Random sampling device special for statistics

Abstract

The utility model discloses a special random sample extraction device for statistics, which relates to the technical field of sample extraction and comprises a base, a control module is arranged on the front side of the base, and a five-way connector is arranged at the upper end of the base. By adopting the structure, when a sample ball filled with a sample bag needs to be randomly extracted, the output end of the electric push rod at the column moving through hole stretches out and draws back to drive the L-shaped rod to move downwards, so that the suction head on the L-shaped rod extends into the accommodating box through the extraction hole; then the samples in the containing box are blown up by wind under the operation action of the air blower, meanwhile, the input end of the exhaust fan operates to enable the connected suction head to generate negative pressure suction force, the sample balls blown up in the containing box can be conveniently sucked out, the output end is electrically pushed to be upwards pushed after suction, and the sample balls which are randomly drawn and filled with sample bags can be conveniently taken out; therefore, light sample bags can be conveniently and randomly extracted.

Description

Technical Field

[0001] The utility model belongs to the technical field of sample extraction, and particularly relates to a random sample extraction device dedicated to statistics. Background Art

[0002] Statistics is a science about understanding the quantitative characteristics and quantitative relationships of objective phenomena. It is a methodological science that collects, organizes and analyzes statistical data to understand the quantitative regularity of objective phenomena. Since the quantitative research of statistics is objective, accurate and verifiable, the random sampling method is a sampling survey that is completely based on the principle of equal opportunity, in which each part of the survey object has an equal chance of being selected. It is called "equal probability". There are four basic forms of random sampling, namely simple random sampling, equidistant sampling, type sampling and cluster sampling.

[0003] A Chinese patent with publication number CN217932815U discloses a random sampling device for statistics, including a base frame, the upper end of the base frame is rotatably connected to two rollers, the surfaces of the two rollers are sleeved with conveyor belts, the lower inner wall of the base frame is fixedly connected to two top wheels, both of the top wheels are in contact with the conveyor belt, the surface of the base frame is movably hinged with a cover box, three heating tubes are installed inside the cover box, the side end of the base frame is fixedly connected to a fixed block, the side end of the base frame is fixedly connected to a placement box, a pushing mechanism for extracting samples is arranged on the upper side of the fixed block, and a driving mechanism that can drive the conveyor belt for transmission is arranged inside the base frame, the setting of the driving mechanism drives one of the rollers to rotate, and when one roller rotates, the other roller is driven to rotate through the conveyor belt.

[0004] Through the above-mentioned prior art, it can be understood that although the current statistical random sampling device in the prior art can basically meet the needs of random sampling, it is relatively suitable for samples with large volume and heavy mass, and is not suitable for random sampling of some small volume and light mass sample bags, and is not suitable for carrying and use in on-site statistical teaching. Utility Model Content

[0005] In view of the problems mentioned in the background technology, the purpose of the present invention is to provide a random sampling device for statistics to solve the problems mentioned in the background technology.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] A random sampling device for statistics comprises a base, a control module is arranged on the front of the base, a five-way joint is arranged on the upper end of the base, a blower is arranged on the upper end of the base, the output end of the blower and the joint at the right end of the five-way joint are fixedly installed, a containing box is fixedly connected to the upper end of the five-way joint, a box cover is arranged on the front of the containing box, an extraction hole is opened on the upper end of the containing box, an extraction mechanism is arranged on the upper end of the base, a conduit is arranged on the back of the containing box, a collection box is plugged into the upper end of the base, the box mouth of the collection box is arranged directly below the conduit, and handles are symmetrically arranged on the outer side of the base.

[0008] The cam is provided with a screw rod, and the outer end of the screw rod is threadably connected to a moving column, and the lower end of the moving column is slidably connected to the inner side of the base frame, and a through hole is provided on the inner side of the through hole, and an electric push rod is provided on the inner side of the through hole, and the output end of the electric push rod and the lower end of the L-shaped rod are fixedly installed, and an exhaust fan is provided on the upper end of the L-shaped rod, and a suction head is fixedly installed on the input end of the suction fan, and a sample ball is provided on the inner side of the lower end of the suction head, and a sample bag is provided on the inner side of the sample ball.

[0009] As a preferred technical solution, a sliding rod is symmetrically arranged on the inner side of the upper end of the base frame, the lower end of the shift column is slidably connected to the outer side of the sliding rod, and a sliding groove is symmetrically opened on the inner side of the through hole, and the lower end of the L-shaped rod is slidably connected to the inner side of the sliding groove. The sliding rod can facilitate the sliding of the shift column on the base frame, and the sliding groove can facilitate the sliding of the lower end of the L-shaped rod in the through hole.

[0010] As a preferred technical solution, the suction head is arranged directly above the extraction hole, the upper end of the catheter is fixedly connected to a collecting bucket, the bucket mouth of the collecting bucket is arranged on the side of the suction head, the sample ball includes a first spherical shell and a second spherical shell, the first spherical shell and the second spherical shell are threadedly installed, and the sample bag is arranged between the first spherical shell and the second spherical shell. The extracted sample ball can be conveniently collected through the collecting bucket.

[0011] As a preferred technical solution, a connecting block is symmetrically fixedly connected to the outer side of the conduit, the other end of the connecting block is fixedly installed to the back side of the receiving box, a positioning frame is provided at the upper end of the base, and the collecting box is plugged into the inner side of the positioning frame. The connecting block can facilitate the installation of the conduit and the receiving box, and the positioning frame can facilitate the positioning of the collecting box.

[0012] In summary, the utility model mainly has the following beneficial effects:

[0013] First, when it is necessary to randomly extract the sample ball containing the sample bag, it is only necessary to use the output end of the electric push rod at the displacement column through hole to drive the L-shaped rod to move downward, so that the suction head on the L-shaped rod can extend into the receiving box through the extraction hole, and then the sample in the receiving box is blown up by the operation of the blower. At the same time, the operation of the input end of the exhaust fan causes the connected suction head to generate negative pressure suction, which can conveniently suck out the blown sample ball in the receiving box. After sucking out, the electric push output end is pushed upward, which can conveniently take out the randomly extracted sample ball containing the sample bag, thereby facilitating the random extraction of lightweight sample bags.

[0014] Second, when the sample ball is sucked by the suction head and is outside the containing box, the output end of the driving motor drives the screw to rotate on the base frame, and the shifting column threaded on the outer side of the screw slides backward and laterally. When the suction head moves to the top of the collecting bucket of the duct, the exhaust fan stops running. At this time, the negative pressure suction disappears, and the sample ball enters the duct through the collecting bucket and falls into the collecting box, so that the sample balls in the sample bag can be automatically and randomly extracted and collected.

[0015] Third, the base of the random sampling device is equipped with a handle, which is easy to carry and convenient for use in statistics teaching sites. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 It is a schematic diagram of the back structure of the utility model.

[0018] Figure 3 The utility model Figure 2 Enlarged view of point A in the middle.

[0019] Figure 4 This is an exploded view of the sample ball of the utility model.

[0020] Figure numerals: 1. base, 2. extraction mechanism, 201. base frame, 202. drive motor, 203. screw, 204. shift column, 205. electric push rod, 206. through hole, 207. L-shaped rod, 208. exhaust fan, 209. suction head, 3. storage box, 4. box cover, 5. extraction hole, 6. blower, 7. five-way joint, 8. handle, 9. sample ball, 901. first ball shell, 902. sample bag, 903. second ball shell, 10. control module, 11. collection box, 12. conduit, 13. slide groove, 14. connecting block, 15. collection bucket, 16. positioning frame, 17. slide rod. DETAILED DESCRIPTION

[0021] refer to Figures 1 to 4 The present embodiment of the present invention provides a random sampling device for statistics, comprising a base 1, a control module 10 is arranged on the front of the base 1, a five-way joint 7 is arranged on the upper end of the base 1, a blower 6 is arranged on the upper end of the base 1, the output end of the blower 6 and the joint at the right end of the five-way joint 7 are fixedly installed, a receiving box 3 is fixedly connected to the upper end of the five-way joint 7, a box cover 4 is arranged on the front of the receiving box 3, an extraction hole 5 is opened on the upper end of the receiving box 3, an extraction mechanism 2 is arranged on the upper end of the base 1, a conduit 12 is arranged on the back of the receiving box 3, a collection box 11 is plugged on the upper end of the base 1, the box opening of the collection box 11 is arranged just below the conduit 12, and a handle 8 is symmetrically arranged on the outer side of the base 1; the control module 10 is respectively connected to the drive motor 202 and the electric push rod 205 through wires. , the exhaust fan 208 is electrically connected to the blower 6, and the wind force of the blower 6 can be adjusted to ensure that the blower 6 blows up the sample ball 9 in the receiving box 3 through the five-way joint 7. Except for the joint connected to the output end of the blower 6, the five-way joint 7 and the joints are all arranged in the receiving box 3, which can facilitate blowing the sample ball 9 in the receiving box 3; when extracting, the suction head 209 is inserted into the receiving box 3, and the sample ball 9 will not fly out through the extraction hole 5; the blower 6 blows air in the container box, which can further disrupt the sample ball 9 to ensure randomness. The sample balls 9 in the receiving box 3 can be set to several; the spherical shell of the sample ball 9 is light in weight, and after being loaded into the sample bag 902, it can still be blown up by the wind force of the blower 6; the suction force of the suction nozzle is concentrated and the sample ball 9 can be sucked at the moment the suction nozzle touches it.

[0022] The extraction mechanism 2 includes a base frame 201, which is fixedly mounted on the upper end of the base 1. The inner side of the base frame 201 is rotatably connected to a screw rod 203. A driving motor 202 is arranged on the back of the base frame 201. One end of the screw rod 203 is rotatably installed through the wall of the base frame 201 and the output end of the driving motor 202. The outer side of the screw rod 203 is threadedly connected to a shift column 204. The lower end of the shift column 204 is slidably connected to the inner side of the base frame 201. A through hole 206 is provided on the inner side of the through hole 206, and an electric push rod 205 is provided on the inner side of the through hole 206. An L-shaped rod 207 is slidably connected to the inner side of the upper end of the shift column 204, and the lower end of the L-shaped rod 207 is slidably connected to the inner side of the through hole 206. The output end of the electric push rod 205 and the lower end of the L-shaped rod 207 are fixedly installed, and an exhaust fan 208 is provided on the upper end of the L-shaped rod 207. A suction head 209 is fixedly installed on the input end of the exhaust fan 208. A sample ball 9 is provided on the inner side of the lower end of the suction head 209, and a sample bag 902 is provided on the inner side of the sample ball 9. When it is necessary to randomly extract the sample ball 9 containing the sample bag 902, it is only necessary to use the output end of the electric push rod 205 at the through hole 206 of the shift column 204 to drive the L-shaped rod 207 to move downward, so that the suction head 209 on the L-shaped rod 207 can extend into the receiving box 3 through the extraction hole 5, and then the sample in the receiving box 3 is blown up by the operation of the blower 6. At the same time, the operation of the input end of the exhaust fan 208 causes the connected suction head 209 to generate negative pressure suction, which can conveniently suck out the blown sample ball 9 in the receiving box 3. After sucking out, the electric driving output end is pushed upward, so that the randomly extracted sample ball 9 containing the sample bag 902 can be conveniently taken out; the receiving box 3 is made of transparent material, which is convenient for observation; after the suction head 209 sucks the sample ball 9, the blower 6 stops running.

[0023] refer to Figure 2 and Figure 3 A sliding rod 17 is symmetrically arranged on the inner side of the upper end of the base frame 201, and the lower end of the shift column 204 is slidably connected to the outer side of the sliding rod 17. A sliding groove 13 is symmetrically opened on the inner side of the through hole 206, and the lower end of the L-shaped rod 207 is slidably connected to the inner side of the sliding groove 13. By sliding the shift column 204 at the sliding rod 17 on the base frame 201, the stability of the shift column 204 can be guaranteed, and by sliding the lower end of the L-shaped rod 207 in the sliding groove 13 at the through hole 206, the stability of the L-shaped rod 207 moving on the shift column 204 can be guaranteed.

[0024] refer to Figure 2 and Figure 4The suction head 209 is arranged just above the extraction hole 5, the upper end of the conduit 12 is fixedly connected with the collecting bucket 15, the bucket mouth of the collecting bucket 15 is arranged on the side of the suction head 209, the sample ball 9 includes a first ball shell 901 and a second ball shell 903, the first ball shell 901 and the second ball shell 903 are threadedly installed, the sample bag 902 is arranged between the first ball shell 901 and the second ball shell 903, the suction head 209 is just above the extraction hole 5, and can be conveniently extended into the containing box 3 to absorb the sample ball 9, and the sample ball 9 is threadedly installed through the two first ball shells 901 and the second ball shell 903, so that the sample bag 902 can be easily loaded.

[0025] refer to Figure 2 The outer side of the conduit 12 is symmetrically fixedly connected with a connecting block 14, and the other end of the connecting block 14 is fixedly installed with the back of the receiving box 3. A positioning frame 16 is provided at the upper end of the base 1, and the collecting box 11 is plugged into the inner side of the positioning frame 16. The connecting block 14 can facilitate the installation of the conduit 12 and the receiving box 3, and the positioning frame 16 can be used to insert the collecting box 11 to facilitate its positioning at the lower end of the conduit 12.

[0026] Principle and advantages of use: During use, first load the sample bag 902 into the sample ball 9, and then place several sample balls 9 in the receiving box 3. When it is necessary to randomly extract the sample ball 9 containing the sample bag 902, it is only necessary to use the output end of the electric push rod 205 at the through hole 206 of the shift column 204 to drive the L-shaped rod 207 to move downward, so that the suction head 209 on the L-shaped rod 207 can extend into the receiving box 3 through the extraction hole 5, and then the sample in the receiving box 3 is blown up by the operation of the blower 6. At the same time, the operation of the input end of the exhaust fan 208 makes the connected suction head 209 generate negative pressure suction, which can conveniently suck out the blown sample ball 9 in the receiving box 3. After sucking out, the electric push output end is pushed upward, so that the randomly extracted sample ball 9 containing the sample bag 902 can be conveniently taken out.

[0027] When the sample ball 9 is sucked by the suction head 209 and the sample ball 9 is outside the containing box 3, the output end of the driving motor 202 drives the screw rod 203 to rotate on the base frame 201, and the shift column 204 threadedly connected to the outer side of the screw rod 203 slides backward and laterally. When the suction head 209 moves to the top of the collecting bucket 15 of the duct 12, the exhaust fan 208 stops running. At this time, the negative pressure suction disappears, and the sample ball 9 enters the duct 12 through the collecting bucket 15 and falls into the collecting box 11 to be automatically collected.

Claims

1. A random sampling device for statistics, comprising a base (1), characterized in that: A control module (10) is arranged on the front of the base (1), a five-way joint (7) is arranged on the upper end of the base (1), a blower (6) is arranged on the upper end of the base (1), the output end of the blower (6) and the joint at the right end of the five-way joint (7) are fixedly installed, the upper end of the five-way joint (7) is fixedly connected with a storage box (3), a box cover (4) is arranged on the front of the storage box (3), an extraction hole (5) is opened on the upper end of the storage box (3), an extraction mechanism (2) is arranged on the upper end of the base (1), a guide tube (12) is arranged on the back of the storage box (3), a collection box (11) is plugged on the upper end of the base (1), the box opening of the collection box (11) is arranged directly below the guide tube (12), and a handle (8) is symmetrically arranged on the outer side of the base (1); The extraction mechanism (2) comprises a base frame (201), the base frame (201) is fixedly mounted on the upper end of the base (1), the inner side of the base frame (201) is rotatably connected with a screw rod (203), the back side of the base frame (201) is provided with a driving motor (202), one end of the screw rod (203) is rotatably penetrates through the frame wall of the base frame (201) and the output end of the driving motor (202) is fixedly mounted, the outer side of the screw rod (203) is threadedly connected with a shift column (204), the lower end of the shift column (204) is slidably connected to the inner side of the base frame (201), and the inner side of the shift column (204) is provided with a through hole (206) An electric push rod (205) is arranged on the inner side of the through hole (206); an L-shaped rod (207) is slidably connected to the inner side of the upper end of the shift column (204); the lower end of the L-shaped rod (207) is slidably connected to the inner side of the through hole (206); the output end of the electric push rod (205) and the lower end of the L-shaped rod (207) are fixedly installed; an exhaust fan (208) is arranged on the upper end of the L-shaped rod (207); a suction head (209) is fixedly installed on the input end of the exhaust fan (208); a sample ball (9) is arranged on the inner side of the lower end of the suction head (209); a sample bag (902) is arranged on the inner side of the sample ball (9).

2. The random sampling device for statistics according to claim 1, characterized in that: A sliding rod (17) is symmetrically arranged on the inner side of the upper end of the base frame (201), and the lower end of the shift column (204) is slidably connected to the outer side of the sliding rod (17).

3. The random sampling device for statistics according to claim 1, characterized in that: A sliding groove (13) is symmetrically provided on the inner side of the through hole (206), and the lower end of the L-shaped rod (207) is slidably connected to the inner side of the sliding groove (13).

4. The random sampling device for statistics according to claim 1, characterized in that: The suction head (209) is arranged directly above the extraction hole (5); the upper end of the conduit (12) is fixedly connected to a collecting bucket (15); and the mouth of the collecting bucket (15) is arranged on the side of the suction head (209).

5. The random sampling device for statistics according to claim 1, characterized in that: A connection block (14) is symmetrically and fixedly connected to the outer side of the conduit (12), and the other end of the connection block (14) is fixedly mounted to the back side of the containing box (3).

6. The random sampling device for statistics according to claim 1, characterized in that: A positioning frame (16) is provided at the upper end of the base (1), and the collection box (11) is plugged into the inner side of the positioning frame (16).

7. The random sampling device for statistics according to claim 1, characterized in that: The sample ball (9) comprises a first spherical shell (901) and a second spherical shell (903).

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