Measuring mechanism for multi-angle measurement of repose angle of powder

Abstract

The utility model provides a measuring mechanism for multi-angle measurement of a repose angle of powder. The measuring mechanism comprises a camera, a rotating mechanism, a material receiving disc, a repose angle platform, a supporting platform, a photoelectric sensor, a motor and a fixed bracket, the rotating mechanism is installed on the supporting platform, the motor drives the rotating mechanism to rotate around the rotating center, two photoelectric sensors are arranged on the fixing support and used for preventing the rotating angle from exceeding the limit and colliding with a rear vertical plate, the rotating base is connected with the supporting platform, a sliding element is installed in the middle of the rotating base, and a rotating arm and a rotating sealing cover are arranged on the rotating base. The camera is a depth camera, interference of background disorder on images can be effectively filtered through a certain algorithm, and the camera is installed on the rotating arm. According to the utility model, the measurement result of the repose angle of the powder is a mean value of repose angle results obtained by measurement at different angles, and the result is more accurate and more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of powder repose angle testers, in particular to a measuring mechanism for measuring the powder repose angle at multiple angles. Background Art

[0002] The angle of repose, also known as the angle of repose, is the angle between the inclined surface of a bulk material and the horizontal plane in its naturally stacked state. The angle of repose is a key parameter for measuring the flowability and internal friction characteristics of bulk materials and is widely used in numerous industries, including the chemical, pharmaceutical, food, metallurgy, and building materials industries.

[0003] Traditional angle of repose measurement methods typically only measure from a single angle, limiting the accuracy and reliability of the results. Furthermore, for some bulk materials with irregular shapes or special properties, single-angle measurements may not fully reflect their true angle of repose characteristics.

[0004] With the continuous advancement of science and technology and the increasing requirements for measurement accuracy in industrial production, there is an urgent need for a technology that can measure the angle of repose at multiple angles to more accurately evaluate the characteristics of bulk materials and provide a more reliable basis for production process optimization and quality control.

[0005] The traditional method for measuring the angle of repose in existing technology uses a protractor to measure the cone formed by the accumulation of powders. With the continuous development of science and technology, new angle of repose measurement technologies have gradually emerged. For example, the use of laser ranging methods and image recognition algorithms to measure the cone formed by the accumulation of bulk materials can improve measurement accuracy and automation.

[0006] Measuring with a protractor requires manual operation, and factors such as angle deviation and reading error can lead to large measurement errors, poor repeatability, low accuracy, long time consumption, and complex operation.

[0007] Measuring the angle of repose using laser ranging or image recognition technology is a single-angle measurement. For some samples with poor fluidity, the angle of repose does not form a standard, symmetrical cone when stacked. Therefore, different results obtained by identifying the angle of repose at different angles can cause measurement errors.

[0008] The use of traditional camera images to identify the angle of repose requires a pure background, so only single-angle measurement can be performed; its image processing algorithm is simple and has poor adaptability, and the accuracy of measuring the angle of repose of non-standard powders is poor. Utility Model Content

[0009] The purpose of the present invention is to provide a measuring mechanism for measuring the angle of repose of powder at multiple angles, so as to solve the problems raised in the above-mentioned background technology.

[0010] To achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0011] A measuring mechanism for measuring the angle of repose of powder at multiple angles, comprising a camera, a rotating mechanism, a receiving tray, a repose angle platform, a supporting platform, a photoelectric sensor, a motor and a fixing bracket;

[0012] The support platform is L-shaped, including a support plate and a connecting plate. The support plate is rectangular with a circular hole in the middle. The repose angle platform is installed in the circular hole of the support plate through a support arm.

[0013] The connecting plate is provided with an arc segment and an extended connecting segment, and the support plate is vertically arranged to the connecting segment end of the connecting plate and fixed by bolts;

[0014] A mounting hole is provided in the center of the connecting plate;

[0015] The fixing bracket is arranged directly below the center of the connecting plate, and a mounting hole coaxial with the connecting plate is provided in the center of the fixing bracket;

[0016] The rotating mechanism includes a rotating sealing cover, a rotating base and a rotating arm;

[0017] The rotating base is arranged just above the center of the connecting plate, and a sliding element is installed between the two to reduce the rotation friction and prevent dust from entering and damaging the electrical components below;

[0018] The rotary sealing cover and the rotary arm are both arranged above the rotary base, and the rotary arm is arranged between the rotary base and the rotary sealing cover; and a sealing gasket is installed between the rotary arm and the rotary sealing cover for dust prevention;

[0019] The rotating mechanism is provided with a mounting circular hole;

[0020] The receiving tray is arranged at the upper end of the rotary sealing cover, and the connecting pin at the bottom end of the receiving tray is inserted into the mounting circular hole of the rotating mechanism.

[0021] The motor is arranged below the fixed bracket, the output shaft of the motor is inserted into the mounting hole, and the motor drives the rotating mechanism to rotate around the rotation center;

[0022] The camera is mounted on a rotating arm, which is capable of rotating along a rotation center;

[0023] The center of the camera is aligned with the center of the repose angle platform. During the rotation process, images of the repose angle of the powder on the repose angle platform are continuously obtained and uploaded to the computer. After obtaining the camera image, the computer recognizes the image and calculates the repose angle results at different angles, and finally gives an average angle result.

[0024] The preferred embodiment of the multi-angle measuring mechanism for measuring the angle of repose of powder is that two photoelectric sensors are provided on the fixed bracket to prevent the rotation angle from exceeding the limit and colliding with the rear support plate.

[0025] The preferred embodiment of the multi-angle measuring mechanism for measuring the angle of repose of powder is that the camera adopts a depth camera, which can effectively filter out the interference of background clutter on the image through an algorithm.

[0026] The preferred embodiment of the multi-angle measuring mechanism for measuring the angle of repose of powder is that the rotation center is the outer ring of the support platform.

[0027] The preferred embodiment of the multi-angle measuring mechanism for measuring the angle of repose of powder is that the maximum rotation angle of the camera is limited to 240 degrees. According to theoretical calculation, if the rotation angle is greater than 180 degrees, 360-degree shooting of the angle of repose of powder can be achieved.

[0028] The preferred embodiment of the multi-angle measuring mechanism for measuring the angle of repose of powder is that the radius of the arc segment of the connecting plate ranges from 150 mm to 200 mm, and is determined according to the viewing angle of the camera.

[0029] The preferred embodiment of the multi-angle measuring mechanism for measuring the angle of repose of powder is that the direct drive of the motor can be replaced by a belt drive or a gear drive.

[0030] Method for identifying the angle of repose of powders: Utilize the distance information of the depth camera to extract the foreground image containing the material pile; remove blind spots and background, and retain the foreground image closest to the camera. The powder mask is a side view of the powder pile; due to powder unloading, the upper portion may be relatively smooth, so the upper 1 / 8 is cropped; the cropped shape approximates a trapezoid, and assuming it is a trapezoid, the angle of repose can be calculated. The height of the trapezoid is known, and the area of ​​the trapezoid is calculated, and trigonometric functions can be used to calculate the angle of repose. Compared to the straight-line fitting method, this method is not affected by individual material surface fluctuations, and the calculation results are more stable. The criterion is: less than the distance from the camera to the pallet (camera rotation radius) + the pallet radius.

[0031] Beneficial effects

[0032] This utility model uses image recognition technology to eliminate human manipulation and reading factors, reducing measurement errors and improving repeatability. A rotating mechanism allows the camera to rotate along a single arc, enabling multi-angle measurement of the powder's angle of repose. The resulting angle of repose is the average of the angles measured at different angles, resulting in a more accurate and stable result.

[0033] This technical solution uses a depth camera in conjunction with a certain image algorithm to perform powder repose angle image recognition, which can effectively filter out background interference on the repose angle measurement, and thus obtain an accurate repose angle value; and the powder repose angle recognition method can be adapted to a wider range and has no limitations. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a front view of a measuring mechanism for measuring the angle of repose of powder at multiple angles;

[0035] Figure 2 A top view of a measuring mechanism for measuring the angle of repose of powder at multiple angles.

[0036] Among them, 1. Camera 2. Rotating arm 3. Rotating sealing cover 4. Receiving tray 5. Repose angle platform 6. Support platform 7. Photoelectric sensor 8. Rotating base 9. Motor 10. Fixed bracket 11. Support arm. DETAILED DESCRIPTION

[0037] The present invention will be described clearly and completely below with reference to the following embodiments. It is obvious that the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0038] Please see the attached Figure 1-2 , a measuring mechanism for measuring the angle of repose of powder at multiple angles, comprising a camera 1, a rotating mechanism, a receiving tray 4, a repose angle platform 5, a supporting platform 6, a photoelectric sensor 7, a motor 9 and a fixing bracket 10;

[0039] The support platform 6 is L-shaped and includes a support plate and a connecting plate. The support plate is rectangular and has a circular hole in the middle. The repose angle platform 5 is installed in the circular hole of the support plate through the support arm 11.

[0040] The connecting plate is provided with an arc segment and an extended connecting segment, and the support plate is vertically arranged to the connecting segment end of the connecting plate and fixed by bolts;

[0041] A mounting hole is provided in the center of the connecting plate;

[0042] The fixing bracket 10 is arranged directly below the center of the connecting plate, and a mounting hole coaxial with the connecting plate is provided in the center of the fixing bracket 10;

[0043] The rotating mechanism includes a rotating sealing cover 3, a rotating base 8 and a rotating arm 2;

[0044] The rotating base 8 is arranged just above the center of the connecting plate, and a sliding element is installed between the two to reduce the rotation friction and prevent dust from entering and damaging the electrical components below;

[0045] The rotating sealing cover 3 and the rotating arm 2 are both arranged above the rotating base 8, and the rotating arm 2 is arranged between the rotating base 8 and the rotating sealing cover 3; and a sealing gasket is installed between the rotating arm 2 and the rotating sealing cover 3 for dust prevention;

[0046] A mounting circular hole is provided at the center of the rotating mechanism;

[0047] The receiving tray 4 is arranged at the upper end of the rotary sealing cover 3, and the connecting pin at the bottom end of the receiving tray 4 is inserted into the mounting circular hole of the rotating mechanism;

[0048] The motor 9 is arranged below the fixing bracket 10, and the output shaft of the motor 9 is inserted into the mounting hole, and the motor 9 drives the rotating mechanism to rotate around the rotation center;

[0049] The camera 1 is mounted on a rotating arm 2, which is capable of rotating along a rotation center;

[0050] The center of the camera 1 is aligned with the center of the repose angle platform 5. During the rotation process, images of the repose angle of the powder on the repose angle platform 5 are continuously obtained and uploaded to the computer. After obtaining the camera image, the computer recognizes the image and calculates the repose angle results at different angles, and finally gives an average angle result.

[0051] The fixing bracket 10 is provided with two photoelectric sensors 7 for preventing the rotation angle from exceeding the limit and colliding with the rear support plate.

[0052] The camera 1 is a depth camera that can effectively filter out the interference of background clutter on the image through an algorithm.

[0053] The rotation center is the outer ring of the support platform 10.

[0054] The maximum rotation angle of the camera 1 is limited to 240 degrees. According to theoretical calculation, if the rotation angle is greater than 180 degrees, 360-degree shooting of the powder repose angle can be achieved.

[0055] The radius of the arc segment of the connecting plate is between 150 mm and 200 mm, which is determined according to the viewing angle of the camera 1 .

[0056] The direct drive of the motor 9 can be replaced by a belt drive or a gear drive.

[0057] Method for identifying the angle of repose of powders: Utilize the distance information of the depth camera to extract the foreground image containing the material pile; remove blind spots and background, and retain the foreground image closest to the camera. The powder mask is a side view of the powder pile; due to powder unloading, the upper portion may be relatively smooth, so the upper 1 / 8 is cropped; the cropped shape approximates a trapezoid, and assuming it is a trapezoid, the angle of repose can be calculated. The height of the trapezoid is known, and the area of ​​the trapezoid is calculated, and trigonometric functions can be used to calculate the angle of repose. Compared to the straight-line fitting method, this method is not affected by individual material surface fluctuations, and the calculation results are more stable. The criterion is: less than the distance from the camera to the pallet (camera rotation radius) + the pallet radius.

[0058] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-angle measuring mechanism for measuring the angle of repose of powder, characterized in that: It includes a camera, a rotating mechanism, a receiving tray, a repose angle platform, a supporting platform, a photoelectric sensor, a motor and a fixing bracket; The support platform is L-shaped, including a support plate and a connecting plate. The support plate is rectangular with a circular hole in the middle. The repose angle platform is installed in the circular hole of the support plate through a support arm. The connecting plate is provided with an arc segment and an extended connecting segment, and the support plate is vertically arranged to the connecting segment end of the connecting plate and fixed by bolts; A mounting hole is provided in the center of the connecting plate; The fixing bracket is arranged directly below the center of the connecting plate, and a mounting hole coaxial with the connecting plate is provided in the center of the fixing bracket; The rotating mechanism includes a rotating sealing cover, a rotating base and a rotating arm; The rotating base is arranged directly above the center of the connecting plate, and a sliding element is installed between the two; The rotary sealing cover and the rotary arm are both arranged above the rotary base, the rotary arm is arranged between the rotary base and the rotary sealing cover; and a sealing gasket is installed between the rotary arm and the rotary sealing cover; The rotating mechanism is provided with a mounting circular hole; The receiving tray is arranged at the upper end of the rotary sealing cover, and the connecting pin at the bottom end of the receiving tray is inserted into the mounting circular hole of the rotating mechanism. The motor is arranged below the fixed bracket, the output shaft of the motor is inserted into the mounting hole, and the motor drives the rotating mechanism to rotate around the rotation center; The camera is mounted on a rotating arm, which is capable of rotating along a rotation center; The center of the camera is aligned with the center of the repose angle platform. During the rotation process, images of the repose angle of the powder on the repose angle platform are continuously obtained and uploaded to the computer. After obtaining the camera image, the computer recognizes the image and calculates the repose angle results at different angles, and finally gives an average angle result.

2. A multi-angle measuring mechanism for measuring the angle of repose of powder according to claim 1, characterized in that: The fixing bracket is provided with two photoelectric sensors for preventing the rotation angle from exceeding the limit and colliding with the rear support plate.

3. The multi-angle measuring mechanism for measuring the angle of repose of powder according to claim 1, characterized in that: The camera adopts a depth camera, which can effectively filter out the interference of background clutter on the image through an algorithm.

4. The multi-angle measuring mechanism for measuring the angle of repose of powder according to claim 1, characterized in that: The rotation center is the outer ring of the support platform.

5. The multi-angle measuring mechanism for measuring the angle of repose of powder according to claim 1, characterized in that: The maximum rotation angle of the camera is limited to 240 degrees. According to theoretical calculation, if the rotation angle is greater than 180 degrees, 360-degree shooting of the powder repose angle can be achieved.

6. The multi-angle measuring mechanism for measuring the angle of repose of powder according to claim 1, characterized in that: The radius of the arc segment of the connecting plate ranges from 150 mm to 200 mm, depending on the viewing angle of the camera.

7. The multi-angle measuring mechanism for measuring the angle of repose of powder according to claim 1, characterized in that: The motor direct drive can be replaced by a belt drive or a gear drive.

Images