AU2021101238A4 - Dust Fall Sampling Device for Arid and Semi-Arid Areas - Google Patents

Abstract

The present disclosure relates to a dust fall sampling device for arid and semi-arid areas. The dust fall sampling device includes a fixed support, a dust fall bucket mounted on the fixed 5 support, and a friendly bird dropping-proof device mounted on the dust fall bucket. The bottom end of the friendly bird dropping-proof device is fixedly connected to the top end of the dust fall bucket. A first filter screen and a second filter screen are arranged in the dust fall bucket. The first filter screen is located above the second filter screen. The dust fall sampling device for arid and semi-arid areas have the advantages of simple structure, convenience in sampling, and the 10 like, is suitable for scientific research and atmospheric dust monitoring under various conditions in arid and semi-arid areas. Through reasonable arrangement, the present disclosure not only provides birds with a standing and resting place, but also prevents bird droppings from being discharged into the dust fall bucket. Insects and residual bodies of larger plants are filtered by using double layers of filter screens, which improves the purity of collected dust fall substances, 15 and meanwhile, has the functions of reducing eddy current and avoiding secondary dusting, thereby inhibiting the escape of the dust fall substances, and improving the collection efficiency and purity of dust fall. 1/3 DRAWINGS 1 2 31 441 4 45 43 4 4 FIG. 2 13 FIG. 2

Description

1/3 DRAWINGS

1

2 31 441

4

45 43

44

FIG. 2

13 FIG. 2

DUST FALL SAMPLING DEVICE FOR ARID AND SEMI-ARID AREAS

TECHNICAL FIELD The present disclosure relates to an atmospheric dust fall sampling device applied to scientific research or environmental monitoring under natural conditions, and in particular, to a dust fall sampling device for arid and semi-arid areas.

BACKGROUND Collecting atmospheric dust fall and aeolian sand materials by using a dust fall bucket is a basic means to carry out atmospheric scientific research and environmental quality detection, and it is also the basis for analyzing and researching the particle size, mineral composition, and source of dust fall substances. However, the current dust fall sampling device mainly faces two problems: (1) due to the lack of protective measures, there are often bird droppings mixed into dust fall samples, and meanwhile, there are impurities, such as leaves and insects, fall into the dust fall samples, which will cause certain impact on dust fall flux and material composition; (2) due to local turbulence formed in the dust fall bucket by air flow, secondary dusting in the dust fall bucket is formed, which leads to the escape of the collected dust fall substances, the collection efficiency is reduced, and meanwhile, the accuracy of results cannot be guaranteed.

SUMMARY The technical solution of the present disclosure for solving the above technical problems is as follows: A dust fall sampling device for arid and semi-arid areas includes a fixed support, a dust fall bucket mounted on the fixed support, and a friendly bird dropping-proof device mounted on the dust fall bucket. The bottom end of the friendly bird dropping-proof device is fixedly connected to the top end of the dust fall bucket. The collected sample enters the dust fall bucket through the friendly bird dropping-proof device. Two layers of filter screens, respectively a first filter screen and a second filter screen, are arranged in the dust fall bucket. The first filter screen is located above the second filter screen.

The present disclosure has the following beneficial effects: The friendly bird dropping-proof device is adopted without arranging the structures, such as needles and clips, which avoids injuring birds and can prevent bird droppings from falling into the dust fall bucket. The dust fall bucket is used for collecting samples, double layers of filter screens are arranged in the dust fall bucket, and insects and residual bodies of larger plants are filtered by using the double layers of filter screens, which improves the purity of the collected dust fall substances; meanwhile, the filter screens can also achieve a secondary interception effect in case the bird droppings fall into the dust fall bucket. On the basis of the technical solution above, the present disclosure can also make the following improvements. Further, the top of the friendly bird dropping-proof device is circular; the top diameter of the friendly bird dropping-proof device is greater than the top diameter of the dust fall bucket; the diameter difference between the top of the friendly bird dropping-proof device and the top of the dust fall bucket is 22 to 32 cm. Further, the distance between the top end of the friendly bird dropping-proof device and the top end of the dust fall bucket in the vertical direction is 5 to 8 cm. The beneficial effect achieved by adopting the above solution is that: The friendly bird dropping-proof device is arranged at the top end of the dust fall bucket, which provides the birds with a standing and resting point above a dust-proof jar, and also prevents the bird droppings from falling into the dust fall bucket. Even if part of the bird droppings fall into the dust fall bucket, the double layers of filter screens in the dust fall bucket can also intercept most of them. Further, both the first filter screen and the second filter screen are arranged horizontally, and the distance between the first filter screen and the second filter screen is 3 to 8 cm. Further, the distance between the first filter screen and the bottom of the dust fall bucket is 10 to 20 cm; the distance between the second filter screen and the bottom of the dust fall bucket is 7 to 12 cm. By reasonably setting the parameters, such as the placement height of the filter screens, after rainfall, impurities intercepted by the filter screens and dust fall substances are prevented from soaking and mixing to affect the accuracy of analysis of particle sizes, mineral compositions, and the like; meanwhile, the device also has the functions of reducing eddy current and avoiding secondary dusting, thereby inhibiting the escape of the dust fall substances, and improving the collection efficiency and purity of dust fall. Further, the aperture of the first filter screen is greater than that of the second filter screen; the aperture of the first filter screen is 2 to 5 mm; the aperture of the second filter screen is 1 to 4 mm. The beneficial effects achieved by adopting the further solution above are that: When double layers of energy dissipating and impurity preventing filter screens are arranged in the dust fall bucket by the inventor, the aperture of the first filter screen is greater than that of the second filter screen, which facilitates the improvement of the filter effect.

Through further research, it is found unexpectedly that when the aperture of the first filter screen is 2 to 5 mm and the aperture of the second filter screen is 1 to 4 mm, most impurities are filtered through double-layer filtration, which has the advantages of good filtering effect and the like. Further, the top of the friendly bird dropping-proof device is a bird standing circle; the bottom of the friendly bird dropping-proof device is a first base fixed to the top end of the dust fall bucket; the first base is of a circular structure; the first base is in threaded connection with the dust fall bucket; the bird standing circle is connected to the first base through a connecting part; the inside diameter of the bird standing circle is 42 to 52 cm. The beneficial effects achieved by adopting the further solution above are that: The inside diameter of the bird standing circle is set reasonably, which facilitates the standing of the birds and prevents droppings from falling into the dust fall bucket. Further, bulges used for placing the first filter screen and the second filter screen are formed on the inner wall of the dust fall bucket. Further, both the first filter screen and the second filter screen are provided with handles. The handles are respectively and rotatably connected to the first filter screen and the second filter screen. The beneficial effects achieved by adopting the further solution above are that: when the dust fall sampling device is used and the handles are located in a vertical state, it is convenient to take out the filter screens from the dust fall bucket or put the filter screens into the dust fall bucket; the handles can be rotated to be level with the filter screens by placing the filter screens into the dust fall bucket, which prevents the collection of the samples from being affected. Further, the fixed support includes a dust fall bucket placement frame, a support rod, a second base, and pull ropes; the top of the dust fall bucket placement frame is open, the side wall thereof is a hollow frame, and the bottom thereof is of a solid structure; the dust fall bucket is placed in the dust fall bucket placement frame; the top end of the dust fall bucket extends out of the dust fall bucket placement frame; the support rod is arranged vertically; the top end of the support rod is fixedly connected to the bottom of the dust fall bucket placement frame; the bottom end of the support rod is fixedly connected to the second base; the second base is fixedly connected to the ground; one end of the pull rope is fixedly connected to the support rod; the other end of the pull rope is fixedly connected to the ground through a ground fixing clamp; three pull ropes are arranged; the three pull ropes uniformly surround the support rod to form a pyramid structure with the ground.

The beneficial effects achieved by adopting the further solution above are that: the dust fall bucket placement frame located at the top of the fixed support is used for placing the dust fall bucket. The fixed support can be more stable by reasonably arranging the three pull ropes and the support rod. Further, the height between the top end of the dust fall bucket and the ground is 200 cm. The beneficial effects achieved by adopting the further solution above are that: the requirements of conventional dust fall monitoring are met; during sampling, the dust fall sampling device can be placed at the conventional monitoring height of 200 cm by using the fixed support, and can also be fixed at different heights by means of other fixtures. The dust fall sampling and placement are flexible, so it is suitable for scientific research and atmospheric dust fall monitoring under various conditions in arid and semi-arid areas. Further, the pull ropes are plastic coated steel wire ropes, and other parts, except the pull ropes, are made of a stainless steel material.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic structural diagram of a dust fall sampling device for arid and semi-arid areas of the present disclosure; FIG. 2 is a schematic diagram of a three-dimensional structure of a friendly bird dropping-proof device of the present disclosure; FIG. 3 is a schematic diagram of a three-dimensional structure of a dust fall bucket of the present disclosure(without a filter screen); FIG. 4 is a schematic diagram of a three-dimensional structure of a filter screen of the present disclosure; FIG. 5 is a schematic diagram of a three-dimensional structure of a fixed support of the present disclosure. In the drawings, the list of parts represented by various numerals is as follows: 1-friendly bird dropping-proof device, 11-bird standing circle; 12-connecting part; 13-first base; 2-dust fall bucket; 21-bulge; 3-filter screen; 31-first filter screen; 32-second filter screen; 4-fixed support; 41-dust fall bucket placement frame; 42-pull rope; 43- ground fixing clamp; 44-second base; 45-support rod; 5-handle.

DETAILED DESCRIPTION The following describes the principles and features of the present disclosure in combination with accompanying drawings. The embodiments cited are only used for explaining the present disclosure and are not intended to limit the scope of the present disclosure.

As shown in FIGs. 1 to 5, the top of the friendly bird dropping-proof device 1 is circular; the axis of the friendly bird dropping-proof device 1and the axis of the dust fall bucket 2 are on the same line. The top diameter of the friendly bird dropping-proof device 1 is greater than the top diameter of the dust fall bucket 2. The diameter difference between the top of the friendly bird dropping-proof device 1 and the top of the dust fall bucket is 22 to 32 cm. Both the first filter screen 31 and the second filter screen 32 are arranged horizontally. Bulges 21 used for placing the first filter screen 31 and the second filter screen 32 are formed on the inner wall of the dust fall bucket 2. Both the first filter screen 31 and the second filter screen 32 are provided with handles 5. The handles 5 are respectively and rotatably connected to the first filter screen 31 and the second filter screen 32. The height between the top end of the dust fall bucket 2 and the ground is 200 cm. The friendly bird dropping-proof device 1, the dust fall bucket, the first filter screen 31, the second filter screen 32, and ground fixing clamps 43 are all made of reinforcing steel bars. The pull ropes 42 are plastic coated steel wire ropes. Other parts, except the pull ropes, are made of a stainless steel material. The following introduces through some specific embodiments. As shown in FIG. 1, a dust fall sampling device capable of reducing eddy current and preventing impurities for arid and semi-arid areas consists of a friendly bird dropping-proof device 1, a dust fall bucket 2, filter screens 3, and a fixed support 4. The friendly bird dropping-proof device 1 is fixed to the upper end of the dust fall bucket 2. Two filter screens 3, respectively a first filter screen 31 and a second filter screen 32, are arranged in the dust fall bucket 2. The dust fall bucket 2 is placed on the fixed support 4. As shown in FIG. 2, the friendly bird dropping-proof device 1 consists of a first base 13 fixed to the dust fall bucket 2, a connecting part 12, and a bird standing circle 11 arranged at the top of the connecting part 12. The first base 13 is of a circular structure. The first base 13 has the inside diameter of 20.5 cm and the width of 2 cm, and is made of a stainless steel material; the thickness of the material is 0.6 cm. Holes are formed in the two ends corresponding to the middle of the side wall of the first base 13, and the aperture is 8 mm. Holes are formed in corresponding positions on the side wall of the upper edge of the dust fall bucket 2, and the aperture is 8 mm. Finally, the friendly bird dropping-proof device 1 is fixed to the dust fall bucket 2 by using screws of appropriate sizes. The bird standing circle 11 located at the top of the friendly bird dropping-proof device 1 is made of reinforcing stainless steel bars with the diameter of 10 mm. The top diameter of the friendly bird dropping-proof device 1 is greater than the top diameter of the dust fall bucket 2. The diameter difference between the top of the friendly bird dropping-proof device 1and the top of the dust fall bucket 2 is 22 to 32 cm, that is to say, the inside diameter of the bird standing circle 11is 42 to 52 cm. The top end of the bird standing circle 11 is 5 to 8 cm higher than the top end of the dust fall bucket 2. The connecting part 12 includes three reinforcing stainless steel bars with the diameter of 10 mm. One end of the reinforcing stainless steel bar is welded with the bird standing circle 11, and the other end of the reinforcing stainless steel bar is welded with the first base 13. The welding points are located at trisections of the first base, that is to say, there is a welding point at every 120. As shown in FIG. 3, the dust fall bucket 2 is a stainless steel bucket with the inside diameter of 20 cm, the outside diameter of 20.4 cm, and the height of 40 cm. Three stainless steel pieces with the width of 0.5 cm, the thickness of 0.2 cm, and the length of 0.5 cm are respectively welded at 10 to 20 cm and 7 to 12 cm from the bottom in the stainless steel dust bucket 2. The stainless steel pieces form bulges 21 relative to the inner wall of the dust fall bucket 2. The welding positions are at trisections at the height of 10 to 20 cm and 7 to 12 cm, and that is to say, there is a welding point at every 120°. The welding positions are used for placing the filter screens 3. Two filter screens 3, respectively a first filter screen 31 and a second filter screen 32, are arranged in the dust fall bucket 2. Both the first filter screen 31 and the second filter screen 32 are arranged horizontally. The first filter screen 31 is located above the second filter screen 32. Both the first filter screen 31 and the second filter screen 32 are of network structures made of the stainless steel material. As shown in FIG. 4, both the first filter screen 31 and the second filter screen 32 are provided with rotatable semicircular handles 5. The handles 5 are connected to the filter screens by using circular key rings with the diameter of 1 cm. When samples are collected, the filter screens are lifted out. During sampling, the handles 5 are put down to be flush with the filter screens. The first filter screen 31 is arranged at 10 to 20 cm from the bottom of the dust fall bucket 2, and the aperture of the first filter screen 31 is 2 to 5 mm. The aperture of the first filter screen 31 is greater than that of the second filter screen 32. The second filter screen 32 is arranged at 7 to 12 cm from the bottom of the dust fall bucket 2, and the aperture of the second filter screen 32 is 1 to 4 mm. As shown in FIG. 5, the fixed support 4 consists of a dust fall bucket placement frame 41, pull ropes 42, ground fixing clamps 43, and a second base 44. The dust fall bucket is placed in the dust fall bucket placement frame 41. The top end of the dust fall bucket 2 extends out of the dust fall bucket placement frame 41. The upper edge of the fixed support 4 is 195 cm above the ground. After the dust fall bucket is placed, the distance between the top end of the dust fall bucket 2 and the ground is 200 cm. The dust fall bucket placement frame 41 is a cylindrical hollow frame with the inside diameter of 21 cm. The depth of the hollow frame is 35 cm. The bottom of the hollow frame is a solid base made of a stainless steel material with the inside diameter of 21 cm, and the thickness of the solid base is 0.4 cm. The top of the hollow frame is a circle with the inside diameter of 21 cm which is made of a reinforcing stainless steel bar with the diameter of 1 cm. The top and the solid base of the hollow frame are connected by reinforcing stainless steel bars with the diameter of 1 cm, which are also connected at trisections, that is to say, the top and the solid base of the hollow frame are welded by connecting points at every 120 °. The support rod 45 includes two parts: a first connecting rod and a second connecting rod. Both the first connecting rod and the second connecting rod are arranged vertically. The first connecting rod is a hollow stainless steel pipe. The bottom end of the hollow stainless steel pipe is connected to the top end of the second connecting rod through a threaded connector. Such arrangement has the advantages of facilitating detaching, and facilitating carrying. The hollow stainless steel pipe has the diameter of 5 cm, and the length of 80 cm. The center of the solid base is welded with the top end of the hollow stainless steel pipe. Three stainless steel lugs are welded at the positions, 10 cm from the solid base, on the side wall of the hollow stainless steel pipe, and are also welded at the trisections. The pull ropes 42 consist of plastic coated steel wire ropes. The steel wire ropes are 0.5 cm thick and 2.5 m long. After the stainless steel lugs on the dust fall bucket and the ground fixing clamps are connected by the steel wires ropes, the connection positions are fixed by using U-shaped clips. Three pull ropes 42 are arranged; the three pull ropes 42 uniformly surround the support rod 45 to form a pyramid structure with the ground. The ground fixing clamp 43 is made of a reinforcing steel bar with the diameter of 1.2 cm. The ground fixing clamp 43 has the length of 50 cm, the bottom is a round tip and the top is a flat head. A hollow hole with the diameter of 0.7 cm is formed in a clamp body 2 cm below the top of the ground fixing clamp 43, and is used for connecting the pull rope 42. The second base 44 is a stainless steel disc bottom surface with the diameter of 40 cm and the thickness of 0.6 cm. The bottom end of the second connecting rod is welded with the second base 44. Three holes are formed in the second base 44 at equal distance, and the aperture is 1 cm. The second base 44 is fixed to the ground by using T-shaped fixing drill rods with the length of 40 cm. When the device is used, an observation place is selected. After the ground is leveled, various parts of the fixed support 4 are assembled and fixed to the ground. The friendly bird dropping-proof device 1, the dust fall bucket 2, and the filter screens 3 in the dust fall bucket 2 are vertically arranged in the dust barrel placing frame 41 of the fixed support 4 in a sleeving manner after being assembled, and the height between the upper edge of the dust fall bucket 2 and the ground is 200 cm. After a period of observation according to the purpose of observation, the dust fall bucket 2 is taken out from the fixed support 4, the friendly bird dropping-proof device 2 at the top is removed, the filter screens 3 in the dust fall bucket are taken out, and all dust in the dust fall bucket 2 is cleaned into bottles or plastic bags prepared in advance with a brush. If the water at the bottom does not evaporate when samples are collected in a rainy season, the inner wall of the dust fall bucket 2 is cleaned with a spout of distilled water, so as to collect all the dust in the dust fall bucket 2. The dust is poured into the bottles and taken back to a laboratory for collecting samples after being dried. The dust fall sampling device for arid and semi-arid areas of the present disclosure is simple in structure, facilitates sampling, provides birds with standing and resting places, can also avoid the impact of animals, such as birds, and residual bodies of large plants, meanwhile, has the functions of reducing eddy current and avoiding secondary dusting, thereby inhibiting the escape of the dust fall substances, and improving the collection efficiency and purity of dust fall. During sampling, the dust fall sampling device can be placed at the conventional monitoring height of 200 cm by using the fixed support, and can also be fixed at different heights by means of other fixtures, so the dust fall sampling and placement are flexible. Embodiment 1 The diameter difference between the top of the friendly bird dropping-proof device 1 and the top of the dust fall bucket is 22 cm. The distance between the top end of the friendly bird dropping-proof device 1and the top end of the dust fall bucket 2 is 5 cm. The distance between the first filter screen 31 and the second filter screen 32 is 8 cm. The distance between the first filter screen 31 and the bottom of the dust fall bucket 2 is 20 cm, and the distance between the second filter screen 32 and the bottom of the dust fall bucket 2 is 12 cm. The aperture of the first filter screen 31 is 2 mm, and the aperture of the second filter screen 32 is 1 mm. The rest structures are the same as the above description. The dust fall collecting time is from mid March to late May, and is 64 days in total. Embodiment 2 The diameter difference between the top of the friendly bird dropping-proof device 1 and the top of the dust fall bucket is 32 cm. The distance between the top end of the friendly bird dropping-proof device 1and the top end of the dust fall bucket 2 is 8 cm. The distance between the first filter screen 31 and the second filter screen 32 is 5 cm. The distance between the first filter screen 31 and the bottom of the dust fall bucket 2 is 12 cm, and the distance between the second filter screen 32 and the bottom of the dust fall bucket 2 is 7 cm. The aperture of the first filter screen 31 is 5 mm, and the aperture of the second filter screen 32 is 4 mm. The rest structures are the same as Embodiment 1. The dust fall collecting time is from mid March to late May, and is 64 days in total. Comparative Embodiment 1: the dust fall bucket with the same specification as that in Embodiment 1 is used for collecting, there is no friendly bird dropping-proof device above the dust fall bucket, and there is no filter screen in the bucket. A glass ball with the diameter of 4 cm is placed at the bottom of the dust fall bucket. This method is a traditional common dry collection method. The dust fall collecting time is from mid March to late May, and is 64 days in total. Comparative Embodiment 2: the dust fall bucket with the same specification as that in Embodiment 1 is used for collecting the dust fall, there is no friendly bird dropping-proof device above the dust fall bucket, and there is no filter screen in the bucket. Distilled water is poured into the bottom of the dust fall bucket, the depth is 5 cm, and the distilled water is added for three times during this period. This method is a traditional common wet collection method. The dust fall collecting time is from mid March to late May, and is 64 days in total. During the experiment, the inventor also tested the dust collection efficiency (relative to the weight of the wet collection method) and the purity (the weight of impurities/the weight of dust fall substances) of the device. Specific results are shown in Table 1. Table 1 Collection Purity/% Notes Efficiency/% Embodiment 1 95.6 99.2 No adhesion and mixing of bird droppings and dust fall substances Embodiment 2 93.7 97.8 No adhesion and mixing of bird droppings and dust fall substances Embodiment 3 94.1 98.1 No adhesion and mixing of bird droppings and dust fall substances Comparative 60.5 90.1 Adhesion and mixing of bird droppings Embodiment 1 and dust fall substances Comparative 100 86.9 Most bird droppings dissolved and could Embodiment 2 not be separated, the dust fall substances smelled and deteriorated, and during this period, water was added three times From the data in Table 1, it can be seen that the collection efficiency and purity of Embodiment 1 to Embodiment 3 are relatively high compared with those of Comparative

Embodiment 1, the collection efficiency can reach 93.7 to 95.6%, and the purity can reach 97.8 to 99.2%. The collection efficiency of Comparative Embodiment 2 is high, but the purity is low (86.9%). From the point of view of whether bird droppings can be prevented, the phenomena of adhesion and mixing of bird droppings and dust fall substances did not appear in Embodiment 1 to Embodiment 3; adhesion and mixing of bird droppings and dust fall substances appeared in Comparative Embodiment 1; the phenomena that most of bird droppings dissolved and could not be separated, and the dust fall substances smelled and deteriorated in Comparative Embodiment 2. Therefore, the present disclosure has the functions of reducing eddy current and avoiding secondary dust through reasonable arrangement, thereby inhibiting the escape of dust fall substances, and improving the collection efficiency and the purity of dust fall. In the study, it was found that the devices in Embodiments 1to 3 not only provided a place for the birds to stand and rest, but also prevented the droppings of the birds from being released into the dust fall bucket.

Claims (5)

1. A dust fall sampling device for arid and semi-arid areas, comprising a fixed support (4), a dust fall bucket (2) mounted on the fixed support (4), and a friendly bird dropping-proof device (1) mounted on the dust fall bucket (2); the bottom end of the friendly bird dropping-proof device (1) is fixedly connected to the top end of the dust fall bucket (2); a collected sample enters the dust fall bucket (2) through the friendly bird dropping-proof device (1); two layers of filter screens (3), respectively a first filter screen (31) and a second filter screen (32), are arranged in the dust fall bucket (2); the first filter screen (31) is located above the second filter screen (32);

the top of the friendly bird dropping-proof device (1) is circular; the top diameter of the friendly bird dropping-proof device (1) is greater than the top diameter of the dust fall bucket (2); the diameter difference is 22 to 32 cm;

the distance between the top end of the friendly bird dropping-proof device (1) and the top end of the dust fall bucket (2) in the vertical direction is 5 to 8 cm.

2. The dust fall sampling device for arid and semi-arid areas according to claim 1, wherein both the first filter screen (31) and the second filter screen (32) are arranged horizontally; the distance therebetween is 3 to 8 cm.

3. The dust fall sampling device for arid and semi-arid areas according to claim 2, wherein the distance between the first filter screen (31) and the bottom of the dust fall bucket (2) is 10 to 20 cm; the distance between the second filter screen (32) and the bottom of the dust fall bucket (2) is 7 to 12 cm.

4. The dust fall sampling device for arid and semi-arid areas according to claim 1, wherein the aperture of the first filter screen (31) is greater than that of the second filter screen (32); the aperture of the first filter screen (31) is 2 to 5 mm; the aperture of the second filter screen (32) is 1 to 4 mm.

5. The dust fall sampling device for arid and semi-arid areas according to any one of claims 1 to 4, wherein the top of the friendly bird dropping-proof device (1) is a bird standing circle (11); the bottom of the friendly bird dropping-proof device (1) is a first base (13) fixed to the top end of the dust fall bucket (2); the first base (13) is a circular structure; the first base (13) is in threaded connection with the dust fall bucket (2); the bird standing circle (11) is connected to the first base (13) through a connecting part (12); the inside diameter of the bird standing circle (11) is 42 to 52 cm; wherein bulges (21) used for placing the first filter screen (31) and the second filter screen (32) are formed on the inner wall of the dust fall bucket (2); both the first filter screen (31) and the second filter screen (32) are provided with handles (5); the handles (5) are respectively and rotatably connected to the first filter screen (31) and the second filter screen (32); wherein the fixed support (4) comprises a dust fall bucket placement frame (41), a support rod (45), a second base (44), and pull ropes (42); the top of the dust fall bucket placement frame (41) is open, the side wall thereof is a hollow frame, and the bottom thereof is of a solid structure; the dust fall bucket (2) is placed in the dust fall bucket placement frame (41); the top end of the dust fall bucket (2) extends out of the dust fall bucket placement frame (41); the support rod (45) is arranged vertically; the top end of the support rod (45) is fixedly connected to the bottom of the dust fall bucket placement frame (41); the bottom end of the support rod (45) is fixedly connected to the second base (44); the second base (44) is fixedly connected to the ground; one end of the pull rope (42) is fixedly connected to the support rod (45), and the other end of the pull rope (42) is fixedly connected to the ground through a ground fixing clamp (43); three pull ropes (42) are arranged; the three pull ropes (42) uniformly surround the support rod (45) to form a pyramid structure with the ground; wherein the height between the top end of the dust fall bucket (2) and the ground is 200 cm; the pull ropes (42) are plastic coated steel wire ropes; other parts, except the pull ropes (42), are made of a stainless steel material.