A powder and granular material air separation device with one unit open and one unit on standby

Abstract

This utility model specifically relates to a one-on-one standby air separation device for powder and granular materials. It solves the problems of existing air separation devices where the machine can only be shut down for repair or replacement after the fan fails, affecting production efficiency, and the high energy consumption and environmental pressure caused by using fresh air for air separation. This utility model can realize production switching through a feeding conversion component. The two separation chambers are guaranteed to be one in operation and one in standby. When one fails, the feeding conversion component can switch to the other in time to quickly restore production. The fan blows air to separate the granular material from the powder. The granular material falls into the granular material discharge channel, and the powder falls into the powder hopper after passing through the dust flushing channel. The air entering the return air dust hopper from the dust flushing channel is slowed down due to the increased cross-sectional area. The dust carried into the return air dust hopper naturally settles into the powder hopper, and the cleaner air enters the return air duct to achieve recycling.

Description

Technical Field

[0001] This utility model relates to an air separation device, specifically to an air separation device for powder and granular materials that can be operated in one standby mode. Background Technology

[0002] In the production of granular materials such as urea, granules and powders often coexist. During the final packaging stage, they need to be separated for separate packaging and storage. Air separation devices are commonly used to achieve this separation. Existing air separation devices work by utilizing the different degrees to which granules and powders are affected by wind. By blowing air, the granules and powders fall to different locations, thus separating them for separate collection. However, existing air separation devices have the following problems in use:

[0003] 1) The power source of the existing air separation device is a fan. The fan needs to run continuously during the air separation process. If the fan fails, the entire air separation process cannot continue and the machine must be shut down for repair or replacement, which affects production efficiency.

[0004] 2) Existing air separation devices mostly use 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. Utility Model Content

[0005] The purpose of this invention is to solve the technical problems of existing air separation devices that can only be shut down for maintenance or replacement after the fan fails, which affects production efficiency, and the high energy consumption and environmental pressure caused by using fresh air for air separation. The invention provides an air separation device for powder and granular materials that can be operated in one standby mode.

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

[0007] A powder and granular material air separation device with one standby operation, characterized by the following features:

[0008] Includes the feeding hopper, feeding conversion assembly, air separation hopper, blower, air blowing duct, and return air duct;

[0009] The feeding hopper is located on top of the air separation hopper. The top of the feeding hopper has a powder material inlet, and the bottom has a powder material outlet.

[0010] The air separation chamber includes a separation chamber, a granular material discharge channel, a dust flushing channel, and a return air dust chamber. There are two separation chambers and two dust flushing channels. There is one return air dust chamber and one granular material discharge channel. The two separation chambers are arranged side by side. The two separation inlets at the top of the two separation chambers are set to correspond to the powder material discharge outlets.

[0011] The feeding conversion component is installed on the feeding bin and is used to guide the powder material entering from the powder material inlet to one of the separation inlets;

[0012] Both separation chambers are equipped with powder separation port and granular material separation port at the bottom, respectively. The granular material separation port is located below the powder and granular material discharge port, and the powder separation port is located in front of the corresponding granular material separation port.

[0013] The granular material discharge channel is connected to two granular material separation ports, and its bottom is provided with a granular material discharge port for connecting to a conveyor or silo; the two dust flushing channels are respectively connected to two powder separation ports, and their bottoms are provided with powder discharge ports.

[0014] The return air dust chamber is located in front of the two separation chambers. A dust collection inlet is provided at the bottom of the return air dust chamber. The cross-sectional area of ​​the return air dust chamber gradually increases from the bottom to the top. The dust collection inlet is connected to two powder outlets, which are used to connect to the powder chamber.

[0015] There are two fans. The air outlet of each fan is connected to one end of the blowing pipe. The other end of the blowing pipe is located between the separation feed inlet and the granular material separation outlet and is connected to the rear side wall of the corresponding separation chamber. The air inlet of each fan 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 chamber.

[0016] Furthermore, the feeding conversion assembly includes a slide, a side plate, a central shaft, a connecting plate, and a cylinder;

[0017] The chute is located directly below the feed inlet of the powder material. There are two side plates, which are respectively arranged on both sides of the chute. The central shaft is fixedly connected to the middle of the chute. One end of the central shaft passes through the side wall of the feeding hopper and is fixedly connected to one end of the connecting plate. The fixed end of the cylinder is hinged to the top side wall of the separation hopper, and the movable end is hinged to the other end of the connecting plate.

[0018] Furthermore, it also includes two discharge port adjustment components, which are respectively set at the separation inlet positions of the two separation chambers;

[0019] Each discharge port adjustment assembly includes a discharge port hopper and two adjustment units. Each adjustment unit includes a baffle plate, a rotating shaft, a sector toothed plate, and a mounting flange.

[0020] The feed hopper is connected to the powder material outlet, and the rotating shafts of the two adjusting units are respectively located on both sides of the bottom outlet of the feed hopper.

[0021] The axis of the rotating shaft is set along the length of the bottom outlet of the feed hopper. The baffle is set on the outer wall of the rotating shaft, and the two baffles can abut against each other through the rotation of the rotating shaft to block the bottom outlet of the feed hopper.

[0022] The separation chamber has mounting holes on its side wall. The mounting flange is set corresponding to the mounting holes and installed on the outer side wall of the separation chamber. One end of the rotating shaft extends out of the separation chamber and is rotatably connected to the mounting flange. The sector toothed plate is connected to the end of the rotating shaft that extends out of the separation chamber, and the two sector toothed plates mesh with each other.

[0023] A handle is provided on the outer wall of at least one of the two sector toothed plates. The handle is used to rotate the sector toothed plate and thereby adjust the size of the bottom outlet of the feed hopper.

[0024] Furthermore, a negative pressure exhaust port is provided on the outer wall of the upper part of the return air dust chamber, and the negative pressure exhaust port is used to connect an exhaust device.

[0025] The return air dust chamber is equipped with a rib plate inside, which divides the return air dust chamber into two sub-return air dust chambers. The two sub-return air dust chambers are respectively located on the front side of the two separation chambers.

[0026] A notch is provided above the rib plate to connect the upper parts of the two sub-return air dust chambers, and dust collection inlets are provided on the lower sides of the two sub-return air dust chambers respectively.

[0027] Two switch covers are installed on the top outer wall of each of the two sub-return air and dust chambers.

[0028] Furthermore, the cross-sectional area of ​​the dust downflow channel gradually decreases from top to bottom, and the two dust downflow channels converge towards the middle.

[0029] Furthermore, the bottom outlet of the feed hopper is a narrow slit;

[0030] The end of the blower duct connected to the air outlet of the blower is circular, and 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.

[0031] The length of the narrow slit end of the air duct is parallel to the length of the bottom outlet of the feed hopper.

[0032] 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 bottom outlet of the feed hopper gradually decreases from the end connected to the fan to the other end.

[0033] 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.

[0034] A wedge assembly is provided between the fan and the flange of the blowing duct or the return air duct. The assembly includes a flange plate and a wedge-shaped pipe. There are two flange plates, which are respectively located 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 flange of the return air duct or the flange of the blowing duct.

[0035] Furthermore, the lower ends of the two powder discharge ports are connected to the same discharge port, the dust collection inlet is located above the discharge port, and the discharge port is used to connect to the powder silo.

[0036] Compared with the prior art, the beneficial effects of this utility model are:

[0037] (1) The present invention provides an open-standby-standby air separation device, which, through a feeding conversion component, can guide the powder material entering from the powder material inlet to the separation inlet of one of the separation chambers. This ensures that one separation chamber is open and the other is standby. When one fan fails, it can be switched to the other in a timely manner to quickly restore production. During air separation, the air blown by the fan separates the granular material from the powder material, and the dust adhering to the granular material is also blown away. The separated granular material falls into the granular material discharge channel and enters the next process, while the separated powder material... After the separated powder passes through the dust flushing channel, it falls into the powder silo. At this time, finer dust follows the wind into the return air dust silo. Because the cross-sectional area of ​​the return air dust silo gradually increases from the bottom to the top, the wind speed slows down. The dust carried into the return air dust silo by the wind naturally settles into the powder silo below due to the reduced speed, while 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 realizes the recycling of air, which reduces energy consumption and environmental pollution.

[0038] (2) In the dust-flush channel of the present invention, the cross-sectional area gradually decreases from top to bottom, which increases the airflow speed and makes the powder rush into the powder bin faster.

[0039] (3) The feed port adjustment component of the powder and granular material air separation device provided by this utility model can adjust the distance between the two baffles by rotating the fan-shaped toothed plate, so as to adjust the thickness of the thin curtain formed when the powder and granular material falls and the feeding speed. The two fan-shaped toothed plates mesh with each other and are linked together, making the adjustment more convenient.

[0040] (4) The powder and granular material air separation device provided by this utility model is equipped with a switch cover plate, which is convenient for observing the internal situation and cleaning. The return air dust chamber is divided into two sub-return air dust chambers by the rib plate. There is a notch on the upper part of the rib plate so that the upper part of the two sub-return air dust chambers can be connected. In this way, the two sub-return air dust chambers can share a negative pressure exhaust port. The exhaust device connected to the negative pressure exhaust port makes the entire device internally form a slight negative pressure, which prevents dust from escaping from the powder and granular material inlet and the granular material outlet. This can more effectively prevent dust pollution of the environment. The rib plate also acts as a reinforcing rib plate, which improves the strength of the device.

[0041] (5) The present invention provides a one-on-one standby air separation device for powder and granular materials, wherein the return air pipe, the blower, and the blowing pipe constitute an internal circulation pipeline. The height of the entire internal circulation pipeline gradually decreases from the end where the return air pipe connects to the return air dust chamber to the end where the blowing pipe connects to the rear side wall of the separation chamber. Because dust will adhere to the inner wall of the internal circulation pipeline after a period of use, it is necessary to clean it regularly 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 plate. Because the internal circulation pipeline has a height difference, the cleaning water flows into the granular material discharge channel along the internal circulation pipeline. Finally, 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 feed 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 invention, the projection of the bottom surface of the blowing pipe in the plane perpendicular to the length direction of the outlet of the feed hopper gradually decreases in height from the end connected to the blower to the other end. This setting can prevent cleaning water from accumulating in the blowing pipe.

[0042] (6) The powder and granular material air separation device provided by this utility model is also equipped with a wedge component. Because in the traditional connection between the blower and the pipeline, 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 just compatible with the blower. There is no extra adjustable gap. When installing the blower, it is necessary to accurately align the position before pushing it in for installation. However, the blower is very heavy, which makes the installation process very difficult. In this utility model, the plane where the blower duct flange is located and the plane where the return air duct flange is located have an angle θ. After the wedge component is connected to the blower, it forms a whole. The end face of the blower and the plane where the flange plate is located also have an angle θ. In this way, during installation, the narrowest part of the whole formed by the connection of the wedge component and the blower is pushed in from the farthest distance between the blower duct flange and the return air duct flange, which facilitates the installation of the blower.

[0043] (7) In the powder and granular material air separation device provided by this utility model, the bottom outlet of the feed hopper is slit-shaped, and the end of the air pipe connected to the rear side wall of the separation chamber is also slit-shaped. The length direction of the slit end of the air pipe is parallel to the length direction of the bottom outlet of the feed hopper. In this way, when the powder and granular material falls from the bottom outlet of the feed hopper, a thin curtain will be formed, and the air blown out from the air pipe will also form a thin air curtain. The contact area between the two is increased, and the air separation efficiency is improved. Attached Figure Description

[0044] Figure 1 This is a three-dimensional structural diagram of an embodiment of the powder and granular material air separation device of this utility model, which has one open and one standby configuration. Figure 1 ;

[0045] Figure 2 This is a three-dimensional structural diagram of an embodiment of the present utility model. Figure 2 ;

[0046] Figure 3 This is a schematic diagram showing the location and structure of the separation chamber, the granular material discharge channel, the dust flushing channel, the return air and dust silo, and the return air duct in an embodiment of this utility model.

[0047] Figure 4 This is a side view of an embodiment of the present utility model;

[0048] Figure 5 for Figure 4 Sectional view along axis AA;

[0049] Figure 6 This is a top view of an embodiment of the present utility model;

[0050] Figure 7 for Figure 6 BB-direction sectional view;

[0051] Figure 8 for Figure 4 CC-direction sectional view;

[0052] Figure 9 This is a schematic diagram of the structure of the feed inlet adjustment component in an embodiment of this utility model;

[0053] Figure 10 This is a schematic diagram of the structure of the adjustment unit in an embodiment of the present invention;

[0054] Figure 11 This is a schematic diagram of the feeding conversion component in an embodiment of the present invention (cylinder not shown);

[0055] Figure 12 This is a schematic diagram of the installation of the return air duct flange and the blowing air duct flange in an embodiment of this utility model (the material unloading hopper is not shown);

[0056] Figure 13 This is a three-dimensional structural diagram of the air blowing pipe in an embodiment of this utility model;

[0057] Figure 14 This is a three-dimensional structural diagram of the wedge-shaped component in an embodiment of the present invention.

[0058] The annotations in the attached figures are explained as follows:

[0059] 1-Feeding bin body, 2-Feeding conversion assembly, 21-Slide, 22-Side plate, 23-Central shaft, 24-Connecting plate,

[0060] 25-Cylinder; 3-Feeding port adjustment component; 31-Feeding port hopper; 32-Baffle plate; 33-Rotating shaft; 34-Fan-shaped toothed plate; 35-Mounting flange; 36-Handle; 4-Particle material discharge channel; 5-Dust flushing channel; 6-Return air dust chamber; 61-Switch cover plate; 62-Negative pressure exhaust port; 7-Fan; 8-Blowing duct; 81-Blowing duct flange; 9-Return air duct; 91-Return air duct flange; 10-Separation chamber; 11-Wedge component; 111-Flange plate; 112-Wedge pipe; 12-Discharge port. Detailed Implementation

[0061] The present invention will be further described below with reference to the accompanying drawings and exemplary embodiments.

[0062] Reference Figures 1-14 The present invention provides a powder and granular material air separation device with one open and one standby, comprising a feeding bin 1, a feeding conversion component 2, a feeding port adjustment component 3, an air separation bin, a blower 7, a blowing pipe 8, and a return air pipe 9.

[0063] The feeding hopper 1 is located at the top of the air separation chamber. A powder / granular material inlet is located at the top of the feeding hopper 1, and a powder / granular material outlet is located at the bottom. The structure of the air separation chamber is as follows: Figure 3 As shown, it includes a separation chamber 10, a granular material discharge channel 4, a dust flushing channel 5, and a return air and dust silo 6.

[0064] like Figure 3As shown, there are two separation chambers 10 and two dust flushing channels 5, one return air dust chamber 6 and one granular material discharge channel 4. The two separation chambers 10 are arranged side by side, and the two separation inlets at the top of the two separation chambers 10 correspond to the powder and granular material discharge outlets. Each of the two separation chambers 10 has a powder separation port and a granular material separation port at the bottom. The granular material separation port is located below the powder and granular material discharge outlet and in front of the corresponding granular material separation port. The granular material discharge channel 4 is connected to the two granular material separation ports, and its bottom has a granular material discharge outlet for connecting to a conveyor or silo. This arrangement of the powder and granular material separation ports is because the granular material in the powder and granular materials is less affected by wind, and its falling trajectory in the separation chamber 10 is close to a straight line. Therefore, the granular material separation port is located below the corresponding powder and granular material discharge outlet. The powder material is more affected by wind, and its falling trajectory is close to a parabola, and its landing point is farther than that of the granular material. Therefore, the powder separation port is located in front of the corresponding granular material separation port.

[0065] The feeding conversion assembly 2 is installed on the feeding bin 1 and is used to guide the powder material entering from the powder material inlet to one of the separation inlets. The structure of the feeding conversion assembly 2 is as follows: Figure 11 As shown, the system includes a chute 21, side plates 22, a central shaft 23, a connecting plate 24, and a cylinder 25. The chute 21 is located directly below the feed inlet of the powder material. There are two side plates 22, which are respectively set on both sides of the chute 21 to prevent the material from sliding out from both sides of the chute 21. The central shaft 23 is fixedly connected to the middle of the chute 21. One end of the central shaft 23 passes through the side wall of the feeding hopper 1 and is fixedly connected to one end of the connecting plate 24. The fixed end of the cylinder 25 is hinged to the top side wall of the separation chamber 10 in the air separation chamber, and the movable end is hinged to the other end of the connecting plate 24. In this way, the movable end of the cylinder 25 drives the connecting plate 24, the central shaft 23, and the chute 21 to rotate by a certain angle in sequence, so that the powder material entering from the feed inlet can be guided to one of the separation feed inlets. The structure is simple and the operation is convenient.

[0066] Two dust flushing channels 5 are respectively connected to two powder separation ports, and powder outlets are provided at their bottoms, and as shown... Figure 8As shown, the cross-sectional area of ​​the dust downflow channel 5 gradually decreases from top to bottom, and the two dust downflow channels 5 converge towards the center. This accelerates the downward flow of powder, allowing the powder to enter the powder silo more quickly. The return air dust silo 6 is located in front of the two separation chambers 10. The bottom of the return air dust silo 6 has a dust collection inlet, and the cross-sectional area of ​​the return air dust silo 6 gradually increases from bottom to top. The dust collection inlet is connected to the two powder outlets, which are used to connect to the powder silo. To improve the structural strength of the entire device, a rib is provided inside the return air dust chamber 6, which divides the return air dust chamber 6 into two sub-return air dust chambers. The two sub-return air dust chambers are respectively located on the front side of the two separation chambers 10. A notch is provided above the rib to connect the upper parts of the two sub-return air dust chambers. Dust collection inlets are respectively provided on the lower side of the two sub-return air dust chambers. The lower ends of the two powder outlets are connected to the same discharge port 12. The dust collection inlet is located above the discharge port 12. The discharge port 12 is used to connect the powder silo, simplifying the connection between the powder silo and the powder outlet.

[0067] A negative pressure exhaust port 62 is provided on the outer wall of the upper part of the return air dust collection chamber 6. The negative pressure exhaust port 62 is used to connect to the exhaust device. The two sub-return air dust collection chambers can share a single negative pressure exhaust port 62 through the notch on the rib, which is simple in structure. Through the exhaust device connected to the negative pressure exhaust port 62, the entire device is kept in a slightly negative pressure state during the air separation process, which prevents dust from escaping from the powder material inlet and the granular material outlet, thus protecting the external environment.

[0068] Two discharge port adjustment components 3 are respectively installed at the separation inlet positions of the two separation chambers 10, and their structures are as follows: Figure 9 As shown, it includes a feed hopper 31 and two adjusting units, the structure of which is as follows: Figure 10As shown, it includes a baffle plate 32, a rotating shaft 33, a fan-shaped toothed plate 34, and a mounting flange 35. The discharge hopper 31 is connected to the powder material outlet, and the bottom outlet of the discharge hopper 31 is a narrow slit. In this way, the powder material falling from the discharge hopper 31 will fall in the form of a thin curtain, which is convenient for air separation. The rotating shafts 33 of the two adjustment units are respectively located on both sides of the bottom outlet of the feed hopper 31. The axis of the rotating shaft 33 is set along the length of the bottom outlet of the feed hopper 31. The baffle plate 32 is set on the outer wall of the rotating shaft 33, and the two baffle plates 32 can abut against each other through the rotation of the rotating shaft 33 to block the bottom outlet of the feed hopper 31. The side wall of the separation chamber 10 is provided with mounting holes. The mounting flange 35 is set corresponding to the mounting holes and installed on the outer side wall of the separation chamber 10. One end of the rotating shaft 33 extends out of the separation chamber 10 and is rotatably connected to the mounting flange 35. The fan-shaped toothed plate 34 is connected to the end of the rotating shaft 33 that extends out of the separation chamber 10, and the two fan-shaped toothed plates 34 mesh with each other. The distance between the two baffle plates 32 is adjusted by rotating the fan-shaped toothed plate 34 to adjust the thickness of the thin curtain formed when the powder material falls and the feeding speed. The two fan-shaped toothed plates 34 mesh with each other and are linked together, making the adjustment more convenient. A handle 36 is provided on the outer wall of at least one of the two sector toothed plates 34. The handle 36 is used to rotate the sector toothed plate 34 and thereby adjust the size of the bottom outlet of the feed hopper 31.

[0069] To achieve a "one-on-one standby" configuration, two blowers 7 are installed. The outlet of each blower 7 is connected to one end of the blowing duct 8, and the other end of the blowing duct 8 is located between the separation feed inlet and the granular material separation outlet, and is connected to the rear side wall of the corresponding separation chamber 10. The inlet of each blower 7 is connected to one end of the return air duct 9, and the other end of the return air duct 9 is connected to the upper part of the return air dust chamber 6. The end of the blowing duct 8 connected to the outlet of the blower 7 is circular. The shape of the blowing duct 8 gradually changes from circular to narrow slit from one end to the other, and the cross-sectional area of ​​the blowing duct 8 gradually decreases. The length direction of the narrow slit end of the blowing duct 8 is parallel to the length direction of the bottom outlet of the feed hopper 31. The shape of the blowing duct 8 is designed in this way to increase the wind speed and wind pressure. The air blown out from the blowing duct 8 is a thin air curtain, which increases the contact area with the thin curtain formed by the falling powder and granular materials, thereby improving the air separation efficiency.

[0070] The return air duct 9, the fan 7, and the blowing duct 8 constitute the internal circulation pipeline. After a period of use, dust will accumulate on the inner wall of the internal circulation pipeline, which needs to be cleaned regularly. Generally, cleaning requires the introduction of high-pressure steam or water into the internal circulation pipeline. Therefore, two switch covers 61 are respectively installed on the top outer wall of the two sub-return air dust chambers. Internal maintenance and cleaning can be carried out through the switch covers 61. To facilitate the flow of cleaning water, the height of the entire internal circulation pipeline gradually decreases from the end where the return air duct 9 connects to the return air dust chamber 6 to the end where the blowing duct 8 connects to the rear wall of the separation chamber 10. Due to the height difference, the cleaning water flows into the pellet discharge channel 4 along the internal circulation pipeline and is finally discharged from the pellet discharge port. Because the shape of the blowing duct 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 of the feed hopper 31 is approximately triangular. If the blowing duct 8 is inclined downwards, but its bottom surface gradually increases in height from the end connected to the fan 7 to the other end, this would also cause cleaning water to accumulate. Therefore, in this embodiment, the projection of the bottom surface of the blowing duct 8 in the plane perpendicular to the length direction of the outlet of the feed hopper gradually decreases in height from the end connected to the fan 7 to the other end. This setting can prevent cleaning water from accumulating in the blowing duct 8.

[0071] In traditional fan 7 connections to ducts, the flanges on the two opposite ends of the two ducts are parallel to each other, and the distance between the two flanges is exactly matched to the fan 7, with no extra adjustable gap. When installing the fan 7, accurate alignment is required before it can be pushed in, and the fan 7 is heavy, making the installation process difficult. In this embodiment, a blower duct flange 81 is provided at the end of the blower duct 8 near the air outlet of the fan 7, and a return air duct flange 91 is provided at the end of the return air duct 9 near the air inlet of the fan 7. The plane of the blower duct flange 81 and the plane of the return air duct flange 91 form an angle θ. A wedge assembly 11 is provided between the fan 7 and the blower duct flange 81 or the return air duct flange 91. The wedge assembly 11 includes flange plates 111 and wedge-shaped pipes 112. There are two flange plates 111, respectively located at both ends of the wedge-shaped pipes 112. The two ends of the duct 112 have an included angle θ. One of the two flange plates 111 is connected to the air inlet or outlet of the fan 7, and the other is connected to the return air duct flange 91 or the blowing air duct flange 81. The wedge-shaped assembly 11 and the fan 7 are connected to form a whole. The end face of the fan 7 and the plane where the flange plate 111 is located also have an included angle θ. Thus, during installation, the narrowest part of the whole formed by the wedge-shaped assembly 11 and the fan 7 is pushed in from the furthest distance between the blowing air duct flange 81 and the return air duct flange 91, which facilitates the installation of the fan 7. In this embodiment, the wedge-shaped assembly 11 is placed between the fan 7 and the blowing air duct flange 81. One of the two flange plates 111 is connected to the air outlet of the fan 7, and the other is connected to the blowing air duct flange 81. The air inlet of the fan 7 is connected to the return air duct flange 91.

[0072] In use, the powdered material is poured into the powdered material inlet of the feeding hopper 1. The cylinder 25 of the feeding conversion component 2 sequentially drives the connecting plate 24, the central shaft 23, and the slide 21 to rotate at a certain angle, guiding the powdered material to the separation inlet of one of the separation chambers 10. At this time, the powdered material falls into the feeding hopper 31 of the feeding port adjustment component 3. When the powdered material falls from the bottom outlet of the feeding hopper 31, it forms a thin curtain because the bottom outlet is a narrow slit. The thickness of the thin curtain is adjusted by adjusting the distance between the two baffle plates 32. When the powdered material falls in the form of a thin curtain in the separation chamber 10, the air blown out by the blower 7 forms a thin air curtain due to the shape of the air blowing pipe 8. The thin air curtain blows onto the thin curtain formed by the powdered material, completing the air separation. At this time, the particles in the powdered material are less affected by the thin air curtain and fall into the particle discharge channel. 4. The separated powder is collected by the conveyor or silo and falls into the powder silo through the dust flushing channel 5. The finer dust particles will follow the wind into the return air dust silo 6. Because the cross-sectional area of ​​the return air dust silo 6 gradually increases from bottom to top, the wind speed slows down. The dust carried into the return air dust silo 6 by the wind naturally settles into the powder silo below due to the reduced speed. The cleaner air enters the return air duct, forming an internal circulation of "air outlet - air blowing duct 8 - separation silo 10 - dust flushing channel 5 - return air dust silo 6 - return air duct 9 - air inlet". This realizes the recycling of air and reduces energy consumption. At the same time as the air separation, the air is drawn by the air extraction device connected to the negative pressure air extraction port 62, so that the entire device forms a slight negative pressure, preventing dust from escaping from the powder material inlet and the granular material outlet, thus preventing dust pollution of the environment.

[0073] 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 / granular material air separation device with one standby operation, characterized in that: It includes a feeding hopper (1), a feeding conversion assembly (2), an air separation hopper, a blower (7), an air blowing duct (8), and a return air duct (9); The feeding bin (1) is located on top of the air separation bin. The top of the feeding bin (1) is provided with a powder material inlet and the bottom is provided with a powder material outlet. The air separation chamber includes a separation chamber (10), a granular material discharge channel (4), a dust downflow channel (5), and a return air dust chamber (6); there are two separation chambers (10) and two dust downflow channels (5), and one return air dust chamber (6) and one granular material discharge channel (4). The two separation chambers (10) are arranged side by side, and the two separation inlets at the top of the two separation chambers (10) are set to correspond to the powder material discharge outlets. The feeding conversion component (2) is installed on the feeding bin (1) and is used to guide the powder material entering from the powder material inlet to one of the separation inlets; The bottom of each of the two separation chambers (10) is provided with a powder separation port and a granular material separation port respectively. The granular material separation port is located below the powder and granular material outlet, and the powder separation port is located in front of the corresponding granular material separation port. The granular material discharge channel (4) is connected to two granular material separation ports, and a granular material discharge port is provided at its bottom for connecting to a conveyor or silo; the two dust flushing channels (5) are respectively connected to two powder separation ports, and a powder discharge port is provided at their bottom. The return air dust chamber (6) is located in front of the two separation chambers (10). The bottom of the return air dust chamber (6) is provided with a dust collection inlet. The cross-sectional area of ​​the return air dust chamber (6) gradually increases from the bottom to the top. The dust collection inlet is connected to two powder outlets. The two powder outlets are used to connect to the powder chamber. Two fans (7) are provided. The air outlet of each fan (7) is connected to one end of the blowing pipe (8). The other end of the blowing pipe (8) is located between the separation feed inlet and the granular material separation inlet and is connected to the rear side wall of the corresponding separation chamber (10). The air inlet of each fan (7) is connected to one end of the return air pipe (9). The other end of the return air pipe (9) is connected to the upper part of the return air dust chamber (6).

2. The powder and granular material air separation device with one standby unit as described in claim 1, characterized in that: The feeding conversion assembly (2) includes a slide (21), a side plate (22), a central shaft (23), a connecting plate (24), and a cylinder (25); The chute (21) is located directly below the feed inlet of the powder material. There are two side plates (22) respectively located on both sides of the chute (21). The central shaft (23) is fixedly connected to the middle of the chute (21). One end of the central shaft (23) passes through the side wall of the feeding hopper (1) and is fixedly connected to one end of the connecting plate (24). The fixed end of the cylinder (25) is hinged to the top side wall of the separation hopper (10), and the movable end is hinged to the other end of the connecting plate (24).

3. The powder and granular material air separation device with one standby unit as described in claim 2, characterized in that: It also includes two feed inlet adjustment components (3), which are respectively set at the separation feed inlet positions of the two separation chambers (10); Each discharge port adjustment assembly (3) includes a discharge port hopper (31) and two adjustment units. Each adjustment unit includes a baffle plate (32), a rotating shaft (33), a fan-shaped toothed plate (34), and a mounting flange (35). The feed hopper (31) is connected to the powder material outlet, and the rotating shafts (33) of the two adjustment units are respectively located on both sides of the bottom outlet of the feed hopper (31); The axis of the rotating shaft (33) is set along the length direction of the bottom outlet of the feed hopper (31). The baffle plate (32) is set on the outer wall of the rotating shaft (33), and the two baffle plates (32) can abut against each other through the rotation of the rotating shaft (33) to block the bottom outlet of the feed hopper (31). The separation chamber (10) has mounting holes on its side wall. The mounting flange (35) is provided corresponding to the mounting holes and is installed on the outer side wall of the separation chamber (10). One end of the rotating shaft (33) extends out of the separation chamber (10) and is rotatably connected to the mounting flange (35). The fan-shaped toothed plate (34) is connected to the end of the rotating shaft (33) that extends out of the separation chamber (10), and the two fan-shaped toothed plates (34) mesh with each other. A handle (36) is provided on the outer wall of at least one of the two fan-shaped toothed plates (34), the handle (36) being used to rotate the fan-shaped toothed plate (34) and thereby adjust the size of the bottom outlet of the feed hopper (31).

4. The powder and granular material air separation device with one standby unit as described in claim 3, characterized in that: The upper outer wall of the return air dust chamber (6) is provided with a negative pressure exhaust port (62), which is used to connect an exhaust device. The return air dust chamber (6) is provided with a rib plate inside, which divides the return air dust chamber (6) into two sub-return air dust chambers. The two sub-return air dust chambers are respectively arranged on the front side of the two separation chambers (10). A notch is provided above the rib plate to connect the upper parts of the two sub-return air dust chambers, and dust collection inlets are provided on the lower sides of the two sub-return air dust chambers respectively. Two switch covers (61) are respectively installed on the top outer wall of the two sub-return air dust chambers.

5. The powder and granular material air separation device according to claim 1, characterized in that: The cross-sectional area of ​​the dust downflow channel (5) gradually decreases from top to bottom, and the two dust downflow channels (5) converge towards the middle.

6. The powder and granular material air separation device with one standby operation according to claim 4, characterized in that: The bottom outlet of the feed hopper (31) is a narrow slit; The end of the blower pipe (8) connected to the air outlet of the fan (7) is circular. The shape of the blower pipe (8) gradually changes from circular to narrow slit from one end to the other, and the cross-sectional area of ​​the blower pipe (8) gradually decreases. The length direction of one narrow slit end of the air blowing pipe (8) is parallel to the length direction of the bottom outlet of the feed hopper (31).

7. The powder and granular material air separation device with one standby unit as described in claim 6, characterized in that: The return air duct (9), the fan (7), and the blowing duct (8) constitute an internal circulation pipeline. The height of the entire internal circulation pipeline gradually decreases from the end where the return air duct (9) is connected to the return air dust chamber (6) to the end where the blowing duct (8) is connected to the rear side wall of the separation chamber (10). The projection of the bottom surface of the blowing duct (8) in the plane perpendicular to the length direction of the bottom outlet of the feed hopper (31) gradually decreases from the end connected to the fan (7) to the other end.

8. The powder and granular material air separation device according to claim 7, characterized in that: The blower duct (8) is provided with a blower duct flange (81) at one end near the air outlet of the fan (7), and the return air duct (9) is provided with a return air duct flange (91) at one end near the air inlet of the fan (7). The plane where the blower duct flange (81) is located and the plane where the return air duct flange (91) is located have an angle θ. A wedge assembly (11) is provided between the fan (7) and the blower duct flange (81) or the return air duct flange (91), comprising a flange plate (111) and a wedge duct (112). There are two flange plates (111), which are respectively provided at both ends of the wedge duct (112). The two end faces of the wedge duct (112) have an included angle of θ. One of the two flange plates (111) is connected to the air inlet or air outlet of the fan (7), and the other is connected to the return air duct flange (91) or the blower duct flange (81).

9. The air separation device for powder and granular materials with one standby operation as described in claim 1, characterized in that: The lower ends of the two powder discharge ports are connected to the same discharge port (12), the dust collection inlet is located above the discharge port (12), and the discharge port (12) is used to connect to the powder silo.

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