Anti-turbulent-flow sand collector for sand stabilization and sand blocking effect evaluation
By introducing guide plates and honeycomb tubes for rectification in the sand collector, combined with the staggered arrangement of sand guide tubes, the problem of sampling difficulties caused by unstable airflow in the sand-fixing and sand-blocking area was solved, and more accurate measurement of wind and sand distribution was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING FORESTRY UNIVERSITY
- Filing Date
- 2025-06-17
- Publication Date
- 2026-04-17
AI Technical Summary
Existing sand collectors are difficult to use effectively in evaluating the sand fixation and sand blocking effects because the sand fixation and sand blocking structures affect unstable airflow, resulting in inconsistent wind directions and the formation of eddies. Furthermore, their spatial distribution range is too small and sparse, making it impossible to accurately reflect the distribution of wind and sand.
An anti-turbulence sand collector was designed, which uses an inner pole that is vertically inserted into the sand and an outer sleeve that rotates around the inner pole. A guide plate and a sand guide tube are set up. The sand guide tube is filled with honeycomb tubes to rectify the air. The sand guide tubes are staggered on both sides of the outer sleeve. The guide plate follows the wind direction to ensure sampling accuracy.
It effectively suppresses the influence of eddies, improves sampling accuracy, reflects the distribution of wind and sand in the vertical direction, overcomes the influence of local air flow, and achieves effective sampling in the evaluation of sand fixation and sand-blocking effects.
Smart Images
Figure CN224136842U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of measuring devices specifically used for aerodynamic experiments, and in particular to an anti-turbulence sand collection instrument for evaluating the sand-fixing and sand-blocking effect. Background Technology
[0002] A sand collector is a field scientific instrument specifically designed to measure the flux of sand particles in aeolian sand flows. It is mainly used in fields such as soil and water conservation, desertification control, aeolian physics research, and ecological engineering assessment. Its core function is to quantitatively collect sand particles in aeolian sand flows and analyze their movement patterns (including three forms: creep, jump, and suspension).
[0003] Existing sand collectors have a relatively uniform structure, typically consisting of multiple sand inlet channels on a support that can rotate with the wind direction. Sand enters the filter bag along the sand inlet channels and is then filtered and collected.
[0004] However, existing sand collectors have some problems in certain applications. One scenario is the evaluation of sand fixation and blocking effects. Due to the presence of sand-fixing and blocking structures (such as shrubs) on site, these structures affect airflow, leading to unstable wind direction. The airflow distribution at the location of the sand collector is complex and chaotic. Although the overall orientation of the sand collector is consistent with the wind direction, the local wind direction still forms an angle with the sand guide tube, creating vortices inside the tube. This prevents sand from entering smoothly, and some sand that has already entered may even be carried out by the vortices.
[0005] Taking the sampling site in the Ulan Buh Desert of Inner Mongolia Autonomous Region involved in this utility model as an example, this site uses vegetation for sand fixation and prevention. The airflow near the vegetation (including tall shrubs) is relatively chaotic, making it difficult for the sand collector to effectively sample. This leads to an evaluation of the sand fixation and prevention effect of the vegetation based on the collected wind and sand data being more favorable than the actual effect. At the same time, the distribution range of the sand guide tubes in conventional sand collectors is too small and sparse in space, which cannot reflect the spatial distribution of wind and sand in such chaotic airflow scenarios (in such scenarios, the vertical distribution of wind and sand varies greatly, requiring a smaller sampling interval). In addition, the guide plate is also too small, making it susceptible to local airflow and unable to effectively follow the overall wind direction. Utility Model Content
[0006] This invention provides an anti-turbulence sand collection instrument for evaluating the sand-fixing and sand-blocking effect.
[0007] The technical problem to be solved is that existing sand collectors are difficult to use effectively in areas where airflow is disturbed, and their spatial distribution is too small and sparse.
[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a turbulence-resistant sand collection instrument for evaluating the sand fixation and sand blocking effect, used to collect sand in the wind in areas where sand fixation and sand blocking measures have been taken, including an inner layer pole vertically inserted into the sand, an outer layer sleeve sleeved on the inner layer pole and rotating around the inner layer pole, and sand guide cylinders spaced along the outer layer sleeve from the ground up.
[0009] The outer sleeve is anchored with a guide plate to align the orientation of the sand guide tube with the wind direction. The surface of the guide plate is collinear with the central axis of the outer sleeve, and the central axis of the sand guide tube is parallel to the surface of the guide plate and is horizontally positioned.
[0010] Of the two ends of the sand guide tube, the end closer to the guide plate is the outlet and the other end is the inlet; the outlet of the sand guide tube is fitted with a filter bag, and the inlet is filled with a honeycomb tube parallel to the sand guide tube to prevent the formation of eddies in the sand guide tube.
[0011] In the sand guiding cylinders, the distance between the lowest sand guiding cylinder and the ground shall not exceed 10 centimeters, and the distance between the highest sand guiding cylinder and the ground shall not be less than 1 meter.
[0012] Furthermore, the outlet of the sand guide cylinder has a bag support that is topped at the bottom of the filter bag to suppress the shaking of the filter bag and reduce the fine sand stuck in the fiber gaps of the filter bag. The bag support is a groove-shaped structure formed by the outward extension of the lower half of the cross-section of the sand guide cylinder.
[0013] Furthermore, the honeycomb tube is a burr-free stainless steel honeycomb tube, with the diameter of the circumscribed circle of the cross-section of each honeycomb being 8-15 mm and the length of the honeycomb tube being 3-10 cm.
[0014] Furthermore, the guide plate has a shorter base side at the bottom of a right-angled trapezoid, and the vertical waist of the right-angled trapezoid is attached to and welded to the outer sleeve. The height of the guide plate is not less than 70 cm, and the horizontal outward extension distance from the outer sleeve is not less than 40 cm.
[0015] Furthermore, the sand guide cylinders are staggered on both sides of the outer sleeve and connected to the outer sleeve by a connecting rod with one end fixed to the side of the sand guide cylinder and the other end fixed to the outer sleeve; two adjacent sand guide cylinders are located on both sides of the outer sleeve and the vertical distance between their central axes is no more than 10 centimeters.
[0016] Furthermore, a flooring is also fitted onto the inner upright, and the flooring is attached to the leveled sand surface.
[0017] Furthermore, the outer sleeve is a square tube, the inner upright is inserted into the bearing and fixedly connected to the bearing, the bearing is respectively set at the top and bottom of the outer sleeve, and the outer periphery of the bearing is fixedly connected to the end face of the outer sleeve.
[0018] Compared with existing technologies, the anti-turbulence sand collection instrument of this invention for evaluating sand fixation and sand-blocking effects has the following advantages:
[0019] In this invention, the air entering the sand guide tube is rectified by a honeycomb tube, suppressing radial airflow within the sand guide tube and thus avoiding eddy currents affecting sampling. By staggering the sand guide tubes on both sides of the outer sleeve, the vertical sampling interval can be narrowed (if the sand guide tubes on the left and right sides are aligned, samples from the same height are collected on both sides; considering the limited diameter of the sand guide tubes, they cannot be too densely packed, thus affecting the minimum vertical sampling interval), thereby better reflecting the vertical distribution of windblown sand. The use of an extra-high guide plate overcomes the influence of irregular local airflow and effectively follows the overall wind direction. The combination of these features enables the sand collector to effectively sample in applications evaluating sand fixation and sand-blocking effects. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of an anti-turbulence sand collection device for evaluating the sand-fixing and sand-blocking effect according to the present invention;
[0021] Figure 2 This is a schematic diagram of the sand guide tube structure;
[0022] In the diagram, 1-inner support rod, 11-floor support, 2-outer sleeve, 3-bearing, 4-guide plate, 5-sand guide cylinder, 51-honeycomb tube, 52-bag support, 6-filter bag. Detailed Implementation
[0023] Taking the demonstration project of comprehensive sand control technology for the Yellow River shoreline in the Ulan Buh Desert, which adopted this utility model, as an example, such as Figure 1 As shown, an anti-turbulence sand collection device for evaluating the sand fixation and sand blocking effect is used to collect sand in the wind in areas where sand fixation and sand blocking measures have been taken. It includes an inner pole 1 that is vertically inserted into the sand, an outer sleeve 2 that is sleeved on the inner pole 1 and rotates around the inner pole 1, and sand guide tubes 5 that are spaced along the outer sleeve 2 from the ground to the bottom.
[0024] The outer sleeve 2 is anchored with a guide plate 4 to make the sand guide cylinder 5 face the wind direction. The plate surface of the guide plate 4 is collinear with the central axis of the outer sleeve 2. The central axis of the sand guide cylinder 5 is parallel to the plate surface of the guide plate 4 and is set horizontally.
[0025] Of the two ends of the sand guide tube 5, the end closer to the guide plate 4 is the outlet and the other end is the inlet; the outlet of the sand guide tube 5 is fitted with a filter bag 6, and the inlet is filled with a honeycomb tube 51 parallel to the sand guide tube 5 to prevent the formation of eddies in the sand guide tube 5; the opening of the filter bag 6 is tied to the side of the sand guide tube 5.
[0026] Here, the honeycomb tube 51 suppresses the radial flow of air along the sand guide tube 5. The honeycomb tube 51 is a rectification device that has been proven effective in various fields, including wind tunnels and gas systems. It can effectively suppress the generation of eddies and ensure that the airflow can only flow axially. At the same time, the honeycomb tube 51 has low wind resistance and will not affect the airflow entry.
[0027] In the sand guide tube 5, the distance between the bottommost sand guide tube 5 and the ground should not exceed 10 centimeters. The bottommost sand guide tube 5 collects wind-blown sand close to the ground, which is of special significance and should be as low as possible. However, it should not be completely close to the ground to avoid sand from pouring in directly.
[0028] The distance between the topmost sand guide tube 5 and the ground is no less than 1 meter, thus ensuring sufficient spatial distribution for sampling.
[0029] The outlet of the sand guide cylinder 5 has a bag support 52 at the bottom of the filter bag 6 to suppress the shaking of the filter bag 6 and reduce the fine sand stuck in the fiber gaps of the filter bag 6. The bag support 52 is a groove-shaped structure formed by the outward extension of the lower half of the cross-section of the sand guide cylinder 5.
[0030] In this embodiment, the filter bag 6 is a non-woven bag. This type of bag has a very low pressure drop and excellent filtration effect, but sand stuck in the fiber gaps is difficult to pour out, affecting the measurement results. Therefore, a bag support 52 is used, so most of the sand is in the bag support 52 rather than in the filter bag 6. The outlet of the sand guide cylinder 5 can be tilted downwards slightly to prevent sand loss.
[0031] The honeycomb tube 51 is a burr-free stainless steel honeycomb tube. The diameter of the circumscribed circle of the cross-section (hexagon) of each honeycomb is 8-15 mm, and the length of the honeycomb tube 51 is 3-10 cm.
[0032] The honeycomb tube 51 cannot be made of plastic, as plastic is not wear-resistant and will develop burrs over time, affecting sand entry. It also cannot be made of easily rusting metals, as rust will also hinder sand entry; therefore, stainless steel is chosen. The cross-section of the honeycomb cannot be too small; too small a cross-section results in excessive wall effect, leading to unpredictable consequences, while too large a cross-section fails to effectively rectify airflow. Practice shows that a range of 8-15 mm is most suitable.
[0033] As for the length of the honeycomb tube 51, since the application scenario of this utility model is different from that of wind tunnels, it is only necessary to suppress eddies and not to have particularly uniform flow. Therefore, the honeycomb tube 51 does not need to be too long. More than 3 centimeters is enough. However, it should not be too long, as it would be difficult to clean.
[0034] The guide plate 4 is a right trapezoid with the shorter bottom edge at the bottom. The vertical waist of the right trapezoid is attached to the outer sleeve 2 and welded to the outer sleeve 2. The height of the guide plate 4 is not less than 70 cm, and the horizontal outward extension distance from the outer sleeve 2 is not less than 40 cm.
[0035] The guide plate 4 here is much higher and has a much larger area than that in a typical sand collector, thus overcoming the influence of irregular local air flow and effectively following the overall wind direction.
[0036] The sand guide cylinders 5 are staggered on both sides of the outer sleeve 2 and are connected to the outer sleeve 2 by a connecting rod that is fixed at one end to the side of the sand guide cylinder 5 and at the other end to the outer sleeve 2; two adjacent sand guide cylinders 5 are located on both sides of the outer sleeve 2 and the vertical distance between their central axes is no more than 10 cm.
[0037] In the application scenario of this invention, the vertical distribution of sand varies greatly, requiring a smaller sampling interval. However, in conventional sand collectors, the sand guide tubes 5 on the left and right sides are aligned, and samples are collected from the same height on both sides. Considering that the sand guide tubes 5 themselves have a certain diameter, they cannot be set too densely, thus affecting the minimum sampling interval in the vertical direction. Therefore, the left and right sides are staggered vertically here.
[0038] An inner upright 1 is also fitted with a flooring 11, which is attached to the leveled sand surface. The flooring 11 is used to ensure that the inner upright 1 does not tilt.
[0039] The outer sleeve 2 is a square tube, and the inner upright 1 is inserted into the bearing 3 and fixedly connected to the bearing 3. The bearing 3 is respectively set at the top and bottom of the outer sleeve 2, and the outer periphery of the bearing 3 is fixedly connected to the end face of the outer sleeve 2, for example, the four corners are spot welded to the outer periphery of the bearing 3.
[0040] This utility model discloses an anti-turbulence sand collection instrument for evaluating sand fixation and sand-blocking effects. Its usage includes the following steps:
[0041] Step 1: Level the ground and insert the inner upright 1 into the sand so that the flooring 11 is in contact with the leveled sand surface;
[0042] Step 2: After the windy day, remove the filter bags 6 at each height and pour the sand (including the sand guide tube 5 and the bag support 52) into the corresponding sample bags.
[0043] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.
Claims
1. An anti-turbulence sand trap for evaluating sand-fixing and sand-blocking effects, for collecting sand in the wind in a region where sand-fixing and sand-blocking measures have been taken, characterized in that it comprises: It includes an inner pole (1) that is vertically inserted into the sand, an outer sleeve (2) that is sleeved on the inner pole (1) and rotates around the inner pole (1), and sand guide cylinders (5) that are spaced along the outer sleeve (2) from the ground up. The outer sleeve (2) is anchored with a guide plate (4) for aligning the orientation of the sand guide cylinder (5) with the wind direction. The surface of the guide plate (4) is collinear with the central axis of the outer sleeve (2). The central axis of the sand guide cylinder (5) is parallel to the surface of the guide plate (4) and is horizontally positioned. Of the two ends of the sand guide tube (5), the end closer to the guide plate (4) is the outlet and the other end is the inlet; the outlet of the sand guide tube (5) is fitted with a filter bag (6), and the inlet is filled with a honeycomb tube (51) parallel to the sand guide tube (5) to prevent the formation of eddies in the sand guide tube (5). In the sand guide tube (5), the distance between the bottommost sand guide tube (5) and the ground does not exceed 10 centimeters, and the distance between the topmost sand guide tube (5) and the ground is not less than 1 meter.
2. The anti-turbulence sand trap according to claim 1, characterized in that: The outlet of the sand guide cylinder (5) has a bag support (52) that supports the bottom of the filter bag (6) to suppress the shaking of the filter bag (6) and reduce the fine sand stuck in the fiber gaps of the filter bag (6). The bag support (52) is a groove-shaped structure formed by extending the lower half of the cross-section of the sand guide cylinder (5) outward.
3. The anti-turbulence sand trap of claim 1, wherein: The honeycomb tube (51) is a burr-free stainless steel honeycomb tube, with the diameter of the outer circle of the cross-section of each honeycomb being 8-15 mm and the length of the honeycomb tube (51) being 3-10 cm.
4. The anti-turbulence sand trap of claim 1, wherein: The guide plate (4) has a short bottom edge in the shape of a right trapezoid. The vertical waist of the right trapezoid is attached to the outer sleeve (2) and welded to it. The height of the guide plate (4) is not less than 70 cm and the horizontal distance extending outward from the outer sleeve (2) is not less than 40 cm.
5. The anti-turbulence sand trap of claim 1, wherein: The sand guide cylinders (5) are staggered on both sides of the outer sleeve (2) and connected to the outer sleeve (2) by a connecting rod with one end fixed to the side of the sand guide cylinder (5) and the other end fixed to the outer sleeve (2); two adjacent sand guide cylinders (5) are located on both sides of the outer sleeve (2) and the vertical distance between their central axes is no more than 10 cm.
6. The anti-turbulence sand trap of claim 1, wherein: The inner upright (1) is also fitted with a flooring (11), which is attached to the leveled sand surface.
7. The anti-turbulence sand collection instrument for evaluating sand fixation and sand-blocking effects according to claim 1, characterized in that: The outer sleeve (2) is a square tube, and the inner upright (1) is inserted into the bearing (3) and fixedly connected to the bearing (3). The bearing (3) is respectively set at the top and bottom of the outer sleeve (2), and the outer periphery of the bearing (3) is fixedly connected to the end face of the outer sleeve (2).