Double-layer rotor scale

Abstract

The utility model discloses a double-layer rotor scale which comprises a scale body, the interior of the scale body is of a cavity structure and is provided with a bin partition plate, the bin partition plate divides the scale body into an upper cylinder and a lower cylinder in the vertical direction, the bin partition plate is provided with a communicating hole for communicating the upper cylinder and the lower cylinder, and the communicating hole is of a fan-shaped structure concentric with the bin partition plate. And at least two separation strips are uniformly arranged in the opening area of the communication hole and are arranged in the radius direction of the communication hole of the fan-shaped structure. According to the utility model, the separation strips are arranged on the communication holes, so that powder cannot be stacked in a single area like a single communication hole structure in the process of reaching the lower barrel from the upper barrel to the lower barrel from the communication holes, and can be stacked in each area separated by the communication holes under the action of the separation strips; the height of the highest point of the powder stacked in the lower barrel in the partitioned mode can be reduced, the risk that the powder intrudes into the upper barrel is reduced, and then the accuracy of the powder metering and conveying process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of powder transportation equipment, in particular to a double-layer rotor scale. Background Art

[0002] At present, rotor scales are generally used for measuring powder materials in the market. In order to solve the problem of material impact during powder feeding, rotor scales are designed with a double-layer structure. For double-layer rotor scales, the space inside the scale body is often divided into upper and lower silos in the vertical direction by a partition structure. At the same time, through holes are opened on the partition to connect the two silos. The two silos are respectively provided with rotors to drive the powder to move in the silos. The through holes are staggered with the feed and discharge ports to reduce the risk of material impact. However, when the powder enters the lower silo through the through holes, if the filling rate of the upper silo is large and there is a lot of accumulated material, the material passing through the through holes will accumulate at a certain angle in the lower silo, and will continue to remain in the upper silo when the rotor passes through. This will cause repeated measurement of the material and affect the accuracy of powder measurement and transportation.

[0003] Therefore, how to improve the accuracy of the powder measurement and conveying process in the double-layer rotor scale is a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide a double-layer rotor scale with higher accuracy in the measurement and transportation process of powder materials.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A double-layer rotor scale includes a scale body, the interior of the scale body is a cavity structure and is provided with a partition plate, the partition plate divides the scale body into an upper cylinder and a lower cylinder in the vertical direction, and a connecting hole is opened on the partition plate to connect the upper cylinder and the lower cylinder, the connecting hole is a fan-shaped structure concentric with the partition plate, and at least two dividing strips are evenly arranged in the opening area of ​​the connecting hole, and the dividing strips are arranged along the radial direction of the connecting hole of the fan-shaped structure.

[0007] Preferably, in the above-mentioned double-layer rotor scale, the side of the dividing bar facing the upper cylinder is a conical structure with the tip pointing vertically upward.

[0008] Preferably, in the above-mentioned double-layer rotor scale, a feed port is provided at the top of the upper cylinder, and a discharge port is provided at the bottom of the lower cylinder. The feed port and the discharge port are aligned in the vertical direction, and the projections of the feed port and the connecting hole on the partition plate are located on the same diameter of the partition plate.

[0009] Preferably, in the above-mentioned double-layer rotor scale, a debris removal hole is opened at the bottom of the lower cylinder and is connected to a debris removal device, the debris removal device includes a debris removal bin and a bottom cover arranged at the bottom of the debris removal bin, and an air port is provided on the side wall of the debris removal bin to introduce flow-aiding gas into the interior of the debris removal bin, and the air port is spaced apart from the bottom of the debris removal bin.

[0010] Preferably, in the above double-layer rotor scale, the air port is arranged at the middle position in the height direction of the impurity removal bin, and the air port is provided with a diverter plate to divert the flow-aiding gas into at least two air flows toward the opening area and the bottom area of ​​the impurity removal bin.

[0011] Preferably, in the above-mentioned double-layer rotor scale, the inner wall of the impurity removal bin is further fixedly provided with an electromagnet, the electromagnet is annular and arranged parallel to the bottom cover, or,

[0012] The electromagnets are block-shaped and are evenly and spaced apart on the inner wall of the impurity removal bin.

[0013] Preferably, in the above-mentioned double-layer rotor scale, the bottom cover is a box structure detachably connected to the impurity removal bin via a quick-release clamp, or,

[0014] The bottom cover is a manual or electrically controlled valve structure and is connected to a debris removal pipeline at the bottom.

[0015] Preferably, the above-mentioned double-layer rotor scale further includes a weighing device, a first static support device and a second static support device, and the weighing device, the first static support device and the second static support device are distributed in a triangle and provide three-point support for the scale body.

[0016] Preferably, the above-mentioned double-layer rotor scale further includes a calibration device arranged near the weighing device, the calibration device includes a calibration bracket, an electric push rod, a steel wire rope and a weight, the calibration bracket is fixedly connected to the bearing structure on the double-layer rotor scale, the electric push rod is fixedly set on the calibration bracket, and the weight is suspended on the action end of the electric push rod through the steel wire rope, and the weight is located directly above the calibration area on the weighing device.

[0017] Preferably, in the above-mentioned double-layer rotor scale, the weights include at least two pieces, and during a single calibration process of the weighing device, the calibration device applies at least two different weight indicators for calibration.

[0018] It can be seen from the above technical solution that the double-layer rotor scale provided by the present invention has a partition plate arranged inside the scale body to layer the cavity inside the scale body, and connects the upper cylinder and the lower cylinder through a connecting hole. At least two dividing strips are arranged on the connecting hole to divide the opening area of ​​the connecting hole into multiple areas of the same area. On this basis, when the powder passes through the connecting hole, it will reach the passing areas at different positions on the connecting hole due to different initial speeds, and fall and accumulate in different passing areas under the blocking action of the dividing strips. The dividing strips distinguish the speed of the powder and achieve blocking of the powder, so that the powder can fall and accumulate in the passing areas at different positions on the connecting hole. Under the working condition where the amount of powder used is large, multiple material piles are formed at the bottom of the lower cylinder, and the tops of the multiple material piles form a zigzag or wavy shape, that is, there are multiple vertex areas. Compared with the connecting hole structure without a dividing strip, the material pile can be spread out at the bottom of the lower cylinder, and the height of the highest point of the material pile is reduced, thereby reducing the risk of the top of the material pile invading the upper cylinder, and avoiding the problem of measurement and transportation deviation of the rotor scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic structural diagram of a double-layer rotor scale provided in an embodiment of the present utility model;

[0021] Figure 2 This is an external view of the double-layer rotor scale;

[0022] Figure 3 Schematic diagram of a top view of a partition board;

[0023] Figure 4 A schematic top view of a partition plate provided in another embodiment;

[0024] Figure 5 This is a structural diagram of the impurity removal bin;

[0025] Figure 6 for Figure 5 lateral view of;

[0026] Figure 7 This is a structural diagram of the impurity removal pipeline connected to the bottom of the impurity removal bin;

[0027] Figure 8 Schematic diagram of the calibration device.

[0028] Among them, 10-scale body; 110-upper cylinder; 120-lower cylinder; 130-feed port; 140-discharge port; 150-weighing device; 160-first static support device; 170-second static support device; 20-partition plate; 210-connecting hole; 220-dividing bar; 310-debris removal bin; 320-bottom cover; 330-air port; 340-electromagnet; 350-quick disassembly fixture; 360-valve structure; 370-debris removal pipeline; 410-calibration bracket; 420-electric push rod; 430-wire rope; 440-weight. DETAILED DESCRIPTION

[0029] The core of the utility model is to disclose a double-layer rotor scale with higher accuracy in the measurement and transportation process of powder materials.

[0030] In order to help those skilled in the art better understand the present invention, the following describes embodiments of the present invention with reference to the accompanying drawings. Furthermore, the embodiments described below do not limit the scope of the invention as set forth in the claims. Furthermore, the entire contents of the embodiments described below are not necessarily required to serve as the solution of the invention as set forth in the claims.

[0031] like Figure 1 and Figure 2 As shown, the double-layer rotor scale provided by the present invention comprises a frame and a scale body 10 mounted on the frame. The scale body 10 is used to receive, weigh, and discharge powders. The scale body 10 also includes a drive device that drives a rotor disposed within the internal cavity structure of the scale body 10 to rotate, thereby transporting the powders within the chamber of the scale body 10. Specifically, the cavity structure within the scale body 10 is provided with a partition plate 20. The partition plate 20 vertically separates the scale body 10 into an upper cylinder 110 and a lower cylinder 120, thereby forming a layered structure. The partition plate 20 is provided with a connecting hole 210 connecting the upper cylinder 110 and the lower cylinder 120. The scale body 10 receives powders through the upper cylinder 110, and the rotor drives the powders to move within the upper cylinder 110 to the connecting hole 210 on the partition plate 20. The powders then pass through the connecting hole 210 into the lower cylinder 120, where they are then discharged from the lower cylinder 120 by the rotor. It should be noted that the volumes of the upper cylinder 110 and the lower cylinder 120 are preferably equal, so that the lower cylinder 120 can bear the powder filled in the upper cylinder 110 and improve the uniformity of the two cylinders during operation.

[0032] It should also be noted that, in some embodiments of the present invention, the partition plate 20 is a circular plate structure adapted to the scale body 10, and the communicating hole 210 is a fan-shaped structure concentrically arranged with the partition plate 20. Figure 3As shown, the opening area of ​​the connecting hole 210 is evenly provided with at least two dividing bars 220 to divide the connecting hole 210 into a plurality of small hole areas, and the even provision of the dividing bars 220 here specifically means that after being divided by the dividing bars 220, the connecting hole 210 forms a plurality of areas of equal area. Specifically, in the double-layer rotor scale structure, when the powder material passes through the connecting hole 210 from the upper cylinder 110 to the lower cylinder 120 through the connecting hole 210, the rotor in the upper cylinder 110 will provide a certain initial velocity to the powder. Under the action of inertia, the powder will slide a certain distance in the opening area of ​​the connecting hole 210, and then reach the lower cylinder 120 under the action of gravity, and accumulate at the bottom of the lower cylinder 120. In this process, when the upper cylinder 110 is under the condition of a large filling rate and a large amount of accumulated material, the lower cylinder 120 will be filled with powder. The powder at the bottom of the lower cylinder 120 will continue to accumulate and form a material pile with a sharp corner. The material pile has a conical or triangular structure with one sharp corner facing upward. When the amount of powder used is large, the top tip of the material pile at the bottom of the lower cylinder 120 will invade the upper cylinder 110. There is a risk that the part of the powder that has invaded the upper cylinder 110 will be driven by the rotor to leave the connecting hole 210 during the movement of the rotor and continue to exist in the upper cylinder 110. This will inevitably lead to a difference between the discharge amount of powder and the filling weight, thereby affecting the production process.

[0033] The embodiment of the present invention divides the connecting hole 210 into multiple smaller passing areas by the dividing bar 220. On this basis, since the powder has different distances from the rotor in the upper cylinder 110, when passing through the connecting hole 210, the powder with different initial velocities can reach the passing areas at different positions on the connecting hole 210, and fall and accumulate in different passing areas under the blocking action of the dividing bar 220. The dividing bar 220 distinguishes the speed of the powder and realizes the blocking of the powder, so that the powder can fall and accumulate in the passing areas at different positions on the connecting hole 210. Under the working condition of large powder usage, multiple material piles are formed at the bottom of the lower cylinder 120, and the tops of the multiple material piles form a zigzag or wavy shape, that is, there are multiple vertex areas. Compared with the connecting hole 210 structure without the dividing bar 220, the material pile can be spread out at the bottom of the lower cylinder 120, thereby reducing the height of the highest point of the material pile, thereby reducing the risk of the top of the material pile invading the upper cylinder 110, and avoiding the problem of measurement and transportation deviation of the rotor scale.

[0034] It should be noted that, in the above embodiment, in order to enhance the blocking and limiting effect of the dividing strip 220 on the powder, the dividing strip 220 is preferably arranged along the radial direction of the connecting hole 210 of the fan-shaped structure. During the pushing movement of the powder through the rotor of the upper cylinder 110, the dividing strip 220 arranged along the radial direction can be perpendicular to the movement direction of the powder, and has the maximum blocking area for the powder, thereby enhancing its diversion and stacking effect on the powder.

[0035] Furthermore, considering that there is a certain gap between the rotor and the partition plate 20 in the upper cylinder 110 in the vertical direction, in the process of the powder reaching the lower cylinder 120 from the connecting hole 210, there is a risk that some powder will accumulate on the top of the dividing bar 220 in the connecting hole 210, and the rotor will not be able to scrape it off. Therefore, in some embodiments of the present invention, the dividing bar 220 facing the upper cylinder 110 is a conical structure with the tip pointing vertically upward, such as the dividing bar 220 can be a pointed roof house structure, that is, the dividing bar 220 facing the lower cylinder 120 is a cube or a rectangular parallelepiped, and the side facing the upper cylinder 110 has a pointed roof structure, the pointed roof can be an isosceles pyramid or a pyramid with one side vertically set, and the dividing bar 220 can maintain a sufficient blocking area to block the powder, and the pointed structure at the top can prevent the accumulation of powder. And as Figure 4 As shown, the partition bar 220 can also be configured as a triangular prism structure as a whole, with the tip of one corner of the triangular prism pointing vertically upward to face the upper cylinder 110 to avoid accumulation of powder on the partition bar 220 .

[0036] In addition, in some embodiments of the present invention, a feed port 130 is provided at the top of the upper cylinder 110 for powder to be added from the top, and a discharge port 140 is provided at the bottom of the lower cylinder 120 for powder to be discharged, and the feed port 130 and the discharge port 140 are aligned in the vertical direction. At this time, the powder needs to move 360° in the process of entering from the feed port 130 and being discharged from the discharge port 140. On this basis, the projections of the feed port 130 and the connecting hole 210 on the partition plate 20 are located on the same diameter of the partition plate 20, so that after the powder enters from the feed port 130, it needs to rotate 180° in the process of reaching the connecting hole 210; similarly, when the powder enters the lower cylinder 120 from the connecting hole 210 and is discharged from the discharge port 140, it also needs to rotate 180°. This structure extends the running path of the powder in the scale body 10, and can effectively avoid the risk of powder impact. At the same time, the movement paths of the powder in the upper cylinder 110 and the lower cylinder 120 are similar or the same, so that the two cylinders have similar service lives, avoiding the cost waste of the rotor scale caused by damage to a single cylinder due to long-term use.

[0037] Considering that the powder is only screened before entering the scale body 10, it can remove some of the block, metal and other impurities, but the powder has strong fluidity and some impurities will still be mixed in it, affecting subsequent use. Therefore, in some embodiments of the present invention, a debris removal hole is opened at the bottom of the lower cylinder 120, and the debris removal hole is connected to a debris removal device, such as Figure 1 and Figure 5As shown, the impurity removal device includes an impurity removal bin 310 and a bottom cover 320 disposed at the bottom of the impurity removal bin 310. The impurity removal bin 310 forms a container structure, and the bottom cover 320 is used to release or block the material contained in the impurity removal bin 310. It should also be noted that the impurity removal hole is located directly below the connecting hole 210. As the powder enters the lower cylinder 120 through the connecting hole 210, impurities such as metals and heavy particles have a greater weight and inertia than the powder material and are therefore likely to fall first and fill the impurity removal bin 310. On this basis, the side wall of the impurity removal bin 310 is provided with an air port 330, which is connected to a gas supply device to introduce a flow-aiding gas into the impurity removal bin 310. The flow-aiding gas can screen the effective powder and impurities. By adjusting the flow rate and intensity of the flow-aiding gas, lighter materials can be blown away from the impurity removal bin 310, while heavier impurities cannot be blown away from the impurity removal bin 310 by the flow-aiding gas and fall to the bottom compartment of the impurity removal bin 310. It should be further explained that the air port 330 is preferably spaced apart from the bottom of the impurity removal bin 310 so that the flow-aiding gas can form an airflow layer above the bottom of the impurity removal bin 310, and impurities at the bottom of the impurity removal bin 310 cannot break through the airflow layer and enter the material in the lower cylinder 120, thereby improving the removal and restriction of impurities.

[0038] To further optimize the above technical solution, in some embodiments of the present invention, the air port 330 is positioned at the middle of the height of the impurity removal bin 310. A diverter is provided at the outlet of the air port 330 to direct the flow-enhancing gas. Preferably, the diverter has a symmetrical arc-shaped structure, so as to divert the flow-enhancing gas into two streams: one directed toward the opening of the impurity removal bin 310 and the other directed toward the bottom of the impurity removal bin 310. The flow-enhancing gas directed toward the opening of the impurity removal bin 310 can blow powder that has strayed into the impurity removal bin 310 out of the bin 310, thereby improving the weighing and handling accuracy of the powder. The flow-enhancing gas directed toward the bottom of the impurity removal bin 310 can exert pressure on impurities at the bottom of the impurity removal bin 310, thereby reducing the risk of impurities flying out of the bin 310.

[0039] Furthermore, considering that there are some metal ions in the impurities, the weight difference between them and the powder is small, and they are easy to fly out of the impurity removal bin 310 and continue to contaminate the powder. Therefore, in some embodiments of the present invention, the inner wall of the impurity removal bin 310 is also fixed with an electromagnet 340 to magnetically adsorb the metal impurities and reduce the risk of them flying out of the impurity removal bin 310. It should be noted that the electromagnet 340 can be an annular structure so as to be able to cover the entire range in the circumferential direction and enhance the adsorption effect on the metal impurities. Preferably, the electromagnet 340 is arranged parallel to the bottom cover 320. In order to reduce the cost of the equipment, the electromagnet 340 can also be a block structure, and a plurality of block-shaped battery irons are evenly and spaced apart on the inner wall of the impurity removal bin 310. Each electromagnet 340 bears the adsorption range of the same area in the circumferential direction of the impurity removal bin 310, thereby achieving uniform adsorption and removal of metal impurities.

[0040] Furthermore, in the impurity removal device provided in the embodiment of the present invention, the impurity removal bin 310 is a box structure for carrying impurities, and the bottom cover 320 is used to open in time when the impurity removal bin 310 needs to release the internal material to meet the discharge of impurities. Therefore, in some embodiments of the present invention, such as Figure 5 and Figure 6 As shown, the bottom cover 320 is a box structure detachably connected to the impurity removal bin 310 via a quick-release clamp 350. When the impurity removal bin 310 needs to be cleaned, the power of the scale body 10 is turned off and the quick-release clamp 350 is opened to remove the bottom cover 320 and discharge the impurities. In other embodiments of the present invention, such as Figure 7 As shown, the bottom cover 320 is designed as a valve structure 360, and the side of the bottom cover 320 facing away from the debris removal bin 310 is connected to a debris removal pipeline 370. The debris removal pipeline 370 can be a hose structure for easy bending, and the valve can be a manual or electronically controlled valve structure 360, so that the operator can choose to open or close it when cleaning the debris removal bin 310 is needed, thereby completing the cleaning of the debris removal bin 310.

[0041] In addition, the double-layer rotor scale provided by the embodiment of the present invention also includes a weighing device 150, a first static support device 160 and a second static support device 170 to achieve support and weighing of the scale body 10. Specifically, the weighing device 150, the first static support device 160 and the second static support device 170 are distributed in a triangle to support the scale body 10 at three points. At the same time, the weighing device 150 uses its load-bearing effect to achieve powder weighing of the scale body 10; the weighing device 150 is a commonly used load-bearing structure in rotor scales and will not be described in detail herein. When it is necessary to explain, it is preferred that the weighing device 150, the first static support device 160 and the second static support device 170 are located at the three vertices of an equilateral triangle to achieve a more uniform support effect on the scale body 10.

[0042] On the basis of the above embodiments, in order to avoid the influence of the error of the weighing device 150 on the accuracy of powder delivery, in some embodiments of the present utility model, such as Figure 1 and Figure 8 As shown, the double-layer rotor scale also includes a calibration device arranged near the weighing device 150. It should be noted that the calibration device being near the weighing device 150 here specifically refers to the calibration weight on the weighing device 150 being able to be smoothly placed within the detection area on the weighing device 150. Specifically, the calibration device includes a calibration bracket 410, an electric push rod 420, a steel wire rope 430 and a weight 440, wherein the calibration bracket 410 is fixedly connected to the bearing structure on the double-layer rotor scale to maintain its stability, the electric push rod 420 is fixedly set on the calibration bracket 410, and its action end is set vertically downward, and the weight 440 is suspended on the action end of the electric push rod 420 by the steel wire rope 430, and the weight 440 is located directly above the calibration area on the weighing device 150. Specifically, when the weighing device 150 experiences a measurement error or requires regular calibration, the electric push rod 420 is activated, the actuating end of the electric push rod 420 extends, and the weight 440 descends until the entire weight of the weight 440, connected by the wire rope 430, presses on the weighing device 150, that is, the wire rope 430 is in a relaxed state. The screw rod of the weighing device 150 used to fix the load cell is exposed, so that the weight 440 exerts a force on the load cell through the screw rod. The load cell receives the signal and feeds it back to the sensor display. If the weight displayed on the display is inconsistent with the weight of the weight 440, the data fed back by the weighing device 150 through the display needs to be modified and consistent with the weight of the weight 440. The standard weight of the weight 440 is then used to accurately calibrate the sensor's operating error. After the calibration is completed, the electric push rod 420 is activated and its actuating end retracts, the wire rope 430 is tightened, and the weight 440 is driven away from the weighing device 150, achieving effective and rapid dynamic calibration. It should be noted that the calibration process of the above calibration device can be performed when the scale body 10 is stationary, and can also be performed when the scale body 10 is running.

[0043] In order to improve the calibration accuracy of the calibration device, in some embodiments of the present invention, at least two weights 440 are provided, and the weights of the two weights 440 can be the same or different. During a single calibration of the weighing device 150, the calibration device applies at least two different calibration weights for calibration. For example, a single weight 440 can be provided for the first time, and two weights 440 can be used for the second time. This improves the accuracy of the calibration of the weighing device 150 through at least two calibrations.

[0044] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0045] The above description is merely an illustration of preferred embodiments of the present invention and the technical principles employed, and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. The scope of the present invention is not limited to technical solutions formed by a specific combination of the aforementioned technical features. It also encompasses other technical solutions formed by any combination of the aforementioned technical features or their equivalents, without departing from the scope of the present invention. For example, a technical solution formed by replacing the aforementioned features with (but not limited to) technical features having similar functions disclosed in this invention.

Claims

1. A double-layer rotor scale, characterized in that: It includes a scale body, the interior of which is a hollow structure and is provided with a partition plate, the partition plate divides the scale body into an upper cylinder and a lower cylinder in the vertical direction, and a connecting hole is opened on the partition plate to connect the upper cylinder and the lower cylinder, the connecting hole is a fan-shaped structure concentric with the partition plate, and at least two dividing strips are evenly arranged in the opening area of ​​the connecting hole, and the dividing strips are arranged along the radial direction of the connecting hole of the fan-shaped structure.

2. The double-layer rotor scale according to claim 1, characterized in that: The side of the dividing strip facing the upper cylinder is a conical structure with the tip pointing vertically upward.

3. The double-layer rotor scale according to claim 1, characterized in that: A feed port is provided at the top of the upper cylinder, and a discharge port is provided at the bottom of the lower cylinder. The feed port and the discharge port are aligned in the vertical direction, and the projections of the feed port and the connecting hole on the partition plate are located on the same diameter of the partition plate.

4. The double-layer rotor scale according to claim 3, characterized in that: The bottom of the lower cylinder is provided with a debris removal hole and is connected to a debris removal device. The debris removal hole is provided directly below the connecting hole. The debris removal device includes a debris removal bin and a bottom cover provided at the bottom of the debris removal bin. The side wall of the debris removal bin is provided with an air port for introducing flow-aiding gas into the bin. The air port is spaced apart from the bottom of the debris removal bin.

5. The double-layer rotor scale according to claim 4, characterized in that: The air port is arranged at a middle position in the height direction of the impurity removal bin, and a diverter is provided on the air port to divert the flow-assisting gas into at least two air flows toward the opening area and the bottom area of ​​the impurity removal bin.

6. The double-layer rotor scale according to claim 4, characterized in that: The inner wall of the impurity removal bin is further fixedly provided with an electromagnet, which is annular and arranged parallel to the bottom cover, or, The electromagnets are block-shaped and are evenly and spaced apart on the inner wall of the impurity removal bin.

7. The double-layer rotor scale according to claim 4, characterized in that: The bottom cover is a box structure detachably connected to the debris removal bin via a quick-release clamp, or, The bottom cover is a manual or electrically controlled valve structure and is connected to a debris removal pipeline at the bottom.

8. The double-layer rotor scale according to claim 1, characterized in that: It also includes a weighing device, a first static support device and a second static support device, and the weighing device, the first static support device and the second static support device are distributed in a triangle and provide three-point support for the scale body.

9. The double-layer rotor scale according to claim 8, characterized in that: It also includes a calibration device arranged near the weighing device, the calibration device includes a calibration bracket, an electric push rod, a steel wire rope and a weight, the calibration bracket is fixedly connected to the bearing structure on the double-layer rotor scale, the electric push rod is fixedly set on the calibration bracket, and the weight is suspended on the action end of the electric push rod through the steel wire rope, and the weight is located directly above the calibration area on the weighing device.

10. The double-layer rotor scale according to claim 9, characterized in that: At least two weights are provided, and during a single calibration process of the weighing device, the calibration device applies at least two different calibration weights for calibration.

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