A wind selection wind internal circulation powder particle material separation device

Abstract

The utility model relates to a kind of powder and particle material separating device of air selection air inner circulation, solve the existing fresh air air selection dust removal device uses disposable fresh air, leading to high energy consumption and environmental protection pressure is big and the existing vibrating screen is not conducive to the dust adhered to the surface of granular material and granular material separation, prone to failure, dust emission to external environment easy to cause pollution problem, the powder and particle material of the utility model falls in the form of thin curtain after the outlet of powder and particle material downcomer bottom narrow slit, thin wind curtain that blows out from narrow slit one end of self-blowing pipe way blows powder in powder and particle material to dust downflush channel, granular material falls into granular material discharge channel, the wind that enters return air static dust bin from dust downflush channel slows down due to its cross-sectional area increases, dust brought into return air static dust bin naturally settles and falls into powder bin, cleaner wind enters return air pipe, realize cyclic use;Form micro negative pressure in device by connecting air extraction device with negative pressure air extraction port, avoid dust to come out.

Description

Technical Field

[0001] This utility model relates to an air separation device, specifically to an air separation device for separating powder and granular materials with internal air circulation. Background Technology

[0002] In the production of granular materials such as urea, granules and powders often coexist. In the final packaging stage, they need to be separated and packaged separately. Commonly used separation devices include vibrating screens and fresh air separation dust collectors. Vibrating screens work by utilizing the diameter difference between granules and powders, using vibration to sift the powder through a filter screen while retaining only the granules. Fresh air separation dust collectors work by utilizing the different degrees to which granules and powders are affected by airflow, using airflow to cause them to fall at different positions, thus separating them. However, both of these devices have the following problems when in use:

[0003] 1) The fresh air dust removal device uses fresh air for air separation, but the fresh air is only used once and is not recycled, resulting in high energy consumption and great environmental pressure.

[0004] 2) Vibrating screens are not good at separating flaky dust and dust adhering to the surface of granular materials from the granular materials. Moreover, vibrating screens are prone to generating secondary dust during operation. The dust is released into the external environment, which can easily cause environmental pollution. Utility Model Content

[0005] The purpose of this invention is to solve the technical problems of existing fresh air separation dust removal devices that use disposable fresh air, resulting in high energy consumption and great environmental pressure, as well as the existing vibrating screens that are not good at separating flaky dust and dust adhering to the surface of granular materials from the granular materials, are prone to failure, and the dust is easily emitted into the external environment, causing pollution. The invention provides a powder and granular material separation device with internal air circulation for air separation.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A powder / granular material separation device with internal air circulation and air classifier, characterized by:

[0008] It includes a powder and granular material feeding hopper, a separation chamber, a granular material discharge channel, a dust flushing channel, a return air and dust silo, a return air duct, a blower, and a blower duct;

[0009] The top of the separation chamber is provided with a feed inlet, the powder material discharge hopper is located at the feed inlet, and the bottom of the powder material discharge hopper is provided with an outlet, which is a narrow slit.

[0010] The bottom of the separation chamber is provided with a granular material separation port and a dust separation port. The granular material separation port is located below the outlet of the powder material hopper, and the dust separation port is located in front of the granular material separation port. The granular material discharge channel and the dust flushing channel are respectively connected to the granular material separation port and the dust separation port. The bottom of the granular material discharge channel is provided with a granular material discharge port, which is used to connect to a conveyor or a silo.

[0011] The return air dust chamber is located in front of the dust downflow channel. A dust collection inlet is opened at the bottom of the return air dust chamber, and a powder outlet is opened at the bottom of the dust downflow channel. The dust collection inlet is connected to the powder outlet, and the powder outlet is used to connect to the powder chamber. The cross-sectional area of ​​the return air dust chamber gradually increases from the bottom to the top.

[0012] The air outlet of the blower is connected to one end of the blowing pipe, and the other end is located between the outlet at the bottom of the powder and granular material hopper and the granular material separation port, and is connected to the rear side wall of the separation chamber. The end of the blowing pipe connected to the rear side wall of the separation chamber is a narrow slit, and its length direction is parallel to the length direction of the bottom outlet of the powder and granular material hopper. The air inlet of the blower is connected to one end of the return air pipe, and the other end of the return air pipe is connected to the upper part of the return air dust hopper.

[0013] The outer wall of the upper part of the return air dust chamber is provided with a negative pressure exhaust port, which is connected to the return air dust chamber and is used to connect an exhaust device.

[0014] Furthermore, one end of the blower duct is circular and connected to the air outlet of the fan. The shape of the blower duct gradually changes from circular to narrow slit from one end to the other, and the cross-sectional area of ​​the blower duct gradually decreases.

[0015] Furthermore, the return air duct, the fan, and the blowing duct constitute an internal circulation pipeline. The height of the entire internal circulation pipeline gradually decreases from the end where the return air duct is connected to the return air dust chamber to the end where the blowing duct is connected to the rear side wall of the separation chamber. The projection of the bottom surface of the blowing duct in the plane perpendicular to the length direction of the powder material hopper outlet gradually decreases from the end connected to the fan to the other end.

[0016] The top of the return air dust chamber is equipped with a switch cover.

[0017] Furthermore, the blower duct is provided with a blower duct flange at one end near the fan outlet, and the return air duct is provided with a return air duct flange at one end near the fan inlet, and there is an angle θ between the plane where the blower duct flange is located and the plane where the return air duct flange is located.

[0018] A wedge assembly is provided between the fan and the blower duct flange or return air duct flange, including a flange plate and a wedge-shaped pipe. There are two flange plates, which are respectively set at both ends of the wedge-shaped pipe. The two end faces of the wedge-shaped pipe have an included angle of θ. One of the two flange plates is connected to the air inlet or outlet of the fan, and the other is connected to the return air duct flange or blower duct flange.

[0019] Furthermore, the fan is an adjustable speed fan.

[0020] Furthermore, one of the two flange plates is bolted to the air inlet or outlet of the fan, and the other flange plate is bolted to the return air duct flange or the blower duct flange.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] (1) The present invention provides a powder and granular material separation device with air-separated internal air circulation. Utilizing the characteristic that granular materials are less affected by wind force, while powder and dust are greatly affected, when the powder and granular materials pass through the bottom outlet of the powder and granular material hopper, because the outlet is narrow, the powder and granular materials will fall in the separation chamber in the form of a thin curtain. The air generated by the blower forms a thin air curtain after passing through one end of the narrow air duct. This thin air curtain blows onto the thin curtain formed by the falling powder and granular materials, separating the granular materials from the powder. The dust adhering to the granular materials is also blown away. The separated granular materials fall into the granular material discharge channel and enter the next process, while the separated powder falls into the dust flushing channel. Inside the powder silo, finer dust particles are carried by the wind into the return air dust silo. Because the cross-sectional area of ​​the return air dust silo gradually increases from bottom to top, the wind speed slows down. The dust particles carried into the return air dust silo naturally settle down into the powder silo below due to the reduced speed. Meanwhile, cleaner air enters the return air duct, forming an internal circulation of "air outlet - air blowing duct - separation silo - dust flushing channel - return air dust silo - return air duct - air inlet". This achieves air recycling, reduces energy consumption, and the suction device connected to the negative pressure exhaust port creates a slight negative pressure inside the entire device, preventing dust from escaping from the inlet of the powder material hopper and the outlet of the granular material, thus preventing dust pollution of the environment.

[0023] (2) This utility model provides a powder and granular material separation device with internal air circulation and air classifier. The return air duct, blower, and blowing duct constitute an internal circulation pipeline. The height of the entire internal circulation pipeline gradually decreases from the end where the return air duct connects to the return air dust chamber to the end where the blowing duct connects to the rear wall of the separation chamber. Because dust accumulates on the inner wall of the internal circulation pipeline after a period of use, it needs to be cleaned periodically with high-pressure steam or water. High-pressure steam or water can be introduced into the internal circulation pipeline by opening and closing the cover. Because of the height difference in the internal circulation pipeline, the cleaning water flows into the granular material discharge channel along the internal circulation pipeline. The material is discharged from the granular material outlet. Because the shape of the blowing pipe gradually changes from a circle to a narrow slit from one end to the other, its projection in the plane perpendicular to the length direction of the outlet of the granular material hopper is approximately triangular. If the blowing pipe is inclined downwards as a whole, but its bottom surface gradually increases in height from the end connected to the blower to the other end, this will also cause cleaning water to accumulate. Therefore, in this utility model, the projection of the bottom surface of the blowing pipe in the plane perpendicular to the length direction of the outlet of the granular material hopper gradually decreases in height from the end connected to the blower to the other end. This setting can prevent cleaning water from accumulating at the blowing pipe.

[0024] (3) The powder material separation device with air separation and internal air circulation provided by this utility model is also equipped with a wedge component. Because the traditional fan and pipe connection, the flanges on the two opposite end faces of the two pipes are parallel to each other, and the distance between the two flanges is just matched with the fan. There is no extra adjustable gap. When installing the fan, it is necessary to accurately align the position before pushing it in for installation. The fan is very heavy, which makes the installation process very difficult. In this utility model, the plane where the blowing pipe flange is located and the plane where the return air pipe flange is located have an angle θ. After the wedge component is connected to the fan, it forms a whole. The end face of the fan and the plane where the flange plate is located will also have an angle θ. In this way, when installing, the narrowest part of the whole formed by the connection of the wedge component and the fan is pushed in from the farthest distance between the blowing pipe flange and the return air pipe flange, which facilitates the installation of the fan. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of a powder and granular material separation device with air separation and internal air circulation according to the present invention.

[0026] Figure 2 This is a schematic diagram showing the location and structure of the separation chamber, the particle discharge channel, the dust flushing channel, and the return air dust chamber in an embodiment of the powder and granular material separation device with air separation and internal air circulation of this utility model.

[0027] Figure 3 This is a schematic diagram of the structure of the powder material feeding hopper in an embodiment of the powder material separation device with air separation and internal air circulation of this utility model;

[0028] Figure 4 This is a schematic diagram of the air blowing pipe in an embodiment of the powder and granular material separation device with air separation and internal air circulation according to this utility model;

[0029] Figure 5 This is a schematic diagram of the installation of the wedge-shaped component in an embodiment of a powder and granular material separation device with air separation and internal air circulation according to this utility model;

[0030] Figure 6 This is a schematic diagram of the installation of the return air duct flange and the blowing air duct flange in an embodiment of a powder material separation device with air separation and internal air circulation according to the present invention.

[0031] Figure 7 This is a three-dimensional structural diagram of the wedge-shaped component in an embodiment of a powder and granular material separation device with air separation and internal air circulation according to this utility model.

[0032] Figure 8 This is a three-dimensional structural diagram of the blower in an embodiment of a powder and granular material separation device with internal air circulation according to the present invention.

[0033] The annotations in the attached figures are explained as follows:

[0034] 1-Powder / granular material feeding hopper, 2-Separation bin, 3-Particle material discharge channel, 4-Dust flushing channel,

[0035] 5-Return air dust chamber, 51-Negative pressure exhaust port; 6-Return air duct, 61-Return air duct flange; 7-Fan, 8-Blowing duct, 81-Blowing duct flange; 9-Switch cover plate, 10-Wedge assembly, 101-Flange plate, 102-Wedge duct. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and exemplary embodiments.

[0037] Reference Figures 1-8 The present invention provides a powder and granular material separation device with air separation and internal air circulation, comprising a powder and granular material feeding hopper 1, a separation chamber 2, a granular material discharge channel 3, a dust flushing channel 4, a return air and dust silo 5, a return air duct 6, a blower 7, and a blowing duct 8.

[0038] The top of the separation chamber 2 has a feed inlet, and the powder material discharge hopper 1 is located at the feed inlet position, with the structure as follows: Figure 3 As shown, an outlet is provided at the bottom of the chamber. The outlet is a narrow slit, so that the material falling into the separation chamber 2 from the powder material feed hopper 1 will fall in the form of a thin curtain. During air separation, the contact area with the air blown by the blower 7 is larger, and the air separation efficiency is higher.

[0039] like Figure 2As shown, the bottom of the separation chamber 2 is equipped with a granular material separation port and a dust separation port. The granular material separation port is located below the outlet of the powder material hopper 1, and the dust separation port is located in front of the granular material separation port. The granular material discharge channel 3 and the dust flushing channel 4 are connected to the granular material separation port and the dust separation port, respectively. This arrangement is because the granular material in the powder material has a larger diameter and weight, and is less affected by wind. Therefore, its falling trajectory after air separation is almost a straight line, hence the granular material separation port is located directly below the outlet of the powder material hopper 1. Conversely, the powder material in the powder material has a smaller diameter and weight, and is more affected by wind. After air separation, its falling trajectory is almost a parabola and farther than the landing point of the granular material. Therefore, the dust separation port is located in front of the granular material separation port. At the bottom of the granular material discharge channel 3, there is a granular material discharge port, which is used to connect to a conveyor or silo to collect the separated granular material.

[0040] The return air dust chamber 5 is located in front of the dust downflow channel 4, and the cross-sectional area of ​​the return air dust chamber 5 gradually increases from bottom to top. A dust collection inlet is opened at the bottom of the return air dust chamber 5, and a powder outlet is opened at the bottom of the dust downflow channel 4. The dust collection inlet is connected to the powder outlet, and the powder outlet is connected to the powder hopper. The return air dust chamber 5 is designed this way because dust lighter than powder will enter it with the wind. Since the cross-sectional area of ​​the return air dust chamber 5 gradually increases from bottom to top, the wind speed will gradually slow down, and the dust will naturally settle into the powder hopper and be collected together with the powder.

[0041] A negative pressure exhaust port 51 is provided on the outer wall of the upper part of the return air dust chamber 5, and the negative pressure exhaust port 51 is connected to the return air dust chamber 5. The negative pressure exhaust port 51 is used to connect the exhaust device. When performing air separation, the exhaust device exhausts air to keep the entire device in a slightly negative pressure state, preventing dust from escaping from the inlet of the powder material hopper 1 and the granular material outlet, thus protecting the environment.

[0042] In this embodiment, the blower 7 is an adjustable-speed blower, which allows the degree of separation between powder and granular materials to be controlled by adjusting the speed of the blower 7. The outlet of the blower 7 is connected to one end of the blowing pipe 8, and the other end is located between the outlet at the bottom of the powder / granular material hopper 1 and the granular material separation port, and is connected to the rear wall of the separation chamber 2. The end of the blowing pipe 8 connected to the rear wall of the separation chamber 2 is a narrow slit, and its length is parallel to the length of the bottom outlet of the powder / granular material hopper 1. The structure of the blowing pipe 8 is as follows: Figure 4 As shown, one end of the blower duct is circular and connected to the air outlet of the blower 7. The shape of the blower duct 8 gradually changes from circular to narrow slit from one end to the other, and the cross-sectional area gradually decreases. This design helps to increase the wind speed and wind pressure. The air inlet of the blower 7 is connected to one end of the return air duct 6, and the other end of the return air duct 6 is connected to the upper part of the return air dust chamber 5.

[0043] Thus, the return air duct 6, the fan 7, and the blowing duct 8 constitute an internal circulation pipeline. The air blown out by the fan 7 forms an internal circulation loop: "air outlet - blowing duct 8 - separation chamber 2 - dust flushing channel 4 - return air dust chamber 5 - return air duct 6 - air inlet". After a period of use, dust will adhere to the inner wall of the internal circulation pipeline, so it needs to be cleaned regularly with high-pressure steam or water. This utility model has a switch cover 9 on the top of the return air dust chamber 5, which allows high-pressure steam or water to be introduced into the internal circulation pipeline. Because the height of the internal circulation pipeline gradually decreases from the end where the return air duct 6 connects to the return air dust chamber 5 to the end where the blowing duct 8 connects to the rear wall of the separation chamber 2, the height difference allows for the flow of cleaning water. The material flows into the granular material discharge channel 3 through the internal circulation pipe and is finally discharged from the granular material discharge port. Because the shape of the blowing pipe 8 gradually changes from a circle to a narrow slit from one end to the other, its projection in the plane perpendicular to the length direction of the outlet at the bottom of the granular material hopper 1 is approximately triangular. If the blowing pipe 8 is inclined downwards as a whole, but its bottom surface gradually increases in height from the end connected to the blower 7 to the other end, this will also cause the clean water to accumulate. Therefore, in this utility model, the projection of the bottom surface of the blowing pipe 8 in the plane perpendicular to the length direction of the outlet at the bottom of the granular material hopper 1 gradually decreases in height from the end connected to the blower 7 to the other end. This setting can prevent the clean water from accumulating at the blowing pipe 8.

[0044] In traditional fan 7 connections to pipelines, the flanges on the two opposite end faces of the two pipelines are parallel to each other, and the distance between the two flanges is exactly matched to the fan 7, with no extra adjustable clearance. The structure of fan 7 is as follows: Figure 8 As shown, when installing the fan 7, it needs to be accurately aligned before it can be pushed in for installation. However, the fan 7 is very heavy, making the installation process difficult. In this embodiment, a blower flange 81 is provided at the end of the blower duct 8 near the air outlet of the fan 7, and a return air flange 61 is provided at the end of the return air duct 6 near the air inlet of the fan 7. The plane of the blower flange 81 and the plane of the return air flange 61 form an angle θ. Its structure is as follows. Figure 6 As shown, a wedge-shaped assembly 10 is also provided to facilitate the installation of the fan 7, and its structure is as follows: Figure 7 As shown, the wedge-shaped assembly 10 is disposed between the fan 7 and the blowing duct flange 81 or the return air duct flange 61.

[0045] The wedge assembly 10 includes flange plates 101 and wedge-shaped pipes 102. There are two flange plates 101, each disposed at one end of the wedge-shaped pipe 102. The two end faces of the wedge-shaped pipe 102 form an included angle θ. One of the flange plates 101 is bolted to the air inlet or outlet of the fan 7, and the other is bolted to the return air duct flange 61 or the blowing air duct flange 81. In this embodiment, the wedge assembly 10 is disposed between the fan 7 and the blowing air duct flange 81. Therefore, one flange plate 101 is connected to the air outlet of the fan 7, and the other is connected to the blowing air duct flange 81, while the return air duct flange 61 is bolted to the air inlet of the fan 7.

[0046] In this embodiment, the plane where the blower duct flange 81 is located and the plane where the return air duct flange 61 is located have an angle θ. After the wedge assembly 10 is connected to the fan 7, they form a whole. The end face of the fan 7 and the plane where the flange plate 101 is located also have an angle θ. Thus, during installation, the narrowest part of the whole formed by connecting the wedge assembly 10 and the fan 7 is pushed in from the farthest distance between the blower duct flange 81 and the return air duct flange 61, which facilitates the installation of the fan 7.

[0047] The method of using the air-classifying internal air circulation powder material separation device provided in this embodiment is as follows:

[0048] S1. Start the blower 7 and control the degree of separation of powder and granular materials by adjusting the speed of the blower 7;

[0049] S2. Pour the powdered material into the powdered material hopper 1. When the powdered material falls from the outlet at the bottom of the powdered material hopper 1 into the separation chamber 2, because the outlet at the bottom of the powdered material hopper 1 is a narrow slit, the powdered material will fall in the form of a thin curtain. The blower 7 blows air onto it. Because the end of the blower pipe 8 connected to the rear wall of the separation chamber 2 is a narrow slit, a thin air curtain will be formed and blown onto the thin curtain formed by the falling powdered material. At the same time, the suction device connected to the negative pressure suction port 51 starts to suction air, so that the entire device is in a slightly negative pressure state.

[0050] S3. Larger particles in the powder material are less affected by the wind and fall into the particle discharge channel 3 located directly below the outlet at the bottom of the powder material hopper 1.

[0051] Finer powder particles in the granular materials are greatly affected by the wind and are blown to the dust downflow channel 4, and then enter the powder silo.

[0052] The air blown out from the outlet of the blower 7 passes through the blowing duct 8, the separation chamber 2, the dust flushing channel 4, the return air dust chamber 5, and the return air duct 6 back to the inlet of the blower 7, forming an internal circulation. At the same time, dust particles finer than the powder enter the return air dust chamber 5 with the air blown out by the blower 7. Because the cross-sectional area of ​​the return air dust chamber 5 gradually increases from the bottom to the top, the wind speed gradually decreases, and the dust naturally settles into the powder chamber. Cleaner air returns to the inlet of the blower 7 through the return air duct 6.

[0053] S4. Collect the separated granular material through a conveyor or silo located at the granular material outlet, and collect the separated powder and naturally settled dust through a powder silo located at the powder material outlet, thus completing the separation of powder and granular materials by air classification and internal air circulation.

[0054] The embodiments described above are merely descriptions of specific implementations of this utility model and are not intended to limit the scope of this utility model. Various modifications and improvements made to the technical solutions of this utility model by those skilled in the art without departing from the spirit of this utility model should fall within the protection scope defined by the claims of this utility model.

Claims

1. A powder and particle material separation device with air selection and air internal circulation, characterized in that: it comprises a powder and particle material feeding hopper (1), a separation bin body (2), a granular material discharging channel (3), a dust downward flushing channel (4), a return air dust bin (5), a return air pipeline (6), a fan (7) and a blowing pipeline (8); the top of the separation bin body (2) is provided with a feeding port, the powder and particle material feeding hopper (1) is arranged at the feeding port position, the bottom of the powder and particle material feeding hopper (1) is provided with an outlet, and the outlet is in the form of a narrow gap; the bottom of the separation bin body (2) is provided with a granular material separation port and a dust separation port, the granular material separation port is located below the outlet of the powder and particle material feeding hopper (1), the dust separation port is located in front of the granular material separation port, and the granular material discharging channel (3) and the dust downward flushing channel (4) are connected with the granular material separation port and the dust separation port respectively; the bottom of the granular material discharging channel (3) is provided with a granular material discharging port for connecting a conveyor or a bin; the return air dust bin (5) is arranged at the front side of the dust downward flushing channel (4), the bottom of the return air dust bin (5) is provided with a dust collecting inlet, the bottom of the dust downward flushing channel (4) is provided with a powder discharging port, the dust collecting inlet and the powder discharging port are in communication, the powder discharging port is used for being connected with a powder bin, the cross-sectional area of the return air dust bin (5) gradually increases from the bottom to the top, and the cross-sectional area of the blowing pipeline (8) gradually decreases from one end to the other end; the outlet of the fan (7) is connected with one end of the blowing pipeline (8), the other end is located between the outlet of the powder and particle material feeding hopper (1) and the granular material separation port, and is connected to the rear side wall of the separation bin body (2); the end of the blowing pipeline (8) connected to the rear side wall of the separation bin body (2) is in the form of a narrow gap, and the length direction of the blowing pipeline (8) is parallel to the length direction of the outlet of the powder and particle material feeding hopper (1); the inlet of the fan (7) is connected with one end of the return air pipeline (6), the other end of the return air pipeline (6) is in communication with the upper part of the return air dust bin (5); the outer wall of the upper part of the return air dust bin (5) is provided with a negative pressure air suction port (51), the negative pressure air suction port (51) is in communication with the return air dust bin (5), and the negative pressure air suction port (51) is used for connecting an air suction device.

2. The powder and particle material separation device with air selection and air internal circulation according to claim 1, characterized in that: one end of the blowing pipeline (8) is circular and connected with the outlet of the fan (7), the shape of the blowing pipeline (8) gradually changes from circular to narrow gap from one end to the other end, and the cross-sectional area of the blowing pipeline (8) gradually decreases.

3. The powder and particle material separation device with air selection and air internal circulation according to claim 2, characterized in that: the return air pipeline (6), the fan (7) and the blowing pipeline (8) constitute an internal circulation pipeline, the height of the entire internal circulation pipeline gradually decreases from one end of the return air pipeline (6) in communication with the return air dust bin (5) to the end of the blowing pipeline (8) connected with the rear side wall of the separation bin body (2), and the projection of the bottom surface of the blowing pipeline (8) in the plane perpendicular to the length direction of the outlet of the powder and particle material feeding hopper (1) gradually decreases from one end connected with the fan (7) to the other end. ​ ​ ​ ​ ​ ​ ​ ​ The top of the return air static dust bin (5) is provided with an opening and closing cover plate (9).

4. The wind selection and air circulation powder particle material separation device according to claim 3, characterized in that: The blowing pipe (8) is provided with a blowing pipe flange (81) at one end close to the air outlet of the fan (7), the return air pipe (6) is provided with a return air pipe flange (61) at one end close to the air inlet of the fan (7), and the plane where the blowing pipe flange (81) is located and the plane where the return air pipe flange (61) is located have an included angle θ; A wedge-shaped component (10) is arranged between the fan (7) and the blowing pipe flange (81) or the return air pipe flange (61), including a flange plate (101) and a wedge-shaped pipe (102), the flange plate (101) has two and is arranged at both ends of the wedge-shaped pipe (102), the two end faces of the wedge-shaped pipe (102) have an included angle θ, one of the two flange plates (101) is connected with the air inlet or air outlet of the fan (7), and the other is connected with the return air pipe flange (61) or the blowing pipe flange (81).

5. The wind selection and air circulation powder particle material separation device according to claim 1, characterized in that: The fan (7) is a variable speed fan.

6. The wind selection and air circulation powder particle material separation device according to claim 4, characterized in that: One of the two flange plates (101) is connected with the air inlet or air outlet of the fan (7) through bolts, and the other flange plate (101) is connected with the return air pipe flange (61) or the blowing pipe flange (81) through bolts.

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