill which is used for solving the problem of low milling efficiency. A jet mill comprises a grinding cavity, the grinding cavity is communicated with a feeding device, a crushing air inlet and a discharging device, a plurality of guide teeth are fixed to the bottom face in the grinding cavity, the section of each guide tooth is triangular, a one-way discharging device is arranged at the bottom end of the grinding cavity, and the one-way discharging device is communicated with a discharging bin through a discharging opening. And the discharge bin is connected with the feeding device through a return pipe. Due to the arrangement of the guide teeth, kinetic energy can be effectively converted into internal energy when materials are impacted, and crushing of the materials is promoted. And the guide teeth can enable the materials to be fully dispersed in the grinding cavity and can be impacted by newly entering materials, so that the crushing efficiency is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of airflow pulverizers, and specifically point to a kind of airflow pulverizer. BACKGROUND

[0002] In modern industrial production, airflow pulverizer is a common pulverizing equipment, widely used in chemical, pharmaceutical, food and other industries, the traditional airflow pulverizer in the working process, material is mainly pulverized by the impact force generated by high-speed airflow, however, kinetic energy loss is larger in the process of impact, and it is easy to form accumulation in grinding cavity, leading to low pulverizing efficiency, and part of material is difficult to achieve ideal pulverizing degree.In addition, due to uneven distribution of material in the grinding cavity, part of material may not be subjected to the impact of newly entering material, further affecting the stability of pulverizing effect and product quality. SUMMARY

[0003] The utility model provides a kind of airflow pulverizer, solve the problem of low pulverizing efficiency in prior art.

[0004] The technical scheme of the utility model is realized as follows:

[0005] A kind of airflow pulverizer, including grinding cavity, grinding cavity is communicated with feeding device, pulverizing air inlet and discharging device, the bottom surface in grinding cavity is fixed with multiple guide teeth, the cross section of guide tooth is triangle, the bottom end of grinding cavity is equipped with one-way discharge device, one-way discharge device is communicated with discharge bin by discharge port, discharge bin is connected with feeding device by return pipe.

[0006] Further, the grinding cavity is provided with a grinding disc, the guide teeth are all fixed on the grinding disc, the bottom end outside the grinding cavity is fixed with a driving motor, the output shaft of the driving motor drives the grinding disc, and the rotating direction of the grinding disc is opposite to the rotating direction of the airflow introduced by the pulverizing air inlet.The rotation of the grinding disc and the driving effect of the airflow combine to make the material in the grinding cavity receive more uniform and more comprehensive pulverizing effect.

[0007] Further, the top angle of the guide tooth is 30-60 degrees.Suitable top angle degree makes the material more easily slide or throw after impacting the guide tooth along the inclined plane, instead of accumulating between the guide teeth, which also improves the operation efficiency and stability of the equipment.

[0008] Further, the grinding disc includes a center plate, and a plurality of grinding rings with gradually increasing diameters are sequentially arranged around the center plate.The guide teeth are evenly distributed on the grinding rings along the axis of the center plate.The staggered guide teeth and the increased contact area work together to make the material in the grinding cavity receive more uniform and more comprehensive pulverizing.

[0009] Further, the one-way discharging device comprises a ring-shaped plate, the inner side of the ring-shaped plate is provided with a plurality of sliding blocks, the outer side of the grinding disc is provided with T-shaped sliding grooves corresponding to the sliding blocks, the sliding blocks slide along the T-shaped sliding grooves, the ring-shaped plate slides along the axis direction of the grinding disc through the T-shaped sliding grooves and the sliding blocks, the bottom surface of the ring-shaped plate is connected with the grinding cavity through a plurality of spring telescopic rods, the ring-shaped plate can close the discharge port in cooperation with the grinding disc, the discharge port connects the discharging bin and the grinding cavity in communication, and when the spring telescopic rods are compressed, the ring-shaped plate moves downward along the T-shaped sliding grooves and opens the discharge port. Through the downward movement of the ring-shaped plate and the spring telescopic rods along the T-shaped sliding grooves and the opening of the discharge port, automatic discharging is realized, manual intervention is reduced, labor intensity is reduced, and production efficiency is improved.

[0010] Further, the discharging device comprises a cyclone separator, the upper end of the cyclone separator is provided with a gas outlet, the inner side wall of the cyclone separator is fixedly provided with an upper fixed ring and a lower fixed ring, a filter cloth bag is fixed between the upper fixed ring and the lower fixed ring, the filter cloth bag can cover the gas outlet, the bottom surface of the upper fixed ring is fixedly provided with a vibration motor, the vibration motor drives a rocker, and the rocker can abut against the outer side wall of the filter cloth bag. By arranging the filter cloth bag, fine materials are prevented from being discharged out of the equipment, and material waste is reduced. The vibration motor drives the rocker to make the fine materials remaining in the filter cloth bag separate from the cloth bag and be collected, labor intensity and time for manual cleaning are reduced, and maintenance efficiency of the equipment is improved.

[0011] The technical scheme has the beneficial effects that: the guiding teeth can effectively convert kinetic energy into internal energy when the material collides, and promote the crushing of the material. The guiding teeth can also make the material fully dispersed in the grinding cavity, and the material can be impacted by newly entering material, thereby further improving the crushing efficiency. The one-way discharging device and the return pipe form a circulating crushing mechanism, which ensures that all the material can reach the required crushing degree, and improves the overall crushing effect and product quality. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0013] Figure 1 It is a perspective view of the present application;

[0014] Figure 2 It is a sectional view of the present application;

[0015] Figure 3 It is a local perspective sectional view of the grinding cavity;

[0016] Figure 4 As Figure 3 A local enlarged view at the middle of the bag filter;

[0017] Figure 5 A local perspective view of the bag filter.

[0018] Wherein: 1, grinding cavity, 2, feeding device, 3, crushing air inlet, 4, discharging device, 5, guide tooth, 6, one-way discharge device, 7, discharge port, 8, discharge bin, 9, return pipe, 10, grinding disc, 11, driving motor, 12, center plate, 13, grinding ring, 14, annular plate, 15, spring telescopic rod, 16, T-shaped sliding groove, 17, cyclone separator, 18, upper fixed ring, 19, lower fixed ring, 20, filter bag, 21, vibration motor, 22, rocker. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] As Figures 1-4 shown, the utility model provides a airflow mill, including grinding cavity 1, grinding cavity 1 is connected with feeding device 2, crushing air inlet 3 and discharging device 4, the bottom surface in grinding cavity 1 is fixed with a plurality of guide tooth 5, the cross section of guide tooth 5 is triangle, and the side wall of grinding cavity 1 bottom end is equipped with one-way discharge device 6, one-way discharge device 6 is connected with discharge bin 8 through discharge port 7, and discharge bin 8 is connected with feeding device 2 through return pipe 9. The middle section of guide tooth 5 can be perpendicular to the airflow of air inlet 3, which facilitates the impact of the material on guide tooth 5.

[0021] In the process of crushing the material, the high-speed airflow drives the material to do circular motion in the grinding chamber 1. When the material hits the guide teeth 5 at high speed, part of its kinetic energy is converted into internal energy, resulting in the material being crushed. The crushed material, under the action of the high-speed airflow, will mostly continue to move along the inclined surface of the guide teeth 5 and gradually move away from the guide teeth 5, achieving the effect of being thrown up. The thrown-up material reduces the friction with the bottom of the grinding chamber 1, so that the high-speed airflow can more fully drive the broken material for separation. At the same time, the thrown-up material is fully dispersed in the grinding chamber 1 and can be impacted by the newly entering material in the grinding chamber 1, thereby improving the crushing efficiency. Under the action of the airflow, the large-particle material gradually moves to the outer circle of the grinding chamber 1, while the small-particle material gradually gathers to the center of the grinding chamber 1, and finally the small-particle material is extracted from the grinding chamber 1 by the discharge device 4. When the large-particle material gradually accumulates at the outer circle of the grinding chamber 1, the large-particle material can be discharged from the discharge port 7 into the discharge bin 8 by opening the one-way discharge device 6, and then they will enter the feeding device 2 along the return pipe 9, and then repeated crushing can be carried out to ensure the crushing effect of the material. A screw conveyor can be provided on the return pipe 9 to transport the large-particle material, thereby preventing the large-particle material from being blocked in the return pipe 9.

[0022] As shown in Figures 1-4 , the bottom end of the grinding chamber 1 is provided with a grinding disc 10, and the guide teeth 5 are fixed on the grinding disc 10. The bottom end outside the grinding chamber 1 is fixed with a driving motor 11, which drives the grinding disc 10 to rotate. The rotation direction of the grinding disc 10 is opposite to the rotation direction of the airflow entering through the crushing air inlet 3. The driving motor 11 can be an existing stepper motor or a servo motor.

[0023] In use, the driving motor 11 drives the grinding disc 10 to rotate, and the airflow drives the material to collide at high speed and the shearing force generated by the rotation of the grinding disc 10 to jointly crush the material more fully and reduce energy consumption and waste. The centrifugal force generated by the rotation of the grinding disc 10 helps to throw out the large-particle material stuck between the guide teeth 5, reduces the accumulation of material between the guide teeth 5, ensures the cleanliness of the guide teeth 5, and makes the subsequent material pass through more smoothly and be crushed.

[0024] As shown in Figures 2-4 , the top angle of the guide teeth 5 is 30-60 degrees. The top angle of the guide teeth 5 is in the range of 30-60 degrees, which can form a relatively gentle inclined surface, so that the resistance experienced by the material when moving along the guide teeth 5 is smaller, which helps the material to move more smoothly along the guide teeth 5 and reduces the accumulation and jamming of the material caused by excessive resistance.

[0025] As shown in Figure 3As shown, the grinding disc 10 includes a center plate 12, the outer periphery of the center plate 12 is sequentially provided with a plurality of grinding rings 13 with gradually increasing diameters, and the guide teeth 5 are evenly distributed on the grinding rings 13 along the axis of the center plate 12. The staggered guide teeth 5 can facilitate the outflow of the material, reduce the accumulation of the material between adjacent guide teeth 5, and help maintain the smooth flow of the material in the grinding cavity 1, thereby improving the operation efficiency and stability of the device. By providing the guide teeth 5 on different diameters, the total number of guide teeth 5 is increased, thereby increasing the contact area between the guide teeth 5 and the material, allowing more material to be simultaneously impacted and ground by the guide teeth 5, and ensuring the sufficient crushing of the material.

[0026] As shown in Figure 3 , 4 , the one-way discharging device 6 includes an annular plate 14, the inner side of the annular plate 14 is provided with a plurality of sliding blocks, the outer side of the grinding disc 10 is provided with a plurality of T-shaped sliding grooves 16 corresponding to the sliding blocks one by one, the sliding blocks slide along the T-shaped sliding grooves 16, the annular plate 14 slides along the axis direction of the grinding disc 10 through the T-shaped sliding grooves 16 and the sliding blocks, the bottom surface of the annular plate 14 is connected to the grinding cavity 1 through a plurality of spring expansion rods 15, the annular plate 14 cooperates with the grinding disc 10 to close the discharge port 7, the discharge port 7 connects the discharging bin 8 and the grinding cavity 1 in communication, and when the spring expansion rod 15 is compressed, the annular plate 14 moves downward along the T-shaped sliding groove 16 and opens the discharge port 7. The spring expansion rod 15 is a prior art.

[0027] In use, large-particle material will gradually accumulate at the outer ring position inside the grinding cavity 1, and when the amount of large-particle material gradually increases, the large-particle material compresses the spring expansion rod 15 through the annular plate 14 by using its own gravity, at this time the annular plate 14 moves downward along the T-shaped sliding groove 16 and opens the discharge port 7, effectively reducing the accumulation of the material in the grinding cavity 1, maintaining the cleanliness and smoothness of the grinding cavity 1, and improving the operation efficiency of the device. The large-particle material will enter the discharging bin 8 along the discharge port 7 for recycling crushing until the large-particle material can be extracted by the discharging device 4, ensuring that the material is fully crushed and improving the crushing efficiency, while also reducing the number of particles that are not crushed or not fully crushed. Moreover, the annular plate 14 is connected to the grinding disc 10, and the centrifugal force generated by the rotation of the grinding disc 10 can help the large-particle material to be more easily discharged to the discharge port 7 through the annular plate 14, making the discharging process more smooth.

[0028] As shown in Figure 2 , 5As shown, the discharging device 4 comprises a cyclone separator 17, the upper end of the cyclone separator 17 is provided with a gas outlet, the inner side wall of the cyclone separator 17 is fixed with an upper fixed ring 18 and a lower fixed ring 19, a filter cloth bag 20 is fixed between the upper fixed ring 18 and the lower fixed ring 19, the filter cloth bag 20 can cover the gas outlet, the bottom surface of the upper fixed ring 18 is fixed with a vibration motor 21, the vibration motor 21 is driven with a rocker 22, the rocker 22 can abut against the outer side wall of the filter cloth bag 20.

[0029] When the material is discharged by the discharging device 4, the fine material follows the airflow into the cyclone separator 17 and passes through the filter cloth bag 20, when the airflow passes through the filter cloth bag 20, the fine material is filtered by the filter cloth bag 20, by arranging the filter cloth bag 20, the fine material is filtered and remains in the cloth bag, which is convenient for subsequent collection and processing. After the crushing operation is completed, the vibration motor 21 is started, the vibration motor 21 drives the rocker 22 to rotate, the rocker 22 collides with the filter cloth bag 20 in the process of rotation, so that the filter cloth bag 20 is vibrated, ensuring that the fine material filtered by the filter cloth bag can be separated from the filter cloth bag 20, after the material is separated from the filter cloth bag 20, it can be collected by the discharge port of the cyclone separator 17, by driving the rocker 22 with the vibration motor 21, the filter cloth bag 20 can be cleaned, which reduces the difficulty and time of manual cleaning and improves the maintenance efficiency of the equipment. The filter cloth bag 20 can be an existing polyester filter bag, the vibration motor 21 is an existing stepping motor or a servo motor, and the cyclone separator 17 is the prior art.

[0030] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An air jet mill comprising a grinding chamber (1) which is connected to a feed device (2), a comminution gas inlet (3) and a discharge device (4), characterized in that: A plurality of guide teeth (5) are fixed on the bottom surface in the grinding cavity (1), the cross section of the guide teeth (5) is triangular, the bottom end of the grinding cavity (1) is provided with a one-way discharge device (6), the one-way discharge device (6) is communicated with a discharge bin (8) through a discharge port (7), and the discharge bin (8) is connected with the feeding device (2) through a return pipe (9).

2. A jet mill according to claim 1, characterised in that: The bottom end of the grinding cavity (1) is provided with a grinding disc (10), the axis of the grinding disc (10) coincides with the axis of the grinding cavity (1), the guide teeth (5) are all fixed on the grinding disc (10), the bottom end outside the grinding cavity (1) is fixed with a driving motor (11), the output shaft of the driving motor (11) drives the grinding disc (10), and the rotating direction of the grinding disc (10) is opposite to the rotating direction of the airflow entering the crushing air inlet (3).

3. A jet mill according to claim 1, characterized in that: The top angle of the guide tooth (5) is 30-60 degrees.

4. A jet mill according to claim 2, characterised in that: The grinding disc (10) comprises a center plate (12), a plurality of grinding rings (13) with gradually increasing diameters are sequentially arranged on the periphery of the center plate (12), and the guide teeth (5) are uniformly distributed on the grinding rings (13) along the axis of the center plate (12).

5. A jet mill according to claim 2, wherein: The one-way discharge device (6) comprises an annular plate (14), the inner side of the annular plate (14) is provided with a plurality of sliding blocks, the outer side of the grinding disc (10) is provided with T-shaped sliding grooves (16) corresponding to the sliding blocks, the sliding blocks slide along the T-shaped sliding grooves (16), the annular plate (14) slides along the axis direction of the grinding disc (10) through the T-shaped sliding grooves (16) and the sliding blocks, the bottom surface of the annular plate (14) is connected with the grinding cavity (1) through a plurality of spring telescopic rods (15), the annular plate (14) can close the discharge port (7) in cooperation with the grinding disc (10), the discharge port (7) connects the discharge bin (8) with the grinding cavity (1), when the spring telescopic rod (15) is compressed, the annular plate (14) moves downward along the T-shaped sliding groove (16) and opens the discharge port (7).

6. A jet mill according to claim 1, characterized in that: The discharge device (4) comprises a cyclone separator (17), the upper end of the cyclone separator (17) is provided with an air outlet, the inner side wall of the cyclone separator (17) is fixed with an upper fixed ring (18) and a lower fixed ring (19), a filter cloth bag (20) is fixed between the upper fixed ring (18) and the lower fixed ring (19), the filter cloth bag (20) can cover the air outlet, the bottom surface of the upper fixed ring (18) is fixed with a vibration motor (21), the vibration motor (21) drives a rocker (22), and the rocker (22) can abut against the outer side wall of the filter cloth bag (20).

Images