Rapid sediment repose angle measuring instrument

Abstract

The utility model discloses a rapid sediment repose angle measuring instrument, and relates to the technical field of measuring devices. Comprising a cuboid transparent box body with an opening in the top, a baffle capable of moving up and down is arranged in the transparent box body, and the transparent box body is divided into two parts in the long edge direction; the measuring assembly is movably installed on the outer side face of the front panel of the transparent box body and can move in the horizontal direction and the vertical direction, the measuring assembly comprises a slope measuring instrument, an electronic inclinometer and a laser are installed on the slope measuring instrument, and the electronic inclinometer and the laser are driven by the slope measuring instrument to rotate at the same frequency. Through the water tank similar to a fish tank, natural sediment accumulation is simulated, the high-precision electronic inclinometer is adopted to be matched with the flexible moving laser device, the slope surface of the repose angle of sediment is rapidly aligned, the repose angle is rapidly measured and read from the side face, a result is rapidly and accurately obtained, and repose angle measurement in a liquid medium can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring devices, in particular to a rapid measuring instrument for the angle of repose of sediment. Background Technique

[0002] The angle of repose of sediment is a basic concept in river dynamics and aeolian physics. When sediment accumulates naturally into a mound in a stationary fluid, due to the action of friction, it can form a stable inclined plane at a certain angle without collapsing. The angle φ between this inclined plane and the horizontal plane is called the angle of repose of sediment. Studying the angle of repose of sediment is of great significance. During the engineering design and construction process, understanding and controlling the angle of repose can help engineers ensure the stability and safety of structures and equipment. For example, when designing engineering projects such as bridges, buildings, and mechanical devices, it is necessary to consider the force-bearing situation to ensure that the object will not topple or become unstable after being stressed beyond its angle of repose. In physics and engineering mechanics, the angle of repose is an important concept that can help researchers understand the motion law and stability of objects after being stressed. By studying the angle of repose, scientists can infer the material properties of the object, whether the structural design is reasonable, and the possible problems that may occur after being stressed.

[0003] The test methods in the current research on the angle of repose mainly include three types: the natural stacking method (or funnel method), the rotating cylinder method, and the tilting method. In the funnel method, particles are discharged through a funnel and piled up into a cone on a plane. The angle of repose is determined by measuring the angle between the hypotenuse of the cone and the horizontal plane. Its advantages are that it can be measured using simple instruments and methods, without the need for complex equipment and technology, and is applicable to the measurement of the angle of repose in most cases, capable of providing relatively accurate results. Its disadvantages are that the operator needs to have certain skills and experience, otherwise the measurement results may not be accurate enough and may not be applicable to the measurement of the angle of repose in some special cases, and other methods need to be used for measurement. The rotating cylinder method is to place granular materials in a cylinder with the axis of rotation parallel to the horizontal direction. The angle of repose of the particles is determined by measuring the dynamic slope angle formed by the granular accumulation in the cylinder through rotating the cylinder at a constant rate. Its advantages are that this method does not require complex instruments and equipment, and only a graduated cylinder and the object to be measured are needed for measurement. Its disadvantages are that it is mainly applicable to the measurement of a small amount of sediment particles, and it is not convenient for the measurement of a large amount of sediment particles. And it can only be measured in an air medium. The tilting method is to lay a certain thickness of granular accumulation on a variable slope trough surface. The angle of repose is determined by continuously changing the slope of the trough surface until the granular accumulation slides. Its advantages are that it is simple to operate and has a wide range of applications. Its disadvantages are that an inclined device needs to be set up at a fixed site, and the influence of the bottom boundary of the sand laying on the test results needs to be considered. In some cases, the too large rate of change of the inclination of the object may affect the accuracy of the measurement, and the measurement result is within a range, not an accurate value, thus limiting the scope of application of this method. The common problems of the above three methods are: 1) The measurement of the angle of repose needs to be repeated many times, but the current methods for measuring the angle of repose are slow; 2) It is difficult to achieve the measurement of the angle of repose under liquid media. Summary of the Invention

[0004] In order to overcome the problems in the prior art that the measurement of the angle of repose needs to be repeated many times, the methods for measuring the angle of repose are slow, and it is generally difficult to achieve the measurement of the angle of repose under liquid media, the present utility model provides a rapid measuring instrument for the angle of repose of sediment. Based on a water tank similar to a fish tank to realize the simulation of sediment accumulation under liquid media, a high-precision electronic inclinometer is used outside the water tank in cooperation with a laser device for rapid measurement and reading, having the advantages of high precision, fast measurement, and being able to conduct experiments in liquid media.

[0005] The technical solution adopted by the present utility model is as follows:

[0006] A rapid measuring instrument for the angle of repose of sediment, comprising a cuboid transparent box body with an open top. A baffle that can move up and down is arranged inside the transparent box body, dividing the transparent box body into two parts along the long side direction. It further comprises a measuring assembly, which is movably installed on the outer side of the front panel of the transparent box body and can move along the horizontal and vertical directions. The measuring assembly includes a slope gauge, on which an electronic inclinometer and a laser are installed, and the electronic inclinometer and the laser rotate synchronously under the drive of the slope gauge.

[0007] Preferably, it further comprises two groups of slide rails, which are respectively installed at the top and the right side of the outer side of the front panel of the transparent box body. Sliders are arranged on the slide rails. A one-way bearing is clamped on the slope gauge, and a fixing nut is arranged inside the one-way bearing. A connecting screw passes through the fixing nut in the one-way bearing and is connected to the slider on the slide rail.

[0008] Preferably, it further comprises a transparent waterproof grid paper, which is pasted on the inner wall of the front panel of the transparent box body.

[0009] Preferably, it further comprises a measuring scale with vertical graduations, which is installed on the outer side of the front panel of the transparent box body and is aligned with the baffle.

[0010] Preferably, it further comprises height-adjusting knobs located at the four corners of the bottom of the transparent box body; and a spirit level located on both side faces of the transparent box body.

[0011] The beneficial effect of the present utility model is to provide a rapid measuring instrument for the angle of repose under different fluid medium conditions. Based on a water tank similar to a fish tank, a high-precision electronic inclinometer is used in cooperation with a flexible moving laser device to quickly align the slope of the angle of repose of sediment, and the angle of repose is quickly measured and read from the side, making the result acquisition fast and accurate, and solving the problems of slow measurement of the angle of repose of sediment and difficulty in measuring the angle of repose of sediment in liquid in the background art. Description of the Drawings

[0012] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0013] Figure 2 is the front view of the present invention;

[0014] Figure 3 is a three-dimensional structural schematic diagram of the slope gauge;

[0015] Figure 4 is a three-dimensional structural schematic diagram of the slider;

[0016] Figure 5 is a schematic diagram of the specific experimental operation.

[0017] In the figure: 1. Transparent box body, 2. Slide rail, 3. Level bubble, 4. Height adjustment knob, 5. Baffle, 6. Inclinometer, 7. Connecting screw, 8. One-way bearing, 9. Slope measuring instrument, 10. Laser, 11. Grid paper, 12. Slide block, 13. Fixed nut, 14. Measuring scale. Detailed implementation mode

[0018] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] Embodiment

[0020] This embodiment provides a rapid measuring instrument for the angle of repose of sediment, mainly adopting a design similar to that of a fish tank box body. Specifically, as Figures 1-4 shown, it includes a cuboid transparent box body 1 with an open top. Inside the transparent box body 1, there is a baffle 5 that can move up and down, dividing the transparent box body 1 into two parts A and B along the long side direction. It also includes a measuring assembly, which is movably installed on the outer side of the front panel of the transparent box body 1 and can move horizontally and vertically. The measuring assembly includes a slope measuring instrument 9, on which an electronic inclinometer 6 and a laser 10 are installed. The laser 10 is pasted on the slope measuring instrument 9 through a support. As Figure 3 shown, the electronic inclinometer 6 and the laser 10 are respectively fixed at both ends of the slope measuring instrument. The electronic inclinometer 6 and the laser 10 rotate synchronously under the drive of the slope measuring instrument 9. The electronic inclinometer 6 is a digital display type with an accuracy of 0.05. When the display shows zero degrees, the laser beam emitted by the laser 10 is a horizontal laser beam, and the emitted laser beam is used to coincide with the sediment slope line.

[0021] Specifically, slide rails 2 are respectively installed on the top and right side of the outer side of the front panel of the transparent box body 1, and slide blocks 12 are provided on the slide rails 2. A hole is opened on the slope measuring instrument 9, and a one-way bearing 8 is clamped in the hole. A fixed nut 13 is provided inside the center of the one-way bearing 8. The connecting screw 7 passes through the fixed nut 13 in the one-way bearing 8 and is connected to the slide block 12 on the slide rail 2. The overall rotation of the slope measuring instrument 9 is realized through the one-way bearing 8, and the unidirectionality of the bearing rotation can avoid the influence of the self-weight of the slope measuring instrument 9 on the measurement result.

[0022] Specifically, a transparent waterproof grid paper 11 is also pasted on the inner wall of the front panel of the transparent box body 1 to visually reflect the approximate size of the angle of repose of the sediment.

[0023] Specifically, a measuring scale 14 with vertical scales is also installed on the outer side of the front panel of the transparent box body 1, aligned with the baffle 5, to measure the closing degree of the baffle 15.

[0024] Specifically, height adjustment knobs 4 are provided at the four corners of the bottom of the transparent box body 1 to adjust the overall angle of the measuring device; level bubbles 3 are provided on both sides of the transparent box body 1 to cooperate with the height adjustment knobs to achieve the overall level of the device.

[0025] The specific operation of measuring the angle of repose of sediment using the above device is as follows.

[0026] (1) Put the sediment particles to be measured into the A area of the test instrument, and isolate the test materials in the A area from the B area (the B area is in an empty state at the beginning of the test) with the baffle 5. To facilitate measurement, it is necessary to ensure that the upper surface of the test materials in the A area is flat, as shown in Figure 5 (a).

[0027] (2) Lift the baffle 5 upward so that the baffle 5 does not tilt or shake, and the test materials slowly slide down under the action of gravity to form a natural slope, as shown in Figure 5 (b).

[0028] (3) Rotate the measuring instrument 9 to make the laser beam emitted by the laser 10 coincide with the slope line of the sediment particles, and then read the angle through the electronic inclinometer 6, which is the size of the angle of repose of the sediment.

[0029] This device can also be applied to the measurement of the angle of repose of materials under other fluid medium conditions. The overall operation is simple and the results are accurate.

[0030] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can also make modifications, substitutions and deformations without departing from the spirit and principle of the present utility model.

Claims

1. A rapid measuring instrument for the angle of repose of sediment, characterized by: The invention comprises a rectangular transparent box (1) with an open top, wherein a baffle (5) movable up and down is provided inside the transparent box (1) to divide the transparent box (1) into two parts along the long side direction; and a measuring assembly movably mounted on the outer side of a front panel of the transparent box (1) and movable in the horizontal and vertical directions, wherein the measuring assembly comprises a slope meter (9), wherein an electronic inclinometer (6) and a laser (10) are mounted on the slope meter (9), and the electronic inclinometer (6) and the laser (10) are driven by the slope meter (9) to realize synchronous rotation.

2. The rapid measuring instrument for the angle of repose of sediment according to claim 1, characterized in that: The invention also comprises two sets of slide rails (2), which are respectively mounted on the top and right sides of the outer side of the front panel of the transparent box (1), and a slider (12) is arranged on the slide rails (2); a one-way bearing (8) is clamped on the inclinometer (9), a fixing nut (13) is arranged in the one-way bearing (8), and a connecting screw (7) passes through the fixing nut (13) in the one-way bearing (8) and is connected to the slider (12) on the slide rails (2).

3. The rapid measuring instrument for the angle of repose of sediment according to claim 1, characterized in that: It also comprises transparent waterproof grid paper (11) which is pasted on the inner wall of the front panel of the transparent box (1).

4. The rapid measuring instrument for the angle of repose of sediment according to claim 1, characterized in that: It also comprises a measuring ruler (14) with vertical scale, which is installed on the outer side of the front panel of the transparent box (1) and is aligned with the baffle (5).

5. The rapid measuring instrument for the angle of repose of sediment according to claim 1, characterized in that: It also includes height adjustment knobs (4) located at the four corners of the bottom of the transparent box (1); and level bubbles (3) located on the two side surfaces of the transparent box (1).

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