Space uniform sand throwing device for wind tunnel experiment

Abstract

The invention relates to a space uniform sand throwing device for a wind tunnel experiment, and belongs to the technical field of scientific research equipment. Comprising three layers of parallel connecting rod-sliding groove mechanisms, and each layer is composed of a driven wheel, a connecting rod, a movable plate and a replaceable square plate with holes. The connecting rod drives the square plate to reciprocate along the sliding groove in the vertical sand grain falling direction. The sand storage chamber continuously supplies sand through a sand conveying belt, and a bottom servo motor synchronously drives three layers of driven wheels through gear meshing. The innovation lies in that the three layers of square plates synchronously reciprocate to form a dynamic screen, the rhythm that sand grains pass through multiple layers of uniform pores is adjusted by combining computer speed control, a uniform sand curtain with controllable length and width is formed in a wind tunnel test section, and the defects that a traditional device is uneven in sand grain distribution, low in control precision and poor in continuity are overcome; the holes (shape / density) of the replaceable square plate are adaptive to sand grains with different grain sizes and the throwing density requirements, the space uniformity, the sand throwing precision and the sand throwing stability are remarkably improved, and the device is suitable for sand movement research and engineering protection verification.

Description

Technical Field

[0001] This invention relates to the field of scientific research equipment technology, specifically to a spatial uniform sand-throwing device for wind tunnel experiments. Background Technology

[0002] In wind tunnel experiments studying wind-blown sand movement, accurately simulating the two-phase flow motion containing solid particles under natural conditions is a crucial means of analyzing wind-blown sand erosion, deposition, and their impact on the environment and infrastructure. The core requirement of these experiments is to precisely control the spatial distribution, velocity, and continuity of particles (sand grains) as they enter the wind tunnel, ensuring the realism of the physical simulation and the reliability of the experimental data. However, traditional particle delivery methods (such as manual or simple mechanical sand delivery) have significant limitations: it is difficult to achieve a uniform spatial distribution of sand grains within the wind tunnel test section, and the controllability of delivery velocity, density, and location is poor, leading to systematic deviations between experimental results and actual natural phenomena.

[0003] To achieve high-fidelity simulation of wind and sand movement, particle delivery must simultaneously meet the dual requirements of spatial uniformity (uniform dispersion of sand particles within a cross-section) and temporal continuity (continuous and stable sand supply). This necessitates that the sand delivery device possess the ability to precisely control the delivery location, instantaneous velocity, and sand volume per unit time. Automated control is also essential to eliminate human error and ensure experimental repeatability. Furthermore, the device must adapt to varying experimental conditions, including different combinations of parameters such as wind speed, sand particle size (e.g., fine sand versus coarse sand), and delivery density.

[0004] Existing sand-throwing devices generally suffer from three major bottlenecks:

[0005] 1. Uneven distribution: Sand particles are prone to localized aggregation or sparse distribution in the wind tunnel, which disrupts the representativeness of the flow field;

[0006] 2. Low control precision: The mechanical structure makes it difficult to fine-tune the release rate and position, resulting in passive parameters;

[0007] 3. Complex operation: It relies on manual intervention, is difficult to support long-term continuous experiments, and has insufficient stability.

[0008] The aforementioned shortcomings severely limit the effectiveness of high-precision wind tunnel experiments, particularly in studies sensitive to particle phase distribution such as erosion dynamics and dust transport. Therefore, there is an urgent need to develop a novel spatially uniform sand-dropping device that integrates mechanical design optimization, automated control technology, and fluid mechanics principles to overcome existing technological bottlenecks and provide reliable experimental support for fundamental research on wind and sand movement, protective engineering design, and environmental assessment. Summary of the Invention

[0009] The purpose of this invention is to provide a spatial uniform sand-throwing device for wind tunnel experiments, so as to overcome the technical problems existing in the prior art.

[0010] To achieve the above technical purposes, reach the above technical effects, the present application provides the following technical solutions:

[0011] A space uniform sand throwing device for wind tunnel experiment, comprising a sand throwing device and a sand storage device, the sand throwing device comprises three layers of link-sluice mechanisms uniformly distributed along the height direction, each layer of link-sluice mechanism comprises: a passive wheel, a link, a movable plate and a square plate with apertures; the movable plate is detachably connected with the square plate through a lock buckle; one end of the link is fixedly connected with the passive wheel, and the other end is hingedly connected with the movable plate, so as to drive the square plate to make reciprocating linear motion in the sluice; the sand storage device comprises a sand conveying belt and a sand storage chamber, and the sand storage device conveys sand particles to the sand throwing device through the sand conveying belt; a servo motor is arranged at the bottom of the device, a rotating shaft of the servo motor drives a driving wheel, and the driving wheel drives the passive wheels of the three layers of link-sluice mechanisms through gear engagement.

[0012] As a further improvement of the above technical solutions:

[0013] Further, the shape and density of the apertures of the square plate can be replaced, and when replaced, the square plate is pulled out along the sluice by unlocking the lock buckle.

[0014] Further, the three layers of link-sluice mechanisms have the same movement rate, and the three layers of passive wheels are synchronously driven by the same servo motor through the driving wheel.

[0015] Further, the servo motor is connected with a computer control system, and the reciprocating movement rate of the square plate is accurately controlled by adjusting the rotating shaft speed of the servo motor.

[0016] Further, the combination of the sand storage device and the sand conveying belt realizes continuous sand throwing, and maintains the space uniform sand curtain in the wind tunnel.

[0017] Further, the reciprocating linear motion direction of the square plate in the sluice is perpendicular to the falling direction of the sand particles, so that the sand particles are uniformly distributed in space after passing through the apertures of the square plate.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] 1. The space distribution uniformity is significantly improved: three layers of parallel link-sluice mechanisms are adopted, the synchronous reciprocating motion of the movable plate is realized under the driving of the servo motor, and the replaceable aperture square plate design is adopted, so that the sand particles fall through the multiple layers of uniformly distributed apertures, effectively overcoming the defects of local aggregation or sparseness of sand particles in the traditional device, and forming a uniform cuboid sand curtain with controllable length and width in the cross section of the wind tunnel test section.

[0020] 2. Realize the accurate automatic control of sand throwing parameters: adopt servo motor as power source, and equip with computer intelligent control system, which can accurately adjust the rotating speed of motor, and then linearly control the reciprocating motion frequency of connecting rod-slotted link mechanism. This makes the sand throwing amount per unit time (throwing rate) and throwing rhythm realize accurate, continuous and flexible adjustment, effectively solves the problems of low control precision, and difficulty to meet different experimental wind speed and particle flux requirements of existing devices.

[0021] 3. Ensure the long time continuity and stability of sand throwing process: combined with the design of sand storage device and sand conveying belt, realize the continuous and stable supply of sand particles to the sand throwing device. The sand conveying system works with the three-layer reciprocating sand throwing device, which can maintain the continuous existence and stable state of uniform sand curtain in the long time period required by wind tunnel experiment, reliably meet the strict requirements of time continuity for wind-sand movement simulation, and overcome the defects of traditional method difficult to throw sand for a long time.

[0022] 4. Improve the multifunctionality and environmental adaptability of the device: thanks to the above-mentioned accurately controllable driving system, easily replaceable square plate assembly and stable and reliable mechanical structure, the device can flexibly adapt to various complex experimental conditions, including but not limited to: different wind speed range of wind tunnel, different particle size of sand materials (by replacing square plate), different target sand throwing density (by adjusting the rotating speed of motor and / or replacing square plate). Its excellent multifunctionality and wide adaptability make it very suitable for various application scenarios such as wind-sand movement basic research, wind-sand engineering protection design verification, traffic facility wind-sand influence evaluation and wind-sand effect test in environmental protection projects. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed to be used in the specific implementation manner. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0024] Fig. 1 It is the overall device structure schematic diagram of the present application;

[0025] Fig. 2 It is the sand storage chamber device structure schematic diagram of the present application;

[0026] Fig. 3 It is the main structure schematic diagram of the sand throwing device of the present application;

[0027] Fig. 4 It is the connecting rod-slotted link mechanism component schematic diagram of the present application.

[0028] Marked in the figure and corresponding part name: 100, sand throwing device; 200, sand storage device; 110, connecting rod-slotted link mechanism; 111, passive wheel; 112, connecting rod; 113, moving plate; 114, square plate; 115, lock catch; 116, slotted link; 117, driving wheel; 120, servo motor; 210, sand conveying belt; 220, sand storage chamber; 221, long slot; 222, iron stick. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0030] The present application will be further described below with reference to the drawings.

[0031] The embodiment of the present application provides a spatially uniform sand throwing device for wind tunnel experiment, which solves the problems of spatial uniformity of sand throwing, accurate control of flow and long-time continuous operation through three-layer synchronous screening mechanism and computer intelligent control.

[0032] Please refer to Figs. 1 to 4 The spatially uniform sand throwing device for wind tunnel experiment provided by the embodiment of the present application comprises a sand throwing device 100 and a sand storage device 200. The sand throwing device 100 comprises three layers of connecting rod-slotted link mechanisms 110 which are uniformly distributed along the height direction. Each layer of connecting rod-slotted link mechanism 110 comprises a passive wheel 111, a connecting rod 112, a moving plate 113 and a square plate 114 with apertures. The moving plate 113 is detachably connected with the square plate 114 through a lock catch 115. One end of the connecting rod 112 is fixedly connected with the passive wheel 111, and the other end is hingedly connected with the moving plate 113, so as to drive the square plate 114 to make reciprocating linear motion in the slotted link 116. The sand storage device 200 comprises a sand conveying belt 210 and a sand storage chamber 220, which conveys sand particles to the sand throwing device 100 through the sand conveying belt 210. A servo motor 120 is arranged at the bottom of the sand throwing device 100, and the rotating shaft of the servo motor 120 drives a driving wheel 117. The driving wheel 117 drives the passive wheels 111 of the three layers of connecting rod-slotted link mechanisms 110 through gear engagement.

[0033] The spatially uniform sand throwing device for wind tunnel experiment provided by the embodiment of the present application further has replaceable aperture shape and density of the square plate 114, which can be replaced by unlocking the lock catch 115 and pulling the square plate along the slotted link 116.

[0034] The wind tunnel experiment space uniform sand throwing device provided by the embodiment further has the same movement rate of the three-layer connecting rod-slotted link mechanism 110, and the same servo motor 120 synchronously drives the three-layer passive wheels 111 through the driving wheel 117.

[0035] The wind tunnel experiment space uniform sand throwing device provided by the embodiment further has the servo motor 120 connected with a computer control system, and the reciprocating movement rate of the square plate 114 is accurately controlled by adjusting the rotating shaft speed of the servo motor 120.

[0036] The wind tunnel experiment space uniform sand throwing device provided by the embodiment further has the combination of the sand storage chamber 210 and the sand conveying belt 210 to realize continuous sand throwing and maintain the space uniform sand curtain in the wind tunnel.

[0037] The wind tunnel experiment space uniform sand throwing device provided by the embodiment further has the reciprocating linear movement direction of the square plate 114 in the slotted link 117 being perpendicular to the sand particle falling direction, so that the sand particles are uniformly distributed after passing through the gap of the square plate 114.

[0038] The working principle of the present application is as follows: the bottom servo motor 120 drives the driving wheel 117 to rotate through the rotating shaft, and the rotation of the driving wheel 117 drives the passive wheel 111 engaged therewith to rotate. The passive wheel 111 is connected to a moving plate 113 through a connecting rod 112. Since the connecting point of the connecting rod 112 and the moving plate 113 is fixed, when the passive wheel 111 rotates, the moving plate 113 is pulled to move. The moving plate 113 is connected with the square plate 114 with specific apertures through the lock catch 115, and the movement of the moving plate 113 forces the square plate 114 to make accurate linear reciprocating movement in the fixed slotted link 116. The connecting rod-slotted link mechanism 110 has three layers which are uniformly distributed in height. The passive wheels 111 of the three-layer connecting rod-slotted link mechanism 110 are driven by the same servo motor 120, and this design ensures that the three-layer square plates 114 strictly synchronously move at the same speed. The sand particles in the sand storage device 200 are continuously and stably conveyed to the top of the sand throwing device 100 through the sand conveying belt 210. Further, the sand conveying belt 210 is designed to move forward and backward, so that the sand particles freely fall from the sand conveying belt 210 to the sand storage chamber 220. The sand storage chamber 220 is specifically configured as a sand throwing box, and the bottom of the sand throwing box is provided with a long slot 221 in which a cylindrical iron rod 222 is embedded; by adjusting the lifting height of the iron rod 222, the falling speed of the sand particles from the gap is controlled, and in combination with the gear mechanism control lifting step, the sand amount per unit time can be accurately adjusted to realize the fine adjustment of the sand throwing speed

[0039] Sand particles fall from above, through three layers of square plates 114 that are doing synchronous reciprocating motion. As the sand particles pass through the three layers of square plates 114, the aperture regions of the three layers of square plates 114 are constantly interlaced in space due to the synchronous reciprocating motion. This dynamic and regular sweeping process effectively disperses and mixes the sand particles in the injection cross section, and finally forms a continuous sand curtain with uniform spatial distribution and approximately cuboid shape at the wind tunnel inlet. By precisely adjusting the rotation speed of the servo motor 120 through the computer control system, the frequency of the reciprocating motion of the square plates 114 can be adjusted, thereby controlling the density and uniformity of sand injection to adapt to the experimental requirements of different wind speeds, sand particle sizes, and injection densities. The replaceable square plates 114 design allows different aperture sizes or distributions of plates to be rotated according to different experimental requirements.

[0040] In the description of the present specification, the description of the terms "one embodiment", "an example", "a specific example", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0041] The preferred embodiments of the application disclosed above are only used to help explain the application. The preferred embodiments do not describe all the details and limit the application to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of the present specification. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the application, so that those skilled in the art can well understand and utilize the application. The application is limited only by the claims and their full scope and equivalents.

Claims

1. A spatially uniform sand injection device for wind tunnel experiments, comprising a sand injection device (100) and a sand storage device (200), characterized in that, The sand throwing device (100) comprises three layers of linkage-slotted link mechanisms (110) uniformly distributed along the height direction, each layer of linkage-slotted link mechanism (110) comprising: a passive wheel (111), a linkage (112), a moving plate (113) and a square plate (114) with apertures; the moving plate (113) is detachably connected with the square plate (114) through a lock buckle (115); one end of the linkage (112) is fixedly connected with the passive wheel (111), and the other end is hingedly connected with the moving plate (113), thereby driving the square plate (114) to make a reciprocating linear motion in the slotted link (116); the sand storage device (200) comprises a sand conveying belt (210) and a sand storage chamber (220), and the sand storage device (200) conveys sand particles to the sand throwing device (100) through the sand conveying belt (210); a servo motor (120) is arranged at the bottom of the sand throwing device (100), the rotating shaft of the servo motor (120) drives a driving wheel (117), and the driving wheel (117) simultaneously drives the passive wheels (111) of the three layers of linkage-slotted link mechanisms (110) through gear engagement.

2. The spatially uniform sand injection device for wind tunnel experiments according to claim 1, characterized in that The apertures of the square plate (114) can be replaced in shape and density, and the replacement is realized by unlocking the lock buckle (115) and pulling the square plate (114) along the slotted link (116).

3. The spatially uniform sand injection device for wind tunnel experiments according to claim 1, characterized in that, The three layers of linkage-slotted link mechanisms (110) have the same motion rate, and the three layers of passive wheels (111) are synchronously driven by the same servo motor (120) through the driving wheel (117).

4. The spatially uniform sand injection device for wind tunnel experiments according to claim 1, characterized in that, The servo motor (120) is connected with a computer control system, and the reciprocating motion rate of the square plate (114) is accurately controlled by adjusting the rotating shaft speed of the servo motor (120).

5. The spatially uniform sand injection device for wind tunnel experiments according to claim 1, characterized in that, The combination of the sand storage device (200) and the sand conveying belt (210) realizes continuous sand throwing, and maintains the realization of a spatially uniform sand curtain in the wind tunnel.

6. The spatially uniform sanding device for use in a wind tunnel experiment according to any one of claims 1 to 5, characterized in that The reciprocating linear motion direction of the square plate (114) in the slotted link (116) is perpendicular to the falling direction of the sand particles, so that the sand particles are uniformly distributed in space after passing through the apertures of the square plate (114).

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