An automatic measurement device for coarse particle angle of repose based on photogrammetry

Abstract

The utility model provides a kind of coarse particle angle of repose automatic measuring device based on photogrammetry, belong to road subgrade filler filling technical field.Measuring device includes stand, sample container, adjusting piece and measuring assembly.Sample container is set on stand, sample container has along vertical direction arranged loading port and discharge port, loading port is configured as filling particle, discharge port is configured as unloading particle.Adjusting piece is arranged in sample container and is detachably connected with sample container, adjusting piece has adjusting part, adjusting part cover is equipped in discharge port, adjusting part can be surrounded and set out the funnel mouth of multiple different shapes, funnel mouth is communicated with discharge port.Measuring assembly is configured as the angle of repose of sample, which is formed by the particle in sample container falling and accumulating through funnel mouth.The utility model can improve the forming precision of sample angle of repose.

Description

Technical Field

[0001] This utility model relates to the field of roadbed filling technology, and in particular to an automatic measuring device for the angle of repose of coarse particles based on photogrammetry technology. Background Technology

[0002] The angle of repose of a sample formed by particle accumulation is one of the important parameters of granular materials, reflecting the internal friction angle of the material. The angle of repose is a key parameter in civil engineering, directly affecting the natural stability of materials such as soil and gravel, and the safety of engineering structures. The usual method for measuring the angle of repose of granular materials involves allowing the particle aggregate to form a sample accumulation under gravity, and then measuring the angle between the generatrix of the sample and the horizontal line. However, the smoothness of the particle descent affects the surface undulation of the sample, which in turn affects the accuracy of the angle of repose measurement. Utility Model Content

[0003] This invention provides an automatic measuring device for the angle of repose of coarse particles based on photogrammetry technology, the purpose of which is to improve the forming accuracy of the angle of repose of the sample.

[0004] To achieve the above objectives, this utility model provides an automatic measuring device for the angle of repose of coarse grains based on photogrammetry technology, comprising:

[0005] The columns extend vertically.

[0006] A sample container is disposed on the column, the sample container having a loading port and a unloading port arranged along the vertical direction, the loading port being configured to load particles, and the unloading port being configured to unload the particles;

[0007] An adjusting component is disposed inside the sample container and detachably connected to the sample container. The adjusting component has an adjusting part, which covers the discharge port. The adjusting part can form a funnel opening of various different shapes, and the funnel opening is connected to the discharge port.

[0008] The measuring component is configured to measure the angle of repose of a sample formed by the accumulation of particles located within the sample container as they fall through the funnel opening.

[0009] In one embodiment, there are multiple adjusting members arranged circumferentially along the sample container, and the adjusting members have various shapes so that they can form funnel openings of various different shapes.

[0010] In one embodiment, the sample container includes a container body, a support protrusion, and a slot. The container body has the filling port, the support protrusion surrounds the container body and forms the discharge port, the slot is disposed on the support protrusion and extends along the extension direction of the support protrusion, the slot has a clearance opening, the adjusting member includes a fixing rod and an abutment portion, the two sides of the abutment portion are respectively connected to the fixing rod and the adjusting member, the fixing rod is disposed in the slot, and the clearance opening is used to avoid the abutment portion so that the abutment portion can abut against the support protrusion so that the adjusting member can cover the discharge port.

[0011] In one embodiment, the column has a plurality of mounting holes arranged along the vertical direction, and the sample container is bolted to the column through the mounting holes so that the height of the sample container can be adjusted.

[0012] In one embodiment, the measuring device includes a vibration assembly, one side of which is connected to the column and the other side of which abuts against the sample container to apply vibration to the sample container.

[0013] In one embodiment, the column has a plurality of mounting holes arranged along the vertical direction, and the vibration assembly is bolted to the column through the mounting holes so that the height of the vibration assembly can be adjusted.

[0014] In one embodiment, the measurement component includes an electrically connected camera configured to capture images of the sample.

[0015] In one embodiment, the measurement component further includes a fill light connected to the camera, the fill light being configured to emit light to illuminate the sample.

[0016] In one embodiment, the measuring device includes a rotating platform that is rotatable relative to the ground. The rotating platform is disposed below the sample container along the vertical direction so that the particles located in the sample container can fall onto the rotating platform through the funnel opening.

[0017] In one embodiment, the rotating platform includes a rotating body and a buffer pad, the buffer pad being disposed on the rotating body along the vertical direction.

[0018] The above-mentioned solution of this utility model has the following beneficial effects:

[0019] In this embodiment, multiple adjusting components are arranged circumferentially along the sample container and are detachably connected. The adjusting part of the adjusting component is covered by the discharge port. Since the adjusting part has various shapes, it can form various funnel openings of different shapes and smaller in size than the discharge port, so that the falling speed and smoothness of the particles are controlled by the funnel opening. On the one hand, the funnel openings of various shapes can adapt to particles of different shapes, thereby reducing the possibility of particles clogging the funnel opening, allowing the particles to fall more smoothly and freely. This helps to reduce the possibility of the sample surface being uneven, reduce the errors generated during the sample accumulation and forming process, and make the angle of repose of the sample formed by particle accumulation closer to the true angle of repose of the particle material itself. The sample forming is more stable and uniform, the sample surface features are obtained more reasonably, and the angle of repose calculation has higher accuracy, thus making the forming accuracy of the angle of repose of the sample of this application higher. On the other hand, the smaller funnel opening can slow down the falling speed of the particles, thereby reducing the possibility of particles ejecting and splashing after falling, which would affect the final shape of the sample.

[0020] Other beneficial effects of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the measuring device in one embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the assembly of the sample container and the adjusting component in one embodiment of the present invention;

[0023] Figure 3 This is a partial cross-sectional view of the sample container and adjustment component after assembly along the vertical direction in one embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the adjusting member in one embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the vibration component in one embodiment of the present invention.

[0026] [Explanation of Labels in the Attached Image]

[0027] 1. Column; 2. Sample container; 2a. Filling port; 2b. Discharge port; 21. Container body; 22. Support protrusion; 23. Slot; 3. Adjusting component; 31. Adjusting part; 31a. Funnel opening; 32. Fixing rod; 33. Abutment part; 4. Measuring component; 41. Camera; 43. Fill light; 5. Vibration component; 51. Vibrator; 52. Vibration main rod; 53. Vibration support rod; 6. Rotating table; 61. Rotating body; 62. Buffer pad. Detailed Implementation

[0028] To make the technical problems, solutions, and advantages of this utility model clearer, a detailed description will be provided below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a locking connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Please see Figure 1 This application provides an automatic measuring device for the angle of repose of coarse grains based on photogrammetry technology, including a column 1, a sample container 2, an adjusting component 3, and a measuring component 4.

[0032] Column 1 extends vertically. For example, please refer to... Figure 1 The first end of column 1 along its own axis is fixedly connected to the ground, while the second end of column 1 is unrestrained. The material of column 1 can be a material with a certain rigidity and strength, such as metal.

[0033] Please see Figure 1 and Figure 2The sample container 2 is mounted on the column 1 so that it can be suspended in the air. The sample container 2 has a loading port 2a and a unloading port 2b arranged vertically. The loading port 2a is configured to load particles, and the unloading port 2b is configured to unload particles. For example, particles enter the sample container 2 through the loading port 2a and fall freely from the sample container 2 through the unloading port 2b, thus accumulating on the ground to form a sample for measuring the angle of repose. See, for example, [link to sample container 2]. Figure 1 and Figure 2 The size of the loading port 2a can be larger than the size of the unloading port 2b, so that the sample container 2 is funnel-shaped. On the one hand, the larger loading port 2a makes it easier to fill the sample container 2 with particles; on the other hand, the smaller unloading port 2b makes it easier to control the speed at which the particles fall.

[0034] Please see Figure 1 and Figure 2 The adjusting component 3 is disposed inside the sample container 2 and detachably connected to it. The adjusting component 3 can be made of a material with certain rigidity and strength, such as Q235B steel plate, with a thickness ranging from 2mm to 5mm. The adjusting component 3 has an adjusting part 31, which covers the discharge port 2b. The adjusting part 31 can form various funnel openings 31a of different shapes, which are connected to the discharge port 2b. It is understood that the size of the funnel opening 31a is smaller than the size of the discharge port 2b. During the free fall of particles from the sample container 2, the speed and smoothness of the fall are controlled by the funnel opening 31a.

[0035] Please see Figure 1 The measuring component 4 is configured to measure the angle of repose of a sample formed by particles located in the sample container 2 falling and accumulating through the funnel opening 31a. For example, when particles located in the sample container 2 fall freely through the funnel opening 31a and accumulate to form a sample, the measuring component 4 is used to measure the angle of repose of the accumulated sample to study the natural stability of the material represented by the particles.

[0036] It should be noted that the angle of repose of the sample is only measured after a large sample has been formed at the bottom of the sample container 2. Therefore, during the process of filling the sample container 2 with particles through the filling port 2a, even if a small amount of particles leak out through the funnel opening 31a, it is not necessary to close the funnel opening 31a, and it has almost no effect on the angle of repose of the sample.

[0037] In one embodiment, please refer to Figure 2 The adjusting member 3 is a rectangular thin sheet. The size of the adjusting member 3 is slightly larger than the size of the discharge port 2b, so that the adjusting member 3 can be set more stably in the sample container 2 and will not come out of the discharge port 2b. The adjusting part 31 of the adjusting member 3 is covered by the discharge port 2b and has a rectangular funnel opening 31a. The size of the funnel opening 31a is smaller than the size of the discharge port 2b.

[0038] In another embodiment, the adjusting member 3 is detachably connected to the sample container 2 inside the sample container. The adjusting part 31 of the adjusting member 3 is covered by the discharge port 2b. The adjusting part 31 can form a funnel opening 31a of various shapes and smaller in size than the discharge port 2b, so that the falling speed and smoothness of the particles are controlled by the funnel opening 31a. On the one hand, the funnel openings 31a of various shapes can adapt to particles of different shapes, thereby reducing the possibility of particles clogging the funnel openings 31a, allowing the particles to fall more smoothly and freely. This helps to reduce the possibility of the sample surface being uneven, reduce the errors generated during the sample accumulation and forming process, and make the angle of repose of the sample formed by particle accumulation closer to the true angle of repose of the particle material itself. The sample forming is more stable and uniform, the sample surface features are obtained more reasonably, and the angle of repose calculation has higher accuracy, thus making the forming accuracy of the angle of repose of the sample of this application higher. On the other hand, the smaller funnel opening 31a can slow down the falling speed of the particles, thereby reducing the possibility of the particles ejecting and splashing after falling, which would affect the final shape of the sample.

[0039] In one embodiment, please refer to Figure 4 There are multiple adjusting members 3, arranged circumferentially along the sample container 2. Multiple adjusting parts 31 are all located over the discharge port 2b. The adjusting parts 31 have various shapes to allow the adjusting members 3 to form various different shaped funnel openings 31a, which communicate with the discharge port 2b. For example, please refer to... Figure 2 The discharge port 2b is configured as a rectangle, and there are four adjusting members 3. These four adjusting members 3 are respectively arranged around the discharge port 2b so that the adjusting parts 31 of the four adjusting members 3 can enclose a funnel opening 31a with a size smaller than the discharge port 2b. The shape of the adjusting parts 31 can vary, so that the shape and size of the funnel opening 31a enclosed by the adjusting parts 31 can also vary, thus making the shape and size of the funnel opening 31a adjustable. For example, various circular funnel openings 31a with different diameters. For example, Figure 4 (a) shows the shape of the adjusting part 31 that encloses the funnel opening 31a in a rectangular shape. Figure 4 (b) shows the shape of the adjusting part 31 that surrounds the funnel opening 31a in a circular shape. Figure 4 (c) shows the shape of the adjustment part 31 that surrounds the funnel opening 31a in an elliptical shape. Due to the small size of the funnel opening 31a, the speed and smoothness of the falling particles during the free fall of the particles from the sample container 2 are controlled by the funnel opening 31a.

[0040] In this embodiment, multiple adjusting members 3 are arranged circumferentially along the sample container 2 and are detachably connected. The adjusting part 31 of the adjusting member 3 is covered on the discharge port 2b. Since the adjusting part 31 has various shapes, the adjusting member 3 can form a funnel opening 31a of various shapes and smaller in size than the discharge port 2b, so that the falling speed and smoothness of the particles are controlled by the funnel opening 31a. On the one hand, the funnel openings 31a of various shapes can adapt to particles of different shapes, thereby reducing the possibility of particles clogging the funnel openings 31a and allowing particles to fall more smoothly and freely. This helps to reduce the possibility of the sample surface being uneven, reduce the errors generated during the sample stacking process, and make the angle of repose of the sample formed by the accumulation of particles closer to the true angle of repose of the particle material itself. The sample forming is more stable and uniform, the sample surface features are obtained more reasonably, and the angle of repose calculation has higher accuracy, thus making the forming accuracy of the angle of repose of the sample of this application higher. On the other hand, the smaller funnel openings 31a can slow down the falling speed of the particles, thereby reducing the possibility of particles ejecting and splashing after falling, which would affect the final shape of the sample.

[0041] In one embodiment, please refer to Figure 3 and Figure 4 The sample container 2 includes a container body 21, a support protrusion 22, and a slot 23. The container body 21 can be made of transparent acrylic, and its surface can be etched with grid lines to allow observation of the particles inside the container body 21. The container body 21 has a filling port 2a. For example, please refer to... Figure 2 The container body 21 can be configured in a frustum shape, making the filling port 2a rectangular. The side length of the rectangular filling port 2a can range from 200mm to 2000mm. A support protrusion 22 surrounds the container body 21, forming the discharge port 2b. That is, the support protrusion 22 protrudes from the container body 21 and forms a predetermined angle with it. Please refer to [link / reference]. Figure 3 and Figure 4 The slot 23 is disposed on the support protrusion 22 and extends along the extension direction of the support protrusion 22. The slot 23 has a clearance opening. The adjusting member 3 includes a fixing rod 32 and an abutment part 33. The two sides of the abutment part 33 are respectively connected to the fixing rod 32 and the adjusting part 31, and the abutment part 33 is located in the middle position of the adjusting member 3. The fixing rod 32 is disposed in the slot 23 to limit the movement of the fixing rod 32 along the particle falling direction. The clearance opening is used to avoid the abutment part 33 so that the abutment part 33 can abut against the support protrusion 22, so that the adjusting part 31 can cover the discharge port 2b, and also so that the adjusting member 3 can not only be detachably connected to the sample container 2, but also maintain relative stability with the sample container 2 during the process of the particles falling through the funnel opening 31a. For example, when the sample container 2 is not filled with particles, such as Figure 1As shown, the adjusting member 3 can be rotated about the axial direction of the fixed rod 32 to be arranged vertically, facilitating replacement of the adjusting member 3 according to the shape and size of the particles. Before filling the sample container 2 with particles, the adjusting member 3 can be rotated about the axial direction of the fixed rod 32 to make the abutting part 33 of the adjusting member 3 abut against the support protrusion 22 of the sample container 2, so that the adjusting member 3 is more securely and detachably connected to the sample container 2. Please refer to... Figure 3 The groove wall of the card slot 23 can also guide the particles to fall, and has little impact on the falling of the particles.

[0042] In one embodiment, the particles are configured as granite crushed stone or ballast. The granite crushed stone particles or ballast particles have a relatively large particle size and fall freely through the small and adjustable funnel opening 31a of this application. On the one hand, the funnel opening 31a of various shapes can adapt to particles of different shapes, thereby reducing the possibility of particles clogging the funnel opening 31a, allowing the particles to fall more smoothly. This helps to reduce the possibility of the sample surface being uneven, reduce the errors generated during the sample accumulation and forming process, and make the angle of repose of the sample formed by particle accumulation closer to the true angle of repose of the particle material itself. The sample formation is more stable and uniform, the sample surface features are obtained more reasonably, and the angle of repose calculation has higher accuracy, thus making the forming accuracy of the angle of repose of the sample of this application higher. On the other hand, the smaller funnel opening 31a can slow down the falling speed of the particles, thereby reducing the possibility of particles ejecting and splashing after falling, which would affect the final shape of the sample.

[0043] It should be noted that for smaller particles such as sand, the surface morphology has little impact on the accuracy of the angle of repose. However, for larger particles such as granite gravel and ballast, on the one hand, the impact of the direct fall of larger particles and the probability of blockage will affect the measurement of the angle of repose; on the other hand, the surface of the accumulation sample formed by larger particles is often uneven and the formation process is uncontrollable, resulting in a large measurement error in the angle of repose measurement.

[0044] In one embodiment, the column 1 has a plurality of mounting holes arranged vertically. The sample container 2 is bolted to the column 1 through the mounting holes, so that the height of the sample container 2 can be adjusted to a better falling height for the particles. This helps to adjust the falling speed of the particles and reduce the possibility of the particles ejecting and splashing upon falling, which could affect the final shape of the sample.

[0045] In one embodiment, please refer to Figure 1 and Figure 5The measuring device includes a vibration component 5. One side of the vibration component 5 is connected to the column 1, and the other side of the vibration component 5 abuts against the sample container 2 to apply vibration to the sample container 2. This allows the particles in the sample container 2 to fall more smoothly, evenly, and stably under the vibration of the vibration component 5, thereby reducing the possibility of the particles clogging the funnel opening 31a. This helps to reduce the possibility of the sample surface being undulating, reducing the errors generated during the sample accumulation process. As a result, the angle of repose of the sample formed by the accumulation of particles is closer to the true angle of repose of the particle material itself. The sample formation is more stable and uniform, the sample surface features are more reasonably obtained, and the angle of repose calculation has higher accuracy. Consequently, the forming accuracy of the angle of repose of the sample in this application is higher.

[0046] For example, please refer to Figure 5 The vibration assembly 5 includes a vibrator 51, a main vibrating rod 52, and vibrating support rods 53. One side of the vibrator 51 is connected to the column 1, and the other side is connected to the main vibrating rod 52. The main vibrating rod 52 can be configured in an L-shape, and multiple vibrating support rods 53 are connected to the main vibrating rod 52. The end of the vibrating support rod 53 facing away from the main vibrating rod 52 can abut against the sample container 2. When the vibrator 51 is powered on, it can generate vibration to drive the main vibrating rod 52 to vibrate, which in turn drives the vibrating support rods 53 to vibrate, thereby causing the sample container 2 to vibrate. The end of the vibrating support rod 53 facing away from the main vibrating rod 52 is the vibrating part, which can be spherical, ellipsoidal, or square. The main vibrating rod 52 can be arranged on both sides of the sample container 2 to apply vibration to the sample container 2 from both sides. The vibration frequency, amplitude, etc. of the main vibrating rods 52 located on both sides of the sample container 2 can be different.

[0047] In one embodiment, the column 1 has a plurality of mounting holes arranged in a vertical direction. The vibration component 5 is bolted to the column 1 through the mounting holes so that the height of the vibration component 5 can be adjusted so that the height of the vibration component 5 can be adapted to the height of the sample container 2 so that the vibration component 5 can apply vibration to the sample container 2 better.

[0048] In one embodiment, please refer to Figure 1 The measurement component 4 includes a camera 41 that is electrically connected. The camera 41 is configured to capture samples.

[0049] For example, the camera 41 can be a high-resolution industrial camera, such as a CCD (Charge Coupled Device) industrial camera, with a resolution higher than 1300*1000. The measurement component 4 can also include a tripod, on which the camera 41 is mounted to adjust the height and shooting angle of the camera 41.

[0050] For example, the high-definition image captured by camera 41 is used to subsequently extract the point cloud information of the high-definition image in order to calculate the angle of repose of the sample.

[0051] In this embodiment, the angle of repose of the sample is measured in a non-contact manner to minimize disturbance to the sample. This helps to reduce errors generated during the measurement and calculation of the angle of repose, thereby improving the automation level and resistance to local interference in the angle of repose measurement.

[0052] In one embodiment, please refer to Figure 1 The measurement component 4 also includes a supplementary light 43, which is connected to the camera 41. The supplementary light 43 is configured to emit light to illuminate the sample. For example, the illumination direction of the supplementary light 43 is the same as the shooting direction of the camera 41, providing illumination compensation for the camera 41 so that the shooting area of ​​the camera 41 has better brightness, which is beneficial to improving the shooting effect of the camera 41, and thus enabling the shooting results of the camera 41 to more accurately reflect the angle of repose of the sample.

[0053] For example, the fill light 43 may include a light source and a light source adjustment rod, the light source being connected to the camera 41 via the light source adjustment rod to adjust the height and angle of the light source. The brightness and color temperature of the light source can be adjusted.

[0054] In one embodiment, please refer to Figure 1 The measuring device includes a rotating stage 6, which is rotatable relative to the ground. The rotating stage 6 is vertically positioned below the sample container 2, allowing particles inside the sample container 2 to fall onto the rotating stage 6 through the funnel opening 31a. When the particles in the sample container 2 accumulate on the rotating stage 6 to form a sample, rotating the rotating stage 6 will cause the sample to rotate. This allows for omnidirectional measurement of the angle of repose of the sample without changing the measurement orientation of the measuring component 4, thus improving the convenience of measuring the angle of repose of the sample.

[0055] In one embodiment, please refer to Figure 1 The rotating platform 6 includes a rotating body 61 and a buffer pad 62, which is vertically disposed on the rotating body 61. The buffer pad 62 can absorb the kinetic energy of the particles when they fall, so as to reduce the possibility of the particles ejecting and splashing after falling, which may affect the final shape of the sample.

[0056] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. An automatic measuring device for the angle of repose of coarse grains based on photogrammetry technology, characterized in that, include: The columns extend vertically. A sample container is disposed on the column, the sample container having a loading port and a unloading port arranged along the vertical direction, the loading port being configured to load particles, and the unloading port being configured to unload the particles; An adjusting component is disposed inside the sample container and detachably connected to the sample container. The adjusting component has an adjusting part, which covers the discharge port. The adjusting part can form a funnel opening of various different shapes, and the funnel opening is connected to the discharge port. The measuring component is configured to measure the angle of repose of a sample formed by the accumulation of particles located within the sample container as they fall through the funnel opening.

2. The automatic measuring device for the angle of repose of coarse grains based on photogrammetry technology according to claim 1, characterized in that, The number of adjustment components is multiple, and the multiple adjustment components are arranged circumferentially along the sample container. The shape of the adjustment components is multi-faceted, so that the multiple adjustment components can form funnel openings of various different shapes.

3. The automatic measuring device for the angle of repose of coarse grains based on photogrammetry technology according to claim 2, characterized in that, The sample container includes a container body, a support protrusion, and a slot. The container body has the filling port. The support protrusion surrounds the container body and forms the discharge port. The slot is disposed on the support protrusion and extends along the extension direction of the support protrusion. The slot has a clearance opening. The adjusting member includes a fixing rod and an abutment. The two sides of the abutment are respectively connected to the fixing rod and the adjusting member. The fixing rod is disposed in the slot. The clearance opening is used to avoid the abutment, so that the abutment can abut against the support protrusion, and so that the adjusting member can cover the discharge port.

4. The automatic measuring device for the angle of repose of coarse grains based on photogrammetry technology according to claim 1, characterized in that, The column has multiple mounting holes arranged along the vertical direction, and the sample container is bolted to the column through the mounting holes so that the height of the sample container can be adjusted.

5. The automatic measuring device for the angle of repose of coarse grains based on photogrammetry technology according to claim 1, characterized in that, The measuring device includes a vibration assembly, one side of which is connected to the column and the other side of which abuts against the sample container to apply vibration to the sample container.

6. The automatic measuring device for the angle of repose of coarse grains based on photogrammetry technology according to claim 5, characterized in that, The column has multiple mounting holes arranged along the vertical direction, and the vibration assembly is bolted to the column through the mounting holes so that the height of the vibration assembly can be adjusted.

7. The automatic measuring device for the angle of repose of coarse grains based on photogrammetry technology according to claim 1, characterized in that, The measurement component includes a camera configured to capture images of the sample.

8. The automatic measuring device for the angle of repose of coarse grains based on photogrammetry technology according to claim 7, characterized in that, The measurement assembly also includes a supplementary light connected to the camera, the supplementary light being configured to emit light to illuminate the sample.

9. The automatic measuring device for the angle of repose of coarse grains based on photogrammetry technology according to claim 1, characterized in that, The measuring device includes a rotating platform that can rotate relative to the ground. The rotating platform is positioned below the sample container along the vertical direction so that the particles inside the sample container can fall onto the rotating platform through the funnel opening.

10. The automatic measuring device for the angle of repose of coarse grains based on photogrammetry technology according to claim 9, characterized in that, The rotating platform includes a rotating body and a buffer pad, the buffer pad being disposed on the rotating body along the vertical direction.

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