Air mixer for powders

Abstract

The present application relates to a kind of air mixers for powder, including air blowing device, the mixing pipe connected with air blowing device in lower end, mixing bin, mixing pipe is inclined from lower to upper, and it is equipped with at least two feed ports on it, mixing bin includes mixing cylinder, first material hopper connected below mixing cylinder, mixing pipe upper end is connected with the lateral wall of mixing cylinder, the profile line of the inner wall of mixing pipe far from the axis of mixing cylinder one side is substantially tangent to the profile line of the inner wall of mixing cylinder, so that the airflow in mixing cylinder forms cyclone, the inner wall of mixing cylinder is equipped with several first baffles from the upstream to downstream of cyclone airflow direction, mixing cylinder inside is equipped with dust collecting tube coaxial with it and top end extends mixing cylinder, first material hopper bottom is equipped with first discharge port.The present application mixes powder by airflow, reduces later maintenance cost;And processing process does not need to stop, improves processing efficiency;While it can avoid the cost increase and yield reduction caused by residual powder.

Description

Technical Field

[0001] This invention relates to an air mixer for powder materials, and is applicable to the field of powder material processing technology. Background Technology

[0002] In many fields such as cement, metallurgy, and dry-mixed mortar, it is necessary to mix various powdered materials in a certain proportion to process them into a mixture that meets the application requirements. Most existing technologies use mixing tanks to achieve the mixing of multiple powders. For example, the mixing device disclosed in patent application number 202010282631.2 involves adding a certain amount of powder to a hopper, and then using a motor to drive a stirring shaft extending into the tank to stir and produce the desired mixture. However, the processing capacity of such devices is limited by the capacity of their hopper. After each processing cycle, the machine must be stopped to collect the product before the next cycle can begin, resulting in low production efficiency. Furthermore, because the stirring shaft constantly rubs against the powder particles during the mixing process, the blades are prone to wear after prolonged use, requiring frequent replacement of parts. Moreover, powder particles can easily accumulate in the bearings of the stirring shaft, causing the shaft to rotate poorly and eventually leading to device damage. Therefore, such devices generate significant ongoing maintenance costs. In addition, during the mixing process, powder can easily remain in areas that the stirring shaft cannot reach, increasing the manpower and resources required for cleaning the hopper. The residual powder can also easily mix into different mixtures in subsequent processing, affecting the product yield. Summary of the Invention

[0003] To address the shortcomings of the existing technology, this invention proposes an air mixer for powder materials.

[0004] The technical solution adopted in this invention is: an air mixer for powder materials, comprising:

[0005] A blower is used to provide a high-speed airflow to mix various powders. Specifically, the blower can be a Roots blower or a high-pressure air tank, which can improve the stability of the airflow.

[0006] The mixing pipe is inclined from bottom to top and connected to the blower at the bottom. The mixing pipe has at least two feed inlets. When different types of powder enter the feed inlets, the high gas velocity inside the mixing pipe can generate negative pressure and draw the powder into the mixing pipe, thus feeding the mixer. The inclined mixing pipe can provide an upward trend for the powder after the high-speed airflow carries it into the mixing hopper, preventing the powder from falling into the hopper below without being fully mixed, and ensuring the mixing effect of the powder.

[0007] The mixing silo includes a cylindrical mixing cylinder and a funnel-shaped first collecting hopper connected below the mixing cylinder. The upper end of a mixing pipe is connected to the side wall of the mixing cylinder, and its projection on a plane perpendicular to the axis of the mixing cylinder is such that the contour line of the inner wall of the mixing pipe on the side away from the axis of the mixing cylinder is substantially tangent to the contour line of the inner wall of the mixing cylinder, causing the airflow entering the mixing cylinder to form a cyclone. Since the high-speed airflow in the mixing pipe enters the mixing cylinder at an upward angle, the cyclone formed inside the mixing cylinder is also spiraling upwards. It should be noted that... Yes, "basic tangency" here refers to the situation where the mixing pipe and the mixing cylinder are not precisely tangent due to certain errors in the manufacturing, processing and installation process. The inner wall of the mixing cylinder is provided with several first guide vanes that are inclined from the upstream to the downstream of the cyclone airflow direction and from bottom to top. The mixing cylinder is provided with a dust collection pipe that is open at the bottom and extends from the upper wall of the mixing cylinder at the top. The axis of the dust collection pipe coincides with the axis of the mixing cylinder. The bottom of the first collection hopper is provided with a first discharge port.

[0008] After the powder is drawn into the mixing pipe, it undergoes initial mixing. Subsequently, the powder is ejected from the mixing pipe into the mixing cylinder by a high-speed airflow, spiraling upwards along the inner wall of the cylinder and undergoing secondary mixing. After circling the inner wall of the mixing cylinder, the powder collides with powder subsequently ejected from the mixing pipe, resulting in tertiary mixing. The first guide vane on the inner wall of the mixing cylinder guides the airflow, maintaining an upward trend, and also alters the direction of some powder movement, producing a quaternary mixing effect. Ultimately, this ensures the quality of the product processed by the mixer. As the high-speed airflow continuously carries in powder, the powder concentration in the mixing cylinder increases, and some powder gradually detaches from the spiral airflow and falls into the first collection hopper below, making it convenient for operators to collect the product through the first discharge port. The dust collection pipe can discharge excess gas from the mixer, preventing the blower from continuously supplying gas and causing excessive air pressure inside the mixer, thus ensuring the normal operation of the mixer. Furthermore, since the dust collection pipe is located in the middle of the mixing cylinder, most of the powder will move along the inner wall of the mixing cylinder under the action of centrifugal force, which can prevent a large amount of powder from being discharged by the dust collection pipe.

[0009] Furthermore, the inner wall of the mixing pipe is provided with several inclined second guide vanes that form a spiral airflow within the mixing pipe, and these second guide vanes are all located downstream of the feed inlet. The second guide vanes cause the high-speed airflow to form a spiral wind, which can further improve the initial mixing effect.

[0010] Furthermore, the inner wall of the mixing cylinder is also provided with several third guide vanes. The third guide vanes are inclined from upstream to downstream in the direction of the cyclone airflow. The third guide vanes are distributed intermittently and randomly among the first guide vanes along the airflow direction, which can generate a small range of turbulence. This can work with the first guide vanes to cause the powder in the airflow to be randomly redirected, further improving the effect of the four-stage mixing.

[0011] Furthermore, the air mixer also includes a dust collection device whose input end is connected to the dust collection pipe and is used to extract gas from the mixing chamber. The dust collection device includes a filter chamber and a second collection hopper in the shape of a funnel located below the filter chamber. The filter chamber is equipped with a filter element, which divides the filter chamber into a filter material area connected to the input end of the dust collection device and an exhaust area with an exhaust port. The second collection hopper is connected to the filter material area. When the dust collection device discharges excess gas from the mixer, a small amount of powder dust will be mixed in the gas. The powder dust in the gas can be filtered out through the filter chamber and added back into the mixer through the second collection hopper. Furthermore, by placing the filter element in the dust collection device, the volume of the mixing chamber can be increased, which would be avoided if the filter element were placed directly in the dust collection pipe, thereby improving the flexibility of the mixer.

[0012] Furthermore, the filter chamber is also equipped with a dust-shaking device to shake off the residual powder on the filter element, which facilitates the removal of the powder accumulated on the filter element and prevents the filter element from clogging. Specifically, the dust-shaking device can be set as a pulse gas generator, and the airflow direction of the pulse gas generator is parallel to the filter surface of the filter element, which facilitates the blowing off of the powder on the filter element.

[0013] Furthermore, the bottom of the second hopper is provided with a second discharge port that is connected to the mixing pipe. The connection between the second discharge port and the mixing pipe is located upstream of the feed inlet, which facilitates the remixing of the powder filtered out by the filter element.

[0014] Furthermore, the angle between the axis of the mixing tube and the horizontal plane is 10±3°. This not only avoids insufficient mixing of powder due to an excessively low airflow angle, but also avoids excessively high angles that would cause the airflow to rise too quickly, resulting in a large amount of turbulence, thus ensuring the stability of the spiral airflow inside the mixing tube.

[0015] Furthermore, the upper end of the mixing pipe is connected to the lower part of the mixing cylinder, providing a certain space for the formation of the spiral airflow, which not only ensures the effect of powder mixing, but also guarantees the stability of the spiral airflow.

[0016] Furthermore, both the inlet and the first outlet are equipped with rotary valves to ensure smooth product addition and collection while preventing gas leakage.

[0017] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0018] The air mixer for powder materials of the present invention achieves powder mixing through airflow, eliminating the need for accessories such as stirring shafts, thus reducing the cost of later equipment maintenance; furthermore, it can collect products during processing without stopping the machine to unload materials, and the processing volume is not limited by the volume of the mixing hopper, improving product processing efficiency; at the same time, the airflow mixing eliminates dead corners inside the mixer, avoiding the increased costs and reduced yield caused by residual powder. Attached Figure Description

[0019] The following sections will describe some specific embodiments of the invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0020] Figure 1 This is a schematic diagram of a structure according to an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 The front view of the embodiment shown;

[0022] Figure 3 yes Figure 1 The schematic diagram of the mixing bin in the embodiment shown is provided, in which the upper wall of the mixing bin is omitted to show the internal structure of the mixing bin;

[0023] Figure 4 yes Figure 2 A cross-sectional view of AA in the illustrated embodiment;

[0024] Figure 5 yes Figure 1 Top view of the embodiment shown;

[0025] The reference numerals in the attached figures are explained as follows:

[0026] 1. Blower; 2. Mixing pipe; 21. Feed inlet; 22. Second guide vane; 3. Mixing bin; 31. Mixing cylinder; 311. First guide vane; 32. First hopper; 33. Dust collection pipe; 34. First outlet; 35. Third guide vane; 4. Dust collection device; 41. Filter chamber; 42. Second hopper; 43. Filter element; 44. Filter media area; 45. Exhaust port; 46. Exhaust area; 47. Dust shaking device; 48. Second outlet. Detailed Implementation

[0027] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the technical features involved in the different embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0029] Reference Appendix Figure 1-5 This embodiment provides an air mixer for powder materials, comprising:

[0030] Blower 1 is used to provide a high-speed airflow to mix various powders together. Specifically, blower 1 can be set as a Roots blower or a high-pressure air tank, which can improve the stability of the airflow.

[0031] The mixing pipe 2 is inclined from bottom to top and its lower end is connected to the blower 1. The mixing pipe 2 is provided with at least two feed inlets 21. When different types of powder enter the feed inlets 21, due to the high gas velocity in the mixing pipe 2, a negative pressure can be generated to draw the powder into the mixing pipe 2, thereby adding material to the mixer. The inclined mixing pipe 2 can provide an upward trend for the powder after the high-speed airflow carries it into the mixing bin 3, preventing the powder from falling into the hopper below without being fully mixed, thus ensuring the mixing effect of the powder.

[0032] The mixing chamber 3 includes a cylindrical mixing cylinder 31 and a funnel-shaped first collecting hopper 32 connected below the mixing cylinder 31. The upper end of the mixing pipe 2 is connected to the side wall of the mixing cylinder 31, and its projection on a plane perpendicular to the axis of the mixing cylinder 31 is such that the contour line of the side of the inner wall of the mixing pipe 2 away from the axis of the mixing cylinder 31 is basically tangent to the contour line of the inner wall of the mixing cylinder 31, causing the airflow entering the mixing cylinder 31 to form a cyclone. Since the high-speed airflow in the mixing pipe 2 enters the mixing cylinder 31 at an upward angle, the cyclone formed in the mixing cylinder 31 is also spiraling upward. It should be noted that... The term "basically tangent" here refers to the fact that due to certain errors in the manufacturing, processing and installation processes, the mixing pipe 2 and the mixing cylinder 31 are not precisely tangent. The inner wall of the mixing cylinder 31 is provided with several first guide vanes 311 that are inclined from the upstream to the downstream of the cyclone airflow direction. The mixing cylinder 31 is provided with a dust collection pipe 33 that is open at the bottom and extends from the upper wall of the mixing cylinder 31 at the top. The axis of the dust collection pipe 33 coincides with the axis of the mixing cylinder 31. The bottom of the first collecting hopper 32 is provided with a first discharge port 34.

[0033] After the powder is drawn into the mixing pipe 2, it undergoes initial mixing. Subsequently, the powder, carried by a high-speed airflow, is sprayed from the mixing pipe 2 into the mixing cylinder 31, spiraling upwards along the inner wall of the mixing cylinder 31, where it undergoes secondary mixing. After circling the inner wall of the mixing cylinder 31, the powder collides with powder subsequently sprayed from the mixing pipe 2, resulting in tertiary mixing. The first guide vane 311 on the inner wall of the mixing cylinder 31 guides the airflow, maintaining an upward trend, and also alters the movement direction of some of the powder, producing a quaternary mixing effect. Ultimately, this ensures the quality of the product processed by the mixer. As the high-speed airflow continuously carries in powder, the powder concentration in the mixing cylinder 31 increases, and some powder gradually detaches from the spiral airflow and falls into the first collecting hopper 32 below, making it convenient for operators to collect the product through the first discharge port 34. The dust collection pipe 33 can discharge excess gas in the mixer, preventing the blower 1 from continuously supplying gas and causing excessive air pressure inside the mixer, thus ensuring the normal operation of the mixer. Furthermore, since the dust collection pipe 33 is located in the middle of the mixing cylinder 31, most of the powder will move along the inner wall of the mixing cylinder 31 under the action of centrifugal force, which can prevent a large amount of powder from being discharged by the dust collection pipe 33.

[0034] In a more preferred embodiment, the inner wall of the mixing pipe 2 is provided with a plurality of inclined second guide vanes 22 that cause the airflow in the mixing pipe 2 to form a spiral airflow, and the plurality of second guide vanes 22 are all located downstream of the feed inlet 21. The second guide vanes 22 cause the high-speed airflow to form a spiral wind, which can further improve the effect of preliminary mixing.

[0035] In a more preferred embodiment, the inner wall of the mixing cylinder 31 is further provided with a number of third guide vanes 35. The third guide vanes 35 are inclined from upstream to downstream in the direction of the cyclone airflow. The third guide vanes 35 are distributed alternately and randomly among the first guide vanes 311 along the airflow direction, which can generate a small range of turbulence. They can work with the first guide vanes 311 to cause the powder in the airflow to be randomly redirected, further improving the effect of the four-stage mixing.

[0036] In a more preferred embodiment, the air mixer further includes a dust collection device 4 whose input end is connected to the dust collection pipe 33 and is used to extract gas from the mixing chamber 3. The dust collection device 4 includes a filter chamber 41 and a second collection hopper 42 arranged below the filter chamber 41 and in the shape of a funnel. A filter element 43 is provided in the filter chamber 41, and the filter element 43 divides the filter chamber 41 into a filter material area 44 connected to the input end of the dust collection device 4 and an exhaust area 46 provided with an exhaust port 45. The second collection hopper 42 is connected to the filter material area 44. When the dust collection device 4 discharges excess gas from the mixer, a small amount of powder dust will be mixed in the gas. The powder dust in the gas can be filtered out through the filter chamber 41 and added back into the mixer through the second collection hopper 42. Furthermore, by placing the filter element 43 in the dust collection device 4, the volume of the mixing chamber 3 can be increased by directly placing the filter element 43 in the dust collection pipe 33, thereby improving the flexibility of the mixer.

[0037] In a more preferred embodiment, the filter chamber 41 is further provided with a dust-shaking device 47 for shaking off the residual powder on the filter element 43, so as to facilitate the shaking off the powder accumulated on the filter element 43 and prevent the filter element 43 from clogging. In this embodiment, the dust-shaking device 47 is set as a pulse gas generator, and the airflow direction of the pulse gas generator is parallel to the filter surface of the filter element 43, so as to facilitate the blowing off of the powder on the filter element.

[0038] In a more preferred embodiment, the bottom of the second hopper 42 is provided with a second discharge port 48 that is connected to the mixing pipe 2. The connection between the second discharge port 48 and the mixing pipe 2 is located upstream of the feed inlet 21, which facilitates the remixing of the powder filtered out by the filter element 43.

[0039] In a more preferred embodiment, the angle between the axis of the mixing pipe 2 and the horizontal plane is 10±3°. This not only avoids insufficient mixing of powder due to the airflow entering at too low an angle, but also avoids excessively high an angle that causes the airflow to rise too quickly, resulting in a large amount of turbulence, thus ensuring the stability of the spiral airflow inside the mixing cylinder 31.

[0040] In a more preferred embodiment, the upper end of the mixing pipe 2 is connected to the lower part of the mixing cylinder 31, providing a certain space for the formation of the spiral airflow, which not only ensures the effect of powder mixing, but also guarantees the stability of the spiral airflow.

[0041] In a more preferred embodiment, both the inlet 21 and the first outlet 34 are equipped with star-shaped ash discharge valves (not shown in the attached drawings), which can ensure smooth addition and collection of products while preventing gas leakage.

[0042] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0043] The air mixer for powder materials of the present invention achieves powder mixing through airflow, eliminating the need for accessories such as stirring shafts, thus reducing the cost of later equipment maintenance; furthermore, it can collect products during processing without stopping the machine to unload materials, and the processing volume is not limited by the volume of the mixing hopper, improving product processing efficiency; at the same time, the airflow mixing eliminates dead corners inside the mixer, avoiding the increased costs and reduced yield caused by residual powder.

[0044] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An air mixer for powder materials, characterized in that, include: Blower (1); Mixing pipe (2), which is inclined from bottom to top and connected at the bottom end to the blower (1), and at least two feed inlets (21) are provided on the mixing pipe (2). A mixing bin (3) includes a cylindrical mixing cylinder (31) and a funnel-shaped first collecting hopper (32) connected below the mixing cylinder (31). The upper end of the mixing pipe (2) is connected to the side wall of the mixing cylinder (31), and its projection on a plane perpendicular to the axis of the mixing cylinder (31) is such that the outline of the inner wall of the mixing pipe (2) away from the axis of the mixing cylinder (31) is substantially tangent to the outline of the inner wall of the mixing cylinder (31), allowing the material to enter the mixing bin. The airflow inside the mixing cylinder (31) forms a cyclone. The inner wall of the mixing cylinder (31) is provided with a number of first guide vanes (311) that are inclined from the upstream to the downstream of the airflow direction of the cyclone. The mixing cylinder (31) is provided with a dust collection pipe (33) with an open bottom and a top extending from the upper wall of the mixing cylinder (31). The axis of the dust collection pipe (33) coincides with the axis of the mixing cylinder (31). The bottom of the first collection hopper (32) is provided with a first discharge port (34). The inner wall of the mixing cylinder (31) is also provided with a number of third guide vanes (35). The third guide vanes (35) are inclined from upstream to downstream of the airflow direction of the cyclone. The angle between the axis of the mixing pipe (2) and the horizontal plane is 10±3°. The upper end of the mixing pipe (2) is connected to the lower part of the mixing cylinder (31).

2. The air mixer for powder materials according to claim 1, characterized in that: The inner wall of the mixing pipe (2) is provided with a plurality of inclined second guide vanes (22) that cause the airflow in the mixing pipe (2) to form a spiral airflow, and the plurality of second guide vanes (22) are all located downstream of the feed inlet (21).

3. The air mixer for powder materials according to claim 1, characterized in that: The air mixer also includes a dust collection device (4) whose input end is connected to the dust collection pipe (33) and is used to extract the gas in the mixing bin (3). The dust collection device (4) includes a filter chamber (41) and a second collection hopper (42) arranged below the filter chamber (41) and in the shape of a funnel. The filter chamber (41) is provided with a filter element (43), and the filter element (43) divides the filter chamber (41) into a filter material area (44) connected to the input end of the dust collection device (4) and an exhaust area (46) provided with an exhaust port (45). The second collection hopper (42) is connected to the filter material area (44).

4. The air mixer for powder materials according to claim 3, characterized in that: The filter chamber (41) is also equipped with a dust-shaking device (47) for shaking off the residual powder on the filter element (43).

5. The air mixer for powder materials according to claim 3, characterized in that: The bottom of the second collection hopper (42) is provided with a second discharge port (48) that is connected to the mixing pipe (2). The connection between the second discharge port (48) and the mixing pipe (2) is located upstream of the feed inlet (21).

6. The air mixer for powder materials according to claim 1, characterized in that: Both the feed inlet (21) and the first discharge outlet (34) are equipped with star-shaped ash discharge valves.

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