CN202281743U

CN202281743U - Sand grain impactor

Info

Publication number: CN202281743U
Application number: CN 201120285242
Authority: CN
Inventors: 董治宝; 赵爱国; 张智
Original assignee: Cold and Arid Regions Environmental and Engineering Research Institute of CAS
Current assignee: Cold and Arid Regions Environmental and Engineering Research Institute of CAS
Priority date: 2011-08-05
Filing date: 2011-08-05
Publication date: 2012-06-20
Anticipated expiration: 2021-08-05

Abstract

The utility model relates to a sand grain impactor, which is structurally characterized in that a piston sleeve is mounted in a long pipe; a front piston and a rear piston are arranged in the piston sleeve; a spring is mounted between the front piston and a positioning sleeve; central holes are formed on the positioning sleeve and a front piston axis; a bored front cover is tightly hooped to the long pipe; a spring is arranged between the rear piston and a rear plug; a rear cover is tightly hooped to the long pipe; a notch is arranged on one side of the long pipe; a base is arranged at the bottom of the long pipe; a pulling plug fixedly connected onto the rear piston is arranged in the notch; concave holes are formed on the long pipe and the bottom part of the rear piston; positioning pins are inserted in the concave holes; and the long pipe is placed on a support. The sand grain impactor has a simple structure, is convenient to load and unload, can be used for the 0.25 to 1.00mm sand grain motion test, and provides a testing method for researching the single sand grain track motion.

Description

Grains of sand knocker

Technical field

The utility model relates to a kind of utensil that the laboratory study blown sand physics grains of sand impact husky bed surface that is used for.

Background technology

Nearly half a century, China scientific worker obtains perceptual knowledge intuitively in a large number through field inspection test and theoretical continuous exploration aspect blown sand physics research, accumulated related data.Observational study finds that dust storm moves two kinds of basic modes: the mobile and stream of promptly whole sand dune body.The condition (starting wind velocity) that produces stream is generally 5ms ^-1～6ms ^-1S ^-On bare land, sand particle size is that 0.25mm, 0.50mm and the 1.00mm speed of blowing are 6.8ms ^-1, 8.1ms ^-111.7ms ^-1The size of starting wind velocity receives multiple influence of going up factor, like sand ground moisture, and surface condition and sand particle size.Observe from above-mentioned extensive area, the resultant wind that air-flow near the ground is always depended in grains of sand motions to.But from observing among a small circle, grains of sand moving direction changes the shifting wind of direction again with single positive wind direction or after influenced by ninor feature, and promptly secondary flow shifts.

Dust storm moves, and sees it is whole stream motion from macroscopic view, sees it is moving of countless individual particles from microcosmic.The stressed mechanism that particle moves in air-flow is the key problem of dust storm movement of particles, is engaged in stream scientific research scholars and recognizes, grains of sand saltation is the major reason that causes various hazardss of sand storms; To scientificlly and effectively prevent the also necessary understanding dust storm of hazards of sand storms movement of particles; The mechanism of saltation particularly, but the dust storm motion is a kind of carrying phenomenon of pressing close to the air-flow on the face of land to the grains of sand, and also the grains of sand are tiny; Geometric configuration is irregular; Motion change is rapid, adopts general means of testing and direction to be difficult to confirm all key elements of dust storm movement of particles, and the stressed mechanism of particle comprises two aspects; The one, stressed in motion moment, the 2nd, particle stressed in the saltation process.The dust storm motion at first considers to show as the interaction of the individual particle grains of sand and air-flow, movement of particles takes place at first will start with from the individual particle motion study to the deep understanding of dust storm locomotory mechanism.And the progress of individual particle motion theory aspect is very little.Theoretic breakthrough depends on the innovation of research means, must be by means of the research and development of scientific research equipment, and therefore, the advanced person of research technique is very big for the research relation of dust storm movement of particles.

Summary of the invention

In view of above-mentioned, the purpose of the utility model is to provide a kind of grains of sand knocker.Utilize this instrument, under the cooperation of high-speed photography, technical guarantee is provided the research of individual particle grains of sand orbiting motion.

The purpose of the utility model is to reach through following technical scheme

A kind of grains of sand knocker is made up of long tube, bonnet, back piston, piston bush, back plug, protecgulum, locating sleeve, secondary piston, spring and register pin.Piston bush is housed in the long tube, and piston bush is equipped with secondary piston and back piston, between secondary piston and locating sleeve spring is housed, and locating sleeve and secondary piston axis are provided with center pit, and the protecgulum lock ring of perforate is in long tube; Be provided with spring, bonnet lock ring long tube between back piston and back plug; Long tube one side has notch, and the pulling plug that is cemented on the back piston places notch; The shrinkage pool of the opening of long tube and back piston bottom is relative, and register pin inserts in the shrinkage pool, and long tube is located on the bearing.

The characteristics of the utility model and the beneficial effect of generation are:

1, the utility model adopts the microprocess of high-speed photography and the theoretical method research dust storm motion that combines; Analyze the different-grain diameter particle under the percussive action of power; The take off angle of particle; Movement locus carries out data parsing, and its research for individual particle grains of sand orbiting motion provides image data, for carrying out dust storm particle saltation theory research technique is provided.

2, the utility model is simple in structure, and is easy to loading and unloading.Can be used for 0.25mm～1.00mm dust storm movement of particles test,

Description of drawings

Fig. 1 is the utility model synoptic diagram.

Embodiment

As shown in Figure 1, a kind of grains of sand knocker is made up of long tube 1, bonnet 4, back piston 2, piston bush 3, back plug 5, protecgulum 6, locating sleeve 7, secondary piston 8, spring 9 and register pin 16.Piston bush 3 is housed in the long tube 1, and piston bush 3 is equipped with secondary piston 8 and back piston 2, and 7 of secondary piston 8 and locating sleeves are equipped with spring 9, and locating sleeve 7 is provided with center pit 10 with secondary piston 8 axis, and protecgulum 6 lock rings of perforate are in long tube 1;

Back piston

2 and 5 of back plugs are provided with spring 14, bonnet 4 lock ring long tubes 1; Long tube 1 one sides have notch 11, and the pulling plug 12 that is cemented on the back piston 2 places notch 11; The shrinkage pool 13 of the opening of long tube 1 and back piston 2 bottoms is relative, and register pin 16 inserts in the shrinkage pool 13, and long tube 1 is located on the bearing 15.

Unload the protecgulum 6 of perforate, secondary piston 8 and the center pit 10 of the locating sleeve 7 0.25mm sand grain of packing into refills protecgulum 6, and tightens with long tube 1.

Set high-speed camera, take out the register pin 16 in the shrinkage pool 13 then, under the effect of spring 14; Back piston 2 bump secondary pistons 8 penetrate the center pit 10 0.25mm sand grain of packing into, spur pulling plug 12 then and behind notch 11, move; Compression spring 14; When back piston 2 bottoms have shrinkage pool relative with long tube 1 opening, register pin 16 inserts in the shrinkage pool 13, continues the test of next round dust storm particle saltation.

Can see from the image of high-speed photography: when 8 moments of back piston 2 bump secondary pistons, the 0.25mm sand grain in the center pit 10 vibrates at first, when starting; Vibration is strengthened; Going out center pit 10 in a flash, upwards take-off suddenly, the movement locus of the grains of sand in air-flow has special parabolic shape; The grains of sand can be with the take-off that makes progress of various angles, and take off angle is 30 °～50 °.When the grains of sand fall, to impact with ground, this impact can be regarded elastic collision as.

Claims

1. grains of sand knocker; Form by long tube (1), bonnet (4), back piston (2), piston bush (3), back plug (5), protecgulum (6), locating sleeve (7), secondary piston (8), spring (9) and register pin (16); It is characterized in that being equipped with in the long tube (1) piston bush (3), piston bush (3) is equipped with secondary piston (8) and back piston (2), between secondary piston (8) and locating sleeve (7) spring (9) is housed; Locating sleeve (7) and secondary piston (8) axis are provided with center pit (10), and the protecgulum of perforate (6) lock ring is in long tube (1); Be provided with spring (14), bonnet (4) lock ring long tube (1) between back piston (2) and back plug (5); Long tube (1) one side has notch (11), and the pulling plug (12) that is cemented on the back piston (2) places notch (11); The shrinkage pool (13) of the opening of long tube (1) and back piston (2) bottom is relative, and register pin (16) inserts in the shrinkage pool (13), and long tube (1) is located on the bearing (15).