Random sampling device for statistics

Abstract

The utility model discloses a random sampling device for statistics in the technical field of random sampling devices. The random sampling device comprises a sampling barrel, a stirring rod is rotatably arranged in the sampling barrel, a movable cavity is formed in the bottom of the sampling barrel, the movable cavity is communicated with the inner wall of the sampling barrel, and a piston piece is movably arranged in the movable cavity; the small ball in the sampling barrel is stirred by starting the stirring rod, the convex rod disc is driven to synchronously rotate along with rotation of the stirring rod, the piston piece is driven to move up and down along with rotation of the convex rod disc, when the piston piece moves upwards, air flow in the movable cavity is pushed into the sampling barrel, and then the small ball is blown to move through the sprayed air flow; therefore, the mixing speed of the small balls is higher; when an operator opens the sealing plate, the steel rope and the blocking plate are pulled to move downwards, at the moment, the discharging opening is opened so that the operator can take the small balls, the discharging opening is blocked along with downward movement of the blocking plate, and therefore the possibility that the small balls are continuously discharged out of the discharging opening is reduced.

Description

Technical Field

[0001] This utility model relates to the field of random sampling device technology, and in particular to a random sampling device for statistical purposes. Background Technology

[0002] In statistics, random sampling is an inferential statistical method that selects a portion of individuals from a target population as a sample. By observing one or more attributes of the sample, it makes a relatively reliable estimate of the quantitative characteristics of the population based on the obtained data, thereby achieving an understanding of the population.

[0003] An existing patent (publication number: CN222365286U) discloses a random sampling device for statistics, comprising a first disk with its opening facing upwards and a column. The column is fixedly connected to the bottom of the first disk, and a through hole is formed on the top surface of the first disk. A sphere is placed inside the first disk, and the diameter of the sphere is smaller than the diameter of the through hole. However, this technical solution still has shortcomings, as follows:

[0004] The current device uses only an air pump and nozzle to blow air into the first disc, causing the balls to roll and mix. However, the mixing speed is slow when the balls are mixed solely by airflow. Therefore, we propose a statistical random sampling device to address the aforementioned problem. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of the present invention, to avoid obscuring the purpose of these documents, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] Therefore, the purpose of this invention is to provide a random sampling device for statistics, which can solve the problem that existing devices only use an air pump and nozzle to blow air into the first disc to cause the balls to roll and mix, but the mixing speed is slow when the balls are mixed by airflow alone.

[0007] To solve the above-mentioned technical problems, this utility model provides a random sampling device for statistics, which adopts the following technical solution: It includes a sampling cylinder, an agitator rotatably mounted inside the sampling cylinder, a movable cavity at the bottom of the sampling cylinder communicating with the inner wall of the sampling cylinder, a piston movably mounted inside the movable cavity, the lower end of the agitator inserted into the movable cavity and fixedly fitted with a convex rod disc, the lower end of the convex rod disc slidingly abutting against the top surface of the piston, a discharge port on the side wall of the sampling cylinder, a sealing plate movably inserted into the inner top wall of the discharge port, a sealing plate hinged at the outlet of the discharge port, and the sealing plate connected to the sealing plate by a steel cable.

[0008] By adopting the above technical solution, this solution stirs the small balls in the sampling cylinder by starting the stirring rod, and drives the cam plate to rotate synchronously as the stirring rod rotates. As the cam plate rotates, it causes the piston to move up and down. When the piston moves up, it pushes the airflow in the moving chamber into the sampling cylinder, and then blows the small balls to move by the ejected airflow, thereby increasing the mixing speed of the small balls.

[0009] Optionally, the sampling cylinder has a storage cavity, and a nozzle is fixedly inserted into the inner bottom wall of the storage cavity. The air inlet of the nozzle is connected to the movable cavity.

[0010] By adopting the above technical solution, the sample ball can be stored in the storage cavity. When the piston moves up, it pushes the airflow in the moving cavity into the nozzle, and then the airflow ejected from the nozzle blows the ball to move.

[0011] Optionally, a motor is fixedly installed at the top of the sampling cylinder, the rotating shaft of the motor is fixedly connected to the upper end of the stirring rod, and a number of stirring blades are fixedly installed at one end of the stirring rod inserted into the storage cavity.

[0012] By adopting the above technical solution, this solution uses a motor to easily drive the stirring rod and stirring blade to rotate, and the small balls are easily stirred and mixed as the stirring blade rotates.

[0013] Optionally, the piston component includes a piston disc and a corrugated tube. The piston disc is movably disposed within the movable cavity, and the corrugated tube is fixedly disposed on the top surface of the piston disc. The top surface of the piston disc is connected to the inner top wall of the movable cavity by a plurality of first springs.

[0014] By adopting the above technical solution, this solution uses the first spring to facilitate the upward movement of the piston disc and the corrugated tube, thereby ensuring that the corrugated tube is always in contact with the bottom of the convex rod disc.

[0015] Optionally, the convex rod disc includes a disc and a plurality of round rods. The disc is fixedly sleeved on one end of the stirring rod inserted into the movable cavity. The upper ends of the plurality of round rods are fixedly disposed on the bottom surface of the disc, and the lower ends of the plurality of round rods slide against the top surface of the corrugated tube.

[0016] By adopting the above technical solution, when the stirring rod rotates, it drives the disc and the rod to rotate synchronously. Then the rod slides along the upper end of the corrugated tube, thereby causing the corrugated tube to drive the piston disc to move up and down.

[0017] Optionally, the discharge port is connected to the storage cavity, and a vertical groove is formed on the inner top wall of the discharge port.

[0018] By adopting the above technical solution, this solution facilitates the installation of the sealing plate through the vertical groove and facilitates the discharge of small balls through the discharge port.

[0019] Optionally, the sealing plate is L-shaped, the sealing plate is movably disposed in the vertical groove, and the upper end of the sealing plate is connected to the inner top wall of the vertical groove by a second spring.

[0020] By adopting the above technical solution, this solution uses a second spring to easily pull the sealing plate up and store it in the vertical groove, thereby enabling a single ball to enter the discharge port.

[0021] Optionally, a handle is fixedly provided on the side wall of the sealing plate, one end of the steel cable is fixedly connected to the side of the sealing plate facing the discharge port, and the other end of the steel cable is inserted into the vertical groove and fixedly connected to the top of the sealing plate.

[0022] By adopting the above technical solution, the operator can easily pull the sealing plate open with a handle. As the sealing plate deflects, the steel cable moves synchronously, and then the steel cable pulls the sealing plate down to block the discharge port.

[0023] In summary, this utility model has at least one of the following beneficial effects:

[0024] The small balls in the sampling cylinder are stirred by activating the stirring rod, and the rotating rod drives the cam plate to rotate synchronously. As the cam plate rotates, it causes the piston to move up and down. When the piston moves up, it pushes the airflow in the moving chamber into the sampling cylinder, and then blows the small balls through the ejected airflow, so the mixing speed of the small balls is faster.

[0025] When the operator opens the sealing plate, they pull the steel cable and the sealing plate downwards. At this time, the discharge port opens, allowing the operator to pick up the small ball. As the sealing plate moves downwards, it seals the discharge port, thereby reducing the possibility of the small ball being continuously discharged from the discharge port. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0028] Figure 2 This is a partial three-dimensional structural cross-sectional view of the present invention;

[0029] Figure 3 This is a partial three-dimensional unfolded structural cross-sectional view of the present invention;

[0030] Figure 4 This utility model Figure 2 Enlarged view of the structure at point A in the middle.

[0031] Explanation of reference numerals in the attached drawings: 1. Sampling cylinder; 11. Storage chamber; 12. Nozzle; 13. Motor; 2. Stirring rod; 21. Stirring blade; 3. Movable chamber; 4. Piston; 41. Piston disc; 42. Corrugated tube; 43. First spring; 5. Protruding rod disc; 51. Disc; 52. Round rod; 6. Discharge port; 61. Vertical groove; 7. Sealing plate; 71. Second spring; 8. Sealing plate; 81. Handle; 9. Steel cable. Detailed Implementation

[0032] The following is in conjunction with the appendix Figures 1-4 The present invention will be described in further detail below.

[0033] Example 1, refer to Figures 1-4 In this embodiment, to address the problem that existing devices rely solely on an air pump and nozzle to blow air into the first disc to mix the balls, resulting in slow mixing speeds when the balls are mixed only by airflow, this invention discloses a statistical random sampling device.

[0034] It includes a sampling cylinder 1, and a stirring rod 2 is rotatably installed inside the sampling cylinder 1. The small balls inside the sampling cylinder 1 are stirred by activating the stirring rod 2.

[0035] The bottom of the sampling cylinder 1 has a movable cavity 3, which is connected to the inner wall of the sampling cylinder 1. A piston 4 is movably installed in the movable cavity 3. The lower end of the stirring rod 2 is inserted into the movable cavity 3 and a convex rod disk 5 is fixedly fitted thereon. The piston 4 includes a piston disk 41 and a corrugated tube 42. The piston disk 41 is movably installed in the movable cavity 3, and the corrugated tube 42 is fixedly installed on the top surface of the piston disk 41. The top surface of the piston disk 41 is connected to the inner top wall of the movable cavity 3 by a number of first springs 43. The first springs 43 facilitate the upward movement of the piston disk 41 and the corrugated tube 42, thereby ensuring that the corrugated tube 42 is always in contact with the bottom of the convex rod disk 5. As the convex rod disk 5 rotates, it is easy to control the up and down movement of the corrugated tube 42 and the piston disk 41.

[0036] The lower end of the convex rod disk 5 slides against the top surface of the piston component 4. The convex rod disk 5 includes a disk 51 and several round rods 52. The disk 51 is fixedly sleeved on one end of the stirring rod 2 inserted into the movable cavity 3. The upper ends of the several round rods 52 are fixedly set on the bottom surface of the disk 51. The lower ends of the several round rods 52 slide against the top surface of the corrugated tube 42. When the stirring rod 2 rotates, it drives the disk 51 and the round rods 52 to rotate synchronously. Then the round rods 52 slide along the upper end of the corrugated tube 42, thereby causing the corrugated tube 42 to drive the piston disk 41 to move up and down.

[0037] The sampling cylinder 1 has a discharge port 6 on its side wall. A sealing plate 7 is movably inserted into the inner top wall of the discharge port 6. The discharge port 6 is connected to the storage cavity 11. A vertical groove 61 is provided on the inner top wall of the discharge port 6. The sealing plate 7 is installed through the vertical groove 61, and the small balls are discharged through the discharge port 6.

[0038] A sealing plate 8 is hinged at the discharge port 6. The sealing plate 8 is connected to the blocking plate 7 by a steel cable 9. As the sealing plate 8 deflects, the steel cable 9 and the blocking plate 7 move downward. At this time, the discharge port 6 opens, allowing the operator to pick up the small ball. As the blocking plate 7 moves downward, it blocks the discharge port 6, thereby reducing the possibility of the small ball being continuously discharged from the discharge port 6.

[0039] The specific working principle is as follows: the stirring rod 2 is activated to stir the small balls in the sampling cylinder 1. As the stirring rod 2 rotates, it drives the convex rod disk 5 to rotate synchronously. As the convex rod disk 5 rotates, it causes the piston 4 to move up and down. When the piston 4 moves up, it pushes the airflow in the movable chamber 3 into the sampling cylinder 1. Then, the ejected airflow blows the small balls to move, thereby increasing the mixing speed of the small balls.

[0040] Example 2, refer to Figures 1-2 Based on the same concept as in Embodiment 1 above, this statistical random sampling device further includes:

[0041] The sampling cylinder 1 has a storage cavity 11. A nozzle 12 is fixedly inserted into the bottom wall of the storage cavity 11. The air inlet of the nozzle 12 is connected to the movable cavity 3. The storage cavity 11 facilitates the storage of sample balls.

[0042] A motor 13 is fixedly installed at the top of the sampling cylinder 1. The rotating shaft of the motor 13 is fixedly connected to the upper end of the stirring rod 2. Several stirring blades 21 are fixedly installed at one end of the stirring rod 2 inserted into the storage cavity 11. The motor 13 can easily drive the stirring rod 2 and the stirring blades 21 to rotate. As the stirring blades 21 rotate, it is easy to stir and mix the small balls.

[0043] The specific working principle is as follows: when the piston 4 moves upward, it pushes the airflow in the movable chamber 3 into the nozzle 12, and then the airflow ejected from the nozzle 12 blows the ball to move, thereby increasing the mixing speed of the ball.

[0044] Example 3, refer to Figure 4 Based on the same concept as in Embodiment 1 above, this statistical random sampling device further includes:

[0045] The sealing plate 8 is L-shaped, and the sealing plate 7 is movably installed in the vertical groove 61. The upper end of the sealing plate 7 is connected to the inner top wall of the vertical groove 61 by a second spring 71. The second spring 71 facilitates the pulling of the sealing plate 7 upward and into the vertical groove 61, thereby enabling a single ball to enter the discharge port 6.

[0046] A handle 81 is fixedly installed on the side wall of the sealing plate 8. One end of the steel cable 9 is fixedly connected to the side of the sealing plate 8 facing the discharge port 6, and the other end of the steel cable 9 is inserted into the vertical groove 61 and fixedly connected to the top of the sealing plate 8. The handle 81 makes it easy for the operator to pull the sealing plate 8 to open. As the sealing plate 8 deflects, the steel cable 9 moves synchronously. Then, the steel cable 9 pulls the sealing plate 8 down to block the discharge port 6, so as to reduce the possibility of small balls being continuously discharged through the discharge port 6.

[0047] The specific working principle is as follows: as the small balls are continuously stirred and one of them falls into the discharge port 6, the sealing plate 8 is opened. As the sealing plate 8 deflects, it pulls the steel cable 9 and the blocking plate 7 downward. At this time, the discharge port 6 is opened so that the operator can pick up the small ball. As the blocking plate 7 moves downward, it blocks the discharge port 6, thereby reducing the possibility of the small ball being continuously discharged from the discharge port 6.

[0048] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A statistical random sampling device, comprising a sampling tube (1), characterized in that: The sampling cylinder (1) is equipped with a stirring rod (2) that rotates inside. The bottom of the sampling cylinder (1) is provided with a movable cavity (3). The movable cavity (3) is connected to the inner wall of the sampling cylinder (1). A piston (4) is movably arranged in the movable cavity (3). The lower end of the stirring rod (2) is inserted into the movable cavity (3) and a convex rod disc (5) is fixedly fitted thereon. The lower end of the convex rod disc (5) slides against the top surface of the piston (4). The side wall of the sampling cylinder (1) is provided with a discharge port (6). A sealing plate (7) is movably inserted into the inner top wall of the discharge port (6). A sealing plate (8) is hinged at the outlet of the discharge port (6). The sealing plate (8) is connected to the sealing plate (7) by a steel cable (9).

2. The statistical random sampling device according to claim 1, characterized in that: The sampling tube (1) has a storage cavity (11) inside, and a nozzle (12) is fixedly inserted into the inner bottom wall of the storage cavity (11). The air inlet end of the nozzle (12) is connected to the movable cavity (3).

3. The statistical random sampling device according to claim 2, characterized in that: A motor (13) is fixedly installed on the top of the sampling tube (1). The rotating shaft of the motor (13) is fixedly connected to the upper end of the stirring rod (2). A number of stirring blades (21) are fixedly installed on one end of the stirring rod (2) inserted into the storage cavity (11).

4. The statistical random sampling device according to claim 1, characterized in that: The piston component (4) includes a piston disc (41) and a corrugated tube (42). The piston disc (41) is movably disposed in the movable cavity (3). The corrugated tube (42) is fixedly disposed on the top surface of the piston disc (41). The top surface of the piston disc (41) is connected to the inner top wall of the movable cavity (3) by a plurality of first springs (43).

5. The statistical random sampling device according to claim 4, characterized in that: The convex rod disk (5) includes a disk (51) and several round rods (52). The disk (51) is fixedly sleeved on one end of the stirring rod (2) inserted into the movable cavity (3). The upper ends of the several round rods (52) are fixedly set on the bottom surface of the disk (51), and the lower ends of the several round rods (52) slide against the top surface of the corrugated tube (42).

6. The statistical random sampling device according to claim 1, characterized in that: The discharge port (6) is connected to the storage cavity (11), and the inner top wall of the discharge port (6) is provided with a vertical groove (61).

7. The statistical random sampling device according to claim 6, characterized in that: The sealing plate (8) is L-shaped, and the sealing plate (7) is movably disposed in the vertical groove (61). The upper end of the sealing plate (7) is connected to the inner top wall of the vertical groove (61) by a second spring (71).

8. The statistical random sampling device according to claim 7, characterized in that: A handle (81) is fixedly provided on the side wall of the sealing plate (8). One end of the steel cable (9) is fixedly connected to the side of the sealing plate (8) facing the discharge port (6). The other end of the steel cable (9) is inserted into the vertical groove (61) and fixedly connected to the top of the sealing plate (8).

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